文章摘要
罗晨曦,徐政,陆韶琦.联接弱同步支撑系统的电压源换流器优化矢量控制策略[J].电力系统自动化. DOI: 10.7500/AEPS20180126002.
LUO Chenxi,XU Zheng,陆韶琦.Extended Control Strategies of VSC Stations Linked to Converter Dominated Systems[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180126002.
联接弱同步支撑系统的电压源换流器优化矢量控制策略
Extended Control Strategies of VSC Stations Linked to Converter Dominated Systems
DOI:10.7500/AEPS20180126002
关键词: 矢量控制  附加控制环节  无源网络  系统稳定性  VSC-HVDC
KeyWords: vector control  VSC-HVDC  feedback property  converter dominated  system stabilization
上网日期:2018-09-14
基金项目:
作者单位E-mail
罗晨曦 杭州 玉泉 浙江大学电机系 562370811@qq.com 
徐政 杭州 玉泉 浙江大学电机系 xuzheng007@zju.edu.cn 
陆韶琦 杭州 玉泉 浙江大学电机系 sqlu@zju.edu.cn 
摘要:
      考虑到现有电压源换流器几乎全部采用矢量控制策略,为克服其在接入弱同步支撑系统中的失稳问题,优化了电压源换流器的矢量控制策略。首先分析了矢量控制在无源网络供电时的失稳机理,得到换流器孤立运行时失稳的原因。其次根据该机理,将系统频率偏差作为附加控制环节引入矢量控制器中,使改进后的控制策略能够应对有源系统中电源的切出,改善了系统的稳定性。最后仿真验证了这种优化控制策略在电压源换流站连于弱电网时的动态响应与虚拟同步机类似,提高了系统的阻尼比,并且能够给无源网络供电。
Abstract:
      In order to overcome the instability problem when voltage source converters access to weak synchronous support system which adopt vector control strategy, a optimized vector control strategy is proposed. Firstly, the instability mechanism of vector control in power supply of passive network is analyzed, and the reason of instability of converters in isolated operation is obtained. Secondly, according to this instability mechanism, the frequency in SRF-PLL is introduced into the vector controller as an additional control element, so that the improved control strategy can deal with the power cut in the active system and improves the stability of the system. Finally, the simulation verifies that the dynamic response of the optimal control strategy when the voltage source converter is connected to the weak network is similar to that of the virtual synchronous machine, which improves the damping ratio of the system and can supply the passive network.
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