A Calculation Method of Phasor Angle in Power System

Abstract

The invention discloses a computing method for a phasor angle of an electric system. The computing method comprises the following steps of: designing an enquiry form according to a tangent value or a cotangent value, increasing the tangent value from 0 to 1 according to the same step length, wherein the results, which are obtained by anti-tangent computation, of step length values form an element of the enquiry form in sequence, the decimal place of the practical value of the element is designed according to precision to be computed for outputting; computing the tangent value according to the real part and the imaginary part of the phasor, computing the cotangent value and taking the absolute value of the cotangent value to obtain a computed result if the tangent value is bigger than 1; and calling the data of the enquiry form and obtaining a practical angle or radian result according to characteristics of eight zones which are obtained by dividing the angle or the corresponding radian value on a complex number plane. The computing method disclosed by the invention can be used for solving contradictions between expense computation and precision computation; when the algorithm is used in the same CPU (Central Processing Unit), the computation time is better than that of a system calling function, and the precision can satisfy the application needs according to the design of the enquiry form.

Description

technical field [0001] The invention relates to a calculation method of a phasor angle, in particular to a calculation method of a power system phasor angle. Background technique [0002] The phasor angle of the power system is an important observation quantity. The direction calculation, impedance calculation and phase sequence judgment of the power system need to measure its value in real time, and make corresponding control measures according to the change of its value. The angle calculation method commonly used in power systems uses the system functions provided by the CPU, including arccosine, arcsine, arctangent or inverse cotangent, but no matter which method is used, the calculation time depends on the computing speed of the CPU. For automation equipment, the main frequency of the CPU used in the measurement and control field is limited. For occasions with high real-time requirements, it is necessary to design a simple algorithm to solve the contradiction between cal...

AI Technical Summary

Problems solved by technology

The angle calculation method commonly used in power systems uses the system functions provided by the CPU, including arccosine, arcsine, arctangent or inverse cotangent, but no matter which method is used, the calculation time depends on the computing speed of the CPU. For automation equipment, the main frequency of the CPU used in the measurement and control field is limited. For occasions with high real-time requirements, it is necessary to design a simple algorithm to solve the contradiction between calculation cost and calculation accuracy, so that it can be easily used in Realized on the power system measurement and control device, and can meet the engineering error requirements

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