A phase current reconstruction method and control system of an open-winding permanent magnet synchronous motor

Abstract

The invention discloses a phase current reconstruction method and a control system of an open-winding permanent magnet synchronous motor, belonging to the field of motors. Including: taking the drive signal of the upper switch tube of each bridge arm of the inverter II as the trigger source, collecting the bus current value at each trigger time and the total number of high levels of the drive signal of the upper switch tube of each bridge arm of the inverter II, according to the bus current value Get the three-phase current value with zero-sequence component and the total number of high levels; control the flux component, torque component and zero-sequence component of the stator current; according to the positive and negative conditions of the zero-sequence voltage required by the proportional resonance controller, control the The bridge arm drive signal of the inverter I and the bridge arm drive signal of the inverter II are phase-shifted and aligned; the blind zone phase shift is implemented according to the vector action time, and the 120° modulated SVPWM dual-inverter drive signal is output to control the motor. The invention only needs one current sensor, realizes zero-sequence current suppression and phase current reconstruction of an open-winding permanent magnet synchronous motor at the same time by shifting phases to align drive signals, and improves system stability.

Description

technical field [0001] The invention belongs to the technical field of motors, and more specifically relates to a phase current reconstruction method and a control system of an open-winding permanent magnet synchronous motor. Background technique [0002] As the world's energy shortage and environmental pollution become more and more serious, the traditional electrical industry is also developing in a green and diversified direction. The development of new energy fields has attracted more and more attention, and electric vehicles and wind power industries are among them the most talked about. [0003] The traditional star-connected winding motor system is limited by the battery capacity bottleneck or the withstand voltage level of a single switching device. At the same time, the boost module introduces energy storage inductors, voltage stabilization capacitors, etc., which increases the weight and volume of the control system. In electric vehicles or wind power systems It i...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a phase current reconstruction method and control system of an open-winding permanent magnet synchronous motor, aiming at solving the inability of the zero-sequence current suppression strategy and the phase current reconstruction strategy in the open-winding topology. compatibility issues

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