Automatic power grid resonance detection method based on active injection current

An automatic detection and current injection technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inability to realize fast online automatic detection and poor accuracy, achieve strong field adaptability and improve detection speed , the effect of simple operation

Active Publication Date: 2015-02-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide an automatic detection method for grid resonance based on active

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  • Automatic power grid resonance detection method based on active injection current
  • Automatic power grid resonance detection method based on active injection current
  • Automatic power grid resonance detection method based on active injection current

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] In view of the shortcomings of the traditional detection method of power grid resonance, such as poor accuracy, inability to realize rapid online automatic detection function, high cost of detection tools, and poor field adaptability, the present invention provides an active power quality adjustment device, By injecting a reference current with a specific waveform into the grid at one time, and establishing a detection model according to the spectrum characteristics of the operating parameters of the grid system, a fast and accurate automatic detection method for the resonance frequency and r...

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Abstract

The invention discloses an automatic power grid resonance detection method based on active injection current. For the problems of harmonic pollution due to a nonlinear load in a power system and resonance easy occurring when a reactive compensating capacitor is connected in the power system, an active power quality regulating device connected in the power grid in parallel is used for compensating the harmonic, and meanwhile, the active power quality regulating device is used for injecting reactive and harmonic combined current of a specific waveform into the power grid to automatically detect the resonance angular frequency and the damping coefficient of the power grid; for a single-phase system, the rectangular wave current of 180 degrees is injected; for a three-phase system, the rectangular wave current of 120 degrees is injected. According to the automatic power grid resonance detection method based on the active injection current, the resonance detection combined model of the optimal weight algorithm is established according to the harmonic voltage and the harmonic current of the power grid and spectral characteristics of the harmonic power, and then the resonance angular frequency and the damping degree of the power grid can be judged quickly and accurately; as a result, application basis is provided for the damping control of the power grid resonance and the power quality of the power system is further improved.

Description

technical field [0001] The invention belongs to the field of electric energy quality control, and more specifically relates to an automatic detection method for grid resonance based on active injection current. Background technique [0002] Parallel capacitors for reactive power compensation is a very common power factor correction method, which occupies a dominant position in the field of reactive power compensation in the industrial field. In the power system, capacitors of corresponding capacity are usually put in according to different load levels to improve the power factor of the system, increase the voltage level of the transmission line, and at the same time reduce the loss of the power grid and eliminate overload. [0003] With the wide application of nonlinear loads such as various power electronic devices, the harmonic current in the power grid is increasing day by day, and the harmonic voltage drop will be generated when the harmonic current flows through the lin...

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Application Information

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IPC IPC(8): G01R23/16G01R31/02
Inventor 戴珂陈新文彭力刘源康勇徐晨
Owner HUAZHONG UNIV OF SCI & TECH
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