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New, Simple Blade-Pitch Control Mechanism for Small-Size, Horizontal-Axis Wind Turbines

Journal of Energy and Power Engineering 2013年第12期7卷 2237-2248页

作者： Ahmed Farouk Abdel Gawad College of Engineering and Islamic Architecture Umm AI-Qura University Makkah 5555 Saudi Arabia

In the present research work, the pitch-control is carried out such that the rotor blades are rotated around their longitudinal axis while the rotor continues its normal rotation. It is really a challenge to produce a clever design to pitch the rotor blades by the optimal amount so as to maximize the power output at all wind speeds. The mechanism is implemented to a three-blade, horizontal-axis, home-scale wind turbine. The mechanism is powered by a suitable DC （direct-current） motor. The tests were carried out in the open section of a delivery wind tunnel. The air speed was measured by a suitable anemometer. The corresponding rotational speed （rpm） and output voltage at different wind speeds were measured and recorded for calibration of the control system. The mechanism proved to be successful in controlling the pitch angle over a wide range of wind speeds.

关键词： Blade-pitch control wind turbine home-scale control mechanism microcontroller.

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Low-Cost Data Acquisition Systems for Photovoltaic System Monitoring and Usage Statistics

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Journal of Energy and Power Engineering 2017年第11期11卷 719-728页

作者： Sofia Fanourakis Kevin Wang Patrick McCarthy Lihong (Heidi) Jiao School of Engineering Grand Valley State University Grand Rapids M149504 USA Forest Hills Central High School Grand Rapids MI 49546 USA

This paper presents the design of a low-cost DAS （data acquisition system） for monitoring a PV （photovoltaic） system＇s electrical quantities, battery temperatures, and state of charge of the battery. The electrical quantities are the voltages and currents of the solar panels, the battery, and the system loads. The system uses an Atmega328p microcontroller.to acquire data from the PV system＇s charge controller. It also records individual load information using current sensing resistors along with a voltage amplification circuit and an analog to digital converter. The system is used in conjunction with a wall power DAS for the recording of regional power outages. Both DASs record data in microSD cards. The data have been successfully acquired from both systems and have been used to monitor the status of the PV system and the local power grid. As more data are gathered, it can be used for the maintenance and improvement of the PV system through analysis of the PV system＇s parameters and usage statistics.

关键词： Low-cost data acquisition PV system microcontroller.

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