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Input signal filtering and shaping circuit of power-angle measuring device

A measurement device and technology for inputting signals, applied in electrical components, pulse processing, pulse technology, etc., can solve problems such as signal glitches or ringing, affecting measurement accuracy, and achieve the effects of short response time, improved measurement accuracy, and easy debugging.

Inactive Publication Date: 2011-05-11
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Abstract
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Problems solved by technology

[0004] In the above invention, no corresponding hardware circuit is designed for the input key phase signal and terminal voltage signal for effective processing, resulting in defects such as burrs or ringing in the signal input to the digital sampling and signal processing module, which will affect the measurement accuracy

Method used

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  • Input signal filtering and shaping circuit of power-angle measuring device
  • Input signal filtering and shaping circuit of power-angle measuring device
  • Input signal filtering and shaping circuit of power-angle measuring device

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Embodiment

[0029]Embodiment: the present invention comprises key-phase signal processing circuit (attached figure 1 ) and terminal voltage signal processing circuit (attached figure 2 ). Among them, the key phase signal processing circuit includes: key phase signal filter circuit 1, photoelectric coupler 2, key phase signal shaping circuit 3; Device 6, terminal voltage shaping circuit 7.

[0030] 1) The key-phase filter circuit 1 includes: two operational amplifiers (U1 and U2), two diodes (D1 and D2), five resistors (R1, R2, R3, R4, R5), an inductor (L1) and A capacitor (C1). After the key-phase signal PULSE1 enters the key-phase signal filter circuit 1, it first passes through a low-pass filter circuit composed of resistors (R1 and R2) and an inductor (L1) to filter out high-frequency noise, and then uses the forward-conducting and reverse-cutting characteristics of the diode D1 Cut off the negative voltage part of the key phase signal waveform. Then the signal enters the voltage...

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Abstract

The invention provides an input signal filtering and shaping circuit of a power-angle measuring device. The invention filters a key-phase signal input and a terminal voltage signal input by use of a perfect filtering circuit, adopts a photoelectric coupler to suppress the system noise and finally generates a high-precision square-wave key phase pulse and a terminal voltage pulse through an appropriate hysteresis voltage comparator.

Description

technical field [0001] The invention relates to the field of real-time dynamic monitoring of power systems, and more particularly relates to an input signal filtering and shaping circuit of a power angle measuring device. Background technique [0002] The generator is one of the most important components of the power system, and the power angle is an important parameter of the internal energy conversion of the generator, and it is also an important indicator of the stable operation of the generator. The power angle refers to the angle between the internal potential of the generator and the terminal voltage of the generator. At present, the most optimized method of measuring the power angle is the direct measurement method. This method directly measures the spatial position of the generator rotor, and then uses the terminal voltage measurement to start The power angle of the motor. In the direct measurement method, the key-phase signal and the terminal voltage signal are ind...

Claims

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Application Information

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IPC IPC(8): H03K5/1252
Inventor 王俊永吕大伟许勇
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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