Variable Parameters for a Single Exponential Model of Photovoltaic Modules in Crystalline-Silicon

Abstract

Abstract:The correct approximation of parallel resistance (R p ) and series resistance (R s ) poses a major challenge for the single diode model of the photovoltaic module (PV). The bottleneck behind the limited accuracy of the model is the static estimation of resistive parameters. This means that R p and R s, once estimated, usually remain constant for the entire operating range of the same weather condition, as well as for other conditions. Another contributing factor is the availability of only standard test condition (STC) data in the manufacturer's datasheet. This paper proposes a single-diode model with dynamic relations of R p and R s . The relations not only vary the resistive parameters for constant/distinct weather conditions but also provide a non-iterative solution. Initially, appropriate software is used to extract the data of current-voltage (I-V) curves from the manufacturer's datasheet. By using these raw data and simple statistical concepts, the relations for R p and R s are designed. Finally, it is proved through root mean square error (RMSE) analysis that the proposed model holds a one-tenth advantage over numerous recently proposed models. Simultaneously, it is low complex, iteration-free (0 to voltage in maximum power point V mpp range), and requires less computation time to trace the I-V curve.

A New Simplified Five-Parameter Estimation Method for Single-Diode Model of Photovoltaic Panels

“…Multiple studies in the literature present methods to extract these parameters for the single-diode model and Chin et al [15] presented a review on existing models. There are many types of methods and they are based on experimental [16,20,35,37], numerical, and optimization techniques [17][18][19][22][23][24][25][26][27][28][29][30][31][32][33][34]36,[38][39][40][41][42][43][44]47,49] or combinations of these [21,45,46,48].…”

Non-Iterative Methods for the Extraction of the Single-Diode Model Parameters of Photovoltaic Modules: A Review and Comparative Assessment

“…The five parameters depend on both the structural characteristics of the PV modules and the operating conditions: incident irradiance and cell temperature. The irradiance is usually considered to affect proportionally I ph [1][2][3][4]7,20,21,27,28,36,43,[49][50][51][52][53][54], and R sh in an inversely proportional way [1][2][3][4]20,27,36,43,49,51,52,54]; the temperature effect is generally assumed to be weak and linear in I ph , strong and exponential in I s , and strong and proportional in a [1][2][3][4]7,20,21,27,36,43,[49][50][51][52][53][54]. The dependence of R s is somewhat unclear, some studies assuming to remain constant [2][3]…”

“…This class achieves generally high accuracy but suffers from initialization and convergence issues, high calculation cost and solution suboptimality [1,[11][12][13]. The non-iterative (or explicit or direct or analytical) methods employ a set of equations as well, but are solved symbolically/explicitly (no iterations) resulting in simpler formulation and implementation [12,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. These approaches are essentially variations of the numerical class that employ a series of simplifications and empirical observations to achieve explicit formulation.…”

An Overview of the Photovoltaic Industry Status and Perspective in China

“…The upstream is the silicon material and the silicon wafer; the middle is the cell and modules; the downstream is the application system. From a global perspective, the number of enterprises involved in the six links of the industrial chain has increased substantially, and the industrial chain of the photovoltaic market has a pyramid structure [7], [34]- [36]. In 2017, China's photovoltaic manufacturing industry experienced rapid growth.…”