Bidirectional quasi‐Z‐source DC‐DC converter with Lyapunov function‐based controller in stand‐alone photovoltaic‐connected system

Abstract

This article proposes a bidirectional quasi-Z-source DC-DC converter (BQZSDC) to integrate distributed energy storage system with a stand-alone photovoltaic (PV)-connected system. The operational challenges like control and energy management of the renewable-driven stand-alone systems have been an interest of research. However, the challenge is managing the renewable energy source and the distributed energy storage system and simultaneously catering to the loads. This article analyzes the performance of a BQZSDC with a Lyapunov function-based controller for regulating DC link voltage (load voltage) and battery current. A duty-ratio feedforward control unit and a Lyapunov function-based feedback control unit are used to develop the controller. The duty-ratio feedforward control unit is used to reduce the burden on the feedback controller. The closed-loop system is exponentially stable with the feedback controller, offering excellent transient responsiveness even under large disturbances. Simulations in MATLAB/Simulink show that the controller functions satisfactorily in achieving regulation objectives. Finally, experimental results validate the performance of the proposed controller.

An extendable multicell quasi Z‐source converter topology using an active switched network

“…The topologies in Hosseini et al, Kumar et al, and Kumar and Veerachary [27][28][29] have employed switched capacitors to reach extra boost ability without using any additional switch. The paper by Battula et al 30 presents a bidirectional QZS DC-DC converter designed to integrate distributed energy storage with a standalone PV system. Liu et al 31 proposed a new topology based on the QZSC by adding a switch and a diode to the output of the QZS topology to reach a high voltage boost with fewer components.…”