Voltage-power cooperative control method and device for flexible DC power transmission system

The invention relates to a voltage-power cooperative control method and device for a flexible direct current power transmission system, and the method comprises the steps: monitoring the direct current voltage of a multi-terminal direct current power transmission system, and when the offset of the direct current voltage exceeds an upper limit due to a fault or interference, proportionally increasing the power instruction of a receiving end converter according to the overvoltage condition of the direct current voltage, and the non-fault converter absorbs more surplus power, so that the aim of suppressing the overvoltage at the direct current side is fulfilled. According to the method, the advantages of the parallel converter of the multi-terminal direct-current power transmission system are fully utilized, and when the direct-current voltage is increased, the transmission power of the non-fault converter in the active power control mode is properly improved, so that the residual power of the direct-current sid