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Research of Low-Voltage Four-leg STATCOM

Author: HuangXiaoMei
Tutor: LiWei
School: Shandong Institute of Architecture
Course: Control Theory and Control Engineering
Keywords: Reactive power compensation Harmonic filter Static Synchronous Compensator Quasi Controllability Overall design The simulation
CLC: TM761
Type: Master's thesis
Year: 2010
Downloads: 55
Quote: 0
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Abstract


Static synchronous compensator in power system is increasingly widespread, played the role of the power factor to improve power system, the elimination of high-order harmonic, and significantly improve the quality of power supply grid, reduce line loss of feeder lines. Static synchronous compensator is mainly used in the occasions of the high-pressure high-capacity, low voltage small capacity power supply and distribution system is also unusual in civil construction. In this paper, there are a lot of transformation and distribution in the civil construction developed a system voltage of 380/220V, capacity 100kvar following static synchronous compensator. Contains a large number of lighting load and electric load due to the low voltage power supply system in the civil construction, single-phase power, the system usually are three-phase unbalanced static synchronous compensator must have normal in the imbalance of power supply system ability to work, and in addition to the reactive compensation unbalanced low-voltage distribution network to filter out high-order harmonic balanced three-phase current, should also play a role. The proposed static synchronous compensator can be used in civil construction supply system three-phase unbalanced reactive load compensation, with the elimination of part of the low-level high-order harmonic function, eliminating the power side of the zero-sequence current. The main conclusions of this article are as follows: the selection of the four-leg inverter main circuit, as this static synchronous compensator and the establishment of a mathematical model of the four-leg static synchronous compensator, this model can control analysis, on the basis of its state is not completely controllable the quasi static synchronous compensator Controllability. Quasi Controllability proposed provides a theoretical basis for the calculation of the error current range of static synchronous compensator and select important significance. The overall design of static synchronous compensator: selected current detection method based on generalized instantaneous reactive power theory error detection method in the case of the voltage waveform distortion remains good measurement accuracy to generate a given current instructions; The the error current control selection of double-loop control method, this method is based on the nonsingular coordinate transformation, the three-phase current and three-phase voltage transformation to αβ0 Cartesian coordinate system, is given in a more explicit manner the reactive current, active current, as well as the zero line current, and then the inverse transform, to determine each phase of the compensation current and the zero line of the compensation current of a given value; important components of the system are calculated, the parameters of the calculation process and the calculation results are listed the results of these calculations to process reaches to expand the depth of the preliminary design. Especially late in the course of the study, made a simulation test system in MATLAB. The simulation results of the static synchronous compensator has better compensate for unbalanced system reactive power performance, the dynamic response is satisfactory, and can effectively filter out low-level system high harmonic currents and zero sequence current . As distinguishing characteristics of other compensation, three-phase load has a significant imbalance, adding compensator, power side shows the good equilibrium, zero-sequence current basic is eliminated. \Low voltage static synchronous compensator is expected to have a good prospect.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts
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