• Title/Summary/Keyword: Primary frequency control

Search Result 260, Processing Time 0.024 seconds

Effective Capacity Calculation of the Electrical Energy Storage providing the Primary Frequency Control Service based on the Contribution to the Frequency Response of Power Systems (전력계통 주파수응답 기여도 기반의 전기저장장치 주파수추종서비스 유효용량 산정)

  • Lim, Hyeon Ok;Choi, Woo Yeong;Gwon, Han Na;Kook, Kyung Soo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.11
    • /
    • pp.1561-1567
    • /
    • 2017
  • This paper calculates the effective capacity of EES providing the primary frequency control service based on its contribution to the frequency response of the power system. The amount of governor response from conventional generators which can be replaced by the primary frequency control from EES keeping the frequency response of the power system is defined as the effective capacity. The proposed method for calculating the effective capacity of EES is verified through case studies employing Korean power system. Furthermore, the application of the effective capacity of EES to power system operation is also discussed.

Lessons Learned from Energy Storage System Demonstrations for Primary Frequency Control

  • Yu, Kwang-myung;Choi, In-kyu;Woo, Joo-hee
    • KEPCO Journal on Electric Power and Energy
    • /
    • v.4 no.2
    • /
    • pp.107-114
    • /
    • 2018
  • In recent years, ESS (Energy Storage System) has been widely used in various parts of a power system. Especially, due to its fast response time and high ramp rate, ESS is known to play an important role in regulating grid frequency and providing rotational inertia. As the number of installed and commercially operating ESSs increases, the reliability becomes an important issue. This paper introduces control schemes and presents its test method for grid-connected ESS for primary frequency regulation. The test method allows to verify the control operation in the individual operation mode and state. A validation of the method through actual ESS test in a electrical substation is presented in the case study section.

Control Valve Positioner and Its effect on a Gas Turbine MW Control (공정제어루프 최종 조작부의 동작특성에 관한 연구)

  • Kim, Jong-An;Shin, Yoon-Oh
    • Proceedings of the KIEE Conference
    • /
    • 1998.07b
    • /
    • pp.728-730
    • /
    • 1998
  • The control valve positioner is a high gain plain proportional controller which measures the valve stem position and compares it to its setpoint which is the primary controller output. The positioner in effect is the cascade slave of the primary controller. In order for a cascade slave to be effecttive, it must be fast enough compared to the speed of its set point change. This paper describes the positioner transfer function and its effect on the entire control loop characteristic based on the simulation results. The result showed that the control valve and positioner determined the gain and phase angle in the high frequency range, while the primary controller and process determined those of the low frequency range. We can also anticipate the combined characteristics in the whole frequency range when each element's frequency response is known.

  • PDF

High performance torque control of induction motor by speed sensorless vector control

  • Harashima, Fumio;Kondo, Seiji;Inoue, Shuji
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1990.10b
    • /
    • pp.1410-1414
    • /
    • 1990
  • A method of speed sensorless vector control of induction motor is proposed in this paper. This method uses the slip frequency estimated by only the primary voltage and current. As this slip frequency accords with the command value of it, the commanded primary frequency is controlled. The validity of the method is confirmed by the simulation and experimental results.

  • PDF

Integrated Control Strategy of Multiple BESS for providing Primary Frequency Control (주파수추종서비스 제공을 위한 다수 배터리전기저장장치(BESS)의 통합제어 전략)

  • Yu, Ga Ram;Choi, Woo Yeong;Kook, Kyung Soo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.7
    • /
    • pp.1169-1175
    • /
    • 2016
  • As an Increased penetration level of renewable resources has caused concerns about primary frequency response, an increase in BESS(Battery Energy Storage System) capacity has been expected because of its fast response to the disturbances in the power system. This paper proposes the Integrated Control Strategy of multiple BESS for effectively providing the primary frequency control in the bulk power systems by coordinating the response, SOC and its recovery of BESS. The proposed strategy prevents multiple BESS from providing exceeding response and keeps the balance between SOC of multiple BESS. In addition, It would recover the SOC of BESS efficiently. The effectiveness of the proposed strategy is verified through various case studies employing Korean power system.

Effects of Phase Difference between Voltage loaves Applied to Primary and Secondary Electrodes in Dual Radio Frequency Plasma Chamber

  • Kim, Heon-Chang
    • Journal of the Semiconductor & Display Technology
    • /
    • v.4 no.2 s.11
    • /
    • pp.11-14
    • /
    • 2005
  • In plasma processing reactors, it is common practice to control plasma density and ion bombardment energy by manipulating excitation voltage and frequency. In this paper, a dually excited capacitively coupled rf plasma reactor is self-consistently simulated with a three moment model. Effects of phase differences between primary and secondary voltage waves, simultaneously modulated at various combinations of commensurate frequencies, on plasma properties are investigated. The simulation results show that plasma potential and density as well as primary self-dc bias are nearly unaffected by the phase lag between the primary and the secondary voltage waves. The results also show that, with the secondary frequency substantially lower than the primary frequency, secondary self·do bias remains constant regardless of the phase lag. As the secondary frequency approaches to the primary frequency, however, the secondary self-dc bias becomes greatly altered by the phase lag, and so does the ion bombardment energy at the secondary electrode. These results demonstrate that ion bombardment energy can be more carefully controlled through plasma simulation.

