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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...
With increasing wind power in power systems, impact of wind generators on subsynchronous resonance (SSR) is of interest. Previous research has shown the impact of wind generation on SSR. In this paper, a control strategy is developed utilizing the power converters' control capability in a doubly fed induction generator (DFIG)-based wind turbine system. The control is realized through modulating the...
A methodology based on the security-constrained unit commitment (SCUC) is applied to analyze the transmission congestion in the Eastern Interconnection of the United States for 2008 and 2018. The proposed SCUC tool for this study is referred to as the POwer Market Simulator (POMS). The identified congestions are visualized along with the Geographical Information System (GIS) data and compared with...
This paper discusses modelling of high voltage AC underground cables. For long cables, when crossbonding points are present, not only the coaxial mode of propagation is excited during transient phenomena, but also the intersheath mode. This causes inaccurate simulation results for high frequency studies of crossbonded cables. For the intersheath mode, the correct physical representation of the cables...
This paper presents an optimal tuning of Power System Stabilizers (PSS) for a multi-machine power system using Population-Based Incremental Learning (PBIL) algorithm with adaptive learning rate. The proposed (APBIL) algorithm can adjust the learning rate automatically according to the degree of evolution of the search. The objective of the design is to achieve adequate stability over a wide range...
This paper presents a mathematical model to simulate and analyze electromagnetic transients in transmission lines using a mono-phase representation of these lines comparing results models with and without frequency influence in longitudinal parameters. For this, π circuits and state variables are used for composing a linear system that is solved through iterative numeric routines. This routine is...
Increasing number of wind farms (WFs) connected to power systems calls for efficient aggregate models so that large farms can be represented by only few equivalent wind turbines for steady state and dynamic system studies. A wind power plant consists of many small generators inside a wind farm. Future wind projects predict even greater number of wind turbines inside a wind farm for increased capacity...
Simulation tools for analysis and design of distribution systems with distributed resources (DR) must include modeling capabilities for representing the various DR technologies. Since distribution systems were not designed for the inclusion of DR, most distribution software packages were not designed for the analysis of systems with embedded generation either. Present distribution tools can efficiently...
This paper addresses two critical issues related to the future power engineering education: what to teach and how. While the Smart Grid concepts have been emphasized lately the need to modernize the power engineering education has been well recognized by many for some time. As the Smart Grid emphasis got linked to a substantial funding made available through the American Recovery and Reinvestment...
Service restoration in distribution systems is usually formulated as a multi-objective and multi-constrained optimization problem. In order to improve the performance of Evolutionary Algorithms (EAs) applied in such problem, a new tree encoding, called Node-depth Encoding (NDE), has been successfully applied together with both a conventional EA and a modified version of the Non-Dominated Sorting Genetic...
This paper presents an application of Dynamic Matrix Control (DMC) for controlling steam temperatures in a large-scale once-through boiler-turbine system. In order to control the steam temperatures, we choose a spray and a damper as two controllers. The step response model for the DMC is generated for the two major output variables, superheater and reheater temperatures, by performing step-input tests...
A new procedure for out-of-step protection by mapping the equal area criterion conditions to the time domain is proposed in this paper. The classification between stable and out-of-step swings is done using the accelerating and decelerating energies, which represents the area under the power-time curve. The proposed methodology is simple and overcomes some of the difficulties associated with the previous...
The number of installed distributed generation (DG) in residential areas rapidly increases, specifically in the form of photovoltaics (PV), causing some undesired side effects such as voltage rise. Overvoltage can damage critical loads, but is also disadvantageous for the owner because inverters switch off in case of overvoltage, resulting in output loss. Since grid connected inverters essentially...
Balancing Authorities are responsible for managing their system imbalances including deviations caused by the integration of variable generation resources. As wind and solar penetration levels increase, the challenges of managing power variations also increase. Working independently, balancing areas (BAs) with limited regulation and load following capacity and high wind power penetration would face...
The feasibility and potential benefits of the system-wide Automatic Voltage Control (AVC) in PJM system are studied in this paper. A test AVC system with a hierarchical structure is adopted for simulation study, which is based on eight typical real-time snapshots from the solutions of state estimator in the PJM's Energy Management System (EMS). For each snapshot, the control action simulation is executed...
The ability of the liberalised energy markets to trigger investment in the generation capacity required to maintain an acceptable level of security of supply risk has been - and will continue to be - a topic of much debate. Modelling the dynamics of investment in generation capacity can inform this debate. More precisely, if investment is viewed as a negative feedback control mechanism with energy...
Dish-Stirling solar power generation has emerged as an efficient and reliable source of renewable energy. As the technology moves into commercialization, models become necessary to predict system behavior under various operating conditions. Current literature on dish-Stirling modeling is scattered, focusing on individual components within the system. This paper establishes a background of the individual...
The impact of distributed generation (DG) in a distribution network depends on the design of the protection system and the coordination between the different protective devices. This paper presents the main features of a library of protective devices implemented in an EMTP-type tool for power quality studies in distribution networks with distributed generation. The document discusses the present protection...
This paper presents the use of simulations to study imbalance faults of wind turbines. The dynamics of a model wind turbine are simulated in three different scenarios, i.e., normal operating conditions, blade imbalance, and aerodynamic asymmetry, using TurbSim and FAST. Blade imbalance is simulated by scaling the mass density of one blade which created an uneven distribution of mass with respect to...
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