Intersolar Europe 2012: Controlling solar power plants with MaxWeb NX pro from SolarMax13. June 2012 | By: SolarMax
The new SolarMax solar plant controller MaxWeb NX pro allows for controlling the active and reactive powers directly at the grid feed point for the first time - not at the inverter as up to now.
This way, the solar plant controller meets the requirements of the grid operators regarding state-of-the-art feed-in management for large solar parks.
According to the EEG (Renewable Energies Act), solar power plants are required to provide an active contribution to the stability of the public power supply and to allow the grid operator to temporarily reduce the fed-in active power if required (EEG feed-in management). Additionally, for newly built solar parks some grid operators require that reactive and active powers are controlled directly at the feed point since January 2012. In order to equip PV plants for these requirements, the new SolarMax solar plant controller MaxWeb NX pro is ideal, controlling the inverters of the plant so that these feed into the public power grid according to the specifications of the grid operator.
The grid operators normally control large solar parks with the help of a SCADA system (Supervisory Control and Data Acquisition). This way, MaxWeb NX pro is provided with the required target specifications of the grid operator and compares these to the current actual values at the grid feed point. Now, the device controls the cos-φ value, reduces the active power, provides for compliance with the reactive power specification, and controls the circuit breakers, amongst others.
"The further the expansion of photovoltaics proceeds, the more important it is to guarantee precise control of the grid feed-in, particularly for large solar parks. We developed the MaxWeb NX pro solar plant controller so that it is designed for continuous operation and works maintenance-free even at extreme temperatures of -40°C to +70°C," says Rudolf Bühler, senior Product Manager Data Communication at SolarMax. "The MTBF value, i.e. the expected operating time between two consecutive failures, is approx 22.5 years. This way, both the plant and the grid operator are provided with continuous output and, thus, high reliability regarding grid feed-in."
On the basis of the diverse interfaces, the functions of MaxWeb NX pro can be extended easily and can be adapted quickly for future requirements as well.
ou will get more information about the SolarMax communication tools from 13-15 June at the Intersolar in hall C4 / booth 110.