VSC-HVDC受端换流器参与电网调频的VSG控制及其改进算法

发布时间：2018-04-15 05:15

本文选题：VSC-HVDC + 受端换流器　；参考：《中国电机工程学报》2017年02期

【摘要】：为提高柔性直流输电(voltage source converter basedHVDC,VSC-HVDC)受端系统频率的稳定性,同时确保直流系统发生故障或扰动下的可靠运行,提出受端换流器参与电网调频的虚拟同步发电机(virtual synchronous generator,VSG)控制及具有直流电压协调控制能力的VSG改进算法。首先,分析指出大容量VSC-HVDC受端换流器常规控制方式会降低系统频率稳定性,因此有必要通过合理的控制手段参与频率调节;其次,研究了使受端换流器具有惯性响应特性和一次调频能力的VSG控制技术;之后结合直流系统对运行可靠性的基本要求,将直流电压协调控制功能引入VSG技术中得到改进算法;最后,通过Matlab/Simulink构建了三端系统进行仿真。结果表明:VSC-HVDC受端换流器使用VSG控制能有效改善受端交流系统频率暂、稳态性能;VSG改进算法则能进一步提高直流系统运行可靠性。
[Abstract]:In order to improve the stability of the frequency of the VSC-HVDC receiver system of the source source converter based HVDC, and to ensure the reliable operation of the DC system under fault or disturbance,This paper presents an improved VSG algorithm for virtual synchronous generator (VSGG) control and DC voltage coordination control of virtual synchronous generator (VSGG) in which the terminal converter participates in the power system frequency modulation.Firstly, it is pointed out that the conventional control mode of the large capacity VSC-HVDC terminal converter will reduce the frequency stability of the system, so it is necessary to take part in the frequency regulation through reasonable control methods.The VSG control technology with inertial response and primary frequency modulation is studied, and then the DC voltage coordination control function is introduced into the VSG technology in accordance with the basic requirements of the DC system for operational reliability.Finally, a three-terminal system is constructed by Matlab/Simulink to simulate.The results show that the VSG control can effectively improve the transient frequency of the receiver AC system, and the steady-state performance can improve the reliability of the DC system.
【作者单位】：许继集团有限公司;西安许继电力电子技术有限公司;
【分类号】：TM721

【相似文献】