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Three-phase unified electric energy quality controller without isolation link

A power quality and controller technology, applied in reactive power compensation, AC network voltage adjustment, AC network to reduce harmonics/ripples, etc., can solve problems such as increasing control complexity, so as to save isolation links and avoid disadvantages Factors, Effects of Low Cost

Inactive Publication Date: 2006-10-18
TSINGHUA UNIV
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Problems solved by technology

[0004] In April 2004, Tsinghua University's "A Unified Power Quality Conditioner Using DC Energy Storage for Electrical Isolation", which was applied to my country's State Intellectual Property Office and published in January 2005 (publication number CN 1571235A), proposed in The method of isolating the DC unit, although the transformer is omitted in this method, but four switching tubes are used on each phase of the DC bus, and the complexity of the control is increased

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  • Three-phase unified electric energy quality controller without isolation link
  • Three-phase unified electric energy quality controller without isolation link
  • Three-phase unified electric energy quality controller without isolation link

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Embodiment Construction

[0019] The novel three-phase unified power quality controller proposed by the present invention is composed of three identical single-phase controllers, and each phase controller includes:

[0020] (1) A current compensator for solving current quality problems, or called a parallel unit, including an inverter bridge composed of two IGBTs and a filter inductor;

[0021] (2) A voltage compensator, or series unit, for solving voltage quality problems, including an inverter consisting of two IGBTs and a low-pass filter consisting of capacitors and inductors;

[0022] (3) An energy storage unit that provides a stable DC voltage for two units connected in series and parallel. It is composed of two DC capacitors. public connection points.

[0023] The series units of each phase are connected in series with the load, the parallel units of each phase are connected in a triangular structure on the load side, and the energy storage units of each phase are independent of each other.

[...

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Abstract

A controller providing identical electric energy quality for three phase without isolation is composed of three identical single- phase controller as each controller being formed by parallel unit including a contravariant bridge prepared by two switching tubes and a filtering inductance, series unit including contravariant bridge prepared by two switching tubes and a filter prepared by capacity and inductance, energy storing unit including two sets of DC capacities. It features that lead wire between two sets of DC capacities is used as common connection wire of series and parallel two units to electric network.

Description

technical field [0001] The invention relates to a three-phase unified power quality controller without an isolation link, which belongs to the technical field of power equipment. Background technique [0002] Power quality problems can be divided into two categories: voltage quality problems, which refer to the reliability of power supply and the amplitude, waveform, and frequency of power supply voltage, etc., which are concerned by power loads; The size of reactive power, harmonics and negative sequence components is the focus of the power system. These two types of problems can be solved using corresponding power electronic devices, such as dynamic voltage compensators can solve voltage quality problems, and active power filters can solve current quality problems. [0003] The unified power quality controller (UPQC) combines the functions of the dynamic voltage compensator and the active power filter, and can guarantee the voltage quality of the load side and the current...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/16
CPCY02E40/30Y02E40/40
Inventor 李国杰张谢平
Owner TSINGHUA UNIV
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