TAILIEUCHUNG - A novel concept of a single phase cascaded h bridge multilevel inverter for grid connected photovoltaic systems

This paper presents a generalized design method for controllers of a multi-loop control scheme applying for grid-connected photovoltaic systems using a single-phase cascaded H-bridge multilevel inverter. The simulation results were carried out by Matlab/Simpower Systems to validate the proposed method under different operating conditions of PV. | Journal of Science & Technology 131 (2018) 019-024 A Novel Concept of a Single-Phase Cascaded H-Bridge Multilevel Inverter for Grid-Connected Photovoltaic Systems Vu Hoang Phuong, Nguyen Khac Hieu*, Pham Viet Phuong, Tran Manh Hung Hanoi University of Science and Technology - No. 1, Dai Co Viet Str., Hai Ba Trung, Ha Noi, Viet Nam Received: April 02, 2018; Accepted: November 26, 2018 Abstract A single-phase cascaded H-bridge multilevel inverter has several DC links that allows the system to have the capability of independently voltage control to track the maximum power point in each string connected to each H-bridge. This characteristic can increase the efficiency of the PV system in case of mismatch in the strings, due to unequal solar radiation and temperature. This paper presents a generalized design method for controllers of a multi-loop control scheme applying for grid-connected photovoltaic systems using a single-phase cascaded H-bridge multilevel inverter. The simulation results were carried out by Matlab/Simpower Systems to validate the proposed method under different operating conditions of PV. Keywords: Cascaded H-bridge multilevel inverter, Grid-connected photovoltaic systems, A multi-loop control scheme 1. Introduction used at the AC side to track a current reference in order to eliminate the steady-state error. The control signals are generated to each switching device of each H-bridge by phase shifted carrier PWM method. However, the determination process to get parameters of PR current controller is very difficult in practise, especially when CHB is connected to grid through a LCL filter [7],[8]. In some studies, many trial and error procedures have been carried out to obtain a set of parameters of PR regulators [9]. Another approach to design PR controllers is based on the SISO design tool in MATLAB and system dynamic response [10], which is time-consuming and not generalized. Nowadays, grid-connected single-phase photovoltaic systems are .

• Điện - Điện tử
• Cascaded H bridge multilevel inverter
• Grid connected photovoltaic systems
• A multi loop control scheme
• Simpower systems
• Grid connected photovoltaic systems