A Power Coordinated Control Method Applicable to DC Interconnected Microgrid System

Abstract

The invention belongs to the field of electric power, and discloses a power coordination control method suitable for a DC interconnected microgrid system, including an active power coordination control method and a reactive power coordination control method, and the active power coordination control method is through the AC subnet The active power of the internal power supply and the active power of the interconnected converter are coordinated to control the frequency of the AC subnet, and the reactive power coordinated control method is to use the reactive power of the internal power supply of the AC subnet and the reactive power Coordinated power control regulates the voltage of the AC subnet, transmits the specified active power in the DC tie line, and balances the reactive power within the AC subnet. The method of the present invention can ensure the stability of the internal frequency of the AC subnet and maintain the active power transmitted by the tie line as a specified value; make full use of the reactive power adjustment capacity of the interconnected converter to realize the local balance of the internal reactive power of the AC subnet and the public exchange Effective control of bus voltage.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a power coordination control method suitable for a DC interconnected microgrid system. Background technique [0002] With the sharp reduction of conventional energy sources and the increasingly severe environmental pollution, experts and scholars from various countries continue to pay more attention to the development of microgrids. In recent years, the microgrid control technology has developed rapidly, especially the development of single microgrid. However, in the island mode of a single microgrid, the adjustment ability is relatively weak and the redundancy is low. The interconnected microgrid system connects adjacent areas or microgrids with corresponding functions through tie lines, and the power flow of the tie lines makes it possible for the interconnected microgrid system to work in coordination. The Internet microgrid system is expected to become one of the future operat...

AI Technical Summary

Problems solved by technology

[0004] 1) When the active power balance of the microgrid changes, the frequency fluctuates greatly, and the power of the tie line is not easy to control, which affects the stable operation of the system;

[0005] 2) When the reactive power of the microgrid changes, the interconnected converter cannot participate in the reactive power adjustment in the AC subnet, resulting in a waste of adjustment resources

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