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Front. Inform. Technol. Electron. Eng.  2018, Vol. 19 Issue (11): 1420-1431    
    
Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters
Chen-wen CHENG, Heng NIAN , Long-qi LI
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters
Chen-wen CHENG, Heng NIAN , Long-qi LI
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
 全文: PDF 
摘要： Since only one inverter voltage vector is applied during each duty cycle, traditional model predictive direct power
control (MPDPC) for grid-connected inverters (GCIs) results in serious harmonics in current and power. Moreover, a high sam-
pling frequency is needed to ensure satisfactory steady-state performance, which is contradictory to its long execution time due to
the iterative prediction calculations. To solve these problems, a novel dead-beat MPDPC strategy is proposed, using two active
inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a
constant  switching  frequency.  Thus,  smooth  steady-state  performance  of  both  current  and  power  can  be obtained.  Unlike  the
traditional three-vector based MPDPC strategy, the proposed three vectors are selected based on the power errors rather than the
sector where the grid voltage vector is located, which ensures that the duration times of the selected vectors are positive all the time.
Iterative calculations of the cost function in traditional predictive control are also removed, which makes the proposed strategy
easy to implement on digital signal processors (DSPs) for industrial applications. Results of experiments based on a 1 kW inverter
setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy.
关键词： Grid-connected ;  inverter;   ;  Model ;  predictive ;  control;  Direct ;  power ;  control;   ;  Three ;  vectors;   ;  Constant ;  switching ;  fre-
quency;  Power errors    
Abstract: Since only one inverter voltage vector is applied during each duty cycle, traditional model predictive direct power
control (MPDPC) for grid-connected inverters (GCIs) results in serious harmonics in current and power. Moreover, a high sam-
pling frequency is needed to ensure satisfactory steady-state performance, which is contradictory to its long execution time due to
the iterative prediction calculations. To solve these problems, a novel dead-beat MPDPC strategy is proposed, using two active
inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a
constant  switching  frequency.  Thus,  smooth  steady-state  performance  of  both  current  and  power  can  be obtained.  Unlike  the
traditional three-vector based MPDPC strategy, the proposed three vectors are selected based on the power errors rather than the
sector where the grid voltage vector is located, which ensures that the duration times of the selected vectors are positive all the time.
Iterative calculations of the cost function in traditional predictive control are also removed, which makes the proposed strategy
easy to implement on digital signal processors (DSPs) for industrial applications. Results of experiments based on a 1 kW inverter
setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy.
Key words: Grid-connected     inverter         Model     predictive     control    Direct     power     control         Three     vectors         Constant     switching     fre-
quency    Power errors
收稿日期: 2016-12-29 出版日期: 2019-06-13
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Chen-wen CHENG
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引用本文:

Chen-wen CHENG, Heng NIAN , Long-qi LI. Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters. Front. Inform. Technol. Electron. Eng., 2018, 19(11): 1420-1431.

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http://www.zjujournals.com/xueshu/fitee/CN/    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2018/V19/I11/1420

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