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This paper presents a basic study about the control ability of LNG thermal power plant driven by Motorāassisting Gas Turbine (MGT) for frequency stabilization of power grid system. An analytical model of the regulation system with assisting motor and gas turbine is developed, and its performance for frequency stabilization under fluctuating power due to renewable energy sources is investigated by numerical simulation analyses.
Rion Takahashi; Atsushi Umemura; Junji Tamura; Mamoru Kimura; Noriaki Hino. Simulation analyses of stabilization control of power system frequency fluctuations resulting from wind farm output by gas turbine thermal power plant. Electrical Engineering in Japan 2020, 214, 1 .
AMA StyleRion Takahashi, Atsushi Umemura, Junji Tamura, Mamoru Kimura, Noriaki Hino. Simulation analyses of stabilization control of power system frequency fluctuations resulting from wind farm output by gas turbine thermal power plant. Electrical Engineering in Japan. 2020; 214 (2):1.
Chicago/Turabian StyleRion Takahashi; Atsushi Umemura; Junji Tamura; Mamoru Kimura; Noriaki Hino. 2020. "Simulation analyses of stabilization control of power system frequency fluctuations resulting from wind farm output by gas turbine thermal power plant." Electrical Engineering in Japan 214, no. 2: 1.
This paper proposes the application of an adjustable speed diesel engine-driven power plant employing a doubly-fed induction generator to an isolated small-scale power system including renewable power sources. This type of power plant can contribute to fast and flexible power balancing regulation under vacillating power supply such as wind, solar and other renewable power sources. Installation of a battery system is also considered, which can assist in coordinating the power plant to augment renewable power sources in the isolated power system.
Rion Takahashi; Atsushi Umemura; Junji Tamura. Cooperative Frequency Control of a Small-Scale Power System between Diesel Engine Driven Adjustable Speed Generator and Battery. Applied Sciences 2020, 10, 9085 .
AMA StyleRion Takahashi, Atsushi Umemura, Junji Tamura. Cooperative Frequency Control of a Small-Scale Power System between Diesel Engine Driven Adjustable Speed Generator and Battery. Applied Sciences. 2020; 10 (24):9085.
Chicago/Turabian StyleRion Takahashi; Atsushi Umemura; Junji Tamura. 2020. "Cooperative Frequency Control of a Small-Scale Power System between Diesel Engine Driven Adjustable Speed Generator and Battery." Applied Sciences 10, no. 24: 9085.
The penetration level of large-scale wind farms into power systems has been increasing significantly, and the frequency stability and transient stability of the power systems during and after a network fault can be negatively affected. This paper proposes a new control method to improve the stability of power systems that are composed of large wind farms, as well as usual synchronous generators. The new method is a coordinated controlling method between an adjustable-speed pumping generator (ASG) and a battery. The coordinated system is designed to improve power system stability during a disconnection in a fixed-rotor-speed wind turbine with a squirrel cage-type induction generator (FSWT-SCIG)-based wind farm due to a network fault, in which a battery first responds quickly to the system frequency deviation due to a grid fault and improves the frequency nadir, and then the ASG starts to supply compensatory power to recover the grid frequency to the rated frequency. The performance of the proposed system was confirmed through simulation studies on a power system model consisting of usual synchronous generators (SGs), an ASG, a battery, and an SCIG-based wind farm. Simulation results demonstrated that the proposed control system can enhance the stability of the power system effectively.
Junji Tamura; Atsushi Umemura; Rion Takahashi; Atsushi Sakahara; Fumihito Tosaka; Ryosuke Nakamoto. Enhancement of Power System Transient Stability by the Coordinated Control between an Adjustable Speed Pumping Generator and Battery. Applied Sciences 2020, 10, 9034 .
AMA StyleJunji Tamura, Atsushi Umemura, Rion Takahashi, Atsushi Sakahara, Fumihito Tosaka, Ryosuke Nakamoto. Enhancement of Power System Transient Stability by the Coordinated Control between an Adjustable Speed Pumping Generator and Battery. Applied Sciences. 2020; 10 (24):9034.
Chicago/Turabian StyleJunji Tamura; Atsushi Umemura; Rion Takahashi; Atsushi Sakahara; Fumihito Tosaka; Ryosuke Nakamoto. 2020. "Enhancement of Power System Transient Stability by the Coordinated Control between an Adjustable Speed Pumping Generator and Battery." Applied Sciences 10, no. 24: 9034.
