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The detailed dynamic modeling of pumped storage hydro-plants for system dynamic studies is revisited in this paper. Both rigid and elastic dynamic models for different water tunnel penstock configurations are presented. During the generating mode, the system is modeled following the conventional modeling method for hydro-turbines. During the pumping mode, the system is modeled using the pump head-flow...
The increasing presence of single-phase distributed generators and unbalanced loads in the electric power system may lead to unbalance of the three phase voltages, resulting in increased losses and heating. To decrease this voltage unbalance problem three-phase four-wire inverter-connected distributed generation units may be used. In this paper, the influence of the control strategy of three-phase...
Summary form only given. System planning on a large-scale electric power system is computationally challenging. Network reduction into a small system can significantly reduce the computational expense. The Ward equivalent technique is widely used for the reduction; however, it may not yield the same flow pattern as the original network. In this paper, a new methodology for network reduction is proposed...
In this paper we develop a model of combined heat and power (CHP) dispatch for the system consisting of both thermal generators and wind turbines. In this model, the probability of stochastic wind power is included in the constraint set. This approach avoids the probabilistic infeasibility caused by using the average of random variables. The effects of wind speed on the generated power are investigated...
The interest in the integration of distributed generation into distribution systems has been increased in different countries all over the world as economic and environmental factors drive new technologies to be more efficient and less polluting than their earlier counterparts. As the penetration level of DG increases, the distribution system performance has to be analyzed in details. This work investigates...
Capacity markets have been launched at several ISOs in the US. Many questions arise: Is a capacity market for missing money or reliability? What is a capacity product? How to price the capacity product? These questions are nontrivial and have been discussed in the literature mostly from the economics perspective. This paper attempts to address them from both economics and engineering perspectives...
Summary form only given. Increasing connection of variable distributed generation, like wind power, to distribution networks requires new control strategies to provide greater flexibility and use of existing network assets. Active Network Management (ANM) will play a major role in this but there is a continuing need to demonstrate the benefit in facilitating connection of new generation without the...
In this paper we propose a direct coupling of renewable generation with deferrable demand in order to mitigate the unpredictable and non-controllable fluctuation of renewable power supply. We cast our problem in the form of a stochastic dynamic program and we characterize the value function of the problem in order to develop efficient solution methods. We develop and compare two algorithms for optimally...
This paper focuses on analyzing the impact of electromechanical oscillations caused by distributed synchronous generators on power distribution systems from the power quality point of view. The electromechanical oscillations are natural responses of synchronous generators to a mismatch in their net torques, and thus, are present in every distribution system equipped with such generators. In this work,...
Due to recent changes in electric power system structure and market driven operational changes electric power system operation has increased in its complexity. Engineers and Energy Management System (EMS) suppliers are driven to enhance existing tools and add new tools for control room operators for consistent and faster decisions. Among the two well recognized quality indicators of electric power...
This paper presents field-measurement results of a small 400-W wind turbine generator (WTG) installed on a commercial 9.8-ton fishing boat to achieve the goal of energy saving. The Darrieus-type WTG consisting of three stainless blades, a coreless permanent-magnet generator (PMG), and a maximum-power-point-tracking controller is employed in this study. The output of the wind PMG is connected to the...
Dynamic voltage stability analysis demands a large amount of computing power because of the higher degree of model details and the longer simulated time span. In order to perform voltage stability analysis during operation - so called on-line dynamic voltage stability assessment - and to help the operator with the results to make the right decision, these analyses have to be performed rapidly within...
This paper presents a method for estimating the parameters of dynamic models for induction motor dominating loads. Using particle swarm optimization, the method finds the adequate set of parameters that best fit the sampling data from the measurement for a period of time, minimizing the error of the outputs, active and reactive power demands and satisfying the steady-state error criterion.
Economic, technology and environmental incentives are changing the features of electricity generation and transmission. Centralized power systems are giving way to local scale distributed generations. At present, there is a need to assess the effects of large numbers of distributed generators and short-term storage in Microgrid. To accommodate the high demand of renewable energy and the environment...
Synchronized measurements offer an opportunity for the wide area monitoring of power systems. There is an international trend in installing synchronized measurement devices and attempting to incorporate them in operational practices. This panel addresses international developments and research activities in the installation and use of synchronized measurement devices in power systems. The views of...
This paper describes a method for testing of frequency control capability in island operation. The method and equipment associated with performing the tests are called SolvSim Power Station or SSPS and allows the generating unit to be tested for island operation capability without being disconnected from the grid. It has been used in Sweden for the last decade at over 50 generating units and many...
Functioning, control and safety requirements of nuclear reactors must be well understood and implemented to ensure safety amongst employees and prevent accidents in nuclear power plants. This paper deals with one aspect of pressurised water reactor core control, viz., determination of Boron concentration in the reactor in response to variations in power generation in order to prevent poisoning of...
Detection of manipulated supervisory control and data acquisition (SCADA) data is critically important for the safe and secure operation of modern power systems. In this paper, a methodology of detecting manipulated SCADA data based on state estimation residuals is presented. A framework of the proposed methodology is described. Instead of using original SCADA measurements as the bad data sources,...
Static Synchronous Series Compensator (SSSC) is one of the second generation Flexible AC Transmission System (FACTS) controllers. In this paper, an active damping control strategy for the SSSC is proposed to mitigate subsynchronous resonance (SSR) in the series compensated power system. A multimode controller design method is developed to suppress multiple unstable torsional frequencies separately...
Conventional power systems have been experiencing transition from centralized supply side management to decentralized supply&demand side management due to power system restructuring and addition of distributed generations (DGs) and Smart Grids (SGs) or Smart Distribution Systems (SDSs) with renewable power sources in the past two decades. Therefore load management under the new operating environment...
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