Device and system for DC energy consumption, and control method

Abstract

The invention discloses a device for DC energy consumption. The device is composed of an energy consuming branch and a power consuming resistor. The energy consuming branch is formed by connecting atleast one energy consuming sub-module in series in the same direction. A head end of the series connection is defined as a positive pole of the device, and a tail end of the series connection is defined as a negative pole of the device. The positive pole of the device is connected with the positive pole of a direct current line, and the negative pole of the device is connected with the negative pole of the direct current line. One end of the power consuming resistor is connected with a junction point between the two energy consuming sub-modules in the energy consuming branch, and the other endis used as an output end of the device. The device also includes a system for DC energy consumption, and the system is formed by the device for DC energy consumption, and a control method. When DC line voltage is increased, through adjusting input or exist number of the energy consuming sub-modules in the energy consuming branch, current flowing through the energy consuming resistor is controlled, thereby controlling energy consumption speed. 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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