| Title |
2nd Order Deadbeat Controller Considering Calculation Time Delay and Sensitivity for UPS Inverter |
| Authors |
김병진(Kim, Byoung-Jin) ; 최재호(Choi, Jae-Ho) ; Jain , Amit(Jain , Amit) |
| Keywords |
UPS ; Inverter ; Deadbeat ; Controller ; Repetitive Predictor |
| Abstract |
Deadbeat technique has been proposed as a digital controller for an UPS inverter to achieve the fast, response to a load variation and to conserve a very low THD under a nonlinear load condition. This scheme contains a fatal drawback, sensitivity against parameter variation and calculation time delay. This paper proposes a second order deadbeat controller, which fundamentally solves the calculation time delay problem and certainly guarantees the robustness of the parameter's variation. RLP(Repetitive Load Predictor) which predicts the load current ahead of two sampling time and FVR(Fundamental Voltage Regulator) which eliminates the fundamental errors of the output voltage are also proposed for the second order deadbeat controller to apply to UPS inverter systems. These are shown theoretically and practically through simulation and experiment. |