Low frequency oscillations are the major problem in power system. To magnify the power system stability, new FACTS device is introduced i.e. distributed power flow controller (DPFC) for damping the low frequency elect...
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ISBN:
(纸本)9781509034116
Low frequency oscillations are the major problem in power system. To magnify the power system stability, new FACTS device is introduced i.e. distributed power flow controller (DPFC) for damping the low frequency electromechanical oscillations. DPFC works on the theory of D-FACTS (distributed FACTS). It is modified form of Unified powerflowcontroller (UPFC) with removal of common DC link in UPFC. In this paper, optimal design problem is solved using Genetic Algorithm (GA) and Differential Evolution (DE) algorithm to optimize the damping controller parameters. Results shows that DPFC employed with DE algorithm improves the stability more effectively compared with GA.
The increased power demand has led to lengthier, interconnections of power systems. Erection of new transmission lines is avoided due to environmental and economic reasons, hence increased power transfer in the existi...
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ISBN:
(纸本)9781509046973
The increased power demand has led to lengthier, interconnections of power systems. Erection of new transmission lines is avoided due to environmental and economic reasons, hence increased power transfer in the existing system. To monitor and control of power system, continuous performance analysis is required;also FACTS devices helps in improving system performance. In this work, various performance analysis of SMIB and IEEE five bus systems by conventional methods are done using Mi-power software, Simulink and PSAT tool of MATLAB software;and compared the results. A case study of the simulation is carried out with IEEE standard 5-bus system. The outcome of this work helps to enhance the security and reliability of the power system.
The DPFC is derived from the unified power-flowcontroller (UPFC). The DPFC can be considered as a UPFC with an eliminated common dc link. The active power exchange between the shunt and series converters which is thr...
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ISBN:
(纸本)9781467399395
The DPFC is derived from the unified power-flowcontroller (UPFC). The DPFC can be considered as a UPFC with an eliminated common dc link. The active power exchange between the shunt and series converters which is through the common dc link in the UPFC is now through the transmission lines at the third-harmonic frequency. The DPFC employs the distributed concept, in which the common dc-link between the shunt and series converters are eliminated and three-phase series converter is divided to several single-phase series distributed converters through the line. According to the growth of electricity demand and the increased number of non-linear loads in power grids harmonics, voltage sag and swell are the major power quality problems. DPFC is used to mitigate the voltage deviation and improve power quality. Simulations are carried out in MATLAB/Simulink environment. The presented simulation results validate the DPFC ability to improve the power quality.
The distributed power flow controller (DPFC) is a new device within the FACTS family. It is emerged from the UPFC and has relatively low cost and a high reliability. The DPFC consists of two types of converters that a...
详细信息
ISBN:
(纸本)9781424483570
The distributed power flow controller (DPFC) is a new device within the FACTS family. It is emerged from the UPFC and has relatively low cost and a high reliability. The DPFC consists of two types of converters that are in shunt and series connected to grids. The common dc link between the shunt and the series converters is eliminated. The active power exchange between the shunt and series converters that is through the common dc link in the UPFC, is now though the transmission line at the 3rd harmonic frequency. The redundancy of the series converters provides the high reliability of the system. In this paper, the DPFC behavior during the failure of a single series converter unit is considered. A control scheme to improve the DPFC performance during the failure is proposed. The principle of the control is based on the facts that, the failure of single series converter will lead to unsymmetrical current at the fundamental frequency. By controlling the negative and zero sequence current to zero, the failure of the series converter is compensated. In this paper, the principle of the DPFC are firstly introduced, and followed by the behavior of the DPFC during the failure of a single series converter. The design of the control scheme and corresponding simulation are presented.
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