9 results on '"Prasad Wadduwage"'
Search Results
2. Reconfigurable solar photovoltaic systems: A review
- Author
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K.A.Himali Lakshika, M.A.Kalhan Sandaru Boralessa, Manoja Kaushali Perera, Darshana Prasad Wadduwage, Vasudevan Saravanan, and K.T.Manjula Udayanga Hemapala
- Subjects
Electrical engineering ,Energy ,Electrical systems reliability ,Renewable energy resources ,Renewable energy ,Micro-grid ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Even though solar power generation has become an emerging trend in the world, its penetration into the utility grid as a distributed generation source is not a satisfactory measure due to the inherent issues related to solar photovoltaic systems (SPVSs). In addressing these issues, microgrids have been identified as suitable integrating platforms for distributed, clean energy resources such as SPV. Different SPV and microgrid architectures are available for different applications depending on the resource availability and controllability. Reconfigurability is a concept that makes a system adaptable to two or more different environments by effectively utilizing the available resources. The review explains the applications of reconfigurable approaches on solar PV systems such as reconfigurable PV arrays, power conditioning unit (DC/DC converter, DC/AC inverter), microgrid controller and topology of distribution network with relevant studies. An analysis is also presented considering the unique features of reconfigurable systems in comparison to the static systems.
- Published
- 2020
- Full Text
- View/download PDF
3. Review on Oscillatory Stability in Power Grids With Renewable Energy Sources: Monitoring, Analysis, and Control Using Synchrophasor Technology
- Author
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Lasantha Meegahapola, Siqi Bu, Darshana Prasad Wadduwage, Xinghuo Yu, and Chi Yung Chung
- Subjects
Computer science ,business.industry ,020208 electrical & electronic engineering ,Control (management) ,Emphasis (telecommunications) ,Control engineering ,02 engineering and technology ,7. Clean energy ,Stability (probability) ,Power (physics) ,Renewable energy ,Electric power system ,Control and Systems Engineering ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business - Abstract
Oscillatory stability has received immense attention in recent years due to the significant increase in power electronic converter (PEC)-interfaced renewable energy sources. Synchrophasor technology offers superior capability to measure and monitor power systems in real time, and power system operators require better understanding of how it can be used to effectively analyze and control oscillations. This article reviews state-of-the-art oscillatory stability monitoring, analysis, and control techniques reported in the published literature based on synchrophasor technology. An updated classification is presented for power system oscillations with a special emphasis on oscillations induced from PEC-interfaced renewable energy generation. Oscillatory stability analysis techniques based on synchrophasor technology are well established in power system engineering, but further research is required to effectively utilize synchrophasor-based oscillatory stability monitoring, analysis, and control techniques to characterize and mitigate PEC-induced oscillations. In particular, emerging big data analytics techniques could be used on synchrophasor data streams to develop oscillatory stability monitoring, analysis, and damping techniques.
- Published
- 2021
4. Hybrid algorithm for rotor angle security assessment in power systems
- Author
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D. Prasad Wadduwage, Udaya D. Annakkage, and Christine Qiong Wu
- Subjects
rotors ,power system security ,power system transients ,Lyapunov methods ,power system stability ,power system faults ,damping ,electric generators ,computational complexity ,rotor angle security assessment ,transient rotor angle stability assessment ,oscillatory rotor angle stability assessment ,dynamic security assessment ,DSA ,power system fault ,Lyapunov exponent concept ,LE concept ,Prony algorithm ,damping ratio ,16-generator 68-bus test system ,50-generator 470-bus test system ,computational burden ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Transient rotor angle stability assessment and oscillatory rotor angle stability assessment subsequent to a contingency are integral components of dynamic security assessment (DSA) in power systems. This study proposes a hybrid algorithm to determine whether the post-fault power system is secure due to both transient rotor angle stability and oscillatory rotor angle stability subsequent to a set of known contingencies. The hybrid algorithm first uses a new security measure developed based on the concept of Lyapunov exponents (LEs) to determine the transient security of the post-fault power system. Later, the transient secure power swing curves are analysed using an improved Prony algorithm which extracts the dominant oscillatory modes and estimates their damping ratios. The damping ratio is a security measure about the oscillatory security of the post-fault power system subsequent to the contingency. The suitability of the proposed hybrid algorithm for DSA in power systems is illustrated using different contingencies of a 16-generator 68-bus test system and a 50-generator 470-bus test system. The accuracy of the stability conclusions and the acceptable computational burden indicate that the proposed hybrid algorithm is suitable for real-time security assessment with respect to both transient rotor angle stability and oscillatory rotor angle stability under multiple contingencies of the power system.
