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Direct current voltage on-line identification method for active filter

A source filter, DC voltage technology, applied in instruments, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of increasing circuit cost and complexity, and achieve good dynamic and steady state tracking features, reduced cost and complexity of the hardware

Inactive Publication Date: 2011-04-06
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, measuring DC voltage with a voltage sensor adds cost and complexity to the circuit

Method used

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  • Direct current voltage on-line identification method for active filter
  • Direct current voltage on-line identification method for active filter
  • Direct current voltage on-line identification method for active filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The active filter consists of a control device and an inverter device.

[0045] The control device is composed of three parts: synchronous circuit, detection circuit and control drive circuit. The functions of each part are as follows:

[0046] a. Detection circuit: realize the detection of grid voltage and grid current to obtain a voltage signal of 0-3V, provide a feedback signal for current closed-loop control, and use it as an input for online identification of DC voltage;

[0047] b. Synchronous circuit: use the voltage transformer and the limiting circuit to obtain the reference signal with the same frequency and phase as the grid voltage;

[0048] c. Control drive circuit: with the DSP chip as the core, the analog-to-digital conversion unit in the DSP chip is used to collect the signals from the synchronous circuit and the detection circuit, and the control signal is obtained through program calculation and judgment, and the control signal is used to control the i...

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PUM

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Abstract

The invention discloses a direct current voltage on-line identification method for an active filter. In the method, a reference model for direct-current voltage identification and a single nerve cell with adjustable parameters are set up according to a switch mean model of an inverter, the direct-current voltage is taken as the weighting coefficient of the single nerve cell, and the weighting coefficient is constantly regulated through a learning algorithm so as to realize the tracking of an actual value by an identification value, therefore, a circuit for detecting the direct-current voltage is saved, and the complexity of the whole filtering control circuit is reduced. The direct current voltage on-line identification method for the active filter can effectively reduce the cost of the active filter and the complexity of the hardware, with an accurate identification result.

Description

technical field [0001] The invention belongs to the field of active power filters, and relates to an online DC voltage identification method in an active filter, in particular to a method for establishing a DC voltage identification reference model based on an inverter switch average model and using a single neuron Weight learning and adjustment to realize the method of identification value tracking actual value. technical background [0002] With the development of power electronics technology and its wide application in industry, the pollution of power grid is becoming more and more serious. Traditional passive filters are gradually being replaced by active power filters due to the disadvantages of only filtering specific sub-harmonics and easily resonating with the power grid. [0003] The basic principle of the active power filter is to generate a harmonic current (voltage) that is opposite in direction to the load harmonic current (voltage) and equal in magnitude to el...

Claims

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Application Information

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IPC IPC(8): H02J3/01G05B13/04
CPCY02E40/40
Inventor 唐欣曾启明陈伟乐姚成诚
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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