Kithsiri Liyanage

University of Peradeniya | UOP · Department of Electrical and Electronic Engineering

Net-load variability and uncertainty in high renewable penetration networks have imposed new challenges to the system operators; adequate ramping, restart, and wider frequency and voltage operation capabilities provided by responsive resources are required to preserve acceptable service quality. Flexibility indicators and resource requirement const...

The different types of EVs, their operating modes and V2G operation are discussed. The characteristics of EVs and their key elements are presented. The benefits of V2G operation to smart grid operation are discussed and relevant standards are briefly introduced. Further, battery energy Technologies and Power Electronic technologies that are used in...

NIST, in its Conceptual Model for the Smart Grid, has divided the entire Smart Grid operations into seven subdomains. The Customer Domain plays an important role in Demand Response (DR) programs. To take part in DR programs, the Customer domain should be equipped with a Home Area Network. Communications within the Home Area Network should be accomp...

Smart Grid is divided into seven sub domains by NIST. The customer domain refers to the end users of electricity. In addition to the traditional role of consumer, they will also participate in generation as well as storage of energy. They would respond to signals coming from the grid and reduce or increase consumption and/or generation accordingly....

Smart Grid is expected to improve the reliability and efficiency while reducing the carbon footprint of energy sector. The incorporation of renewable generations at customer premises is a viable method to increase the renewable component of generation in Smart Grid. However, the random and intermittent nature of power generation is an inherent chal...

Growth in installed photovoltaic (PV) systems in the past decade has increased and the trend will continue. Different types of photovoltaic panels are available for purchase in the market with different specifications by different manufactures. It would be very costly to buy different types of PV panels for PV system testing at the research level o...

Growth in installed photovoltaic (PV) systems in the past decade has increased and the trend will continue. Different types of photovoltaic panels are available for purchase in the market with different specifications by different manufactures. It would be very costly to buy different types of PV panels for PV system testing at the research le...

Though GPRS is no longer used in typical multimedia applications, they are being extensively utilized in remote monitoring and control application due to their high reliability and relatively low cost. However the delay characteristics of lower layers of GPRS system play major role in its overall performance. In literature it is proved through Simu...

Partial shading, which directly affects the payback period and efficiency, cannot be avoided completely in domestic integrated photovoltaic (PV) arrays. Up-to-date economic analysis under partially shaded conditions is not reported in detailed in the literature. In this paper a techno-economic analysis was carried out to demonstrate how the selecti...

Non-conventional renewable energy sources like wind and solar PV are expected to reduce the carbon footprint of the electric energy sector. But the inherent intermittent and random nature of these sources could disturb the stability of the power system. Even though the power fluctuations could be arrested using large Battery Energy Storage System (...

Cell balancing is vital for ensuring the safety and life of batteries. Due to temperature and current variations in different cells can lead to cell imbalance. Among the approaches available for cell balancing, dissipative cell balancing is less efficient due to inherent losses associated with the balancing strategy. Though non-dissipative balancin...

Non-conventional distributed renewable energy sources like wind and solar are increasingly becoming popular world over. A significant amount of these energy sources are expected to be connected to the distribution network due to their low spatial density. But the intermittent and random nature of these sources challenges the stability of the networ...

A Squid proxy sever is a popular web content caching service trusted by many network administrators. In this paper, we describe a method of managing the bandwidth of Squid proxy cache through the World Wide Web, thus allowing Squid administrators and authorized users to allocate a percentage of bandwidth to a particular computer or group of compute...

To integrate large scale renewable energy sources in the power grid, the battery energy storage performs an important role for smoothing their natural intermittency and ensuring grid-wide frequency stability. Electric vehicles have not only large introduction potential but also much available time for control because they are almost plugged in the...

Electric power systems worldwide face radical transformation with the need to decarbonise electricity supply, replace ageing assets and harness new information and communication technologies (ICT). The Smart Grid uses advanced ICT to control next generation power systems reliably and efficiently. This authoritative guide demonstrates the importance...

IntroductionDedicated and shared communication channelsSwitching techniquesCommunication channelsLayered architecture and protocolsReferences

With the introduction of smart grid, the conventional power grid is envisioned to undergo an evolution by incorporating advance functionality to the power grid through the addition of digital technologies like Advance Metering Infrastructure, communication infrastructure and novel control strategies and algorithms. However due to the high level of...

