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This paper explores the modeling of a Proportional Integral (PI) and fuzzy logic controller (FLC) based, shunt active power filter (SAPF) for a three wire network to compensate current harmonics fed to a nonlinear load. In the fuzzy logic controlled SAPF mathematical model of the system is not required since it is based on an inference system incorporating intelligence derived through human expertise...
This paper focuses on the modern approach for Model Predictive Direct Torque Control(MPDTC) concept using a neutral point clamped inverter fed induction drive. The proposed methodology is significant for the medium voltage drives. The proposed scheme is a noble technique which predicts the next possible voltage vector and the switching of the inverter from the predefined prediction horizon which is...
Solar energy is a non-conventional type of energy. Only a small fraction of the available solar energy is used in practice. Solar powered electrical generation relies on photovoltaic system and heat engines. To harvest the solar energy, the most common way is to use photovoltaic panels which will receive photon energy from sun and convert to electrical energy. The efficiency of PV module is very low...
This paper presents single phase matrix converter (SPMC) topology capable of generating a higher output frequency which is used for high frequency applications such as induction heating. Proposed configuration reduces total harmonic distortion (THD) of supply current with the injection of LC resonant filter at the supply end. By the analysis of dominant side band components of the supply current,...
This paper proposes a modified phase shift pulse width modulation technique which is suitable for both single phase and three phase system for a conventional cascaded H bridge multilevel inverter. The carrier phase shift PWM method which is proposed in this paper improves the output voltage waveform and reduces the total harmonic distortion when compared with the conventional phase shift PWM method...
In modern power distribution system, use of nonlinear loads has increased drastically. Due to these nonlinear loads, power quality of the system is decreasing. Hence there is necessity of improving power quality of the system. Distribution Static Compensator (DSTATCOM) is a shunt connected custom power device, used in distribution system for performance improvement. DSTATCOM will maintain constant...
This paper proposes a new approach to calculate optimal firing angles of a Seven-Level Cascaded H-bridge Multilevel Inverter(CHB-MLI) using Gravitational Search Algorithm(GSA). The presence of more levels in the output voltage waveform of MLI introduces large harmonic content which should be reduced. Selective Harmonic Elimination(SHE) method is the popular technique used for eliminating the desired...
Dynamic voltage restorer (DVR) is utilized to shield delicate loads from harmonic distortion, sag/swell, and unbalance in supply voltage monetarily. In this paper, Fuzzy Logic control based control scheme has been created for the generation of remunerating voltages for controlling DVR. This scheme can controlled both linear and non linear loads efficiently. For creating voltage sag/swell and voltage...
In this paper, Islanding and Power Quality(PQ) Issues in Hybrid Distributed Generation(DG) System consists of Photovoltaic(PV) system and Wind Power Plant connected to grid through a Point of Common Coupling(PCC), are detected and classified, using Wavelet Transform (WT) and Artificial Neural Networks (ANN). A new effective approach is proposed using WT indices and loading of DG on detection and classification...
Reduced Voltage Source Multicell Converters are one of the best alternative for Capacitor Multicell Converter, as the former uses only a single voltage source as compared to the later which uses two voltage sources for a single phase converter. In this paper three different levels (i.e., 5 level, 7 level and 9 level) of reduced voltage source multicell converters are analyzed by taking THD as an analyzing...
This paper deals with the modelling, simulation and implementation of a Fuzzy logic controlled Cuk converter-Inverter fed Induction motor drive. This work proposes PV fed Cuk converter to produce required DC voltage at the input of inverter. The output of the Photo Voltaic (PV) system is boosted using a Cuk converter. The output of the Cuk converter is inverted and applied to a three phase induction...
This paper mainly concentrates on development of closed loop system for five level H-bridge type flying capacitor multilevel inverter (FCMLI). This paper uses H-bridge type FCMLI in which clamping capacitors are of equal value which increases the voltage between two consecutive arms, hence size of voltage steps in the output waveform, eliminating lower order harmonics. Recent researches show that...
Multilevel inverters are best suitable for high power applications as they provide quality output waveform with less amount of voltage and current stresses on the switching elements which ensure good quality performance, among the various topologies of multilevel inverter cascaded H-Bridge is more reliable, simple in design and can be implemented easily and has better performance compared to other...
The optimization of levels with a minimum number of power supplies can be achieved by using Asymmetrical multilevel inverters. An asymmetrical multilevel inverter topology is presented in this paper for medium voltage application. It is based on the series(cascade) connection of the several H-bridge inverter cells powered by the supplies which are in Geometric propagation with different ratios like...
Due to the driving worldwide environmental demand for the renewable energy resources the photovoltaic power market in the recent years experiences certain amount of the innovations regarding the construction and the operation of the inverter connected to the grid. One such significant development, is that the abolition of the galvanic isolation due to the absence of the transformer which causes safety...
This paper presents a design control circuit for cascaded Half-bridge multilevel inverter based on PV connected to the grid. The main objectives of the proposed circuit is to get a high number of output voltage levels for the grid without stepup transformer and reducing the Total Harmonics Distortion (THD). Then the proposed circuit is controlled by an advanced control method, which is based on direct...
In this paper a simple modulation strategy is briefly described and compared with the traditional popular space vector modulation (SVM) for the operation of 3-phase matrix converter. Both the techniques have been implemented in MATLAB/Simulink environment and input grid side current harmonics with the variation of modulation index, output frequency has been observed. Also investigation of inherent...
This paper deals with a novel seven level cascaded multilevel inverter. Almost all the drawbacks of the conventional multilevel inverters is rectified by the proposed topology. This topology uses less number of switches (particularly in higher levels) as compared with conventional topology, where it reduces the complexity and overall size of the system which in turn reduces the harmonics and cost...
The electrical power quality at low voltage alternative networks became a serious concern because of the increased use of non- linear loads and pollutants. This work is to improve the quality of electric current in such networks. Four-Wire Shunt Active Filter is studied; deferent loads (balanced and unbalanced) are discussed. We propose to identify harmonic and reactive currents at the base of Self-Tuning-Filters,...
In this paper we present evaluation of two pulse width modulation techniques for two level inverters employed in a grid connected wind energy conversion systems(WECS). Sine pulse width modulation is the most simple modulation technique employed for inverters. However it has disadvantages like very narrow linear range, higher total harmonic distortion value(THD) and does not make effective utilization...
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