Hybrid PV Diesel power generator: design criteria and preliminary performance analysis

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Hybrid PV Diesel power generator design
criteria and preliminary performance analysis

• Michele Guerra, Angelo Sarno ENEA Centro
  Ricerche Portici
• Riccardo Morici, Sergio Zanarini Elettronica
  Santerno SpA

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Presentation Summary

• Distributed energy production
• The Hybrid PV-Diesel generator of Monte Aquilone
• The monitoring system
• Energy dispatching politics
• Preliminary evaluation tests
• Future perspectives

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Distributed energy production

• PV power is the preferred source for renewable
  low power distributed production
• Traditional PV plants cannot fulfill user needs
• Excess energy storage
• Un-interruptible operation
• Stand-alone and grid connected modes of
  operations
• Free of maintenance or remote maintenance
  possible

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The Hybrid PV-Diesel generator of Monte Aquilone
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Functional block schematic
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Main functional performances

• Full automatic operation by means of embedded
  energy dispatcher controller
• Variable speed variable torque operation of
  diesel engine for maximum efficiency
• Only the required non renewable power quota is
  produced to support loads, batteries are not
  recharged with diesel engine
• Complete supervision system for system status
  display, data logging and remote maintenance

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Main specifications
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The monitoring system
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Energy dispatching politics

• Incoming PV power is delivered to load, the
  excess to the battery
• If the PV power is below load power and battery
  are not discharged the power difference is
  supported by batteries.
• If the PV power is below load power and battery
  are fully discharged, the power difference is
  produced by diesel engine.
• When battery discharge is not allowed the load
  power is supported by PV field and diesel engine
  with PV field priority.

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Simplified dispatcher controller block diagram
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Preliminary evaluation tests

• Response to a daily load profile

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Conclusion and perspectives

• An Hybrid PV-Diesel generator was presented
• An efficient energy dispatching politic was
  identified
• Preliminary experimental data shows efficient
  integration of renewable and not renewable
  sources and good dispatcher behaviour
• Long-term efficiency will be demonstrated by
  further test now in process.