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Avoid network operator limits and install renewable generators of any size you want – using EMMA GVS.
Managing export limits
A customer in Kinvarra, Co. Galway is the first owner of a 13.7 kW Proven 35-2 wind turbine to have an EMMA GVS installed. The EMMA GVS allows the customer to connect his wind turbine to the grid on single phase and still receive his feed-in-tariff payments from ESB for 6kW/hour export.
ESB gave the go ahead for the turbine with the condition that it had the EMMA GVS to limit export to the grid to 25 amps.
Using wind energy to heat house and hot water
When this export limit has been reached, EMMA GVS sends any additional power to an immersion heater in a 1000 litre buffer tank which supplies the hot water and central heating, so preventing over-export to the grid. When the tank reaches its desired temperature, EMMA sends power to a further a bank of dump loads. In other words, EMMA is able to heat both the house and the hot water:
The EMMA GVS is programmed to heat the tank to 85°C and then switch over to the bank of dump loads which are three resistive convection heaters making a 9 kW load. At this point the EMMA GVS will balance an export of 25 amps (5.75kW at 230v) (which will provide feed-in tariff payments for the owner) and send the excess power to the dump loads.
Bypassing NC6 regulations
In this case EMMA GVS allows the connection of a larger turbine to the grid than under the NC6 regulations. The advantages to the owner are:
Preventing over voltage trips
Another crucial task that EMMA GVS does here is to protect the wind turbine system from outages due to over voltage. Over voltage trips occur when the voltage on the grid is high (253v). This trips out the inverters and means a loss of valuable power, typically in windy conditions.
EMMA GVS prevents this occuring by sending more power to the heating as the voltage approaches 253 volts. By using more of the power available from the turbine the Grid voltage can be stabilized to prevent the inverters tripping out and losing out on valuable power.
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