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Articles 1 - 10 of 10
Full-Text Articles in Engineering
Characterisation Of Large Disturbance Rotor Angle And Voltage Stability In Interconnected Power Networks With Distributed Wind Generation, Lasantha Meegahapola, T Littler
Characterisation Of Large Disturbance Rotor Angle And Voltage Stability In Interconnected Power Networks With Distributed Wind Generation, Lasantha Meegahapola, T Littler
Dr Lasantha G Meegahapola
Wind generation in highly interconnected power networks creates local and centralised stability issues based on their proximity to conventional synchronous generators and load centres. This study examines the large disturbance stability issues (i.e. rotor angle and voltage stability) in power networks with geographically distributed wind resources in the context of a number of dispatch scenarios based on profiles of historical wind generation for a real power network. Stability issues have been analysed using novel stability indices developed from dynamic characteristics of wind generation. The results of this study show that localised stability issues worsen when significant penetration of both conventional …
Capability Constraints To Mitigate Voltage Fluctuations From Dfig Wind Farms When Delivering Ancillary Services To The Network, Lasantha Meegahapola, S Perera
Capability Constraints To Mitigate Voltage Fluctuations From Dfig Wind Farms When Delivering Ancillary Services To The Network, Lasantha Meegahapola, S Perera
Dr Lasantha G Meegahapola
Majority of the wind power resources are typically sited at remote locations in power networks and generated power is transmitted through rural transmission corridors to load centres. With increased penetration level of the wind generation there is an increased requirement to provide ancillary services from distributed wind power resources, hence they are operated under different control strategies to provide ancillary services to the network. The control strategies and capability characteristics will significant impact on voltage fluctuations in distribution networks. This paper presents a comparative analysis between different wind generator control strategies (i.e. power factor control strategy, voltage control strategy and …
Suboptimal Mppt Control For Power Management In Pv-Diesel Remote Area Power Supply Systems, Lasantha Meegahapola, Y J Tan, K M Muttaqi
Suboptimal Mppt Control For Power Management In Pv-Diesel Remote Area Power Supply Systems, Lasantha Meegahapola, Y J Tan, K M Muttaqi
Dr Lasantha G Meegahapola
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 …
Dispatch Strategy To Minimise Uncertainty In Wind Power Generation In The Australian National Electricity Market, Lasantha Meegahapola, Amila Wickramasinghe, A P Agalgaonkar, S Perera
Dispatch Strategy To Minimise Uncertainty In Wind Power Generation In The Australian National Electricity Market, Lasantha Meegahapola, Amila Wickramasinghe, A P Agalgaonkar, S Perera
Dr Lasantha G Meegahapola
With increased penetration of wind power, scheduling generators to meet the forecast demand of a power system is becoming an increasingly challenging task for the system operators. Uncertainty associated with the generation expected from wind plants adds to the load demand uncertainty, making it necessary to retain additional reserves to maintain the balance between demand and supply of power. In the Australian national electricity market (NEM), sophisticated wind forecasting techniques are employed to reduce the uncertainty in wind generation. Despite being able to project the contribution of wind power to a reasonable accuracy, wind power plants are currently not considered …
Characterization Of Gas Turbine Lean Blowout During Frequency Excursions In Power Networks, Lasantha Meegahapola, D Flynn
Characterization Of Gas Turbine Lean Blowout During Frequency Excursions In Power Networks, Lasantha Meegahapola, D Flynn
Dr Lasantha G Meegahapola
While gas turbines are popular in power networks due to reduced emissions and economical operation, their frequency response characteristics are substantially different from other conventional generation technologies; hence, gas turbine dynamics may influence system stability during significant frequency excursions. This study characterizes the impact of gas turbine combustor lean blowout (LBO) while considering large frequency excursions and, in particular, during short-circuit faults. Studies have shown that combined-cycle gas turbines are more vulnerable to an LBO condition during short-circuit events when they operate at rated power output. A sensitivity analysis was also carried out against a number of factors influencing the …
Design Considerations For Inertia Emulating Controllers Used In Variable Speed Wind Turbines, Lasantha Meegahapola, Amila Wickramasinghe, A P Agalgaonkar, S Perera
