About Me |
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Ashish Ranjan Dash, was born to Mr. Narayan
Chandra Dash and Mrs. Shantilata Dash on 12th June, 1982 in Jajpur,
Odisha, India. He received his B.Tech degree in Electrical Engineering from
Government College of Engineering, Keonjhar (India) in the year 2006, and M.Tech
degree in Electrical Engineering from National Institute of Technology Rourkela
(India), in 2012. He joined as a Research Associate in the Department
of Electrical Engineering at National Institute of Technology Rourkela under
the project sponsored by Council
of Sceintific and Industrial Research (CSIR), India. He is awarded with Ph.D degree in 2019 from
Department
of Electrical Engineering National Institute of Technology Rourkela
. He has teaching and research experience of around 11 years. His research interests include power quality, power electronics,
multilevel inverters, custom power devices, active power filters, DC-DC
converters and artificial intelligence.
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This paper proposes a cascaded transformer coupled multilevel inverter which acts as a shunt active filter for harmonic mitigation under different supply main condition. The proposed multi level inverter operates with a single DC-link capacitor which signifies equivalent power circulation between the modules of the inverter. The complete architecture of the developed topology is elaborated along with its control application. For harmonic current extraction an Empirical mode decomposition based control is applied to extract the fundamental load current which helps in estimating the reference current. The modulation signals are created by comparing the reference with the phase shifted PWM technique. Finally the presented control technique is applied in the developed topology of Shunt active filter and verified by simulation and hardware results.
In this paper, Pulse width modulation techniques for multi-level inverter are compared, evaluating their performance for various converter parameters. The study has been applied for a seven-level cascaded H-bridge multi-level inverter with a single dc source employing single phase transformer. There are several techniques for modulation of multilevel converters. But their performance is not similar under various inverter topologies and from different applications prospective. Moreover, they differ from each other by their ease of real time implementation. Therefore, an optimization has to be made considering all the above mentioned features. The simulation and experimental results demonstrate the effectiveness of the proposed configuration with level shifted PWM, phase shifted PWM and space vector PWM.
In this paper, a Cascaded H-Bridge Multilevel Inverter (CHBMLI) is proposed and designed with single dc source employing single-phase transformers to operate as a shunt active filter for harmonic reduction. The paper studies the complete architecture and control logic of the proposed multilevel inverter. For harmonic current extraction an improved instantaneous active and reactive power control technique is used for reference current generation. Phase shifted PWM technique is used for the modulation of CHBMLI. Finally a seven level CHBMLI is developed to operate as a shunt active filter. The proposal and performance are validated through simulation results.
In this paper, Pulse width modulation techniques for multi-level inverter are compared, evaluating their performance for various converter parameters. The study has been applied for a seven-level cascaded H-bridge multi-level inverter with a single dc source employing single phase transformer. There are several techniques for modulation of multilevel converters. But their performance is not similar under various inverter topologies and from different applications prospective. Moreover, they differ from each other by their ease of real time implementation. Therefore, an optimization has to be made considering all the above mentioned features. The simulation and experimental results demonstrate the effectiveness of the proposed configuration with level shifted PWM, phase shifted PWM and space vector PWM.
he next generation of power system is expected to be more complex and sensitive. Therefore, controllers implemented for a custom power device must be efficient and adaptive. In order to mitigate the power quality problems, a Modified Leaky Least Mean Square (MLLMS) control algorithm for a three-phase Supercapacitor based Shunt Active Power Filter (SSAPF) is proposed in this paper. Especially, the efficient control algorithm meant for power quality improvement by compensating source current harmonics, load unbalancing and reactive power flow in the system. Suitable switching pulses required for Voltage Source Converter (VSC) of the SSAPF are generated followed by the reference current generation and extraction of fundamental active and reactive power components from harmonic rich three-phase load currents. The supercapacitor is coupled with the VSC to make the DC-link voltage constant and ripple free during faults in the system. The performance of the SSAPF using a MLLMS control algorithm is conducted in the MATLAB software.
