A power grid frequency metering and measuring device and method based on half-cycle phase-shifting method

A technology for power grid frequency and measuring devices, which is applied in the direction of frequency measuring devices, frequency to phase shift conversion, etc., and can solve the problems of large storage overhead, large calculation amount, and long sampling time of single-chip microcomputers

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

But it requires a long sampling time and requires two complete periodic signals
[0010] (3) The real-time measurement technology of power grid frequency based on the amplitude has a large amount of calculation and a large storage cost for the single-chip microcomputer

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  • A power grid frequency metering and measuring device and method based on half-cycle phase-shifting method
  • A power grid frequency metering and measuring device and method based on half-cycle phase-shifting method
  • A power grid frequency metering and measuring device and method based on half-cycle phase-shifting method

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Embodiment Construction

[0065]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.

[0066] Voltage harmonics, non-periodic components in the transient process and noise interference are the main reasons for the low accuracy of power grid frequency measurement. For a stable sinusoidal AC signal, the pulse counting method can complete the frequency measurement with a certain accuracy. However, for voltage signals containing high-order harmonics, complex hardware filter circuits must be added, otherwise the pulse hardware counting method will lose the test significance, and the hardware cost will become higher and the difficulty will increase. In occasions that do not require high precision, the frequency of ...

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Abstract

The invention belongs to the technical field of power grid equipment and parameter processing, and discloses a power grid frequency measurement and measurement device and method based on a half-cycle phase-shifting method. The power grid frequency measurement and measurement device based on a half-cycle phase-shifting method includes: voltage sampling and conditioning Circuit module, AD acquisition system, frequency calculation module, voltage sampling and conditioning circuit module includes: voltage sampling module, using 100 / 3.53 isolation transformer, connects PT output voltage to voltage conditioning circuit; under 120% input voltage, AD is not saturated ; Conditioning circuit: using emitter follower circuit. The invention adopts 16-bit AD sampling, uses software and hardware combination method to realize fast, accurate and real-time measurement of grid frequency, and uses software and hardware combination processing mode to calculate grid frequency. Compared with the whole cycle phase shift method, this measurement technique only needs 1.5 power frequency cycles. The calculation frequency range is wide, and the test range is 45-65Hz. The calculation speed is fast; it is convenient for digitization.

Description

technical field [0001] The invention belongs to the technical field of grid equipment and parameter processing, and in particular relates to a grid frequency metering and measuring device and method based on a half-cycle phase-shifting method. Background technique [0002] Currently, the closest prior art: [0003] The frequency of the power grid has a great impact on the normal operation of the power system load; some loads in the power system and power plant loads have very strict requirements on frequency. To ensure the normal operation of users and power plants, the system frequency must be strictly controlled to keep the system frequency deviation within the allowable range. With the development of power system FACS, grid-connected power supply, live detection, on-line monitoring and other technologies, higher requirements are put forward for the fundamental frequency measurement of power system. [0004] Therefore, it is very necessary to develop fast and high-precis...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02G01R23/12
Inventor 刘春
Owner HUAZHONG UNIV OF SCI & TECH
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