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Analysis of the Influence of "Source-load" Time Series Changes on Voltage and Reactive Power Partitioning in Distribution Network

With large scale of distributed generations(DGs) access to the distribution network, the complexity of system optimization and control increases considering the random output of DGs and load fluctuation. In this paper, the influence of DGs connected to the distribution network on voltage and reactive power partitioning is analyzed based on the time series variation characteristics of power source and power load. Firstly, based on the principle of voltage and reactive power partitioning, four indexes containing inter-region coupling degree, intra-region coupling degree, regional reactive power balance degree and regional reactive power reserve are selected as the partitioning evaluation indicators. Secondly, typical scenarios of the "source-load" time series are divided with the comprehensively analysis of the time series characteristics of wind power and photovoltaic output and the typical daily load curve. Then, the influence of the four partition evaluation indicators in multiple "source-load" scenarios is analyzed. Finally, case studies based on modified IEEE33 test system are performed, and the result verifies the influence of the variation of "source-load" time series output on voltage reactive power partitioning.