双PWM型动态电压恢复器的最大输出能力分析

doi:10.19595/j.cnki.1000-6753.tces.171645

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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。

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	涂春鸣
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关键词 ： DVR输出能力, 电压跌落深度, 负荷波动幅度, 直流电压稳定

Abstract：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.

Key words： DVR output capability voltage sag depth load fluctuation DC voltage stability

收稿日期: 2017-12-05 出版日期: 2018-11-12

PACS:

TM464

基金资助: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）和可再生能源电力技术湖南省重点实验室基金（2017ZNDL005）资助项目

作者简介: 涂春鸣男,1976年生,教授,博士生导师,研究方向为电能质量、微电网等。E-mail: chunming_tu@263.net;孙勇男,1993年生,硕士研究生,研究方向为电力电子在电力系统中的应用。E-mail: sunyong@hnu.edu.cn（通信作者）

引用本文:

涂春鸣, 孙勇, 李珺, 郭祺, 姜飞. 双PWM型动态电压恢复器的最大输出能力分析[J]. 电工技术学报, 2018, 33(21): 5015-5025. Tu Chunming, Sun Yong, Li Jun, Guo Qi, Jiang Fei. Analysis of the Maximum Output Capacity for Dual-PWM Dynamic Voltage Restorer. Transactions of China Electrotechnical Society, 2018, 33(21): 5015-5025.

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