Abstract
There exist several challenges in the implementation of proportional multiple quasi-resonant (PMQR) control strategies in single-phase grid-connected H6 inverters, such as high computational costs and design complexity. To overcome these challenges, this paper proposes a proportional multiple quasi-resonant (PMQR)-type repetitive control (PMQR-type RC) scheme for single-phase grid-connected H6 inverters. In the control scheme, a repetitive controller and a proportional controller run in parallel. The repetitive controller is to improve the steady-state harmonics compensation ability, while the proportional controller can enhance the transient performance of the system. Both theoretical stability analysis and detailed design steps regarding the proposed control scheme are introduced. Finally, comparison results on a typical single-phase grid-connected H6 inverter with LC filter under a variety of control methods verify the capability of suppressing harmonics and the robust performance of the proposed control strategy against grid disturbances.
Highlights
Distributed power generation systems (DPGSs) based on renewable energy sources have been increasingly implemented world-wide, such as wind and solar energy [1]
To address the issues mentioned above, this paper presents a proportional multiple quasi-resonanttype repetitive control (PMQR-type repetitive controller (RC)) scheme for single-phase grid-connected H6 inverters with the LC filter
The ability of suppressing harmonics for RC and proportional multiple quasiresonant (PMQR)-type RC was significantly reduced at the frequency, except fundamental frequency, because the repetitive control was highly dependent on frequency
Summary
Distributed power generation systems (DPGSs) based on renewable energy sources have been increasingly implemented world-wide, such as wind and solar energy [1]. Full-bridge inverters are the most commonly used, which have a nice compromise among efficiency, complexity, and cost This will generate relatively large common-mode leakage current, which increases the current harmonic content injected into grid and system loss. Various grid-tied current control techniques have been proposed to achieve the steady-state harmonics suppression. Among these control methods, the proportional-integral (PI) and proportionalrepetitive (PR) control are popular methods [11,12,13,14]. To address the issues mentioned above, this paper presents a proportional multiple quasi-resonanttype repetitive control (PMQR-type RC) scheme for single-phase grid-connected H6 inverters with the LC filter.
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