摘要
动态电压恢复器(DVR)可以抑制系统侧电压波动对敏感负荷的影响。该文综合考虑了电网电压跌落深度、负荷波动幅度以及并联变流器带载能力对双PWM型DVR补偿能力的影响,深入分析其极限输出电压范围。通过建立并、串联变流器的等效数学模型,从保持直流侧电压稳定的并联变流器带载能力角度出发,得到了串联变流器调制比与电网电压幅度、负荷大小、直流侧电压以及变流器电路参数的关系,由此确定了系统定参数下基于直流侧稳定的DVR最大输出能力,并绘制了电网电压跌落深度和负荷波动幅度对DVR输出能力的影响关系曲线。此外,结合以上分析对变流器电路参数和容量进行了系统设计。仿真和实验结果验证了理论分析的正确性。
Dynamic voltage restorer(DVR)can suppress the voltage fluctuation on sensitive load.Considering the influence of voltage sag depth,load fluctuation and load capacity of shunt converter on the compensation capability of dual-PWM DVR,the output voltage range of DVR is analyzed deeply.The mathematical models of converters are computed,the relationship between the modulation ratio of series converter and the gird voltage,load magnitude,DC voltage and converter circuit parameters is obtained,based on the load capacity of the shunt converter of keeping the DC voltage stable.Thus,the maximum output capability of DVR based on DC side stability is determined under the fixed circuit parameters,and the influence curve of the output capacity for DVR is plotted.In addition,the circuit parameters and capacity of the converters are designed based on the above analysis.The simulation and experimental results verify the correctness of the theoretical analysis.
作者
涂春鸣
孙勇
李珺
郭祺
姜飞
Tu Chunming;Sun Yong;Li Jun;Guo Qi;Jiang Fei(National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China;Shenzhen Entry-Exit Inspection and Quarantine Bureau Shenzhen 518172 China;School of Electrical and Information Engineering Changsha University of Science&Technology Changsha 410004 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第21期5015-5025,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51377051)
国家自然科学基金青年基金(51707014)
湖南省教育厅资助科研项目(17C0040)
可再生能源电力技术湖南省重点实验室基金(2017ZNDL005)资助项目
