Abstract
AbstractIn this study, the interleaved buck converter‐based photovoltaic (PV) emulator current control is presented. A proportional‐resonant‐proportional (PR‐P) controller is designed to resolve the drawbacks of conventional PI controllers in terms of phase management, which means balancing currents evenly between active phases to avoid thermally stressing and provide optimal ripple cancelation in the presence of parameter uncertainties. The resonant path of the controller (PR) with a constant proportional unity gain is designed considering the changing dynamics of a notch filter by pole placement method (adding mutually complementary poles to the notch transfer function) at PWM switching frequency. The proportional gain path (P) of the controller is used to determine the compatibility of the controller with parameter uncertainty of the phases and designed by utilizing loop‐shaping method. The proposed controller shows superior performance in terms of 10 times faster‐converging transient response, zero steady‐state error with significant reduction in current ripple. Equal load sharing that constitutes the primary concern in multiphase converters is achieved with the proposed controller. Implementing of robust control theory involving comprehensive time and frequency domain analysis reveals 13% improvement in the robust stability margin and 12‐degree bigger phase toleration with the PR‐P controller. In addition to these, the proposed unconventional design process of the controller reduces the computational complexity and provides cost‐effectiveness and simple implementation. Moreover, implementing of auxiliary resistor‐capacitor (RC) circuits parallel with the inductors to sense the current in each phase removes the need for current measurement sensors that contribute to overall cost of the system.
Highlights
Depletion of fossil fuels and consequential environmental losses of anthropogenic disturbances prognosticate that power generation from renewable energy sources will become more of an issue in future.1-4Many research studies conducted on sustainable energy have shown that solar power with its almost zero detrimental effect on the environment uncontrovertibly is one of the prominent renewable energy sources.5–8 In addition to its slightest impact on the environment, solar power is the most abundant and inexhaustible source of energy.[9,10] Photovoltaic (PV) panels for solar energy generation have wide range of applications from residential districts to large-scale solar power plants.[11]
This paper has presented interleaved buck converter- based photovoltaic emulator current control with proportional-resonant-proportional (PR-P) controller
By considering the most commonly used controller mappings for switch mode power supplies (SMPS) with their features, advantages, and limitations, verification and validation of the designed path of the controller (PR)-P controller compared with the PI controller have been presented to illustrate the proposed controller scheme efficiency by using robust control theory
Summary
Depletion of fossil fuels and consequential environmental losses of anthropogenic disturbances prognosticate that power generation from renewable energy sources will become more of an issue in future.1-4. Duty ratio to the inductor current transfer function is obtained from Equation (43) by substitution of the calculated components values for one phase of the intended buck converter as: addition to these objectives, maintaining load sharing in balance, increase the robustness of the system despite parameter uncertainties, reduction in current and voltage ripples are aimed in this paper. Open-l oop 2.7203e-0 4 4.1803e-0 4 10.9681 12.2004 0.31 0 12.2004 6.5048e-0 4
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