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A Control Strategy Optimization Method for Flexible HVDC Transmission System to Improve Transient Power Angle Stability

A flexible DC power transmission and transient stability technology, applied in AC network circuits, AC network voltage adjustment, circuit devices, etc., can solve the problems of lack of mature experience in the design of large-capacity flexible DC control strategies, and achieve improved dynamic reactive power support capabilities , Reduce the speed of active power recovery and improve the effect of power transmission capacity

Active Publication Date: 2020-11-17
NARI TECH CO LTD +3
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  • Application Information

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Problems solved by technology

[0003] Flexible DC transmission technology will enter a stage of rapid development of large-capacity. However, there is a lack of mature experience in the design of large-capacity flexible DC control strategies. important

Method used

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  • A Control Strategy Optimization Method for Flexible HVDC Transmission System to Improve Transient Power Angle Stability

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Embodiment Construction

[0031] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0032] like figure 1 As shown, a control strategy optimization method for flexible direct current transmission system to improve transient power angle stability can improve the transient stability of the flexible DC transmission system and improve the transmission capacity of the system under the constraints of transient stability, which specifically includes the following steps:

[0033] Step 1. Obtain the key control parameters of the AC fault ride-through strategy of the flexible DC transmission system, including the voltage threshold U for entering the AC fault ride-through thin , Active current limit of HVDC system during AC fault ride-throug...

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Abstract

The invention discloses a flexible DC power transmission system control strategy optimization method for enhancing transient power angle stability. 1, The control parameters of the flexible DC power transmission system AC fault ride-through strategy are acquired; 2, the typical operation mode of the power grid is acquired, transient stability time domain simulation under the expected fault is performed, and the instability fault is added to a transient instability fault set F; 3, a fault set Fc of the transient power angle stability associated with the flexible DC control strategy is acquiredfrom F; 4, the short circuit duration of each expected fault of the fault set Fc is acquired, the minimum value of the flexible DC power transmission system AC control point voltage is Ufc-i, and theparameter Ufc=max{Ufc-i}+0.05 is taken; 5, if Uthin<Ufc, Uthin is enabled to be equal to Ufc, and transient stability time domain simulation is performed on each expected fault in the fault set Fc again; and 6, if the system maintains transient stability under each expected fault in the fault set Fc, optimization is ended, and the current Uthin, idlim, iqlim and Uthout are the optimization parameters.

Description

technical field [0001] The invention relates to a control strategy optimization method for a flexible direct current transmission system that improves transient power angle stability. Background technique [0002] Flexible DC transmission technology is a DC transmission technology based on fully-controlled semiconductor devices. Compared with conventional DC transmission technology based on semi-controlled devices for grid self-commutation, flexible DC transmission technology does not have the problem of commutation failure and can achieve active power. and reactive power decoupling control, flexible power flow reversal control, and good damping performance. Its large-capacity power transmission technology has also developed rapidly in recent years. In recent years, my country has built Xiamen flexible DC, Luxi back-to-back flexible DC and other large-capacity Flexible direct current transmission project, during the "Thirteenth Five-Year Plan" period, my country will also buil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 李兆伟谭真王玉吴雪莲刘福锁李威崔晓丹侯玉强贺静波于钊张怡何飞黄慧罗峰常海军朱玲张子龙张倩何哲胡阳赵学茂
Owner NARI TECH CO LTD
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