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
CN1893215AActive Publication Date: 2007-01-10THE HONG KONG POLYTECHNIC UNIV
0 Cites 11 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
THE HONG KONG POLYTECHNIC UNIV
Publication Date
2007-01-10

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More