Cascaded H-bridge inverter(CHBI) with supercapacitors(SCs) and dc-dc stage shows significant promise for medium to high voltage energy storage applications. This paper investigates the voltage balance of capacitors wi...Cascaded H-bridge inverter(CHBI) with supercapacitors(SCs) and dc-dc stage shows significant promise for medium to high voltage energy storage applications. This paper investigates the voltage balance of capacitors within the CHBI, including both the dc-link capacitors and SCs. Balance control over the dc-link capacitor voltages is realized by the dcdc stage in each submodule(SM), while a hybrid modulation strategy(HMS) is implemented in the H-bridge to balance the SC voltages among the SMs. Meanwhile, the dc-link voltage fluctuations are analyzed under the HMS. A virtual voltage variable is introduced to coordinate the balancing of dc-link capacitor voltages and SC voltages. Compared to the balancing method that solely considers the SC voltages, the presented method reduces the dc-link voltage fluctuations without affecting the voltage balance of SCs. Finally, both simulation and experimental results verify the effectiveness of the presented method.展开更多
直流侧电压的控制是并联型有源电力滤波器(Active power filter,APF)的关键技术之一。直流侧电压的大小将影响到APF的功率损耗和补偿性能。而在复杂的工业应用场所,各种负载的波动将会造成APF公共耦合点的电网电压的波动,进而影响到APF...直流侧电压的控制是并联型有源电力滤波器(Active power filter,APF)的关键技术之一。直流侧电压的大小将影响到APF的功率损耗和补偿性能。而在复杂的工业应用场所,各种负载的波动将会造成APF公共耦合点的电网电压的波动,进而影响到APF的补偿性能。以三相三线级联式H桥有源电力滤波器为例,分析了APF直流侧电压大小和变化影响APF补偿性能的问题,提出了一种将控制模块分成模块均值电压控制器和直流母线电压控制器两个部分的新型控制方法。通过Matlab仿真结果表明系统在跟踪输出补偿电流的同时,实现了直流侧电容电压的平衡与稳定控制。最后的结论是采用上述电压控制方法不仅能使有源电力滤波器能很好地跟踪补偿电网谐波,而且具有很好的动态响应和较高的检测精度,并且快速准确地实现各个变流器单元直流侧电压控制。展开更多
基金supported in part by the CAS Project for Young Scientists in Basic Research under Grant No. YSBR-045the Youth Innovation Promotion Association CAS under Grant 2022137the Institute of Electrical Engineering CAS under Grant E155320101。
文摘Cascaded H-bridge inverter(CHBI) with supercapacitors(SCs) and dc-dc stage shows significant promise for medium to high voltage energy storage applications. This paper investigates the voltage balance of capacitors within the CHBI, including both the dc-link capacitors and SCs. Balance control over the dc-link capacitor voltages is realized by the dcdc stage in each submodule(SM), while a hybrid modulation strategy(HMS) is implemented in the H-bridge to balance the SC voltages among the SMs. Meanwhile, the dc-link voltage fluctuations are analyzed under the HMS. A virtual voltage variable is introduced to coordinate the balancing of dc-link capacitor voltages and SC voltages. Compared to the balancing method that solely considers the SC voltages, the presented method reduces the dc-link voltage fluctuations without affecting the voltage balance of SCs. Finally, both simulation and experimental results verify the effectiveness of the presented method.
文摘直流侧电压的控制是并联型有源电力滤波器(Active power filter,APF)的关键技术之一。直流侧电压的大小将影响到APF的功率损耗和补偿性能。而在复杂的工业应用场所,各种负载的波动将会造成APF公共耦合点的电网电压的波动,进而影响到APF的补偿性能。以三相三线级联式H桥有源电力滤波器为例,分析了APF直流侧电压大小和变化影响APF补偿性能的问题,提出了一种将控制模块分成模块均值电压控制器和直流母线电压控制器两个部分的新型控制方法。通过Matlab仿真结果表明系统在跟踪输出补偿电流的同时,实现了直流侧电容电压的平衡与稳定控制。最后的结论是采用上述电压控制方法不仅能使有源电力滤波器能很好地跟踪补偿电网谐波,而且具有很好的动态响应和较高的检测精度,并且快速准确地实现各个变流器单元直流侧电压控制。
