Uniform power quality controller

A power quality and controller technology, applied in the direction of AC network voltage adjustment, AC network load balancing, etc., can solve the problem of expensive energy storage devices and achieve the effect of reducing costs

Active Publication Date: 2014-07-02
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above problems, the present invention proposes a unified power quality controller, which can effectively solve the problem of expensive energy storage devices

Method used

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Embodiment 1

[0021] Such as figure 2 As shown, it is a schematic structural diagram of the unified power quality controller of the present invention in Embodiment 1, including a series unit 11, a parallel unit and an energy harvesting unit; the series unit 11 is composed of a series converter 111 and three single-phase transformers The three-phase transformer T1, the parallel unit includes a parallel converter 121, and the energy harvesting unit includes a parallel converter 131; the AC side of the series unit and the parallel unit are connected through a three-phase feeder.

[0022] Wherein, the three single-phase output ends of the AC side of the series converter 111 in the series unit are respectively connected to the output ends of the three single-phase transformers (T a , T b , T c ), the input terminals of the three single-phase transformers T1 are respectively connected to the three-phase feeder (U a1 , U b1 , U c1 ) on each feeder; the three single-phase output terminals on ...

Embodiment 2

[0030] In this embodiment, the series converter 111, the parallel converter 121 and the parallel converter 131 are all modular multilevel converters (Modular Multilevel Converter, MMC), correspondingly, the unified electric energy provided by the present invention The quality controller can also be called MMC-UPQC.

[0031] Such as Figure 4 As shown, it is a schematic structural diagram of the modular multilevel converter MMC in this embodiment. The modular multilevel converter is a three-phase full-bridge voltage source inverter structure, and each phase of the AC side (A, B, C) all include two bridge arms, the upper bridge arm and the lower bridge arm (such as the bridge arm 20 and the bridge arm 21 in the figure), and each of the bridge arms 20 includes a bridge arm reactor 201 and N submodules (such as submodule 201 and submodule 202 in the figure), the two bridge arm reactors 201 in the two bridge arms 20 of each phase are connected in series, and the two bridge arm react...

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Abstract

The invention discloses a uniform power quality controller. The uniform power quality controller comprises a series connection unit, a parallel connection unit and an energy taking unit. The series connection unit comprises a series connection converter and three single-phase transformers, the parallel connection unit comprises a parallel connection converter, the energy taking unit comprises a parallel connection converter, and the series connection unit is connected with the alternating current side of the parallel connection unit through a three-phase feeder line. According to the uniform power quality controller, the energy taking unit is added, under the condition of normal voltage, a power supply connected with the three-phase feeder line maintains public direct current bus voltage through the parallel connection unit. When voltage slag happens, a power supply connected with the energy taking unit is in a connected state, the public direct current bus voltage is maintained through the energy taking unit, and the voltage slag is continuously compensated, so that the power quality of load voltage is not influenced, the uniform power quality controller does not need to be provided with an additional large capacity energy storage device, and device cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a unified power quality controller. Background technique [0002] Unified Power Quality Conditioner (UPQC) is a comprehensive solution to load power quality problems (such as voltage fluctuation and flicker, voltage harmonics, voltage dips, current harmonics, current three-phase unbalance, etc.) The power electronic device, UPQC, consists of a series converter and a parallel converter, which are connected together through a common DC bus to realize energy exchange. [0003] When a large-capacity device starts up or a short-circuit fault occurs in the power grid, it will cause a corresponding voltage sag. The voltage sag refers to the reduction of the effective value of the voltage to 0.9p.u~0.1p.u under power frequency conditions, and the duration is 0.5 cycles to 1min. . The voltage sag is very harmful to power quality sensitive equipment, which has attracted the att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28H02J3/12
Inventor 刘正富马明卫才猛徐柏榆盛超陈晓科王玲李玎罗运松王浩王晓毛梅成林邓志李兰芳
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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