Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602165
Jiexuan Wu, Wentian Lu, Mingbo Liu
This paper investigates the distributed security constrained economic dispatch (SCED) problem in an active distribution network, pursuing the minimization of generation cost of the entire system considering network security and generation limit constraints. A feedback strategy derived from the duality-based method is proposed to achieve the distributed solution of SCED. In the proposed strategy, the distribution management system (DMS) and microgenerators (MGs) are regarded as intelligent agents in charge of fast calculation and measurement. The variation of system demand results in fluctuations on branch flows, which can be measured by DMS and then transmitted to MGs. Each MG can adjust itself active power output independently so as to respond to system demand variation, and meanwhile ensure network security. The proposed method only requires partial dual variable information transfer from the DMS agent to MG agents, and has plug-and-play features. Simulations of the IEEE 33-bus system are provided to illustrate the performance and robustness of the proposed algorithm.
{"title":"Online Distributed Security Constrained Economic Dispatch for Active Distribution Networks Based on Feedback Strategy","authors":"Jiexuan Wu, Wentian Lu, Mingbo Liu","doi":"10.1109/POWERCON.2018.8602165","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602165","url":null,"abstract":"This paper investigates the distributed security constrained economic dispatch (SCED) problem in an active distribution network, pursuing the minimization of generation cost of the entire system considering network security and generation limit constraints. A feedback strategy derived from the duality-based method is proposed to achieve the distributed solution of SCED. In the proposed strategy, the distribution management system (DMS) and microgenerators (MGs) are regarded as intelligent agents in charge of fast calculation and measurement. The variation of system demand results in fluctuations on branch flows, which can be measured by DMS and then transmitted to MGs. Each MG can adjust itself active power output independently so as to respond to system demand variation, and meanwhile ensure network security. The proposed method only requires partial dual variable information transfer from the DMS agent to MG agents, and has plug-and-play features. Simulations of the IEEE 33-bus system are provided to illustrate the performance and robustness of the proposed algorithm.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130486107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602191
Jun Suo, Tong Wang, Jun Deng, Junchen Li, Haijing Zhang, Yanli Zhang, Jiuliang Liu
An adaptive sub-synchronous resonance (SSR) damping controller using Kalman filters are proposed for AC/DC hybrid system with high penetration wind in this paper. First, the supplementary damping coordinated controller of DFIG and HVDC are designed using multiple input multiple output LMIs. Then the adaptive method using Kalman online estimations for tracking the operating points caused by the variable wind power output. The AC/DC hybrid system integration with wind power generation is used as test system. The characteristic of variable SSR modes with wind power outputs is investigated, and the simulation results demonstrated that the adaptive SSR damping control method could not only track the operating condition, but also could give robust and effective control in the case of large fluctuation of wind power output.
{"title":"Adaptive Sub-synchronous Resonance Damping Controller for AC/DC Hybrid Power System with High Penetration Wind Power","authors":"Jun Suo, Tong Wang, Jun Deng, Junchen Li, Haijing Zhang, Yanli Zhang, Jiuliang Liu","doi":"10.1109/POWERCON.2018.8602191","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602191","url":null,"abstract":"An adaptive sub-synchronous resonance (SSR) damping controller using Kalman filters are proposed for AC/DC hybrid system with high penetration wind in this paper. First, the supplementary damping coordinated controller of DFIG and HVDC are designed using multiple input multiple output LMIs. Then the adaptive method using Kalman online estimations for tracking the operating points caused by the variable wind power output. The AC/DC hybrid system integration with wind power generation is used as test system. The characteristic of variable SSR modes with wind power outputs is investigated, and the simulation results demonstrated that the adaptive SSR damping control method could not only track the operating condition, but also could give robust and effective control in the case of large fluctuation of wind power output.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127876397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602336
Yufei Teng, Xing Zhang, Chengwei Fan, Xujiang Chen, Ran Zhang
Due to the long transmission line and low level of load, the resonance is of severity in the infirm-interconnected grid with power electronic components. This paper uses modal analysis method to analyze the resonance risk of infirm-interconnected grid considering photovoltaic power generation devices (PV). Firstly, the harmonic model of PV, as well as the transmission line, transformer, is established. Meanwhile, in order to reduce the complexity of eigenvalue computation, the harmonic modal impedance of main grid is transformed to that of PCC node connecting the infirm interconnected grid by Gauss elimination. Then a practical infirm interconnected grid in western China is used as the case study and modal analysis is utilized to study the resonance risk. The result indicates that the L-C-L filter of PV would be the main factors affecting the resonance point.
