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Control Strategy Research of UPFC and Influence Caused by UPFC Installed in Power System

Author: LiuYongJiang
Tutor: KangJiTao
School: Southwest Jiaotong University
Course: Proceedings of the
Keywords: Unified Power Flow Controller Power Flow Control Parallel inverter control Series inverter control Power coupler Power decoupling Linear model Small Signal Stability
CLC: TM76
Type: Master's thesis
Year: 2011
Downloads: 99
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Abstract


Flexible AC Transmission System (FACTS) technology will be beneficial to promote the development and application of modern power system technology innovation to improve economic and security stability of the system running. Power Flow Controller' dissertation">Unified Power Flow Controller (UPFC) is currently the most powerful FACTS controller, it makes the steady-state performance of power systems and dynamic performance can be significantly improved. This paper introduces the FACTS, and UPFC study and application status. This paper introduces a method of flow calculation with UPFC establish an algorithm combined with the traditional PQ trend the UPFC trend model, and the steady-state mode of UPFC type flow calculation into the target value control system electrical quantities relationship. Under steady state conditions, the study of the relationship of UPFC internal control, analysis and optimization of the control strategy instead of the direct control of an intermediate control variables in the control series side trend, its rationality is verified by simulation. UPFC controller design is divided into two steps: the first step, starting from the the UPFC shunt side system mathematical model, a of UPFC parallel side of the double-loop control system is designed, its inner ring current decoupling controller dq axis current decoupling, the outer ring DC capacitor voltage, q-axis control node voltage PI control mode, respectively, with the d-axis control, and join the current feedforward control links and current feedback control link, thus improving the system control accuracy and response speed. The simulation system uses a high voltage level, and use p.u. method to analyze and calculate the parameters of the various types of controller. The second step, in the general system of UPFC analyze the power transmission capacity, PQ calculation plotted two-dimensional plan view, drawn controllable trend range. UPFC series the side controller design using tricyclic control model, in which the current loop, voltage ring and power ring PI control parameter setting calculation, and focus on analysis of the power loop control strategy, through the analysis of small signal method and frequency characteristics draw an effective means of power control. The side of the control system of the above two steps parallel side and tandem synthesis - the body, the simulation results show that UPFC controller is effective and reasonable. In addition, the control strategy for two different trends - power coupling and power decoupling control than the simulation analysis, comparing the advantages and disadvantages of both from the point of view of stability, fast, etc.. The paper discusses the impact of UPFC in power system. UPFC control system, the establishment of a new the UPFC 11 order dynamic model, combined with the dynamic model of the generator and exciter to build a linear model of the power system with UPFC. In a multi-machine system, using eigenvalue analysis of the system with UPFC the small interfering stability in the case of steady-state operation.

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