High-Performance Predictive Control of Quasi-Impedance Source Inverter

The quasi-Z-source inverter (qZSI) has attracted much attention for motor drives and renewable energy applications due to its capability to boost or buck in a single converter stage. However, this capability is associated with different challenges related to the closed-loop control of currents, cont...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-04, Vol.32 (4), p.3251-3262
Main Authors: Mosa, Mostafa, Balog, Robert S., Abu-Rub, Haitham
Format: Article
Language:English
Subjects:
Alternating current
Capacitors
Computer simulation
Control stability
Control systems design
Converters
DC–AC power conversion
Impedance
Inductors
Inverters
model predictive control (MPC)
Performance prediction
Predictive control
Proportional integral
quasi-Z-source inverter (qZSI)
Switches
Voltage control
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Summary:The quasi-Z-source inverter (qZSI) has attracted much attention for motor drives and renewable energy applications due to its capability to boost or buck in a single converter stage. However, this capability is associated with different challenges related to the closed-loop control of currents, control the dc capacitor voltage, produce three-phase ac output current with high dynamic performance, and obtain continuous and low ripple input current. This paper presents a predictive control strategy for a three-phase qZSI that fulfills these requirements without adding any additional layers of control loops. The proposed controller implements a discrete-time model of the qZSI to predict the future behavior of the circuit variables for each switching state, along with a set of multiobjective control variables all in one cost function. The quasi-impedance network and the ac load are considered together when designing the controller in order to obtain stability of the impedance network with a step change in the output reference. A detailed comparative investigation between the proposed controller and the conventional proportional-integral (PI) controller is presented to prove the superiority of the proposed method over the conventional control method. Simulation and experimental results are presented.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2531989