{"title":"Resonance Risk in Infirm-interconnected Grid Considering Photovoltaic Devices","authors":"Yufei Teng, Xing Zhang, Chengwei Fan, Xujiang Chen, Ran Zhang","doi":"10.1109/POWERCON.2018.8602336","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602336","url":null,"abstract":"Due to the long transmission line and low level of load, the resonance is of severity in the infirm-interconnected grid with power electronic components. This paper uses modal analysis method to analyze the resonance risk of infirm-interconnected grid considering photovoltaic power generation devices (PV). Firstly, the harmonic model of PV, as well as the transmission line, transformer, is established. Meanwhile, in order to reduce the complexity of eigenvalue computation, the harmonic modal impedance of main grid is transformed to that of PCC node connecting the infirm interconnected grid by Gauss elimination. Then a practical infirm interconnected grid in western China is used as the case study and modal analysis is utilized to study the resonance risk. The result indicates that the L-C-L filter of PV would be the main factors affecting the resonance point.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129187793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602068
Li Li, L. Zhong, X. Duan, Meng Song, Zhengjun Shi, N. Hu, Wenfeng Cheng, Y. Luo, Youxin Lin
This paper mainly studies the heat transfer characteristics of stainless steel wrapped YBCO strip in the resistance superconducting current limiter under liquid nitrogen, and provides theoretical basis for the design and manufacture of superconducting current limiter through the study and comparative analysis of its electrical and thermal properties under out-of-state state.Based on the experiment, the characteristic curve of superconducting strip itself is established. On this basis, the temperature distribution of epoxy curing coil and non-epoxy curing coil in liquid nitrogen with different heat transfer coefficients and impact current is studied. For the superconducting strip without epoxy curing, the loss of superconductivity instantly generates a large amount of heat to conduct outwards. If the coil is directly in contact with liquid nitrogen, it will produce boiling phenomenon and quickly produce a large amount of gas. For different currents, the superconducting strip will eventually reach thermal equilibrium at different temperatures. The higher the current, the higher the thermal equilibrium temperature. Through simulation analysis, the current is controlled at 5 times Ic, the superconducting strip surface is in the state of nuclear boiling, and the temperature transfer is faster. The energy efficiency of the high-temperature superconducting coil cured by epoxy can limit the heat output, the heat conduction rate decreases, the coil cooling rate is slow, and the temperature difference between the surface of epoxy-liquid nitrogen decreases, and the boiling phenomenon is restrained to some extent. In this process, the heat transfer is less, which can be approximated as an adiabatic process, but the coil's tolerance time is only about 0.15s, beyond this time, the coil temperature is too high and easy to burn. In epoxy curing coil, different epoxy layer thickness has a great impact on subsequent quench recovery time. The epoxy layer thickness increases from 0.01mm to 0.2mm, and the time rapidly increases from 0.5s to 3s. If epoxy is used for curing, if the system does not consider the recovery time, epoxy can be used as thermal buffering material, but if the heat is generated too fast to be released, and the temperature exceeds the bearing limit of epoxy and strip, the strip will be damaged.As the performance of the current superconducting strip is fragile, it is a bottleneck problem in the current limiter. In order to protect the superconducting strip, in the design and manufacture of the current limiter, the scheme without epoxy curing coil is preferred.
