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Active power flow optimizing distribution method for alternating-direct current parallel system containing soft direct current power transmission

A technology for flexible DC power transmission and optimized distribution, which is applied in the direction of DC network circuit devices, AC network circuits, electrical components, etc., and can solve the problems of lack of settings, and the active power flow of AC and DC parallel transmission lines has not been optimized.

Active Publication Date: 2013-10-23
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the P ref Due to the lack of theoretical support in the setting and the unoptimized active power flow of AC-DC parallel transmission lines, a method for optimal distribution of active power flow in AC-DC parallel transmission lines with flexible DC transmission is proposed

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  • Active power flow optimizing distribution method for alternating-direct current parallel system containing soft direct current power transmission
  • Active power flow optimizing distribution method for alternating-direct current parallel system containing soft direct current power transmission
  • Active power flow optimizing distribution method for alternating-direct current parallel system containing soft direct current power transmission

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0068] Taking the flexible DC transmission system connecting the AC system and the wind farm as an example, the AC and DC system is mainly responsible for transmitting the power of the wind farm to the grid. Such as figure 1 , the end connected to the converter VSC1 is the wind farm. Under normal circumstances, the converter VSC1 close to the wind farm adopts a constant active power control mode, and the converter VSC2 close to the grid adopts a customized DC voltage control mode. Parallel operation of AC and DC can not only give full play to the transmission advantages of the DC system, but also use the AC line to effectively balance the power of the receiving end system to prevent large fluctuations in the frequency of the receiving end system.

[0069] At present, the fixed value P of fixed activ...

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Abstract

The invention discloses an active power flow optimizing distribution method for an alternating-direct current parallel system containing soft direct current power transmission, and solves the reasonable distribution problem of the active power flow of the alternating-direct current system under the alternating-direct current parallel operation mode of the soft direct current power transmission. The method comprises the steps of obtaining basic parameters of a power grid to be analyzed; establishing corresponding target functions by taking factors such as alternating-direct current equipment loss, avoiding parallel loop current, the safety and stabilization of the power grid, the utilization rate of the alternating-direct current equipment and fault rate as target conditions according to the obtained basic parameters of the power grid; establishing multiple target optimization functions according to all established target functions; designing a subjection function for each target function according to the fuzzy theory; and resolving the optimal solution of the multiple target functions by adopting a fuzzy algorithm. The method considers the constrain of multiple target conditions, obtains the optimal active power control reference value under the alternating-direct current parallel operation of the soft direct current power transmission system by resolving the multi-target optimal function, and is more reasonable in comparison with the method relying on experience to set the active power reference value.

Description

technical field [0001] The present invention relates to the technical field of flexible direct current transmission systems in which alternating current and direct current lines operate in parallel, and more particularly relates to a method for optimal distribution of active power flows in alternating current and direct current parallel systems including flexible direct current transmission. Background technique [0002] Flexible DC transmission (VSC-HVDC) is a new type of power transmission and distribution technology. It takes IGBT fully controlled power electronic devices and PWM technology as the core. Compared with conventional HVDC, VSC-HVDC has independent decoupling of active power and reactive power. Control and switching devices can be turned off automatically without commutation failure, power flow reversal does not need to change the voltage polarity and many other advantages, and it can be connected to weak AC systems or passive networks, so it is currently widel...

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Application Information

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IPC IPC(8): H02J3/00H02J1/00
Inventor 文安邓健俊魏承志赵曼勇李建设寻斌斌曾勇刚田霖
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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