孤立微电网中基于输出电压复合控制的电压源型并网逆变器谐波电流抑制策略

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摘要针对具有平衡谐波电压扰动的孤立水光互补微电网系统,根据叠加原理提出一种电压源并网逆变器并网谐波电流抑制策略。首先利用陷波器将网侧电压基频与谐波分量进行分离,利用下垂功率控制器对逆变器输出端基频电压分量进行下垂控制;同时逆变器电压电流内环采用基于旋转坐标系的比例积分与谐振混合控制器,在保证逆变器向电网注入基频电流的同时,提高逆变器控制环路对网侧电压谐波分量的跟踪能力,通过减少网侧与逆变器输出端谐波电压误差的方法,降低系统并网电流的谐波含量;最后仿真和实验结果验证了所提策略的有效性。

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	冯伟
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关键词 ：谐波电流, 电压源逆变器, 下垂控制, 微电网

Abstract：The principle of injected fundamental and harmonic current of grid-connected inverter with droop controller is analyzed firstly in this paper, and a compound harmonic current suppression strategy of GC-VCI with distorted grid voltage is proposed. A notch filter is firstly designed for the separation of different frequency components of the PCC voltage. Then the fundamental component of the inverter’s output is controlled by the droop controller solely. A PIR complex controller is adopted for enhancing the tracking ability for harmonic component. As a result, the difference of harmonic voltage between PCC and the output point of inverter is reduced, and the injected harmonic current is decreased. These theoretical findings are verified through simulations and experiments on the laboratory platform with two inverters.

Key words： Harmonic current voltage source inverter droop microgrid

收稿日期: 2015-02-03 出版日期: 2016-04-20

PACS:

TM464

基金资助:国家国际科技合作专项(2014DFG62610),国家高技术研究发展(863)计划(2015AA050606),北京市自然科学基金重点项目(KZ201511232035)资助项目。

作者简介: 冯伟男,1983年生,博士研究生,研究方向为水光互补发电系统及微电网能量管理系统。E-mail:fwqqrse@163.com(通信作者);孙凯男,1977年生,副教授,研究方向为电力电子与新能源发电。E-mail:sun-kai@mail.tsinghua.edu.cn

引用本文:

冯伟, 孙凯, 关雅娟, 王一波. 孤立微电网中基于输出电压复合控制的电压源型并网逆变器谐波电流抑制策略[J]. 电工技术学报, 2016, 31(7): 72-80. Feng Wei, Sun Kai, Guan Yajuan, Wang Yibo. A Harmonic Current Suppression Strategy for Voltage Source Grid-Connected Inverters Based on Output Voltage Hybrid Control in Islanded Microgrids. Transactions of China Electrotechnical Society, 2016, 31(7): 72-80.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I7/72

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