弱并网条件下VSC的自适应型虚拟并网点规划与控制策略  

Adaptive Virtual Access Point Planning and Control Strategy of VSC Under Weak Network Connection

作　　者：靳丹 陟晶 辛世金 杨建 黄亚飞 徐清 JIN Dan;ZHI Jing;XIN Shijin;YANG Jian;HUANG Yafei;XU Qing(State Grid Baiyin Power Supply Company,Baiyin 730900,Gansu,China;State Grid Gansu Electric Power Company,Lanzhou 730000,Gansu,China)

机构地区：[1]国网白银供电公司,甘肃白银730900 [2]国网甘肃省电力公司,甘肃兰州730000

出　　处：《电气传动》2024年第2期55-64,共10页Electric Drive

摘　　要：电压源换流器(VSC)接入薄弱交流电网时存在系统小扰动稳定性问题,传统控制策略下VSC不得不降低输出功率以维持稳定运行。为提升弱并网VSC的小扰动稳定性,首先基于交流电压外环建立了弱并网VSC稳定性机理的通用分析模型,分析了锁相环(PLL)与VSC外环控制间的耦合特性,及其对系统小扰动稳定性的影响机理。在此基础上,提出了一种参数自适应型虚拟并网点控制策略。在PSCAD/EMTDC环境下搭建的弱并网VSC详细开关模型验证了所提控制方法的有效性。Voltage source converter(VSC)connected to weak AC power grid has the risk of small disturbance instability.Under the traditional control strategy,VSC has to reduce output power to maintain stable operation.In order to improve the stability of the weak grid connected VSC system,first established a universal analysis model for revealing the stability mechanism of weak grid connected VSC based on the AC voltage outer loop,and revealed the influence of the coupling characteristics among the phaselocked loop(PLL)and the VSC outer loop control on system stability.On this basis,a parameter adaptive control strategy for virtual parallel point was proposed.The detailed switch model of VSC in the PSCAD/EMTDC environment verifies the effectiveness of the proposed control method.

关 键 词：电压源换流器 弱交流电网 小扰动稳定性 改进控制策略 

分 类 号：TM28[一般工业技术—材料科学与工程]