Multi-micro-grid fault management method with consideration of island operation time uncertainty

Abstract

A multi-micro-grid fault management method with consideration of island operation time uncertainty comprises the following steps of S1, performing discretization processing on continuous 24 hours in one day; S2, establishing a current prediction model; S3, according to RES output, load prediction and uncertain island time, generating a random scene according to an MC method; S4, according to the supply-and-demand relation of each micro-grid, determining the current electricity price in real time; S5, minimizing the cost of a single micro power grid in the system, establishing a micro-power-grid operation total cost model; S6, based on a limited time domain rolling optimization framework, optimizing each micro power grid, thereby realizing an optimal operation state; and S7, establishing agaming operation model of a micro power grid of the micro power grid group, obtaining a strategy set according to the steps S6-S7, searching an optimal decision by each micro grid, and calculating whether Nash equilibrium is reached. The multi-micro-grid fault management method has advantages of effectively improving economic performance and safety of the micro power grid, effectively minimizing load reduction and reducing operation risk.

Description

technical field [0001] The invention belongs to the technical field of multi-microgrid fault management, and in particular relates to a multi-microgrid fault management method considering the uncertainty of island running time. Background technique [0002] In recent years, with the ever-increasing energy crisis and increasingly severe environmental pollution, the utilization of renewable energy such as solar energy and wind energy has become an important task in the energy field of today's society. Composed of equipment, loads, monitoring and protection equipment, it is an intelligent system that can achieve a high degree of autonomy. , environmental protection, economy and other advantages are quickly valued by countries all over the world. [0003] The microgrid can provide supplements to the large power grid and improve the reliability and quality of regional power supply. The microgrid has two modes: grid-connected operation and island operation. The island-type microg...

AI Technical Summary

Problems solved by technology

It is difficult to evaluate a system using deterministic methods given that the probability distributions of a range of related factors are different

If a fault occurs, the microgrid operates in an isolated island. At this time, it is necessary to consider not only the multi-microgrid operation mode, but also the randomness of the system, including the uncertainty of wind and solar output and the uncertainty of island duration. In order to solve these problems, Traditional research only focuses on the power quality problems that occur during the process of on-grid and off-grid switching. For isolated islands, only the stable operation is considered, and less consideration is given to the management and optimization strategies of the load system.

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