摘要
随着大规模风电/光伏并网、高压直流输电与柔性交流输电在输送通道中的建设及基于电力电子接口负荷的增长,电力系统特征趋向电力电子化,电力电子化电力装备的特性使得电力系统振荡展现出宽频化的特征,如何抑制系统中的高频振荡成为电力系统安全稳定运行面临的新挑战。并网变换器具备灵活的调节特性,通过优化其动态特性,可提高系统安全稳定运行的能力。这里提出利用锁相原理辨识出系统失稳时并网变换器输出电流的振荡分量,并将该分量叠加至电流控制输出端,使变换器并网动态特性随系统振荡频率的变化而自适应调节,从而实现对系统中高频振荡的有效抑制。基于Matlab/Simulink平台构建了对应的时域仿真分析模型,仿真与实验结果验证了理论分析的有效性。
With the integration of large-scale wind power/photovoltaic generations,the applying of high-voltage direct current transmission and flexible alternating current transmission in the power grid and the growth of power electronic interface load,the characteristics of power systems tend to become more power-electronized,and the characteristics of power electronic equipment make the system oscillations cover a wider frequency band.To suppress the medium and high frequency oscillation becomes a new challenge for the safe and stable operation of the power system.The gridconnected voltage source converter has flexible regulation characteristics,and by optimizing its dynamic characteristics,it can improve the safe and stable operation capability of power systems.An adaptive control branch which is based on the phase-locking principle is added to the current control loop to optimize the dynamic characteristics of the grid-connected converter.By optimizing the dynamic characteristics of the grid-connected converter,the medium and high frequency oscillation in power system can be effectively suppressed.Time-domain simulation of a case system implemented in Matlab/Simulink validate the correctness of analysis and the effectiveness of the proposed control strategy.
作者
严亚兵
朱维钧
徐浩
李辉
YAN Ya-bing;ZHU Wei-jun;XU Hao;LI Hui(State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410007,China)
出处
《电力电子技术》
CSCD
北大核心
2020年第6期103-107,共5页
Power Electronics
基金
国家电网有限公司科技项目(5216A019000Y,5216A218000N)。
关键词
并网变换器
中高频振荡
电流控制
grid-connected converter
medium and high frequency oscillation
current control
