單電阻感測電流之永磁同步馬達直接轉矩控制;Direct Torque Control for Permanent Magnet Synchronous Motor with Single Current Sensing Resistor

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Title:	單電阻感測電流之永磁同步馬達直接轉矩控制;Direct Torque Control for Permanent Magnet Synchronous Motor with Single Current Sensing Resistor
Authors:	黃子瑀;Huang, Tzu-Yu
Contributors:	電機工程學系
Keywords:	永磁同步馬達;單電流感測分流電阻;三相電流重建;空間向量脈寬調變直接轉矩控制;PMSM;single current sensing shunt resistor;Three-phase currents reconstruction;Space Vector Modulation Direct Torque Control
Date:	2023-07-20
Issue Date:	2023-10-04 16:09:22 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文在單電流感測分流電阻（Shunt resistor）安裝於直流母線（DC Bus）上的情況下，使用改進空間向量脈寬調變（Novel Space Vector Pulse Width Modulation, NSVPWM）重建三相電流，將其做為回授訊號透過空間向量脈寬調變直接轉矩控制（Space Vector Modulation Direct Torque Control, SVM-DTC）驅動永磁同步馬達。一般馬達控制以使用二個電流感測器的方法最為常見，此類方法具有成本昂貴、系統體積大以及二感測器不匹配的問題。本論文使用Shunt resistor量測通過二階逆變器（2-level inverter）的總電流並以其重建三相電流，在一次切換週期中採樣二相電流，再透過馬達三相平衡原理重建，然而傳統的空間向量脈寬調變（Space Vector Pulse Width Modulation, SVPWM）會因為零向量導致DC Bus電流為零無法提供相電流訊號，導致無法重建三相電流訊號，故本論文提出將零向量改為二互補的有效向量，消除在扇區切換邊界的電流不可觀測區域（Unobservable Area），並將三相電流訊號用於估測磁通與轉矩，應用於SVMDTC架構。本論文方法使用了改進空間向量脈寬調變，將零向量改為二互補的有效向量，在Shunt resistor增加可重建的相電流訊號，從而消除電流重建的不可觀測區域，降低馬達控制中需使用二個電流感測器的系統成本、體積以及不匹配的問題，應用於SVM-DTC的永磁同步馬達驅動。 ;This thesis uses a single current sensing shunt resistor installed on the DC bus and Novel Space Vector Pulse Width Modulation (NSVPWM) to reconstruct the three-phase currents as feedback signal. Permanent magnet synchronous motor (PMSM) is driven by Space Vector Modulation Direct Torque Control (SVM-DTC). Generally, using two current sensors is the most common method for motor control. This method has high cost, large system size and two sensor mismatching problems. In this thesis, a single current sensing shunt resistor is used to measure the total current passing through the 2-level inverter and reconstruct the three-phase currents. The condition for reconstructing the three-phase currents is to sample the two-phase current in one switching period and use the principle of motor three-phase balance to reconstruct. However, the traditional Space Vector Pulse Width Modulation (SVPWM) causes the DC bus total current to be zero due to the zero vector and the phase current signal cannot be reconstructed. Therefore, this thesis proposes to change the zero vector to two complementary effective vectors, which can effectively eliminate the current unobservable area of sector boundary. This thesis proposed novel space vector pulse width modulation, changing the zero vector to two complementary effective vectors, increasing the phase current signal that can be reconstructed from the total current, thereby eliminating the unobservable area of current reconstruction and reducing the system cost, size and mismatch issues of using two current sensors in the motor control system. Finally, it is applied to permanent magnet synchronous motor drive with SVM-DTC.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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