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Hybrid Systems
Remote wind power systems often incorporate additional generating systems such as diesel generators and solar arrays. These "hybrid" systems provide improved reliability of power supply and operational flexibility. When When the power from the wind turbine is not sufficient to operate the load, the alternate power source comes on-line. The alternate source is used far less frequently in a hybrid system than if the wind system were not present.

Hybrid photovoltaic systems most commonly take the form of photovoltaic systems combined with wind turbines or diesel generators. They would most likely be found on islands, yet they could also be built in other areas. The largest European PV system used as a part of the hybrid system is located on Pellworm Island in Germany. A very large hybrid system was also built on the Canary Islands. The following descriptions depict some of the world most interesting PV-wind or PV-diesel hybrid systems.

If you wanted a wind system for a remote site a decade ago, the dealer would happily oblige, sizing the wind turbine and the batteries to carry your entire load. That's not the case today. Both Bergey Windpower and Northern Power Systems, two small wind turbine pioneers, have successfully demonstrated wind and solar hybrids at remote telecommunications stations. These hybrids capitalize on each technology's assets.

Khythnos Island:

The Kythnos Island hybrid system plant utilizes a 100 kW PV array, a 100 kW wind turbine, and a 600 kWh battery. The entire system is connected to the existing distribution grid, which is fed by a 200 kVA diesel generator. Three 50 kVA inverters operate simultaneously delivering power into the grid. The plant is monitored by control system, which optimises the amount of renewable energy available to the grid.

Pellworm Island:

The largest European PV wind hybrid system is located on the Pellworm Island in Germany. The PV array has the capacity of 600 kW, yet it will be enlarged with an additional 300 kW array. The first 300 kW array was build in 1983. The total PV power of 900 kW will enable the production of nearly 800 Mwh/year.

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