12 results on '"Mohanty, Asit"'
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2. Performance of PV integrated multilevel inverter for PQ enhancement.
- Author
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Das, Soumya Ranjan, Ray, Prakash K., Mishra, Alok K., and Mohanty, Asit
- Subjects
ARTIFICIAL neural networks ,REACTIVE power ,ELECTRIC power filters ,ELECTRIC power distribution grids ,ESTIMATION theory - Abstract
Three phase shunt active power filter (SAPF) using multilevel inverter (MLI) is implemented in this paper for a grid integrated solar photovoltaic (PV) system for eliminating the harmonics. The objective in this work is to develop and regulate the grid integrated PV system for mitigation of harmonics with incorporation of SAPF. The PV integrated SAPF delivers the active/reactive power to the grid to reduce the harmonic contents. Harmonic compensation ability of SAPF is mainly achieved by employing suitable control technique to estimate the reference current signal. Here, adaptive artificial neural networks (AANNs) like adaptive neuro-fuzzy interference system (ANFIS), Widrow–Hoff adaptive linear neuron (WH ADALINE) and Modified Widrow–Hoff adaptive linear neuron (MWH ADALINE) are employed for generating the reference current of VSI in the MLI. The control techniques are tested in MATLAB/SIMULINK as well as real-time OPAL-RT environments. It is noticed that proposed MWH ADALINE-based SAPF design shows enhanced performance to maintain the power quality (PQ) by restricting the distortion level below 5% as per the IEEE/IEC standard. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
3. Adaptive fuzzy controlled hybrid shunt active power filter for power quality enhancement.
- Author
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Mishra, Alok K., Ray, Prakash K., Mallick, Ranjan K., Mohanty, Asit, and Das, Soumya R.
- Subjects
ELECTRIC power filters ,POWER distribution networks ,ELECTRICAL harmonics ,REACTIVE power ,IDEAL sources (Electric circuits) ,FUZZY logic ,PULSE width modulation transformers - Abstract
A novel switching pulse generation methodology based on adaptive fuzzy hysteresis current controlled hybrid shunt active power filter (A-F-HCC-HSAPF) is presented in this paper for compensating reactive power and harmonics in distribution network. The harmonic problems are mainly evolved because of extensive use of nonlinear loads in industry and domestic sectors. There are some adverse effects of harmonics such as: malfunctioning of sensitive equipment, resonance issues, conductors heating, power losses and reduced efficiency in distribution system. To mitigate harmonics issues passive, filters are used but when the harmonic component increases the design of passive filters is complex and becomes bulky. With the advancement in power electronic, the active power filter has been designed. Generally, the rating of the active filter is very high for some applications; hence hybrid shunt active power filter (HSAPF) is proposed by low-rated shunt active power filter (SAPF) and low-cost shunt passive filter. Proportional-integral or fuzzy logic controller is used to estimate the reference current and to regulate the dc capacitor voltage. To generate the switching pulse for the voltage source inverter of the SAPF, a novel adaptive fuzzy hysteresis current controller (A-F-HCC) is adopted. The performance of the proposed A-F-HCC-HSAPF is investigated during steady-state and transient conditions using MATLAB/Simulink and real-time environments. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
4. Stability and optimisation of direct drive permanent magnet synchronous generator based tidal turbine.
- Author
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Mohanty, Asit, Viswavandya, Meera, Ray, Prakash K., Panigrahi, Tapas K., and Mohanty, Sthitapragyan
- Subjects
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PERMANENT magnet generators , *REACTIVE power , *REACTIVE power control , *WAVE energy , *PERMANENT magnets , *TIDAL power - Abstract
Magnetic materials have become more and more user friendly in recent days particularly in an electronic based infrastructure. The study proposes a direct drive permanent magnet based Synchronous Generator as Tidal turbine in a hybrid tidal wave energy conversion system (TWECS) and discusses its performance for better stability. The objective of the study is to analyse the role of permanent magnet based generator in TWECS for overall improvement of stability through reactive power management. The isolated TWECS becomes unstable either by random load variations or by non uniform wind and tidal power inputs. Consequently the overall stability of the TWECS is brought to stable and normal stage by the control of reactive power with the inclusion of the custom power based devices. In addition to the effects of permanent magnet in case of DDPMSG for improving the overall system stability, optimisation tools like PSO, GSA and PSOGSA are added for further improvement in system performance. • Small signal modelling of DDPMSG based Micro grid has been implemented. • UPFC controller addresses the Reactive power compensation and stability issues of the Micro grid. • Comparison between DDPMSG and DFIG based systems are carried out with variable load and wind power inputs. • Stability analysis with nyquist, popov, Nichols are carried out. • Overall stability of the system is studied with Eigen values, participation factors. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
