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This paper presents a toolbox created with the purpose of offering support for power engineering students to better understand the power system steady-state operation and active power flow control using a phase-shifting transformer (PST). The toolbox consists of a graphical user interface (GUI) that allows the user to define scenarios, run the load-flow calculation and select scenarios in order to...
In this paper, we propose a vector control of a doubly fed induction generator (DFIG) for variable speed wind power generation. The model is developed based on the dual powered generator for the control of the active and reactive powers. Several studies are carried out to test their operation under different wind conditions. The results have shown good performances of the wind energy converter system...
The future in electric power supplying is characterized by huge deployment of AC and DC distributed generations (DG). The main requirement was caused by the maximum use of local energy resources in countries with advanced technologies with good cost flows, into the usable energy forms. Huge possibility has especially photovoltaic generation together with accumulation systems or with others local power...
In Grid-Connected PV system should not be limited injecting the active power into the grid. However, it must be able to absorb or to generate sufficient reactive power for a certain amount of time according to the grid demand and maintain the grid voltage. This paper proposes sliding mode control that controls powers respectively the active and the reactive power for a Three-Phase Grid-Connected PV...
Owing to the unprecedented challenges Distribution Network Operators (DNOs) are facing and driven by advances in information and communications technologies, Integrated Distribution Management Systems (IDMS) have been proposed and developed for more improved operation of distribution systems. Voltage and VAr control and Optimization becomes more and more critical in systems with increased operational...
Designing market mechanisms for electricity distribution systems has been a hot topic due to the increased presence of smart loads and distributed energy resources (DERs) in distribution systems. The distribution locational marginal pricing (DLMP) methodology is one of the real-time pricing methods to enable such market mechanisms and provide economic incentives to active market participants. Determining...
Steam turbines can be damaged upon loss of steam flow while the generator remains connected to the power system. Reverse power relays are used to detect the motoring power into the electrical machine and open the generator main breaker to prevent damage from this abnormal operating condition. The motoring power for large steam turbines can be a very small fraction of the power rating, leading to sensitivity...
Congestion management in transmission line is one of the most difficult chores faced by system operator in the rising restructured power system. Congestion in transmission line creates problem for smooth operation in restructured electricity market and increases transmission cost, which leads to profit minimization of the electric power seller and decreases the market efficiency. One of the most effective...
Load shedding is the latest and most expensive operation action in order to prevent the loss of voltage and frequency of electricity networks. In this paper LS (load shedding) is occurred by means of four-step frequency relays and five-step frequency and voltage relays which consider the importance of loads and their priority.
Large renewable power plants connected to the high-voltage network have the potential to make an important contribution to the grid's reactive power management. This is especially true when rather than using a predetermined Q characteristic, the system operator can control the power plant's reactive power output via a direct interface. However, the intermittent nature of the primary resources and...
The voltage control in grids with high intermittent voltage profile, as the distribution grids with renewable energy source, can be based on Indirect Voltage Control (IVC) or Direct Voltage Control (DVC). In the distribution level, there are innumerous issues that influence the voltage profile during the operation of an Intermittent Generator (IG), such as load conditions or system characteristics...
It is possible to carry out activities related to load profiling, energy consumption estimation, planning, taking new investment decisions, managing voltage and energy quality, system efficiency and loss of line with the evaluation of collected data from smart grid. Therefore, it is important to analyze and forecast the smart grid. Energy efficiency in fast-growing countries like Turkey is an important...
Renewable distributed generation systems are an alternative solution to provide energy locally near customers. However, the supplying of power without disturbance is the main challenge for utilities, especially for systems that integrate fluctuating renewable sources which can cause voltage sag and swell. In this paper, voltage sag and swell issues are investigated. The first studied scenario is related...
This paper Treats modeling and control of Wind Energy Conversion System (WECS), based on a five-phase Permanent Magnet Synchronous Generator (PMSG), to ensure an optimum power exchange from the wind turbine, by taking account of the wind speed variations. The system includes a wind turbine, a five-phase Permanent Magnet Generator, two converters, an RL filter, and a DC-link capacitor. The machine...
Domestic installations traditionally were believed to be resistive in nature and did not affect power factor much, if at all. With increasing affordability of air-conditioners, and replacement of electrical geysers with heat pumps, loads are becoming more inductive. Small-scale renewable energy generation through e.g. solar photo-voltaic (PV) panels are becoming more affordable and as such are connected...
In order to consider the uncertainty of DG and loads, the interval number is used to describe the uncertainty of the wind speed and loads. The optimal selection and configuration of distributed generators model is established for distribution systems. The largest investment income for independent power producer of DG is taken as the objective function, and interval power flow is introduced to determine...
Aiming to decrease power loss, it is common to install reactive compensation devices to improve power factor and decrease the loss. As a result of that reactive compensation devices will work in overcompensation state(which means the energy meter works in IV quadrant), problems like increasing wire loss and decreasing voltage may do harm to the safety and stable operation of electrical devices. This...
Traditional power flow algorithm such as the trend for front-and-spoke networks and backward substitution method and a cyclic structure NR method cannot fully reflect the uncertainties affecting the system, and a lot of new energy sources access to change the original properties of the grid, so that a single flow algorithm has significant limitations, the study calculated adapt to the trend of large-scale...
This paper investigates the effects of choosing different values for mean effective pressure, inside cylinders of diesel engine, on engine dimensions at constant values of stroke length to bore diameter ratio in the preliminary design of diesel electric power stations. Five different values of this ratio are chosen ranging from 0.8 to 1.4. Dimensions are found against each value of mean effective...
In the paper, KGMO algorithm is proposed to obtain the optimum settings of reactive power dispatch (RPD) problem to support the voltage profile. Here, multi objectives are used for RPD problem; power loss and total voltage deviation (TVD) minimization. In addition to conventional control parameters for RPD, a FACTS device, namely, SVC has been introduced in power system to bring novelty in reactive...
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