Three-vector model predictive control method for open-winding permanent magnet synchronous motor with hybrid power supply

Abstract

The invention discloses a fast three-vector model predictive control method based on a hybrid power supply type open-winding permanent magnet synchronous motor. According to the method, three different control constraints of capacitor voltage balance, stator flux linkage amplitude and electromagnetic torque are unified, a next beat system voltage reference value is predicted according to the collected three-phase current and DC capacitor voltage, two inverters are allocated, then a voltage vector combination with a smallest error of the voltage reference value and a duty ratio are obtained byusing a fast three-vector method, a corresponding switching signal is used as a driving signal of the double inverters, and therefore, the control of the hybrid power supply type open-winding permanent magnet synchronous motor is achieved. According to the method, by unifying the three different control constraints into a single voltage control constraint, two weighting factors are eliminated, thedifficulty of implementing the model predictive control is effectively reduced, an optimal voltage vector combination and duty ratio are selected by a quick three-vector method, the complexity of analgorithm is effectively reduced, and the steady state control performance of a system is improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a fast three-vector model predictive control method based on a hybrid power supply type open-winding permanent magnet synchronous motor. Background technique [0002] In recent years, due to the advantages of high power factor, simple structure, flexible control and reliable operation, permanent magnet synchronous motors have been widely used in military industry, aerospace, electric vehicles, national economy, industrial and agricultural production and other fields. However, as the power level of the above-mentioned applications continues to increase, a single power electronic converter drive system can no longer meet the performance requirements. For this reason, the open-winding permanent magnet synchronous motor system powered by a new type of double-inverter with double-terminal power supply has attracted extensive attention from scholars and industries at ...

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Problems solved by technology

However, the evaluation function in the control method provided by this document contains three constraint quantities: torque, flux linkage amplitude and capacitor voltage balance, resulting in the need for complex tuning of the two weighting factors during control; secondly, due to the dual The number of voltage vectors in the inverter system is large, and the traversal method for optimization greatly increases the complexity of the algorithm; in addition, using a single voltage vector to act on each control cycle, the torque ripple generated by the motor is also large

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