逆变器电压源化运行时的限流工作模式分析及控制策略设计  

Analysis and Control Strategy Design of Current Limiting Operation Mode for Inverter Voltage Source Operation

作　　者：吴婧婷 张伟[1] 彭英杰 王振雄[1] 杨泽斌 易皓[1] 卓放[1] WU Jingting;ZHANG Wei;PENG Yingjie;WANG Zhenxiong;YANG Zebin;YI Hao;ZHUO Fang(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《电网与清洁能源》2025年第4期18-26,共9页Power System and Clean Energy

基　　金：陕西省自然科学基础研究计划(2023-JC-QN-0434)。

摘　　要：随着电网新能源渗透率的不断上升,部分地区配电网电压极易被扰动,电网强度下降。当逆变器在电压源模式工作模式下,可以提升并网特性,在弱电网下起到主动支撑的作用。此时,逆变器的电流控制能力下降,在大功率负载投切时易出现过电流问题,需要采取限流措施。然而,对电压源运行的逆变器限流时,可能引起电压失同步,产生失稳、脱网风险。提出一种用于逆变器电压源化运行时的限流控制策略,以下垂控制的电压源型工作模式为例,分析其输出电流受限时的功角关系和失同步的原因。通过相角切换改善逆变器输出电流受限时的同步性,提高了逆变器电压源化运行时的工作性能,提升了变流器在弱电网中的主动支撑能力。As the integration of renewable energy into power grids increases,voltage disturbances and grid power weakening become apparent.Operating in voltage source mode can enhance system properties in scenarios where an inverter is connected to a weak grid.However,this operational mode tends to diminish the inverter's capacity for current regulation.Switching on large loads can result in overcurrent issues,necessitating the implementation of robust current limiting control measures.However,current-limiting strategies might destabilize the system,risking instability and disconnection from the grid.In light of these challenges,this study introduces a novel current-limiting control strategy tailored for the voltage source operation of inverters.Using droop control as a case study,it delves into the dynamics of power angle relationships.The integration of an advanced current limiter aims to circumvent the risk of desynchronization,thereby boosting operational efficiency.This approach significantly contributes to enhancing the converter’s active support functions within a weak grid framework.

关 键 词：逆变器 限流控制 电压源模式逆变器 构网控制 相角切换控制策略 

分 类 号：TM464[电气工程—电器]