Pub Date : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709481
Wenlan Gong, Jing Xiao, Liqun Yin, Ning Wu, Shaonan Chen
For the wireless power transmission with medium and long transmission distance, the intermediate coil is a good solution. In order to analyze intermediate coil transfer characteristics of the single, double and three layers, firstly, based on the understanding of the circuit structure of the Magnetic coupling resonance wireless power transfer (MCRWPT) system, the theoretical calculation formula of output power and efficiency is deduced according to Kirchhoffs law. Then, mutual inductance of coils and magnetic field strength was simulated in ANSYS Maxwell. On the premise that mutual inductance of the three coils was approximately equal, the number of turns of the three coils was obtained, and the theoretical value of AC resistance was calculated by using the formula. Finally, the experimental platform is built to measure the actual mutual inductance, self-inductance and AC resistance, and calculate their transmission efficiency. The results show that the single layer coil has the smallest internal resistance and the highest transmission efficiency at 200 kHz and 32 cm transmission distance. Finally, the rationality of the theoretical calculation formula of Litz-coil resistance is verified by experiments.
{"title":"Energy transfer characteristics analysis of MCR-WPT system with intermediate coils","authors":"Wenlan Gong, Jing Xiao, Liqun Yin, Ning Wu, Shaonan Chen","doi":"10.1109/SPEC52827.2021.9709481","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709481","url":null,"abstract":"For the wireless power transmission with medium and long transmission distance, the intermediate coil is a good solution. In order to analyze intermediate coil transfer characteristics of the single, double and three layers, firstly, based on the understanding of the circuit structure of the Magnetic coupling resonance wireless power transfer (MCRWPT) system, the theoretical calculation formula of output power and efficiency is deduced according to Kirchhoffs law. Then, mutual inductance of coils and magnetic field strength was simulated in ANSYS Maxwell. On the premise that mutual inductance of the three coils was approximately equal, the number of turns of the three coils was obtained, and the theoretical value of AC resistance was calculated by using the formula. Finally, the experimental platform is built to measure the actual mutual inductance, self-inductance and AC resistance, and calculate their transmission efficiency. The results show that the single layer coil has the smallest internal resistance and the highest transmission efficiency at 200 kHz and 32 cm transmission distance. Finally, the rationality of the theoretical calculation formula of Litz-coil resistance is verified by experiments.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130019539","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709456
Sarah M. Waly, A. E. Halim, Hazem H. Mostafa, E. Bayoumi
The photovoltaic system is one of the sustainable renewable energy cornerstones that has piqued the interest of researchers in recent years. Since environmental factors such as temperature and radiation levels change over time, the system’s productive strength is impacted. Due to the system’s decreased effectiveness as a result of these changes, a technique called Maximum Power Point Tracking (MPPT) should be utilized to improve the overall system. MPPT is a programmable control innovation that is used to achieve the optimal pool of energy possible. The Maximum Power Point Tracking algorithm in a PV system under variable irradiance and temperature is presented in this paper. For MPPT, the perturb and observe (P&O) method is proposed. The proposed technique provides faster integration with the greatest strength, resulting in a more efficient overall system. The overall system is simulated using MATLAB/SIMULINK POWER LIB, and a practical prototype is implemented in the meantime. Both findings indicate that the proposed system’s anticipated outcomes are met successfully.
