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Method and system for calculating electric energy and electric energy meter
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An electric energy meter, electric energy technology, applied in the direction of electric power measurement through current/voltage, etc., can solve the problems of inaccurate electric energy measurement and small dynamic range, and achieve the effect of improving accuracy and increasing range
Active Publication Date: 2013-05-08
SHENZHEN KE RUIGE ELECTRONICS
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[0006] The purpose of the embodiments of the present invention is to provide a method for calculating electric energy, aiming to solve the problem of inaccurate electric energy measurement in the prior art due to the small dynamic range of electric energy measurement
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Embodiment 1
[0044] This embodiment provides a method for calculating electric energy. The method provided by this embodiment is completed by the electric energy metering module in the electric energy meter. The circuit of the electric energy metering module is exactly the same as the existing electric energy metering circuit. The specific structure is as follows figure 1 As shown, the method is as image 3 shown, including the following steps:
[0045] S31. Sampling the waveform of the voltage and current signal to obtain a set of sampling points of the voltage and current signal;
[0046] S32. Perform DC filter processing on the set of sampling points;
[0047] It should be noted that it is assumed that the set of sampling points C={x(i),x(i+1),...,x(i+α-1)}, where α is the set window size (α is a power of 2 ), x(i), x(i+1),..., x(i+α-1) are sampling points; set C contains adjacent continuous α sampling points;
[0048] The method for implementing S32 may specifically be: performing D...
Embodiment 2
[0097] This embodiment provides an electric energy calculation system, the system is as Figure 4 shown, including:
[0098] The signal sampling unit 41 is configured to receive an input voltage and current signal, and perform waveform sampling on the voltage and current signal to obtain a set of sampling points of the voltage and current signal;
[0099] A filter unit 42, configured to perform DC filter processing on the set of sampling points;
[0100] A range switching unit 43, configured to perform range switching processing on the voltage and current signals after the DC filter processing;
[0102] A power calculation unit 45, configured to calculate the electric power of the voltage signal and the phase-corrected current signal;
[0103] The pulse generating unit 46 is configured to generate an output pulse when the electric energy power is accu...
Embodiment 3
[0118] This embodiment provides an electric energy meter, which includes the computing system for the electric energy meter provided in the second embodiment above. In addition, the electric energy meter can specifically be: 220V1 (100)A, 3×220V5 (400)A or 3×100V0.5(25)A electric energy meter.
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Abstract
The invention provides to a method and a system for calculating electric energy and an electric energy meter and is applied to the field of energy sources. The method comprises the following steps of: receiving an input voltagesignal and an input current signal; sampling wave forms of the voltagesignal and the current signal to obtain a sampling point set of the voltage signal and the current signal; performing direct current (DC) filtering on the sampling point set; switching ranges of the voltage signal and the current signal which are processed by DC filtering; correcting phases of the current signal after the ranges are switched; calculating electric energy power of the voltage signal and the phased-corrected current signal; and generating output pluses when the calculated electric energy power reaches an electric energy value of a single pulse, and deducting the electric energy value of the single pulse from an accumulated electric energy accumulated. The technical scheme provided by the invention has the advantages of expanding measuring ranges of electric energy.
Description
technical field [0001] The invention belongs to the field of energy, and in particular relates to an electric energy calculation method, system and electric energy meter. Background technique [0002] Electric energy metering devices (hereinafter referred to as electric energy meters) are divided into single-phase electric energy meters and multi-phase electric energy meters. Phase electricity consumption is measured by three-phase electric energy meters. The energy meter calculates electric energy by collecting AC voltage and AC energy signals. [0003] There are 58V, 100V, and 220V voltage gauges (UUn) for various electric energy meters currently on the market, and current gauge specifications are 1.5(6)A, 5(20)A, 10(60)A, 20(80 )A, 30(100)A, etc., the current specification is expressed as I b (Imax)A, where I b Called the base current, Imax is called the maximum current. The measurement range of voltage is -20%Un~+20%Un, and the accurate measurement range of current ...
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Application Information
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