Method and system for calculating regulator parameters of PMSM (permanent magnet synchronous motor) control system without electrolytic capacitor

The invention discloses a method and a system for calculating regulator parameters of a PMSM (permanent magnet synchronous motor) control system without an electrolytic capacitor, and belongs to the field of motor variable frequency driving. The method comprises the following steps: enabling a q-axis current loop to be equivalent to a first-order inertial link; setting the resonance bandwidth and the resonance frequency of a PIR regulator; establishing torque ring performance index constraint conditions; selecting a torque loop phase angle margin and an open-loop cut-off frequency under the condition that the torque loop performance constraint condition is met at the same time; and calculating parameters of a torque ring PIR regulator under the torque ring phase angle margin and an open-loop cut-off frequency. The PI regulator is adopted for the direct current component of the equivalent torque of the output power of a following inverter, the static error following condition caused by only using a P regulator