- Published
- 2015
- Full Text
- View/download PDF
5. Reconfigurable solar photovoltaic systems: A review
- Author
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Manoja Kaushali Perera, V. Saravanan, K.A.Himali Lakshika, M. A. Kalhan S. Boralessa, K.T.Manjula Udayanga Hemapala, and Darshana Prasad Wadduwage
- Subjects
0301 basic medicine ,Renewable energy ,Computer science ,Review Article ,Micro-grid ,03 medical and health sciences ,0302 clinical medicine ,Control theory ,Reconfigurable architecture ,Electronic engineering ,lcsh:Social sciences (General) ,lcsh:Science (General) ,Solar power ,Problems related to solar PV ,Multidisciplinary ,Energy ,business.industry ,Photovoltaic system ,Reconfigurability ,Grid ,Renewable energy resources ,Electrical systems reliability ,030104 developmental biology ,Solar PV ,Distributed generation ,Electrical engineering ,lcsh:H1-99 ,Microgrid ,business ,030217 neurology & neurosurgery ,lcsh:Q1-390 - Abstract
Even though solar power generation has become an emerging trend in the world, its penetration into the utility grid as a distributed generation source is not a satisfactory measure due to the inherent issues related to solar photovoltaic systems (SPVSs). In addressing these issues, microgrids have been identified as suitable integrating platforms for distributed, clean energy resources such as SPV. Different SPV and microgrid architectures are available for different applications depending on the resource availability and controllability. Reconfigurability is a concept that makes a system adaptable to two or more different environments by effectively utilizing the available resources. The review explains the applications of reconfigurable approaches on solar PV systems such as reconfigurable PV arrays, power conditioning unit (DC/DC converter, DC/AC inverter), microgrid controller and topology of distribution network with relevant studies. An analysis is also presented considering the unique features of reconfigurable systems in comparison to the static systems., Electrical engineering; Energy; Electrical systems reliability; Renewable energy resources; Renewable energy; Micro-grid; Problems related to solar PV; Reconfigurable architecture; Solar PV.
- Published
- 2020
6. Revisiting the Effects of Supply Voltage Unbalance on the Losses of Three Phase Induction Motors
- Author
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Philip A Commins, U. Jayatunga, Prasad Wadduwage, Jeff Moscorp, Sarath Perera, and Pathum Sudasinghe
- Subjects
Electromagnetics ,Mains electricity ,Computer science ,020209 energy ,020208 electrical & electronic engineering ,02 engineering and technology ,Copper loss ,Finite element method ,Reliability engineering ,Three-phase ,Derating ,0202 electrical engineering, electronic engineering, information engineering ,Induction motor ,Voltage - Abstract
The impact of supply voltage unbalance (VU) on three-phase induction motors (IMs) is well known in terms of extra losses and associated derating to ensure that the motors do not prematurely fail. Theoretical studies, experimental results and standards exist in this regard. However, the approaches taken in the past are not seen be exhaustive now considering the modern tools such as Finite Element Modelling (FEM) software. Also, the relevant documentation available to-date on the subject does not cover the level of variability in the outcomes such as extra losses that can arise when an IM is subjected to the same level of VU that can be produced in a range of different ways. This paper emphasises the importance of Positive Sequence Voltage and the Complex Voltage Unbalance Factor (CVUF) in analysing the losses of a motor under different VU scenarios. Statistical analysis of the losses of three-phase IMs operating under different supply voltage unbalance scenarios is presented in this paper giving special focus to the behaviour of the core loss and copper loss. Two dimensional (2D) FEM is used to model the electromagnetics of the motor and Bertotti core loss model is used to evaluate the core losses. The outcomes of this analysis will be useful in the process of developing improved and cost effective mechanism of derating for mains connected three-phase IMs as well as in their design optimisation.
