Solar PV Array Fed Self-Sensing Control of PMSM Drive With Robust Adaptive Hybrid SOGI Based Flux Observer for Water Pumping

摘要

A new robust adaptive hybrid second-order generalized integrator (SOGI) based rotor flux observer (RFO) for self-sensing control of solar photovoltaic array fed permanent magnet synchronous motor drive for water pump is developed in this article. The conventional pure integrator based RFO introduces dc offset, saturation, and harmonics, whereas a low-pass filter based produces attenuation and phase delay. To overcome these problems, a new n-layer hybrid SOGI structure (HSS) is developed and its four-layer version is used in the system. An adaptive frequency tracker is then integrated with four-layer HSS to track wide variations in system frequency due to dynamic solar irradiations, which results in an adaptive hybrid SOGI (AHS) structure. However, the AHS is sensitive to system parametric uncertainties. Thus, the sliding mode approach is used to impart the robustness. This results in new robust AHS (RAHS) structure for accurate observation of rotor flux. The improved performance of developed RAHS over its conventional counterparts is proved through Bode curves and flux loci while test results validate its performance.