光伏系统是可持续可再生能源的基石之一，近年来引起了研究人员的兴趣。由于温度和辐射水平等环境因素会随时间变化，因此系统的生产强度会受到影响。由于这些变化导致系统的效率下降，应该利用一种称为最大功率点跟踪(MPPT)的技术来改进整个系统。MPPT是一种可编程控制创新，用于实现最佳的能源池。研究了变辐照度和变温度条件下光伏系统的最大功率点跟踪算法。对于MPPT，提出了摄动与观测(P&O)方法。所建议的技术以最大的强度提供更快的集成，从而产生更有效的整体系统。利用MATLAB/SIMULINK POWER LIB对整个系统进行了仿真，并实现了实际样机。这两项调查结果都表明，拟议系统的预期结果已成功实现。
{"title":"Power Tracking Photovoltaic System Tied to Single-Phase Grid","authors":"Sarah M. Waly, A. E. Halim, Hazem H. Mostafa, E. Bayoumi","doi":"10.1109/SPEC52827.2021.9709456","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709456","url":null,"abstract":"The photovoltaic system is one of the sustainable renewable energy cornerstones that has piqued the interest of researchers in recent years. Since environmental factors such as temperature and radiation levels change over time, the system’s productive strength is impacted. Due to the system’s decreased effectiveness as a result of these changes, a technique called Maximum Power Point Tracking (MPPT) should be utilized to improve the overall system. MPPT is a programmable control innovation that is used to achieve the optimal pool of energy possible. The Maximum Power Point Tracking algorithm in a PV system under variable irradiance and temperature is presented in this paper. For MPPT, the perturb and observe (P&O) method is proposed. The proposed technique provides faster integration with the greatest strength, resulting in a more efficient overall system. The overall system is simulated using MATLAB/SIMULINK POWER LIB, and a practical prototype is implemented in the meantime. Both findings indicate that the proposed system’s anticipated outcomes are met successfully.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"54 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133720982","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709451
S. Islam, Souradip De, A. Iqbal, F. I. Bakhsh, Laith Kanaan
The effects of mismatched interconnecting cable impedances, unequal local loads connected near to sources and difference in nominal voltages of sources lead to inaccurate reactive power sharing in ac microgrid. To ensure proportional reactive power sharing among sources, the Ideal Reactive Power Sharing (IRPS) controller is proposed in this paper. The controller shifts E-Q characteristics parallel to the voltage axis, in such a way that each converter supplies reactive power equal to its ideal value which is calculated using communication network. Ideal value of reactive power supplied by each source is the power when the equivalent output impedance of all sources as seen by loads are identical. The suggested controller shifts the E-Q droop characteristics of sources in such a way that each source supplies power in proportion to its rated capacity. The key advantages offered by proposed controller are accurate reactive power sharing and good voltage regulation. The controller provides stabilized operation even in case of error in communicated values. To validate the efficacy of proposed controller, detailed simulation studies are carried out in Real Time Digital Simulator (RTDS) platform.
{"title":"Compensation of Effect of Line Parameters on Reactive Power Sharing in AC Microgrid","authors":"S. Islam, Souradip De, A. Iqbal, F. I. Bakhsh, Laith Kanaan","doi":"10.1109/SPEC52827.2021.9709451","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709451","url":null,"abstract":"The effects of mismatched interconnecting cable impedances, unequal local loads connected near to sources and difference in nominal voltages of sources lead to inaccurate reactive power sharing in ac microgrid. To ensure proportional reactive power sharing among sources, the Ideal Reactive Power Sharing (IRPS) controller is proposed in this paper. The controller shifts E-Q characteristics parallel to the voltage axis, in such a way that each converter supplies reactive power equal to its ideal value which is calculated using communication network. Ideal value of reactive power supplied by each source is the power when the equivalent output impedance of all sources as seen by loads are identical. The suggested controller shifts the E-Q droop characteristics of sources in such a way that each source supplies power in proportion to its rated capacity. The key advantages offered by proposed controller are accurate reactive power sharing and good voltage regulation. The controller provides stabilized operation even in case of error in communicated values. To validate the efficacy of proposed controller, detailed simulation studies are carried out in Real Time Digital Simulator (RTDS) platform.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116582206","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709440
J. Ehnberg, Paolo Cardarelli, Liam Hultén, Mohammed Mubeen Shaikh, Gopalakrishnan Sivakumar, Rishabh Vishwanatha
The sustainable development goals were adopted by the United Nations in 2015 to propel the efforts of countries all over the world towards a more sustainable future. One can agree that although technology cannot solve all our problems, it can create many paths towards solutions and is perhaps one of the most powerful tools towards prosperity. Smart grid development, with its correspondence with the electrical grid development is of particular interest since electricity is a precursor to both innovation and progress. In this study, the contribution of smart grids towards the aforementioned sustainable development goals has been analyzed for both developed and developing countries. These contributions have been identified as either short-term contributions or long-term contributions, with long term contributions being predominant in developing countries due to limitations associated with the existing infrastructure. Following this, a number of central concepts where smart grids could contribute to several goals are identified and discussed.
