DEVELOPMENT OF POWER ACTIVE FILTER CONTROL DEVICE ON ESP32 PLATFORM

This work deals with the development of a control device for an active filter based on an ESP32 microcontroller. The main goal of the development is the effective compensation of harmonic distortions in electrical networks that arise under the influence of non-linear loads. The paper describes in detail the circuits of voltage and current sensors used to monitor network parameters, as well as their integration with ESP32 for data collection. Voltage and current sensors play a key role in ensuring the accuracy of filter control. Their circuits include precision resistive dividers to measure voltage and Hall sensors to measure current. As a result of receiving signals from these sensors, an analog signal is generated, which is converted into a digital one using the built-in ESP32 ADC. Special attention is paid to the analysis of signal diagrams from sensors that demonstrate changes in electrical parameters in real time. This ensures quick response of the system to changes in the load and effective control of the active filter. ESP32 performs the generation of a PWM signal, which serves to control the inverter of the active harmonic filter. The work considers the methods of generating PWM signals that ensure the minimization of harmonic distortions in the network. The generation of PWM signals takes place using a 16-bit generator, which allows for high accuracy and smooth control of voltage and current with the help of an inverter. Features of setting the frequency and pulse width for adaptation to changing operating conditions of the active filter control device are also given. The algorithm for converting signals from sensors is based on high-speed reading of analog signals, their filtering and processing to form control actions. To ensure the operation of the power active filter control device, software code is used, which allows the system to simultaneously read data, generate a control signal and monitor network parameters. The results of this study can be used in industrial systems and household networks to improve the quality of electrical energy by actively compensating harmonic distortions.