Abstract
This paper performs parameter optimization of proportional-integral (PI) and repetitive controller (RC) with a new objective function by adding two degrees of freedom for a three-phase boost power factor correction (PFC) rectifier. The main objectives are to optimize the multiple control loop parameters for total harmonics distortion (THD) reduction and dynamic performance indices improvement, including overshoot, rise time, and zero steady-state error. The control parameters of the three-phase boost PFC rectifier are optimized through a standard genetic algorithm. After obtaining the optimal PI and RC parameters values, fast Fourier transform and dynamic response analysis were performed using MATLAB. Moreover, separate evaluation functions are used to validate the optimal results in terms of THD reduction and dynamic performance indices improvement. Furthermore, the results are compared with the existing objective functions to show the proposed objective function superiority. Simulation results demonstrated that our proposed objective function outperforms existing objective functions to achieve optimal PI and RC parameters value. Finally, simulation results are validated through experimental results. The experimental setup includes a 5kW three-phase PFC rectifier with DSP TMS320F28335 prototype hardware to verify controller parameter performance.
Highlights
The widespread use of the active AC-DC rectifier leads to the rise in non-linearity of electronic equipment resulting in grid current degradation
From (25), it is observed that Zwe-Lee Gaing (ZLG) objective function is primarily based on the dynamic performance indices (Mp, tr, ts and Ess), which can mainly adequate for the parameter optimization of a single voltage loop PI controller
The PI and repetitive controller (RC) parameters optimized values for the three-phase boost power factor correction (PFC) rectifier are summarized in Table 4, including comparative simulation results with existing objective functions, namely integrated squared error (ISE), integrated absolute error (IAE), integrated time multiplied squared error (ITSE) and ZLG
Summary
The widespread use of the active AC-DC rectifier leads to the rise in non-linearity of electronic equipment resulting in grid current degradation. In this study, PI and repetitive control parameters of a three-phase boost PFC rectifier is optimized using a standard genetic algorithm (SGA). Since the objective function is based on the combination of dynamic performance indices Mp, tr , ts, and Ess, it is effective for single control loop PI parameters optimization, primarily for the outer voltage loop. As the three-phase boost PFC rectifier contains multiple control loops, after adopting the PI-repetitive controller for the inner current loop, the design parameters need to be further optimized. PI-repetitive control structure is adopted, the necessary and sufficient condition for the stability of the system constitutes that the poles of the closed-loop transfer function, i.e., roots of both terms 1 and 2must be located inside the unit circle, defined using [19].
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