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ABSTRACT: Hybrid active power filters are used for reducing harmonics in the power system. This paper deals with different topologies of hybrid active power filter discussed along with their control. In a hybrid active power filter the active power filter is used to filter out higher order harmonics, while the lower order harmonics are filtered by the passive filters tuned for particular frequency. This combination reduces the cost and size of active power filter considerably; at the same time the problems associated with passive filter installed alone are also eliminated. With this study a comparison of different topologies of hybrid active power filter is presented on different indices such as THD, complexity and cost and topology- I has been proven to be superior. Here active power filter of HAPF is of voltage source inverter type with current control, the passive filters are tuned to fifth and seventh harmonic frequencies, the source taken is 3-phase, 3-wire type and a 3-phase diode rectifier with resistive load is considered as load. The simulation is done on MATLAB / Simulink-PSB.
Information and Communication Technology in Electrical Sciences (ICTES 2007), 2007. ICTES. IET-UK International Conference on; 01/2008
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ABSTRACT: Use of conventional two-level pulse width modulation (PWM) inverters provide less distorted current and voltage but at the cost of higher switching losses due to high switching frequencies. Multilevel inverters are emerging as a viable alternative for high power, medium voltage applications. This paper compares total harmonic distortion and switching losses in conventional two-level inverters with multilevel inverters (three-level and five-level) at different switching frequencies. An optimized switching frequency has been obtained for a lower level of total harmonic distortion and switching losses. Diode-clamped, three-phase topology is considered for study. A sinusoidal PWM technique is used to control the switches of the inverter. Simulation study confirms the reduction in harmonic distortion and switching losses as the number of the levels increases.
IETE Journal of Research. 01/2008;
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ABSTRACT: Power quality is the major area of research interest amongst scientists. This is because of awareness created by IEEE 519-1992 like standards which implies the utility as well as consumers of electric power to improve the power quality. This paper investigates the potential of multi-pulse converter to be used as power quality solution. Six, twelve, eighteen and twenty four pulse converters have been modeled and simulated in Matlab environment. A vast comparison is also presented among them
Power India Conference, 2006 IEEE; 05/2006
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ABSTRACT: Current and voltage harmonics have attracted growing interest with the increase in use of static power converters. These converters produce distorted current and voltage waveforms. The result is harmonic pollution that degrades the power quality. To provide safe operation and to meet harmonic standards such as IEEE 519, it is necessary to eliminate harmonic distortion and improve power quality of the system. This paper presents detailed modeling, simulation and analysis of neutral point clamped three-level inverter. Various performance parameters of multilevel inverters have been investigated with three-phase induction motor load. Besides maintaining DC bus voltage balance, a significant reduction is seen in voltage distortion at neutral point in the simulation. The viability of using three-level neutral point clamped inverter in high power systems is proven by simulation using Matlab/Simulink/power system blockset. The space vector modulation (SVM) technique has been employed to get rid of common mode voltages by switching among different states in SVM
Electrical Machines and Systems, 2005. ICEMS 2005. Proceedings of the Eighth International Conference on; 10/2005
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ABSTRACT: This paper presents modeling and simulation of a shunt active power filter in frequency domain, using MATLAB and its tools Simulink and Power System Blocket. The proposed method offers many additional features over other methods. It attributes the responsibility of utility and customer at PCC. It provides an additional feature of compensation of either harmonics only, or the compensation of both harmonics and reactive power simultaneously, based on the desired capacity of the APF
Electrical Machines and Systems, 2005. ICEMS 2005. Proceedings of the Eighth International Conference on; 10/2005
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ABSTRACT: In the last few years, massive use of the nonlinear and time varying devices has led to distortion of voltage and current waveforms. Increased power quality disturbances and implementation of various standards and guidelines such as IEEE-519 have encouraged both utility and customers to share their responsibilities, to maintain power quality disturbances within the acceptable limits. Harmonic distortions are considered one of the most significant reasons for power quality problems. An attempt is being made here to know the existing level of harmonic pollution present in the Indian power system. Harmonic content of some of the very commonly used loads and residential areas is studied. A survey is also presented to know the harmonic level present at the distribution system.
India Annual Conference, 2004. Proceedings of the IEEE INDICON 2004. First; 01/2005
