Control method of power transfer belt for symmetrical bipolar flexible direct current transmission converter
A flexible DC power transmission and control method technology, applied in the direction of AC network circuits, circuit devices, electrical components, etc., can solve problems such as tripping and DC bus voltage fluctuations, and achieve the effect of reducing the impact degree, avoiding tripping, and improving power supply reliability.
Active Publication Date: 2019-12-27
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology
The above research contents all believe that the flexible DC transmission system can quickly realize the active power change, step or even reverse, but according to the test data of the domestic flexible DC transmission project, it is found that when the active power command changes rapidly, the DC bus voltage will fluctuate. Even cause the DC overvoltage protection action to trip
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[0044] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0045] Such as figure 1 As shown, a symmetrical bipolar flexible direct current transmission converter power transfer control method of the present invention includes the following steps,
[0046] Step 1: Judging whether the symmetrical bipolar flexible DC transmission converter can perform power transfer according to the feasibility condition of power transfer;
[0047] Step 2: According to the fault pole power P a , non-fault pole power P b , unipolar rated power P N The numerical calculation of the transferred power amount Δ P ;
[0048] Step 3: Block the converter of the faulty pole, disconnect the switch of the metal return line of the faulty pole, and make the system switch to the single-end grounding operation mode of single-pole with metal return line;
[0049] Step 4: Increase the power of the non-faulty pole to the fix...
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The invention relates to a power band transfer control method for a symmetric bipolar flexible direct current transmission converter. The method comprises the steps of firstly, when the symmetric bipolar connected flexible direct current transmission converter has a monopolar fault, judging whether the converter adopts a bipolar band metallic return single-end earthed operation mode and the non-fault pole adopts a bipolar power control mode; if so, calculating the transferred band power quantity according to the fault pole power Pa, the non-fault pole power Pb and the monopolar rated power PN, wherein the transferred band power quantity is equal to the smaller value in the Pa and the PN-Pb; secondly, shutting the fault pole converter, and disconnecting a fault pole metallic return switch, so that the system is turned to a monopolar band metallic return single-end earthed operation mode; thirdly, establishing a real-time simulation model according to equipment parameters of the converter, and calculating a constant power band transfer rate value PN / t1 by simulation; and finally, increasing the non-fault pole power to Pb + delta P according to the constant power band transfer rate value. The invention is aimed at providing a power band transfer control method and a theoretical basis when the symmetric bipolar converter has a monopolar fault.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission, and belongs to the control technology of a modular multilevel converter using symmetrical bipolar wiring, specifically, after a single pole fault occurs in a symmetrical bipolar converter, the power of the faulty pole is transferred to a non-faulty pole extreme control method. Background technique [0002] The flexible DC transmission system using symmetrical bipolar wiring has a flexible operation mode. Pole I and pole II can be operated as a whole or separately. Under normal working conditions, the system adopts the single-end grounding operation mode of bipolar with metal return line, and the unbalanced current of the two poles is returned through the metal return line. When a single pole fails, the converter valve of the faulty pole is blocked and shut down, and at the same time, all or part of the power of the faulty pole is transferred to the normal pole. The ...
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IPC IPC(8): H02J3/36H02H7/26
CPCH02H7/268H02J3/36H02J2003/365H02J2203/20Y02E60/60
Inventor 李超唐志军林国栋石吉银胡文旺陈锦山晁武杰郭健生
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD