Abstract
As new grid codes have been created to permit the integration of large scale photovoltaic power plants into the transmission system, the enhancement of the local control of the photovoltaic (PV) generators is necessary. Thus, the objective of this paper is to present a local controller of active and reactive power to comply the new requirements asked by the transmission system operators despite the variation of ambient conditions without using extra devices. For this purpose, the control considers the instantaneous capability curves of the PV generator which vary due to the change of solar irradiance, temperature, dc voltage and modulation index. To validate the control, the PV generator is modeled in DIgSILENT PowerFactory ® and tested under different ambient conditions. The results show that the control developed can modify the active and reactive power delivered to the desired value at different solar irradiance and temperature.
Highlights
As more large scale photovoltaic power plants (LS-PVPPs) are being installed, the electrical system can face some challenges related to four key areas: (i) active power control, (ii) reactive power control, (iii) voltage support and (iv) frequency support [1]
According to the grid codes presented by Puerto Rico, Romania, South Africa and Germany, the active power management for LS-PVPPs should consider: power curtailment, ramp rate control and active power reserves (Figure 1) [2,3,4,5]
This paper has presented the control of active and reactive power for a PV generator considering its capability curves variation applied in a large scale photovoltaic power plant
Summary
As more large scale photovoltaic power plants (LS-PVPPs) are being installed, the electrical system can face some challenges related to four key areas: (i) active power control, (ii) reactive power control, (iii) voltage support and (iv) frequency support [1]. Puerto Rico requires that these PVPPs behaves similar to conventional power plants despite the intermittent conditions [2]. Considering these changes on the grid codes there are two key aspects necessary to approach: active and reactive power control. Called as absolute control or limiting control, addresses the reduction of the possible active power that the power plant can generate during the day depending on the grid requirements [6].
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