{"title":"Short and Long term Smart grid Contribution to the Sustainable Development Goals","authors":"J. Ehnberg, Paolo Cardarelli, Liam Hultén, Mohammed Mubeen Shaikh, Gopalakrishnan Sivakumar, Rishabh Vishwanatha","doi":"10.1109/SPEC52827.2021.9709440","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709440","url":null,"abstract":"The sustainable development goals were adopted by the United Nations in 2015 to propel the efforts of countries all over the world towards a more sustainable future. One can agree that although technology cannot solve all our problems, it can create many paths towards solutions and is perhaps one of the most powerful tools towards prosperity. Smart grid development, with its correspondence with the electrical grid development is of particular interest since electricity is a precursor to both innovation and progress. In this study, the contribution of smart grids towards the aforementioned sustainable development goals has been analyzed for both developed and developing countries. These contributions have been identified as either short-term contributions or long-term contributions, with long term contributions being predominant in developing countries due to limitations associated with the existing infrastructure. Following this, a number of central concepts where smart grids could contribute to several goals are identified and discussed.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"158 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125928919","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709487
R. Power, Alykhan Mithani, U. Madawala, C. Baguley
Worldwide, distributed generation sources are being installed in increasing numbers within distribution networks. This poses new challenges for distribution network operators, including voltage fluctuations beyond permissible limits that can differ in different parts of the same distribution network. The Hybrid Transformer (HT) is an effective solution that can mitigate voltage fluctuations continuously, dynamically and in a local manner, through combining a standard distribution transformer with a power electronic converter. In this paper a retrofittable HT topology is proposed. It utilises a second, fractionally-rated line frequency transformer (LFT) to enable the use of low-voltage power electronics with low power ratings for reduced costs and complexity. The proposed topology is modelled and a scaled hardware prototype is used to verify theory and simulation results. The simulation and experimental results show the efficacy of the proposed topology, its applicability to mitigate voltage fluctuations, and its benefits over alternative approaches.
{"title":"A Hybrid Transformer Topology for Distribution Network Voltage Regulation","authors":"R. Power, Alykhan Mithani, U. Madawala, C. Baguley","doi":"10.1109/SPEC52827.2021.9709487","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709487","url":null,"abstract":"Worldwide, distributed generation sources are being installed in increasing numbers within distribution networks. This poses new challenges for distribution network operators, including voltage fluctuations beyond permissible limits that can differ in different parts of the same distribution network. The Hybrid Transformer (HT) is an effective solution that can mitigate voltage fluctuations continuously, dynamically and in a local manner, through combining a standard distribution transformer with a power electronic converter. In this paper a retrofittable HT topology is proposed. It utilises a second, fractionally-rated line frequency transformer (LFT) to enable the use of low-voltage power electronics with low power ratings for reduced costs and complexity. The proposed topology is modelled and a scaled hardware prototype is used to verify theory and simulation results. The simulation and experimental results show the efficacy of the proposed topology, its applicability to mitigate voltage fluctuations, and its benefits over alternative approaches.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115610212","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709474
E. Aladesanmi, Remmy Musumpuka, D. Dorrell
In this paper, a more secure method for utilising reverse power flow to supply power to smart grids through a multi-port power electronic transformer (MPPET) is proposed. The method consists of a reverse power flow detection stage (RPFDS) electrically coupled to the point of common coupling (PCC), which differentiates between the total power generated on the grid and the actual load demand. A smart circuit breaker is triggered as soon as RPFDS signal is sensed. The MPPET receives power from RPF utilization substation.
{"title":"Multi-Port Power Electronic Transformer","authors":"E. Aladesanmi, Remmy Musumpuka, D. Dorrell","doi":"10.1109/SPEC52827.2021.9709474","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709474","url":null,"abstract":"In this paper, a more secure method for utilising reverse power flow to supply power to smart grids through a multi-port power electronic transformer (MPPET) is proposed. The method consists of a reverse power flow detection stage (RPFDS) electrically coupled to the point of common coupling (PCC), which differentiates between the total power generated on the grid and the actual load demand. A smart circuit breaker is triggered as soon as RPFDS signal is sensed. The MPPET receives power from RPF utilization substation.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116711696","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709444
Kuseso Onai, O. Ojo
The bidirectional wireless power transfer system (BD-WPT) system allows power flow in both directions between a source and a load. High frequency is required to increase the power transfer efficiency and reduce the size of the magnetic components. However, high frequency operation leads to an increase in switching losses of the converter. To reduce these losses, zero voltage switching (ZVS) operation of the converter is required. This paper presents a method of optimizing the coil-to-coil efficiency of the BD-WPT system whilst ensuring that ZVS is achieved. To achieve this goal, harmonic decomposition of the input voltages is used for the ZVS, which gives a better accuracy when compared to the fundamental harmonic approximation method and avoids the complexity of time domain analysis. Lagrange optimization was employed to optimize the efficiency of the coil for a given power requirements. It was shown that for optimum efficiency operation of the converter, the current in the primary and secondary coils should be equal.
