A Disturbance Suppression Method for DC Component in Output Voltage of Photovoltaic Grid-connected Inverter

被引：0
|
作者：
Yang Q. [1 ]
Zhang J. [1 ]
Lou G. [1 ]
Liu W. [1 ]
Cao Z. [2 ]
Xu B. [2 ]
Gu W. [1 ]
机构：
[1] School of Electrical Engineering, Southeast University, Nanjing, 210096, Jiangsu Province
[2] State Grid Anhui Electric Power Corporation Research Institute, Hefei, 230601, Anhui Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 05期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
DC component; Disturbance observer; Grid-connected inverter; PR control;
D O I：
10.13335/j.1000-3673.pst.2018.2420
中图分类号：
学科分类号：
摘要：
PV grid-connected inverters without isolation transformer usually have certain amount of DC component in output voltage due to tolerance of power switching device, asymmetry of PWM gating driving pulses, etc. This paper proposes a novel DC suppression control scheme based on disturbance observer. The control parameters of the inner disturbance suppression loop are easy to design, and the DC component in the output voltage can be suppressed without affecting the tracking performance of the normal voltage feedback loop. This paper firstly analyzes the cause of DC injection of PV grid-connected inverter. Then, the DC component in the output voltage of grid-connected inverter is regarded as external disturbance of the system. The disturbance is estimated in real time by the disturbance observer and employed as feedback to adjust SPWM duty ratio in order to achieve dynamic compensation of the DC component in the output voltage of PV grid-connected inverters. Superiority of the proposed method is verified by theoretical comparison with traditional DC suppression methods. Simulation results prove validity and effectiveness of the proposed method. © 2019, Power System Technology Press. All right reserved.
引用
收藏
页码：1550 / 1556
页数：6
相关论文
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