Abstract
An effective technique, genetic-feedforward sliding mode-fractional PI controlled buck inverter used for super-precision machining of composite materials is proposed. The obstruction using sliding mode control (SMC) is due to the strong chattering that severely limits its practical applicability. The chattering yields high voltage distortion in buck inverter output, thus degrading stability and reliability of super-precision machining of composite materials. The modification structure to fractional PI has been established through the plant extending way so that the chattering is diminished and better flexibility in adjusting system response can be provided. The feedforward compensator improves the dynamics response further. The genetic algorithm (GA) can be adopted for determining optimal fractional proportional-integral (FPI) parametric values. With this control technique, the TI microprocessor-based buck inverter is implemented, and then experiments illustrate that the presented technique produces less steady-state inaccuracy, chattering attenuation, loading interference rejection and parametric variation removal.
Highlights
Super-precision machining of composite materials needs stable and high-quality power sources [1, 2], i.e., 1. inverter wave shape with small amounts of total harmonic distortion even under rectifier loading. 2. rapid transience against step changes in load. 3. zero steadystate errors
This study develops a plant extending architecture for designing feedforward sliding mode-fractional PI (FSM-fractional proportional-integral (FPI)) controller with reduced chattering and higher flexibility
The robustness to buck inverter will be investigated via the experiments
Summary
Super-precision machining of composite materials (such as aluminum matrix composite, Cu-based composite, and magnesium matrix composite materials) needs stable and high-quality power sources [1, 2], i.e., 1. inverter wave shape with small amounts of total harmonic distortion even under rectifier loading. 2. rapid transience against step changes in load. 3. zero steadystate errors. Inverter wave shape with small amounts of total harmonic distortion even under rectifier loading. The SMC is capable of making a control system robust against internal parameter variations and external load disturbances [9, 10]. A number of SMC method developed for inverters has been done [11, 12]. The chattering may damage inverter parts and cause highly distorted wave shape even if a SMC had incorporated a feedforward path so as to improve the dynamics response [13]. This study develops a plant extending architecture for designing feedforward sliding mode-fractional PI (FSM-FPI) controller with reduced chattering and higher flexibility. In order to overcome the chattering, a fractional-order extended plant, which implies the FPI is
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