86 research outputs found
A study to determine the emotional effects of basketball, baseball and football on certain junior high school athletes.
Thesis (Ed.M.)--Boston Universit
Assessment indexes for converter p-Q control coupling
This work presents a concise methodology for the calculation of assessment indexes regarding the coupling between active and reactive power control observed on distribution level converters. First, the reader is introduced to the concept of power coupling; when, where and how it appears in power control of converters. A brief summary of the theory and formulation behind it is also included, together with relevant literature. Then, the methodology for the assessment of active and reactive power control performance of any grid-connected converter is presented. The impact of small control disturbances during a testing procedure is monitored, analyzed and converted to meaningful indexes, so that the type and level of coupling is quantified without putting the converter or the grid at risk. The efficiency of the methodology to assess the type and level of coupling is verified experimentally. This is done by assessing several power control approaches with different level of decoupling efficiency on the same power converter connected to a distribution grid. While the assessment is performed with safe, minimal disturbances, its exceptional accuracy is later confirmed by the level and type of coupling observed during significant power step changes
Optimal Power Flow as a Tool for Fault Level Constrained Network Capacity Analysis
The aim of this paper is to present a new method for the allocation of new generation capacity, which takes into account fault level constraints imposed by protection equipment such as switcvhgear. It simulates new generation capacities and connections to other networks using generators with quadratic cost functions. The coefficients of the cost functions express allocation preferences over connection points. The relation between capacity and subtransient reactance of generators is used during the estimation of fault currents. An iterative process allocates new capacity using Optimal Power Flow mechanisms and readjusts capacity to bring fault currents within the specifications of
switchgear. The method was tested on a 12-bus LV meshed network with 3 connection points for new capacity and 1 connection to a HV network. It resulted in significantly higher new generation
capacity than existing first-come-first-served policies
INSPIRE: Evaluation of a Smart-Home System for Infotainment Management and Device Control
This paper gives an overview of the assessment and evaluation methods which
have been used to determine the quality of the INSPIRE smart home system. The
system allows different home appliances to be controlled via speech, and
consists of speech and speaker recognition, speech understanding, dialogue
management, and speech output components. The performance of these components
is first assessed individually, and then the entire system is evaluated in an
interaction experiment with test users. Initial results of the assessment and
evaluation are given, in particular with respect to the transmission channel
impact on speech and speaker recognition, and the assessment of speech output
for different system metaphors.Comment: 4 page
Active distribution networks planning with high penetration of wind power
YesIn this paper, a stochastic method for active distribution networks planning within a distribution market environment considering multi-configuration of wind turbines is proposed. Multi-configuration multi-scenario market-based optimal power flow is used to maximize the social welfare considering uncertainties related to wind speed and load demand and different operational status of wind turbines (multiple-wind turbine configurations). Scenario-based approach is used to model the abovementioned uncertainties. The method evaluates the impact of multiple-wind turbine configurations and active network management schemes on the amount of wind power that can be injected into the grid, the distribution locational marginal prices throughout the network and on the social welfare. The effectiveness of the proposed method is demonstrated with 16-bus UK generic distribution system. It was shown that multi-wind turbine configurations under active network management schemes, including coordinated voltage control and adaptive power factor control, can increase the amount of wind power that can be injected into the grid; therefore, the distribution locational marginal prices reduce throughout the network significantly
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