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Control method and control device for high-low valve type flexible direct current transmission system

A technology of power transmission system and flexible DC, applied in the direction of power transmission AC network, etc., can solve the problems of uneven current and uneven voltage, etc.

Active Publication Date: 2019-09-06
TBEA SUNOASIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a control method for a high-low valve type flexible direct current transmission system and a control device for a high-low valve type flexible direct current transmission system, which can solve the above-mentioned defects in the prior art. Problems of uneven pressure and uneven flow in existing control methods of valve systems

Method used

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  • Control method and control device for high-low valve type flexible direct current transmission system
  • Control method and control device for high-low valve type flexible direct current transmission system
  • Control method and control device for high-low valve type flexible direct current transmission system

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Embodiment 1

[0078] Such as Figure 13 As shown, this embodiment provides a control method for a high-low valve type flexible direct current transmission system, including the following steps S101-S106.

[0079] S101. Acquiring the active current compensation amount for pressure equalization between valves.

[0080] The step S101 specifically includes the following steps S101-1 to S101-3.

[0081] S101-1. For the active power control side, obtain the average value and measured value of the DC voltage of the single converter valve at the same pole, and compare the two to obtain the error amount of the DC voltage of the converter valve;

[0082] S101-2. Calculate the error amount of the DC voltage of the converter valve through the inter-valve pressure equalization controller to obtain the compensation amount of the d-axis current;

[0083] S101-3. According to the power transmission direction, the positive or negative of the DC side voltage error of the converter valve, and the preset sup...

Embodiment 2

[0119] This embodiment provides a control device for a high-low valve type flexible direct current transmission system. Such as Figure 14 As shown, the control device includes a first acquisition unit 100 , a second acquisition unit 200 , a third acquisition unit 300 and a superposition unit 400 .

[0120] The first acquisition unit 100 is used to obtain the active current compensation amount that acts as the pressure equalization function between valves; the superposition unit 400 is used to superimpose the active current compensation amount that functions as the pressure equalization function between valves and the active current component output by the active power control outer loop The input current controls the inner loop to dynamically adjust the active current to achieve voltage equalization on the active power control side;

[0121] The second acquisition unit 200 is used to acquire the active current compensation amount that acts as a current equalization between v...

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Abstract

The invention provides a method for controlling a high / low valve type flexible direct-current transmission system. The method comprises the following steps: acquiring active current compensation quantity of voltage-sharing effects among start valves, superimposing the active current compensation quantity of the voltage-sharing effects among start valves with an active current component output by an active power control outer ring so as to input into a current control inner ring, and dynamically adjusting the active current so as to realize voltage-sharing on the active power control side; and acquiring active current compensation quantity of voltage-sharing effects among start valves, superimposing the active current compensation quantity of the voltage-sharing effects among start valves with an active current component output by a direct-current voltage control outer ring so as to input into the current control inner ring, and dynamically adjusting the active current so as to realize voltage-sharing on the direct-current voltage control side. Correspondingly, the invention provides a device for controlling the high / low valve type flexible direct-current transmission system. According to the method and the device provided by the invention, the non-voltage-sharing and non-current-sharing problems existing in the existing method for controlling the high / low valve system can be solved.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a control method for a high-low valve type flexible direct current transmission system, and a control device for a high-low valve type flexible direct current transmission system. Background technique [0002] Flexible DC transmission systems widely adopt modular multi-level structures to adapt to high-voltage, high-power applications. However, with the further increase of voltage and capacity, not only the converter valve part needs to consider the voltage and current withstand capacity of the device, but also the power equipment such as the converter transformer that is matched with the converter valve. In addition, factors such as manufacturing process and transportation method must also be considered. [0003] Due to the constraints of various factors, in the case of ultra-high pressure, the form of a converter valve is often unable to meet the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
Inventor 侯丹刘伟增郝翔刘汉军汤明杰李辰
Owner TBEA SUNOASIS
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