A transformerless inverter is the latest product to supplement the Sinvert series of solar inverters from the Siemens Industry Automation division. Compared to units with transformers, the new three-phase photovoltaic inverters achieve efficiencies that are up to 2% higher; namely, 98% in a master-slave combination according to Euro-Eta.
System costs can be reduced with the option of a voltage window increased from 900 to 1000 V. In this case, for example, a number of photovoltaic (PV) modules are linked together in a chain and fewer generator terminal boxes and smaller conductor areas are needed. The new inverter series also includes units with graduated ratings of 500, 1000 and 1500 kW and also 2 MW.
The new central inverter units satisfy the currently effective medium-voltage regulations and can be used either as a standalone solution or in combination. The master-slave principle with ‘rotating master’ is an advantage in the event of changing intensities of solar radiation in the course of the day or in case of cloudiness.
Depending on the degree of radiation, the necessary inverters are energised or de-energised by means of a process whereby only the required number of inverters is operated subject to light intensity. The connection of as many as four inverters in the form of a master-slave system enables the plant to start already at low levels of solar radiation and to achieve very high efficiencies even in the low output range. The rotating master contributes to the long useful life of the system, as the inverter unit with the lowest operating hours is always controlled as master and therefore the operating time distributed uniformly among the inverters.
For more information contact Siemens, +27 (0)11 652 2000.
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