基于主动支撑型VSCs的新能源电网惯量调控与特性分析  

Inertia Control and Characteristics Analysis of Renewable Power Grid Based on Active Support VSCs

作　　者：张艳军 闫玉恒 李斌 刘闯[2] 蔡国伟[2] 谢禹 ZHANG Yanjun;YAN Yuheng;LI Bin;LIU Chuang;CAI Guowei;XIE Yu(State Grid Liaoning Electric Power Co.Ltd.,Shenyang 110006,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;State Grid Jiangxi Fuzhou Power Supply Company,Fuzhou 344000,China)

机构地区：[1]国网辽宁省电力有限公司,辽宁沈阳110006 [2]东北电力大学电气工程学院,吉林吉林132012 [3]国网江西抚州供电分公司,江西抚州344000

出　　处：《智慧电力》2020年第4期55-61,76,共8页Smart Power

基　　金：国家重点研发计划资助项目(2016YFB0900100);国家电网公司科技项目(2018YF-25)。

摘　　要：随着新能源渗透率的不断增加,电网的惯量水平和一次调频能力不断下降,导致系统鲁棒性降低。传统电网惯量由同步发电机的旋转大轴提供,为固定不变的刚性惯量,而主动支撑型电压源型变流器(VSC)具有惯量柔性调控特性,可灵活调控系统惯量中心偏向功率扰动点,以提高区域电网的频率稳定。首先推导了2区互联系统的惯量中心点位置,其次介绍了具有同步发电机惯量特性的VSC主动支撑控制策略,最后利用主动支撑型VSC惯量柔性调控特性,调节惯量中心点向功率扰动点偏移,削弱不平衡功率对系统频率的冲击,从而提高系统的鲁棒性。在DIgSILEN/PowerFactory仿真环境中搭建4机2区系统验证了结论的准确性。With the continuous increase of the renewable energy penetration rate,the inertia level of the power grid and the ability of the primary frequency control continue to decrease,resulting in a decrease in system robustness.The traditional grid inertia is provided by the rotating large shaft of the synchronous machine,which is a constant rigid inertia.The active support voltage source converter(VSC)has flexible inertia control characteristics,which can flexibly regulate the system inertia center to the power disturbance point to increase the frequency stability of the regional grid.Firstly,the position of inertia center point under two-areas interconnected system is derived.Then the VSC active support control strategy with synchronous generator inertia characteristics is introduced.Finally,the active support VSC inertia flexible control characteristics are used to adjust the position of inertia center to the power disturbance point,which reduces the impact of unbalanced power on the system frequency,thereby improving the robustness of the system.The accuracy of the conclusion is verified by the four-machine two-areas system built in the DIgSILENT/PowerFactory simulation platform.

关 键 词：主动支撑 惯量中心 频率响应 功率波动 

分 类 号：TM715[电气工程—电力系统及自动化]