考虑“源—荷”时序特性的配电网电压无功分区

Voltage and reactive power partitioning of distribution network considering the temporal information of"source-load"

分布式电源(DG)大规模接入配电网,其随机出力叠加负荷波动,增加了系统优化运行与控制的复杂程度。基于“源—荷”时序变化特性分析DG接入对配电网电压无功分区的影响,提出一种分区方案调整策略。首先,基于电压无功分区原则选取区域无功平衡、区域间耦合度、区域内耦合度以及区域无功储备等指标作为分区评价指标,建立基于增广电压/无功灵敏度矩阵的模糊聚类分区模型,并通过分析风电、光伏时序出力特性,结合典型日负荷曲线划分“源—荷”典型时序场景;然后,分析在多个“源—荷”场景下四项分区评价指标的变化,进而针对“源—荷”时序变化导致的分区指标变化,提出分区调整方法;最后,利用改进的IEEE 33节点系统进行仿真分析。结果表明,“源—荷”的时序出力变化对电压无功分区影响较大,所提分区调整方法可以根据“源—荷”时序变化对分区方案进行动态调整,能较好地将各分区评价指标控制在合理范围。

The integration of distributed generation(DG)to the distribution network and the random characteristic of DGs and load fluctuations increase the complexity of system optimization and control.In this paper,an adjustment strategy for partitioning is proposed considering the influence of DG integration on system voltage and reactive power partitioning based on the temporal characteristics of"source-load".Firstly,based on the principle of voltage and reactive power partitioning,four indexes containing regional reactive power balance,inter-regional coupling,intra-regional coupling,and regional reactive power reserve are selected as,and a fuzzy clustering partitioning model is established based on the augmented voltage and reactive power sensitivity matrix.Secondly,the characteristics of time series output of wind power and PV power,and typical daily load curve is analyzed to select the typical scenarios based on"source-load"time series.Then,a partitioning adjustment method is proposed considering the variations of the four regional evaluation indexes in multiple"source-load"scenarios.Finally,the simulation is conducted based on the modified IEEE 33-node system.And the results show that the sequential variation of the"source-load"affects the voltage and reactive power partitioning.Besides,the evaluation indexes of each partition can be controlled in a reasonable range based on the proposed partitioning adjustment method.