{"title":"Study on heat transfer characteristics of stainless steel wrapped YBCO strip under liquid nitrogen","authors":"Li Li, L. Zhong, X. Duan, Meng Song, Zhengjun Shi, N. Hu, Wenfeng Cheng, Y. Luo, Youxin Lin","doi":"10.1109/POWERCON.2018.8602068","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602068","url":null,"abstract":"This paper mainly studies the heat transfer characteristics of stainless steel wrapped YBCO strip in the resistance superconducting current limiter under liquid nitrogen, and provides theoretical basis for the design and manufacture of superconducting current limiter through the study and comparative analysis of its electrical and thermal properties under out-of-state state.Based on the experiment, the characteristic curve of superconducting strip itself is established. On this basis, the temperature distribution of epoxy curing coil and non-epoxy curing coil in liquid nitrogen with different heat transfer coefficients and impact current is studied. For the superconducting strip without epoxy curing, the loss of superconductivity instantly generates a large amount of heat to conduct outwards. If the coil is directly in contact with liquid nitrogen, it will produce boiling phenomenon and quickly produce a large amount of gas. For different currents, the superconducting strip will eventually reach thermal equilibrium at different temperatures. The higher the current, the higher the thermal equilibrium temperature. Through simulation analysis, the current is controlled at 5 times Ic, the superconducting strip surface is in the state of nuclear boiling, and the temperature transfer is faster. The energy efficiency of the high-temperature superconducting coil cured by epoxy can limit the heat output, the heat conduction rate decreases, the coil cooling rate is slow, and the temperature difference between the surface of epoxy-liquid nitrogen decreases, and the boiling phenomenon is restrained to some extent. In this process, the heat transfer is less, which can be approximated as an adiabatic process, but the coil's tolerance time is only about 0.15s, beyond this time, the coil temperature is too high and easy to burn. In epoxy curing coil, different epoxy layer thickness has a great impact on subsequent quench recovery time. The epoxy layer thickness increases from 0.01mm to 0.2mm, and the time rapidly increases from 0.5s to 3s. If epoxy is used for curing, if the system does not consider the recovery time, epoxy can be used as thermal buffering material, but if the heat is generated too fast to be released, and the temperature exceeds the bearing limit of epoxy and strip, the strip will be damaged.As the performance of the current superconducting strip is fragile, it is a bottleneck problem in the current limiter. In order to protect the superconducting strip, in the design and manufacture of the current limiter, the scheme without epoxy curing coil is preferred.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125381662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8601767
L. Zhichao, Wei Yuanqing, Luo Busheng, Liu Xuan, Yan Haipeng
To make D-STATCOM adapt to the distribution network with fluctuant distribution generators (DG), this paper studies the relationship between reactive power, DG and target voltage of D-STATCOM by establishing the model of the distribution network equipped with D-STATCOM, which also has fluctuation DG accessed. Then, based on the voltage adjustment coefficient, the reactive power-voltage hysteresis operation strategy of D-STATCOM is proposed and the switching condition between different operating modes is given. Finally, based on the random DG output data, the effectiveness of the proposed strategy is verified. The results show that the D-STATCOM hysteresis strategy can effectively reduce the variability of reactive power and voltage when the distribution network operating status changes randomly, in improving the reactive power margin of DSTATCOM, but also reduce network loss.
