Multi-time scale power distribution network voltage optimization method considering photovoltaic multi-state adjustment

Abstract

The invention provides a multi-time scale power distribution network voltage optimization method considering photovoltaic multi-state adjustment. The method comprises the following steps of: establishing a distributed photovoltaic multi-operation state model according to the adjustment capability of distributed photovoltaic units in different operation states; according to the distributed photovoltaic multi-operation-state model, establishing a multi-time-scale power distribution network reactive voltage coordinated optimization model on the basis of conventional reactive voltage regulation equipment; and solving the optimization model of each stage by using an improved particle swarm algorithm, taking a target function as a particle fitness function, and making an output action plan for the reactive power control equipment and the distributed photovoltaic unit of each node according to the optimization result of the reactive power control equipment and distributed photovoltaic multi-state output. According to the method,the reactive voltage optimization scheme can be formulated according to the reactive regulation equipment with different characteristics and the characteristics of the multi-state adjustment capability of the distributed photovoltaic units, the operation voltage of each node of the distribution network at each moment is improved, and the problems of system voltage deviation and fluctuation caused by the access of a distributed power supply are reduced.

Description

technical field [0001] The invention relates to the technical field of active power distribution network of electric power system, in particular to a multi-time scale distribution network voltage optimization method considering photovoltaic multi-state regulation. Background technique [0002] In today's increasingly serious energy and environmental problems, distributed generation (DG) has been widely concerned and valued by people. However, because DG has random fluctuations different from traditional power generation and there is a peak-to-valley difference between DG and the actual grid power load, it changes the original distribution network unidirectional power flow and its value after it is connected. The distribution network voltage has a very serious impact. Therefore, it is necessary to conduct in-depth research on the influence of DG on its operating characteristics after it is connected to the distribution network and the reactive power and voltage control strat...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing technology is difficult to apply to the distributed photovoltaic grid-connected distribution network that only configures switchable capacitor / reactor groups, so as to provide a multi-state photovoltaic system that considers multi-state regulation. Time scale distribution network voltage optimization method

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