Abstract
In this paper, a two-degrees-of-freedom control structure is proposed to minimize both total harmonic distortion and tracking error of inverter output voltage, adopting a resonant tracking controller and a modified uncertainty and disturbance estimator (UDE). Owing to the two-degrees-of-freedom feature of the proposed control strategy, tracking and disturbance rejection tasks are decoupled and treated almost independently. A time-delay action is introduced into a commonly adopted low-pass UDE filter to minimize the output impedance magnitude around the odd harmonics, which is typical to nonlinear loads. Once the disturbance is properly rejected, a tracking resonant controller is designed to force the output of the nominal system to follow a sinusoidal reference with near-zero amplitude and phase error. The performance of the proposed control structure is fully verified by the experimental results.
Original language | English |
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Article number | 8351975 |
Pages (from-to) | 459-469 |
Number of pages | 11 |
Journal | IEEE Transactions on Industrial Electronics |
Volume | 66 |
Issue number | 1 |
DOIs | |
State | Published - 1 Jan 2019 |
Keywords
- Inverter
- resonant control
- total harmonic distortion (THD)
- two-degrees-of-freedom control
- uncertainty and disturbance estimator (UDE)
- voltage quality
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering