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Method for detecting power grid frequency by using optimal multiplier Newton algorithm

A Newton algorithm, grid frequency technology, applied in the direction of frequency measurement devices, etc., can solve the problem that the real-time and accuracy of grid frequency detection cannot be solved.

Inactive Publication Date: 2013-07-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods have improved to varying degrees in terms of accuracy, real-time performance, and anti-interference, they still cannot solve the main contradiction that the real-time and accuracy of power grid frequency detection are not uniform.

Method used

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  • Method for detecting power grid frequency by using optimal multiplier Newton algorithm
  • Method for detecting power grid frequency by using optimal multiplier Newton algorithm
  • Method for detecting power grid frequency by using optimal multiplier Newton algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052] Given a sinusoidal test signal, defined as follows:

[0053] t≤0.02s V=30 f=45Hz V 0 =0

[0054] t>0.02s V=35 f=50Hz V 0 =5

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Abstract

The invention discloses a method for detecting power grid frequency by using an optimal multiplier Newton algorithm. The method is characterized by being capable of simultaneously detecting a peak value of power grid voltage, a power grid frequency, a direct current component and an initial phase angle. The calculation is accurate when the frequency is perturbed greatly, the algorithm is simple, the convergence speed is high, the anti-jamming capability is strong and the method is suitable for online application.

Description

technical field [0001] The invention relates to a method for detecting the frequency of a grid by using an optimal multiplier Newton algorithm, which belongs to the field of automatic control of electric power systems. Background technique [0002] Grid frequency is one of the three major indicators for evaluating power quality, and it is also an important basis for implementing power system security and stability control. Therefore, grid frequency detection has become an important technology in the field of automatic control of power systems. [0003] At present, the more commonly used power grid frequency detection method is the original periodic method. This method detects the zero-crossing point of the voltage signal waveform and calculates the time interval between two adjacent zero-crossing points to calculate the frequency. This method has a clear physical concept and is easy to implement, but its accuracy is low, it is easily interfered by signals such as harmonics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 李兴源程丽敏甄威丁理杰赵睿刘天琪王渝红
Owner SICHUAN UNIV
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