改进型虚拟同步发电机控制策略  

Control Strategy for Improved Virtual Synchronous Generator

作　　者：王超[1] 武健[1] 魏家昊 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150000 [2]国网江苏省电力公司泰州供电公司,江苏泰州225300

出　　处：《广东电力》2017年第12期38-42,共5页Guangdong Electric Power

基　　金：国家自然科学基金项目(51407043)

摘　　要：传统的虚拟同步发电机(virtual synchronous generator,VSG)控制策略由于在本体模型中转动惯量为常数,会使并网逆变器在接近稳态时产生功率振荡和功率偏差。针对这个问题,提出一种改善的VSG控制策略。该控制策略在传统的本体模型中使用带通阻尼系数代替常数阻尼系数,当电网频率与转子频率偏差较小时,使并网逆变器能够迅速进入稳定状态,与传统的常数阻尼系数相比,带通阻尼系数不仅能够抑制功率振荡而且不会影响VSG输出有功功率。在MATLAB/Simulink中对该控制策略进行验证,结果表明在离网和并网情况下该控制策略可以实现正常运行,满足电能质量的要求。Rotational inertia of control strategy of traditional virtual synchronous generator （VSG） is constant in the ontology model, which may produce power oscillation and deviation of the grid-connected inverter as it approaches to a steady state. Therefore,the paper presents a kind of improved control strategy for VSG. This strategy adopts band-pass damping factor to replace constant damping factor in the traditional ontology model, which makes the grid-connected inverter rapidly get in-to a steady state when deviation of the power grid frequency and rotational frequency is smaH. Compared with traditional constant damping factor, band-pass damping factor can not only suppress power oscillation but also have no effect on output active power of VSG. Based on MATLAB/Simulink, the paper verifies this control strategy and the result indicates thestrategy is in normal performance under off-grid mode or g： lectric power quality.

关 键 词：虚拟同步发电机 并网逆变器 带通阻尼系数 常数阻尼系数 功率振荡 

分 类 号：TM743[电气工程—电力系统及自动化]