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Method for estimating parallel resonance frequency of direct current transmission island system

A resonant frequency and islanding technology, applied in the direction of power transmission AC network, etc., can solve the problems of weak AC system, parallel resonance of inductive components and capacitive components, low short-circuit capacity and short-circuit ratio, etc., to achieve the effect of improving accuracy

Active Publication Date: 2014-09-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0004] However, under the isolated island operation mode of the sending end of the DC transmission system, the AC system is generally weak, and the short-circuit capacity and short-circuit ratio are low. Risk of Parallel Resonance

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  • Method for estimating parallel resonance frequency of direct current transmission island system
  • Method for estimating parallel resonance frequency of direct current transmission island system
  • Method for estimating parallel resonance frequency of direct current transmission island system

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Embodiment Construction

[0026] The method for estimating the parallel resonant frequency of the isolated island system at the DC sending end in consideration of line charging reactive power proposed by the present invention has the following specific implementation methods:

[0027] 1) In power system analysis programs such as BPA or PSS / E, establish the data for calculating the short-circuit current of the AC power grid in the island system, including data such as generators, transformers, and lines, which include line charging reactive power, but do not include commutation Station reactive power compensation;

[0028] 2) Use power system analysis programs such as BPA or PSS / E to calculate the short-circuit capacity S of the converter bus AC ;

[0029] 3) Calculate the reactive power compensation capacity Q of the converter station according to the parameters of the reactive power compensation equipment of the converter station Filter , Calculate the total charging reactive power capacity Q of the...

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Abstract

The invention provides a method for estimating the parallel resonance frequency of a direct current transmission island system. The method for estimating the parallel resonance frequency of the direct current transmission island system comprises the steps that (1) data used for calculating the short circuit current of an alternating-current power grid in the island system are established; (2) the capacity of short circuit of a current converting bus is calculated: (3) the reactive compensation capacity of a current converting station and the circuit charging reactive capacity are calculated; (4) the parallel resonance frequency is calculated according to the fundamental frequency, the capacity of short circuit of the alternating-current system, the reactive compensation capacity of the current converting station and the circuit charging reactive capacity. According to the method for estimating the parallel resonance frequency of the direct current transmission island system, the charging capacitance of a circuit is considered when the resonance frequency is estimated, the obtained parallel resonance frequency is closer to the actual condition, and thus the estimated resonance frequency can be more accurate.

Description

technical field [0001] The invention belongs to the field of power system calculation and analysis, and relates to a method for estimating the parallel resonance frequency of a power grid, and more specifically relates to a method for estimating the parallel resonance frequency of a DC sending-end island system considering reactive power of line charging, and belongs to the method of estimating the parallel connection of a DC sending-end island system The innovative technology of the method of resonant frequency. Background technique [0002] Due to its technical and economic characteristics, HV and UHV DC transmission technologies are widely used in long-distance and large-capacity transmission. The capacity of DC transmission projects is generally large. If a DC blocking fault occurs during network operation, the DC power will be transferred to the AC channel running in parallel, causing the risk of system instability. It is necessary for the safety and stability control s...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 赵勇
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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