A control system and control method for a direct current energy consumption device

Abstract

The invention discloses a DC energy consumption device control system and control method. The system includes a flexible DC control and protection system and an energy consumption device control system; the method steps are: the flexible DC control and protection system collects the AC and DC signals of the flexible DC transmission system and operates the equipment status, and when the AC system fails and meets the switching conditions, it sends the DC energy switching command and surplus power to the control system of the energy consumption device; if the communication is normal, the control system of the energy consumption device The energy consumption command and surplus power value can be put into operation according to the state of the energy consumption device; if the communication fails, the control system of the energy consumption device will input the energy consumption power when needed according to the DC voltage and current signals collected by itself. This technical solution can accurately input the required energy consumption power according to different fault types and the communication status of the control system, stably control the DC voltage during the fault period, and improve the stability and reliability of the power transmission system.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission in electric power systems, and in particular relates to a control system and a control method for a direct current energy consumption device of an offshore flexible direct current transmission system. Background technique [0002] In the new energy HVDC transmission project, the DC energy consumption device is a crucial equipment. The DC energy consumption device is mainly used in the application scenario where new energy is transmitted through DC. If the sending end is a new energy source such as a wind farm, when the AC system at the receiving end fails, since the receiving end transmits power first, the energy will be accumulated on the DC side. It will cause the DC voltage to rise and endanger the safe operation of the equipment. The purpose of installing the energy-consuming device in the receiving-end converter station is to ensure that the energy-consuming devi...

AI Technical Summary

Problems solved by technology

[0007] The energy consumption device itself can detect the DC bus voltage and the current of the energy consumption branch. The previous strategy only relied on the DC voltage criterion to judge the input conditions of DC energy consumption, which is more likely to lead to wrong input of energy consumption and thus increase the requirements for energy consumption equipment.

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