Abstract
Abstract:
The cascaded NPC/H- bridge inverter is first
analyzed by establishing a new switching model based on a
derived control law, then using the model a general model using
state space technique is obtained. A new and accurate average
model is developed using abc to dqo transformation technique. A
small signal model is developed by linearizing all the state
variables around their quiescent operating points. The small
signal model is used to study the effects of various control
feedback variables on the dynamic performance of the PV- Grid
system. Based on the transfer function developed feedback
control loop is developed to improve the dynamic response of the
system as well as voltage balancing of the DC link. Simulation
results are provided to validate the analytical models.