The interaction between governor power control and converter speed control in distributed full-power variable-speed pumped storage units (Full-power VSPS) may induce power oscillations or even lead to system instability. Based on the small-signal model of distributed full-power VSPS under electromechanical transient conditions

this paper adopts the complex torque coefficient method to quantitatively analyze the control interaction between the governor and the converter

along with its impact on the unit's total damping coefficient. The sensitivity of the total damping coefficient to the turbine transfer coefficient and operating water head is investigated

and coordination principles for the governor and converter control parameters are established. In response to the widely observed issue of insufficient total damping coefficient of the unit

a stability enhancement method is proposed by integrating a compensation link into the governor control loop to increase the total damping. The proposed control strategy demonstrates robust stability improvement across a wide range of operating heads. Finally

simulation and experimental results validate the accuracy of the analytical conclusions and the effectiveness of the proposed strategy.