Control of Three-Phase Voltage Source Converters with the Derivative-Free Nonlinear Kalman Filter

Abstract

The paper is concerned with proving differential flatness of the three-phase voltage source converter (VSC) model and its resulting description in the Brunovsky (canonical) form. For the linearized canonical model of the converter a feedback controller is designed. At a second stage, a novel Kalman Filtering method (Derivative-free nonlinear Kalman Filtering) is introduced. The proposed Kalman Filter is redesigned as disturbance observer for estimating additive input disturbances to the VSC model. These estimated disturbance terms are finally used by a feedback controller that enables the DC output voltage track desirable setpoints. The efficiency of the proposed state estimation-based control scheme is tested through simulation experiments.

Adaptive Control Schemes for Three-Phase Grid-Connected Inverters in Photovoltaic Power Generation Systems

“…In [19], a nonlinear control for the three-phase inverter using the derivative-free nonlinear Kalman filter is introduced, this paper develops a nonlinear approach to the three-phase inverter system with a Kalman filter. To make the control problem simpler, in this research they directly control the power to track the desired reference value which is obtained from the maximum power point tracking (MPPT) module.…”