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Integration of Plug-in Electric Vehicles (PEVs) and renewables poses substantial challenges in electricity distribution networks. This paper investigates the impact of large-scale PEV penetration in distribution networks, when also considering the integration of other renewable energy resources, e.g., wind, hydropower and Photovoltaics (PVs). As such, analysis on an existing low voltage local power...
The increase in energy production from non-programmable renewable sources has radically altered the production scenarios, bringing undeniable environmental benefits but also some criticalities for the power networks. One of the most impacting issues is network inertia decrease. Currently wind and photovoltaic generators do not contribute to system inertia, reducing system stability in case of power...
Wind power installed capacity is expected to reach 1,000 MW and 6,200 MW in the Vietnam Power System (VPS) in 2020 and 2030, respectively. But detailed dynamic analysis of the wind power plants' (WPPs) integration into the VPS is still scarce. In this paper, first, the impact of WPPs' integration on the dynamic voltage performance and the wind turbine generator (WTG) low-voltage-ride-through (LVRT)...
This paper proposes an application of a hierarchical automatic voltage regulation scheme for wind power plants connected to HV networks. The proposed control schemes is based on a given topology of wind power plants. In particular, we assume that wind generators are connected to each other and have a unique point of contact at the HV level. The secondary voltage control scheme proposed in the paper...
Power quality standards exist to guide the interconnection requirements of large wind and solar plants. IEEE guidelines exist for flicker and harmonics, while IEC guidelines exist for the measurement criteria of power quality phenomena and the characterization of wind turbine equipment. There are also some uniform guidelines for low voltage ride through (LVRT) of large plants. The presentation gives...
Accurate representation of wind power plants (WPP) in both offline and online power system stability studies has gained importance because of the rapid increase in installation of wind generation around the world. However, because increases in accuracy reduce computational efficiency, reduced WPP representation is preferred. To improve accuracy of the reduced WPP model, other authors have proposed...
In this paper, the control strategy to improve voltage stability of power system was studied after large scale wind power plants integrated. And the strategies to improve the transient voltage stability of wind power plants were introduced firstly. Based on the analysis of characteristics that voltage stability of the fix speed wind generator, a new control strategy that can improve the voltage stability...
The main parameters governing wind power economics include: investment costs; operation and maintenance costs; turbine lifetime, electricity production/average wind speed, etc. Mature wind power plant (WPP) infrastructures still require a large investment for to maintain and manage these infrastructures effectively. The aim of this paper is to identify the matters from maintenance in WPP areas and...
This paper presents a system using a supercapacitor storage device to smoothen the output power fluctuation of a variable-speed wind generator. This kind of system is a multiconverter structure and exhibits nonlinear behavior. In this paper, a nonlinear control algorithm based on the flatness properties of the system is proposed. Utilizing the flatness principle, we propose simple solutions to the...
Wind power is developing rapidly all around the world and at present total installed capacity is about 120,000 MW. Due to continuous improvements in turbine efficiency and increasing fuel prices, wind power is becoming economically competitive compared to conventional power generation. Combined economic/emission dispatch (CEED) involves the simultaneous optimization of two conflicting objectives namely...
This paper presents an improved algorithm for transmission expansion planning based on ant colony optimization, which is a heuristic optimization method showing several advantages compared to traditional methods. A grid model for the Nordic Area, Great Britain and a combination of both are used to show the performance of the optimization process. The focus of the work is to develop a tool for transmission...
This paper presents a novel voltage stability sensitivity index incorporating the slip of wind generator and stochastic wind speed and load. Tradition studies are insufficient to inquire the impact of the slip of asynchronous wind generators and stochastic wind speed and load on voltage stability index. Firstly, the slip of asynchronous generator is introduced as a new state variable, and thus new...
Wind power generation systems influence power quality in a very specific manner creating the requirements for detailed and correct analysis of disturbances caused by wind generators. Wind power system cause sub- and interharmonic disturbances within the spectrum of voltages and currents. The paper shows alternative method of spectrum estimation in power systems, tested on the system with the doubly...
This paper analyzed the structure of a direct-drive wind power generation, The mathematical model of the wind power generation system is complex, strongly affected by the varying parameter and exterior disturbing, and has the features of nonlinear, time changing and coupling. According to the above characteristics, the fuzzy-logic control is introduced into the wind power system. By using the fuzzy...
Sustainable energy resources, particularly wind power, are rapidly becoming generation technologies of significance around the world. A multi-objective generation dispatch problem that considers environment and fuel cost under substantial penetration of wind energy is proposed in this paper. The nonlinear characteristics of thermal units and their operational constraints, such as generation limitations,...
The most important parameter in estimations and calculations of technical adequacy of wind park (WP) connection is short-circuit power in the Point of Common Connection (PCC). Design and planning of wind park substations can be important factor in fulfillment of transmission or distribution system operator (TSO, DSO) grid code. Likewise, selection of high-voltage equipment such as power transformer,...
As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
The minimization of power losses in the medium voltage (MV) grid requires adjustment of network of power sources. This problem is particularly important for renewable energy sources, for example for the farms of wind generators. Their placement and nominal power should be selected according to the configuration of the network and the largest loads. The implementation of the genetic algorithm (GA)...
The paper presents investigations of a genetic algorithm for computations of power losses in the MV power grid. In this case, the vector of start population PO0 and mutation likelihood was investigated. Diagrams of power losses in the grid dependent on the value of the mutation operator as well as the vector size of start population p are presented. The construction of the parallel genetic algorithm...
This paper explains a method to calculate the capacitance value of a 3-Ø cage induction motor working as a generator in the self-excited mode of operation. The synchronous impedance test method has been reviewed. The capacitance value is determined from the manufacturer data. The effect of voltage variation with different capacitances has been evaluated at constant speed. Performance of self-excited...
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