Normalizing multiprocessor electric power metering method

Abstract

The invention discloses a normalizing multiprocessor electric power metering method, which comprises the following steps of: with T seconds as a sampling period, simultaneously sampling and quantifying a voltage to be measured and a current to be measured by a master processor at regular time, to obtain voltage sampled data and current sampled data at a same moment, and calculating a direct-current power p0; and in N slave processors, setting a value of a positive integer K, setting values of N*2k frequencies to successively increase progressively and each to be a positive number no greater than 2pi / T, obtaining estimated frequencies omega11, omega12,..., omega1k, omega21,..., omegaNK using an iterative method, and calculating active powers p11, P12,..., P1K, p21,..., pNK, reactive powers q11, q12,..., q1K, q21,..., qNK, apparent powers s11, s12,..., S1K, S21,..., SNK, and power factors c11, c12,..., c1K, c21,..., cNK. As the iterative method is used to meter the electric power, the normalizing multiprocessor electric power metering method can be directly applied to a computer system and has relatively high precision and relatively fast convergence rate.

Description

technical field [0001] The invention belongs to the technical field of electric power measurement, and in particular relates to a method for measuring direct current power and active power, reactive power, apparent power and power factor of multiple alternating current components with unknown frequencies. Background technique [0002] In engineering, it is often necessary to measure the DC power of electronic and electrical equipment and circuits, as well as the active power, reactive power, apparent power and power factor of AC components with unknown frequencies. For this reason, several types of electric power have been proposed in the prior art Although the measurement method has achieved good results, there are still some shortcomings, such as: [0003] The electric power measurement method using a single processor is limited by the computing speed of the processor, the data processing time and sampling cycle are long, the number of AC components is limited, and the rea...

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Problems solved by technology

[0005] The electric power measurement method for continuous time signals based on differential equations cannot be directly applied to computer systems;

[0006] The electric power metering method using the infinite impulse response (IIR) algorithm, the running time of each iteration may not be equal, and it is difficult to determine the value of the timing sampling period

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