{"title":"Hysteretic Strategy of D-STATCOM Adapting to the Distribution Network with Fluctuant DG","authors":"L. Zhichao, Wei Yuanqing, Luo Busheng, Liu Xuan, Yan Haipeng","doi":"10.1109/POWERCON.2018.8601767","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8601767","url":null,"abstract":"To make D-STATCOM adapt to the distribution network with fluctuant distribution generators (DG), this paper studies the relationship between reactive power, DG and target voltage of D-STATCOM by establishing the model of the distribution network equipped with D-STATCOM, which also has fluctuation DG accessed. Then, based on the voltage adjustment coefficient, the reactive power-voltage hysteresis operation strategy of D-STATCOM is proposed and the switching condition between different operating modes is given. Finally, based on the random DG output data, the effectiveness of the proposed strategy is verified. The results show that the D-STATCOM hysteresis strategy can effectively reduce the variability of reactive power and voltage when the distribution network operating status changes randomly, in improving the reactive power margin of DSTATCOM, but also reduce network loss.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125423826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to improve the accuracy of power transformers, a new DGA ratios based on support vector machine (SVM) and quantum-behaved particle swarm optimization with binary encoding (BQPSO) algorithm was proposed in the paper. First of all, 28 DGA ratios are used as the input vectors. Then, the SVM parameters and DGA ratios were simultaneously optimized by BQPSO. Finally, a transformer fault diagnosis model based on the artificial bee colony (ABC) algorithm optimization SVM combined with the cross validation (CV) principle is used to diagnostic fault. The diagnosis results show that the proposed DGA ratios increase the accuracy by 12%-28% over IEC ratios and DGA data. Furthermore, the accuracy of ABCSVM is better than the GASVM and standard SVM (accuracy rate are 84.35% 79.33%% and 65.41%).
{"title":"Transformer fault diagnosis based on new features selection and artificial bee colony optimization SVM","authors":"Yiyi Zhang, Hongbo Peng, Jiake Fang, Liuliang Zhao, Xin Li, Changyi Liao","doi":"10.1109/POWERCON.2018.8602231","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602231","url":null,"abstract":"In order to improve the accuracy of power transformers, a new DGA ratios based on support vector machine (SVM) and quantum-behaved particle swarm optimization with binary encoding (BQPSO) algorithm was proposed in the paper. First of all, 28 DGA ratios are used as the input vectors. Then, the SVM parameters and DGA ratios were simultaneously optimized by BQPSO. Finally, a transformer fault diagnosis model based on the artificial bee colony (ABC) algorithm optimization SVM combined with the cross validation (CV) principle is used to diagnostic fault. The diagnosis results show that the proposed DGA ratios increase the accuracy by 12%-28% over IEC ratios and DGA data. Furthermore, the accuracy of ABCSVM is better than the GASVM and standard SVM (accuracy rate are 84.35% 79.33%% and 65.41%).","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125500659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602099
He Lei, Ji Zhang, Z. Sang, Z. Du, Hui Zhang, R. Fang, Jiong Yan, Qiushi Xu, Jingyou Xu, Ya-lei Wang, Jiankun Yin, Lei Wu
Dynamic voltage restorers have been examined to compensate voltage sags in distribution networks to avoid production losses, especially in the Premium Power Park(PPP). If the compensation strategy can be optimized to extend the compensation time as long as possible, then the application of DVR in power system can be more popular, and the intelligent level of the power grid can also be effectively improved. As a result, this paper proposed a time-maximized compensation strategy to achieve a maximum compensation time based on the energy-minimized compensation strategy. According to the formula of dc-link discharge, the calculating formula of optimum phase angle jump of load voltage is deduced, and the principle and characteristic of the compensation strategy are analyzed respectively for single-phase and three-phase system. Simulation and experimental results are presented to confirm the effectiveness of the proposed compensation strategy.
{"title":"Voltage sag compensation with dynamic voltage restorer by the time-maximized strategy","authors":"He Lei, Ji Zhang, Z. Sang, Z. Du, Hui Zhang, R. Fang, Jiong Yan, Qiushi Xu, Jingyou Xu, Ya-lei Wang, Jiankun Yin, Lei Wu","doi":"10.1109/POWERCON.2018.8602099","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602099","url":null,"abstract":"Dynamic voltage restorers have been examined to compensate voltage sags in distribution networks to avoid production losses, especially in the Premium Power Park(PPP). If the compensation strategy can be optimized to extend the compensation time as long as possible, then the application of DVR in power system can be more popular, and the intelligent level of the power grid can also be effectively improved. As a result, this paper proposed a time-maximized compensation strategy to achieve a maximum compensation time based on the energy-minimized compensation strategy. According to the formula of dc-link discharge, the calculating formula of optimum phase angle jump of load voltage is deduced, and the principle and characteristic of the compensation strategy are analyzed respectively for single-phase and three-phase system. Simulation and experimental results are presented to confirm the effectiveness of the proposed compensation strategy.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126873815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8601734
Tong Zhang, Zhigang Li, Q. Wu, Xiaoxin Zhou
This paper presents an iterative approach to jointly estimate the states in combined heat and power systems (CHPS). The node method is used to address the temperature quasi-dynamics in the district heating system (DHS), resulting in a dynamic state estimation (DSE) model. An alternating estimation strategy is employed to effectively handle the complicated time-delay constraints of temperature in the computation of DSE. Case studies are conducted on two CHPS test systems to verify the effectiveness of the DSE and the alternating approach. Simulation results show that the DSE in CHPS outperforms the static state estimation and the separate state estimation in individual energy systems in terms of accuracy.
