Threelevel direct torque predictive controlbased on fast virtual vector modulation
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
A novel scheme based on voltage prediction and fast virtual vector modulation algorithm for direct torque control of a permanent magnet synchronous motor fed by diode clamped multilevel inverter is proposed.The system is based on diode clamped threelevel inverter,which is widely applied to middlehigh voltage speed regulation.Combined with space vector modulation,the reference voltage vector for direct torque control is obtained by voltage predictive control algorithm,then zero vector and two adjacent virtual vectors are used to synthesize reference voltage vector based on nonorthogonal 60° coordinate.The neutral point potential is controlled by using the neutralpoint current characteristics of small vectors,the desired basic voltages and their dwelling time can be easily obtained and fast space vector modulation is achieved.Simulation results verify the feasibility of the proposed control scheme,that dv/dt of output voltage and neutralpoint potential of threelevel inverter are restrained effectively,and high dynamic and steady performances are obtained.
