Pub Date : 2018-12-01DOI: 10.1109/SPEC.2018.8635879
Fangqing Li, F. Gao
Modular multilevel converter (MMC) is regarded as the most competitive solution for high-voltage direct current (HVDC) transmission using voltage source converters (VSCs). Circulating current suppressing strategies based on proportional resonant (PR) controllers are widely used in MMC. Although this kind of strategies can effectively eliminate all the circulating current components in MMC-HVDC, it will result in dc-line voltage ripples under unbalanced grid conditions and thus deteriorates system performance and stability. To solve this problem, this paper develops and analyzes the model of the dc voltage fluctuation of MMC under imbalanced grid voltage accurately and proposes an optimized circulating current control method. Compared with the traditional circulating current suppressing control based on PR controller, the optimized circulating current control method which reduces the double frequency ripples of dc voltage. Simulations in PSCAD/EMTDC verify the effectiveness of the proposed control strategy.
{"title":"Reducing DC Voltage Ripples of MMC by Injecting Circulating Current under Imbalanced Grid Conditions","authors":"Fangqing Li, F. Gao","doi":"10.1109/SPEC.2018.8635879","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635879","url":null,"abstract":"Modular multilevel converter (MMC) is regarded as the most competitive solution for high-voltage direct current (HVDC) transmission using voltage source converters (VSCs). Circulating current suppressing strategies based on proportional resonant (PR) controllers are widely used in MMC. Although this kind of strategies can effectively eliminate all the circulating current components in MMC-HVDC, it will result in dc-line voltage ripples under unbalanced grid conditions and thus deteriorates system performance and stability. To solve this problem, this paper develops and analyzes the model of the dc voltage fluctuation of MMC under imbalanced grid voltage accurately and proposes an optimized circulating current control method. Compared with the traditional circulating current suppressing control based on PR controller, the optimized circulating current control method which reduces the double frequency ripples of dc voltage. Simulations in PSCAD/EMTDC verify the effectiveness of the proposed control strategy.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127980065","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636028
Gongke Wang, F. Gao, Fangqing Li
This paper proposes a synchronized reactive power variation (RPV) method for islanding detection in multi-inverter based distributed generation (DG) systems. The proposed method utilizes a high-frequency signal injection for synchronization, and therefore, additional communication components are not needed. The reactive power varies periodically under the condition that the high frequency signal is detected as expected. Once the detection time of the high frequency voltage is out of predesigned range, the RPV activation time will be changed to guarantee the synchronization. As RPVs of parallel-connected inverters are synchronized, the proposed method can work effectively in multi-inverter DGs. Simulation studies are carried out to verify the effectiveness of the proposed islanding detection method in multi-inverter based system.
{"title":"Synchronized Reactive Power Variation Method for Islanding Detection Using High-Frequency Signal Injection","authors":"Gongke Wang, F. Gao, Fangqing Li","doi":"10.1109/SPEC.2018.8636028","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636028","url":null,"abstract":"This paper proposes a synchronized reactive power variation (RPV) method for islanding detection in multi-inverter based distributed generation (DG) systems. The proposed method utilizes a high-frequency signal injection for synchronization, and therefore, additional communication components are not needed. The reactive power varies periodically under the condition that the high frequency signal is detected as expected. Once the detection time of the high frequency voltage is out of predesigned range, the RPV activation time will be changed to guarantee the synchronization. As RPVs of parallel-connected inverters are synchronized, the proposed method can work effectively in multi-inverter DGs. Simulation studies are carried out to verify the effectiveness of the proposed islanding detection method in multi-inverter based system.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130614175","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635973
Guihua Liu, Wen-xia Wang, Wei Wang, Kai Zhu
For the conventional two-stage grid-connected photovoltaic (PV) inverter, the second stage usually adopts the voltage-current double closed-loop control. When the output power of PV panels changes, it is necessary to change the voltage of DC bus to change the energy output of the second stage. However, limited by the bandwidth of the outer voltage loop in the second stage, the dynamic response speed of the system is not ideal. Scheming for this problem, according to the characteristics of two-stage grid-connected PV inverter, the double closed-loop control containing outer voltage loop and passivity-based inner current loop is adopted and the power feedforward control is added to this structure. That is, add the output power of PV panels in the first stage as a feedforward to the inner current loop in the second stage. Therefore, the reference value of the inner current loop is composed of the output of both the outer voltage loop and the power feedforward loop. Simulation and experimental results show that the proposed method can effectively improve the dynamic response speed of the second stage to the power changes in first stage and shorten the transient response process. Besides, the power feedforward control can reduce the steady-state error and the overshoot of DC-bus voltage while improving the robustness of the system.
