Distributed coordination control method for voltage and current distribution of DC microgrid

Abstract

The invention discloses a distributed coordination control method for the voltage and current distribution of a DC microgrid, and the method comprises the following steps: 1, setting distributed coordination controllers, corresponding to all distributed power supplies participating in coordination control in the microgrid, for the distributed power supplies, wherein each distributed coordination controller is connected with the converter controller of the corresponding distributed power supply; 2, connecting the distributed coordination controllers through a communication network. According tothe invention, the distributed coordination controllers are adopted for all distributed power supplies, and a sparse communication network is introduced between the coordination controllers; the consistency degree of the voltage and the current is artificially set through the consistency degree parameter; a virtual pilot node method is adopted for compensating the voltage drop of the bus voltagerelative to a rated value caused by a droop control method. Compared with the prior art, the method has the advantage that the DC microgrid can be controlled more efficiently.

Description

technical field [0001] The invention relates to the field of direct current microgrid control, in particular to a distributed coordinated control method for voltage and current distribution of a direct current microgrid. Background technique [0002] Using distributed new energy to replace traditional fossil energy is an effective way to deal with environmental pollution. Distributed new energy generation systems usually have DC characteristics. Using DC microgrids to integrate distributed energy can improve efficiency, reduce the use of inverters, and reduce construction and operating costs. Therefore, the DC microgrid is becoming an increasingly concerned power supply system. [0003] There are two basic control objectives of DC microgrid, namely voltage stability and proportional distribution of load power. Voltage stability refers to the function of the control system to make the bus voltage of the DC microgrid reach and stabilize near the rated value. However, due to...

AI Technical Summary

Problems solved by technology

The proportional distribution of current can be realized through the use of the consistency algorithm, but the consistency of the bus voltage cannot be controlled. The voltage difference between different buses may be large, and the predetermined voltage stability conditions cannot be reached, resulting in the unstable operation of the system.

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