Power coordination control method suitable for direct-current interconnected micro-grid system

Abstract

The invention belongs to the field of electric power, and discloses a power coordination control method suitable for a direct-current interconnected micro-grid system. The power coordination control method comprises an active power coordination control method and a reactive power coordination control method. According to the active power coordination control method, frequency adjustment of the alternating current subnet is carried out through coordination control of active power of a power supply in the alternating current subnet and active power of an interconnected converter. According to the reactive power coordination control method, voltage regulation of the alternating current subnet is carried out through coordination control of reactive power of a power supply in the alternating current subnet and reactive power of an interconnected converter, specified active power is transmitted in a direct current tie line, and the reactive power is balanced in the alternating current subnet. The power coordination control method can ensure the internal frequency of the alternating current subnet, and maintain the active power transmitted by the tie line to be a specified value; and the reactive power regulation capacity of the interconnected converter is fully utilized, and reactive power in-situ balance in the alternating current subnet and effective control over the voltage of the common alternating current bus are achieved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a power coordination control method applicable to a DC interconnected micro-grid system. Background technique [0002] With the sharp reduction of conventional energy sources and the increasingly severe environmental pollution, experts and scholars from various countries have continuously strengthened the importance of microgrid development. 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 capability 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 tie lines makes it possible for the interconnected microgrid system to coordinate work. The Internet micro-grid system is expected to become one of the future op...

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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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