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Design of PI sliding mode control for Zeta DC-DC converter in PV system

Hasanah Rini Nur, Ardhenta Lunde, Nurwati Tri, Setyawati Onny, Sawitri Dian Retno, Suyono Hadi, Taufik Taufik

Bulletin of the Polish Academy of Sciences. Technical Sciences

2022

Vol. 70, nr 3

art. no. e140952

Solar energy has become one of the most potential alternative energies in the world. To convert solar energy into electricity, a photovoltaic (PV) system can be utilized. However, the fluctuation of sunlight intensity throughout the day greatly affects the generated energy in the PV system. A battery may be beneficial to store the generated energy for later use. A DC–DC converter is commonly exploited to produce a constant output voltage during the battery charging process. A Zeta converter is a DC–DC converter which can be used to produce output values above or below the input voltage without changing the polarity. To deal with the inherent non-linearity and time-varying properties of the converter, in this paper the sliding mode control (SMC) is first analyzed and exploited before being integrated with a proportional-integral (PI) control to regulate the output voltage of the PV system. Disturbances are given in the form of changes in input voltage, reference voltage, and load. Voltage deviation and recovery time to reach a steady-state condition of the output voltage after disturbances are investigated and compared to the results using a proportional-integral-differential (PID) controller. The results show that the proposed control design performs faster than the compared PID control method.

Development of single-phase single switch AC-DC Zeta converter for improved power quality

Azad Ferdous S., Sarowar Golam, Ahmed Istiak

Przegląd Elektrotechniczny

2021

R. 97, nr 7

110--115

A new topology of single–phase single switch non-isolated AC-DC Zeta converter is presented in this paper. The proposed topology in open loop operation can provide high conversion efficiency under duty cycle variation. Proposed converter with feedback controller provides high input power factor of 0.99 and reduced input THD while maintaining 900V DC output voltage. The converter exhibits stable dynamic response for sudden load change. Analysis and simulation results of the circuit are obtained using software simulation.

W artykule przedstawiono nową topologię jednofazowego, jednoprzełącznikowego nieizolowanego przekształtnika AC-DC Zeta. Proponowana topologia w pracy w otwartej pętli może zapewnić wysoką wydajność konwersji przy zmianach cyklu pracy. Proponowany przekształtnik z kontrolerem sprzężenia zwrotnego zapewnia wysoki współczynnik mocy wejściowej 0,99 i zmniejszone THD wejściowe przy zachowaniu napięcia wyjściowego 900 V DC. Przetwornik wykazuje stabilną dynamiczną odpowiedź na nagłą zmianę obciążenia.