Power-voltage coordination control method and device for DC power distribution network

Abstract

The invention provides a power-voltage coordination control method and device for a DC power distribution network, and the method comprises the steps: building a long-time scale system optimization control model according to the network topology, power and load conditions of the DC power distribution network; solving the long-time scale system optimization control model, and calculating the flow distribution of the DC power distribution network and the power reference value and voltage reference value of a current converter station; determining a sagging control curve according to the power reference value and voltage reference value of the current converter station; and achieving the no-difference adjustment of voltage according to the sagging control curve during load disturbance. The device comprises a modeling unit, a solving unit, a sagging curve control unit, and an adjustment unit. According to the technical scheme of the invention, the method can improve the operation reliability of a power grid, and guarantees the electric energy of the DC power distribution cabinet.

Description

technical field [0001] The invention relates to the technical field of power system distribution network operation control, in particular to a power-voltage coordinated control method and device for a DC distribution network. Background technique [0002] The DC distribution network is a DC-led power distribution system. It utilizes the flexible DC technology of voltage source converters and the characteristics of flexible and controllable power flow. The problem of insufficient reactive power supply in the load center provides an effective method. The primary problem of the DC distribution network is power control, and the active power balance of the DC grid is reflected by the DC voltage. Therefore, the key to the stable operation of the DC distribution network is to control the DC voltage. [0003] The voltage control methods of the DC distribution network mainly include voltage droop control and master-slave control. Among them, the voltage droop control means that the ...

AI Technical Summary

Problems solved by technology

[0005] The DC distribution network contains multiple converter stations, which involves issues such as power supply load balance and voltage quality. In order to meet the needs of the development of existing technologies, the present invention provides an operation control for the DC distribution network according to the control time and control Hierarchically construct the control objectives and strategies under different time scales of corresponding control modes, and a method and device for power-voltage coordinated control of DC distribution network under multiple time scales

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