Design Considerations For Inertia Emulating Controllers Used In Variable Speed Wind Turbines, Lasantha Meegahapola, Amila Wickramasinghe, A P Agalgaonkar, S Perera
Dr Lasantha G Meegahapola
High penetration of wind power into power systems is likely to cause difficulties in maintaining system frequency, as in contrast to conventional synchronous generators, variable speed wind turbines (VSWTs) do not directly contribute to system inertia. To overcome this issue, it has been proposed to emulate inertia by VSWTs by extracting the kinetic energy of the turbine rotor. However, proper designing of the inertia emulating controller is essential for the optimal use of the energy potential and safe operation of the wind turbine. Some of the common controller concepts used for inertia emulation have inherent weaknesses, limiting the frequency support …
Voltage Unbalance Emission Allocation Using Constrained Bus Voltage Method In Radial Distribution Networks, Lasantha Meegahapola, D Perera, S Perera, P Ciufo
Voltage Unbalance Emission Allocation Using Constrained Bus Voltage Method In Radial Distribution Networks, Lasantha Meegahapola, D Perera, S Perera, P Ciufo
Dr Lasantha G Meegahapola
The International Electrotechnical Committee Technical Report IEC 61000-3-13 is focused on the coordination of voltage unbalance (VU) in power systems by prescribing a methodology to determine individual VU emission allocation limits to installations. This paper provides an alternative VU emission allocation process to that of the IEC Technical Report, which is based on the concept of constrained bus voltage (CBV) method. The proposed methodology can be used in relation to radial distribution networks with symmetrical distribution lines. Several application examples of the proposed methodology are presented. It is shown that the proposed methodology is superior in comparison to the VU …
Characterisation Of Gas Turbine Dynamics During Frequency Excursions In Power Networks, Lasantha Meegahapola
Characterisation Of Gas Turbine Dynamics During Frequency Excursions In Power Networks, Lasantha Meegahapola
Dr Lasantha G Meegahapola
Gas turbines inherently depict unique frequency response characteristics compared with other conventional synchronous generation technologies as their active power output is not entirely determined by the governor response during frequency deviations of the power network. Thus, gas turbine dynamics significantly influence on system stability during frequency events in power networks. Power system and power plant operators require improved understanding of the gas turbine characteristics during various frequency events in order to mitigate adverse impact on power system. Therefore a comparative analysis has been performed between combined-cycle gas turbines (CCGTs) and open-cycle gas turbines (OCGTs) in order to characterise the dynamic …
Capability Chart: A New Tool For Grid-Tied Microgrid Operation, Lasantha Meegahapola, A Jayawardena, Duane Robinson, S Perera
Capability Chart: A New Tool For Grid-Tied Microgrid Operation, Lasantha Meegahapola, A Jayawardena, Duane Robinson, S Perera
Dr Lasantha G Meegahapola
Increasing penetration of distributed resources have enabled the development of the microgrid concept. Similar to traditional generators, microgrids can participate in the energy market to achieve technical, economical and environmental benefits. In order to facilitate the participation in energy markets, microgrid operators need to be aware of the full capability of the microgrids. This paper presents a systematic approach for developing a capability chart for a grid-tied microgrid which represents the active and reactive power capability at the grid supply point. Capability charts have been developed for two different microgrids and the impacts of different modelling aspects have been analysed …
Microgrids Of Commercial Buildings: Strategies To Manage Mode Transfer From Grid Connected To Islanded Mode, Lasantha Meegahapola, D Robinson, A Agalgaonkar, S Perera, P Ciufo
Microgrids Of Commercial Buildings: Strategies To Manage Mode Transfer From Grid Connected To Islanded Mode, Lasantha Meegahapola, D Robinson, A Agalgaonkar, S Perera, P Ciufo
Dr Lasantha G Meegahapola
Microgrid systems located within commercial premises are becoming increasingly popular and their dynamic behavior is still uncharted territory in modern power networks. Improved understanding in design and operation is required for the electricity utility and building services design sectors. This paper evaluates the design requirements for a commercial building microgrid system to facilitate seamless mode transition considering an actual commercial building microgrid system. A dynamic simulation model of the proposed microgrid system is established (utilizing DIgSILENT Power Factory) to aid the development of planning and operational philosophy for the practical system. An economic operational criterion is developed for the microgrid …