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President Obama called for doubling the share of renewable energy in the nation's supply in three years. California has a renewable energy target of 33% percent by 2030. These bold commitments need transformational strategies to achieve them. Government policies to achieve the ultimate goal of carbon reduction in electric energy systems are to (i) increase renewable penetration, and to (ii) introduce...
The design and implementation of a new control scheme for reactive power compensation, voltage regulation and transient stability enhancement for wind turbines equipped with fixed-speed induction generators in large interconnected power systems is presented. The nonlinear behavior of wind turbines has been represented in this paper by an uncertain term, derived from the Cauchy remainder of the Taylor...
With the emission reduction scheme introduced, increasing number of wind farms have been planned and/or installed in many countries. In this paper, issues with wind power connection to the existing power grid are discussed, with particular emphasize on system operations and planning aspects. In addition to power system analysis, implications of wind power impacts on the electricity market operations...
Most of the power system networks have significant dynamic loads. In this paper, induction motor is considered as a dynamic load which causes voltage stability problems in power systems. This paper presents an analysis to investigate the critical parameters of power systems with dynamic loads for stability studies. To investigate the critical parameters, a single machine infinite bus (SMIB) system...
Cyber security of Supervisory Control And Data Acquisition (SCADA) systems has become very important. SCADA systems are vital for operation and control of critical infrastructures, such as the electrical power system. Therefore, a number of standards and guidelines have been developed to support electric power utilities in their Cyber security efforts. This paper compares different SCADA Cyber security...
The implementation of emission certificates in Europe in 2005 has lead to new uncertainties especially for power companies resulting in additional costs for the power generation. The introduction of certificates goes along with political conditions and objectives particularly in the European Union until 2020. In consequence, these regulations take influence on the power plant scheduling as well as...
Defining and evaluating operational equilibriums in real-time market, constrained by operation risks and economical biddings, is in the center of market operation and its enhancement. For example, in the two-settlement market design, reliability unit commitment is an important stage to bridge day-ahead market with Real-time system operation, which commits additional units to cover forecasted load...
This paper introduces a concept of real-time optimization of hybrid fuel-cell power plants as an alternative distributed generation source that improves the power quality and reliability of the power grid. One of the most important issues of plant operation is the optimal control of the power plant, leading to significant economic and environmental benefits. As a commercialized fuel cell technology,...
Synchrophasor technology was first introduced in 1980s. Since then, many electric utilities such as American Electric Power (AEP), Bonneville Power Administration (BPA), Southern California Edison (SCE), New York Power Authority (NYPA), as well as universities such as Virginia Polytechnic Institute (VPI), have been conducting R&D to explore and advance the application of synchrophasor technology...
Electricity theft is a major problem in developing countries and it has been very difficult for the utility companies to detect and fight against the people responsible for theft. This paper proposes an architectural design of smart meter, external control station, harmonic generator, and filter circuit, which can detect and chastise the appliances of people responsible for electricity theft. The...
An 80 kW `Proof of Concept' generator with 35 pole pair, surface mounted permanent magnet rotor, 60 tooth coils, fractional slot per pole per phase stator, air-cooled, synchronous generator has been built and tested. This paper documents laboratory tests performed in the GE Global Research Europe lab facility. The paper reports about testing and comparison to simulation tools. The main focus of the...
In this paper, a simple and effective strategy is proposed for the coordination of protective devices in typical radial distribution networks embedding distributed generation units. The proposed strategy benefits from microprocessor-based reclosers and directional elements for feeder relays, and addresses the issues of blinding of protection, false tripping, recloserfuse and fuse-fuse miscoordination,...
The combination of extensive cable networks and wind turbine converters has been identified as a potential cause of resonances. A modelling approach for a doubly fed induction generator and a full power converter fed generator for harmonic penetration studies is developed and discussed. An example offshore wind farm is then studied in the simulation package IPSA using the detailed wind turbine generator...
Trico Electric Cooperative Inc (Trico) is a nonprofit cooperative serving more than 38,000 rural customers in southern Arizona. Trico is challenged with managing a distribution system with a wide geographical dispersion. Trico required a system to centralize, control and manage access to all of its substation devices and related data. Trico sought to diversify available substation information and...
The analysis of transient stability plays a vital role in providing secured operating configurations in power systems. In this paper, we present a critical evaluation of several methods for estimating the stability boundary of stable equilibrium points and for assessing transient stability. These methods include the time-domain approach, the controlling UEP method, the hyperplane method and a quadratic...
The subject of the identification of the equivalent circuit parameters of large synchronous generators is revisited. The equivalent circuit of Park is used. On-line measurements are used in a Kalman filter to estimate the machine parameters. The formulation is linear and the extended Kalman filter is not needed. The approach is similar to that of Harley (1992), but flux linkages are not used in the...
This paper presents the results of studies which applies a multi-objective optimization function for the management of a solar based DC spacecraft network of the ring bus topology. The optimization function is utilized which features the objectives of optimizing the utilization of solar energy to continually meet the needs of the network while minimizing battery discharge current and current flows...
A confluence of industry drivers including increased deployment of renewable generation, cost for managing grid peak demands, and capital investments in grid infrastructure for reliability and smart grid initiatives are creating a new interest in electric energy storage systems. This paper will review the role and value of energy storage systems to the electric grid. It will present findings from...
Reliability assessments of electrical power substations have been traditionally performed assuming that the failure and repair processes are stationary and making a great simplification on the protective systems modeling. Thus, in order to improve the level of detail of these assessments, this paper presents a method that combines the modeling of failures and repairs as stochastic point processes...
Approximate loading margin methods have been developed using Artificial Neural Networks (NN) for static voltage stability in power systems. Artificial Neural Network is used to approximate the loading margin at particular generation direction and three different methodologies are used for finding NN training data sets. The proposed methods are validated and compared with actual loading margin and...
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