考虑直流侧响应的VSC-MTDC系统协调控制  

Coordinated control of VSC-MTDC system considering DC-side response

作　　者：陈迅 郭敬梅 曾德辉[2] 张健 黄辉 CHEN Xun;GUO Jingmei;ZENG Dehui;ZHANG Jian;HUANG Hui(Electric Power Research Institute of Guangdong Power Grid Corporation,Guangzhou 510080,China;School of Electric Power,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080 [2]华南理工大学电力学院,广东广州510640

出　　处：《电力自动化设备》2018年第12期174-180,共7页Electric Power Automation Equipment

基　　金：中国博士后科学基金面上项目(2016M602436)~~

摘　　要：针对功率参考指令经常发生变化的基于电压源型换流器的多端直流输电(VSC-MTDC)系统的控制问题,提出了一种考虑直流侧响应的VSC-MTDC系统协调控制方法。建立了计及有功平衡的标幺值状态空间模型,其可进行系统的稳定性分析,并能反映直流侧的响应过程;基于该模型,提出了下垂系数和公共电压参考值的修正方法,可同时实现直流网络不平衡功率的合理分配和电压调整,且能够保证系统的稳定性;在PSCAD/EMTDC仿真平台上进行仿真,结果表明了所提方法的有效性。To address the control problem of VSC-MTDC(Voltage Source Converter based Multi-Terminal Direct Current)system with time-variable power reference commands,a coordinated control method of VSC-MTDC system considering DC-side response is proposed. Firstly,a per-unit state space model with the active power balance is formulated,based on which the system stability analysis is performed,and DC-side responses are indicated. Secondly,a modified method for droop coefficients and the common voltage reference is presented which can simultaneously contribute to a reasonable distribution of the unbalanced power flows and the voltage regulation in DC networks. In addition,the system stability can be ensured using this approach. Finally,experiments are carried out on PSCAD /EMTDC,and the results demonstrate the validity of the proposed method.

关 键 词：基于电压源型换流器的多端直流输电 协调控制 下垂控制 状态空间模型 稳定性 

分 类 号：TM721.1[电气工程—电力系统及自动化]