Model Predictive Direct Power Control of Three-Phase Grid-Connected Converters With Fuzzy-Based Duty Cycle Modulation

An improved model predictive direct power control (MPDPC) for three-phase grid-connected converters is proposed. In the proposed method, two voltage vectors are applied during a control period and their duty cycles are determined by a fuzzy logic-based modulator. The inputs to the modulator are the...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2018-09, Vol.54 (5), p.4875-4885
Main Authors: Bozorgi, Amir Masoud, Gholami-Khesht, Hosein, Farasat, Mehdi, Mehraeen, Shahab, Monfared, Mohammad
Format: Article
Language:English
Subjects:
Computer simulation
Control Lyapunov function (CLF)
Control stability
Converters
Electric potential
Fuzzy logic
fuzzy logic modulator
Hardware-in-the-loop simulation
Liapunov functions
Mathematical model
Mathematical models
model predictive direct power control (MPDPC)
Power control
Predictive control
Predictive models
Reactive power
Stability criteria
Switches
Switching
Switching frequency
switching pattern
Voltage control
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Summary:An improved model predictive direct power control (MPDPC) for three-phase grid-connected converters is proposed. In the proposed method, two voltage vectors are applied during a control period and their duty cycles are determined by a fuzzy logic-based modulator. The inputs to the modulator are the active and reactive power errors and the output is the duty cycle of the first (main) voltage vector. The fuzzy rules are developed based on expert knowledge and the fact that small/large power errors can be compensated by applying the main voltage vector for a small/large portion of the switching period. The candidate voltage vector pairs are examined on a control Lyapunov function and the pair that satisfy the closed-loop stability criteria are selected. The voltage vector pairs are then applied following a proposed switching pattern through which reduced average switching frequency is achieved. Comparative simulation and hardware-in-the-loop studies between the proposed method and a most recently introduced duty cycle-based MPDPC confirm that in addition to lower average switching frequency, better quality currents and active and reactive powers can be achieved under the proposed MPDPC.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2018.2839660