i-manager's Journal on Circuits and Systems (JCIR)


Volume 5 Issue 2 March - May 2017

Research Paper

Optimal Reference Power Tracking Of DFIG Converters Analysis at Low Wind Speedand Grid Disturbances Using Internal Model Controller

D.V.N. Ananth*
Assistant Professor, Department of Electrical Engineering, DADI Institute of Engineering and Technology, Anakapalli, India.
Ananth, D. V. N. (2017). Optimal Reference Power Tracking Of DFIG Converters Analysis at Low Wind Speed and Grid Disturbances Using Internal Model Controller. i-manager’s Journal on Circuits and Systems, 5(2), 1-19. https://doi.org/10.26634/jcir.5.2.13661

Abstract

A pitch angle control based MPPT for turbine is modeled and a sensor-less rotor speed and torque estimation are proposed in this paper. Rotor Side Converter (RSC) proposed helps to achieve optimal real and reactive power from generator, which keeps rotor to rotate at optimal speed and quickly vary current flow from rotor and stator terminals. Grid Side Converter (GSC) proposed helps to track grid reactive power demand or to setup synchronism when grid voltage changes with better response than earlier techniques. The RSC and GSC are designed based on characteristic look up table technique for identifying the grid and turbine operating conditions and give instructions accordingly. Here RSC and GSC control loops is designed depending on characteristic based lookup table techniques. These controllers are intended to maintain equilibrium in rotor speed, generator torque, and stator and rotor voltages. It is obtained using stator voltage, current and derived torque is used to track rotor speed. Moreover, it is desired to meet optimal reference real and reactive power during the turbulences like sudden change in voltage or reactive power with concurrently changing wind speed. The control of real and reactive powers is independent of the proposed technique. The sensorless controller can be connected or disconnected from running conditions. The Maximum Power Point Tracking (MPPT) algorithm with rotor converter is designed to improve mechanical power extraction from turbine – generator set. An internal model controller is used in place of conventional converters for better performance during disturbances. The performance of DFIG is compared to three cases, change from wind speeds, and alter in reactive power and in final case with variation in grid voltage.

Research Paper

Energy Conservation by Energy Audit and Use of Energy Efficient Lamps

Shekhappa G. Ankaliki* , Geetha M. M**, Divyabharati K.***, Bhagyashri P. M****, Jivita K.*****
* Professor, Department of Electrical and Electronics Engineering, SDM College of Engineering & Technology, Dharwad, Karnataka, India.
**-***** UG Scholar, Department of Electrical and Electronics Engineering, SDM College of Engineering & Technology, Karnataka, India.
Ankaliki , S. G., Geetha, M. M., Divyabharati , K., Bhagyashri, P. M., Jivita, K. (2017). Energy Conservation by Energy Audit and Use Of Energy Efficient Lamps. i-manager’s Journal on Circuits and Systems, 5(2), 20-28. https://doi.org/10.26634/jcir.5.2.13662

Abstract

This paper presents energy conservation by energy audit and use of energy efficient lamps. In order to conserve energy and reduce electricity charges, energy audit is done for lighting system used in educational buildings and domestic applications. After comparison of energy efficiency, illumination level and cost of different bulbs, LED (Light Emitting Diode) bulbs are suggested to conserve energy, enhance energy efficiency, and reduce electricity charges. In order to demonstrate the proposed approach, different case studies are considered for energy audit and conservation of energy for the sustainable future. Finally economic analysis of energy saving and investment on LED bulbs and payback period is determined.

Research Paper

Micro Hydro Power Familiarizing System Stand-In as a Smart Grid Pack ProposedFor Energy Depletion

Ch. Venkateswara Rao* , S. S. Tulasi Ram**, B. Brahmaiah***
* Professor, Department of Electrical and Electronics Engineering, Gandhi Institute of Engineering and Technology, Gunupur, Odisha, India.
** Professor, Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University, Hyderabad, India.
*** Principal, Sri Vasavi Engineering College, Tadepalligudem, India.
Rao, Ch. V., Tulasiram, S. S., Brahmaiah, B. (2017). Micro Hydro Power Familiarizing System Stand-In as a Smart Grid Pack Proposed For Energy Depletion. i-manager’s Journal on Circuits and Systems, 5(2), 29-40. https://doi.org/10.26634/jcir.5.2.13663

