No abstract

A review of technical challenges in planning and operation of remote area power A review of technical challenges in planning and operation of remote area power supply systems supply systems

, "Enhanced frequency response strategy for PMSG based wind energy conversion system using ultracapacitor in remote area power supply systems," in ndustry Applications Society Annual Meeting, 2015 IEEE, 2015 Enhanced frequency response strategy for PMSG based wind energy conversion system using ultracapacitor in remote area power supply systems AbstractThe high penetration level of wind energy, and non-responsive nature of power electronic interfaced wind energy conversion system (WECS) during frequency variations may create significant stress on conventional generators in a wind-diesel hybrid remote area power supply (RAPS) system. Hence, it is a necessity for WECS to provide frequency support. However, conventional frequency control strategies being used for WECS may impose a severe stress to wind turbines. In this paper, an enhanced frequency response strategy is proposed for the permanent magnet synchronous generator (PMSG) based WECS to regulate RAPS system frequency jointly with its integrated ultracapacitors. The proposed frequency response strategy utilizes the droop control and virtual inertial techniques while suboptimal power point tracking (SOPPT) is implemented in WECS. It can effectively regulate RAPS system frequency while alleviating high rate of change of power (ROCOP) and thus torque stress on both the conventional generators and wind turbines under frequency disturbances. Abstract-The high penetration level of wind energy, and non-responsive nature of power electronic interfaced wind energy conversion system (WECS) during frequency variations may create significant stress on conventional generators in a wind-diesel hybrid remote area power supply (RAPS) system. Hence, it is a necessity for WECS to provide frequency support. However, conventional frequency control strategies being used for WECS may impose a severe stress to wind turbines. In this paper, an enhanced frequency response strategy is proposed for the permanent magnet synchronous generators (PMSG) based WECS to regulate RAPS system frequency jointly with its integrated ultracapacitors. The proposed frequency response strategy utilizes the droop control and virtual inertial techniques while suboptimal power point tracking (SOPPT) is implemented in WECS. It can effectively regulate RAPS system frequency while alleviating high rate of change of power (ROCOP) and thus stress on both the conventional generators and wind turbines under frequency disturbances.

No abstract

, "Enhanced frequency response strategy for PMSG based wind energy conversion system using ultracapacitor in remote area power supply systems," in ndustry Applications Society Annual Meeting, 2015 IEEE, 2015 Enhanced frequency response strategy for PMSG based wind energy conversion system using ultracapacitor in remote area power supply systems AbstractThe high penetration level of wind energy, and non-responsive nature of power electronic interfaced wind energy conversion system (WECS) during frequency variations may create significant stress on conventional generators in a wind-diesel hybrid remote area power supply (RAPS) system. Hence, it is a necessity for WECS to provide frequency support. However, conventional frequency control strategies being used for WECS may impose a severe stress to wind turbines. In this paper, an enhanced frequency response strategy is proposed for the permanent magnet synchronous generator (PMSG) based WECS to regulate RAPS system frequency jointly with its integrated ultracapacitors. The proposed frequency response strategy utilizes the droop control and virtual inertial techniques while suboptimal power point tracking (SOPPT) is implemented in WECS. It can effectively regulate RAPS system frequency while alleviating high rate of change of power (ROCOP) and thus torque stress on both the conventional generators and wind turbines under frequency disturbances. Abstract-The high penetration level of wind energy, and non-responsive nature of power electronic interfaced wind energy conversion system (WECS) during frequency variations may create significant stress on conventional generators in a wind-diesel hybrid remote area power supply (RAPS) system. Hence, it is a necessity for WECS to provide frequency support. However, conventional frequency control strategies being used for WECS may impose a severe stress to wind turbines. In this paper, an enhanced frequency response strategy is proposed for the permanent magnet synchronous generators (PMSG) based WECS to regulate RAPS system frequency jointly with its integrated ultracapacitors. The proposed frequency response strategy utilizes the droop control and virtual inertial techniques while suboptimal power point tracking (SOPPT) is implemented in WECS. It can effectively regulate RAPS system frequency while alleviating high rate of change of power (ROCOP) and thus stress on both the conventional generators and wind turbines under frequency disturbances.

