不平衡条件下柔性配电网SOP故障穿越控制策略

The SOP Fault Traversal Strategy for Flexible Distribution Networks under Imbalance Conditions

中文关键词:故障穿越  柔性电力电子开关  柔性互联配电网  不对称故障

keywords:low voltage ride-through  soft open point  flexible interconnected distribution net-work  asymmetrical faults

中文摘要:电力电子设备的故障穿越（low voltage ride-through，LVRT）能力是保证电网故障后供电可靠性的基础，已成为当前的研究热点。以基于柔性电力电子开关（soft open point，SOP）的柔性互联配电网（flexible interconnected distribution net-work，FIDN）为对象，研究了不平衡工况下柔性互联配电网的SOP故障穿越策略研究。介绍了FIDN的典型架构，并详细分析了FIDN在不对称故障下的并网功率特性。深入探究了SOP功率补偿与阻抗间的耦合关系。针对SOP不平衡条件下的故障穿越问题，提出了考虑三相电流平衡的SOP低电压穿越控制策略，并在仿真平台上验证。结果表明，所提控制策略能够有效提高FIDN中SOP在不对称故障下的故障穿越能力。

Abstract:The low voltage ride-through （LVRT） capability of power electronic equipment is fundamental to ensuring the reliability of power supply during grid faults and has become a current research hotspot. Focuses on the flexible interconnected distribution network （FIDN） based on flexible power electronic switches （soft open point， SOP） and investigates the SOP fault ride-through （FRT） strategies under unbalanced conditions. The paper introduces the typical architecture of FIDN and analyzes in detail the grid-connected power characteristics of FIDN during asymmetric faults. It delves into the coupling relationship between SOP power compensation and impedance. To address the FRT issue under unbalanced conditions of SOP， Proposes an LVRT control strategy for SOP that considers three-phase current balance， which is validated on a simulation platform. The results indicate that the proposed control strategy can effectively enhance the FRT capability of SOP in FIDN during asymmetric faults.