Mohd Tauseef Khan

A modified algorithm for time varying reactive power control and harmonics compensation by D-STATCOM

This paper presents a modified id-iq based control algorithm for time varying active and reactive power control and load harmonics compensation by DSTATCOM under load fluctuations. The proposed scheme of control algorithm has been introduced for enhancing steady-state performances in addition to useful elimination of power quality disturbances. Employing a preexisting D-STATCOM to attain these added control purposes can advantage system handling operators to maximize complete response of the system. For regulating the time varying active and reactive power control, an extra current control loop system is provided and consequently comprised in the control block. To validate its application, a 200-V electricity feeder with a 3-phase rectifier as a non-linear load was simulated. Results obtained proved that addition of an extra control loop of current component of reactive power can regulate active as well as reactive power drawn on controlled feeder completely under the fluctuations of load.reactive power controltime varying active power controlload harmonics compensationload fluctuations.control algorithmsteady-state performancespower quality disturbances.

Power Systems Reliability- A Bibliographical Survey

Abstract With deregulation of electricity sector, maintenance and reliability of power system network has become a major challenging task for an independent system operator. The power supply reliability influences customer satisfaction and hence choice of suppliers. There is a growing interest in investigation and development of new tools, methods, and models for evaluating reliability of power system network. This paper provides a bibliographical survey of current state of development, research and applicable tools in evaluation of power system reliability.

Optimal Placement of Distributed Generation and D-STATCOM in Radial Distribution Network

Abstract Analytical approach-based technique was used in this work for finding the optimized size and location for distributed generations (DG) and Distribution Static Compensator (D-STATCOM) placement in a distribution network. Optimum placement of DG and D-STATCOM mitigated the power losses and improved the voltage profile in a radial distribution system. This technique was tested on a 33-bus radial distribution system through a voltage stability index and loss sensitivity factor, thereby determining the best possible size and optimal location for DG and D-STATCOM. The changes in voltage profile and active power losses were compared before and after installation of these devices in the distribution system. Analytical approach based technique was used in this work for finding the optimized size and location for DG and D-STATCOM placement in a distribution network. Optimum placement of DG and D-STATCOM mitigated the power losses and improved the voltage profile in a radial distribution system. This technique was tested on a 33-bus radial distribution system through a voltage stability index and loss sensitivity factor, thereby determining the best possible size and optimal location for DG and D-STATCOM. The changes in voltage profile and active power losses were compared before and after installation of these devices in the distribution system.

An approach to locate tcsc optimally for congestion management in deregulated electricity market

Congestion mitigation is one of the major problem faced by the transmission system operator in deregulated electricity market. In this paper, a congestion management approach based on optimal placement of thyristor controlled series capacitor (TCSC) in deregulated environment has been proposed. The most critical line having highest probability of occurrence of congestion is investigated. The optimal location for TCSC placement to mitigate congestion is found based on probability of occurrence of congestion in a transmission line. The performance of proposed technique is tested on IEEE 14-bus system.

An improved SRF based control algorithm for D-STATCOM under abnormal source voltage

This paper describes an improved SRF (Synchronous Reference Frame) based control technique or algorithm for time varying power flow control and optimum load compensation of non-linear loading under abnormal or disturbed source voltage by D-STATCOM designed for three-phase three wire systems. The improved algorithm is based on the active power separation and imaginary symmetrical components of voltage and has been compared with conventional IRP based algorithm to show the preciseness in finding the reference current for a DSTATCOM under abnormal i.e. asymmetric and distorted source voltage. Individually the algorithms were implemented and simulated under MATLAB/Simulink. The simulation results also show which algorithm can accurately detect the harmonics and reactive component of load current even under the asymmetric and distorted source voltage condition. Additionally by the control loop of reactive power of improved algorithm, load reactive power can be compensated as well as regulated under variations of load. Thus this additional control arrangement can help system operators improve overall system performances.

Mitigation of Market Power in deregulated power system using Nash Equilibrium

Market Power is one of the major issues present in deregulated power system. Some of the participants game the constraints to gain large market power which results in inefficiency, higher costs and low consumer benefit. The paper discusses the market power, its analysis and mitigation technique. Nash Equilibrium is used in this paper to mitigate the market power. Two cases are discussed in this paper; market power without transmission constraints and market power with transmission constraints. Market power with transmission constraints presents more complex situation, as one or more participants can game the constraints and can create an artificial congestion. Three generator hypothetical situation is simulated for analysis and mitigation of market power.