{"title":"A method for Selecting the Control Inputs for Zero Voltage Switching and Efficiency Optimization of Bidirectional Wireless Power Transfer System","authors":"Kuseso Onai, O. Ojo","doi":"10.1109/SPEC52827.2021.9709444","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709444","url":null,"abstract":"The bidirectional wireless power transfer system (BD-WPT) system allows power flow in both directions between a source and a load. High frequency is required to increase the power transfer efficiency and reduce the size of the magnetic components. However, high frequency operation leads to an increase in switching losses of the converter. To reduce these losses, zero voltage switching (ZVS) operation of the converter is required. This paper presents a method of optimizing the coil-to-coil efficiency of the BD-WPT system whilst ensuring that ZVS is achieved. To achieve this goal, harmonic decomposition of the input voltages is used for the ZVS, which gives a better accuracy when compared to the fundamental harmonic approximation method and avoids the complexity of time domain analysis. Lagrange optimization was employed to optimize the efficiency of the coil for a given power requirements. It was shown that for optimum efficiency operation of the converter, the current in the primary and secondary coils should be equal.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126385075","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709463
A. Marin-Hurtado, A. Escobar-Mejía, A. Alzate-Gómez, W. Gil-González
Nowadays, the power distribution grid is dominated by single-phase loads that produce unbalance currents, which cause stability problems and large frequency deviations in power systems. The Virtual Synchronous Machine (VSM) method has been proposed for renewable energy sources to reproduce the static and dynamic properties of the traditional synchronous generator, injecting/absorbing active/reactive power to/from the grid. However, the implementation and design of a VSM are not straightforward tasks, especially in an unbalanced network. Because it is necessary to compute and adjust the required inertia and damping parameters during unbalanced currents. Therefore, this paper proposes an adaptive inertia control scheme for a Four-Leg Three-Phase Voltage Source Converter (4LVSC), using the VSM approach, to improve a four-wire power system stability and compensate unbalanced currents. The proposed adaptive inertia comprises a Proportional-Integral (PI), and a Linear Quadratic Regulator (LQR) controller, which uses an optimization problem to minimize the power change and frequency droop when unbalances are presented in a power system. Time-domain simulations have been carried out on a unbalance four-wire power system considering active power variations to evaluate both the power and frequency responses using both controllers. Results show that the LQR-VSM controller presents lower frequency oscillations when compared to the VSM with constant inertia approach.
