摘要：近年来，随着分布式电源越来越多的接入传统配电网，分布式电源复杂的故障特性会对配电网的安全运行，继电保护措施产生很大的影响。因此，需要对分布式电源的故障特性进行深入研究。同时，在对含分布式电源的配电网进行短路故障计算时，无法将分布式电源当作传统的电机进行处理，这就导致传统的电网故障计算方法不能用来计算含分布式电源的配电网。因此，需要根据分布式电源的故障特性，建立在电网故障时分布式电源的等效计算模型。本文以双馈式异步发电机为例，对分布式电源进行了研究。首先具体研究了撬棍保护动作时，DFIG的故障电流特性，建立了在两相静止坐标系下的简化的定子绕组计算模型。然后研究了计及励磁调节特性的DFIG，采用平衡的DFIG定子电流控制策略，建立此时DFIG在短路计算中的等效模型。最后介绍了含DFIG的配电网短路故障计算新方法并通过案例具体分析。84287

毕业论文关键词  分布式电源  双馈式异步风机  故障电流特性  短路故障计算

毕业设计说明书外文摘要

Title  Analysis and application of short circuit faults in power grid with distributed generation of asynchronous type                     

Abstract In recent years, with more and more access to the traditional distribution network, The complicated fault current characteristics of DGs will have a great impact on the safe operation of the power grid and the relay protection measures。 Therefore, it is necessary to deeply study the fault characteristics of distributed  generators。 At the same time , when short circuit fault calculation of power grid with distributed generation cannot be processed as traditional motor, which led to the traditional fault calculation method cannot be no more applied to calculate the distribution network with distributed generation。 Therefore, according to the fault characteristics of distributed generators, the equivalent calculation model of distributed generation need to be established。 In this paper, the double fed induction generator is studied。 Firstly, it studies when the crowbar protection activated the fault characteristics of the DFIG, a fault current analysis method based

on the simplified calculation model of stator flux linkage is proposed。 Then, considering the characteristics of the excitation regulator and the DFIG, the DFIG stator current control strategy is adopted to establish the equivalent model of DFIG in short circuit calculation。 At last, a new method of short circuit fault calculation of distribution network with DFIG is introduced。

Keywords  distributed generators  doubly-fed induction generator  fault current characteristics  short circuit fault calculation

目 录

1  引言 1

1。1  背景及意义 1

1。2  国内外研究现状 1

1。2。1  双馈式异步风力发电机的研究现状 2

1。2。2  含DFIG配电网故障计算方法 2

1。3  本文的主要研究工作 3

2  异步型分布式电源的故障特性及短路模型 4

2。1  双馈异步感应风机的基本结构 4

2。2计及撬棍保护影响的双馈异步风机故障计算模型 4

2。2。1两相静止坐标系下DFIG动态模型 5

2。2。2电网故障DFIG的定子电流特性