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Frequency measuring method and system of distribution type power supply environment

A distributed power supply and frequency measurement technology, which is applied in the direction of frequency measurement devices, etc., to achieve accurate measurement, reduce harmonic interference, and improve accuracy

Active Publication Date: 2016-05-11
MAOMING POWER SUPPLY BUREAU GUANGDONG POWER GRID CORP
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Problems solved by technology

[0004] Based on this, it is necessary to provide an accurate frequency measurement method and system for the distributed power environment to solve the problem of large errors in the frequency measurement method of the existing distributed power environment

Method used

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  • Frequency measuring method and system of distribution type power supply environment
  • Frequency measuring method and system of distribution type power supply environment
  • Frequency measuring method and system of distribution type power supply environment

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Embodiment Construction

[0025] like figure 1 As shown, a frequency measurement method for a distributed power supply environment, including steps:

[0026] S100: Sampling the grid voltage based on a preset standard frequency.

[0027] The preset standard frequency is a preset frequency, which can be set according to the requirement of frequency measurement or the application environment. The preset standard frequency can be set to 45HZ, 50HZ and 55HZ etc. The voltage standard frequency in my country's power grid is generally 50HZ, therefore, the preferred preset standard frequency is 50HZ.

[0028] S200: Obtain the voltage phase of the lth sample and the voltage phase of the l-1th sample of the grid voltage by using complex-valued wavelet transform, where l is a positive integer.

[0029] The complex wavelet has very high resolution in the time domain and frequency domain. In addition to calculating the corresponding amplitude, the phase value can also be calculated. At the same time, due to the a...

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Abstract

The invention provides a frequency measuring method and a system of a distribution type power supply environment. The method comprises steps of sampling voltage of a power grid based on preset standard frequency; respectively obtaining voltage phase positions sampled at the 1st time and voltage phase positions sampled at the 1-1 time by use of complex value wavelet transform; and calculating voltage frequency according to the voltage phase positions sampled at the 1st time, the voltage phase positions sampled at the 1-1 time and a voltage frequency weighting calculation formula. In this way, the voltage phase positions of sampling voltage can be precisely obtained by use of the complex value wavelet transform; distributed power supply harmonic interference is reduced; precision of phase position information is greatly improved; and by performing voltage frequency weighting calculation, rapid and precise measurement of frequency of the power grid can be achieved.

Description

technical field [0001] The invention relates to the technical field of distributed power monitoring, in particular to a frequency measurement method and system for a distributed power environment. Background technique [0002] In recent years, with the continuous progress and development of new energy technologies, a large number of distributed power sources have been widely connected to the power grid system. While improving the flexibility of power supply and bringing economic and environmental protection advantages, it also brings many challenges to the operation and maintenance of the power grid. A new problem, accurate and fast frequency measurement is an important part of evaluating the operating status of distributed power sources and realizing island detection. [0003] General frequency measurement mainly includes the hardware frequency measurement method based on phase-locked loop technology, and the software measurement method based on Fourier transform. The hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 朱子坤王清玲朱广名胡铁斌陈宏辉贺臣赵必游曾建鑫周聪卢文冰甄冲苑佳楠
Owner MAOMING POWER SUPPLY BUREAU GUANGDONG POWER GRID CORP
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