<p>The construction area of the Sichuan-Tibet Railway tunnel adopts electrical equipment for green operation. Linear induction motor (LIM) is widely used in industrial production lines for conveying, positioning, and material handling. Renewable power generation technology and microgrid technology are used to power electric load in the scenario, including LIM for green tunnel construction. First, a partially information-exchanged state-of-charge (SOC) balancing strategy is proposed for the secondary control of the microgrid system, as well as a voltage compensation term or reducing voltage drops. Then to achieve safe and stable operation of LIM under complex working conditions, the normal force characteristic is introduced for control. Finally, a normal force optimization (NFO) control strategy is proposed to minimize the interference of normal force on the traction system by the genetic algorithm. Compared with traditional constant slip frequency control, this control strategy can achieve smooth control of normal force and reduce the loss of LIM. In addition, compared with traditional droop control, the proposed control strategy can verify the SOC balancing, power sharing and voltage restoration, as well as the feasibility and effectiveness of NFO strategy.</p>