计及控制切换延时及电压跌落检测影响的逆变型新能源电源故障暂态电流解析计算  

Analytical Calculation of Fault Transient Current of IIREG Considering the Effects of Control Switching Delay and Voltage Drop Detection

作　　者：郑涛 陈颖 李紫肖 艾静雯 周泽昕 王兴国 ZHENG Tao;CHEN Ying;LI Zixiao;AI Jingwen;ZHOU Zexin;WANG Xingguo(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2025年第4期1569-1578,I0004,共11页High Voltage Engineering

基　　金：国家自然科学基金(U2166205)。

摘　　要：目前针对逆变型新能源故障特性的研究均认为故障后电压外环立即闭锁,忽略了低电压穿越控制切换延时及电压跌落检测的影响,因此与实际的电流波形存在一定的误差。针对该问题,首先分析了电压跌落幅值检测模块导致低电压穿越控制延时投入的机理,然后基于电压暂态变化过程,将故障电流全过程明确划分为4个阶段,重点针对电流参考值变化的暂态第2阶段,基于“区间分段”的思想对故障电流分段线性化计算,最终建立起计及控制切换延时及电压跌落检测影响的故障暂态分阶段的电流解析计算模型。所提故障电流解析计算波形与MATLAB/Simulink的仿真波形基本相符,验证了所提故障电流解析计算模型的准确性与有效性,可为后续逆变型新能源并网系统的继电保护适应性与新原理的研究提供参考。The current studies on the fault characteristics of inverter-based new energy sources all consider that the voltage outer ring is blocked immediately after faults,ignoring the influences of the switching delay of low-voltage ride-through(LVRT)control and the voltage dip detection,thus there is a certain error with the actual current waveform.To address this problem,the mechanism of the voltage dip amplitude detection module leading to the LVRT control delay input is first analyzed.Then based on the voltage transient change process,the whole process of fault current is clearly divided into four stages.This paper focuses on the second stage of the transient current reference value change,and based on the idea of“interval segmentation”,the fault current is linearized in segments;finally,a fault transient current analytical calculation model is established,which considers the influences of the control switching delay and voltage dip detection.The waveforms of the proposed fault current analytical calculation basically match with the simulation waveforms of MATLAB/Simulink,which verifies the accuracy and validity of the proposed fault current analytical calculation model,and provides a reference for the subsequent research on the adaptability of relay protection and the new principle of the inverter-type new energy grid-connected system.

关 键 词：逆变型新能源电源 低电压穿越 电压跌落检测 控制切换延时 对称故障 暂态电流分阶段建模 

分 类 号：TM464[电气工程—电器]