构网型与跟网型VSC的功率精确分配控制策略  

Precise Power Allocation Control Strategy for Grid Forming and Grid Following VSC

作　　者：陈艳霞 李菁 李鑫明 闻宇 CHEN Yan-xia;LI Jing;LI Xin-ming;WEN Yu(Beijing Electric Power Research Institute,Beijing 100075,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075

出　　处：《电力电子技术》2023年第2期117-120,共4页Power Electronics

基　　金：国网北京市电力公司科技项目(520223220001)。

摘　　要：针对构网型电压源变换器(VSC)与跟网型VSC并列运行时系统调节能力不足及功率分配效果差的问题,提出了一种构网型VSC与跟网型VSC的功率精确分配控制策略。首先,针对跟网型VSC传统PQ控制结构的缺点,提出了改进倒下垂控制方法,使得跟网型VSC在恒功率输出的基础上具备下垂调节特性,可与构网型VSC一起响应负载扰动,提高了系统调节能力和本地负载的供电可靠性,构网型VSC采用虚拟同步机(VSG)控制。其次,引入虚拟功率控制和虚拟阻抗控制,实现构网型VSC与跟网型VSC输出功率解耦及等效线路阻抗匹配。最后,利用实验平台对所提控制策略的有效性进行验证。In order to solve the problems of insufficient system regulation ability and poor power distribution effect when the grid forming voltage source converter(VSC) and the grid following VSC operate in parallel,a power accurate distribution control strategy for the grid forming VSC and the grid following VSC is proposed.Firstly,in view of the shortcomings of the traditional PQ control structure of the grid following VSC,an improved droop control method is proposed to make the grid following VSC have droop regulation characteristics on the basis of constant power output.It can respond to load disturbance together with the grid forming VSC,and improve the system regulation capacity and the power supply reliability of local loads.The grid forming VSC is controlled by virtual synchronous generator(VSG).Secondly,virtual power control and virtual impedance control are introduced to realize the decoupling of output power and the matching of equivalent line impedance between grid forming VSC and grid following VSC.Finally,the effectiveness of the proposed control strategy is verified based on experimental platform.

关 键 词：电压源变换器 下垂控制 虚拟功率控制 虚拟阻抗控制 

分 类 号：TM46[电气工程—电器]