The development renewable energy uses is increasing, including micro-hydro power plants. A micro hydro power plant technically works by utilizing the height of the water fall, water discharge and water pressure. This energy is converted into mechanical energy by rotating the turbine shaft, after which the mechanical energy on the turbine shaft is transferred to the transmission and then connected to a generator to be converted into electrical energy. Due to the power losses created and the time factor, a micro hydro power plant needs regular checking or monitoring. However, conventional micro hydro power plants are still checked manually. So from the above problems, research was carried out in the form of designing a monitoring system for voltage, current and frequency in micro-hydro power plants based on the Internet of Things (IoT). From the monitoring of voltage, current and frequency, it is hoped that the actions will be taken and when the maintenance will be carried out. This design is done by designing software and hardware. Hardware includes the ESP32 microcontroller board which is used to read and process voltage, current and frequency sensor data from the PZEM-004T v3 sensor module and remotely control solid state relay (SSR relay). Then, software design such as the Internet of Things (IoT) is carried out using the Ubidots platform and connected to the internet via a Wi-Fi connection for monitoring and notification via Telegram messages. In the monitoring system testing, notification and control of SSR relays were obtained from the results of sending data to Ubidots and the success of sending SSR relay notifications and controls. Data transmission, notification and SSR relay control has a 100% success.

Unit 5 and Unit 6 requires a flow rate control system so that there is no excess flow rate and minimize the deficiencies that occur. Therefore, the flow rate control system requires a set point value as the control limit. Control is generally used in the industrial sector, namely PID control. In this control system there are weaknesses, namely the control process is still carried out by trial and error and currently many are done manually by trial and error or trial and error methods so the results are not necessarily correct and you have to do various kinds of experiments to get the value and response well. To solve the problems that occur, it is necessary to do mathematical modeling of a plant in order to obtain a transfer function and an alternative approach is needed to obtain a better, faster, and ideal system value for carrying out the control process. The method used in the PID (Proportional-Integral-Derivative) control system is the Ziegler-Nichols method. The method in this study aims to maintain the stability of the flow rate system on the Backwash Pump filter according to the desired set-point. According to the simulation and analysis results, it is known that by using the Ziegler-Nichols setting calculation method, the value of