5. Fuzzy-Controller-Designed-PV-Based Custom Power Device for Power Quality Enhancement.
- Author
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Ray, Prakash K., Das, Soumya Ranjan, and Mohanty, Asit
- Subjects
FUZZY control systems ,PHOTOVOLTAIC power systems ,ELECTRIC filters - Abstract
In this paper, a three-phase series hybrid active filter (SEHAF) interconnected with photovoltaic (PV) system and dc–dc boost converter is proposed to minimize sag, swell, and harmonics caused due to nonlinear power electronic loads. The SEHAF consists of a voltage source inverter (VSI) with a capacitor connected across it to provide consistency in managing and compensating the reactive power. This minimizes the sag, swell, and harmonics present in the source and load voltages. With the integration of PV, the voltage across the dc-link capacitor of VSI is controlled effectively, which helps in better compensation. Reference current generation is done using the proposed robust extended complex Kalman filter (RECKF) technique. The performance of the PV-integrated-HAF is analyzed using a synchronous reference frame with proportional-integral (PI) as well as fuzzy logic controller (FLC) and is compared with the proposed RECKF technique. The PV-integrated hybrid power system is developed using MATLAB/SIMULINK. Further, real-time digital simulation using OPAL-RT OP5142 is also carried out to support the simulation results. It is observed that the proposed control scheme provides better harmonic compensation compared to conventional PI and FLC. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
6. Restoration of stable voltage in an isolated hybrid solar power system with combined JAYA-DE algorithm.
- Author
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Viswavandya, Meera, Mohanty, Asit, Ray, Prakash K., Sthitapragyan, and Paramita, Pragyan
- Subjects
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REACTIVE power , *STATIC VAR compensators , *HYBRID power systems , *ELECTRIC potential , *ALGORITHMS , *HYBRID power - Abstract
Abstract This work discusses the implementation of JAYA-DE algorithm with Static Var Compensator for optimum voltage control through Reactive Power compensation inside solar based hybrid power system.The stability aspect of isolated solar based hybrid power system is enhanced through compensation of the reactive power by optimized SVC and are further analyzed with different stability criterion. The dynamic performance of the new hybrid technique under intermittent wind power input and variable load show superiority over the conventional control methods. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
7. Modelling, simulation and optimisation of robust PV based micro grid for mitigation of reactive power and voltage instability.
- Author
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Mohanty, Asit, Viswavandya, Meera, Mohanty, Sthitapragyan, Ray, Prakash K., and Patra, Sandipan
- Subjects
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ROBUST control , *REACTIVE power , *ELECTRIC potential , *WIND turbines , *VOLTAGE regulators - Abstract
This paper proposes a robust H-infinity STATCOM controller for compensating reactive power in stand-alone micro grid consisting of a PV–Wind–Diesel hybrid system. In order to carry out MATLAB based simulation, a small signal linear model of the stand-alone hybrid power system is considered, comprising of a photo voltaic cell, a DFIG based wind turbine and a diesel generator. Synchronous generator based DG acts as a backup for the hybrid system. Generally these standalone systems experience frequent variation of loads, wind power input and solar radiation, which affect the vital system parameters like reactive power, terminal voltage and frequency to a great extent. These variations of system parameters with variation of load inputs are studied and its impact on overall system stability and reactive power compensation is properly monitored. Furthermore the system performance is improved and the robustness of the controller is enhanced with the incorporation of GA and PSO. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
8. An optimised FOPID controller for dynamic voltage stability and reactive power management in a stand-alone micro grid.
- Author
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Mohanty, Asit, Viswavandya, Meera, and Mohanty, Sthitapragyan
- Subjects
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PID controllers , *ELECTRIC potential , *ELECTRIC power system stability , *REACTIVE power , *SMART power grids - Abstract
This paper proposes the application of fractional order PID controller (FOPID) for reactive power compensation and stability analysis in a stand-alone micro grid. For enhancement of voltage stability and reactive compensation of the isolated system, a SVC based controller has been incorporated. This paper emphasizes the role of fractional PID based SVC controller for reactive power management and improved stability in the stand alone micro grid, as it provides a special advantage of having two more degree of freedom for accurate tuning in comparison with the conventional controller The system performance, particularly the variations in different parameters values are studied properly with different input parameters and loading conditions. Further improvement of stability margin and optimisation of the system parameters have been achieved by the controller, based on Imperialist competitive algorithm. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
9. Reactive Power Compensation in a Stand-alone Wind-diesel-tidal Hybrid System by a Fuzzy Logic Based UPFC.
- Author
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Mohanty, Asit, Viswavandya, Meera, Mohanty, Sthitapragyan, and Mishra, Dillip K.