{"title":"Power Feedforward Method for Passivity-based Gridconnected PV Inverter in Weak Grids","authors":"Guihua Liu, Wen-xia Wang, Wei Wang, Kai Zhu","doi":"10.1109/SPEC.2018.8635973","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635973","url":null,"abstract":"For the conventional two-stage grid-connected photovoltaic (PV) inverter, the second stage usually adopts the voltage-current double closed-loop control. When the output power of PV panels changes, it is necessary to change the voltage of DC bus to change the energy output of the second stage. However, limited by the bandwidth of the outer voltage loop in the second stage, the dynamic response speed of the system is not ideal. Scheming for this problem, according to the characteristics of two-stage grid-connected PV inverter, the double closed-loop control containing outer voltage loop and passivity-based inner current loop is adopted and the power feedforward control is added to this structure. That is, add the output power of PV panels in the first stage as a feedforward to the inner current loop in the second stage. Therefore, the reference value of the inner current loop is composed of the output of both the outer voltage loop and the power feedforward loop. Simulation and experimental results show that the proposed method can effectively improve the dynamic response speed of the second stage to the power changes in first stage and shorten the transient response process. Besides, the power feedforward control can reduce the steady-state error and the overshoot of DC-bus voltage while improving the robustness of the system.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122542851","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635901
Wendong Feng, Jian Yang, Zhangjie Liu, Hui Wang, M. Su, Xin Zhang
This paper presents a unified distributed control scheme for hybrid AC/DC microgrid to realize the economic operation of system. The existing researches on distributed optimization are purely focused on the DC or AC microgrid environment, and the research on the economic optimization of hybrid microgrid containing AC and DC subgrid has not been further studied. In this paper, a unified distributed optimization strategy for hybrid microgrid based on the equal incremental cost(IC) principle is proposed. The control strategy proposed in this paper can be divided into two parts. For the first part, ICs of the sources reach consensus through the distributed protocol in a single AC subgrid or DC subgrid, and the average voltage recovery is achieved by building a voltage observer in every source. For the second part, by using PI controller, the reference power of the bidirectional dc-ac interlinking converter is easily defined and the global incremental costs are finally equalized according to the respective distributed protocols. Thus the generation cost is optimized. Feasibility and effectiveness of proposed method are verified by simulation in Matlab/Simulink environment.
{"title":"A unified distributed control scheme on cost optimization for hybrid AC/DC microgrid","authors":"Wendong Feng, Jian Yang, Zhangjie Liu, Hui Wang, M. Su, Xin Zhang","doi":"10.1109/SPEC.2018.8635901","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635901","url":null,"abstract":"This paper presents a unified distributed control scheme for hybrid AC/DC microgrid to realize the economic operation of system. The existing researches on distributed optimization are purely focused on the DC or AC microgrid environment, and the research on the economic optimization of hybrid microgrid containing AC and DC subgrid has not been further studied. In this paper, a unified distributed optimization strategy for hybrid microgrid based on the equal incremental cost(IC) principle is proposed. The control strategy proposed in this paper can be divided into two parts. For the first part, ICs of the sources reach consensus through the distributed protocol in a single AC subgrid or DC subgrid, and the average voltage recovery is achieved by building a voltage observer in every source. For the second part, by using PI controller, the reference power of the bidirectional dc-ac interlinking converter is easily defined and the global incremental costs are finally equalized according to the respective distributed protocols. Thus the generation cost is optimized. Feasibility and effectiveness of proposed method are verified by simulation in Matlab/Simulink environment.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117254736","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635952
Xiaohai Ge, Hua Han, Wenbin Yuan, Yao Sun, M. Su, Xin Zhang, Koh Leong Hai
This paper presents an integrated series-parallel microgrid(MG), where a few distributed generation(DG) units in series type are used to form a DG string, then DG strings supply power to the common load in parallel type. With this structure, low-voltage devices could be integrated into MG without DC-DC boost converters. It provides a more flexible and efficient way to form higher voltage level MG. But it is difficult to find a decentralized control method to achieve power balance for this integrated system because of the difference between power transmission characteristics of parallel and series converter system. For this proposed MG in island mode, a unified distributed control strategy is proposed. With low bandwidth communication, accurate power sharing can be realized by exchanging information between the first converters connected to the bus of adjacent DG strings and between adjacent converters inside each DG string. Because the central controller is not used, the communication pressure of the system is reduced and the reliability is guaranteed. Simulation test has verified the feasibility and validity of the proposed control strategy.
