Single-phase active electric-power filter using analog cascade connection controller

A source filter and controller technology, used in active power filtering, energy industry, harmonic reduction devices, etc., can solve the problems of high cost and small number of installations, reduce production costs, suppress harmonics, and solve problems. Effects of Power Quality Issues

Active Publication Date: 2007-01-10
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, only three-phase commercial active power filter products are available, and they are very expensive, so there are not many installations

Method used

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  • Single-phase active electric-power filter using analog cascade connection controller
  • Single-phase active electric-power filter using analog cascade connection controller
  • Single-phase active electric-power filter using analog cascade connection controller

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Embodiment Construction

[0037] In order to more effectively solve the problem of power harmonics, it is better to install multiple active filters with smaller ratings. At the same time, in order to facilitate low-cost analog control, it is recommended to use the cascade control of the PFC parallel active power filter in the present invention.

[0038] 1 Overview

[0039] It is easy to design a simple proportional integral controller based on the state average model of the shunt active power filter. The whole design includes: two control loops outside the inner current loop of the voltage loop. As long as the internal current loop is much faster than the external voltage loop, cascade control can be implemented. In order to obtain high power factor and low current THD, the bandwidth of the current loop must be fast enough to generate compensation current. At the same time, the current loop must have sufficient capacity to reduce the influence of the power supply voltage and the regulated DC busbar voltage...

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PUM

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Abstract

The single-phase active electric power filter of using analog cascaded controller includes control circuit, and connected main circuit. The control circuit includes first and second proportional plus integral controllers, multiplier, subtracter, feedforward controller, and adder. Principle of the invention is as following: using voltage loop composed of these analog parts adjusts DC voltage of bus in two control loops including external current loop as well as generates current of reference power supply; using current loop reduces interference effect, and tracks current of reference filter; finally, generating command signal for main circuit to generate compensating current. Using analog devices in low cost without need of microprocessor, the invention realizes active electric power filter capable of restraining harmonic, and correcting power factor. The invention reduces cost of the filter, and has no mathematic burden for calculating fundamental wave and harmonic of load current.

Description

Technical field [0001] The present invention relates to active filter technology, in particular to a single-phase active power filter using an analog cascade controller. Background technique [0002] Today, the use of electrical energy has expanded from simple linear loads to electronic power equipment with non-linear, impact and imbalance characteristics, such as solid-state motor drives, personal computers, and energy-saving ballasts Device. In these devices with distorted input current characteristics, rectifiers are often used. In addition, typical switching power supplies use diode rectifiers for AC-DC conversion. These diodes take short pulse input current from the power supply system, rather than smooth sine wave input current. Then, in order to deliver the same amount of power with short pulses, the current peak value will be very high. This puts pressure on wiring, circuit breakers and even power distribution devices provided by utility companies. At the same time, becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20Y02P80/10
Inventor 曾启明陈伟乐
Owner THE HONG KONG POLYTECHNIC UNIV
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