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Experimental evaluation of a digital speed regulation of a PMDC motor by an HCS12 microcontroller

Menad Abdelmadjid, Tahri Ali

Przegląd Elektrotechniczny

2021

R. 97, nr 6

107--112

Rotating machines such as DC motors have wide use in industry. Generally permanent magnet direct current motors in various applications have good performance and simple control. This article describes a practical embodiment of a digital speed control implementation of a permanent magnet direct current motor with a PI regulator using a Motorola model HCS12 microcontroller. The latter receives the speed reference and generates the control signal (PWM) in order to control the armature voltage of the motor to satisfy the speed reference. The experimental results are given in this article.

Generalnie silniki prądu stałego z magnesami trwałymi w różnych zastosowaniach mają dobrą wydajność i proste sterowanie. W tym artykule opisano praktyczną realizację implementacji cyfrowej regulacji prędkości silnika prądu stałego z magnesami trwałymi z regulatorem PI przy użyciu mikrokontrolera Motorola HCS12. Kontroler odbiera prędkość odniesienia i generuje sygnał sterujący (PWM) w celu sterowania napięciem twornika silnika w celu spełnienia zadanej prędkości. Wyniki eksperymentów podano w tym artykule.

Energy and environmental performance analysis of grid-connected photovoltaic systems under similar outdoor conditions in the Saharan environment

Deriche Mohammed Amine, Hafaifa Ahmed, Tahri Ali, Mohammedi Kamal, Tahri Fatima

Diagnostyka

2020

Vol. 21, No. 2

13--23

The aim of this paper is to present a one-year performance analysis of four grid-connected PV systems installed at Ghardaia city in Algeria’s Sahara. The grid-connected PV systems are based on four different PV module technologies which are: monocrystalline silicon (m-Si), multi-crystalline silicon (mc-Si), cadmium telluride (Cd-Te) and amorphous (a-Si) PV module technologies. The PV systems based on the thin film technologies have their performance ratio better throughout the year when the performance ratio of the mc-Si technology is better in the winter season. The a-Si PV system has its performance ratio about 6.13 % more better than mc-Si and 8.90 % better than m-Si. The AC energy produced with the a-Si PV system is 13.32 % more than what the mc-Si system produces. It was found that the a-Si PV system performs better than the other technologies under the Saharan climate conditions of Ghardaia city. The energy payback time (EPBT) and greenhouse gases (GHG) emissions of the different PV systems were analyzed. The EPBT and GHG emissions per year, vary from a minimum value of 2.8 years to a maximum value of 5.73 years and from 13.24 tons to 32.03 tons of CO2/kWh for CdTe and m-Si respectively. The CdTe PV system performs better in terms of EPBT and GHG emissions compared to the other technologies (m-Si, mc-Si and a-Si) due to its low life cycle energy requirement.