Self-adaptive adjusting voltage-sharing resistor, control strategy and frequency converter

The invention discloses a self-adaptive adjusting voltage-sharing resistor, a control strategy and a frequency converter. The self-adaptive adjusting voltage-sharing resistor comprises a controllable resistor module and a control center, the plurality of controllable resistor modules are arranged in parallel between the positive pole DC + of the direct-current power supply and the neutral point N, and are arranged in parallel between the negative pole DC-of the direct-current power supply and the neutral point N; a relay and a voltage-sharing resistor are arranged in each controllable resistor module; the control center is connected with the relay and used for controlling opening and closing of the relay to adaptively adjust the resistance value of the controllable resistor module. The total resistance value of the voltage-sharing resistor is adjusted by controlling opening and closing of the relays in the controllable resistor modules, and when the voltage-sharing resistor operates normally, the total resist