Abstract
This paper presents a novel comprehensive discrete-time model of a three-phase single stage grid-connected photovoltaic generation system. The detailed model is carried out on synchronous reference frame. It is shown that both converter's AC and DC-side discrete time model differs from the continuous time one. The main differences are the AC-side current and voltage cross coupling, and the DC-side voltage non-minimum phase behaviour for small active power injected into the grid. Based on the new model, digital internal current and external DC-link voltage controllers are designed. Experimental results show that the proposed controllers provide fast transient response and disturbance rejection. Small errors obtained comparing experimental and simulation waveforms for both DC-side voltage and AC-side current corroborate to validate the model and the designed controllers.
Original language | English |
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Pages (from-to) | 162-168 |
Number of pages | 7 |
Journal | Electric Power Systems Research |
Volume | 150 |
Issue number | 1 September 2017 |
DOIs | |
Publication status | Published - 1 Sept 2017 |
Keywords
- DC-side voltage control
- Digital controller
- Discrete-time modelling
- Grid-connected
- Photovoltaic systems