Three bridge arm uniform power quality regulator

A power quality and regulator technology, which is applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of increasing device power loss, large switching loss, device efficiency reduction, etc., and meet the requirements of harmonic compensation. Effects of improving operational reliability and improving utilization efficiency

Inactive Publication Date: 2005-03-02
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0005] (1) The high-order harmonics generated by the inverter bring difficulties to the design of the transformer, which increases the capacity of the transformer
[0006] (2) The transformer increases the power loss of the device; reduces the efficiency of the device and increases the cost
[0007] (3) For the series isolation transformer, the interaction with the filtered inductance and capacitance will bring additional phase shift and voltage drop, which will affect the performance of the device for voltage compensation
[0008] (4) The access of the series transformer reduces the voltage accuracy under open-loop control
[0010] The traditional UPQC adopts a four-bridge arm structure, with a total of 8 switching tubes, and the switching loss is relatively large. Especially in the case of small load capacity, the large switching loss reduces the efficiency of the device, which is very uneconomical.

Method used

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  • Three bridge arm uniform power quality regulator
  • Three bridge arm uniform power quality regulator
  • Three bridge arm uniform power quality regulator

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Embodiment Construction

[0035] The present invention proposes a three-arm unified power quality regulator that does not require electrical isolation, and its circuit diagram is as follows figure 2 As shown, including a first inverter bridge composed of 4 and 6 and an inductor L 1 5 is a DC energy storage unit for storing the electric energy of the above-mentioned DC form, and the DC energy storage capacitor is connected in parallel on the DC side of the voltage compensator and the current compensator; a second inverter bridge composed of 7 and 6 and A capacitor C 0 with inductance L 2 The formed filter; 5 is a common bridge arm used to provide a current loop for the parallel unit and the series unit, and forms the first inverter bridge and the second inverter bridge with 4 and 7 respectively.

[0036] The working principle of the unified power quality conditioner of the present invention is introduced in detail below:

[0037] Mathematical model of the regulator:

[0038] Since the series and pa...

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Abstract

This invention three arm electric quality regulator comprises: 1) current compensator for power system, involving parallel unit arm and a shared arm to form first inverting arm and an electric filter composed by inductance set; 2) a dc current storage capacitor; 3) voltage compensator for power system; involving a series unit arm and a shared arm to form second inverting arm and an electric filter conmposed by capacitor and inductance set; 4) shared arm for supplying current return circuit for parallel arm and series arm with which forming first inverting arm and second inverting arm respectively. Use of this invention electric isolation is not needed. One arm is saved than prior art four arms regulator, so, lowering prodn. cost.

Description

technical field [0001] The invention relates to a three-arm unified power quality regulator, in particular to a three-bridge unified power quality regulator without electrical isolation, and belongs to the technical field of electric power equipment. Background technique [0002] The power quality conditioner is a device in the power system that eliminates the pollution of the power quality in the system by compensating the distortion components of the voltage and current in the system. According to its working object, it can be divided into two types: voltage-type power quality regulator and current-type power quality regulator. [0003] Unified power quality conditioner (hereinafter referred to as UPQC) is a distribution network flexible AC transmission (DFACTS) technology, which combines the functions of voltage-type power quality conditioner and current-type power quality conditioner, and can ensure the The voltage quality of the system side and the current quality of t...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02J3/00H02J3/01H02J3/12H02J3/28
CPCY02E40/40
Inventor黄玮姜齐荣沈菲
OwnerTSINGHUA UNIV