Informatics Publishing Limited

M. Prabavathi ¹, R. Gnanadass ¹

Affiliations
1 Pondicherry Engineering College, Pondicherry - 605014, IN

Abstract

In the restructured power systems, ancillary services markets have been established in most of the regions throughout the world. Ancillary services take part in a vital role in electricity market for the reliable and economic operation of the power system. For any imbalance in the supply and demand, the frequency of a system changes from its nominal value. Hence ancillary services are needed to maintain the frequency at its standard value. In this paper, a framework for ensuring power system reliability in competitive power markets is developed based on a market for frequency regulation ancillary services.

Keywords

Ancillary Services, Frequency Response, Automatic Load Frequency Control, Unscheduled Interchange Price, Availability Based Tariff, Market Clearing Price.

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P. M. Balaji ¹, B. Rami Reddy ¹, R. Gnanadass ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Pondicherry University, Pondicherry Engineering College, Puducherry, IN

Abstract

This paper describes a Wind turbine coupled doubly-fed induction generator (DFIG) for modern wind energy conversion scheme. A grid side converter control is performed to maintain synchronism of DFIG with the Electrical Grid. The limitation of DC-link voltage fluctuation for an AC-DC-AC converter is analyzed. The converters allow four-quadrant operation in the P-Q plane by adjusting its switching pattern, thereby paving way for several drive applications. An improved control strategy with the instantaneous rotor power feedback is proposed to limit the fluctuation range of the dc-link voltage. A decoupled P-Q controller to regulate the DC link voltage is implemented using MATLAB/Simulink, and the effect of variations in grid side voltage on the converter performance is examined.

Keywords

DC-Link Voltage, Doubly Fed Induction Generator (DFIG), d-q Vector Control and Grid Side Converter.

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R. Rajathy ¹, R. Gnanadass ², Harish Kumar ³

Affiliations
1 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry, IN
2 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry, IN
3 Department of Physics, Pondicherry Engineering College, Puducherry, IN

Abstract

To meet the growing load demand, power industries throughout the world are undergoing restructured process in which the Independent Power Producers (IPP) must respond quickly to the load changes with respect to time. This paper describes the solution for Optimal Power Flow (OPF) in competitive market using Differential Evolution (DE)technique. The proposed approach is capable of obtaining minimum solution irrespective of the nature of the objective function. The effectiveness of the approach is compared with the performance of Particle Swarm Optimization technique and other published works. The obtained OPF solution satisfies the standard transient stability rotor/voltage criteria. The proposed algorithm has been demonstrated on IEEE 30 and Indian utility 62 bus systems with various case studies.

Keywords

Power System Deregulation, Optimal Power Flow (OPF), Differential Evolution (DE), Independent Power Producer.

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S. Baskar ¹, N. Kumarappan ¹, R. Gnanadass ²

Affiliations
1 Dept. of EEE, Annamalai University, Chidambaram, IN
2 Dept. of EEE, Pondicherry Engineering College, Puducherry, IN

Abstract

To investigate the capability of regulating power flow in Single Machine Infinite bus system using Unified Power Flow Controller (UPFC) is the main focus of this paper. This paper presents the dynamic operational characteristics of Unified Power Flow Controller using switching level model. The real & reactive power flow is controlled by varying the shunt converter firing angle and modulation index of the series converter. The simulation is carried out in Simulink based MATLAB environment. The simulation result proves that the UPFC makes the power factor of the system is unity and the total harmonic distortion of line voltage are effectively minimized. The proposed controller shows the good performance & effectiveness of controlling the real and reactive power and also damping the oscillation due to system faults.

Keywords

Linear Firing Angle Control, Single Machine Infinite Bus System, Switching Level Modeling, Unified Power Flow Controller.

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R. Rajathy ¹, R. Gnanadass ¹, K. Manivannan ¹, Harish Kumar ²

Affiliations
1 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry, IN
2 Department of Physics, Pondicherry Engineering College, Puducherry, IN

Abstract

In a competitive electric power market, the knowledge of available transfer capability (ATC) can help power marketers,sellers and buyers in planning, operation and reserving transmission services. Capacity Benefit Margin is an important factor in the calculation of ATC. In this paper, a new algorithm using Differential Evolution is proposed to calculate CBM. Monte Carlo method is used to calculate necessary loss of load indices. The proposed algorithm is tested on Practical Indian utility 62 bus test system. The results of proposed algorithm are compared with those obtained using Particle Swarm Optimization (PSO). It is found that DE yields better results than PSO.

Keywords

Total Transfer Capability (TTC), Differential Evolution (DE), Capacity Benefit Margin (CBM), Loss-of-Load Expectation (LOLE), Particle Swarm Optimization (PSO).

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