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A Calculation Method of Voltage Angle Applied to Power Distribution Terminal

A power distribution terminal and calculation method technology, applied to the phase angle between voltage and current, measurement of electrical variables, measurement devices, etc., can solve the problems of angle calculation errors, high CPU resource consumption, etc., to increase computing load, simplify calculated effect

Inactive Publication Date: 2015-09-30
ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fourier calculation requires a complete voltage signal sample, but the voltage signal is a changing process, so when the voltage signal changes periodically, if the sample data is incomplete, the calculation of the real part and the imaginary part will have errors, resulting in errors in the calculation of the included angle , and the calculation of arctangent involves floating-point operations, which consumes a lot of CPU resources

Method used

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  • A Calculation Method of Voltage Angle Applied to Power Distribution Terminal
  • A Calculation Method of Voltage Angle Applied to Power Distribution Terminal

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Embodiment Construction

[0017] When the power distribution terminal judges whether it is a synchronous voltage, it needs to calculate the angle between the two voltages. The present invention provides a method for obtaining the included angle.

[0018] refer to figure 1 As shown in the flow chart, the first step is to collect voltage. There is a collection circuit inside the power distribution terminal, which can collect voltage. Of course, the signal on the circuit that the collection circuit can collect is not limited to voltage, current, resistance, etc. can also be used. The acquisition circuit of the present invention includes a voltage transformer PT and an AD converter, and the voltage transformer PT is electrically connected to the AD converter. When a voltage signal passes through the PT, the PT converts the signal into a differential signal whose Vp-p does not exceed 4V, where Vp-p is the peak value of the converted voltage, and the AD converter receives the differential signal and convert...

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Abstract

The invention discloses a computing method applied to a voltage included angle of a power distribution terminal. Voltages are acquired through an acquisition circuit in the power distribution terminal, relevant processing is performed on the voltages subjected to acquisition processing through an arithmetic device in the power distribution terminal to obtain a corresponding operation result, an arc cosine table which is made according to the operation result in advance is stored in a storage of the power distribution terminal, and the voltage included angle corresponding to the operation result is found through automatic retrieval. According to actual measurement, the computing method can work out the required voltage included angle accurately to meet actual application under the premise of enough sample data, the operation is not affected by signal frequency changes, the floating point operation is avoided, and the operation efficiency is improved.

Description

technical field [0001] The invention relates to circuit data processing, in particular to a method for calculating voltage angles applied to power distribution terminals. Background technique [0002] The distribution terminal is an important part of the DA (distribution automation) system and is located at the base layer. The real-time data of the DA system, the criterion for automatic fault processing, and the operating conditions of the switchgear are all derived from the power distribution terminal. Operations are performed through power distribution terminals, and the reliability and real-time performance of power distribution terminals directly affect the reliability and real-time performance of the entire DA system. [0003] When measuring the voltage simultaneously, it is necessary to calculate the angle between the two voltages. For the calculation of the included angle of the power distribution terminal, the Fourier transform method is generally used to calculate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
Inventor 秦卫东詹植振丁子良
Owner ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO
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