Influence of Current Measurement Error to Split Capacitor Voltage in Single-Phase Half-Bridge Grid Connected Inverter
Journal
ICPE 2023-ECCE Asia - 11th International Conference on Power Electronics - ECCE Asia: Green World with Power Electronics
ISBN
9788957083505
Date Issued
2023-01-01
Author(s)
Abstract
For a single-phase half-bridge grid connected inverter with a split capacitor configuration, the adoption of the Proportional-Integral (PI) will generally suffice the need of current control action in normal inverter operation. However, the presence of measurement error in the current feedback signal can cause distortion in the grid current. Since the grid and the midpoint of split capacitors are connected through a neutral line, the unwanted dc component will flow to both capacitors and drift their voltages. This article aims to formulate mathematical equations to elucidate this phenomenon, and to recommend suitable gain ratio of the controller to maintain the safety of the inverter and to collect the voltage deviation profile before specific additional control action can be incorporated. Computer simulations under MATLAB/SIMULINK environment of 1 kVA inverter rating were performed to corroborate the theoretical analysis and the proposed method.
Subjects
Current Offset | DC-AC Inverter | Split Capacitor | Voltage Unbalance
SDGs
Type
conference paper