A method and measuring device for detecting grid frequency based on dimensionality reduction observer
A dimensionality reduction observer and power grid frequency technology, applied in the direction of frequency measurement devices, can solve the problems of low reliability of power grid frequency measurement devices, and achieve the effect of avoiding calculation errors and improving reliability
Active Publication Date: 2019-10-11
XIDIAN UNIV
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[0003] To sum up, the problem existing in the prior art is: the reliability of the current power grid frequency measurement device is relatively low
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[0023] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0024] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] Such as figure 1 As shown, the method for detecting the grid frequency based on the dimensionality reduction observer provided by the embodiment of the present invention includes the following steps:
[0026] S101: Collect single-phase voltage of the power grid;
[0027] S102: constructing an observer and an adaptive law;
[0028] S103: Calculate the grid frequency.
[0029] Such as figure 2 As shown, the measuring device provided by the embodiment of the present invention...
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The invention belongs to the technical field of power grid frequency detection and provides a method of detecting the frequency of a power grid based on a reduced dimension observer and a measuring device. The method of detecting the frequency of a power grid based on a reduced dimension observer comprises the steps of collecting a single-phase voltage of a power grid; building an observer and a self-adaptive law; calculating the frequency of the power grid. The measuring device comprises a voltage sensor, a signal amplifier, a filter, a frequency detector and a serial port output module. The voltage sensor collects a single-phase voltage of a power grid; the collected signals are processed via the signal amplifier and the filter and then sent to the frequency detector; via estimation of the frequency detector, the frequency of the power grid is output via the serial port output module. The research target of the method is a power grid with permanent magnet synchronous motors as driving motors; the power grid frequency detection method and the measuring device solve the problem in power grid frequency detection and improve the reliability of a frequency measurement system.
Description
technical field [0001] The invention belongs to the technical field of power grid frequency detection, and in particular relates to a method and a measurement device for detecting power grid frequency based on a dimensionality reduction observer. Background technique [0002] Three-phase alternating current is a form of transmission of electrical energy, referred to as three-phase power. Three-phase AC power supply is a power supply composed of three AC potentials with the same frequency, equal amplitude, and 120° phase difference. The current achievements include: the patent "A Frequency Detection Method for Microgrid System" with the authorized announcement number CN102981049A proposes a power grid frequency measurement device. However, this device requires sampling and threshold determination, which reduces the measurement frequency system reliability. The sampling signal conveys discrete information, which leads to errors in calculating the initial frequency. [0003]...
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IPC IPC(8): G01R23/02
Inventor 马伯渊聂红祥张菊香戴志勇李建文候叶张杰
Owner XIDIAN UNIV