In this paper, a fuel cell is integrated into a voltage source inverter (VSI) based DSTATCOM for power quality improvement in a distribution system. An efficient control technique called “i-cos-theta†(IcosΘ) control algorithm is chosen to make the distribution system stable and harmonics free even under unbalanced load (single phase fault) condition. The fuel cell is intended to maintain the DC-link voltage of the VSI-DSTATCOM so that excess switching losses and conduction loss of the DSTATCOM due to a single phase fault, can be eradicated. The DC-link voltage is almost constant during steady-state operation, and even an acceptable voltage regulation of 3.35% is achieved during fault conditions. Further, the system supply current is maintained balance, and has the total harmonic distortion (THD) well-below 5%, thus it is satisfying the IEEE-519 standard on the harmonic limit. Moreover, simulation of the proposed system has been performed in SimPowerSystem (SPS)/MATLAB Simulink software.
n recent years, a number of industry applications increased with the use of advanced power electronics devices and frequency inverter fed induction motor. This study presents a highly reliable 3-phase dual-buck half-bridge shunt active power filter (DB HB APF) for the elimination of current harmonics produced by these non-linear loads. The dual buck inverter circuit effectually eliminates the undesirable “shoot-through†occurrence ensues in conventional inverter circuit. The fuzzy based id-iq control strategy with adaptive hysteresis has been adopted to generate the reference compensating current. For validation, the proposed topology is implemented in the OPALRT LAB uses OP5142-Spartan 3 FPGA.
his paper proposes a multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) based active power filter using Type 1 fuzzy logic controller (T1FLC) and multicarrier PWM i d -i q control scheme with no shoot-through phenomenon. The conventional cascaded full-bridge inverter is comprised of multiple numbers of modular inverter cells and every single modular inverter cell consists of two power devices in each leg, however it still suffers from the shoot-through phenomenon with decreased reliability. As no shoot-through occurrence in each modular full-bridge interleaved buck inverter of its cascaded multilevel inverter, there is copious improvement in the reliability as likened to other cascaded inverters. Additionally, the dead time introduction does not necessitate in the full bridge interleaved buck inverter, as in conventional, which easily pushes the theoretical limit of duty cycle, and hence full energy transfer takes place to the load by pulse width modulation (PWM). The performance of multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) along with the application as a shunt active power filter (APF) has been described in detail for the different voltage source condition. Simulation and OPAL-RT experimental results are presented for the validation of this multilevel cascaded full-bridge interleaved buck inverter based shunt active power filter.
It is the general trend to increase the electricity production using distributed power system (DPGS), which is based on renewable energy sources such as wind, solar, fuel cell etc. These systems are to be properly controlled in order to provide reliable power to the utility network. For that power electronics converters are used as an interfacing device between DPGS and utility network. In case of unbalanced fault, the major problem in distributed power generation system is the phase unbalance which causes the power quality problem along with grid instability. This paper discusses the implementation of two different controllers namely Proportional - integral (PI) and proportional resonant (PR) controllers in order to obtain the control of grid side converter during single phase to ground fault. The analysis includes the grid current harmonic distortion along with the variation of active and reactive power during the fault condition. The system is simulated using MATLAB software and simulation results demonstrate the effectiveness
Fault detection and classification is a key challenge for the protection of High Voltage DC (HVDC) transmission lines. In this paper, the Teager–Kaiser Energy Operator (TKEO) algorithm associated with a decision tree-based fault classifier is proposed to detect and classify various DC faults. The Change Identification Filter is applied to the average and differential current components, to detect the first instant of fault occurrence (above threshold) and register a Change Identified Point (CIP). Further, if a CIP is registered for a positive or negative line, only three samples of currents (i.e., CIP and each side of CIP) are sent to the proposed TKEO algorithm, which produces their respective 8 indices through which the, fault can be detected along with its classification. The new approach enables quicker detection allowing utility grids to be restored as soon as possible. This novel approach also reduces computing complexity and the time required to identify faults with classification. The importance and accuracy of the proposed scheme are also thoroughly tested and compared with other methods for various faults on HVDC transmission lines.
