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

• Published in: International journal of circuit theory and applications Vol. 51; no. 5; pp. 2327 - 2350
• Main Authors: Battula, Santhoshkumar, Garg, Man Mohan, Panda, Anup Kumar, Senapati, Laxmidhar
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01.05.2023
• Subjects: bidirectional converter; Control systems; DC‐DC converter; Electric potential; Energy management; Energy storage; Feedback control; Feedforward control; impedance source converter (ZS); Liapunov functions; Lyapunov control; Photovoltaic cells; photovoltaic system (PV); Renewable energy sources; renewables; Voltage
• ISSN: 0098-9886; 1097-007X
• DOI: 10.1002/cta.3518

Summary 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. This article proposes a bidirectional quasi Z‐source DC‐DC converter to connectenergy storage with a PV connected system. Research subjects include renewable energy control and management. The problem is managing renewable energy, distributed energy storage, and loads. This article analysesBQZSDC with a Lyapunov‐based controller for regulating DC link voltage. The controller has feedforward and feedback units. The feedforward unit reduce burden on the feedback controller. The feedback controller makes the closed‐loop system exponentially stable and provides good transient response.