Energy management prediction control method for direct-current microgrid community

Abstract

The invention discloses an energy management prediction control method for a direct-current microgrid community, and belongs to the technical field of direct-current microgrid communities. The methodcomprises direct-current micro-grids and a hierarchical control strategy; when the hierarchical control strategy is carried out on a direct-current micro-grid community, each direct-current micro-gridcommunicates with an adjacent unit, and power flow and energy management among networks are processed by adopting a three-time control strategy based on a consistency algorithm. According to the invention, the PFC algorithm is applied to the hierarchical control of the direct-current microgrid community; the influence of relatively low top layer control bandwidth is solved; the bus voltage of theadjacent direct-current micro-grids rapidly deviates; three times of control are started at the millisecond-level speed; load power balance of the whole direct-current microgrid community is achieved; load pressure is shared for all direct-current microgrids in the community; overlarge stress borne by power electronic devices is avoided; the service life of the devices is prolonged; the interconnection reliability of the direct-current microgrid community is improved; and the number of controllers and the cost of the devices are reduced.

Description

technical field [0001] The invention relates to the technical field of DC micro-grid clusters, in particular to an energy management predictive control method for DC micro-grid clusters. Background technique [0002] In recent years, with the rapid development of the world economy, the demand for energy is increasing, and the energy structure with the theme of coal and oil has led to continuous deterioration of the environment. Promoting an energy system dominated by clean energy will become a major trend in global energy development. In order to efficiently utilize renewable energy and ensure the stability and reliability of power supply in the region, scholars have proposed the concept of microgrid, and DC microgrid Distributed power generation system has broad development prospects because it has no frequency, phase, reactive power and other problems and has the advantages of high efficiency and high reliability. [0003] DC microgrids usually have low working voltage an...

AI Technical Summary

Problems solved by technology

However, the tertiary control adopts the traditional linear PI regulator, which has inherent defects such as single variable, single control target, and poor control effect, resulting in long control time and slow bus voltage tracking speed, which seriously affects the power flow and energy management between DC microgrids. It is also extremely detrimental to the reliability of the power supply of the DC microgrid

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