Abstract
Voltage source inverters operated by predictive control methods generally lead to a variable switching frequency, because predictive control methods generate switching operation based on an optimal voltage state selected at every sampling period. Varying switching frequencies make it difficult to design output filters of voltage source inverters. This paper proposes a predictive control algorithm with a constant switching frequency for the load current control of single-phase voltage source inverters. This method selects two future optimal voltage states used in the subsequent sampling period, which are a zero-voltage state and a future optimal voltage state, based on the slope of the reference current at each sampling period. After selecting the two future voltages, the proposed method distributes them to produce a constant switching frequency and symmetric switching pattern. The performance of the proposed method is validated with both simulation and experimental results for single-phase voltage source inverters.
Highlights
With the increasing popularity of renewable energy systems, single-phase converters for grid-connected systems with distributed power generation sources, such as those for photovoltaic (PV) panels [1], electric vehicles [2], and railway systems [3], have been used more often for relatively low-power applications
The current control methods, based on proportional-integral (PI) controllers, in [4], have been generally utilized; steady-state current errors exist in the ac-side current because of exposure of the PI controller to low-frequency fundamental components
An optimal vector was selected using the model-based reference voltage in the αβ stationary coordinate frame, and the duty cycle and vector distribution were determined by the conventional space vector pulse width modulation (SVPWM)
Summary
With the increasing popularity of renewable energy systems, single-phase converters for grid-connected systems with distributed power generation sources, such as those for photovoltaic (PV) panels [1], electric vehicles [2], and railway systems [3], have been used more often for relatively low-power applications. [17] proposed the direct power control (DPC) for a three-phase voltage source converter In this method, an optimal vector was selected using the model-based reference voltage in the αβ stationary coordinate frame, and the duty cycle and vector distribution were determined by the conventional space vector pulse width modulation (SVPWM). [20] proposed the predictive current control (PCC) for the three-phase converters used in wind turbine, where optimal vectors are selected using the angles of the grid voltages and the optimal duty cycle is calculated by differentiating the cost function. This method uses SVPWM to obtain a constant switching frequency. Results for both the steady-state and dynamic responses are provided to demonstrate the effectiveness of the proposed method
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
