摘要
针对背靠背柔性直流输电系统(voltage source converter based high voltage direct current,VSC-HVDC),提出一种惯量与阻尼模拟控制(inertiaanddampingemulationcontrol,IDEC)策略。在IDEC策略下,功率调节换流站(powerregulatingVSC,PR-VSC)通过改变其有功功率参考值来模拟同步发电机动态特性,而直流电压调节换流站(DCvoltage-regulating VSC,DR-VSC)则采用直流电压/频率下垂控制将该侧电网的频率无通信传输至PR-VSC,进而实现模拟惯量和阻尼所需的功率变化。为避免PR-VSCIDEC和DR-VSC IDEC控制器在两侧异步电网同时发生频率扰动时发生冲突,IDEC控制又嵌入了一种新型支撑模式选择算法,通过频率变化率的比较,有效地对IDEC支持模式进行优先级排序。文中通过小信号稳定性分析,优化IDEC控制器关键参数;通过控制器硬件在环实验,验证所提出的IDEC方案的有效性。结果表明,所提出的IDEC策略通过以惯量和阻尼模拟的形式增加异步交流系统的同步性,可有效促进异步互联交流系统在暂态过程中的互相支撑,整体增强了互联异步电网的频率稳定。
This paper proposed a novel inertia and damping emulation control(IDEC) strategy for a point-to-point voltage source converter based high voltage direct current(VSC-HVDC) system. It allows asynchronous AC grid synchronization in forms of inertial and damping responses provided to “both” sides of the VSC-HVDC interconnected grids, different from the historically-reported schemes only providing these responses to one grid. Under the IDEC scheme,the power-regulating VSC(PR-VSC) station emulated a synchronous generator directly through its active power control, whereas the DC-voltage-regulating VSC(DR-VSC)station employed a DC voltage/frequency droop control to convey its connected grid frequency communication-free to the remote PR-VSC for inertial and damping oriented power variations. To avoid the clash of the PR-VSC IDEC and DR-VSC IDEC under simultaneous frequency events on the asynchronous grids, a novel frequency support mode selection scheme was designed to effectively prioritize the IDEC support with a higher frequency gradient. The key parameters of the IDEC controller were optimized through small signal stability analysis. The effectiveness of the proposed IDEC scheme was verified through controller hardware-in-the-loop experiments.The results show that the proposed IDEC scheme effectively promotes synchronization and enhances overall frequency stability for the two interconnected asynchronous grids.
作者
朱介北
王晓南
俞露杰
刘娜
葛延峰
李霞林
王成山
ZHU Jiebei;WANG Xiaonan;YU Lujie;LIU Na;GE Yanfeng;LI Xialin;WANG Chengshan(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Nankai District,Tianjin 300072,China;State Grid Beijing Electric Power Company,Xicheng District,Beijing 100031,China;State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 110000,Liaoning Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第22期8089-8102,共14页
Proceedings of the CSEE
基金
国家自然科学基金面上项目(51977143)
国家电网有限公司总部科技项目:新能源高占比电网惯量评估与预警技术研究及应用(SGLNDK00XXJS2100008)。
关键词
频率响应
电力系统稳定性
柔性直流传输
功率控制
frequency response
power system stability
high voltage direct current(HVDC)transmission
power control
