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In order to achieve economic and security operation of the grid, an economic structure of self-healing control of grid based of multi-agent system is proposed. Considering the distribution grid of micro-source configuration, load priority, healing speed and economic operation, the economic structure make distribution grid achieve maximize achieve economic operation in the case of ensure reliable operation...
The power grid is changing, new types of generation are increasingly coming on line at both the commercial and consumer scale. As technology improves, energy harvesting, by various means, will force the grid to adapt. Traditional means of control and management may become strained or inadequate for the future grid. The grid is also becoming smarter with increasing interaction between utilities and...
This paper reports on formal behavioral models of power grids with a substantial share of photovoltaic microgeneration. Simulation studies show that the current legislatory framework in Germany can induce frequency oscillations. This phenomenon is indeed recognized by the German Federal Network Agency responsible for overseeing the national power grids, and new regulations are currently being identified...
When electrical transients take place in onsite power system of nuclear power plants, the voltage of safety bus can be affected, as a form of voltage sag, by the transients. The safety buses in nuclear power plants have a role of power supplying to essential loads for safety shutdown of reactor. If voltage sag of the safety bus occurs and impact on the safety features is existed, the risk of nuclear...
In this paper, a plug and play type autonomous-micro-grid system is considered. Multiple distributed generating sources (DGs) and loads interactions are considered pertaining to the stability of the micro-grid. The proposed method enables communication-less operation of each of the elements of the micro-grid system. Master-slave control of the distributed generating sources is considered in a decentralized...
According to the structure characteristic analysis of the shipboard power network, a new analysis method based on the data structure of ‘Tree’ is presented firstly for the shipboard power network. In terms of the features of the shipboard power network, the shipboard power network is divided to two levels as power supplying network and power distribution network. The connected component of the power...
Based on the discuss and the analyse of the domestic and international study of self excitation over voltage and switching over voltage in 1000kV ultra high voltage long distance transmission line, the main point of the study of these problems is proposed . The first point is the precise production condition of the self excitation over voltage. Besides, the possibility of simultaneity and superposition...
This paper presents a conceptual architecture for Micro Grid. The approach utilizes the strategy of control and coordination from Role Autonomous Decentralized System (RoADS) for autonomous operation of a Micro Grid. This architecture aims to optimize the generation production of local distributed generators. Case studies have been performed on a typical low voltage feeder with several distributed...
In this paper, a high frequency (HF)-based three-phase Semicontrolled rectifier-current source inverter system is proposed for grid-connected permanent magnet wind generators. The main advantages of the topology are: high efficiency due to less power losses and reduced number of switching elements, high output power density realization, reduced passive component ratings proportionally to the frequency,...
Financial Transmission Rights (FTRs) are used to hedge congestion risk and they are financed by congestion rents. The ISO may not collect enough congestion rents to cover its obligation to the FTR holders; this is known as revenue inadequacy. Revenue inadequacy may occur even though ISOs run a Simultaneous Feasibility Test (SFT), which ensures revenue adequacy. However, the SFT relies on the assumption...
The power source in micro-grid (MG) is either atmosphere dependent source (e.g. wind generator, solar etc.) or it will be small hydro or diesel turbine. This introduces power quality concerns in MG. It is because of small power number (MW per Hz.) due to limited size of the system and limited resources for system stability. In this paper, a new application of the UPFC is introduced. The slightly modified...
The paper is focused on the new approach to electric power distribution. Following the analogy of telecommunications network and power grids evolution a power packetizing technology is proposed. The new concept of the Packet Power Grid (PPG) is proposed as a set of different power sources and power consumers joined by power lines and electronic switches controlled by a supporting information computer...
This paper describes an integrated model for a Photon Exchange Membrane (PEM) fuel cell generator including the power conditioning devices that can be used as a micro grid. The main focus here is the development of a detailed model of the fuel cell, power conditioning devices and a Voltage Source Inverter (VSI) with no major assumptions. To this end nonlinear models for PEM fuel cell generator, power...
This paper deals with the implementation of a operating microgrid based on current real and emulated energy resources which permits the experimentation of various scenarios. This microgrid is able to adapt to different sorts of energy sources, loads and storage devices, and to critical situations that, with testing and emulation, can improve performances. The microgrid is implemented with real time...
A novel multi-step coordinated control approach for microgrid management is proposed considering economic and environmental aspects. The proposed concept consists of a two-layer control algorithm, the component-layer and the top-layer controls. Both are based on look-ahead multi-step optimization techniques. Assuming the availability of renewable power forecasting methods, future states of the microgrid...
This paper presents the emulation of grid-connected wind energy conversion system based on the 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. This system is composed by a three-phase permanent magnet generator, an AC to DC converter and a single phase Voltage Source Inverter (VSI). The inverter was driven using Space Vector Pulse Width Modulation (SVPWM) at a switching frequency of 18 kHz and...
The dynamic behaviour of a PWM voltage source inverter based voltage generator with an output LC filter is analyzed in this paper. This converter is able to participate to frequency regulation either in connected mode or in an islanded mode with minor modifications in the control algorithm. Thanks to a droop control, it is possible to achieve power sharing between this converter and a classical synchronous...
The utilization of very small hydro power plants has been gaining more and more interest lately. In this context the activation and utilization of the potential energy that is inherent in the drinking water stored in highlevel tanks of waterworks is of growing interest. In the paper at hand, considerations about the modification of a small potable water pipeline for electric power generation are presented...
Offshore wind farms are facing challenges which call for redesigning the electrical drive train of future wind turbines. The turbines are expected to increase in power, and plans for 10-15 MW wind turbines have been reported. Hence will a medium-to high voltage converter solution be highly beneficial. Additionally, a DC-distribution grid is discussed for offshore applications. This indicates that...
In consequence of the generic irregularity of wave energy, it is difficult to envisage the performance of a grid connected wave energy converter without simulations. This paper details a study on directly driven, linear, permanent magnet generator based, wave energy extraction scheme provided with grid-connected three phase neutral point-clamped three level inverter. The linear permanent magnet generator...
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