考虑多机耦合的新能源并网变流器故障穿越安全可控边界分析

荣秀婷; 杨桂森; 张小奇; 魏平; 徐梓高; 贾科

doi:10.19912/j.0254-0096.tynxb.2025-0656

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太阳能学报 ›› 2026, Vol. 47 ›› Issue (9) : 460-472. DOI: 10.19912/j.0254-0096.tynxb.2025-0656

考虑多机耦合的新能源并网变流器故障穿越安全可控边界分析

荣秀婷¹, 杨桂森², 张小奇¹, 魏平¹, 徐梓高², 贾科²

作者信息 +

ANALYSIS ON SAFE CONTROLLABLE BOUNDARY OF RENEWABLE ENERGY GRID-CONNECTED CONVERTERS DURING FAULT RIDE-THROUGH CONSIDERING MULTI-CONVERTER COUPLING

Rong Xiuting¹, Yang Guisen², Zhang Xiaoqi¹, Wei Ping¹, Xu Zigao², Jia Ke²

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文章历史 +

摘要

以光伏、直驱风力发电机等全功率型新能源并网变流器为研究对象,推导故障穿越期间变流器注入正、负序无功电流的安全可控边界。通过分析变流器注入无功电流与可控边界间的耦合作用,提出考虑耦合影响的可控边界迭代计算方法,提升边界计算的准确性。在此基础上针对变流器器件的电气应力极限、故障类型、电网强度等因素对可控边界的影响规律进行分析,为故障穿越期间变流器的无功电流指令提供设计依据。最后依托Matlab/Simulink仿真平台,验证该可控边界计算方法的有效性和准确性。

Abstract

Renewable energy grid-connected converters are rapidly increasing in single-unit capacity and power generation share. After short-circuit faults occur, renewable energy systems without synchronous power sources rely on converters to actively inject reactive power to support grid voltage. However, the reactive power regulation range of the grid-connected converters during fault ride-through is affected by various factors including equipment electrical stress constraints and fault types. This range varies continuously during current injection, which may cause the converters to go off-grid when the injected current exceeds the safe controllable boundary. This paper takes full-power renewable energy grid-connected converters such as photovoltaic and direct-drive wind turbines as the research objects, and derives the safe controllable boundaries for converters to inject positive and negative sequence reactive currents during fault ride-through. By analyzing the coupling relationship between injected reactive current and the controllable boundaries, an iterative calculation method for the controllable boundaries considering coupling effects is proposed to improve calculation accuracy. On this basis, this paper analyzes the influence law of the electrical limit of the converter device, fault type, grid strength and other factors on the controllable boundaries, which can provide a design basis for the reactive current references of converters during fault ride-through. Finally, the effectiveness and accuracy of the proposed controllable boundary calculation method are verified by the Matlab/Simulink simulation platform.

导出引用

荣秀婷, 杨桂森, 张小奇, 魏平, 徐梓高, 贾科. 考虑多机耦合的新能源并网变流器故障穿越安全可控边界分析[J]. 太阳能学报. 2026, 47(9): 460-472 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0656

Rong Xiuting, Yang Guisen, Zhang Xiaoqi, Wei Ping, Xu Zigao, Jia Ke. ANALYSIS ON SAFE CONTROLLABLE BOUNDARY OF RENEWABLE ENERGY GRID-CONNECTED CONVERTERS DURING FAULT RIDE-THROUGH CONSIDERING MULTI-CONVERTER COUPLING[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 460-472 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0656

中图分类号： TM46

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