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As renewable electricity generation is increasing, several concerns are addressed by the Transmission System Operators (TSO) towards the management and the security of the electrical grid. This paper reviews solutions to ease the integration of renewable energy in the electrical systems through enhanced supervision of renewable generation as well as utilisation of short term or medium term storage...
In recent years, penetration of wind generated electricity into power grids has been increasing significantly. During the last few decades, wind energy has doubled in capacity every three years. Because of the intermittent characteristics of wind power, it is usually difficult to determine an acceptable penetration level to maintain specific reliability requirements. The need for better capacity credit...
An optimal preventive generator maintenance scheduling (GMS) in a smart grid environment comprising wind-hydrothermal energy resources is presented in this paper. GMS problem is solved with the aim of maximizing economic benefits subject to satisfying system constraints. This GMS formulation becomes a challenging problem because of the variability and intermittency of wind speed and the incorporation...
With the development of wind power, the inherent characteristics of randomness and uncertainty of wind energy would have an impressive effect on power system frequency, it is necessary for wind farm to participate in frequency regulating in order to share the burden with the frequency-regulating power plants, and to improve power system stability. Two operation modes of the wind farm are proposed...
The use of energy storage integrated with wind power is commonly considered in a system for increased operational flexibility. In past years, a fast growth in development of wind generation has been experienced in power system, due to many factors including environment and depletion of fossil fuel resources. With increasing installed wind capacity, the intermittency issues must be addressed. One way...
The characteristics of large wind farm were analyzed and several feasible dispatching methods were broached when large wind farm integrates into power grid. By simulating and comparing, a new real-time dispatching method was proposed. Wind farm should reserve some of its generation capacity according to the forecast of maximum power to be captured, which makes it have the ability to regulate primary...
The integration of wind resources into power systems entails new challenges at all levels of the electricity industry. In this paper, we discuss critical issues emerging due to the incorporation of wind power suppliers in existing electricity market designs. We discuss the impacts of wind power intermittency and uncertainty on the planning and operation of the system and markets. In particular, we...
This paper concerns frequency regulation performance in power systems with a high level of wind generation penetration. As wind generation becomes a significant portion of total energy production, wind power variability will cause system frequency to deviate from nominal value. Short-term wind power fluctuations are characterized by frequency spectra. This information is used together with robust...
Wind power has been considered as an environmental friendly electrical generation resource; however, the high wind power penetration can lead to high-risk levels in power system reliability. Energy storage system (ESS) is a promising means to smooth variations of wind power and improve the system reliability. Simulation models for assessing generation adequacies of power systems with wind power generation...
In order to maximize capture wind power, wind turbine generator needs to tune wind turbine speed according wind. It is difficult to obtain the better dynamic quality and robustness by conventional controller based on mathematic model due to uncertainty of wind speed and wind direction. An integral variable structure fuzzy adaptive controller is proposed for variable speed wind power system with uncertain...
Renewable energy sources are becoming more and more important for power systems. With increasing sizes and a mandate to operate as financial entities seeking to maximize benefits in an electricity market, power systems require highly effective planning tools. In this paper, an optimal capacitor planning method based on optimal power flow is proposed for a power system with wind generators and PV arrays...
New and renewable energy sources are being explored and utilized due to the rise of environmental concerns and progressive extinction of traditional fossil energy sources. Wind power generation is one of such sources and is extensively integrated in the existing power systems. Development of better wind-thermal coordination algorithm is necessary to determine the optimal proportion of wind and thermal...
Wind power generation as one of the most popular renewable energy applications is absorbing more and more attention all over the world. However, output power fluctuations of wind farm due to random variations of wind speed can cause network frequency and voltage flicker in power systems. The power quality consequently declines, particularly in an isolated power system such as the power system in a...
As wind turbine output is proportional to the cubic of wind speed, the wind turbine generator output fluctuates due to wind speed variations. Hence, if the power capacity of wind power generators becomes large, wind power generator output can have an influence on the power system frequency. Since Superconducting Magnetic Energy Storage (SMES) system has the ability to provide both active and reactive...
This paper addresses the problem of frequency stability in an autonomous wind-diesel power system with energy storage. At high wind penetration levels and due to the lack of controlled rotating machines, wind fluctuation might cause unacceptable frequency excursions in the system and they need to be mitigated. A virtual synchronous machine control is designed to emulate a virtual inertia via power...
One of the major concerns for the stability of power systems including large amount of wind turbine generators is how to improve the Low-Voltage Ride-Through (LVRT) capability of wind turbine generators during voltage dip occurring in power networks. In order to achieve LVRT improvement, this paper proposes a new method of pitch angle control for induction-generator-type of wind turbine. If the turbine...
This paper describes a method to enhance the load frequency control in a power system with distributed generations (DG). In this paper, a power storage system is used with photovoltaic generation and wind power generation. The microgrid system at Aichi Institute of Technology in Japan is used as a simulation model. For each simulation, which was carried out by using a power transmission simulator,...
This study provides valuable evaluations and recommendations for the interconnection of large wind projects to a major power grid. Focusing on the intermittent nature of the wind power, a Monte Carlo method has been included in the power market simulation. By performing a dispatch for each hour, the expected behavior of generating resources in the market under a variety of conditions can be studied...
Nowadays, the implementation of environmentally-friendly and uncontrollable primary energy sources in the electrical power system production is increasing, introducing abatement in generation dispatchability. The incorporation of high levels of small-scale non-dispatchable distributed generation leads to the transition from the traditional 'vertical' power system structure to a 'horizontally-operated'...
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