Direct-current microgrid control method and system based on hierarchical management

Abstract

The invention provides a direct-current microgrid control method and system based on hierarchical management. An overall control strategy of a direct-current microgrid is decomposed into an equipmentmanagement layer and a bus control layer structure. All parts of the microgrid are regulated based on own characteristics and working modes at the equipment management layer; and at a hybrid energy storage effect link, current controlling without energy storage battery compensation is carried out, so that the energy storage adjustment response speed and stability are improved. At the bus control layer, a set working mode controller carries out working mode division according to a fluctuation range of a bus voltage and the residual power of the battery, so that the system is able to carry out switching in different working states; and the working modes of all units of the equipment management layer are set based on different working modes, so that the stable operation capability of the direct-current microgrid is enhanced. And with consideration of the parallel energy storage control method, an adaptive droop coefficient regulator is established, so that the ring current influence between lines is suppressed and the time of reaching balancing of the parallel energy storage is shortened.

Description

technical field [0001] The invention belongs to the field of DC micro-grid operation and technical control, and relates to a DC micro-grid control method and system based on layered management, which can improve the stability of the overall operation of the micro-grid, and determine the power of each unit according to the bus voltage and energy storage power Working mode, to achieve the balance between the supply and demand of the system line flow energy. Background technique [0002] With the continuous development of my country's economic aggregate and the obvious improvement of people's living well-being, the development system that relies on traditional fossil energy such as coal and oil as the support for social progress is gradually disintegrating. At the same time, in order to meet the increasingly acute challenges of energy depletion and environmental pollution, combined with domestic and foreign new renewable energy utilization models and methods, a micro energy sup...

AI Technical Summary

Problems solved by technology

[0007] The present invention is a DC microgrid control method and system based on hierarchical management. Aiming at problems such as random distributed power generation of DC microgrid and complex coordinated control of multiple control targets, the DC microgrid is divided into equipment in terms of overall control strategy. Management layer and bus control layer

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