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Raja J.,National Power Training Institute | Rajan C.C.A.,Pondicherry Engineering College
Journal of Electrical Systems | Year: 2011

This paper analyses a comparative transient performance of six types of single machine power system. The six types of system configurations are viz. (i) AVR loop with Proportional Integral controller (PI) combined with AGC loop. (ii) AVR loop with single input CPSS combined with AGC loop. (iii) AVR with PI combined with SMES unit based AGC loop. For AGC loop both thermal unit and hydro unit are individually consider. (iv) AVR with CPSS combined with SMES unit based AGC loop. For AGC loop both thermal unit and hydro unit are individually considered. (v) AVR with FLC combined with FLC based AGC loop. For AGC loop both thermal unit and hydro unit are individually considered. (vi) AVR with FLC combined with SMES unit based AGC with FLC loop. For FLC based AGC loop both thermal unit and hydro unit are individually considered. The Thermal unit is either single or double reheat turbine. Hydro unit is considered with mechanical or electrical governor. Proportional Integral, Conventional power system stabilizer and fuzzy controller is provided in AGC loop. It is shown that the SMES based fuzzy controlled AGC loop along with fuzzy controlled AVR assist better transient performance of the power system in all cases under different operating conditions. © JES 2011.


Raja J.,National Power Training Institute | Rajan C.C.A.,Pondicherry Engineering College
Iranian Journal of Electrical and Computer Engineering | Year: 2011

This paper presents an application of layered ANN controller to study load frequency control problem in power system. The objective of control scheme guarantees that steady state error of frequencies and inadvertent interchange of tie-lines are maintained in a given tolerance limitation. The proposed controller has been designed for a two-area interconnected power system. Only one ANN, which controls the inputs of each area in the power system together, is considered. In this study, back propagation-through time algorithm is used as ANN learning rule. The performance of the power system is simulated by using conventional integral controller and ANN controller, separately. For the first time comparative study has been carried out between SMES and CES unit, all of the areas are included with SMES and CES unit separately. By comparing the results for both cases, the performance of ANN controller with CES unit is found to be better than conventional controllers with SMES, CES and ANN with SMES. © 2011 ACECR.


Parmar K.P.S.,National Power Training Institute | Majhi S.,Indian Institute of Technology Guwahati | Kothari D.P.,G.H. Raisoni College of Engineering
International Journal of Electrical Power and Energy Systems | Year: 2012

In this paper, load frequency control (LFC) of a realistic power system with multi-source power generation is presented. The single area power system includes dynamics of thermal with reheat turbine, hydro and gas power plants. Appropriate generation rate constraints (GRCs) are considered for the thermal and hydro plants. In practice, access to all the state variables of a system is not possible and also their measurement is costly and difficult. Usually only a reduced number of state variables or linear combinations thereof, are available. To resolve this difficulty, optimal output feedback controller which uses only the output state variables is proposed. The performances of the proposed controller are compared with the full state feedback controller. The action of this proposed controller provides satisfactory balance between frequency overshoot and transient oscillations with zero steady state error in the multi-source power system environment. The effect of regulation parameter (R) on the frequency deviation response is examined. The sensitivity analysis reveals that the proposed controller is quite robust and optimum controller gains once set for nominal condition need not to be changed for ±25% variations in the system parameters and operating load condition from their nominal values. To show the effectiveness of the proposed controller on the actual power system, the LFC of hydro power plants operational in KHOZESTAN (a province in southwest of Iran) has also been presented. © 2012 Elsevier Ltd. All rights reserved.


Kumar N.V.,National Power Training Institute | Sinha N.,Guru Gobind Singh Indraprastha University
International Journal of Technology and Globalisation | Year: 2014

The energy use in India is at present considerably higher than a few decades ago, mainly as a result of economic growth. The primary source of energy in India, thermal power, is a source of greenhouse gas emissions. To stabilise the CO2 emissions and promote sustainable development, economic development must go hand in hand with low-carbon society's development. A transition towards a green economy will require a shift away from current production and consumption patterns of energy. This is achievable through improved process and end-use energy efficiency, and increased adoption of cleaner energy sources. Fostering increased investments in clean energy and energy efficiency is an important step to achieving more sustainable economic development. Therefore, we have undertaken this study that attempts to examine the impact of FDI in Indian power sector on the path of clean energy. Copyright © 2014 Inderscience Enterprises Ltd.


Raja J.,National Power Training Institute | Christober Asir Rajan C.,Pondicherry Engineering College
Journal of Electrical Engineering | Year: 2012

In an isolated wind-diesel system, the variable power consumptions as well as the intermittent wind power may cause a large fluctuation of system frequency. If the system frequency cannot be controlled and kept in the acceptable range, the system may lose stability. Further to reduce system frequency fluctuation, CES which is able to supply and absorb active power quickly, can be applied. In addition, variation of system parameters, unpredictable power demands and fluctuating wind power etc., cause various uncertainties in the system. A CES controller which is designed without considering such uncertainties may lose control effect. In this paper quantitative feedback theory method is used for LFC control problem in Wind-Diesel system with system parametric uncertainties like parameter variations ±25% from their nominal value, ±30% load variations and wind variations. To show effectiveness of proposed method, a classical PI controller is designed for LFC for comparison with QFT.

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