A limiting method of apf

A technology of amplitude limiting and modulating wave, applied in amplitude modulation, AC network to reduce harmonics/ripple, electrical components, etc. It can solve the problems of large lag, inability to compensate harmonics, output current distortion, etc., to eliminate the transition process , the effect of improving dynamic effects and speeding up reaction time

Active Publication Date: 2021-04-13
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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Problems solved by technology

[0009] (1) The truncation method will produce the effect of clipping. The sine wave sent out will be clipped, and a distorted sine wave will be sent out. Because the output current is distorted, the APF cannot compensate the harmonics, and will also generate harmonics.
[0010] (2) The direct proportional method calculates the effective value, the lag is large, and the dynamic effect is poor

Method used

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Embodiment Construction

[0039] The present invention uses a PI controller to limit the APF output.

[0040] APF is a power electronic device that compensates and eliminates current harmonics in the grid system. The capacity of APF is determined according to the current dimension, such as 50A AFP, 150A APF, etc. When the harmonic generated by the load is greater than the capacity of the APF, it must be limited to limit the compensation current within the capacity of the APF.

[0041] The APF detects the harmonics of the load, and uses the harmonic compensation algorithm to calculate the modulation wave signal similar to the three-phase AC voltage. This modulation wave signal is sent to the PWM module of the DSP to generate waves, and drives the three-phase six-way IGBT to output the three-phase voltage wave. The modulation wave is also a three-phase voltage. The output capability of the APF, that is, the peak value of the modulation wave, cannot exceed 1. When it exceeds 1, it will output undesired h...

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Abstract

A limiting method of APF, comprising the steps of: (1) limiting the modulating wave; (2) detecting the peak value of the three-phase sinusoidal signal of the modulating wave; (3) designing a PI controller, and utilizing the PI controller to calculate the limiting coefficient; (4) The product of the modulating wave and the limiting coefficient is used as the modulating wave after limiting to drive the power electronic device, so that the APF outputs the current compensation waveform. The invention provides an APF amplitude limiting method, which directly scales the modulation, does not generate top clipping, and outputs pure sine waves; speeds up the response time, and improves the dynamic effect.

Description

technical field [0001] The invention relates to an APF limiting method, which belongs to the field of power filtering. Background technique [0002] Traditional APF limiting methods include the truncation method and the direct proportional method. The two methods are introduced as follows: [0003] (1) Truncation method [0004] The output current is limited by limiting the reference current, the principle is as figure 1 Shown: [0005] This method is simple, and it is controlled at the front end, and the response is relatively fast. The disadvantage is that new harmonics will be generated, and the current constraint Irefa+Irefb+Irefc≠0 is not considered. [0006] (2) Direct proportional method [0007] The direct proportional limit refers to the reference current value I of each phase calculated by the parallel APF according to the load current. ref Uniformly multiplied by the proportional limiting coefficient k, and according to the modified reference current I ref ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H03C1/00
CPCH02J3/01H03C1/00Y02E40/20
Inventor 何超王潞钢姜涛
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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