- Published
- 2018
7. Identification of dominant low‐frequency modes in ring‐down oscillations using multiple Prony models
- Author
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Darshana Prasad Wadduwage, Udaya Annakkage, and Krish Narendra
- Subjects
Engineering ,business.industry ,Oscillation ,Feature extraction ,Sorting ,Energy Engineering and Power Technology ,Low frequency ,Signal ,Electric power system ,Identification (information) ,Control and Systems Engineering ,Control theory ,Feature (computer vision) ,Electrical and Electronic Engineering ,business ,Algorithm - Abstract
This study presents a simple approach to modify the Prony algorithm to extract dominant low-frequency modes present in ring-down oscillations in power systems. The proposed approach is based on the observation that true modes present in the ring-down oscillations appear consistently, irrespective of the order of the Prony model. It is shown that the consistently appearing modes can be extracted using a sorting method. The improved Prony algorithm which has the feature of extracting only the true modes present in the input signal is utilised to propose an oscillation monitoring algorithm in this study. The suitability of the proposed oscillation monitoring algorithm for real-time monitoring of low-frequency inter-area oscillations is demonstrated using synthetic signals and simulated signals of different test systems.
- Published
- 2015
8. A Simulation-Based Procedure to Determine Optimum Range of Settings of Fast Valving Action of Steam Turbines to Enhance Frequency Stability
- Author
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D. G. Rienzie Fernando, K. J. Lakmewan, and D. Prasad Wadduwage
- Subjects
Electric power system ,Computer science ,Steam turbine ,Control theory ,Range (aeronautics) ,Thermal power station ,Transient (oscillation) ,Stability (probability) ,Valve actuator ,Power (physics) - Abstract
Fast Valving (FV) mechanism of steam turbines is considered to be one of the most effective actions for enhancing the security of a power system subsequent to disturbances. It plays a significant role in mitigating the impact of severe disturbances by instantly decreasing steam turbine power, thus ensuring the power system stability. There is a direct relationship between the settings of Over-Speed Protection Control (OPC) unit of steam turbines and the control functions of FV. This paper proposes a generalized simulation-based procedure to determine the optimum intermediate valve actuation timings of the FV control action. A coal-fired thermal power plant has been used as the case study and the accuracy of the settings made using the proposed approach has been demonstrated using actually happened contingencies in a real power system. Finally, it is concluded that the proper selection of actuation timings of intermediate valves for FV scheme has a significant effect on enhancing frequency stability under transient conditions.
- Published
- 2020
9. Hybrid algorithm for rotor angle security assessment in power systems
- Author
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Udaya Annakkage, D. Prasad Wadduwage, and Christine Q. Wu
- Subjects
Damping ratio ,Engineering ,damping ratio ,Stability (learning theory) ,Energy Engineering and Power Technology ,Electric generator ,oscillatory rotor angle stability assessment ,Lyapunov exponent ,computational burden ,dynamic security assessment ,DSA ,law.invention ,Electric power system ,symbols.namesake ,law ,Control theory ,power system stability ,50-generator 470-bus test system ,power system fault ,rotor angle security assessment ,LE concept ,Lyapunov methods ,Prony algorithm ,power system transients ,damping ,computational complexity ,business.industry ,General Engineering ,power system faults ,transient rotor angle stability assessment ,Hybrid algorithm ,Power (physics) ,rotors ,Lyapunov exponent concept ,power system security ,lcsh:TA1-2040 ,symbols ,Transient (oscillation) ,electric generators ,16-generator 68-bus test system ,business ,lcsh:Engineering (General). Civil engineering (General) ,Software - Abstract
Transient rotor angle stability assessment and oscillatory rotor angle stability assessment subsequent to a contingency are integral components of dynamic security assessment (DSA) in power systems. This study proposes a hybrid algorithm to determine whether the post-fault power system is secure due to both transient rotor angle stability and oscillatory rotor angle stability subsequent to a set of known contingencies. The hybrid algorithm first uses a new security measure developed based on the concept of Lyapunov exponents (LEs) to determine the transient security of the post-fault power system. Later, the transient secure power swing curves are analysed using an improved Prony algorithm which extracts the dominant oscillatory modes and estimates their damping ratios. The damping ratio is a security measure about the oscillatory security of the post-fault power system subsequent to the contingency. The suitability of the proposed hybrid algorithm for DSA in power systems is illustrated using different contingencies of a 16-generator 68-bus test system and a 50-generator 470-bus test system. The accuracy of the stability conclusions and the acceptable computational burden indicate that the proposed hybrid algorithm is suitable for real-time security assessment with respect to both transient rotor angle stability and oscillatory rotor angle stability under multiple contingencies of the power system.
- Published
- 2015
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