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High-precision voltage regulation method adapted to pulsed nonlinear load

A non-linear load, voltage regulation technology, applied in the direction of RMS measurement, etc., can solve problems such as the inability to guarantee the accuracy, affecting the parallel stability, and increasing the excitation of the voltage regulator.

Inactive Publication Date: 2017-10-24
JIANGXI QINGHUA TAIHAO SANBO ELECTRICAL MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The AVR measurement voltage cannot form a linear relationship, and the accuracy cannot be guaranteed
[0015] The harmonic content is very small and the high-order harmonic signal is filtered out after passing through the low-pass filter, resulting in the energy loss of the measurement signal. The voltage regulator will misjudge that the external voltage is low and increase the excitation, causing the output voltage of the generator to rise. Large deviation in power distribution
At the same time, the pulsed nonlinear load causes the harmonic content of the generator voltage to be strong and sometimes weak, and the voltage regulator's measurement signal is sometimes high and sometimes low, causing voltage fluctuations and affecting the stability of the parallel connection

Method used

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  • High-precision voltage regulation method adapted to pulsed nonlinear load
  • High-precision voltage regulation method adapted to pulsed nonlinear load
  • High-precision voltage regulation method adapted to pulsed nonlinear load

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Embodiment Construction

[0038] A high-precision voltage regulation method suitable for pulsed nonlinear loads, such as figure 2 and image 3 As shown, the steps are as follows:

[0039] The first step: the line voltage is sampled by the voltage transformer, the instantaneous voltage output by the U11A-1# pin of the operational amplifier is Uca, and the instantaneous voltage output by the U11B-7# pin is Uab.

[0040] The second step: the voltage sampling signal reads the effective value through the AC multiplier:

[0041]

[0042] Step 3: After the low-pass filter, the instantaneous value of the voltage is

[0043] Proportional to the square of the rms voltage,

[0044]

[0045] Under any load, the measurement signal will not lose higher harmonic components.

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Abstract

The invention provides a high-precision voltage regulation method adapted to a pulsed nonlinear load. Three-phase voltage is detected, an effective value is read through an AC multiplier, through a low-pass filter and PID control, PWM is regulated, and final high power tube output is controlled. Under any load, through the AC multiplier and the low-pass filter, a measurement signal does not lose a high-order harmonic component. Voltage detection adopts a three-phase effective value measurement mode, problems of inadequate voltage precision and instable voltage caused by large voltage waveform distortion can be solved to the maximum degree, and the method is particularly suitable for being used in a nonlinear pulsed load situation.

Description

technical field [0001] The invention relates to a high-precision voltage regulation method adaptable to pulsed non-linear loads. Background technique [0002] Non-linear pulse loads, such as electronics and energy storage components such as capacitors and inductors, have non-linear electrical volt-ampere characteristics, so that the voltage and current of the load contain a large number of high-order harmonic components, and the voltage and current waveforms are non-sinusoidal. The load appears intermittently in the form of pulses, which is equivalent to the sudden increase and decrease of the load. The pulse load has extremely high instantaneous power and high harmonic content, which has a great impact on the power quality of the power station system. At the same time, higher requirements are placed on the voltage regulator. [0003] The nonlinear pulse load voltage waveform can be expressed by the following formula: [0004] U=U 1 sin(ωt+α 1 )+U 2 sin(2ωt+α 2 )+U 3 ...

Claims

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Application Information

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IPC IPC(8): G01R19/02
CPCG01R19/02
Inventor 吴敏
Owner JIANGXI QINGHUA TAIHAO SANBO ELECTRICAL MACHINE