- Subjects
REACTIVE power ,FUZZY logic ,APPLICATION software ,PID controllers ,COMPUTATIONAL complexity - Abstract
This paper gives a novel idea of application of fuzzy based UPFC controller for Reactive Power compensation in an isolated hybrid system and also discusses the improvement of stability in the hybrid system. For detailed analysis a small signal linear model of the hybrid wind- Diesel- tidal model is considered with different loading conditions. The reactive power compensation and stability analysis have been thoroughly analysed by a UPFC Controller. A fuzzy logic controller is designed to tune the parameters of UPFC controller. Simulation result shows that the system parameters attend steady state value with lesser time and complexities. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
10. Stability analysis and reactive power compensation issue in a microgrid with a DFIG based WECS.
- Author
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Mohanty, Asit, Viswavandya, Meera, Ray, Prakash K., and Patra, Sandipan
- Subjects
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REACTIVE power , *ELECTRIC power distribution grids , *INDUCTION generators , *WIND energy conversion systems , *VOLTAGE regulators , *SIMULATION methods & models - Abstract
This paper presents a novel methodology for compensating reactive power in a microgrid, having a DFIG based wind-diesel system, to enhance the voltage stability of the hybrid system. UPFC as a FACTS device is proposed in order to improve the control of reactive power mismatch and the stability of the system. A small signal model of the wind-diesel system, DFIG based wind turbine system, UPFC and the controllers are designed for the stability analysis. Further, the voltage variation and reactive power compensation is analysed with the incorporation of proposed ANFIS based UPFC controller. Simulations are performed in MATLAB environment for transient stability analysis in a wind-diesel based microgrid with different wind power input and 2% step increase in load demand. Simulation results illustrate the efficiency and effectiveness of the proposed approach and its impact upon transient behaviour of the microgrid. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
11. Transient Stability Analysis in Wind Diesel Hybrid System with Fuzzy-PI Based FACTS Controllers.
- Author
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Mohanty, Asit, Mohanty, Pragyan P., and Mohanty, Sthitapragyan
- Subjects
FUZZY systems ,FLEXIBLE AC transmission systems ,ALTERNATING currents ,ELECTRIC power factor ,ELECTRIC power factor correction - Abstract
The paper presents a comparison study of Transient Stability and Reactive Power Compensation Issues in a Wind Diesel Hybrid System with different FACTS Controllers .A Small signal model of the Hybrid System is taken with the use of Fuzzy Logic based PI Controller to compensate the Reactive power generated in an Isolated Wind Diesel hybrid system. Detailed analysis of the system is undertaken with varying loading conditions. Linearised small signal models of SVC, STATCOM and UPFC are taken to study the transient stability analysis of the proposed system with IEEE type 1 Excitation System. A Self tuned Fuzzy PI Controller is implemented to tune the parameters of K
P and Ki of the Hybrid System which undergoes through Voltage Instability due to sudden change in load. Simulation result shows that the proposed controller attains steady state value with less time. [ABSTRACT FROM AUTHOR]- Published
- 2013
12. Artificial intelligence based forecasting & optimization of solar cell model.
- Author
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Mohanty, Sthitapragyan, Patra, Prashanta Kumar, Mohanty, Asit, Viswavandya, Meera, and Ray, Prakash K.
- Subjects
- *
SOLAR cells , *SOLAR radiation , *ARTIFICIAL intelligence , *REACTIVE power , *PHOTOVOLTAIC cells - Abstract
Abstract This work describes a number of soft-computing based solar forecasting techniques that facilitate the modelling of newly installed solar cell. The solar cell model is developed and validated against measured data. Prediction of solar radiation of a particular location depends upon number of inputs. So selection of most relevant input parameters is an important task for getting good predictions. The input parameters of the model used in this paper are sunshine duration, temperature, humidity where as the clearness index is considered as an output parameter. The magnitude of active current associated with PV inverter has been finalised by the solar based irradiation. The reactive current associated with the PV based inverter is controlled through the optimised solar radiation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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