本論文重點是以電壓空間向量調變法來改良直接轉矩控制架構,使用Verilog硬體描述語言來撰寫硬體架構,最後以可規劃邏輯陣列(FPGA)實現與驗證。 本論文控制系統的基本原理為經由偵測馬達三相電壓、電流與轉子轉速來計算出馬達的磁通量與轉矩量,經過轉矩PI控制器、磁通PI控制器與座標轉換電路來得到適當的電壓空間向量來切換變頻器功率電晶體,以獲得穩定的馬達速度響應;而使用電壓空間向量調變法,則是為了避免因為磁滯控制器造成切換週期頻率不固定,導致轉矩、磁通響應漣波過大的缺點;另一方面,以公式直接計算出參考電壓,取代電壓向量切換表,改善傳統直接轉矩控制,充分發揮數位晶片計算速度快速的優點。 我們運用硬體描述語言撰寫出系統的運作模式,確認語法與功能正確無誤後,並經由QuartusII及ModelSim軟體模擬驗證,再以Altera的EP2C70F896C6 FPGA晶片驗證,最後接上實際硬體電路完成整個三相感應馬達控制的設計與實作。
The thesis is to design a direct torque control (DTC) system using vlotage space vector modulation (VSVM) method to decrease the ripple of torque and flux. Verilog hareware description language (HDL) is used to completed the hardware architecture. Finally, this system is implemented and verified on FPGA. The basic principle of this control system is to calculate the stator’s magnetism flux and torque by detecting the three-phase current, three-phase voltage and the rotor speed. By using the torque PI controller, magnetism flux PI controller, and coordinate transform circuit, we can have a suitable voltage space vector to switch power MOSFET of inverter, and have a stable response in motor speed. Notify that the formula calculation is used to decide the reference voltage instead of voltage vector switch table. It fully takes the advantage of digital IC which has fast operation speed. After confirming the syntax and function of source code, the control system need to be verified with QuartusII and ModelSim. Finally, we verify the function of this control system by Alteta’s EP2C70F896C6 FPGA IC and complete this three-phase induction motor control system design.
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