弱惯量支撑电网自适应频率保护策略研究  

Research on Adaptive Frequency Protection Strategy for Power Grid with Weak Inertia Support

作　　者：常亚超 杨德友[1] Chang Yachao;Yang Deyou(School of Electrical Engineering,Northeast Electric Power University,Jilin Jilin 132012,China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电气自动化》2022年第6期36-39,共4页Electrical Automation

基　　金：国家自然科学基金项目(51877032)。

摘　　要：风电的持续发展带来了频率稳定性的一系列问题,对低频减载效果产生了重大影响,急需设计新的减载策略以适用于高比例风电的电网。首先,所提策略计算了系统故障后的功率缺额,在考虑典型的故障情况后获得计算功率缺额与实际功率缺额的最大计算误差。同时通过建立减载贡献因子确定减载地点及容量,最终确定低频减载策略。仿真结果表明,所提减载策略能使系统频率快速恢复到安全运行的稳态频率,减载效果良好。所提低频减载策略可以更好应用于高比例风电系统,有效提高频率恢复水平。The continuous development of wind power has brought a series of problems of frequency stability,which has a significant impact on the effect of low-frequency load shedding.It is urgent to design a new load shedding strategy to be suitable for power grids with a high proportion of wind power.Firstly,the strategy proposed calculateed the power deficit after system failure.The maximum calculation error between the calculated power deficit and the actual power deficit after considering typical fault conditions was obtained.At the same time,the location and capacity of load shedding were determined by establishing the contribution factor of load shedding,and the low-frequency load shedding strategy was finally determined.The simulation results show that the proposed load shedding strategy can quickly restore the system frequency to the steady-state frequency of safe operation,and the load shedding effect is good.The proposed low frequency load shedding strategy can be better applied to high proportion wind power system and effectively improve the level of frequency recovery.

关 键 词：低频减载 自适应 功率缺额 弱惯量 风电并网 

分 类 号：TM712[电气工程—电力系统及自动化]