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Export control and inverter stability with EMMA (with graphs).
The following graphs are taken from an EMMA test site near Kilmarnock in Scotland. The test site comprises:
The EMMA with EC unit performs three main functions:
These functions are demonstrated in the graphs below.
Graph 1: EMMA Preventing Inverters from Tripping
The first graph below shows EMMA putting tiny pulses of power into the heaters to prevent the voltage rising above 254 volts and thereby prevent the inverters from tripping (see the solitary dark red line half-way up graph).
Without this control the inverters would have been tripping continuously, and the turbine output (and FIT payments) would have been very much reduced.
Graph 2: EMMA’s GVS function in Action During a Storm
The graph below shows EMMA’s GVS function operating perfectly during a storm – or nearly perfectly, this was before its Grid Voltage Stabilisation cascade function had been enabled.
Graph 3: Inverter Stability With and Without EMMA’s GVS Function
The graph below shows
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