Economic dispatching method and system for microgrid based on distributed network control

Abstract

The invention discloses an economic dispatching method and system for a microgrid based on distributed network control. The method comprises S1: deriving a theoretical optimal output formula of controllable distributed generation DG under a constraint condition according to an economic dispatching model; S2: constructing a communication network according to a microgrid double-layer control model comprising a lower microgrid and an upper communication network; S3: designing a weight matrix according to the upper communication network and obtaining a distributed control law according to the weight matrix; S4: calculating a set value according to the distributed control law, and adjusting the output of the controllable distributed generation DG according to the calculated set value, thereby realizing economic optimal dispatching of the microgrid. The method and the system have the advantages that the total power generation cost of the microgrid can be minimized by realizing equal tiny increase rate of all controllable DGs; convenience is provided for an algorithm design by designing the weight matrix; and the system power balance can be ensured during the iteration process.

Description

technical field [0001] The invention relates to the technical field of micro-grid distributed control, in particular to a micro-grid economic scheduling method and system based on distributed network control. Background technique [0002] In recent years, distributed generation (Distributed Generation, DG) relying on renewable energy has developed rapidly, and microgrid, as an effective management form of distributed Power supply reliability and stability are of great significance. However, renewable energy power generation depends on the external environment, its output has obvious randomness, and the load demand has fluctuations. At the same time, the inertia of the microgrid itself is small, and the two-way flow of the power flow. Economic dispatch of microgrids becomes very difficult. [0003] At present, the average consensus algorithm has been widely used in the economic dispatch of microgrids, but there are two problems: 1) In the iterative process, the average cons...

AI Technical Summary

Problems solved by technology

However, renewable energy power generation depends on the external environment, its output has obvious randomness, and the load demand has fluctuations. At the same time, the inertia of the microgrid itself is small, and the two-way flow of the power flow. Economic dispatch of microgrids becomes very difficult

[0003] At present, the average consensus algorithm has been widely used in the economic dispatch of microgrids, but there are two problems: 1) In the iterative process, the average consensus algorithm will destroy the system balance; Nodes with centralized functions cannot achieve complete distribution

Images