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| Comparative Study for Direct Power Control and Direct Power Predictive Control in Three-Phase Grid-Connected Inverters |
| Zhao Fangping1, Yang Yong2, Ruan Yi1, Zhao Chunjiang3 |
| 1. Shanghai University Shanghai 200072 China 2. Soochow University Suzhou 215021 China 3. Shanghai University of Electric Power Shanghai 200090 China |
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Abstract According to the dynamic mathematical model of three-phase grid-connected inverters, the influence on the active power change and the reactive power change is derived and analyzed in detail for grid-connected inverters when the voltage vectors are impressed. The best voltage vector is selected according to the signs of the active power change and the reactive power change, which can make the ripple of the active power and the reactive power small. On this basis, a direct power control (DPC)based on a new switching table is proposed. A novel direct power predictive control is adopted at same time, which is combined with space vector pulse modulation (SVPWM). This control strategy achieves the decoupling control for the active power and reactive power and an adjustable power factor. At last, comparative experiments are tested for direct power control and direct power predictive control (DPPC). The feasibility and correctness of the control strategy are verified by experimental results.
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Received: 01 April 2010
Published: 20 March 2014
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2012, Vol. 27 
