MAS-based distributed coordinated control method for virtual power supplies in low-voltage micro-grid

Abstract

The invention discloses an MAS-based distributed coordinated control method for virtual power supplies in a low-voltage micro-grid. The distributed coordinated control method comprises primary controland secondary control, wherein the primary control is used on the basis of coordination of virtual impedance and virtual power supplies, line impedance characteristics are improved through selectinga proper virtual impedance value, output voltage of various virtual power supplies between micro-sources is roughly the same, and reactive power equalization of the micro-sources is improved to a certain extent; and secondary control is based on a consistency protocol, interaction of voltage information of various virtual power supplies between the micro-sources is carried out through a sparse communication network of the micro-grid, and voltage of various virtual power supplies is coordinated to be strictly consistent. The interaction between the micro-sources is based on a built MAS, the primary control is executed by various micro-sources at the bottom layer as primary agents and the secondary control is executed by an upper coordination part as a secondary agent. According to the method, a control target can be provided with double guarantees through a two-layer control system, and meanwhile, voltage evaluation indexes for the virtual power supplies are determined to coordinate operation between the primary control and the secondary control.

Description

Technical field [0001] The invention relates to the field of smart grid control, in particular to a distributed coordinated control method of virtual power in a low-voltage microgrid based on MAS. Background technique [0002] In order to effectively solve many problems caused by the large-scale grid-connected state of various micro-sources, micro-grids have been created in the field of distributed power generation technology. Microgrids generally consist of micro sources, energy storage units, loads and their control systems, which can effectively integrate renewable energy sources such as photovoltaic power generation and wind power generation. Generally, there are two operating modes: island mode and grid-connected mode. Under circumstances such as external disturbance, the grid-connected mode enters the island mode, and the micro source independently supplies power to the load. For micro grids operating in island mode, droop control is one of the most commonly used control m...

AI Technical Summary

Problems solved by technology

In addition, in the low-voltage microgrid, the resistive line impedance will also cause power coupling. Generally, decoupling measures such as virtual impedance and coordinate transformation are used, but the effect is very general.

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