{"title":"Dynamic State Estimation of Combined Heat and Power System Considering Quasi-Dynamics of Temperature in Pipelines","authors":"Tong Zhang, Zhigang Li, Q. Wu, Xiaoxin Zhou","doi":"10.1109/POWERCON.2018.8601734","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8601734","url":null,"abstract":"This paper presents an iterative approach to jointly estimate the states in combined heat and power systems (CHPS). The node method is used to address the temperature quasi-dynamics in the district heating system (DHS), resulting in a dynamic state estimation (DSE) model. An alternating estimation strategy is employed to effectively handle the complicated time-delay constraints of temperature in the computation of DSE. Case studies are conducted on two CHPS test systems to verify the effectiveness of the DSE and the alternating approach. Simulation results show that the DSE in CHPS outperforms the static state estimation and the separate state estimation in individual energy systems in terms of accuracy.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123334468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8601975
Y. Da-hai, Yuan Xiu-yue, Nian Ming, Su Yi, Tao Xiang-Yu, Xu Zhen-hua, Huo Chengxiang
Due to the increase of the proportion of nuclear power unit capacity in the power grid, the simulation analysis of the PWR nuclear power unit is increasingly important for power grid stability analysis, which is regarded as one of the important parts of China’s nuclear power unit. The original mathematical model of the PWR nuclear power unit is very complex and not suitable for the stable calculation and actual measurement modeling of the power grid. Based on the actual modeling of conventional islands, a simplified simulation model of the nuclear island is proposed in this paper and is conducted the actual modeling test of nuclear islands and conventional islands at the NINGDE Nuclear Power Station and FUQING Nuclear Power Station in Fujian Province. In the load test, the models and parameters of the nuclear reactor control system, temperature control circuit, steam generator, speed control system, actuator, and steam turbine were measured. The nuclear island uses the mathematical model built by MATLAB in conjunction with PSD-BPA software for simulation verification. The simulation results can truly reflect the dynamic characteristics of the nuclear islands and conventional islands of PWR nuclear power units, providing mathematical models and parameters for grid stability calculations, which can be used for dispatching safety and stability calculations.
