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- 저자 : Shuaitao Zhao (검색결과 5 건)
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Shuaitao Zhao,Chaosheng Song,Siyuan Liu,Cheng Xu,Caichao Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
This study establishes the mathematical model of aviation spiral bevel gear with tilt structure by considering the spatial relationship between cutter and gear blank involved machine-tool settings, and builds a finite element model for the spiral bevel gear with a thin web and narrow rim structure. It also investigates the influence law of different parameters of gear blank on the mesh characteristics. Results show that the decrement of the thickness of the rim does not influence the position of contact pattern. When the thickness of the rim is reduced, the tooth root stress shows an increasing trend and the peak-to-peak value of the transmission errors first decreases and then increases. A reduction of the web causes the position of contact pattern moving slightly from the center part to the heel. When the web thickness gets lower, the tooth root stress greatly declines, while the peak-to-peak value of the transmission errors keeps rising. When increasing the number of rows of the hole, the position of contact pattern gradually shifts from the middle to the heel, the changes of tooth root stress are not obvious, and the peak-to-peak value of the transmission errors initially decreases, but then increases afterwards.
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Shuaitao Zhang,Jinbin Zhao,Yang Chen,Chaojie He 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.5
Inverters are widely used in distributed power generation and other applications. However, their lack of inertia and variable impedance may cause system instability and power transfer inaccuracy. This paper proposes a control scheme for a single phase voltage-controlled inverter with some grid-friendly characteristics. The proposed control algorithm enables the inverter to function as a voltage source with an inner output impedance in both the islanded and grid-connected modes. Virtual inertia and rotor equations are embedded in the PLL part. Thus, the frequency stability can remain. The inner output impedance can be adjusted freely, which helps to accurately decouple and transmit the output active and reactive power. The proposed inverter operates like a traditional synchronous generator. Simulations and experiments are designed and carried out to verify the proposed control strategy.
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Zhang, Shuaitao,Zhao, Jinbin,Chen, Yang,He, Chaojie The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.5
Inverters are widely used in distributed power generation and other applications. However, their lack of inertia and variable impedance may cause system instability and power transfer inaccuracy. This paper proposes a control scheme for a single phase voltage-controlled inverter with some grid-friendly characteristics. The proposed control algorithm enables the inverter to function as a voltage source with an inner output impedance in both the islanded and grid-connected modes. Virtual inertia and rotor equations are embedded in the PLL part. Thus, the frequency stability can remain. The inner output impedance can be adjusted freely, which helps to accurately decouple and transmit the output active and reactive power. The proposed inverter operates like a traditional synchronous generator. Simulations and experiments are designed and carried out to verify the proposed control strategy.
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Power Control Strategies for Single-Phase Voltage-Controlled Inverters with an Enhanced PLL
Gao, Jiayuan,Zhao, Jinbin,He, Chaojie,Zhang, Shuaitao,Li, Fen The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
For maintaining a reliable and secure power system, this paper describes the design and implement of a single-phase grid-connected inverter with an enhanced phase-locked loop (PLL) and excellent power control performance. For designing the enhanced PLL and power regulator, a full-bridge voltage-controlled inverter (VCI) is investigated. When the grid frequency deviates from its reference values, the output frequency of the VCI is unstable with an oscillation of 2 doubling harmonics. The reason for this oscillation is analyzed mathematically. This oscillation leads to an injection of harmonics into the grid and even causes an output active power oscillation of the VCI. For eliminating the oscillation caused by a PLL, an oscillation compensation method is proposed. With the proposed method, the VCI maintains the original PLL control characteristics and improves the PLL robustness under grid frequency deviations. On the basis of the above analysis, a power regulator with the primary frequency and voltage modulation characteristics is analyzed and designed. Meanwhile, a small-signal model of the power loops is established to determine the control parameters. The VCI can accurately output target power and has primary frequency and voltage modulation characteristics that can provide active and reactive power compensation to the grid. Finally, simulation and experimental results are given to verify the idea.
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Power Control Strategies for Single-Phase Voltage-Controlled Inverters with an Enhanced PLL
Jiayuan Gao,Jin-Bin Zhao,Chaojie He,Shuaitao Zhang,Fen Li 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
For maintaining a reliable and secure power system, this paper describes the design and implement of a single-phase grid-connected inverter with an enhanced phase-locked loop (PLL) and excellent power control performance. For designing the enhanced PLL and power regulator, a full-bridge voltage-controlled inverter (VCI) is investigated. When the grid frequency deviates from its reference values, the output frequency of the VCI is unstable with an oscillation of 2 doubling harmonics. The reason for this oscillation is analyzed mathematically. This oscillation leads to an injection of harmonics into the grid and even causes an output active power oscillation of the VCI. For eliminating the oscillation caused by a PLL, an oscillation compensation method is proposed. With the proposed method, the VCI maintains the original PLL control characteristics and improves the PLL robustness under grid frequency deviations. On the basis of the above analysis, a power regulator with the primary frequency and voltage modulation characteristics is analyzed and designed. Meanwhile, a small-signal model of the power loops is established to determine the control parameters. The VCI can accurately output target power and has primary frequency and voltage modulation characteristics that can provide active and reactive power compensation to the grid. Finally, simulation and experimental results are given to verify the idea.
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