摘要
将电压源型高压直流输电(VSC-HVDC)两端节点等效为两个有源节点,推导得到VSC-HVDC两端等效节点注入电流的表达式,从而可以方便地通过修改系统导纳矩阵,得到含VSC-HVDC系统的数学模型。在该模型的基础上,考虑VSC内部电流环和系统控制要求,提出了一种新的VSC-HVDC控制策略。以一个含VSC HVDC的6机电力系统为例,仿真表明,采用该控制策略,在系统发生大扰动后,VSC HVDC不仅能够迅速恢复正常运行,而且对系统电压和频率稳定没有太大影响。
The injection current expressions of voltage sourced converters (VSC) based HVDC (VSC-HVDC) are derived, in which two terminals of VSC-HVDC are regarded as active nodes, thus the equivalent mathematical models for a multi-machine system with VSC-HVDC can be conveniently obtained by revising the system admittance matrix. With the inner current loop and system control requirements taken into account, a novel control strategy for VSC-HVDC is proposed based on the model obtained. As an example, a six-machine power system with VSC-HVDC is simulated. The simulation results demonstrate that the VSC-HVDC using the proposed control strategy can quickly recover from system fault without negative influences on the frequency and voltage stability of the AC system.
出处
《电力系统自动化》
EI
CSCD
北大核心
2005年第1期39-44,共6页
Automation of Electric Power Systems
基金
教育部优秀青年教师资助计划项目。
关键词
多机电力系统
电压源型高压直流输电
模型
电力系统控制
频率稳定
电压稳定
multi-machine power system
expressions of voltage sourced converters based HVDC
model
power system control
frequency stability
voltage stability
