﻿ 微电网分布式电源的选址和定容 Siting and Sizing of Distributed Generation in Micro-Grid

Smart Grid
Vol.05 No.03(2015), Article ID:15591,10 pages
10.12677/SG.2015.53017

Siting and Sizing of Distributed Generation in Micro-Grid

Xiangyang Zhao1, Xingxuan Wang1,2*, Yunfeng Feng2, Xuanzi Chen1

1School of Automation Science and Electrical Engineering, Beihang University, Beijing

2Jiangxi ENACS Renewable Energy Resources and Micro Grid Innovations Co. LTD, Ji’an Jiangxi

Received: Jun. 7th, 2015; accepted: Jun. 26th, 2015; published: Jun. 30th, 2015

ABSTRACT

Siting and sizing of Distributed Generation (DG) is an important research topic in micro-grids development. Firstly, we introduce the power flow method based on back/forward sweep and the static voltage stability index in micro-grid. Then, based on the voltage level of DG access each series and parallel branch, we optimize the DG layout. Simultaneously, taking into account the degree of improvement in power losses and static voltage stability these two important indicators, we optimize DG capacity, using particle swarm optimization (PSO) with inertia weight to solve this problem. Finally, an example simulation results show that this method can effectively improve the voltage level, reduce active power loss, improve static voltage stability of micro-girds, and has some practical value in DG planning stage of siting and sizing.

Keywords:Distributed Generation, Siting and Sizing, Power Losses, Static Voltage Stability

1北京航空航天大学自动化科学与电气工程学院，北京

2江西仪能新能源微电网协同创新有限公司，江西 吉安

1. 引言

2. 微电网潮流计算

3. 微电网系统的静态电压指标

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Figure 1. Typical branch of a simple distribution network

4. 分布式电源的选址和定容

4.1. DG安装位置优选原则

1) 从DG对节点电压的影响角度考虑，DG接入前电压较低的节点；

2) 对于不同的串并联支路处理方法不同。

a) 串联支路：优先选取电压水平低于0.975 pu的末节点接入DG；

b) 并联支路：选取电压水平低于0.975 pu的节点接入DG或并联支路的根节点接入DG。

4.2. 网损改善指标

(8)

4.3. 静态电压稳定性改善指标

(9)

4.4. DG选址定容优化模型

(10)

(11)

(12)

(13)

(14)

(15)

5. 模型的求解

5.1. 粒子群优化算法

(16)

(17)

(18)

5.2. 基于粒子群算法的DG选址定容流程

1) DG的选址：

a) 串联支路：优先选取电压水平低于0.975 pu的末节点接入DG；

b) 并联支路：选取电压水平低于0.975 pu的节点接入DG或并联支路的根节点接入DG。

2) 采用带惯性权重的粒子群优化算法进行DG优化规划，其具体流程如图2所示。

6. 算例分析

I区(<0.95 pu)：节点2；

II区(0.95 pu-0.975 pu)：节点5、9、8、1 (升序)；

III区(0.975 pu-1.00 pu)：节点4、7、6、3 (升序)。

6.1. DG接入对系统电压分布的影响及选址

a) 节点1、2所在串联支路，由于1号节点的电压水平非常接近0.975 pu，而节点2的电压水平在0.95pu以下，因此，节点2优先接入DG，才能有效提升该节点的电压水平。

Figure 2. DG programming flow chart based on particle swarm optimization algorithm

Figure 3. A structure diagram of 10KV 10 nodes microgrid system

b) 节点3、4、5所在串联支路，由于节点3、4的电压水平均在0.975 pu以上，节点5的电压水平在0.95 pu~0.975 pu之间，因此，对于该支路应优先在节点5接入DG。

c) 节点6~9所在并联支路，节点8、9电压水平均在0.975 pu以下，因此，欲提高节点8、9电压水平，需在节点8、9接入DG (优先选择)或在节点6接入DG或其他选择。

6.2. DG定容研究

Figure 4. Nodes’ voltage values without DG

Figure 5. System’s voltages distribution curve chart when node 2’ voltage values with DG’s capacity from 0 MW to 3 MW

Figure 6. System’s voltages distribution curve chart when node 4’ voltage values with DG’s capacity from 0 MW to 3 MW

Figure 7. System’s voltages distribution curve chart when node 6’ voltage values with DG’s capacity from 0 MW to 3 MW

Figure 8. System’s voltages distribution curve chart when node 9’ voltage values with DG’s capacity from 0 MW to 3 MW

Figure 9. Each node per-unit value of four schemes

Table 1. Comparison of the optimization results

7. 结论

Siting and Sizing of Distributed Generation in Micro-Grid. 智能电网,03,137-147. doi: 10.12677/SG.2015.53017

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