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Digital single cycle method control active power filter based on delay compensation

A power filter and delay compensation technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc. Simple, low-impact, dynamic and responsive effects

Active Publication Date: 2014-09-24
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, digital control also brings delay problems, which reduces the compensation accuracy of active power filters, so it is also necessary to compensate for delays

Method used

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  • Digital single cycle method control active power filter based on delay compensation
  • Digital single cycle method control active power filter based on delay compensation
  • Digital single cycle method control active power filter based on delay compensation

Examples

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Embodiment Construction

[0025] (1) Harmonic current calculation

[0026] use as Figure 4 The circuit shown detects the load current, converts the small current signal output by the current hall through the sampling resistor RA1 into a voltage signal iain, passes the voltage signal through the RA2 and CA1 high-frequency filter circuit to filter out the high-frequency signal, and then The signal is input to the voltage booster OPA2 and the proportional amplifier circuit OPA3 through the voltage follower OPA1, and the bipolar signal is converted into a unipolar signal, and finally the limiter circuit of 0-3.3V composed of DA1 and DA2 is used to limit the signal. The signal after amplitude is input into DSP (Digital Signal Processor). The AD sampling module in the DSP (Digital Signal Processor) is used to sample the load current, and the sampling channel 0 and the sampling channel 1 are used to sample the A-phase load current and the B-phase load current respectively. use as image 3 The harmonic cur...

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Abstract

The invention provides a digital single cycle method control active power filter based on delay compensation, belonging to the field of digital control. The implementation of the filter comprises the following steps: (1) detecting load current and using a harmonic calculation method to calculate harmonic current ilha, ilhb, and ilhc, (2) detecting three-phase power supply voltage ea, eb and ec and DC side capacitance voltage Udc, and inputting the three-phase power supply voltage and the DC side voltage into a DSP(digital signal processor) for sampling, (3) inputting the above sampling value into a single cycle control module to calculate the duty ratio of a switch tube, and (4) multiplying the calculated duty ratio with the cycle register value of a timer in the DSP, taking the result as the value of a comparison register, controlling the DSP to generate a PWM signal, controlling the switch-on and switch-off of a switch in a converter, turning on a switch device when the PWM signal is high level, turning off the switch device when the PWM signal is low level, and thus generating compensation current. According to the active power filter, the delay effect of the active power filter can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of digital control. It is mainly used to control the three-phase three-wire active power filter. Background technique [0002] With the rapid development of power electronics technology, nonlinear power electronic devices have been widely used in various fields, which makes the control of electric energy more convenient and improves people's quality of life, but at the same time it also generates a large number of harmonics, which brings many hazards . Due to its unique advantages in harmonic suppression, active power filters have become a research hotspot. [0003] The working principle of the active power filter is: detect the load current through the detection circuit, use the harmonic detection algorithm to obtain the harmonic components in the load current, and finally use the current tracking control method to control the converter to generate compensation current, and the compensation current is injected into...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 李岚郑峰白慧杰李秉辉
Owner TAIYUAN UNIV OF TECH
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