Direct-current power distribution network bus voltage control system and control method thereof

Abstract

The invention relates to a direct-current power distribution network bus voltage control system and a control method thereof and belongs to the power electronics technology field. The direct-current power distribution network bus voltage control system comprises a main server and a local server. The system is characterized in that the local server and the main server are mutually connected so as to form horizontal interconnection; the local server is connected to a direct current bus through a distributed power supply module; the direct current bus is connected to an alternating current power grid through an AC / DC conversion current module; the main server is connected to the AC / DC conversion current module; the local server is used for monitoring a voltage of the direct current bus and responding to a control instruction of the main server; and the main server is used for emitting the control instruction to the local server. In the method, the local server and the main server are connected through a horizontal interconnection form so as to form a parallel network system, and feedback response is performed on a fluctuation of the voltage of the direct current bus so that a corresponding speed of the whole system is increased and the voltage of the direct current bus can be maintained to be in an allowable range.

Description

technical field [0001] The invention relates to a DC distribution network busbar voltage control system and a control method thereof, belonging to the technical field of power electronics. Background technique [0002] The traditional AC distribution network is facing many severe challenges such as insufficient power supply capacity, continuous improvement of user requirements for power quality and power supply reliability, and distributed power access. [0003] Flexible DC distribution network has better performance than AC distribution system in terms of transmission capacity, controllability, power quality and power supply reliability. Flexible DC distribution network has received extensive attention and research. [0004] In the past DC distribution network, the detection and control system of the lower layer will upload the voltage and power information detected at the interface of the AC / DC converter and the distributed power supply to the upper controller through a u...

AI Technical Summary

Problems solved by technology

Although such a control system has strong reliability and controllability, it is expensive and not flexible enough due to the need for a large number of communication equipment and large upper-level control equipment.

And because of the interconnection in the vertical direction, the control structure is relatively complex and the response speed is slow, and it cannot well control the voltage fluctuation and power flow direction of the DC bus of the DC distribution network.

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