A DSP-based differential boost inverter with maximum power point tracking

Abstract

This paper presents a DSP-based differential boost inverter (DBI) with maximum power point tracking (MPPT) for photovoltaic (PV) applications. In a conventional DC/AC MPPT system, power of photovoltaic is delivered into two stages, they are DC/DC boost converter and buck type DC/AC inverter. A DC link capacitor appears between these two stages. Furthermore the system has higher complexity and costly than that of DC/AC MPPT system with a single stage boost inverter. Here, a single stage differential boost inverter is implemented. Since it can produce a sinusoidal output voltage higher than its DC voltage input, it is not only able to reduce the stage number of DC/AC MPPT system but also able to eliminate the DC link capacitor. The MPPT method employed in this study is P&O method. This technique is widely used due to its easy implementation, and unimportant extreme weather change consideration. To implement this technique, a digital signal processor (DSP) was used. In this paper, a review of DBI and MPPT implementation are presented. Finally a 400 W laboratory prototype has been built. The result shows that the P&O MPPT method has been successfully implemented for various PV power and it can reach 95% maximum MPPT accuracy. In addition, the DBI is able to produce a sinusoidal output voltage at the various PV power conditions.

Research on Advanced Control Method of Multiple Photovoltaic Strings Input Type Recognition

“…By using the multi-string input mode, the deficiency of the independent connection mode can be avoided. Each string is connected to the DC-DC converter for the control purpose, therefore ensuring the high-efficiency power generation and reducing the effects brought by shadings, and it becomes the new trend of research and application of distributed PV power generation (Chen et al, 2007;Gonzalez et al, 2007;Fortunato et al, 2008;Veerachary, 2008;Soleimani et al, 2012;Abdalla et al, 2013;Rosli et al, 2014a;Rosli et al, 2014b;Haghighian and Hosseini, 2015;Moon et al, 2015;Tampubolon et al, 2015;Sochor and Akagi, 2016;Chander and Kumar, 2017;Abe et al, 2020;Bodele and Kulkarni, 2020;Mao et al, 2020;Zhang and Jiang, 2020;Ahmed et al, 2021). However, the existing research and applications mainly focus on circuit topologies and maximum power point tracking (MPPT) control algorithms, which are based on the fact that the connection mode is known in advance.…”

Optimal Design of Integrated Magnetics for Differential Rectifiers and Inverters

“…B1dm = B2dm = Bcdm = 0.9Bsat. For a given ϕcdm and Bsat, (5) and (6) specify the minimum dimensions of the core. Clearly, a larger inductor current ILm produces a higher ϕcdm which hence requires larger core dimensions and volume.…”

“…The inherent features of such differential type of converters are (i) there bridgeless structure which indicates high power efficiency for high power applications, (ii) possibility of direct capacitor that has a short service lifetime) without adding extra components, and (iv) low leakage current between the AC and the DC side [1]- [9]. Due to these features, differential rectifiers/inverters have been extensively reported and applied in many applications, e.g., LED driving [2], uninterruptible power supplies (UPSs) [3], fuel cell and photovoltaic (PV)-based inverters [4], [5]. Despite the advantages, a differential rectifier/inverter typically requires the use of two bulky low-frequency inductors either at the AC side or at the DC side of the converter, which significantly reduces the power density of the system.…”