This paper presents the concept of using fuzzy control methods in the construction of energy efficient systems based on photovoltaic modules. An analysis was made of methods to improve efficiency in the case of weather in Vietnam on a sunny summer day for photovoltaic modules. The results show that the efficiency of the proposed system is increased by 27.91%, 23.30% and 4.95% compared to the PV module, respectively, with a fixed tilt system, a water-cooled system, and a solar tracking system. The simulation results can serve as a prerequisite for future experimental models.

Keywords: Photovoltaic module, thermoelectric model, solar tracking, water cooling, efficiency, fuzzy logic

Today, photovoltaic systems are widely used, but the tasks of increasing the efficiency and reducing the cost of such systems are still relevant. Among many methods for increasing photoelectric efficiency, the method of active water cooling stands out, the use of which is especially important for Vietnam and other countries with a tropical climate. This article is devoted to the analysis of methods of active water cooling, the analysis of the experimental design of photovoltaic modules and systems, as well as methods to increase efficiency through the use of water cooling.high compared to people's lives. Therefore, it is necessary to study the performance improvement as well as reduce the cost of the photovoltaic system. Among many methods of improving photovoltaic efficiency, active water cooling is quite effective and low cost. This paper focuses on the analysis of active water cooling methods, experimental layout, as well as improved performance when applying cooling.

Keywords: photoelectric module; water cooling method; active cooling, efficiency

Microelectromechnical system MEMS gyroscopes and accelerometers are using to measure the angular velocity of rotation and linear acceleration of an object, respectively. In many applications, the measurement of the angle is required, but gyroscopes have a mixing error that occurs when integrating the angular output velocity and the accelerometers have an error due to the translation force. This article presents a method for designing a complementary filter for estimating an angle using accelerometer and gyroscope and discusses the behavior of complementary filter in Matlab. As a results, the development of complementary filter system used to estimate the angle, can be used to consistenty and accurately improve the determination of the angle.

Keywords: accelerometer, gyroscope, complementary filter, MEMS microelectromechanical system