下垂控制逆变器的虚拟功角稳定机理分析  

Mechanism Analysis of Virtual Power Angle Stability in Droop-controlled Inverters

作　　者：黄林彬[1,2] 章雷其[1,2] 辛焕海[1,2] 胡家兵[3] 甘德强[1,2] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]浙江省海洋可再生能源电气装备与系统技术研究重点实验室,浙江省杭州市310027 [3]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《电力系统自动化》2016年第12期117-123,150,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51577168);国家高技术研究发展计划(863计划)资助项目(2015AA050202)~~

摘　　要：在大干扰下,电压源型的下垂控制逆变器会出现与传统同步发电机类似的暂态功角失稳,而且逆变器会因电流饱和而退变成一个电流源,进而出现更复杂的同步稳定问题。文中以逆变器单机无穷大系统为例,通过定义逆变器的虚拟功角,分别得出逆变器电流未饱和时的虚拟功角特性和电流饱和下的虚拟功角特性,在此基础上分析了逆变器的虚拟功角同步稳定机理和失稳过程,以及故障切除时间对逆变器虚拟功角暂态稳定性的影响,并将该分析方法扩展到虚拟同步机的暂态稳定分析中。最后,基于MATLAB/Simulink仿真验证了失稳分析方法的合理性。Under a large disturbance,similar to synchronous generators（SGs）,the transient instability may occur on the voltage-source-type droop-controlled inverters. Moreover,the inverter will turn into a current source since its current saturates,resulting in a more complicated synchronous stability problem.This paper studies on the single-inverter infinite-bus system.The virtual power angle is defined to obtain the virtual power angle characteristics with and without current saturation,which is used to analyze the synchronous stability mechanism of the inverter as well as the instability process.The influences of the fault-clearing time on the virtual power angle stability are also analyzed.And this method is extended to the transient stability analysis of the virtual synchronous machine.Finally,the rationality of the instability analysis method is verified via simulations under MATLAB/Simulink.

关 键 词：逆变器 下垂控制 虚拟功角 虚拟同步机 暂态失稳 

分 类 号：TM464[电气工程—电器]