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Power Gen Controls for St. Eustatius Solar/Diesel Hybrid Project


The customer's goal was to reduce the island's fossil fuel usage and establish a grid stabilizing energy supply based on renewable energies. The utility power plant supplies the power to the island of St. Eustatius and consists of 8 Caterpillar engines. Five are Caterpillar 3408 engines with generators rated at 450 kW, using Woodward EG3PC and 2301A LSSCs controls. The other three units are Caterpillar 3512 (Unit 7) and 3516B HD (Units 8 and 9).

  • Power Management
  • Caterpillar CAT D-3512B Engines
  • Woodward easYgen 3100/3200 Genset Control for Multiple Unit Operation

  • The easYgen-3000 Series genset management controls with numerous inputs and outputs and a modular software structure designed for a wide range of applications. This includes stand-by, AMF, peak shaving, import-export, co-generation or distributed generation, among others. The easYgen-3000 Series is compatible for island, island parallel, mains parallel and multiple unit mains parallel operations and is able to control up to 32 gensets connected in a network with automatic sequencing

GCS designed and supplied a new control cabinet with Woodward easYgen 3100 generator controls and associated remote panels for the purpose of upgrading several units to integrate the solar power site to the island's power plant. These units work in concert with an SMA fuel save system that allows the diesel engines to work efficiently with a newly built solar farm on the island. GCS worked closely with SMA to complete the upgrade system, commission the units and interface the SMA fuel save control with the easYgen's according to the customer requirements. The 1.89 MWp PV farm helps save more than 800,000 liters of diesel fuel a year on the island.

The original synchronizing system was a Speed Matching Synchronizer and a Woodward Load Sharing Module on each engine. The new easYgen 3100 controls provide automatic synchronizing and load-sharing, are fully customizable and designed to work with future implementations of fuel saver systems. Using CANbus to communicate with the easYgens, they receive/send parameters to determine which generator should come online/offline next. The order in which the generators come online/offline is performed by the easYgen, which gives the flexibility of relying on the generators whenever the solar system cannot produce enough power for the grid.

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