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Modular controllable unloading circuit and control method

An unloading circuit, modular technology, applied in the direction of climate sustainability, power transmission AC network, AC network voltage regulation, etc., can solve the problem of lack of energy consumption methods for high-voltage DC lines, and achieve the effect of maintaining balanced operation

Active Publication Date: 2019-12-13
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem existing in the prior art that there is a lack of an energy consumption method suitable for high-voltage DC lines, the present invention provides a modular controllable unloading circuit and a control method

Method used

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  • Modular controllable unloading circuit and control method
  • Modular controllable unloading circuit and control method
  • Modular controllable unloading circuit and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a modular controllable unloading circuit, the circuit structure diagram is as follows figure 1 shown.

[0049] This circuit is applied to the DC transmission power system, and the controllable unloading circuit is connected in parallel with the inverter converter station; the implementation steps of the technical solution are as follows:

[0050] (1) The controllable unloading circuit is composed of several unloading circuit sub-modules in series, and each sub-module is composed of a diode D, a capacitor C, an IGBT switch K and an MOV arrester;

[0051] The diodes include: a first diode and a second diode; the parallel circuit formed by the first diode, the capacitor C and the switch is forwardly connected in series; the second diode and the switch are reversely connected in parallel.

[0052]The controllable unloading circuit is composed of N controllable unloading modules in series, and each sub-module is composed of a diode D, a capacitor C...

Embodiment 2

[0074] This embodiment provides a control method for a modular controllable unloading circuit, including:

[0075] Connect multiple controllable unloading modules in series between pole lines of DC transmission lines;

[0076] When excess energy occurs in the direct current transmission line, the capacitor of the controllable unloading module absorbs excess energy in the direct current transmission line;

[0077] The MOV arrester in the controllable unloading module controls the corresponding switch to close on the basis of maintaining voltage stability.

[0078] Before the MOV arrester in the controllable unloading module controls the closing of the corresponding switch on the basis of maintaining voltage stability, it also includes:

[0079] Sets the minimum residual voltage of the MOV arrester.

[0080] The MOV arrester in the controllable unloading module controls the corresponding switch to close on the basis of maintaining voltage stability, including:

[0081] When a...

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PUM

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Abstract

The invention relates to a modular controllable unloading circuit and a control method. The controllable unloading circuit is connected in series between polar lines of a DC transmission line, and comprises a plurality of controllable unloading modules which are connected in series. Each controllable unloading module comprises a capacitor, a switch and an MOV lightning arrester, and the switch isconnected with the MOV lightning arrester in series and then is connected with the capacitor in parallel. The circuit provided by the scheme comprises the controllable unloading module, and when the direct-currentDC system operates normally or disturbance and faults occur, the controllable unloading module can control the energy consumption power in the circuit, so that the balanced operation of the whole DC power transmission system is maintained.

Description

technical field [0001] The invention relates to the field of direct current transmission energy transfer, in particular to a modular controllable unloading circuit and a control method. Background technique [0002] The direct current transmission line can efficiently and conveniently transmit a large amount of electric energy from the energy base to the load center. The structure diagram of the direct current transmission line is shown in figure 2 As shown, for a DC power transmission project in operation, the electric energy consumed by the receiving end is balanced with the electric energy generated by the sending end, and the voltage and operating frequency of the power grid at the sending end remain constant. When the power system at the receiving end is disturbed or fails and cannot absorb the electric energy sent by the sending end, the voltage and frequency of the sending end power grid will be disturbed, and this disturbance can be reduced by quickly adjusting the o...

Claims

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Application Information

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IPC IPC(8): H02J3/14H02J3/24H02J3/36
CPCH02J3/14H02J3/24H02J3/36Y04S20/222Y02E60/60Y02B70/3225
Inventor 张静许彬高冲赵岩谢剑周建辉巩少岩董巍张娟娟
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD