Abstract
In this paper, we present the development of charge and discharge controller of battery used in low power wind applications. This controller allows on the one hand protecting the battery against overcharging and deep discharge. On the other hand, it helps to protect the turbine against strong winds. It is controlled by PIC microcontroller 16F877A. This control function is performed using an algorithm that continuously compares the battery voltage to the charge and discharge thresholds, and tilting towards dissipation resistors. The control signals generated by the microcontroller are PWM (Pulse Width Modulation) type. The validation of the main functions of the controller is presented.
Highlights
As in photovoltaic systems, wind energy applications include most often batteries for storing excess energy and feed loads low and medium powers
We present the development of charge and discharge controller of battery used in low power wind applications
Additional constraints imposed on the controller such as the possibility of varying the parameters of the control algorithm and display the battery charge level, increase its complexity and lead us to opt for a smart solution based on microcontrollers
Summary
Wind energy applications include most often batteries for storing excess energy and feed loads low and medium powers. The principle often used for photovoltaic controller consists in disconnecting the PV generator from the batteries. The principle adopted for the control of the batteries charge/ discharge for wind systems must take into account this constraint. The importance of a charging / discharging controller in an autonomous system such as a photovoltaic system or wind turbine needs no more to be discussed. It must be done very carefully in order to meet the requirements for reliability, simplicity, portability and cost. Additional constraints imposed on the controller such as the possibility of varying the parameters of the control algorithm and display the battery charge level, increase its complexity and lead us to opt for a smart solution based on microcontrollers. This paper presents the different development steps of a battery controller for wind turbine applications, operating under the control of the microcontroller PIC16F877A
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