电网电压不平衡时逆变器无交流电压传感器控制策略

doi:10.19595/j.cnki.1000-6753.tces.L70204

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Abstract In order to adapt to the non-ideal grid voltage conditions, a AC voltage sensorless control of 3-phase voltage source inverter under unbalanced grid voltage has been researched. Second order generalized integrator is used to build quadrature filter and voltage observer for unbalanced grid voltage, and grid voltage can be hence observed directly in the two-phase static coordinate. Then positive and negative sequence separation can be carried out by using outputs of the quadrature filter, which also can be synchronized with the grid voltage observation. Finally, combined with PR control in the two-phase static coordinate of the inverter and negative sequence compensation algorithm, the AC voltage sensorless control of the inverter under unbalanced grid voltage can be achieved. Compared with the conventional virtual flux observation, the proposed method can get rid of the problems of windup, initial value sensitivity and static error, and also overcome the problem that the conventional quadrature filter based AC voltage sensorless control cannot adapt to the unbalanced grid voltage. The proposed methods and theories have been verified via simulations and experiments.

Key words： 3-phase voltage source inverter AC voltage sensorless control unbalanced grid voltage voltage observer positive and negative sequence separation

Published: 16 January 2018

PACS:	TM712
	TM451

Fund:国家科技支撑计划资助项目（2015BAA07B02）

Corresponding Authors: 胡书举男,1978年生,博士,研究员,硕士生导师,研究方向为风力发电、光伏发电电气控制及测试技术。E-mail: hushuju@mail.iee.ac.cn

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	Hu Shuju
	Meng Yanfeng
	Li Fenglin
	Song Bin
	Deng Ya

Cite this article:

Hu Shuju,Meng Yanfeng,Li Fenglin等. AC Voltage Sensorless Control Strategy of Grid-Connected Inverter under Unbalanced Grid Voltage[J]. Transactions of China Electrotechnical Society, 2017, 32(24): 146-152.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L70204 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I24/146

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