Model predictive decomposition control method and device for open-winding five-phase permanent magnet synchronous motor

A model predictive decomposition control method for an open-winding five-phase permanent magnet synchronous motor, comprising the following steps:

• step 1) obtaining a d-axis current and a q-axis current in fundamental space of the open-winding five-phase permanent magnet synchronous motor in a rotating coordinate system as a given value for a control system;
• step 2) constructing a virtual voltage vector table of the open-winding five-phase permanent magnet synchronous motor in a static coordinate system;
• applying a label of a virtual voltage vector in a previous control cycle, and calculating a voltage in the static coordinate system;
• and obtaining a back electromotive force of the motor according to a mathematical model of the motor;
• step 3) using the Euler forward difference prediction equation to find the q-axis current and the d-axis current in this period;
• step 4) substituting the voltage vector provided by an inverter 1 into the predictive model and a cost function in the current sampling period, finding the current of the q-axis and the d-axis of the rotating coordinate system in the next period;
• if the voltage vector provided by inverter 1 meets the requirements of a drive system, an inverter 2 is closed;
• otherwise, an inverter 1 is clamped to the maximum voltage vector, and inverter 2 provides an increment of the remaining pail;
• and
• step 5) transmitting the selected voltage vector and its corresponding duty cycle signal into the open-winding inverter.