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RISS 인기검색어
- 검색키워드
- 저자 : Zhao Xilin (검색결과 3 건)
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Xilin Zhao,Zhenyu Lin,Bo Fu,Li He,Chaoshun Li 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
Because of the uncertainty of the external environment, high penetration of renewable energy such as wind power and solar energy in the modern power system renders the traditional automatic generation control (AGC) methods more challenging. An improved AGC method named predictive optimal proportional integral diff erential plus second order derivative (POPID + DD) for multi-area interconnected grid is proposed in this paper to reduce the negative impacts of the uncertainty which is caused by the high penetration of renewable energy. Firstly, the mathematical model of the AGC system of multiarea power grid with penetration of photovoltaic (PV) and wind power is built. Then, PO-PID + DD controller is presented to improve the system robustness with respect to system uncertainties. In order to obtain the predictive sequence of the integral system output, the characteristic of the controller is included in the system model. Thus, according to the predictive sequence and designed objective function, the input of the controller can be readjusted to obtain the optimal eff ect of AGC. An IEEE 39-bus system is introduced as an example to testify the feasibility and eff ectiveness of the proposed method. The simulation results indicate that the system controlled by the proposed controller has desired dynamic performances.
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Zhao Xilin,Gong Sili,Fu Bo,Gong Chufeng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
To solve the LFC issues of the HVDC multi-area grids caused by the participation of the wind power, a novel control strategy is proposed in this paper. Firstly, considering that the wind turbines participate in the primary frequency regulation, the LFC model of the multi-area interconnected grids with HVDC tie-line is constructed. Due to the uncertainty of wind speed, the parameters of the LFC system are dynamic. Then, a control structure with the cascade of the time-varying MPC and PID controller is designed. The PID is connected in series behind to adjust the output of the time-varying MPC so as to improve its control performance. Furthermore, a dynamic hierarchical control method is proposed, of which time-varying MPC activates or not depends on the control requirements. It applies only the PID controller when frequency changes little but the cascade structure with PID and time-varying MPC when that changes much. Because the LFC system of each area is an independent subsystem among which the information can transfer, a MAS is put forward during the design. Finally, a three-area interconnected power system is analyzed to testify the feasibility of the proposed method. The simulation results show that the proposed control method can reduce the time complexity of system control algorithm by adjusting the participation of the upper time-varying MPC controller, which is under the premise of ensuring the control effect.
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Takahashi, Yutaka,Cho, Deung‐,Lyong,Mao, Jianren,Zhao, Xilin,Yi, Keewook Blackwell Scientific 2018 The island arc Vol.27 No.1
<P><B>Abstract</B></P><P>A new U–Pb zircon geochronological study for the Hida metamorphic and plutonic rocks from the Tateyama area in the Hida Mountains of north central Japan is presented. The U–Pb ages of metamorphic zircon grains with inherited/detrital cores in paragneisses suggest that a metamorphic event took place at around 235–250 Ma; the cores yield ages around 275 Ma, 300 Ma, 330 Ma, 1 850 Ma, and 2 650 Ma. New age data, together with geochronological and geological context of the Hida Belt, indicate that a sedimentary protolith of the paragneisses is younger than 275 Ma and was crystallized at around 235–250 Ma. Detrital ages support a model that the Hida Belt was located in the eastern margin of the North China Craton, which provided zircon grains from Paleoproterozoic to Paleozoic rocks and also from Archean and rare Neoproterozoic rocks. Triassic regional metamorphism possibly reflects collision between the North and South China Cratons.</P>
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