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Current transformer DC side voltage closed loop control method of active power filter and system

A power filter, DC side voltage technology, applied in active power filtering, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem when real-time harmonic compensation cannot be achieved and current changes are obvious. hysteresis, inability to respond to rapid changes in harmonic currents, etc.

Inactive Publication Date: 2003-04-16
TSINGHUA UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] using the traditional i p i q In the harmonic detection method, the digital controller will generate a delay time, but the method itself does not compensate the delay time, there is an obvious time lag for the current change, and it cannot respond to the rapid change of the harmonic current, so that the real-time compensation of the harmonic cannot be realized
Although the DC-side capacitance control relying on harmonic current detection can achieve control results, since the real-time detection of harmonic current is an important link to ensure the compensation characteristics of active power filters, the DC-side capacitance control also needs to be changed accordingly.

Method used

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  • Current transformer DC side voltage closed loop control method of active power filter and system
  • Current transformer DC side voltage closed loop control method of active power filter and system
  • Current transformer DC side voltage closed loop control method of active power filter and system

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Embodiment Construction

[0061] In terms of hardware circuit implementation, the digital signal processor TMS320F240PQA of Texas Instruments is used as the CPU of the command current calculation circuit to perform the calculation of the compensation current command signal. The IPM module uses Toshiba's MIG150Q6C. The system schematic diagram is as follows Figure 4 shown. The programming adopts the special assembly language instruction of TMS320F240PQA.

[0062] The main program flow chart of the software is as follows: Figure 5 shown. It is divided into seven sub-modules according to the functional structure. Compensation angle Δθ module, CONSR module, SBCONSR module, LPF module, REVSR module, DC side voltage control module, WAVE module.

[0063] Compensation angle Δθ module

[0064] This module is to compensate the time delay caused by the calculation of the digital controller. The flowchart is shown in Figure 7.

[0065] Entry: delay time ΔT

[0066] Export: angle θ that has been added to t...

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Abstract

Current transformer DC side voltage closed-loop control method of active power filter characterizes in a selective harmonic detect method, which will get two-phase coordinate system current after detecting the N time of harmonic active or reactive DC component and through delay compensated angle variable matrix, and to deduct DC side voltage adjust signal to make the compensate current signal contain a certain basic wave active current component, in which, adjust signal is the difference between the given value of the current transformer DC side capacitance voltage and feed back value of the side capacitance voltage adjusted by an adjuster.

Description

technical field [0001] A converter DC side voltage closed-loop method and system of an active power filter belong to the technical field of active power filters. Background technique [0002] With the development of power electronic technology, power electronic devices are widely used, and the harmonic pollution of power grid caused by them is becoming more and more serious. Active power filter, as a device for effectively compensating power grid harmonics, has attracted people's attention. [0003] The active power filter system consists of two parts, such as figure 1 As shown, that is, the command current operation circuit and the compensation current generation circuit (the compensation current generation circuit is composed of three parts: the current tracking control circuit, the driving circuit and the main circuit). [0004] Depend on figure 1 It can be seen that the compensation current generating circuit is an important part of the parallel active power filter. ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 王灏杨耕徐文立
Owner TSINGHUA UNIV
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