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Electricity has become vital for day today life. Electricity consumption has enormously increased during the recent past. However it cannot be conveniently stored. Therefore, at every instant of time there should be a sufficient amount of electricity generation to meet the consumer demand. Depending on the demand, power producers adjust their production level. Therefore forecasting electricity demand...
The interest on electric vehicles growing as a sustainable alternative to fossil fuel driven vehicles. Even though there are a number of grid impact studies, only a scant attention has been paid to study the impact of EV charging on system stability. Electrification of transportation brings significant load integration to the grid. This could profoundly influence stability of the grid. Hence, it is...
A new configuration to replace the Thyristor Controlled Reactor (TCR) of a Static VAR Compensator (SVC) by a DC link voltage controlled inductor is proposed in this paper. In this proposed technique, the reactor current contribution is regulated by controlling the peak current through the reactor which conducts for a complete cycle. This is in-contrast with delaying the firing angle to limit the conducting...
The paper presents the development of a DC motor based Wind Turbine Emulator (WTE) and its performance verification through simulation. The torque signal that represents the actual wind turbine with environmental effect was made to generate at the DC motor shaft. Particularly, the study incorporates the turbine power control strategy including the effect of stochastic and deterministic load components...
Dramatic increase in electric energy demand results the power system network to span in a large scale, consequently increasing the possibility of power disturbances, which may lead towards major blackouts. Therefore the power system stability is of prime importance and mainly influencing factors such as rotor angle stability, frequency stability and voltage stability. This paper discusses the overall...
High penetration of wind power is hindered by the variability and uncontrollability of wind power output. Many research publications already proposed solutions using energy storage devices. However due to capital and maintenance cost, real applications of energy storage are limited. Wind turbines employing wound rotor induction generators where either rotor resistance is controlled or a voltage is...
Concerns on worldwide energy security have increased due to many reasons including the price hike of oil followed by coal. Sri Lanka's apprehension for energy security was minimal in the past due to the major share of hydropower in the electricity generation. As Ceylon Electricity Board (CEB), electricity utility in Sri Lanka anticipates a coal-dominant electricity sector within a decade, Sri Lanka...
The paper aims to identify the development of power interconnection network in the Greater Mekong Sub-region (GMS) which is a part of the major energy infrastructure mandated by ASEAN delegates in 1997. An overview of power systems in the region is introduced. The combined load curve for Vietnam and Thailand are formed to show the benefit of power grid interconnection of GMS. The paper also concentrates...
The limitations with regard to the capability of Doubly Fed Induction Generator based wind turbines are discussed. The importance of considering the stability margin when constructing the capability curve was highlighted. Then the total power output vs the reactive power output of the turbine within its capabilities was obtained. A case study was carried out to discuss the capability of a wind farm...
Increasing electrical energy demand, modern lifestyles and energy usage patterns have made the world fully dependant on power systems. This instigated mandatory requirements for the operators to maintain high reliability and stability of the power system grid. However, the power system is a highly nonlinear system, which changes its operations continuously. Therefore, it is very challenging and uneconomical...
This paper reviews and discusses the effects of interconnection transformer configuration on distributed generator (DG) interconnection. Transformer is the key component of the interconnection of DG installation whenever a transformer is required. Further, proper grounding of the transformer and reliable coordination for protection and control are areas that need to be reviewed carefully and applied...
The development plans of a country should be equitably meet developmental and environmental needs of present and future generations. Eradicating of poverty should be considered as an indispensable requirement for sustainable development in order to decrease the disparities in standard of living and better meet the needs of the majority of the people of a country. Hence, Sri Lanka is aimed to electrify...
There are many papers available on doubly fed induction generator (DFIG) and their control. However, there are gray areas where a laymen into the wind industry cannot fully understand with regard to the operation of these machines. This paper presents from first principles, the operation and control of the DFIG, and supplement the theory by results obtained through computer simulations.
The Dynamic Voltage Restorer (DVR) is a commercially available, popular device to eliminate voltage sags and swells in the distribution lines. Its basic function is to inject the voltage difference (difference between the pre-sag and sag voltage) to the power line and maintains the pre-sag voltage condition in the load side. Different control strategies are available depending on the compensation...
Connection of distributed generator (DG) into very weak points of the electricity distribution network is increasing. These connections impose many operational issues and therefore utilities restrict DG connections to the grid. In this study an application of thyristor controlled series compensator (TCSC) to overcome some of these issues are investigated, especially voltage control at the point of...
Increase of electricity demand force the electrical engineers to come up with new solutions. Renewable energy sources, which needs lesser maintenance cost and with lesser environmental effects are gathering momentum. Wind power, major renewable energy source has great potential through out the world. Developing country as Sri Lanka is very much interested in wind power generation and putting effort...
Connection of Distributed Generator (DG) into very weak points of the electricity distribution network is increasing. These connections impose many operational issues and therefore utilities restrict DG connections to the grid. In this study an application of Thyristor Controlled Series Compensator (TCSC) to overcome some of these issues are investigated, especially voltage control at the point of...
Increase of electricity demand force the electrical engineers to come up with new solutions. Renewable energy sources, which needs lesser maintenance cost and with lesser environmental effects are gathering momentum. Wind power, major renewable energy source has great potential through out the world. Developing country as Sri Lanka is very much interested in wind power generation and putting effort...
The connection of new distributed generator (DG) to the existing network increases the fault current and disturbs the existing over current (O/C) protection coordination. The main focus of this study was to investigate the possibility of using a fault current limiter (FCL) to address the above issues. A case study was carried out for a 20 kV distribution network in interactive power system analysis...
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