{"title":"An Integrated Series-Parallel Microgrid Structure and its Unified Distributed Control","authors":"Xiaohai Ge, Hua Han, Wenbin Yuan, Yao Sun, M. Su, Xin Zhang, Koh Leong Hai","doi":"10.1109/SPEC.2018.8635952","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635952","url":null,"abstract":"This paper presents an integrated series-parallel microgrid(MG), where a few distributed generation(DG) units in series type are used to form a DG string, then DG strings supply power to the common load in parallel type. With this structure, low-voltage devices could be integrated into MG without DC-DC boost converters. It provides a more flexible and efficient way to form higher voltage level MG. But it is difficult to find a decentralized control method to achieve power balance for this integrated system because of the difference between power transmission characteristics of parallel and series converter system. For this proposed MG in island mode, a unified distributed control strategy is proposed. With low bandwidth communication, accurate power sharing can be realized by exchanging information between the first converters connected to the bus of adjacent DG strings and between adjacent converters inside each DG string. Because the central controller is not used, the communication pressure of the system is reduced and the reliability is guaranteed. Simulation test has verified the feasibility and validity of the proposed control strategy.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115556596","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636091
A. Ghias, P. Acuña, Jinghang Lu, A. Merabet
The flying capacitors (FCs) of the nested neutral-point-clamped (NNPC) converter show an inherent voltage ripple at the fundamental frequency. This ripple can be significantly large under some operating conditions of the converter and hence can affect the performance. In this paper, a modified NNPC is proposed, so called active NNPC (ANNPC) converter. Like other multilevel converters, ANNPC also required capacitor voltage balancing, therefore finite control set model predictive control (FCS-MPC) scheme is proposed to control such objective. A mathematical model is developed to be used in the FCS-MPC. The performance of the ANNPC is compared with the NNPC in terms of capacitor voltage ripples and the total harmonics distortion of the output voltage and current. The results are validated by simulations.
{"title":"Finite Control Set Model Predictive Control of an Active Nested Neutral-Point-Clamped Converter","authors":"A. Ghias, P. Acuña, Jinghang Lu, A. Merabet","doi":"10.1109/SPEC.2018.8636091","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636091","url":null,"abstract":"The flying capacitors (FCs) of the nested neutral-point-clamped (NNPC) converter show an inherent voltage ripple at the fundamental frequency. This ripple can be significantly large under some operating conditions of the converter and hence can affect the performance. In this paper, a modified NNPC is proposed, so called active NNPC (ANNPC) converter. Like other multilevel converters, ANNPC also required capacitor voltage balancing, therefore finite control set model predictive control (FCS-MPC) scheme is proposed to control such objective. A mathematical model is developed to be used in the FCS-MPC. The performance of the ANNPC is compared with the NNPC in terms of capacitor voltage ripples and the total harmonics distortion of the output voltage and current. The results are validated by simulations.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114594422","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636065
Pei Cai, Xiaohua Wu, Yongheng Yang, W. Yao, Wenjie Liu, F. Blaabjerg
Damping is required in grid-connected LCL-filtered inverters. Due to additional power losses caused by passive elements, active damping is more favorable. As an active damping solution, the single-loop filter-based damping, being directly plugged into the current controller, features no extra sensors and simplicity, and thus it has drawn much attention in LCL-filtered inverters. However, the existing filter-based damping is not very satisfactory because of limited frequency characteristics. For example, the notch filter designed for a low LCL-resonance frequency does not function well for a high resonance frequency owing to its overmuch phase lead, which means that one filter is not sufficient to cover all possible LCL resonance frequencies caused by parameter drifts, indicating unnecessary repetitive designs and poor universality. Thus, this paper proposes a notch-like digital filter-based single-loop active damping method, which covers a wide range of frequencies up to the Nyquist frequency. That is, the proposed is robust against LCL filter parameter drifts and grid impedance variations. Simulation results verify the proposed method.
