| 引用本文: | 张 圣,杨炳元,宫子媛,等.风光火储打捆接入柔直交流侧送出线路故障特征分析[J].电力系统保护与控制,2025,53(4):120-131. |
| ZHANG Sheng,YANG Bingyuan,GONG Ziyuan,et al.Fault characteristic analysis on the AC side of an MMC-HVDC transmission system connected to a wind-PV-thermal-energy storage system[J].Power System Protection and Control,2025,53(4):120-131 |
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| 摘要: |
| 风光火储打捆外送采用交流汇集、高压柔性直流输电、交流接入电网的方式。其中，交流送出线路发生短路故障将产生新的故障特征。首先，结合风光火储侧和柔直侧的故障穿越控制策略分析了故障电流特征。当电压跌落至0.2~0.9 p.u.范围内时，通过理论推导，明确了交流送出线路两侧故障电流相角受电压跌落程度和限幅环节上限控制的机理。结合相量分析，揭示了风光火储侧故障电流相角小于75°，柔直侧小于45°的规律。借助于故障序网分析了接地故障和相间故障下的故障电流幅值特征。其次，从短路比视角出发并利用戴维南等值法，探究了火电接入增大系统短路容量导致故障电流相角减小的原因。此外，分析了风光储故障电流幅值随输入功率成正比例变化的特征。最后，通过RTDS仿真平台建模验证了理论分析的正确性。 |
| 关键词: 风光火储 柔性直流输电 跟网型 交流故障 故障特征分析 |
| DOI：10.19783/j.cnki.pspc.240572 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52367022)；内蒙古自治区自然科学基金项目资助(2023LHMS05049) |
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| Fault characteristic analysis on the AC side of an MMC-HVDC transmission system connected to a wind-PV-thermal-energy storage system |
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ZHANG Sheng1, YANG Bingyuan1, GONG Ziyuan2, BAO Hongfeng1
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1. School of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Inner Mongolia Electric Power Economic Research Institute, Hohhot 010090, China
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| Abstract: |
| A wind-PV-thermal-energy storage system (WPTESS) is bundled and transmitted using AC collection, MMC-HVDC transmission, and AC grid connection. Among them, short-circuit faults at the AC sending line will generate new fault characteristics. Firstly, the fault current characteristics are analyzed by combining the fault ride-through control strategies of the WPTESS and MMC-HVDC. When the voltage drops to a range between 0.2 p.u. and 0.9 p.u., the mechanism by which the fault current phase angle on both sides of the AC sending line is affected by the degree of voltage drop and the upper limit control of the amplitude limiting link is clarified through theoretical derivation. Using phasor analysis, it is revealed that the fault current phase angle on the WPTESS side is less than 75°, and on the MMC-HVDC side is less than 45°. The fault current amplitude characteristics under grounding faults and phase-to-phase faults are analyzed using fault sequence network. Secondly, considering the short-circuit ratio and using Thevenin’s equivalent method, the reasons for the reduction of fault current phase angle due to the increase in system short-circuit capacity caused by thermal power integration are explored. In addition, the characteristics of the fault current amplitude of a wind-PV-energy storage system varying proportionally with input power are analyzed. Finally, the correctness of the theoretical analysis is verified through RTDS simulation. |
| Key words: wind-PV-thermal-storage system MMC-HVDC grid-following AC fault fault characteristics analysis |