The integration of small scale solar & wind generation into distribution networks could cause power fluctuations due to the intermittent & random nature of these sources. This could become one of the significant concern in future power system operator. Though the development of Battery Energy Storage Systems (BESS) can address effectively the afore...

Recently, photovoltaic generation (PV) has attracted a great attention as one of green power generations. Accordingly a large amount of PV systems will be installed in residential areas in the coming years. In such scenario, reverse power flow caused by PV in feeders may cause some problems such as voltage rise over upper limits in the distribution...

This paper propose an autonomous distributed vehicle-to-grid control scheme of grid-connected (plug-in hybrid) electric vehicle. Grid-friendly charge and discharge maintaining user convenience for plug-out and battery state-of-charge is realized based on frequency measurement at the plug-in terminal. Implementing proposed scheme to automotive power...

Penetrating large amount of renewable energy sources into power system, battery energy storage performs an important role for smoothing their natural intermittency, ensuring grid-wide frequency stability, and suppressing voltage rise caused by reverse power flow. The ubiquitous power grid is one of the concepts as a smart grid in Japanese context,...

The trend of integrating renewable energy sources into power networks is becoming common in practice, making power systems to be more ubiquitous in nature. The connection of renewable sources in large numbers at distribution level could cause adverse power fluctuations. By employing battery energy storage systems, these fluctuations can be reduced....

Integration of large scale renewable energy sources into power grid, battery energy storage performs an important role for smoothing their natural intermittency and ensuring grid-wide frequency stability. Plug-in hybrid electric vehicle and electric vehicle have potential of alternative of the battery because of its high performance lithiumion batt...

The power outputs of non-conventional renewable sources are random and intermittent in nature. The integration of such sources in large numbers into existing power networks in the future could make the reliable and stable operation of power systems highly challenging. In this paper, the performance of a method based on balancing active power near r...

Penetrating large amount of renewable energy sources into power system, battery energy storage performs an important role for smoothing their natural intermittency, ensuring grid-wide frequency stability, and suppressing voltage rise caused by reverse power flow. The ubiquitous power grid concept has been proposed as a smart grid in Japanese contex...

Penetrating large amount of renewable energy sources into power system, battery energy storage performs an important role for smoothing their natural intermittency, ensuring grid-wide frequency stability, and suppressing voltage rise caused by reverse power flow. The ubiquitous power grid is one of the concepts as a smart grid in Japanese context,...

Within a carbon constrained world, the proportion of generation from nonconventional renewable energy sources in the generation mix of power systems, is expected to increase substantially. The generation from renewable sources, connected to power networks mostly at distribution level, will change the traditional power flow patterns and produce adve...

Within the carbon constrained world, virtually unrestricted integration of renewable energy sources into power networks is expected to become common in practice, making power systems to be more ubiquitous[1] in nature, structurally and operationally. Consequently, handling the intermittent and random behavior of renewable generation, thus Load Freq...

Penetrating large amount of renewable energy resources into power system, battery energy storage system perform important role for smoothing their natural variability, ensuring grid-wide frequency stability, and suppressing voltage rise caused by reverse power flow. The ubiquitous power grid concept has been proposed as a Japanese smart grid, in wh...

This paper is a survey of existing intelligent system applications to automation of major distribution functions. The intelligent system techniques included in this survey are expert systems, neural networks, fuzzy logic, heuristic search, and genetic algorithms. Their potential for future applications is discussed

Construction of dynamic equivalents plays an important role in the effort to reduce the computational burden of the power system stability studies. There are various approaches for the construction of power system dynamic equivalents. Among them, coherency based equivalents attracted the attention of power engineers due to it's accuracy and the sim...

Transient stability analysis is one of the most important studies related to power systems. As the scale of the power system grows, the computational effort required for this analysis increases greatly. Use of equivalents to represent certain parts of the system is a popular approach to overcome the above difficulty. Coherency based equivalents req...

Construction of dynamic equivalents plays an important role in the effort to reduce the computational burden of the transient stability analysis of power systems. Coherency based one is an attractive dynamic equivalent for power systems. In this paper, the authors propose a new efficient practical algorithm for the identification of coherent machin...