{"title":"Design of Digital Filter-based Highly Robust Active Damping for LCL-filtered Grid-tied Inverters","authors":"Pei Cai, Xiaohua Wu, Yongheng Yang, W. Yao, Wenjie Liu, F. Blaabjerg","doi":"10.1109/SPEC.2018.8636065","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636065","url":null,"abstract":"Damping is required in grid-connected LCL-filtered inverters. Due to additional power losses caused by passive elements, active damping is more favorable. As an active damping solution, the single-loop filter-based damping, being directly plugged into the current controller, features no extra sensors and simplicity, and thus it has drawn much attention in LCL-filtered inverters. However, the existing filter-based damping is not very satisfactory because of limited frequency characteristics. For example, the notch filter designed for a low LCL-resonance frequency does not function well for a high resonance frequency owing to its overmuch phase lead, which means that one filter is not sufficient to cover all possible LCL resonance frequencies caused by parameter drifts, indicating unnecessary repetitive designs and poor universality. Thus, this paper proposes a notch-like digital filter-based single-loop active damping method, which covers a wide range of frequencies up to the Nyquist frequency. That is, the proposed is robust against LCL filter parameter drifts and grid impedance variations. Simulation results verify the proposed method.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125828353","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8636095
Aiting Jiang, Yang Han, Ping Yang, Congling Wang, Jingqi Xiong
Microgrid is widely used in recent years, which can operate in grid-connected mode or islanded mode. For the islanded microgrid, one essential task is the accurate power sharing. With the hierarchical control, which is widely used in the microgrids, the active power sharing can be achieved accurately. However, due to the mismatched line impedances, the performance of the reactive power sharing is poor. In order to share the reactive power accurately, in this paper, a new control strategy, named enhanced consensus-based distributed control, is proposed, which introduces the consensus distribute protocol and the band-pass filter (BPF) into the typical hierarchical control. For the proposed strategy, the consensus distribute protocol is introduced to adaptively regulate the virtual impedance and share the reactive power accurately. Moreover, since the low band-width communication is usually needed in the hierarchical control, which can degrade the performance of the system, the BPF is applied in this paper without any communication lines and any control loops. Finally, simulation results are provided to confirm the validity and effectiveness of the proposed control strategy for the reactive power sharing in islanded MG.
{"title":"Enhanced Consensus-based Distributed Control for Accurate Reactive Power Sharing of Islanded Microgrids Without LBC lines","authors":"Aiting Jiang, Yang Han, Ping Yang, Congling Wang, Jingqi Xiong","doi":"10.1109/SPEC.2018.8636095","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8636095","url":null,"abstract":"Microgrid is widely used in recent years, which can operate in grid-connected mode or islanded mode. For the islanded microgrid, one essential task is the accurate power sharing. With the hierarchical control, which is widely used in the microgrids, the active power sharing can be achieved accurately. However, due to the mismatched line impedances, the performance of the reactive power sharing is poor. In order to share the reactive power accurately, in this paper, a new control strategy, named enhanced consensus-based distributed control, is proposed, which introduces the consensus distribute protocol and the band-pass filter (BPF) into the typical hierarchical control. For the proposed strategy, the consensus distribute protocol is introduced to adaptively regulate the virtual impedance and share the reactive power accurately. Moreover, since the low band-width communication is usually needed in the hierarchical control, which can degrade the performance of the system, the BPF is applied in this paper without any communication lines and any control loops. Finally, simulation results are provided to confirm the validity and effectiveness of the proposed control strategy for the reactive power sharing in islanded MG.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124880500","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635964
E. Tsioumas, N. Jabbour, M. Koseoglou, Ilias Sfetkos, C. Mademlis
This paper proposes an electric energy management system (EEMS) based on the particle swarm optimization (PSO) technique that can provide enhanced effectiveness in the appliance scheduling and energy storage control of a nearly zero energy building (nZEB). Specifically, the PSO online finds the optimal operating condition by properly time shifting the controllable loads of a nZEB and regulating the direction of the energy flow and the current of the electric energy storage system (EESS). Therefore, shaving of the consumption peaks of the household energy demand as well as improved exploitation of the energy storage capability and protection of the lifespan of the EESS are accomplished. The above both provide efficiency increase and enhancement of the stability and the seamless operation of the nZEB electric microgrid. The EESS consists of Li-ion batteries. The effectiveness of the proposed EEMS is evaluated by using a hardware-in-the-loop (HiL) simulator that consists of a microcontroller board of ST that houses the control software and the DS1104 controller board of dSPACE that accommodates the models of the renewable energy sources (RES), the EESS with Li-ion batteries and the electric loads of the nZEB. The developed HiL provides a comparable advantage that is the easy adaptation to any potential changes of the layout of the nZEB microgrid. In order to validate the feasibility and demonstrate the competitive advantages of the EEMS as well as the effectiveness of the developed HiL, several testing results are presented and discussed.
