A DC energy consumption device, system and control method

Abstract

The invention discloses a DC energy consumption device. The device is composed of an energy consumption branch and an energy consumption resistor. The energy consumption branch is composed of at least one energy consumption sub-module connected in series in the same direction. The first end of the series connection Defined as the positive pole of the device, the tail end of the series connection is defined as the negative pole of the device; the positive pole of the device is connected to the positive pole of the DC line, the negative pole of the device is connected to the negative pole of the DC line; one end of the energy dissipation resistor is connected to the energy dissipation The connection point between any two energy-consuming sub-modules in the branch is connected, and the other end is used as the output end of the device; the present invention also includes a DC energy-consuming system and a control method composed of a DC energy-consuming device. At this time, the energy consumption speed can be controlled by adjusting the number of input or withdrawal of energy consumption sub-modules in the energy consumption branch and controlling the flow current of the energy consumption resistor. The device has high cost performance, high reliability and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of high-power electric current conversion, and in particular relates to a DC energy consumption device, system and control method. Background technique [0002] In HVDC power transmission system, DC energy consumption device is a crucial equipment. The DC energy consumption device is mainly used in the application scenario of island power supply. If the power generation end is an inertial power source similar to wind power, when the power receiving end fails, because the power cannot be sent out, the energy will be accumulated on the DC side, resulting in the voltage of the DC transmission line. If it rises, it will endanger the safe operation of the equipment. [0003] In the prior art, the method adopted is that when the DC voltage is too high, through the control of the power electronic device, a resistor is put in, and the input of the resistor will cause the DC voltage to drop. When the energy consumpt...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a DC energy-consuming device and a control method using the above-mentioned device. The device is connected in parallel between the positive and negative poles of the medium and high-voltage DC lines, and the control of the input and exit of the energy-consuming sub-modules can be adjusted. The current flowing through the energy-dissipating resistor controls the energy-dissipating speed. The device is cost-effective and solves the problems of uneven breaking voltage and difficult value selection of resistors in the prior art.

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