Quasi-synchronous wideband reactive energy meter based on Hilbert algorithm and sampling method thereof

A quasi-synchronized, electric energy meter technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve the problems of principle defects, low accuracy, and narrow applicable frequency range of the main circuit of the measurement, and achieve superior frequency response characteristics, high The effect of measuring accuracy

Inactive Publication Date: 2012-06-13
ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER +1
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Problems solved by technology

However, the main measurement circuit of the induction system measurement mechanism has a principle defect, which determ

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The present invention will be further described below in conjunction with the accompanying drawings.

1. IIR type Hilbert digital filter

Digital filters can be divided into infinite impulse response filters (Infinite Impulse Response, IIR) and finite impulse response filters (Finite Impulse Response, FIR) in terms of implementation methods. They are distinguished by the characteristics of the unit sample response h(n), the h(n) of the IIR filter is an infinite-length sequence, and the h(n) of the FIR filter is a finite-length sequence.

The principle block diagram of the reactive power measurement method of the IIR type Hilbert digital phase-shift filter is shown in Figure 1. Firstly, the voltage and current signals of a certain phase on the power grid are A / D converted at the same sampling rate to obtain discrete digital voltage signal u(n) and digital current signal i(n); secondly, the pair of digital The signals are phase-shifted through the F1 and F2 filters respectively...

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Abstract

The invention discloses a quasi-synchronous wideband reactive energy meter based on a Hilbert algorithm. The energy meter comprises: an analog-to-digital conventer, a multiplier and a low pass filter. The energy meter is characterized in that: the energy meter also comprises: a digital broadband phase shift filter, a display, a digital sampler and a logic controller; the analog-to-digital conventer, digital broadband phase shift filter, the multiplier, the low pass filter and the display are successively connected; the digital sampler is connected with the logic controller; the logic controller is connected with and controls the multiplier, the low pass filter and the display respectively. The energy meter uses instantaneous reactive power after digit phase shift filtering via an IIR type Hilbert digital filter to perform the low pass filtering. A direct current component in which a fluctuation part is removed is the reactive power which needs to be measures. Measuring accuracy is high. The energy meter is suitable for being used in designing a high-precision reactive power measuring instrument.

Description

technical field The invention belongs to the technical field of power parameter measurement, in particular to a quasi-synchronous broadband reactive energy meter based on the Hilbert algorithm and a sampling method thereof. Background technique At present, there are many algorithms for measuring reactive power or electric energy, such as root mean square algorithm, Fourier algorithm, digital phase shift algorithm, Hilbert algorithm, wavelet transform algorithm, and so on. The third and higher harmonics can be measured using these algorithms, and the measurement results of the Hilbert algorithm are more accurate. It is suitable for use in the design of high-precision reactive power measuring instruments. Articles "Reactive Power Measurement Method Based on 2 Pairs of Hilbert Phase-Shifting Filters" ("Power System Automation" 2006 No. 18) and "Using Wavelet Transform and Hilbert Transform to Measure Reactive Power" ("Journal of System Simulation" 2005 No. 4) all describe the...

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Application Information

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IPC IPC(8): G01R11/52G01R22/10
Inventor 孙健王忠东熊杰锋关巧莉王宝安
Owner ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER
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