An Adaptive Droop DC-Bus Voltage Controller for a Grid-Connected Voltage Source Inverter With LCL Filter

作者：Eren Suzan^*; Pahlevani Majid; Bakhshai Alireza; Jain Praveen

来源：IEEE Transactions on Power Electronics, 2015, 30(2): 547-560.

DOI：10.1109/TPEL.2014.2308251

• Adaptive control
• dc/ac inverter
• droop control
• grid-connected converter
• nonlinear system
• stability
• voltage-source inverter (VSI)

This paper presents a very fast dc-bus voltage controller for a single-phase grid-connected voltage-source inverter (VSI) with an LCL output filter used in renewable energy applications. In single-phase grid-connected inverters, the design of the dc-bus voltage control scheme is very challenging due to the presence of a second harmonic ripple across the dc-bus voltage. The proposed dc-bus voltage control scheme is able to address the difficulties introduced by the second-harmonic ripple. The dc-bus voltage controller is based on an adaptive droop control technique, which is able to provide a very fast transient response for the closed-loop system and ensures the optimal operation of the VSI during steady-state conditions. Also, the simple structure of the controller makes it very practical for grid-connected VSIs used in renewable energy power conditioning systems. Theoretical analysis and experimental results demonstrate the superior performance of the proposed control approach compared to conventional dc-bus voltage control schemes.

• 出版日期2015-2