電流源反流器供電永磁同步馬達之控制研究

Abstract

本文描述電流源反流器驅動永磁同步馬達之控制系統，電流源反流器的直流側使用降壓型直流電流控制器代替理想電流源作為輸入，電流源反流器的交流側通過並聯電容與馬達各相電感組成LC低通濾波環節，濾除開關頻率的諧波電流，且在電流源反流器某些開關狀態下為馬達提供所需的部份相電流。本文首先詳盡分析了電流源反流器使用SVPWM方式產生開關訊號的原理與方法，並通過Zero-Sequence-Injection方法，有效擴展了線性調製區範圍，提高了直流電流源的利用率，且配合我們使用的Dead-Time設置方法可將開關切換次數降到理論上最少，從而大大降低開關能耗。在控制策略方面，我們通過分析電流源反流器直流側和交流側的理論模型，初步建立起系統的控制架構，並在此基礎上通過改進，進一步實現了永磁同步馬達的 控制。此外，我們還詳細推導了反流器交流側並聯電容的設計公式，並通過模擬與實作結果驗證了系統在穩態下，和負載切換情況下的運行效果。

This dissertation studies the control system of Current-Source-Inverter-fed PMSM. The Buck DC-DC current controller is used as an ideal current source on the DC side of Current-Source-Inverter. The parallel capacitors on the AC side of Current-Source- Inverter constitute LC low pass filters with the inductive coils of PMSM, and supply phase currents for PMSM in some switching states of CSI. We use SVPWM to generate the switch signal, and the method we use to set Dead-Time can ensure minimum switching transient and reduce the switching energy consumption. Besides, the Zero-Sequence- Injection technology of SVPWM can extend the range of linear modulation, and improve the utilization of DC bus. The principle and method of SVPWM on Current-Source- Inverter is analyzed in detail. In control strategy, we build the equivalent model of the DC side and the AC side of Current-Source-Inverter separately, and improve the control method to realize the control of Current-Source-Inverter-Fed PMSM. Furthermore, we deduce the design formulas of the parallel capacitors. And the simulation and experimental results are also provided to demonstrate the validity of this system both under steady state and load switching state.