he paper describes the design aspect and control logic of a cascaded multilevel inverterâ€based shunt active filter by employing singleâ€phase toroidal core transformers in cascaded manner which enable to operate with a single DCâ€link capacitor. The presented topology uses a single DCâ€link capacitor, thus minimizing the number of sensors and controller for voltage balancing. The induction of cascaded toroidal core transformer makes the system highly reliable as it minimizes the failure possibility of the DCâ€link capacitor. For reference current generation, a perfect harmonic cancelation (PHC) control technique is implemented which is insensitive to distorted input condition and frequency deviation. To verify the effectiveness of the PHC controller, it is compared with a wellâ€known idâ€iq control technique under ideal and nonâ€ideal supply main conditions. Furthermore, the developed topology is validated through MATLAB simulation and its prototype along with a wellâ€known DSPâ€based FPGA controller.
his paper describes an empirical mode decomposition control algorithm to extract the fundamental component and set the reference for harmonic extraction in a cascaded multilevel inverter–based shunt active filter. The proposed technique is fully reliant on the data samples that are decomposed instantaneously and does not require any weighing factor. The fundamental component of load current is found by applying a novel empirical mode decomposition algorithm from the nonlinear load current samples. Spline interpolation is used to extract the intrinsic mode function. For online implementation, the maxima and minima points of load current are stored using a modified field programming gate array (FPGA)â€based circular buffer circuit. Finally, the proposed cascaded multilevel inverter–based shunt active filter is investigated both by simulation and hardware implementation. The results obtained validates the performance of the proposed control technique under balanced and unbalanced loading conditions.
In this study, a real-time empirical mode decomposition (RT-EMD) based control technique is adopted for effective mitigation of system harmonics under ideal and non-ideal supply voltage conditions. The proposed control algorithm takes the active component of load current samples and the positive sequence voltage component for generating the desired reference. The fundamental component of load current is found by employing RT-EMD, which decomposes the distorted non-linear sample into a finite number of fine-scale signals termed as intrinsic mode function (IMF). Each IMF is extracted adopting continuous calculation of upper and lower envelopes using a series pipeline structure which decreases the computational complexity. The proposed control algorithm takes the positive sequence voltage component for generating the desired reference so that the system can operate in non-sinusoidal grid voltage conditions. The proposed control algorithm adopts carrier-based modulation scheme for switching of the inverter module. The effectiveness of the proposed control approach is investigated in MATLAB-Simulink environment with balanced and unbalanced loading condition and its experimental validation is carried out by a hardware prototype model using a Spartan 6 FPGA controller.
In this study, the design and implementation of a new hybrid soft computing control technique called Levenberg–Marquardt backpropagation (LMBP)-based icosϕ is proposed. Two different compensation techniques are evaluated for the performance analysis of three-phase three-wire (3P3W) voltage source converter (VSC)-based DSTATCOM. The first one is the conventional icosϕ control technique whereas the other one is called the LMBP-based icosϕ control technique. The better power quality of the system is obtained using the proposed control algorithm by maintaining a less voltage across the capacitor as compared to the conventional one. So, the reduction in the size of the DSTATCOM is realised by the LMBP-based control algorithm. Furthermore, the performance parameters such as load balancing, harmonics elimination, power factor improvement, and voltage regulation are evaluated under both balanced and unbalanced loading conditions as per the IEEE guidelines. The effectiveness of the proposed controller is studied in the MATLAB/Simulink environment and also validated with a low power rated prototype experimental results
In this study, the design and implementation of a new hybrid soft computing control technique called Levenberg–Marquardt backpropagation (LMBP)-based icosϕ is proposed. Two different compensation techniques are evaluated for the performance analysis of three-phase three-wire (3P3W) voltage source converter (VSC)-based DSTATCOM. The first one is the conventional icosϕ control technique whereas the other one is called the LMBP-based icosϕ control technique. The better power quality of the system is obtained using the proposed control algorithm by maintaining a less voltage across the capacitor as compared to the conventional one. So, the reduction in the size of the DSTATCOM is realised by the LMBP-based control algorithm. Furthermore, the performance parameters such as load balancing, harmonics elimination, power factor improvement, and voltage regulation are evaluated under both balanced and unbalanced loading conditions as per the IEEE guidelines. The effectiveness of the proposed controller is studied in the MATLAB/Simulink environment and also validated with a low power rated prototype experimental results
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