{"title":"Enhanced Effectiveness in the Appliance Scheduling and Energy Storage Control by utilizing the Particle Swarm Technique for a Nearly Zero Energy Building","authors":"E. Tsioumas, N. Jabbour, M. Koseoglou, Ilias Sfetkos, C. Mademlis","doi":"10.1109/SPEC.2018.8635964","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635964","url":null,"abstract":"This paper proposes an electric energy management system (EEMS) based on the particle swarm optimization (PSO) technique that can provide enhanced effectiveness in the appliance scheduling and energy storage control of a nearly zero energy building (nZEB). Specifically, the PSO online finds the optimal operating condition by properly time shifting the controllable loads of a nZEB and regulating the direction of the energy flow and the current of the electric energy storage system (EESS). Therefore, shaving of the consumption peaks of the household energy demand as well as improved exploitation of the energy storage capability and protection of the lifespan of the EESS are accomplished. The above both provide efficiency increase and enhancement of the stability and the seamless operation of the nZEB electric microgrid. The EESS consists of Li-ion batteries. The effectiveness of the proposed EEMS is evaluated by using a hardware-in-the-loop (HiL) simulator that consists of a microcontroller board of ST that houses the control software and the DS1104 controller board of dSPACE that accommodates the models of the renewable energy sources (RES), the EESS with Li-ion batteries and the electric loads of the nZEB. The developed HiL provides a comparable advantage that is the easy adaptation to any potential changes of the layout of the nZEB microgrid. In order to validate the feasibility and demonstrate the competitive advantages of the EEMS as well as the effectiveness of the developed HiL, several testing results are presented and discussed.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125201207","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 : 2018-12-01DOI: 10.1109/SPEC.2018.8635881
Shirish Raizada, V. Verma
The architecture, analysis and performance of Coupled Inductor based Isolated Voltage Multiplier Converter (CII-VMC) feeding the passive load is presented in the paper. The presented circuit topology distributes the responsibilities of boosting of voltage gain to its three section, viz, input boost section (IBS), voltage multiplier section (VMS) and transformer section (TS). The uniqueness of proposed converter for utilizing the preliminary interleaved boosting, followed by voltage multiplier technique harnessing high voltage gain while inheriting the galvanic isolation with gain through high frequency center tapped transformer makes it capable of operating with very high gain with higher efficiency. A 750W CII-VMC with step up from 40V to 400V is presented in the paper. The comparative analysis of the cumulative and differential coupling and coefficient of coupling in the interleaved boost stage is also analyzed. The steady state and dynamic performance of the coupled inductor under load transient and its effects on the multiplier stage in terms of current ripple is presented through results. The performance of CII-VMC is simulated under the MATLAB environment and the results are validated through analysis.
{"title":"Coupled Inductor based Isolated Voltage Multiplier Converter","authors":"Shirish Raizada, V. Verma","doi":"10.1109/SPEC.2018.8635881","DOIUrl":"https://doi.org/10.1109/SPEC.2018.8635881","url":null,"abstract":"The architecture, analysis and performance of Coupled Inductor based Isolated Voltage Multiplier Converter (CII-VMC) feeding the passive load is presented in the paper. The presented circuit topology distributes the responsibilities of boosting of voltage gain to its three section, viz, input boost section (IBS), voltage multiplier section (VMS) and transformer section (TS). The uniqueness of proposed converter for utilizing the preliminary interleaved boosting, followed by voltage multiplier technique harnessing high voltage gain while inheriting the galvanic isolation with gain through high frequency center tapped transformer makes it capable of operating with very high gain with higher efficiency. A 750W CII-VMC with step up from 40V to 400V is presented in the paper. The comparative analysis of the cumulative and differential coupling and coefficient of coupling in the interleaved boost stage is also analyzed. The steady state and dynamic performance of the coupled inductor under load transient and its effects on the multiplier stage in terms of current ripple is presented through results. The performance of CII-VMC is simulated under the MATLAB environment and the results are validated through analysis.","PeriodicalId":335893,"journal":{"name":"2018 IEEE 4th Southern Power Electronics Conference (SPEC)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131411571","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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