The fault analysis method of islanded microgrid based on the U/f and PQ control strategy,International Transactions on Electrical Energy Systems

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The fault analysis method of islanded microgrid based on the U/f and PQ control strategy
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2021-04-27 , DOI: 10.1002/2050-7038.12919
Zihao Wang ₁ , Longhua Mu ₁ , Yanchang Xu ₁ , Fan Zhang ₁ , Jiran Zhu ₁

Affiliation

The fault calculation of microgrid is an important method for fault characteristic analysis. The traditional fault analysis methods ignore the connection of inverter interfaced distributed generation (IIDG) and are not suitable for microgrids. A new fault analysis method suitable for the master-slave controlled microgrid is proposed in this article, which considers the control strategy of IIDGs, low voltage ride through (LVRT) and the fault current limiting. The fault models of PQ-controlled IIDG (PQ-IIDG) and U/f-controlled IIDG (U/f-IIDG) are analyzed, then an equivalent Norton model of microgrid is established, and a new fault calculation method is presented. By analyzing the fault models, the working state of U/f-IIDG is divided into a constant voltage state and a constant current state. In the constant voltage state, a grid-connected microgrid fault calculation method is adopted. In the constant current state, the improved nodal voltage equation based on the current limiting is adopted. Without complicated calculation, high precision results can be obtained after simple iterative calculation. The results of the microgrid simulation model established in PSCAD/EMTDC and the fault calculation method programmed on MATLAB are compared to verify the effectiveness and accuracy of the proposed fault analysis method.

中文翻译：

基于U/f和PQ控制策略的孤岛微电网故障分析方法

微电网故障计算是故障特征分析的重要方法。传统的故障分析方法忽略了逆变器接口分布式发电（IIDG）的连接，不适用于微电网。综合考虑IIDG的控制策略、低电压穿越（LVRT）和故障限流，提出了一种适用于主从控制微电网的故障分析新方法。分析了PQ控制的IIDG(PQ-IIDG)和U/f控制的IIDG(U/f-IIDG)的故障模型，建立了微电网的等效诺顿模型，提出了一种新的故障计算方法。通过对故障模型的分析，将U/f-IIDG的工作状态分为恒压状态和恒流状态。在恒压状态下，采用并网微网故障计算方法。在恒流状态下，采用基于限流的改进节点电压方程。无需复杂的计算，通过简单的迭代计算即可获得高精度的结果。将PSCAD/EMTDC建立的微电网仿真模型与MATLAB编程的故障计算方法的结果进行对比，验证了所提出的故障分析方法的有效性和准确性。

更新日期：2021-07-02

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