Three-section type control strategy for back-to-back converter station

A control strategy, converter station technology, applied in the direction of AC network circuits, power transmission AC networks, electrical components, etc., can solve the problems of low frequency load shedding, the frequency response ability is very different, and achieve rich capabilities and means, accurate power improvement. capability, the effect of improving stability and reliability

Active Publication Date: 2021-01-22
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] For the DC asynchronous interconnection grid, the frequency response capabilities of the grids with different installed scales at both ends are very different and they operate independently. The probability of the frequency before and after the fault is at a low level increases, and low-frequency load shedding is prone to occur.

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  • Three-section type control strategy for back-to-back converter station
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  • Three-section type control strategy for back-to-back converter station

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation, but it is not intended as a limitation of the present invention.

[0041] An active control strategy for a back-to-back DC interconnection system under high power loss, the strategy includes:

[0042] Step 1: Establish a two-area three-unit model of the back-to-back DC interconnection system, and its structure diagram is as follows figure 1 As shown, the power system is divided into two research systems, research system 1 is the disturbance occurrence area, research system 2 is the non-disturbance occurrence area, research system 1 is further divided into subsystem A and subsystem B, and the disturbance occurrence area The internal subsystem A and subsystem B are connected through the AC tie line. The back-to-back converter station is used as the HVDC tie line of the research system at both ends of the weak connection. One end of the back-to-b...

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Abstract

A three-section type control strategy for a back-to-back converter station is applied to an interconnected large power grid of back-to-back direct current engineering. The strategy comprises the steps: establishing a two-region three-unit model in consideration of spatial distribution and geographic positions of the back-to-back converter station in alternating current systems at two ends, and performing modeling on a back-to-back direct current system in the two-region three-unit model, wherein the back-to-back direct current system comprises back-to-back converter station modeling and directcurrent additional controller modeling; dividing the frequency response stage into three different stages according to different attribute characteristics of the disturbed frequency response stage, and respectively implementing an active control strategy based on a model prediction controller, an active control strategy based on a stepped controller and a passive control strategy based on a PI controller for the three stages. Through the rapid controllability of the back-to-back direct-current power transmission system, the direct-current power is rapidly transmitted to the disturbance area from the non-disturbance area, the frequency descending trend is effectively intercepted, and the redistribution of the power vacancy is realized.

Description

technical field [0001] The invention belongs to the field of power grid frequency stability control, and relates to a three-stage control strategy for back-to-back converter stations. Background technique [0002] In recent years, the energy interaction of the power system has become more and more close. UHV transmission projects have fast and flexible transmission, low line loss, and low land occupation costs. DC mode change. Compared with the AC interconnection grid, the DC transmission project does not have the stability problem of AC transmission, which is conducive to long-distance large-scale power transmission; realizes asynchronous networking between power systems, which is conducive to the sharing of spare capacity between regions; implements fast and accurate frequency response The control strategy is beneficial to the power support of the non-disturbed area after the disturbance to the disturbed area and the frequency adjustment capability of the opposite end. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/36H02J3/241H02J2003/365Y02E60/60
Inventor 李卫东吴限李梓锋
Owner DALIAN UNIV OF TECH
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