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LQR and H-infinity Control of Voltage Source Inverters for AC Microgrids
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| Author(s) |
JORGE TENORIO |
| Abstract |
This paper presents a voltage controller design of three-phase voltage source inverters using $LQR$-based active damping and H$\infty$ control strategy. Active damping consists of an $LQR$ voltage and current feedback of $LC$ filter in the $\alpha\beta$ frame. In addition to the damping obtained in the $LC$ filter, the proposed $LQR$ strategy allows increasing the bandwidth of the system to reject high frequency disturbances. Three-phase voltage regulation is achieved in the $\alpha\beta$ frame using the H$\infty$ control strategy. In this strategy is used a new four order sensitivity functions to obtain very low tracking error and rejection of harmonic disturbances generated by nonlinear loads. The controller has been validated in laboratory tests using 2kW-220V three-phase inverters and non-linear loads. This controller has been compared to resonant proportional control and better performance has been verified. A $THD\_v$ = $1.3\\%$ has been experimentally obtained when a nonlinear load is connected. |
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| Filename: | 0258-epe2020-full-05265270.pdf |
| Filesize: | 3.549 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-01-18 by System |
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