Method for optimizing parameters of low-voltage current-limiting controller of weak receiving terminal power network direct-current transmission system

A DC transmission system, low-voltage current limiting technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, power transmission AC network, electrical components, etc., can solve DC system continuous commutation failure, AC voltage and DC power cannot be restored, lack of systematic calculation methods, etc.

Active Publication Date: 2017-01-25
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially for the DC weak receiving end power grid, improper setting of VDCOL control parameters may lead to continuous commutation failure of the DC system during the power grid failure and recovery period, the AC voltage and DC power cannot be restored, and in severe cases, the system will cause transient instability or voltage instability.
At present, the VDCOL control parameters of the DC transmission system are mainly determined by the staff after on-site debugging, and there is a lack of systematic calculation methods

Method used

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  • Method for optimizing parameters of low-voltage current-limiting controller of weak receiving terminal power network direct-current transmission system
  • Method for optimizing parameters of low-voltage current-limiting controller of weak receiving terminal power network direct-current transmission system
  • Method for optimizing parameters of low-voltage current-limiting controller of weak receiving terminal power network direct-current transmission system

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Embodiment Construction

[0036] Such as figure 1 Shown is the flow chart of the inventive method, below in conjunction with figure 1 and oneAn embodiment further illustrates the inventive method:

[0037] Select the Jiuhu UHV DC transmission project as an example. Jiuhu UHVDC starts from Jiuquan Converter Station in Gansu Province in the west and Xiangtan Converter Station in Hunan Province in the east. The transmission distance is about 2413km, the rated voltage is ±800kV, and the rated power is 8000MW. The VDCOL control characteristics adopted by the Jiuhu UHVDC transmission system are as follows: figure 2 shown. According to the present invention, the optimal design of the VDCOL control parameters of the Jiuhu UHVDC transmission system is carried out, and the main steps are as follows:

[0038] 1) Establish a simulation data platform for AC-DC hybrid power system. Based on the PSD-PSMODEL simulation platform, the electromagnetic transient simulation model of the Jiuhu UHVDC transmission sys...

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Abstract

The invention discloses a method for optimizing parameters of a low-voltage current-limiting controller of a weak receiving terminal power network direct-current transmission system. The method comprises the following steps: establishing a simulated data platform; setting a running mode and a fault disturbance set; establishing an optimized model object function by adopting a particle swarm optimization algorithm; initializing a particle swarm, an optimum position of each particle and an optimum position of the particle swarm; starting iteration and updating the position and speed of each particle; calculating fitness of each particle; updating an optimum position through which each particle passes and an optimum position through which the particle swarm passes; and repeating the steps to obtain a parameter optimization result. According to the method disclosed by the invention, the establishment of the simulated data platform enables the optimized model object function to be able to accurately reflect the influence of VDCOL control parameters on safe and stable characteristics of an AC-DC power network, so that the parameters optimized by the method disclosed by the invention can achieve a better control effect under the condition with different running modes, faults and disturbance of a weak receiving terminal power network, thereby improving restoration characteristics of an AC-DC system, and promoting the safety and reliability levels of the system.

Description

technical field [0001] The invention specifically relates to a parameter optimization method of a low-voltage current-limiting controller of a weak-receiving-end power grid direct current transmission system. Background technique [0002] High-voltage direct current transmission (HVDC) has the advantages of fast power regulation and reliable operation, and is suitable for long-distance, large-capacity power transmission and interconnection of large power grids, so it is being used more and more all over the world. The low voltage current limiting controller (Voltage Dependent Current Order Limiter, VDCOL) is an important part of the HVDC control system. Reactive power requirements, reducing the probability of DC commutation failure, and improving the recovery characteristics of the AC-DC system. [0003] At present, most DC transmission projects use DC voltage type VDCOL, and its control characteristics are mainly determined by the DC high voltage threshold value U high , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02J3/36
CPCH02H9/02H02J3/36H02J2203/20Y02E60/60
Inventor 章德李梦骄肖帅廖国栋陈耀红谢欣涛侯益灵杨高才
Owner STATE GRID CORP OF CHINA
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