Abstract

The Hydroelectric power is generated by the rotating turbine through high pressure falling water that drives the generator. So far as electricity production is concerned, hydro-power is the most established and popular renewable resource. As a matter of fact, hydro-turbines have a very quick response for power generation and thus they are capable of handling the load variations. Besides, these can be directly connected to the grid. Among the renewable sources, Micro Hydro Power (MHP) is attractive because of its mature technology, spallation cheap cost, minimum civil work, manageable technology which is robust and reliable that it is applied for controller, generator, and turbine technologies. In this paper, a 60 KW, 132 KV synchronous generator with two controllers are designed and simulated to control the mechanical power input and another controller for controlling the excitation of synchronous generator and synchronous generator output at 13.8 KV is fed to load of 2 KW at 13.8 KV and then this 13.8 KV is stepped down to 400 V to feed the loads of 10 KW and 50 KW. Here 10 KW load is connected through the breaker, to provide load variations and 50 KW load of fixed type.

Research Paper

Modelling, Simulation, and Harmonic Reduction of Five Level Diode ClampedInverter Fed Induction Motor Drive

Khadim Moin Siddiqui* , Kuldeep Kumar**, V. K. Giri***
* Teaching-cum Research Scholar, Department of Electrical Engineering, IET, an autonomous institution of Dr. APJ Abdul Kalam Technical University, Lucknow, India.
** Professor, Department of Electrical Engineering, IET Lucknow, an autonomous institution of Dr. APJ Abdul Kalam Technical University, Lucknow, India.
*** Professor, Department of Electrical Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, India.
Siddiqui, K. M., Sahay, K., Giri, V. K. (2017). Modelling, Simulation, and Harmonic Reduction of Five Level Diode Clamped Inverter Fed Induction Motor Drive. i-manager’s Journal on Circuits and Systems, 5(2), 41-50. https://doi.org/10.26634/jcir.5.2.13664

Abstract

In the present time, the multilevel inverters gained a large interest by the researchers due to proficient power conversion with multiple voltage steps and consequently improved power quality, higher electromagnetic compatibility, reduced switching losses, and better voltage capability. Generally, the multilevel inverters are widely used in the industries for high power and high voltage applications. The multilevel inverter topology synthesizes a sinusoidal voltage from several levels of voltages obtained from capacitor voltage sources. This paper presents a three phase five level diode clamped inverter fed induction motor drive. The simulation of the model has been done in the latest Matlab/Simulink environment. The proposed simulation model gives efficient results with reduced harmonics in the stator current of the motor. Further, the harmonic analysis of the inverter voltages has also been done. Furthermore, for reduction of significant harmonics, active filter has also been used. This proposed simulation model may be used in many power electronics and drive applications.

Research Paper

Modeling of a PV Array and Implementation of an Efficient MPPT Based ControlMechanism in Stand-Alone Photovoltaic Systems

Aarti Anil Ahlawat* , Diksha Gupta**, S. K. Gupta***
* PG Scholar, Deen Bandhu Chotu Ram University of Science and Technology, Sonepat, Haryana, India.
** Project Engineer, Wipro Technology, Greater Noida, India.
*** Professor, Department of Electrical Engineering, DCR University of Science and Technology, Sonepat, Haryana, India..
Ahlawat, A., and Gupta, D. (2017). Modeling of a PV Array and Implementation of an Efficient MPPT Based Control Mechanism in Stand-Alone Photovoltaic Systems. i-manager’s Journal on Circuits and Systems, 5(2), 51-61. https://doi.org/10.26634/jcir.5.2.13665

Abstract

This paper provides a brief idea about modeling of Solar Photovoltaic systems. This paper presents simulation model of PV array which is used to evaluate the electrical performance of PV array with respect to changes in temperature and irradiation. The proposed paper includes design and simulation of a 10 kW Stand-alone solar photovoltaic system. The equivalent circuit model of a cell is simulated using Matlab/Simulink to examine a typical 235 W solar module and 10 kW solar PV array. In this paper, an MPPT tracker using modified Adaptive P & O algorithm is proposed to improve the efficiency of solar photovoltaic system. The algorithm identifies a particular duty ratio at which the DC-DC converter should operate to maximize the power output. The proposed model is designed with the help of Matlab/Simulink. The data provided by the manufacturer are used to calculate the non-linear parameters. The characteristic of the proposed model is compared with reference PV module. The 230 W PV modules manufactured by Sun module SW 230 poly/Version 2.0 and 2.5 Frame are used as a reference. The large solar PV array system is modeled and simulated using the data provided in this module. The proposed model results in improved performance of solar photovoltaic systems.