mairaj mufti - Academia.edu (original) (raw)
Papers by mairaj mufti
International Journal of Power Electronics, 2021
Wind Engineering, 2004
... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isola... more ... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isolated wind-diesel power systems. International Journal of Energy Research, no. 19, pp. 729-740. Das, D., Aditya, SK and Kothari, DP (1999). ...
Wind Engineering, 2004
... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isola... more ... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isolated wind-diesel power systems. International Journal of Energy Research, no. 19, pp. 729-740. Das, D., Aditya, SK and Kothari, DP (1999). ...
Energy storage devices are required for power quality maintenance in stand alone power systems li... more Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration of a redox flow battery system with a typical multi-machine wind-diesel power system for simultaneous voltage and frequency regulation. The redox flow battery is connected to wind park bus through a current controlled voltage source converter based on hysterisis current control. Keeping in view the non-linear and time varying nature of the hybrid wind-diesel-redox flow battery system, neuro-adaptive control is proposed for active/reactive power modulation of the redox flow battery.
This paper proposes some effective self-tuning control strategies for isolated wind-diesel power ... more This paper proposes some effective self-tuning control strategies for isolated wind-diesel power generation systems. Detailed modelling and studies on both single-input single-output (SISO) as well as multi-input multi-output (MIMO) self tuning regulators, applied to a typical system, are reported. Further, the effect of introducing a superconducting magnetic energy storage (SMES) unit on the system performance has been investigated. The MIMO self-tuning regulator controlling the hybrid system and the SMES in a coordinated manner exhibits the best performance
International Journal of Energy Research, 1998
Abstract This paper presents a new scheme for smoothing out the voltage and frequency fluctuation... more Abstract This paper presents a new scheme for smoothing out the voltage and frequency fluctuations simultaneously in a hybrid wind-diesel system using a super conducting magnetic energy storage (SMES) unit. The SMES unit located at induction generators' ...
Wind Engineering, 2008
Energy storage devices are required for power quality maintenance in stand alone power systems li... more Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration ...
Electric Power Systems Research, 2009
This paper investigates the potential of supercapacitor based energy storage system for enhancing... more This paper investigates the potential of supercapacitor based energy storage system for enhancing fault ride through capability of wind driven induction generator. A dynamic model of wind generation system including Static Compensator (STATCOM) is developed. The power control capability of the STATCOM is extended by incorporating supercapacitor based energy storage system. A vector control technique based on the decoupling of real and reactive power is implemented. Simulation results show that fixed speed induction generator achieves significant grid fault withstand capability when aided by supercapacitor based energy storage system. Induction generator regains prefault status immediately after the fault is cleared.
Journal of Power Sources, 2006
In wind-diesel stand-alone power systems, the disturbances like random nature of wind power, turb... more In wind-diesel stand-alone power systems, the disturbances like random nature of wind power, turbulent wind, sudden changes in load demand and the wind park disconnection effect continuously the system voltage and frequency. The satisfactory operation of such a system is not an easy task and the control design has to take in to account all these subtleties. For maintaining the power quality, generally, a short-term energy storage device is used. In this paper, the performance of a wind-diesel system associated with a superconducting magnetic energy storage (SMES) system is studied. The effect of installing SMES at wind park bus/load bus, on the system performance is investigated. To control the exchange of real and reactive powers between the SMES unit and the wind-diesel system, a control strategy based on fuzzy logic is proposed. The dynamic models of the hybrid power system for most common scenarios are developed and the results presented.
Wind Engineering, 2004
A redox flow battery (RFB), as with superconducting magnetic energy storage, has a high speed res... more A redox flow battery (RFB), as with superconducting magnetic energy storage, has a high speed response, and its active and reactive powers can be modulated in the four quadrants of the power chart. This type of rechargeable battery is not aged by frequent charging and ...
Ieej Transactions on Electrical and Electronic Engineering, 2007
This paper presents adaptive neural control of a superconducting magnetic energy storage system (... more This paper presents adaptive neural control of a superconducting magnetic energy storage system (SMES) in a power system for improved load frequency control (LFC). The proposed scheme for SMES control is a new one, tackles the deficiencies in the existing SMES control schemes and is clear about its implementation aspects. The power conversion system (PCS) of SMES used in this paper comprises of a voltage source converter (VSC) and a two-quadrant chopper. The control in each control area is implemented through a neural estimator and a neural controller with both of them operating online. The neural estimator extracts the control area dynamics around an operating point, and the neural controller then generates the power command for the corresponding SMES unit on the basis of a newly introduced variable which is a function of area control error and the change in stored energy in the SMES coil. This feature leads to a suitable and pure adaptive control of SMES. Moreover, in this paper the supplementary controller associated with the automatic generation control (AGC) is made to act on the area control error, with a modified gain setting, which is obtained by the integral square error (ISE) criterion. Simulation studies based on MATLAB are presented on a two-area power system after carrying out the necessary modeling exercise.
