Unified Power Quality Controller and Method Using Resonant Electronic Switch
An electronic switch and power quality technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems that DVR devices cannot form a compensation circuit, increase the slope of line current, and cannot meet rapid identification, and achieve rapid suppression of fault current. , avoid production process interruption, avoid the effect of large-area voltage drop
Inactive Publication Date: 2016-05-25
TSINGHUA UNIV +1
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Problems solved by technology
Among them, the defect of the series DVR device is that it is only suitable for the voltage drop caused by a short-circuit fault on the system side. For the short-term power supply interruption caused by the tripping of the near-end circuit breaker or the tripping and switching of the upper-level circuit breaker, None of the DVR devices can form an effective compensation loop
The instantaneous value of the line current cannot change suddenly, and the method of simply using the instantaneous value identification may not meet the requirements of rapid identification, so the identification of the slope of the line current is added
Method used
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[0058] A unified power quality controller using a resonant electronic switch proposed by the present invention and its operation control method are described in detail in conjunction with the accompanying drawings and embodiments as follows:
[0059] A power quality control device UPQC-RES using a resonant electronic switch proposed by the present invention is characterized in that it includes a voltage source converter 1, an energy storage unit 2, a resonant electronic switch 3 and a main controller and various The main control system 4 composed of sensors, such as figure 1 shown. Among them, the resonant electronic switch is connected in series between the power grid and the protected nonlinear sensitive load, and the two ports of the resonant electronic switch are respectively PCC 1 Point and PCC 2 point; the AC output port of voltage source converter 1 is connected to PCC in parallel 2 point, the capacitor ports on the DC side are respectively connected to the correspon...
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The invention relates to a unified power quality control device employing a resonant electronic switch, and belongs to the technical field of power electronics and flexible alternating current transmission and distribution. The device comprises the resonant electronic switch, a voltage source converter, an energy storage unit and a master control system, wherein the master control system consists of a master controller and a plurality of sensors; the resonant electronic switch comprises a group of inductors Lr1 and Lr2, a group of capacitors Cr1 and Cr2 and a group of bidirectional thyristors T1; a branch formed by connecting the bidirectional thyristors T1 in series with the inductor Lr2 and the capacitor Cr1 is connected in parallel with the inductor Lr1; and a parallel branch formed by Lr1, Lr2, Cr1 and T1 is connected in series with the capacitor Cr2. A method comprises the steps of judging various power quality faults and controlling the device to quickly switch and operate among four modes. The device has the advantages of simple structure, low cost, high overload resistance and high operation efficiency.
Description
technical field [0001] The invention belongs to the technical field of power electronics and flexible AC power transmission and distribution. In particular, it relates to a power quality control device for power distribution and utilization systems, especially to a power electronic circuit device with a resonant electronic switch and an energy storage unit and an operating method for the power electronic circuit. Background technique [0002] The factors affecting the status of power quality are very complex, and are generally referred to as power quality disturbances or power quality problems. According to the length of the disturbance duration, it can be divided into two categories: those lasting no more than several seconds are usually classified as discrete disturbances, such as voltage dips, voltage swells, voltage oscillations, and transient overvoltages; Time is a continuous disturbance, such as three-phase voltage unbalance, voltage flicker, voltage harmonics and cu...
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IPC IPC(8): H02J3/00
Inventor 姜齐荣魏应冬田钰笙
Owner TSINGHUA UNIV