基于继电保护的分布式电源准入容量的研究

论文总字数：19258字

目 录

1.引言.........................................................................................................................................1

1.1 分布式电源的概念及分类...................................................................................................1

1.2 分布式电源的特点...............................................................................................................1

1.3 分布式电源在国内的应用现状...........................................................................................2

1.4 分布式电源准入容量的定义...............................................................................................3

2.分布式电源接入对继电保护的影响.....................................................................3

2.1单DG接入.............................................................................................................................3

2.1.1 DG位于故障上游........................................................................................................4

2.1.2 系统侧相邻馈线故障或DG位于故障下游.................................................................7

2.2多DG接入..............................................................................................................................8

2.2.1 故障发生于两DG下游.................................................................................................9

2.2.2 故障发生于两DG相邻馈线........................................................................................11

3.DG接入配电网中计及短路电流的计算模型..................................................12

3.1 模型的搭建.........................................................................................................................12

3.1.1 配电网模型..................................................................................................................12

3.1.2 分布式电源模型..........................................................................................................13

3.2 考虑电流约束条件的DG准入容量计算方法.................. ................................................14

3.3 考虑短路电流约束的单DG模型.......................................................................................15

3.4 考虑短路电流约束的多DG模型.......................................................................................16

4.算例分析..............................................................................................................................16

4.1 单分布式电源算例..............................................................................................................16

4.2 多分布式电源算例..............................................................................................................19

5.结论与展望........................................................................................................................20

参考文献...................................................................................................................................21

致谢..............................................................................................................................................22

基于继电保护的分布式电源准入容量的研究

朱轶昇

，China

Abstract:The progress and development of distributed power generation technology can make the distributed power supply can be achieved, how to correctly evaluate the impact of distributed power access on the system and the calculation of the incoming capacity to ensure that the existing system and distributed power supply is stable and stable operation is particularly important The The access of the distributed power supply changes the short-circuit current of the distribution network. The protection system of the distribution network is designed according to the single-power radiated grid structure. The networking of the DG makes the distribution network become a multi-power structure, normal work. This article is on the basis of this issue to explore. In this paper, the concept of distributed power supply and the definition of access capacity are introduced. Then, the influence of DG access on relay protection is analyzed. For the access capacity problem, the access capacity under short circuit current is analyzed Calculation method and model, through the matlab to build the model and programming operations to verify the feasibility of the model.

Key words: distribution network; relay protection; distributed generation; short - circuit current ; penetration level

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