A phasor measurement device laboratory calibrator and a phasor measurement method thereof

A technology of synchrophasor measurement and synchronous measurement, which is applied in measurement devices, frequency measurement devices, measurement of electrical variables, etc., can solve the problems of low algorithm complexity, high real-time performance, and low measurement accuracy, and achieves high hardware accuracy, Good effect of harmonic and inter-harmonic interference

Active Publication Date: 2018-11-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the measurement accuracy of the calibrator, research can be carried out from the aspects of hardware and software; in terms of hardware, boards with higher precision can be selected to reduce errors; in terms of software, the real-time performance of the current synchrophasor measurement algorithm

Method used

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  • A phasor measurement device laboratory calibrator and a phasor measurement method thereof
  • A phasor measurement device laboratory calibrator and a phasor measurement method thereof
  • A phasor measurement device laboratory calibrator and a phasor measurement method thereof

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Embodiment 1

[0147] The laboratory calibrator of the synchronous measuring device provided by the present invention is tested with hardware in the following specific examples. Specifically, the static and dynamic test signals specified in the synchronous measuring device test standard include: scanning test with rated frequency amplitude, frequency offset Steady state test represented by harmonic test, out-of-band test; dynamic test represented by amplitude modulation test, phase angle modulation test, amplitude phase angle simultaneous modulation test and frequency ramp test. Present embodiment is as follows to the test condition of above-mentioned each test:

[0148] 1. Rated frequency and amplitude scanning test: the signal frequency is 50Hz, the amplitude is 0.1Un~2.0Un (Un=57.73V), and the three-phase symmetrical voltage signal is sent to the signal acquisition module of the calibrator;

[0149] 2. Frequency offset test: the amplitude is Un, the signal frequency is 45Hz~55Hz, and the ...

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Abstract

The invention provides a phasor measurement device laboratory calibrator and a phasor measurement method thereof which belongs to the technical field of phasor measurement and phasor measurement device test. The system includes a GPS synchronous time service module, a signal collection module and a controller module; the measurement method includes: model selection is performed on a hardware, influence of hardware error to phasor measurement is disclosed by utilizing an error transmission theory; measurement is performed by utilizing an improved energy center of gravity method and an improvedDFT algorithm during stable state test, a non-linear fitting model is constructed during dynamic test, solving is performed by utilizing a Gauss-Newton method, polynomial fitting is adopted for solving a frequency change rate of static and dynamic test signals. The calibrator can work reliably, and can limit influence on phasor measurement precision by a collection system within a small range andprovide a high precision reference value for error analysis. The measurement method makes the phasor measurement accuracy more than four times higher than an error standard, and has a good inhibitioneffect on harmonic wave and inter-harmonics interference.

Description

technical field [0001] The invention belongs to the technical field of synchronous phasor measurement and synchronous measurement device testing, and in particular relates to a synchronous measurement device laboratory calibrator and a synchronous phasor measurement method thereof. Background technique [0002] Synchronous measurement devices such as synchrophasor measurement unit (PMU) are effective tools for monitoring dynamic changes in power systems, and their measurement data play an increasingly important role in model verification, state estimation and oscillation monitoring. In order to ensure that the above applications can work effectively and reliably, it is necessary to test the accuracy of synchronous measurement devices such as PMUs to determine their measurement accuracy under static and dynamic conditions of the power system. At present, there are two types of synchronous measurement device test systems at home and abroad, one of which is a synchronous measur...

Claims

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Application Information

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IPC IPC(8): G01R35/00G01R23/02G01R23/16G01R25/00
CPCG01R23/02G01R23/16G01R25/00G01R35/005
Inventor 刘灏毕天姝许苏迪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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