Abstract
This paper proposes a new FACTS device, i.e., Unified Power Flow Controller (UPFC) to relieve power congestion on power grid network. A simple model of a three phase AC–network of 500/230kV, 5-bus network with two transformers and two power generation plants (1000MW, 500MW) is designed. UPFC is designed with IGBT converters connected in shunt- series and both interconnected with DC bus and connected to AC side with transformer and coupling reactors. A contingency case is considered such that two transformers are considered instead of three transformers. The power flow of an UPFC installed at Bus-3 in 5-bus system is analyzed to show how the congestion of power on the grid is relieved through it. A bypass circuit breaker is installed at Bus -3 in the circuit to show the natural power flow without UPFC and power flow after installation of UPFC. The topology of series converter build in UPFC can introduce maximum of 10% of line-ground voltage in series. The simulation network of the 5-bus transmission network with UPFC connected at Bus-3 is designed with MATLAB/SIMULATION Software to estimate the power flow with UPFC connected.
Highlights
Due to heavy load demand, the transmission lines are forced to operate at maximum limits
Remaining of this paper is organized as: section II presents the modeling of Unified Power Flow Controller (UPFC) for congestion management; section III describes the SIMULINK model of UPFC for congestion problem, section IV deals with the results and discussion and section V concludes problem
This paper is simulated in MATLAB SIMULINK environment which is run on Intel(R) core(TM), i3 processor at 2.20 GHz, 4 GB of RAM
Summary
Due to heavy load demand, the transmission lines are forced to operate at maximum limits This causes many congestion problems in deregulated power system. Author in [8] presented a novel technique for congestion management in 5-bus network by controlling the active power flow using TCSC and author considered sensitive analysis for location of TCSC device. The author in [9] presented the rescheduling of generators to control active power with congestion management simultaneously reducing the cost of rescheduling. In this paper congestion problem occurs in transmitting the power using two transformers instead of three This congestion problem is studied considering 5-bus network and using of Facts device such as UPFC at the bus with congestion problem. Remaining of this paper is organized as: section II presents the modeling of UPFC for congestion management; section III describes the SIMULINK model of UPFC for congestion problem, section IV deals with the results and discussion and section V concludes problem
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