A zero vector starting SVPWM neutral point potential balance control method

A zero vector starting SVPWM neutral point potential balance control method is provided. When the midpoint potential oscillation exceeds a limited value, the control method firstly compares the actiontimes of two small vectors in the current sampling period of the zero vector start SVPWM, defines a small vector with a longer action time as a long small vector, and defines a small vector with a shorter action time as a short small vector; A time allocation factor ptime is obtained by detecting the neutral point current direction and the neutral point potential oscillation value corresponding to the long small vector and sending the oscillation value to the PI controller. The neutral point potential balance of zero vector initiation SVPWM method is dynamically adjusted by using the time allocation factor ptime to control the action time of long and small vectors. The control method of the invention can control the neutral point potential deviation under the action of the zero vector start SVPWM method in a rela