弱电网下VSC型电力电子设备外环增强阻尼控制策略  

Outer-loop Improved Damping Control Strategy for Weak Grid-tied VSC Devices

作　　者：王姗姗 赵兵 吴广禄 李建华 曹路 马全 王铁柱 周孝信 WANG Shanshan;ZHAO Bing;WU Guanglu;LI Jianhua;CAO Lu;MA Quan;WANG Tiezhu;ZHOU Xiaoxin(State Key Laboratory of Power Grid Safety and Energy Conservation(China Electric Power Research Institute),Haidian District,Beijing 100192,China;East China Branch of State Grid Corporation of China,Huangpu District,Shanghai 200002,China)

机构地区：[1]电网安全与节能国家重点实验室(中国电力科学研究院有限公司),北京市海淀区100192 [2]国家电网有限公司华东分部,上海市黄浦区200002

出　　处：《电网技术》2022年第1期185-194,共10页Power System Technology

基　　金：国家电网有限公司华东分部科技项目(No.XTB11202001216):“混合级联多端特高压直流馈入受端电网仿真和运行控制关键技术(电磁暂态仿真和运行控制)”。

摘　　要：宽频振荡是高比例新能源电力系统中的一个重要问题,截至目前,振荡的分析和抑制仍然是研究热点。首先,基于电压源型换流器(voltage source converter,VSC)接入弱交流电网时的单输入单输出(single-inputsingleoutput,SISO)传递函数模型,分析了低频振荡频率的影响因素和振荡阻尼特性;其次,提出了一种基于积分重置控制的外环增强阻尼控制策略,通过补偿锁相环(phase-locked loop,PLL)在弱电网下引起的相位滞后来提高VSC接入弱电网时的阻尼和系统稳定性,并提出了基于灵敏度分析的参数选择方法;最后通过时域仿真和RTDS仿真验证了提出的增强阻尼控制器的有效性。Wide frequency oscillation is an important issue in the power systems based on new energy resources. Up till now, the analysis and suppression of the oscillations are still hot topics for the researchers. First, based on the single input/single output transfer function model of the weak grid-tied voltage source converter(VSC), the impact factors and damping characteristics of the low-frequency oscillation frequency are analyzed. Then, an outer-loop improved damping control strategy based on the integrator reset control is proposed to increase the damping and the stability of the weak grid-tied VSC system by compensating the phase locked loop(PLL)’s phase delay in the weak grid condition. Also, a sensitivity analysis based parameter selection method is presented. Finally, the effectiveness of the outer-loop improved damping control is validated through the time-domain simulation and the real time digital simulation(RTDS)experiments.

关 键 词：弱电网 单输入单输出传递函数 锁相环 外环增强阻尼控制 

分 类 号：TM721[电气工程—电力系统及自动化]