Hybrid pseudo-bipolar direct-current transmission method for supplying power to passive network and weak alternating-current network

The invention discloses a hybrid pseudo-bipolar direct-current transmission method for supplying power to a passive network and a weak alternating-current network. The method is characterized in that two six-pulse current source converters are adopted in the rectification side, a six-pulse voltage source converter is adopted in the inversion side, and then a pseudo-bipolar direct-current transmission system is established. A constant-current control mode is adopted in the rectification side, a constant-alternating-current voltage-direct-current voltage control mode is adopted in the inversion side, stable power transmission is achieved, the voltage stability of a receiving system is guaranteed as well, and therefore it is made possible that the power is supplied to the passive network and the weak alternating-current network through the novel direct-current transmission system. Compared with a flexible direct-current transmission method, power transmission cost is reduced; compared with a traditional direct-current transmission method, the power can be supplied to the passive network; the novel direct current-transmission system has high transient stability.