Ieej Transactions on Electrical and Electronic Engineering, 2007
This paper presents adaptive neural control of a superconducting magnetic energy storage system (... more This paper presents adaptive neural control of a superconducting magnetic energy storage system (SMES) in a power system for improved load frequency control (LFC). The proposed scheme for SMES control is a new one, tackles the deficiencies in the existing SMES control schemes and is clear about its implementation aspects. The power conversion system (PCS) of SMES used in this paper comprises of a voltage source converter (VSC) and a two-quadrant chopper. The control in each control area is implemented through a neural estimator and a neural controller with both of them operating online. The neural estimator extracts the control area dynamics around an operating point, and the neural controller then generates the power command for the corresponding SMES unit on the basis of a newly introduced variable which is a function of area control error and the change in stored energy in the SMES coil. This feature leads to a suitable and pure adaptive control of SMES. Moreover, in this paper the supplementary controller associated with the automatic generation control (AGC) is made to act on the area control error, with a modified gain setting, which is obtained by the integral square error (ISE) criterion. Simulation studies based on MATLAB are presented on a two-area power system after carrying out the necessary modeling exercise.
International Journal of Energy Research, 2002
This paper presents modelling and control aspects of an isolated wind–diesel system equipped with... more This paper presents modelling and control aspects of an isolated wind–diesel system equipped with a superconducting magnetic energy storage (SMES) unit. The SMES unit is located at the induction generators' terminal bus, for exchanging real and reactive powers in four quadrants, with the wind–diesel system. The system components are modelled by non-linear equations for accurate dynamic performance assessment and the SMES unit is modelled as a controllable current source. The control of the SMES unit is exercised through a multi-input–multi-output (MIMO) self-tuning regulator (STR).The STR uses the local voltage and frequency measurements and generates appropriate signals for the control of the SMES unit. The SMES coil current deviation forms a part of one of the regulated variables of the STR for achieving a continuous control. The complete model of the hybrid system is developed and the parameters of the STR are adjusted for quality improvement of the power supply under turbulent wind. The scheme is then tested for load disturbances. The simulation results show the positive impact of the proposed scheme on the quality of the power supply both under turbulent wind as well as load disturbances. Copyright © 2002 John Wiley & Sons, Ltd.
International Journal of Power Electronics, 2021
Wind Engineering, 2004
... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isola... more ... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isolated wind-diesel power systems. International Journal of Energy Research, no. 19, pp. 729-740. Das, D., Aditya, SK and Kothari, DP (1999). ...
Wind Engineering, 2004
... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isola... more ... 16, pp. 31-42. Bhatti, TS, Al-Ademi, AAF and Bansal, NK (1995). Dynamics and control of isolated wind-diesel power systems. International Journal of Energy Research, no. 19, pp. 729-740. Das, D., Aditya, SK and Kothari, DP (1999). ...
Energy storage devices are required for power quality maintenance in stand alone power systems li... more Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration of a redox flow battery system with a typical multi-machine wind-diesel power system for simultaneous voltage and frequency regulation. The redox flow battery is connected to wind park bus through a current controlled voltage source converter based on hysterisis current control. Keeping in view the non-linear and time varying nature of the hybrid wind-diesel-redox flow battery system, neuro-adaptive control is proposed for active/reactive power modulation of the redox flow battery.
This paper proposes some effective self-tuning control strategies for isolated wind-diesel power ... more This paper proposes some effective self-tuning control strategies for isolated wind-diesel power generation systems. Detailed modelling and studies on both single-input single-output (SISO) as well as multi-input multi-output (MIMO) self tuning regulators, applied to a typical system, are reported. Further, the effect of introducing a superconducting magnetic energy storage (SMES) unit on the system performance has been investigated. The MIMO self-tuning regulator controlling the hybrid system and the SMES in a coordinated manner exhibits the best performance
International Journal of Energy Research, 1998
Abstract This paper presents a new scheme for smoothing out the voltage and frequency fluctuation... more Abstract This paper presents a new scheme for smoothing out the voltage and frequency fluctuations simultaneously in a hybrid wind-diesel system using a super conducting magnetic energy storage (SMES) unit. The SMES unit located at induction generators' ...
Wind Engineering, 2008
Energy storage devices are required for power quality maintenance in stand alone power systems li... more Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration ...
Electric Power Systems Research, 2009
This paper investigates the potential of supercapacitor based energy storage system for enhancing... more This paper investigates the potential of supercapacitor based energy storage system for enhancing fault ride through capability of wind driven induction generator. A dynamic model of wind generation system including Static Compensator (STATCOM) is developed. The power control capability of the STATCOM is extended by incorporating supercapacitor based energy storage system. A vector control technique based on the decoupling of real and reactive power is implemented. Simulation results show that fixed speed induction generator achieves significant grid fault withstand capability when aided by supercapacitor based energy storage system. Induction generator regains prefault status immediately after the fault is cleared.
