MGM Transformer Company

MGM makes transformers for solar applications

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Courtesy of MGM Transformer Company

Scientists have high confidence that global temperatures will continue to rise for decades to come, largely due to greenhouse gases produced by human activities. The Intergovernmental Panel on Climate Change (IPCC), which includes more than 1,300 scientists from the United States and other countries, forecasts a temperature rise of 2.5 to 10 degrees Fahrenheit over the next century. Increasing the supply of renewable energy would allow us to replace carbon-intensive energy sources and significantly reduce US global warming emissions. One such source available for us is Solar energy.

At MGM we have identified this need and have been supplying transformers for application in Distributed Photovoltaic (DPV) Power Generation Systems – aka, Solar Energy. In DPV Power Generation Systems electrical power is generated by converting solar radiation into direct current (DC) electricity using semiconductors that exhibit photovoltaic (PV) effect. Photovoltaic power generation employs solar panels comprising a string of photovoltaic modules (cells) containing a photovoltaic material, often made of silicon. The PV module can typically generate a combined dc voltage of up to 1100V (DC).

The generated DC voltage is then converted to a three-phase AC voltage using a three-phase inverter. The inverter is subsequently connected to a DPV system inverter transformer for distribution of alternating current (AC) energy.

Below are Transformer Selection Parameters:

  1. Rated output kVA:
    • Based on inverter output ratings, load diagram, harmonic content, weather patterns and unusual service conditions
  2. Nominal Voltage:
    • Designed for Inverter Transformer to be compatible with Pulse voltage shape of inverters
  3. Winding connection diagram and vector group:
    • Inverter operation is not affected by vector group like Dy1, Dy5 or Dy11
    • No Neutral required on Primary LV side
    • Isolated neutral point on Secondary HV side transformer
  4. Electrostatic Shield (ES):
    • Recommended installation of ES between primary and secondary windings to minimize potential transfer of high frequency voltage disturbances (harmonics, pulses, surges) from primary to secondary
    • Windings typically connected to inverter circuits are ungrounded

MGM fully complies with C57.159 – 2016 IEEE Guide for application in DPV Power generation Systems.

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