{"title":"Study on Nuclear Island Modeling and Parameter Measurement of Medium Pressure in Power Grid Stability Calculation","authors":"Y. Da-hai, Yuan Xiu-yue, Nian Ming, Su Yi, Tao Xiang-Yu, Xu Zhen-hua, Huo Chengxiang","doi":"10.1109/POWERCON.2018.8601975","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8601975","url":null,"abstract":"Due to the increase of the proportion of nuclear power unit capacity in the power grid, the simulation analysis of the PWR nuclear power unit is increasingly important for power grid stability analysis, which is regarded as one of the important parts of China’s nuclear power unit. The original mathematical model of the PWR nuclear power unit is very complex and not suitable for the stable calculation and actual measurement modeling of the power grid. Based on the actual modeling of conventional islands, a simplified simulation model of the nuclear island is proposed in this paper and is conducted the actual modeling test of nuclear islands and conventional islands at the NINGDE Nuclear Power Station and FUQING Nuclear Power Station in Fujian Province. In the load test, the models and parameters of the nuclear reactor control system, temperature control circuit, steam generator, speed control system, actuator, and steam turbine were measured. The nuclear island uses the mathematical model built by MATLAB in conjunction with PSD-BPA software for simulation verification. The simulation results can truly reflect the dynamic characteristics of the nuclear islands and conventional islands of PWR nuclear power units, providing mathematical models and parameters for grid stability calculations, which can be used for dispatching safety and stability calculations.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126234379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-01DOI: 10.1109/POWERCON.2018.8602061
R. Zhong, Yufei Teng, Xiaoru Wang, Yuzhao Zhu, Han Zhang
The AC-DC hybrid distribution network provides DC interfaces for electric vehicle charging stations, photovoltaic power stations, battery storage, and reduces redundant power conversion links and energy loss. The incorporating of the active DC distribution network into AC grid has added complexity into the optimal power flow problem, yet the intermittence of PV output and the randomness of electric vehicles loads lead to a significant increase in the uncertainty and complexity of AC-DC hybrid power system. At present, the study of optimal power flow (OPF) for AC/DC systems containing DC distribution network is still in its infancy and none of them have taken the uncertainties of PV power generation and EV loads into account. This paper firstly establishes the DC grid connected power function for photovoltaic power and electric vehicles by Monte Carlo simulation; secondly the power functions are used to build a probabilistic optimal power flow (POPF) model for an AC/DC hybrid distribution network case consisting of voltage source converters (VSC), DC distribution network and traditional AC network. At last the three-point estimation method (3PEM) using the center distance information of random variables is applied based on existing deterministic optimal power flow algorithm in order to realize the POPF calculation. The results show that the mathematical model and 3PEM used in this paper can take the uncertainties of photovoltaic power generation and electric vehicle load into consideration effectively on the basis of traditional static power flow optimization and the results obtained are of high accuracy and low computational burden. The obtained POPF results reflect more actual operation status of the power grid than static optimal power flow results so it could be used as the planning and operation theoretical basis of AC/DC hybrid distribution network and it could be a useful reference for the further development of electric vehicles.
{"title":"Probabilistic Optimal Power Flow Calculation of AC/DC Hybrid Distribution Network with Photovoltaic Power and Electric Vehicles","authors":"R. Zhong, Yufei Teng, Xiaoru Wang, Yuzhao Zhu, Han Zhang","doi":"10.1109/POWERCON.2018.8602061","DOIUrl":"https://doi.org/10.1109/POWERCON.2018.8602061","url":null,"abstract":"The AC-DC hybrid distribution network provides DC interfaces for electric vehicle charging stations, photovoltaic power stations, battery storage, and reduces redundant power conversion links and energy loss. The incorporating of the active DC distribution network into AC grid has added complexity into the optimal power flow problem, yet the intermittence of PV output and the randomness of electric vehicles loads lead to a significant increase in the uncertainty and complexity of AC-DC hybrid power system. At present, the study of optimal power flow (OPF) for AC/DC systems containing DC distribution network is still in its infancy and none of them have taken the uncertainties of PV power generation and EV loads into account. This paper firstly establishes the DC grid connected power function for photovoltaic power and electric vehicles by Monte Carlo simulation; secondly the power functions are used to build a probabilistic optimal power flow (POPF) model for an AC/DC hybrid distribution network case consisting of voltage source converters (VSC), DC distribution network and traditional AC network. At last the three-point estimation method (3PEM) using the center distance information of random variables is applied based on existing deterministic optimal power flow algorithm in order to realize the POPF calculation. The results show that the mathematical model and 3PEM used in this paper can take the uncertainties of photovoltaic power generation and electric vehicle load into consideration effectively on the basis of traditional static power flow optimization and the results obtained are of high accuracy and low computational burden. The obtained POPF results reflect more actual operation status of the power grid than static optimal power flow results so it could be used as the planning and operation theoretical basis of AC/DC hybrid distribution network and it could be a useful reference for the further development of electric vehicles.","PeriodicalId":260947,"journal":{"name":"2018 International Conference on Power System Technology (POWERCON)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126430949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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