Abstract:Congestion management is one of the important techniques to relieve congestion in transmission system. The usage of transmission line crosses the limits, then congestion occurs. Application of FACTS controllers is as a solution to the problem of congestion management. In the literature Genetic Algorithm (GA) based Optimum Power Flow (OPF) technique is used to determine the optimal location of Static VAR Compensator (SVC). But in this paper Unified-Power-Flow Controller (UPFC) is modeled and located in the system to relieve congestion, also compared with the SVC. This method was applied on IEEE 30-bus test system and a program was developed in MATLAB software environment.
This assessment represents a Multi-Input-Multi-Output-Proportional-Integral-Derivative (MIMO-PID) controller for load frequency balance issues.The objective of load frequency control is to minimize the transient deviations in area frequency and tie-line power. To improve the robustness of the system the transfer function H ∞ norm is used. So the proposed technique is known as PIDH ∞ controller. The LFC problem is articulated as a H ∞ SOF (State Output Feedback) control approach to attain the decentralized robust MIMO-PIDH ∞ controller. H ∞ controller is used here for accomplishing stabilization with definite performance. The optimization difficult is formulated and iterative LMI algorithm is used to tune the control parameters of the MIMO-PIDH ∞ controller. The simulation results show the proposed strategy is very effective and guaranteed good robust performance against the parametric uncertainties and load changes.
The nonlinear characteristics of power electronic-based loads in a power system contribute a major role in the harmonics’ injection and other power quality disturbances. This affects the quality of the power supplied to consumers by distribution systems. Flexible AC transmission system (FACTS) devices at the transmission level and custom power devices at the distribution level are used for an effective power transfer. In addition to these devices, filters play a prominent role in distribution systems. This paper aims to analyze the supply voltage in the time–frequency domain to perceive the variations in signal strength, explaining the role and significance of filters in mitigating or reducing harmonics. This paper presents the significance of harmonic filters in terms of signal-processing terminology. This depicts the prominent role of filters in improving the power quality by harmonic reduction or elimination, depending upon the requirement. The mathematical transform used in this approach is the short-time Fourier transform, which results in transforming the signal into a domain giving information about time and frequency. A MATLAB Simulink environment and ‘spectrogram’ were used to simulate harmonic signals, and we analyzed them using a short-time Fourier transform. Different windows were used with varying window size lengths.
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