Distributed power generation connected to distribution network and microgrid group partition control method and system

Abstract

The invention provides a distributed type power supply accessed into a power distribution network and a microgrid group zone control method and a microgrid group zone control system. The microgrid group zone control method comprises the following steps: establishing a simulation model according to microgrid capacity and a microgrid access position determined by a microgrid user accessed into the power distribution network, calculating voltage sensitivity of front, middle and tail-end microgrid nodes to other microgrid nodes except from the front, middle and tail-end microgrid nodes, and a distributed type power supply under each static mirogrid maximum operating mode; combining other microrgid nodes, with voltage sensitivity difference smaller than a preset threshold value to obtain novel other microgrid nodes; perofmring fuzzy clustering on the voltage sensitivity to obtain novel association degree indexes, corresponding to the front, middle and tail-end microgrid nodes, of the other microgrid nodes, and performing partition and coordinate control on the microgrid group accessed into the power distribution network; comparing and analyzing the coordinate control results with the practical microgrid group operation data, and corresponding the microgrid partition results. The method can be used for performing partition control on accsess power distribution network distribution type power supply and the microgrid group, so that the power distirbutrion voltage stability is improved more efficiently and flexibly.

Description

technical field [0001] The invention relates to the technical field of renewable energy power generation, in particular to a distributed power supply connected to a distribution network and a microgrid group partition control method and system. Background technique [0002] With the increase of the penetration rate of smart microgrids in the power grid, the demand for coordinated scheduling among a large number of widely distributed smart microgrids is becoming more and more urgent. At present, series and parallel networking structures are mostly used among multi-microgrids, and a two-level hierarchical control scheme for multi-microgrid systems with different structures of series and parallel connections is designed. Based on the effective operating state allowed by the multi-microgrid system, the transition of the operating state of the microgrid is formulated according to its current state and trigger events. At present, research on distributed generation access control ...

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Problems solved by technology

[0003] Microgrid and distributed power generation will be developed in the form of microgrid clusters. The research on the structure and control of microgrid clusters in foreign countries started earlier than in China, but there is no standard definition for the concept of microgrid clusters. It is generally believed that there are more than three There are interconnected microgrid components, and how to quantify and define this connection to guide future planning and operation has not yet been clearly stated

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