Journal of Power Sources, 2006
In wind-diesel stand-alone power systems, the disturbances like random nature of wind power, turb... more In wind-diesel stand-alone power systems, the disturbances like random nature of wind power, turbulent wind, sudden changes in load demand and the wind park disconnection effect continuously the system voltage and frequency. The satisfactory operation of such a system is not an easy task and the control design has to take in to account all these subtleties. For maintaining the power quality, generally, a short-term energy storage device is used. In this paper, the performance of a wind-diesel system associated with a superconducting magnetic energy storage (SMES) system is studied. The effect of installing SMES at wind park bus/load bus, on the system performance is investigated. To control the exchange of real and reactive powers between the SMES unit and the wind-diesel system, a control strategy based on fuzzy logic is proposed. The dynamic models of the hybrid power system for most common scenarios are developed and the results presented.
Wind Engineering, 2004
A redox flow battery (RFB), as with superconducting magnetic energy storage, has a high speed res... more A redox flow battery (RFB), as with superconducting magnetic energy storage, has a high speed response, and its active and reactive powers can be modulated in the four quadrants of the power chart. This type of rechargeable battery is not aged by frequent charging and ...
Ieej Transactions on Electrical and Electronic Engineering, 2007
This paper presents adaptive neural control of a superconducting magnetic energy storage system (... more This paper presents adaptive neural control of a superconducting magnetic energy storage system (SMES) in a power system for improved load frequency control (LFC). The proposed scheme for SMES control is a new one, tackles the deficiencies in the existing SMES control schemes and is clear about its implementation aspects. The power conversion system (PCS) of SMES used in this paper comprises of a voltage source converter (VSC) and a two-quadrant chopper. The control in each control area is implemented through a neural estimator and a neural controller with both of them operating online. The neural estimator extracts the control area dynamics around an operating point, and the neural controller then generates the power command for the corresponding SMES unit on the basis of a newly introduced variable which is a function of area control error and the change in stored energy in the SMES coil. This feature leads to a suitable and pure adaptive control of SMES. Moreover, in this paper the supplementary controller associated with the automatic generation control (AGC) is made to act on the area control error, with a modified gain setting, which is obtained by the integral square error (ISE) criterion. Simulation studies based on MATLAB are presented on a two-area power system after carrying out the necessary modeling exercise.
Ieej Transactions on Electrical and Electronic Engineering, 2007
This paper presents adaptive neural control of a superconducting magnetic energy storage system (... more This paper presents adaptive neural control of a superconducting magnetic energy storage system (SMES) in a power system for improved load frequency control (LFC). The proposed scheme for SMES control is a new one, tackles the deficiencies in the existing SMES control schemes and is clear about its implementation aspects. The power conversion system (PCS) of SMES used in this paper comprises of a voltage source converter (VSC) and a two-quadrant chopper. The control in each control area is implemented through a neural estimator and a neural controller with both of them operating online. The neural estimator extracts the control area dynamics around an operating point, and the neural controller then generates the power command for the corresponding SMES unit on the basis of a newly introduced variable which is a function of area control error and the change in stored energy in the SMES coil. This feature leads to a suitable and pure adaptive control of SMES. Moreover, in this paper the supplementary controller associated with the automatic generation control (AGC) is made to act on the area control error, with a modified gain setting, which is obtained by the integral square error (ISE) criterion. Simulation studies based on MATLAB are presented on a two-area power system after carrying out the necessary modeling exercise.
International Journal of Energy Research, 2002
This paper presents modelling and control aspects of an isolated wind–diesel system equipped with... more This paper presents modelling and control aspects of an isolated wind–diesel system equipped with a superconducting magnetic energy storage (SMES) unit. The SMES unit is located at the induction generators' terminal bus, for exchanging real and reactive powers in four quadrants, with the wind–diesel system. The system components are modelled by non-linear equations for accurate dynamic performance assessment and the SMES unit is modelled as a controllable current source. The control of the SMES unit is exercised through a multi-input–multi-output (MIMO) self-tuning regulator (STR).The STR uses the local voltage and frequency measurements and generates appropriate signals for the control of the SMES unit. The SMES coil current deviation forms a part of one of the regulated variables of the STR for achieving a continuous control. The complete model of the hybrid system is developed and the parameters of the STR are adjusted for quality improvement of the power supply under turbulent wind. The scheme is then tested for load disturbances. The simulation results show the positive impact of the proposed scheme on the quality of the power supply both under turbulent wind as well as load disturbances. Copyright © 2002 John Wiley & Sons, Ltd.