Closed Loop Control Implementation of Swiched Boost Inverter for PV Applications with AC/DC Loads

Abstract

Renewable energy technologies are clean sources of energy that have a much lower environmental impact than conventional energy technologies. In the field of renewable energy after boosting operation, for converting DC to AC voltage for feeding load, inverters plays vital role Due to many limitations faced by Conventional voltage source inverter,Z-SourceInverter became popular by preventing the limitations due to its by providing LC impedance network connected between source and load Thereby this inverter can be used for Buck/Boost operation. But presence of LC impedance made the system bulky and not suitable for low power application. This causes the introduction of Switched Boost inverter, which exhibits similar advantages of ZSI with less number of passive elements. This paper proposes closed loop control of switched boost inverter for PV applications with less cost and reduced size. The closed loop control enhances the efficiency of SBI and it also shows fast response to the voltage given as reference. SBI has unique features of buck/boost operation along with AC/DC inversion. This feature is embedded in this topology due to the presence of impedance network in the input side of SBI.

Real-Time Implementation for the Robust Controller of the Switched Boost Inverter within an Autonomous Modified Nanogrid

“…Several additions, such as those in [8]- [11], were applied to improve its performance. The authors also proposed a fairly difficult control technique for the closed-loop SBI in [12] and [13] to validate its suitability for applications of the DC nanogrid. In [14], the authors developed an extremely sophisticated d-q model to manage the SBI voltage output.…”

Closed‐loop control of a single‐stage switched‐boost inverter in modified DC‐interconnected nanogrids

“…Furthermore, the authors in [12] and [13] presented a very complicated closed‐loop control technique for the SBI to confirm its suitability for DC nanogrid applications.…”

“…Adda et al in [14] also used a very complex d ‐ q frame model to control the AC output voltage of the SBI. To raise the inverter output AC‐voltage, authors in [12] proposed a step‐up transformer that increases the iron and copper losses and hence the total cost.…”