Calculation Method and Characteristic Analysis for Fault Current of Permanent Magnet Direct-Drive Wind Power System considering Positive and Negative Sequence Decomposition

IF 1.9 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC International Transactions on Electrical Energy Systems Pub Date : 2024-02-20 DOI:10.1155/2024/2794393
Botong Li, Qing Zhong, Weijie Wen, Bin Li, Xiaolong Chen
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Abstract

In view of the fact that the influence of positive and negative sequence decomposition, which is widely used in positive and negative sequence decoupling control in control system, on the fault current calculation process is not deeply considered in the existing transient analysis methods of permanent magnet direct-drive wind farm short circuit current, this paper proposes a transient short circuit current calculation model that takes into account positive and negative sequence decomposition. The influence of the transient characteristics of positive and negative sequence decomposition on the control system is studied, and the mechanism of its action on the transient change of short circuit current is revealed. The positive and negative sequence decoupling processes of the circuit equation are modified, and the characteristics of the coupling equation are analyzed. The difference in the converter output voltage between the circuit equation and the control equation and the depth of its influence on the calculation process is revealed. On the basis of quantifying the difference at the converter output voltage, the circuit equation and the control equation are combined to form a short-circuit current calculation model with positive and negative sequence decomposition, which accurately characterizes the transient characteristics of fault current under different voltage drops and effectively improves the accuracy of the calculation results.

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考虑正序和负序分解的永磁直驱风力发电系统故障电流计算方法和特性分析
鉴于现有的永磁直驱风电场短路电流瞬态分析方法没有深入考虑在控制系统正负序解耦控制中广泛应用的正负序分解对故障电流计算过程的影响,本文提出了一种考虑正负序分解的瞬态短路电流计算模型。研究了正负序列分解的瞬态特性对控制系统的影响,揭示了其对短路电流瞬态变化的作用机理。修改了电路方程的正负序列解耦过程,分析了耦合方程的特性。揭示了电路方程与控制方程在变流器输出电压上的差异及其对计算过程的影响程度。在量化变流器输出电压差异的基础上,将电路方程与控制方程相结合,形成了正负序列分解的短路电流计算模型,准确表征了不同压降下故障电流的暂态特性,有效提高了计算结果的准确性。
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来源期刊
International Transactions on Electrical Energy Systems
International Transactions on Electrical Energy Systems ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
6.70
自引率
8.70%
发文量
342
期刊介绍: International Transactions on Electrical Energy Systems publishes original research results on key advances in the generation, transmission, and distribution of electrical energy systems. Of particular interest are submissions concerning the modeling, analysis, optimization and control of advanced electric power systems. Manuscripts on topics of economics, finance, policies, insulation materials, low-voltage power electronics, plasmas, and magnetics will generally not be considered for review.
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