  • PDF

Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control

  • Li, Hao Leo;Hu, Aiguo Patrick;Covic, Grant Anthony
    • Journal of Power Electronics
    • /
    • v.11 no.3
    • /
    • pp.256-263
    • /
    • 2011
  • This paper utilizes free oscillation and energy injection principles to generate and control the high frequency current in the primary track of a contactless power transfer system. Here the primary power inverter maintains natural resonance while ensuring near constant current magnitude in the primary track as required for multiple independent loads. Such energy injection controllers exhibit low switching frequency and achieve ZCS (Zero Current Switching) by detecting the high frequency current, thus the switching stress, power losses and EMI of the inverter are low. An example full bridge topology is investigated for a contactless power transfer system with multiple pickups. Theoretical analysis, simulation and experimental results show that the proposed system has a fast and smooth start-up transient response. The output track current is fully controllable with a sufficiently good waveform for contactless power transfer applications.

Modeling and Control of Integrated STATCOM-SMES System to Improve Power System Oscillations Damping

  • Molina, Marcelo G.;Mercado, Pedro E.
    • Journal of Electrical Engineering and Technology
    • /
    • v.3 no.4
    • /
    • pp.528-537
    • /
    • 2008
  • Primary frequency control(PFC) has the ability to regulate short period random variations of frequency during normal operation conditions and also to respond rapidly to emergencies. However, during the past decade, numerous significant sized blackouts occurred worldwide that resulted in serious economic losses. Therefore, the conclusion has been reached that the ability of the current PFC to meet an emergency is poor, and security of power systems should be improved. An alternative to enhance the PFC and thus security is to store excessive amounts of energy during off-peak load periods in efficient energy storage systems for substituting the primary control reserve. In this sense, superconducting magnetic energy storage(SMES) in combination with a static synchronous compensator(STATCOM) is capable of supplying power systems with both active and reactive powers simultaneously and very rapidly, and thus is able to enhance the security dramatically. In this paper, a new concept of PFC based on incorporating a STATCOM-SMES is presented. A complete detailed model is proposed and a new control scheme is designed, comprising an enhanced frequency control scheme, and a fully decoupled current control strategy in d-q coordinates with a novel controller to prevent dc bus capacitors voltage drift/imbalance. The performance of the proposed control schemes is validated through digital simulation carried out using MATLAB/Simulink.

Simulation of a Dually Excited Capacitively Coupled RF Plasma

  • Kim, Heon-Chang;Sul, Yong-Tae;Park, Sung-Jin
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2005.07a
    • /
    • pp.513-514
    • /
    • 2005
  • In plasma processing reactors, it is common practice to control plasma density and ion bombardment energy by manipulating excitation voltage and frequency. In this paper, a dually excited capacitively coupled rf plasma reactor is self-consistently simulated with a three moment model. Effects of phase differences between primary and secondary voltage waves, simultaneously modulated at various combination of commensurate frequencies, on plasma properties are investigated. The simulation results show that plasma potential and density as well as primary self-dc bias are nearly unaffected by the phase lag between the primary and the secondary voltage waves. The results also show that, with the secondary frequency substantially lower than the primary frequency, secondary self-dc bias remains constant regardless of the phase lag. As the secondary frequency approaches to the primary frequency, however, the secondary self-dc bias becomes greatly altered by the phase lag, and so does the ion bombardment energy at the secondary electrode. These results demonstrate that ion bombardment energy can be more carefully controlled through plasma simulation.

  • PDF

Feasibility and performance limitations of Supercritical carbon dioxide direct-cycle micro modular reactors in primary frequency control scenarios

  • Seongmin Son;Jeong Ik Lee
    • Nuclear Engineering and Technology
    • /
    • v.56 no.4
    • /
    • pp.1254-1266
    • /
    • 2024
  • This study investigates the application of supercritical carbon dioxide (S-CO2) direct-cycle micro modular reactors (MMRs) in primary frequency control (PFC), which is a scenario characterized by significant load fluctuations that has received less attention compared to secondary load-following. Using a modified GAMMA + code and a deep neural network-based turbomachinery off-design model, the authors conducted an analysis to assess the behavior of the reactor core and fluid system under different PFC scenarios. The results indicate that the acceptable range for sudden relative electricity output (REO) fluctuations is approximately 20%p which aligns with the performance of combined-cycle gas turbines (CCGTs) and open-cycle gas turbines (OCGTs). In S-CO2 direct-cycle MMRs, the control of the core operates passively within the operational range by managing coolant density through inventory control. However, when PFC exceeds 35%p, system control failure is observed, suggesting the need for improved control strategies. These findings affirm the potential of S-CO2 direct-cycle MMRs in PFC operations, representing an advancement in the management of grid fluctuations while ensuring reliable and carbon-free power generation.