{"title":"Adaptive Virtual Synchronous Machine Applied to Four-Leg Three-Phase VSC","authors":"A. Marin-Hurtado, A. Escobar-Mejía, A. Alzate-Gómez, W. Gil-González","doi":"10.1109/SPEC52827.2021.9709463","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709463","url":null,"abstract":"Nowadays, the power distribution grid is dominated by single-phase loads that produce unbalance currents, which cause stability problems and large frequency deviations in power systems. The Virtual Synchronous Machine (VSM) method has been proposed for renewable energy sources to reproduce the static and dynamic properties of the traditional synchronous generator, injecting/absorbing active/reactive power to/from the grid. However, the implementation and design of a VSM are not straightforward tasks, especially in an unbalanced network. Because it is necessary to compute and adjust the required inertia and damping parameters during unbalanced currents. Therefore, this paper proposes an adaptive inertia control scheme for a Four-Leg Three-Phase Voltage Source Converter (4LVSC), using the VSM approach, to improve a four-wire power system stability and compensate unbalanced currents. The proposed adaptive inertia comprises a Proportional-Integral (PI), and a Linear Quadratic Regulator (LQR) controller, which uses an optimization problem to minimize the power change and frequency droop when unbalances are presented in a power system. Time-domain simulations have been carried out on a unbalance four-wire power system considering active power variations to evaluate both the power and frequency responses using both controllers. Results show that the LQR-VSM controller presents lower frequency oscillations when compared to the VSM with constant inertia approach.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130643404","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709446
Gayani De Soysa, U. Madawala, Matheus Bevilaqua, N. Patel
Pulsating High Frequency (HF) signal injection technique is one of the sensorless position detection methods. It has demonstrated high accuracy in estimating the rotor position in Permanent Magnet Synchronous Motor (PMSM) drives. However, this technique, which uses magnetic saliency to detect the rotor position, fails to detect the rotor position in Surface Permanent Magnet Synchronous Motors (SPMSMs) under loaded conditions. Therefore, this paper investigates the causes of the rotor position detection failure in SPMSMs. The paper discusses two components that could contribute to an offset error in rotor position estimation, which in turn leads to a failure in the motor operation under loaded conditions. The two offset errors are identified as the time delay in the Low Pass Filter (LPF) used in the rotor position detection loop and the changes in the motor parameters under loaded conditions. Simulation results are presented to show that there exists a correlation between the offset error and the nominal inductance variation factor when the motor is loaded.
{"title":"SPM Motor Operation with High Frequency Signal Injection Technique: Failures and Causes","authors":"Gayani De Soysa, U. Madawala, Matheus Bevilaqua, N. Patel","doi":"10.1109/SPEC52827.2021.9709446","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709446","url":null,"abstract":"Pulsating High Frequency (HF) signal injection technique is one of the sensorless position detection methods. It has demonstrated high accuracy in estimating the rotor position in Permanent Magnet Synchronous Motor (PMSM) drives. However, this technique, which uses magnetic saliency to detect the rotor position, fails to detect the rotor position in Surface Permanent Magnet Synchronous Motors (SPMSMs) under loaded conditions. Therefore, this paper investigates the causes of the rotor position detection failure in SPMSMs. The paper discusses two components that could contribute to an offset error in rotor position estimation, which in turn leads to a failure in the motor operation under loaded conditions. The two offset errors are identified as the time delay in the Low Pass Filter (LPF) used in the rotor position detection loop and the changes in the motor parameters under loaded conditions. Simulation results are presented to show that there exists a correlation between the offset error and the nominal inductance variation factor when the motor is loaded.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133550614","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709482
Gu Xianshan, Yuan Bin, L. Xuan, Yin Congqi
The high frequency oscillation (HFO) of renewable energy integrated into MMC brings serious challenges to the stable operation of power system. This article proposes the mathematical impedance model of MMC with considering control system time delay, sequence component separation, control system. Besides time delay, the main factors of HFO such as SCS, virtual filter of voltage and current, inner-loop controller are derivate in this article. It is proved that SCS may lead to the fluctuation of phase character of MMC high frequency impedance and lead to low damping character of MMC system. Virtual filter of voltage and current can enhance the damping ratio of MMC system. Lower proportional gain of inner-loop control lead to a higher damping character of MMC system. The solutions of HFO are validated in Zhangbei project. The 1550Hz HFO in the project is suppressed by the optimization of control system.
{"title":"Research on the High Frequency Oscillation of MMC-HVDC Integrated into Renewable Energy System","authors":"Gu Xianshan, Yuan Bin, L. Xuan, Yin Congqi","doi":"10.1109/SPEC52827.2021.9709482","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709482","url":null,"abstract":"The high frequency oscillation (HFO) of renewable energy integrated into MMC brings serious challenges to the stable operation of power system. This article proposes the mathematical impedance model of MMC with considering control system time delay, sequence component separation, control system. Besides time delay, the main factors of HFO such as SCS, virtual filter of voltage and current, inner-loop controller are derivate in this article. It is proved that SCS may lead to the fluctuation of phase character of MMC high frequency impedance and lead to low damping character of MMC system. Virtual filter of voltage and current can enhance the damping ratio of MMC system. Lower proportional gain of inner-loop control lead to a higher damping character of MMC system. The solutions of HFO are validated in Zhangbei project. The 1550Hz HFO in the project is suppressed by the optimization of control system.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134362447","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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