Hitachi Energy Deploys MicroSCADA Pro System for 52 MW Solar Plant in Thailand’s Lopburi Region

Hitachi Energy has completed the delivery of a comprehensive MicroSCADA Pro monitoring and control system for a 52-megawatt (MW) thin-film solar photovoltaic (PV) power plant in central Thailand’s Lopburi province. The project was developed by Serm Sang Palang Ngan Co., Ltd. as part of the country’s growing push toward utility-scale renewable energy.

The new solar plant is located in one of Thailand’s most solar-rich regions, with Equatorial Thailand continuing to attract investment in clean energy. According to the Ministry of Energy, as of December 2014, 294 solar farms were selling a combined 1.32 gigawatts (GW) of electricity to the national grid, with another 296 MW under contract but not yet operational.

Centralised SCADA System to Maximise Performance

Serm Sang Palang Ngan sought a single SCADA (Supervisory Control and Data Acquisition) solution capable of monitoring and managing all assets across the plant—from the PV modules to the 115-kilovolt (kV) substation—to optimise performance and ensure high reliability.

Hitachi Energy responded with its MicroSCADA Pro system, delivering complete plant-wide control and data acquisition. The scope of supply included string monitoring, solar inverters, RTU540 remote terminal units, and multiple layers of protection relays: Relion RED670 for line differential protection, REF630 for feeder protection, and RET630 for transformer protection. A third-party meteorological module was also integrated for weather data inputs.

Servers were deployed at critical nodes across the installation, with a central server ensuring data redundancy and real-time analytics. The system enables full monitoring of substation equipment, switchgear, PV arrays, and inverters.

Enhanced Reliability and Predictive Maintenance

Hitachi Energy’s SCADA platform is designed to calculate performance ratios and issue real-time failure alerts, allowing operators to immediately address malfunctions. By automating the monitoring of primary and secondary components, the system supports predictive maintenance strategies. It also integrates with weather sensors to maintain peak operating efficiency under changing environmental conditions.

According to Hitachi Energy, the centralized monitoring solution reduces downtime risks and helps plant operators maintain a stable energy supply. The system is expected to play a key role in operational planning and maintenance scheduling.

Continued Presence in Thailand’s Renewable Sector

The project follows Hitachi Energy’s previous deployment of a similar control system for a 73 MW solar plant in the Lopburi region for the same customer. The company has operated in Thailand for over a century and continues to deliver digital and automation solutions supporting the country’s energy transition.

Hitachi Energy’s MicroSCADA Pro platform is widely used in both utility and industrial settings, offering integrated control, real-time insights, and connectivity across energy infrastructure networks.