电力系统自动化2025，Vol.49Issue(22)：44-54,11.DOI:10.7500/AEPS20241225006
电网频率跌落下基于功角增量的构网型逆变器限流策略
Current-limiting Strategy of Grid-forming Inverter Based on Power Angle Increment Under Power Grid Frequency Drop
摘要
Abstract
Grid-forming(GFM)inverters effectively alleviate the issues of low inertia and weak grid stability caused by increasing renewable energy penetration.However,the virtual inertia of the GFM inverter may induce overcurrent during the power grid frequency drop.To address this issue,based on the power angle variation during the frequency drop,this paper reveals that the power angle increment between the GFM inverter and the power grid is the dominant factor causing the GFM inverter overcurrent during the power grid frequency drop,and a current-limiting strategy is required to avoid the overcurrent.To prevent repeated switching of the current-limiting strategy and achieve fast overcurrent protection,this paper proposes a switching logic based on an event-triggered SR latch.This method utilizes the event-triggered logic to respond to overcurrent events in real time,thereby achieving fast overcurrent protection.Then,an adaptive frequency tracking strategy based on power angle increment is proposed,and the virtual impedance is adaptively calculated based on the residual power angle increment in the initial phase of overcurrent.The proposed method not only suppresses the overcurrent during power grid faults,enhances the synchronous stability of the system,but also has fault recovery ability.In addition,the bandwidth analysis of the closed-loop transfer function of the adaptive frequency tracking strategy demonstrates that this strategy has good compatibility.Finally,simulation and experimental results verify the effectiveness and accuracy of the proposed method.关键词
构网型逆变器/频率跌落/惯性/限流/功角增量/频率追踪/虚拟阻抗/过流保护Key words
grid-forming(GFM)inverter/frequency drop/inertia/current-limiting/power angle increment/frequency tracking/virtual impedance/overcurrent protection引用本文复制引用
王顺亮,陈亚龙,马俊鹏,涂皓,史华勃,滕予非..电网频率跌落下基于功角增量的构网型逆变器限流策略[J].电力系统自动化,2025,49(22):44-54,11.基金项目
智能电网国家科技重大专项资助项目(2024ZD0801600). This work is supported by Smart Grid-National Major Science and Technology Project(No.2024ZD0801600). （2024ZD0801600）
