Grid integration of large-scale PV plants: dealing with power fluctuations

Grid integration of large-scale PV plants: dealing with power fluctuations

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This chapter will study the dynamics of irradiance and the power delivered to the grid by PV plants in time frames of less than 10 min, paying particular attention to the influence of PV plant size and geographic dispersion on magnitude and duration. We are now going to present some general models which make it possible to simulate the power fluctuations of either a power plant or a group of power plants, based solely on irradiance measurements. Finally, we shall study the control strategies required to compensate these fluctuations, based on storage systems installed in the PV plants, analysing the energy and power requirements to compensate these variations.

Chapter Contents:

  • 5.1 Introduction
  • 5.2 The photovoltaic observatory
  • 5.3 Irradiance and power output fluctuations in large PV plants
  • 5.3.1 At a PV plant level
  • Irradiance fluctuations
  • Power fluctuations
  • 5.3.2 Power fluctuations at a PV plant group level
  • 5.4 Simulating power fluctuations at PV plants
  • 5.4.1 PV plant model
  • 5.4.2 Model of a group of PV plants
  • 5.5 Smoothing power output fluctuations by using energy storage systems
  • 5.5.1 The worst fluctuation model
  • 5.5.2 Conventional ramp-rate control
  • 5.5.3 Power Ramp-Rate control based on the PV power plant model
  • References

Inspec keywords: photovoltaic power systems; power grids; power system control

Other keywords: PV plant size; control strategy; storage systems; large-scale PV plants; grid integration; geographic dispersion; irradiance measurements; power fluctuations

Subjects: Solar power stations and photovoltaic power systems; Power system control; Control of electric power systems

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