Results 241 to 250 of about 9,101,005 (318)
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A Precision Audio-Frequency Voltage Regulator
Instrumentation Science & Technology, 1971Abstract : A source of precisely known alternating voltages is described. The output remains constant to within 0.1% for variation of plus or minus 40% in the input voltage (frequencies between 30 Hz and 4 kHz). The principle of operation is based on negative feedback, using a light-emitting diode and photosensitive resistor to control the gain.
Britz, Dieter +2 more
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Optimal Battery Sizing for Frequency Regulation and Energy Arbitrage
IEEE Transactions on Power Delivery, 2021This paper proposes an optimization methodology for sizing and operating battery energy storage systems (BESS) in distribution networks. A BESS optimal operation for both frequency regulation and energy arbitrage, constrained by battery state-of-charge ...
Xuan Wu, Jennifer Zhao, A. Conejo
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IEEE Transactions on Power Systems, 2021
With the increasing integration of PV generation in AC microgrids, it is challenging to keep the stability of system frequency due to the intermittent and stochastic nature of PVs.
Zhongwen Li +6 more
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With the increasing integration of PV generation in AC microgrids, it is challenging to keep the stability of system frequency due to the intermittent and stochastic nature of PVs.
Zhongwen Li +6 more
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Allocation of frequency regulation services
DRPT2000. International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. Proceedings (Cat. No.00EX382), 2002A novel concept for directly quantifying the value of frequency regulation services of individual generators is proposed in this paper. Individual generator dynamics are explicitly incorporated into the optimisation problem as constraints, which allowed the frequency fluctuations to be also directly monitored and controlled. The approach eliminates the
X.P. Zhang +4 more
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Flight frequency regulation and its temporal implications
Transport Policy, 2022In this study, four distinct approaches for flight frequency regulation are investigated with the objective to mitigate network congestion. The approaches differ in the way how a specific number of daily flights on a route is determined: (1) directly regulating the number of flights, (2) defining an average air traffic flow management (ATFM) delay ...
Presto, Felix +3 more
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Frequency Regulation of Power Systems with a Wind Farm by Sliding-Mode-Based Design
IEEE/CAA Journal of Automatica Sinica, 2022Load frequency regulation is an essential auxiliary service used in dealing with the challenge of frequency stability in power systems that utilize an increasing proportion of wind power.
Zhiwen Deng, Chang Xu
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IEEE Transactions on Power Systems, 2022
This paper presents a combined control scheme for the grid-connected energy storage system (ESS). There are two control modes: the power control mode for the charging or discharging condition and the energy control mode for the stand-by condition. In the
Minyuan Guan
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This paper presents a combined control scheme for the grid-connected energy storage system (ESS). There are two control modes: the power control mode for the charging or discharging condition and the energy control mode for the stand-by condition. In the
Minyuan Guan
semanticscholar +1 more source
IEEE Transactions on Emerging Topics in Computational Intelligence, 2021
The high-penetration of distributed generation technologies in the form of MicroGrids (MGs), in recent years, has increased the risk of frequency instability since their energy is supplied by renewable energy resources (RESs) with uncertain nature. Under
M. Khooban, M. Gheisarnejad
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The high-penetration of distributed generation technologies in the form of MicroGrids (MGs), in recent years, has increased the risk of frequency instability since their energy is supplied by renewable energy resources (RESs) with uncertain nature. Under
M. Khooban, M. Gheisarnejad
semanticscholar +1 more source
IEEE Transactions on Power Systems
Frequency regulation scheme of doubly-fed induction generators (DFIGs) are implemented to improve the frequency stability achieving by rotor speed control. However, the coupling dynamics between the maximum power point tracking operation control loop and
Dejian Yang +6 more
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Frequency regulation scheme of doubly-fed induction generators (DFIGs) are implemented to improve the frequency stability achieving by rotor speed control. However, the coupling dynamics between the maximum power point tracking operation control loop and
Dejian Yang +6 more
semanticscholar +1 more source
Frequency modulated switching regulator
1979 IEEE Power Electronics Specialists Conference, 1979A novel switching regulator power supply is described which uses frequency modulation to accomplish duty factor control. The circuit resembles a choke-fed dc-dc converter. A distinguishing feature is that the output transformer is designed purposely to saturate.
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