Method for dynamically dividing and operating multiple islands of city micro power grid with photovoltaic power supplies

Abstract

The invention discloses a method for dynamically dividing and operating multiple islands of a city micro power grid with photovoltaic power supplies. The method is characterized in that the day distribution characteristic curve difference among loads and the photovoltaic power supplies in a power distribution network is fully considered, on the premise of preferably supplying power to a first class of loads, dynamically optimized supply to a second class of loads and a third class of loads according to industry classification in each separated period of time is performed, an island is formed by taking each photovoltaic power supply as a root node, and the condition that a plurality of individual power supply islands are fused with one another is considered. The method comprises the following steps of performing the short-period prediction of next 24 hours on a required power curve of each load and an output power curve of each photovoltaic power supply, establishing an optimized model of island power supply, simulating day load curves of several typical industries and day output power curves of the photovoltaic power supplies through three times of spline interpolation, acquiring the optimal power supply power of each distributed photovoltaic power supply for each industry in each period of time by a particle swarm optimization algorithm, and thus realizing the dynamic match of a load requirement and power generation.

Description

technical field [0001] The invention relates to the fields of distributed power generation and microgrids, in particular to a multi-island dynamic operation method of a microgrid containing distributed photovoltaic power sources. technical background [0002] Microgrid is composed of distributed generation (DG, including micro gas turbines, fuel cells, photovoltaic cells, small wind turbines), energy storage devices (supercapacitors or batteries), energy conversion devices, related loads and monitoring, protection devices It is a small power generation and distribution system gathered together, and it is an autonomous system that can realize self-control, protection and management. Based on the large power grid and supplemented by micro-grids composed of various DGs, it is an important way to make full use of renewable resources and build a smart grid, and has become an inevitable trend in the planning and operation of distribution networks in the world. [0003] The operat...

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Problems solved by technology

[0004] In the island operation of DG, a dynamic adaptation should be formed between the demand of load and the power generation of DG, so as to realize the full utilization of DG power generation and restore as many loads as possible. However, the existing island division Neither method takes into account the problem of matching the two

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