摘要
对于连接低惯量交流系统的多端柔性直流输电(VSC-MTDC)系统,当系统发生大扰动时会造成频率变化,为了给交流系统提供虚拟惯量,在换流器控制系统中加入P-?下垂控制;为了进一步抑制频率波动,设计VSC-MTDC系统的自适应下垂控制,可以在更大程度上利用换流器容量,快速调节有功平衡,减小直流电压波动。在PSCAD/EMTDC仿真软件中建立三端模型,对比分析主从控制、下垂控制和自适应下垂控制对交流系统频率和直流电压的影响。仿真结果表明,加入了P-?下垂控制可以有效抑制交流系统频率变化,采用自适应下垂控制可以增强抑制的效果,减小直流电压波动,提高系统稳定性。
As for the VSC-MTDC( Voltage Source Converter based Multi-Terminal Direct Current) system connected to low inertia AC system,the frequency of the system may fluctuate when large disturbances happen. Therefore,the P-f droop control is introduced in the converter control to supply virtual inertia for AC system. In order to further suppress the frequency fluctuation,an adaptive droop control for VSC-MTDC is designed. This control method can take advantages of converter capacity to a large extent,adjust active power quickly and reduce DC voltage variation.Additionally,a three-terminal model is built in the PSCAD/EMTDC software to compare and analyze the impacts on frequency and DC voltage of master-slave control,P-? droop control and adaptive droop control. The simulative results show that the droop control based on P-f curve can suppress the frequency fluctuation effectively and the adaptive droop control can reinforce the suppression effect and decrease the voltage variation so as to improve the power system stability.
作者
翟冬玲
韩民晓
马骏鹏
王鹏
ZHAI Dongling;HAN Minxiao;MA Junpeng;WANG Peng(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University,Beijing 102206,China;New Energies Sources Co.,Ltd.of China Power Engineering Consuhing Group,Beijing 100120,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第2期128-134,共7页
Electric Power Automation Equipment
基金
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)
国家留学基金委资助项目(2017067-30048)~~
