摘要 :
This paper presents that a detailed steady-state and small-signal analysis of a modified Sheppard-Taylor converter using an average mode is designed for PEM fuel cell applications. Thus, a small-signal average model has all been o...
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This paper presents that a detailed steady-state and small-signal analysis of a modified Sheppard-Taylor converter using an average mode is designed for PEM fuel cell applications. Thus, a small-signal average model has all been obtained. According to the analysis above, transfer functions between duty cycle and output voltage and between input and output voltages have been also obtained, so some simplifications and design rules have been proposed to facilitate the design of the feedback loop. Simulink results are given to show the overall system performance.
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摘要 :
Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc source...
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Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc sources include batteries, photovoltaic arrays and fuel cells...etc. If variations or fluctuations occur at the input voltage, the harmonic distortion of the inverter output voltage will increase. The conducting angles of switches in the conventional cascade multilevel inverters are obtained by the use of Fourier series to minimize the harmonic distortion of output voltage. The traditional method is complex and difficult to implement on a single chip, especially when the input voltage sources can not remain constant and stable. A switching control algorithm is proposed for cascade multilevel inverter with variable dc voltage sources. The proposed control combines the output voltage feedback and the feedforward voltage method to achieve dynamic control and low distortion of the inverter output voltage. Analysis, simulations and experimental results are presented to demonstrate the superiority of the proposed system.
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摘要 :
Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc source...
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Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc sources include batteries, photovoltaic arrays and fuel cells...etc. If variations or fluctuations occur at the input voltage, the harmonic distortion of the inverter output voltage will increase. The conducting angles of switches in the conventional cascade multilevel inverters are obtained by the use of Fourier series to minimize the harmonic distortion of output voltage. The traditional method is complex and difficult to implement on a single chip, especially when the input voltage sources can not remain constant and stable. A switching control algorithm is proposed for cascade multilevel inverter with variable dc voltage sources. The proposed control combines the output voltage feedback and the feedforward voltage method to achieve dynamic control and low distortion of the inverter output voltage. Analysis, simulations and experimental results are presented to demonstrate the superiority of the proposed system.
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This paper proposes the design and implementation of power converters for wind energy conversion system. The proposed system consists of a wind generator, a boost converter, and a full-bridge inverter. The wind generator is the ma...
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This paper proposes the design and implementation of power converters for wind energy conversion system. The proposed system consists of a wind generator, a boost converter, and a full-bridge inverter. The wind generator is the main power source of the system, and a digital signal processor (TMS320F2812A) is used to be the system controller. The system controls the duty cycle of the boost converter to achieve the maximum power tracking. Finally, a unipolar switching full-bridge inverter is used to provide a stable output voltage. The experimental and simulation results on a 200-W wind generator are provided to verify the performance of the proposed system.
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摘要 :
This paper proposes the design and implementation of power converters for wind energy conversion system. The proposed system consists of a wind generator, a boost converter, and a full-bridge inverter. The wind generator is the ma...
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This paper proposes the design and implementation of power converters for wind energy conversion system. The proposed system consists of a wind generator, a boost converter, and a full-bridge inverter. The wind generator is the main power source of the system, and a digital signal processor (TMS320F2812A) is used to be the system controller. The system controls the duty cycle of the boost converter to achieve the maximum power tracking. Finally, a unipolar switching full-bridge inverter is used to provide a stable output voltage. The experimental and simulation results on a 200-W wind generator are provided to verify the performance of the proposed system.
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The implementation of power converter for wind generator controlled by digital signal processor is presented in this paper. The proposed system is composed of a wind generator, lead-acid batteries, a three phase ac/dc full-bridge ...
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The implementation of power converter for wind generator controlled by digital signal processor is presented in this paper. The proposed system is composed of a wind generator, lead-acid batteries, a three phase ac/dc full-bridge semicontrolled boost rectifier, a dc/dc single-ended primary inductance converter (SEPIC), a bi-directional converter and a full-bridge inverter. The wind generator is used as the main power source, and lead-acid batteries as the auxiliary power source. The proposed system adopts power factor correction to achieve unit power factor and maximum power point tracking (MPPT) to implement available maximum power, thus to improve the overall system performance. In addition, the bidirectional converter provides charging and discharging compensation to dc bus by controlling the duty cycle of switches. Finally, the full-bridge inverter produces a stable ac output with feedback.
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摘要 :
The implementation of power converter for wind generator controlled by digital signal processor is presented in this paper. The proposed system is composed of a wind generator, lead-acid batteries, a three phase ac/dc full-bridge ...
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The implementation of power converter for wind generator controlled by digital signal processor is presented in this paper. The proposed system is composed of a wind generator, lead-acid batteries, a three phase ac/dc full-bridge semicontrolled boost rectifier, a dc/dc single-ended primary inductance converter (SEPIC), a bi-directional converter and a full-bridge inverter. The wind generator is used as the main power source, and lead-acid batteries as the auxiliary power source. The proposed system adopts power factor correction to achieve unit power factor and maximum power point tracking (MPPT) to implement available maximum power, thus to improve the overall system performance. In addition, the bidirectional converter provides charging and discharging compensation to dc bus by controlling the duty cycle of switches. Finally, the full-bridge inverter produces a stable ac output with feedback.
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摘要 :
This paper proposes a novel high step-up converter with an average mode control which is designed for power generation applications. The detailed steady-state analysis for the system is presented. According to the steady-state ana...
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This paper proposes a novel high step-up converter with an average mode control which is designed for power generation applications. The detailed steady-state analysis for the system is presented. According to the steady-state analysis, transfer functions of input voltage versus output voltage and duty cycle versus output voltage are obtained. In addition, some simplifications and design rules are proposed to facilitate the design of the feedback loop. Simulation and experimental results are given to show the overall system performance.
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摘要 :
This paper proposes a novel high step-up converter with an average mode control which is designed for power generation applications. The detailed steady-state analysis for the system is presented. According to the steady-state ana...
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This paper proposes a novel high step-up converter with an average mode control which is designed for power generation applications. The detailed steady-state analysis for the system is presented. According to the steady-state analysis, transfer functions of input voltage versus output voltage and duty cycle versus output voltage are obtained. In addition, some simplifications and design rules are proposed to facilitate the design of the feedback loop. Simulation and experimental results are given to show the overall system performance.
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摘要 :
The fuel cells (FC) for vehicle and home power generation application is widely developed during recent years. Because the fuel cell does not have capability for energy storage and its output voltage is easily affected by load var...
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The fuel cells (FC) for vehicle and home power generation application is widely developed during recent years. Because the fuel cell does not have capability for energy storage and its output voltage is easily affected by load variations and polarization loss, the power electronic technique is required to solve the problems of the unstable output voltage and fast energy compensation. And to better design these kinds of applications, the FC dynamic model is required. Due to the PEM (Polymer Electrolyte Membrane) FC stack characteristic, the stack temperature will affect the output voltage, output current and the stack temperature. Therefore, how to obtain a stable output and the optimum control is the focus of this paper. The current mode control is applied for the proposed system. A good dynamic response can be achieved when the load changes. A digital signal processor (DSP) is applied for the system control. Finally, a 600W hybrid generation system including the fuel cells, lead-acid batteries and a bi-directional dc/dc converter is constructed and verified through experiments.
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