基于并网点电压控制的逆变器分布式并网谐振抑制策略  

A Strategy to Suppress Resonance of Distribution Network-Connected Inverters Based on Voltage Control at Point of Common Coupling

作　　者：刘红 

机构地区：[1]浙江埃菲生能源科技有限公司,浙江省温州市325000

出　　处：《电网技术》2015年第2期334-340,共7页Power System Technology

摘　　要：分布式电网的动态多变性使得并网逆变器的控制具有一定的挑战,设计一种带有谐振抑制功能的控制算法具有重要意义。为此,提出了一种基于并网点电压控制的谐振抑制策略。首先,分析了并网逆变器与电网的交互影响和谐振机理。其次,利用谐振时并网点电压畸变的特点,设计了控制方程式。并根据数学模型进行了稳定性分析,以及从理论上证明了通过并网点电压控制可以消除系统谐振。最后,通过在组串型光伏并网逆变器上的对比实验,验证了该控制策略的有效性。Dynamic changefulness of distributed power network makes a challenge to the control of grid-connected inverters, thus it is significant to design a control algorithm with the function of suppressing resonance. A resonance control strategy based on the voltage control of the point of common coupling is designed. Firstly, the interaction between grid-connected inverters and power grid and the mechanism of the resonance are analyzed; secondly, utilizing the feature of voltage distortion at the point of common coupling during the resonance, the control equation is designed, and according to the designed mathematical model the stability analysis is performed and it is proved theoretically that the system resonance can be suppressed by voltage control at point of common coupling; finally, the effectiveness of the proposed control strategy is validated by tie results of comparative experiments with string photovoltaic （PV） inverters.

关 键 词：分布式发电 并网逆变器 谐振抑制 公共连接点 电压控制 

分 类 号：TM721[电气工程—电力系统及自动化]