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| Direct Power Control Strategy Based on Novel Switching Table Applied in Three-Level Neutral Point Clamped Voltage Source Rectifier |
| Li Ning1, 2, Wang Yue1, Wang Zhaoan1 |
1. School of Electrical Engineering Xi’an JiaoTong University Xi’an 710049 China;
2. School of Automation and Information Engineering Xi’an University of Technology Xi’an 710048 China |
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Abstract Direct power control (DPC) strategy has the characteristics of simple algorithm and good dynamic performance in the control of three-level neutral point clamped (NPC) voltage source rectifier. This paper analyzes the basic principle of DPC strategy and deduces the relationship between system instantaneous power and parameters of AC and DC sides. Furthermore, the influence of system DC voltage utilization ratio on instantaneous power is analyzed. Then, a novel DPC strategy is proposed. The new strategy divides the system DC voltage utilization ratio into several regions, and uses different switching tables to control the instantaneous power in each region. Moreover, the novel strategy solves the DC capacitor voltage imbalance problem of three-level NPC rectifier based on the reasonable selection of switching states. Finally, this paper analyzes the reason that the system instantaneous reactive power has abnormal fluctuations in some regions of DC voltage utilization ratio, and solves it by adding transition sector and its corresponding switching table. Simulation and experimental results verify the correctness of the analysis.
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Received: 26 March 2014
Published: 28 April 2016
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2016, Vol. 31 
