Improved Forward and Backward Substitution in Calculation of Power Distribution Network with Distributed Generation

doi:10.7652/xjtuxb201306020

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Improved Forward and Backward Substitution in Calculation of Power Distribution Network with Distributed Generation

更新时间：2025-05-01

- Improved Forward and Backward Substitution in Calculation of Power Distribution Network with Distributed Generation
- Vol. 47, Issue 6, Pages: 117-123(2013)
- 作者机构：
  
  东北石油大学电气信息工程学院,黑龙江,大庆,163318
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201306020
  CLC： TM744
- Online First：10 June 2013，
  
  Published：2013
- 稿件说明：
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Improved Forward and Backward Substitution in Calculation of Power Distribution Network with Distributed Generation[J]. 2013, 47(6): 117-123.
DOI：

Improved Forward and Backward Substitution in Calculation of Power Distribution Network with Distributed Generation[J]. 2013, 47(6): 117-123. DOI： 10.7652/xjtuxb201306020.

摘要

针对含分布式电源(DG)的接入会使传统的前推回代法失效的问题

对DG并网后的前推回代法进行了改进。由于传统的无功初值取值方法与实际值偏差较大

使迭代次数增加

本算法基于无功分摊原理确定PV型DG的无功初值

改进了无功修正值的求法。传统的前推回代法不能处理PV型节点

因此需要把PV节点转换为PQ节点进行求解

给出了无功修正量与节点的电压偏差和节点电抗的关系。结果表明:对于PV恒定型DG单独并网时的潮流

PV型DG从1～3台并网计算中

分别迭代到5、7、7次收敛

收敛次数增加小于2次

迭代时间增加少于0.01 s; 同时给出了PQ型和PI型DG单独、混合并网时的计算结果

各方案的迭代次数小于10次

时间增加小于0.01 s

说明本算法对解决PQ、PI和PV节点单独、混合接入DG的潮流计算问题的正确性。

Abstract

To solve the invalidity of traditional forward and backward substitution in distributed generation(DG)case

an improved forward and backward substitution method is proposed. Large deviation between the reactive initial value from the traditional method and the actual value leads to increasing iterations

so reactive power allocation theory is considered to determine the reactive initial value

and to improve the algorithm for modified reactive value. The traditional forward and backward substitution is unable to deal with PV-type nodes

they have to be converted to PQ nodes to solve. The relationship of reactive power revised value with voltage deviation of nodes and node reactance is obtained. The simulation indicates that for load flow of single invariable PV-type DG connecting to grid

the convergence needs 5

7 and 7 iterations respectively for one to three PV-type DG grid. The increase of iteration number is less than 2 and the increased iteration period is less than 0.01 s to verify the reasonableness of the algorithm. For PQ-type and PI-type DG separate grid or mixing grid

the iterations of all options are less than 10

and increased period is less than 0.01 s.

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