A generic transient PV system model for power quality studies

A State-Space Dynamic Model for Photovoltaic Systems With Full Ancillary Services Support

“…The detailed switching model of the PV system proves far too complex and time-intensive for power system studies [4]- [6]; in these cases, equivalent dynamic models are used instead, aiming to represent the aforementioned dynamics at a much lower complexity [5], [6]. These models treat the entire PV plant as a single generator, as there is no need for higher granularity and separate modeling of each component [7]- [10].…”

“…These models treat the entire PV plant as a single generator, as there is no need for higher granularity and separate modeling of each component [7]- [10]. Furthermore, average-value equivalents are always employed for the power converters that prove sufficient for the time scale of these dynamics, neglecting the switching phenomena only [4]- [6]. Apart from these two common assumptions, the available PV dynamic models in the literature employ several other debatable simplifications in both the power circuit and control structure.…”

“…With regards to the power circuit modeling, some studies neglect the dc-side dynamics [6], [7], [9], [11], including the Western Electricity Coordinating Council's (WECC) model [9]; however, this simplification does not allow for representation of dc-link and irradiance-driven dynamic phenomena [12], [13]. As for the PV array, most of the relevant studies consider a simplified model [4], [8], [12]- [19], the full single-diode PV model being used only in [5], [20]- [22], involving numerical solution algorithms that pose calculation issues [5].…”

“…), a condition that decisively alters the dynamic response of the system; this paper shows that both CCM and DCM should be considered in models with ancillary services support. As for the grid-side filter, recent studies conclude that any type (L, L-C or L-C-L) can be sufficiently represented by an equivalent inductance L for the purpose of dynamic simulations [6], [17], [22].…”

An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation

“…The conventional approach for this analysis using a full EMT modelling approach for the PV systems would be very slow. An alternative approach to reduce computational resources and maintain accuracy for fast transient events is to model the PV systems with linear, average PV system models expressed in the dq0 reference frame [24][25][26][27]. Due to linear approximation of the highly nonlinear behaviour of the PV array generator [28] and step-up DC/DC converter [29] these models are only accurate in the region of the chosen linearisation point (normally maximum power point operation) for a specific irradiation and temperature.…”