Wind farm (WF) grid codes require wind generators to have low voltage ride through (LVRT) capability, which means that normal power production should be resumed quickly once the nominal grid voltage has been recovered. However, WFs with fixed-speed wind turbines with squirrel cage induction generators (FSWT-SCIGs) have failed to fulfill the LVRT requirement, which has a significant impact on power system stability. On the other hand, variable-speed wind turbines with doubly fed induction generators (VSWT-DFIGs) have sufficient LVRT augmentation capability and can control the active and reactive power delivered to the grid. However, the DFIG is more expensive than the SCIG due to its AC/DC/AC converter. Therefore, the combined use of SCIGs and DFIGs in a WF could be an effective solution. The design of the rotor-side converter (RSC) controller is crucial because the RSC controller contributes to the system stability. The cascaded control strategy based on four conventional PI controllers is widely used to control the RSC of the DFIG, which can inject only a small amount of reactive power during fault conditions. Therefore, the conventional strategy can stabilize the lower rating of the SCIG. In the present paper, a new control strategy based on fuzzy logic is proposed in the RSC controller of the DFIG in order to enhance the LVRT capability of the SCIG in a WF. The proposed fuzzy logic controller (FLC) is used to control the reactive power delivered to the grid during fault conditions. Moreover, reactive power injection can be increased in the proposed control strategy. Extensive simulations executed in the PSCAD/EMTDC environment for both the proposed and conventional PI controllers of the RSC of the DFIG reveal that the proposed control strategy can stabilize the higher rating of the SCIG.
Rifat Hazari; Mohammad Abdul Mannan; S. M. Muyeen; Atsushi Umemura; Rion Takahashi; Junji Tamura. Stability Augmentation of a Grid-Connected Wind Farm by Fuzzy-Logic-Controlled DFIG-Based Wind Turbines. Applied Sciences 2017, 8, 20 .
AMA StyleRifat Hazari, Mohammad Abdul Mannan, S. M. Muyeen, Atsushi Umemura, Rion Takahashi, Junji Tamura. Stability Augmentation of a Grid-Connected Wind Farm by Fuzzy-Logic-Controlled DFIG-Based Wind Turbines. Applied Sciences. 2017; 8 (1):20.
Chicago/Turabian StyleRifat Hazari; Mohammad Abdul Mannan; S. M. Muyeen; Atsushi Umemura; Rion Takahashi; Junji Tamura. 2017. "Stability Augmentation of a Grid-Connected Wind Farm by Fuzzy-Logic-Controlled DFIG-Based Wind Turbines." Applied Sciences 8, no. 1: 20.
In this paper, a design fuzzy logic controller for a variable speed permanent magnet wind generator connected to a grid system through a LC-filter is proposed. A new current control method of grid side conversion is developed by integrating the fuzzy controller, in which both active and reactive power, delivered to a power grid system, is controlled effectively. The fuzzy logic controller is designed to adjust the gain parameters of the PI controllers under any operating conditions, so that the dynamic stability is enhanced. A new simple method, based on frequency response of the bode diagram, is proposed in the design of the fuzzy logic controller. To evaluate the controller system capabilities, simulation analyses are performed on a small wind farm model system including an induction wind generator connected to an infinite bus. The simulations have been performed using PSCAD/EMTDC. Simulation results show that the proposed control scheme is more effective for enhancing the stability of wind farms during temporary and permanent network disturbances and randomly fluctuating wind speed, compared with that of a conventional PI controller.
Marwan Rosyadi; S. M. Muyeen; Rion Takahashi; Junji Tamura. A Design Fuzzy Logic Controller for a Permanent Magnet Wind Generator to Enhance the Dynamic Stability of Wind Farms. Applied Sciences 2012, 2, 780 -800.
AMA StyleMarwan Rosyadi, S. M. Muyeen, Rion Takahashi, Junji Tamura. A Design Fuzzy Logic Controller for a Permanent Magnet Wind Generator to Enhance the Dynamic Stability of Wind Farms. Applied Sciences. 2012; 2 (4):780-800.
Chicago/Turabian StyleMarwan Rosyadi; S. M. Muyeen; Rion Takahashi; Junji Tamura. 2012. "A Design Fuzzy Logic Controller for a Permanent Magnet Wind Generator to Enhance the Dynamic Stability of Wind Farms." Applied Sciences 2, no. 4: 780-800.