Real-time Analysis of Inverter Performance via SCADA Haiwell Online Monitoring

Abstract

An inverter is the main component of an on-grid solar system. It converts DC power from solar PV to AC power to serve the electric load. Besides, it is used to find the maximum power point tracking and regulate the electric power from the main power and backup. This research discusses the development of an online inverter 40 kW monitoring system on the 38 kWp rooftop solar system at Pamulang University. The existing inverter monitoring system is by iSolarCloud application. This monitoring system can be accessed from the local area by scanning a QR code and Bluetooth connection. This system provides several output parameter information of the inverter, such as voltage, current, and power generation. The SCADA Haiwell has been used to construct the monitoring system. This system consists of the Programmable Logic Controller (PLC) Haiwell AC10S0R, Human Machine Interface (HMI) C7S-W, and Haiwell cloud application. The PLC reads the data from the input and output inverter by Modbus TCP/IP communication. The result of the monitoring system provides more parameters on both sides of the inverter input and output data. The Input side parameters include DC voltage, current, and DC power. The Output side parameters include AC voltage, current, grid frequency, active power, reactive power, daily yield power, total yield power, and efficiency of the inverter. The system's accuracy has been validated by comparing the HMI data, SCADA Haiwell Cloud and iSolarCloud readings. From the testing, this monitoring system is valid for monitoring the inverter performance online (mobile phones or PC).