DESIGN OF PASSIVE NOISE COMPENSATION CONTROLLER COMBINED WITH EHGO OBSERVER FOR MICRO GRID INVERTER

Abstract

The inverter is an important device to connect the load to the micro power source.
However, due to the change of component values, the change of model parameters,
combined with measurement errors, external disturbances degrade the performance of the
inverter and cause instability problems. To solve this problem, a passive noise-canceling
nonlinear controller is proposed for the inverter. The proposed method of the extended high-
gain state observer can online estimate the complex influencing factors such as external
disturbances, model parameter uncertainties, so that the controller can compensate, thus
ensuring the overall stability of the inverter. The results of the paper are evaluated through
simulation on Matlab-Simulink software, showing that the controller has achieved the quality
requirements. The observer helps to reduce the number of sensors, reduce the cost and
complexity of the inverter.