• Problem: Starting and operating induction machines with load commutated inverters (LCIs) in medium voltage applications pose challenges due to the requirement of a leading power factor. While a dual-stator induction machine with one winding rated for medium voltage (MV) and the other for low voltage (LV) addresses this, inadequate commutating voltage at low speeds limits torque capability.
• Proposed Solution: The disclosed method and system involve integrating a voltage source inverter (VSI) with the LCI-fed induction machine, utilizing the VSI for providing reactive power to induce a leading power factor at the LCI terminals. Additionally, commutation voltage determination and application of suitable voltage vectors at the LV winding ensure smooth operation and torque control, addressing the starting and low-speed limitations.
• Objective: The objective is to enable full-torque starting and low-speed operation of LCI-fed induction machines by effectively managing power factor induction and commutation voltage control, thereby enhancing the performance and applicability of such drives in medium voltage applications.

Advantages:

• Efficiency and Power Factor Enhancement.
• Torque Control and Starting Performance Improvement.
• Integration and Compatibility