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Active filter harmonic current test delay time compensation method and system

A delay time and harmonic current technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of low operation efficiency, difficult to popularize and use, and high price of active power filters. To overcome the delay, the effect is good

Inactive Publication Date: 2003-03-12
TSINGHUA UNIV
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Problems solved by technology

In order to solve this problem, a device with a fast calculation speed has to be used to minimize the time used for detecting harmonic currents, resulting in extremely high prices for active power filters, and it is difficult to promote and use them in China.
[0006] In addition, the use of active power filters alone has disadvantages such as large initial investment and low operating efficiency.

Method used

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  • Active filter harmonic current test delay time compensation method and system
  • Active filter harmonic current test delay time compensation method and system
  • Active filter harmonic current test delay time compensation method and system

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Embodiment Construction

[0032] figure 2 It is a flowchart of the method proposed by the present invention when n=5, as mentioned above.

[0033] image 3 It is a functional block diagram of the system designed to realize the method in the present invention. Among them, DSP digital signal processor adopts TMS320F240PQA, regards it as the CPU of compensating electric current order signal operation. The IPM module adopts MIG150Q6C, and the programming adopts the special assembly language instruction of TMS320F240PQA.

[0034] The program flow diagram of the method proposed by the present invention is as Figure 4 shown. It is completed by the following five known submodules:

[0035] Compensation angle Δθ module: the purpose is to compensate the time delay caused by the calculation of the digital controller, the input is the delay time ΔT, and the output is the θ angle that has been added with the delay time compensation angle Δθ=nωΔT, which can be expressed as: θ=nωt +Δθ=nωt+nωΔT=nω(t+ΔT).

[0...

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Abstract

The invention belongs to the technical area of compensating the delayed time in the harmonic current detection. It is characterized by that it improves the conventional instant space vector method based on the theory of instant reactive power. When the coordinate transformation is carried out, the "delta" "theta" angle is added to the conversion matrix in order to compensate the delayed time, "delta" "theta"=n "omega" "delta" T here n is harmonic degree, "omega" is the angular frequency of the principal wave, "dlta" T is the delay time. Thus, the issue of the delayed time of the digital controller is solved. The invention realizes the real-time compensating the harmonic current, guarantees the compensation characteristic of the active filter as well as avoids the need of the device with high calculating speed so as to reduce the cost.

Description

technical field [0001] A compensation method and system for delay time of active filter harmonic current detection belong to the technical field of active filter harmonic current compensation. 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 basic principle of the active power filter is to detect the harmonic current from the load current as the compensation object, and the compensation device generates a compensation current equal to the harmonic current and opposite in polarity, so that the grid current only contains the fundamental wave component. The principle is as follows: When the system needs to compensate the harmonic current generated by the load, the active power filter...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 张超杨耕杜继宏
Owner TSINGHUA UNIV
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