Renewable energy resources are widely being utilised in remote area power supply (RAPS) systems. The capacity value of renewable energy resources in a RAPS system indicates the ability of renewable energy resources to serve the load demand in the RAPS systems. In this paper, the impact of capacity value of renewable resources on energy management of a RAPS system, while maintaining system reliability, is investigated. It is revealed that capacity value of renewable energy resources has direct influence on RAPS system energy management. By utilising storage in conjunction with renewable energy resources, the RAPS system can cater load demand while achieving a higher reliability. A case study based on a remote village has shown that with the presence of a renewable energy resource with high capacity value can meet the load demand with a relatively small storage system for energy balance while maintaining the level of reliability target. Therefore, it is imperative to consider capacity value of renewable energy resources to design a highly reliable RAPS system.

Maximum power point tracking (MPPT) is commonly being used in solar-photovoltaic (PV) power generation systems to maximise solar energy extraction. In this paper it is proposed to operate the solar-PV system at the suboptimal MPPT to manage power balance in a remote area power supply (RAPS) system. This is performed based on three different operating modes: 1) Frequency control mode; 2) Active power control mode; 3) MPPT control mode. The operating modes are decided based on the load level and the operating mode of the diesel generator (i.e. synchronous condenser mode or generator mode). This power management strategy balances the generation and load demand that requires transition between the three operating modes without using the dummy load. The proposed strategy is capable of extending the diesel generator life time and improves the operating efficiency of the diesel generator. Simulation studies are carried out to validate the effectiveness of the suboptimal MPPT control strategy in a PV-Diesel RAPS system, and have shown that the proposed strategy can seamlessly maintain power balance in the RAPS system while maintaining the voltage and frequency within stipulated limits. Substantial cost savings can also be achieved in long run due to the life time extension and efficiency improvement of the diesel generator. Abstract-Maximum power point tracking (MPPT) is commonly being used in solar-photovoltaic (PV) power generation systems to maximise solar energy extraction. In this paper it is proposed to operate the solar-PV system at the suboptimal MPPT to manage power balance in a remote area power supply (RAPS) system. This is performed based on three different operating modes: 1) Frequency control mode; 2) Active power control mode; 3) MPPT control mode. The operating modes are decided based on the load level and the operating mode of the diesel generator (i.e. synchronous condenser mode or generator mode). This power management strategy balances the generation and load demand that requires transition between the three operating modes without using the dummy load. The proposed strategy is capable of extending the diesel generator life time and improves the operating efficiency of the diesel generator. Simulation studies are carried out to validate the effectiveness of the suboptimal MPPT control strategy in a PV-Diesel RAPS system, and have shown that the proposed strategy can seamlessly maintain power balance in the RAPS system while maintaining the voltage and frequency within stipulated limits. Substantial cost savings can also be achieved in long run due to the life time extension and efficiency improvement of the diesel generator.Index Terms-Diesel generator, frequency control, maximum power point tracking (MPPT), photovotaic (PV), power management, remote area power supply (RAPS) system, voltage control.

power control of DFIG based wind turbine based on wind speed estimation and particle swarm optimization," in Power Engineering Conference (AUPEC), 2015 Australasian Universities, 2015, pp. 1-6.Direct power control of DFIG based wind turbine based on wind speed estimation and particle swarm optimization Abstract This paper presents a direct power control (DPC) design of a grid connected doubly fed induction generator (DFIG) based wind turbine system in order to track maximum absorbable power in different wind speeds. A generalized regression neural network (GRNN) is used to estimate wind speed and thereby the maximum absorbable power is determined online as a function of wind speed. Finally the proposed DPC strategy employs a nonlinear robust sliding mode control (SMC) scheme to calculate the required rotor control voltage directly. The concept of sliding mode control is incorporated into particle swarm optimization (PSO) to determine inertial weights. The new DPC based on SMC-PSO scheme has acceptable harmonic spectra of stator current by using space vector modulation (SVM) block with constant switching frequency. Simulation results on 660-kw grid-connected DFIG are provided and show the effectiveness of the new technique, for tracking maximum power in presence machine parameters variation.