Operating Characteristics Analysis of Series Capacitance Coupled Dynamic Voltage Restorer Based on Minimum Energy Compensation Method
Tu Chunming1, Lu Baihua1, Guo Qi1, Gao Jiayuan1, Jiang Fei2
1. National Electric Power Conversion Control Engineering Technology Research Center Hunan University Changsha 410082 China 2. School of Electrical and Information Engineering Changsha University of Science & Technology Changsha 410004 China
Abstract：When the traditional dynamic voltage restorer (DVR) adopts the in-phase compensation method to solve the voltage sag problem, the output voltage amplitude of the inverter is small but the active power demand is large, while the minimum energy compensation method reduces the active power demand and increases the output voltage of the inverter, which is difficult to have both advantages. Based on this, this paper proposes a series capacitance coupled DVR. By combining with the minimum energy compensation method, the proposed structure can not only achieve the minimum active output, but also significantly reduce the output voltage of the inverter, thus effectively reducing the capacity of the inverter and the voltage level of the DC side. This paper first introduces the basic circuit structure and working principle of series capacitance coupled DVR, and compares its superiority in output voltage and power level. Next, the operation boundary of the inverters is analyzed. In order to avoid the output voltage of the inverters exceeding its maximum output capacity under load fluctuation, the operation state adjustment strategy suitable for series capacitance coupled DVR is proposed to ensure the normal and stable operation of the device. Then, the influence of series capacitance on the stability and filtering effect of the control system is analyzed, and the optimal topology structure of series capacitance coupled DVR is selected. Finally, the effectiveness and feasibility of the series capacitance coupled DVR proposed in this paper are fully verified by simulation and experimental.
涂春鸣, 卢柏桦, 郭祺, 高家元, 姜飞. 基于最小能量补偿法的串联电容耦合型动态电压恢复器运行特性分析[J]. 电工技术学报, 2020, 35(17): 3727-3738.
Tu Chunming, Lu Baihua, Guo Qi, Gao Jiayuan, Jiang Fei. Operating Characteristics Analysis of Series Capacitance Coupled Dynamic Voltage Restorer Based on Minimum Energy Compensation Method. Transactions of China Electrotechnical Society, 2020, 35(17): 3727-3738.
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2020, Vol. 35 
