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In this paper, the development background of electric vehicles and the research status of V2G technology are analyzed, the functions realized in the grid by electric vehicles as mobile distributed energy storage units are set forth, and the economic and technical advantages of which are pointed out. Based on this, analysis to the configuration of a system wherein electric vehicles are connected to...
DG based on wind energy system (WES) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with WES. Firstly, the probabilistic model of...
DG based on Photovoltaic System Generation (PVS) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with PVS. Firstly, the probabilistic...
The distribution power sources and loads are integrated by microgrid technology, which could electively relieve the impacts of distribution power sources on large power grid. So, microgrid is an effective way for distribution power sources' large-scale application. There is unavailability of official release on the microgrid standard as yet at home and abroad, and grid-connected standard should be...
The paper researches the impacts on the voltage of distribution network after grid connected of distributed generation mainly. First, the paper establishes the DG, distribution network and load model, proposes the algorithm of the simplified voltage superposition theorem, and confirms the accuracy of this algorithm. Then according to the varieties of capacity and location and power factor of DG, and...
This paper proposes a new objective function for solving the optimal management of MicroGrid (MG) problem. This objective function aims to minimize MicroGrid's operating cost as well as the emissions of atmospheric pollutants while constraining it to meet the load demands. Some Objective constraints are presented in this paper for the safety of MG system. Moreover, the particle swarm-based-simulated...
The distributed resource energy has been widely used to cope with the higher demand for power quality. The association of different Distributed Generation System (DGS) could cause as many problems as it may solve. The generation and loads could be considered as a micro-grid and separate from the distribution system to isolate the micro-grid's load from the disturbance without harming the distributed...
This paper takes the energy savings as assessment criterion for Combined Heat Cooling and Power System, analyzes the conditions CCHP needs to meet in comparison with dispersed generation. Generating efficiency of cogeneration and the effects thermoelectric ratio has on energy-saving performance are analyzed as top priority.
The functions, tasks and operation flow of energy management system are planned for the supervisory control platform sited in lab microgrid. The mathematical formulation on economical dispatching and optimal operation is presented in detail. The control strategy combined central control and local control is put forward for microgrid operation and validated through the microgrid PSCAD model. The results...
Optimal switching device placement is of vital importance for distribution networks' planning and operation. The combination of distributed generation (DG) and main networks is considered a principle way that could reduce investment outlay, lower the energy depletion and improve reliability of distribution systems. At present, all the study on DG impact on reliability of distribution systems is negative...
Microgrid is an effective form of the DGs (distributed generation) integration on distributed network. Through the coordination by energy storage and control devices, microgrid can restrain the negative influence by the DG output fluctuation on the distributed network and buffer the impact of EV charging load effetely. The harmful effect which EV Chargers bring on the microgrid is their nonlinearity...
The power loss and voltage distribution of distribution network are closely related to the site and size of DG and the load distribution. A new method of DG optimal placement is proposed based on load centroid. The district DG supplied is thought as an irregular shape load block and the load size is thought as quality. The power loss is the least when the DG is installed at the load centroid. The...
This paper presents an improved Newton Raphson load flow algorithm considering distributed generation (DG) based on their control strategies. Different control strategies for various DGs are firstly investigated and the load flow model for direct-driven wind generator is especially mentioned. Then, each kind of DGs, including photovoltaic, wind turbine, fuel cell and microturbine, is assigned a bus...
In this paper, the microgrid which is composed of photovoltaic cells, microturbine, storage device and load is researched. On the basis of analysis of the typical structure of microgrid and the operation modes of every microsource, the program of energy management is presented and designed, and its control strategies are researched under the condition of both grid-connected mode and islanding mode...
Firstly this paper presents the technical aspects of designing a Dynamic Voltage Restorer (DVR) to meet some stringent requirements of voltage sags mitigation for Micro Integrated Power System (MIPS). Secondly through an analysis of configuration of DVR the optimum energy injection scheme is introduced. Thirdly the principles of a control scheme and a protection circuit for mitigating surge current...
This study proposes an islanding detection method for use of grid-connected inverter of distributed renewable generation system. The proposed method is based on two indices: the rate of change of voltage (ROCOV) and the rate of change of frequency (ROCOF). When an inverter is grid-connected, the ROCOV and ROCOF are lower than the threshold values. In contrast, as an islanding occurs, the ROCOV or...
This paper studies service restoration in distribution network with distributed generation (DG). After the occurrence of fault in a distribution network, loads get disconnected and service to the affected loads should be restored through a network reconfiguration procedure. The introduction of DG has great effect on service restoration and network reconfiguration. In this paper, the impact of DG on...
The traditional protection scheme of distribution networks is affected due to the distributed generators connecting to the power system. In order to ensure the protection works correctly, various improved and new schemes have been presented. This paper reviews the development on protection scheme for distribution system containing micro-grid. Meanwhile, the principles and characteristics of these...
In order to solve the problem of service restoration in distribution network based on distributed generation, this paper treated it as a multi-object nonlinear optimization problem with constrains like the type, capacity and priority of important loads. Four possible operation modes are considered in this paper, and loads are classified into three levels. Further, islanding algorithm based on a new...
Solid oxide fuel cells (SOFCs) are modular and flexible in relation to the fuel in use, and have the capability to be used for combined heat and power applications at high efficiency. Due to the advantages, SOFCs are emerging as an attractive energy generation option. As a generation resource, SOFCs could be used as a distributed one connected with a large power system and also could be planted in...
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