多電平變頻器無速度傳感器直接轉矩控制的研究

摘要：在級聯多電平直接轉矩控制中，通過引入錯時采樣空間矢量調制法，采用PI調節與錯時采樣空間矢量調制，摒棄開關向量表與滯環比較器，可以克服傳統直接轉矩控制開關向量表復雜、波形質量差、轉矩脈動大、開關頻率不定等缺點。無速度傳感器技術的使用可提高可靠性與降低成本。與其他多電平空間矢量算法相比，其功率單元使用均衡，執行效率高，易于實現，可保證無速度傳感器直接轉矩控制的實時性。通過仿真對這一方法進行了證明。 敘詞：錯時采樣空間矢量調制 直接轉矩控制 無速度傳感器 級聯多電平逆變器 Abstract：In the area of direct torque control (DTC) for cascade multilevel inverter, by introducing the sample-time-staggered space vector modulation (STS-SVM), adopting PI regulation and STS-SVM strategy, getting rid of the switching vector tables and hysteresis comparators, the disadvantages such as complex switching vector tables, low quality output waves, large torque ripple, and unfixed switching frequency are overcomed. The adopting of speed sensorless technology can increase the reliability and decrease the cost. Compared with other multilevel SVM algorithms, STS-SVM can use the power cells in equilibrium, be implemented easily and be performed efficiently. It can satisfy the real-time require of speed sensorless direct torque control. This method is proved by simulation. Keyword：Sampe-time-staggered space vector modulation, Direct torque control, Speed sensorless, Cascade multilevel inverter