31 results about "Two-phase electric power" patented technology

The invention discloses a twelve-phase motor based fault tolerance operation control method and device of a flywheel energy storage system. The method comprises when a fault occurs in one phase of thetwelve-phase permanent magnet synchronous motor (PMSM), the fault phase is cut off, a residual winding in a three-phase winding corresponding to the fault phase is equivalent to a single-phase PMSM,and the three-phase winding of the phase without fault is equivalent to three three-phase PMSMs; a mathematic model of the one equivalent single-phase PMSM in a rest frame is established, and operation of the equivalent single-phase PMSM is controlled in an adaptive quasi-PR control method; and the weak magnetic current of the three three-phase PMSMs is controlled to generate a magnetic resistancetorque, the magnetic resistance torque compensates the power fluctuation and amplitude loss generated by operation of the equivalent single-phase PMSM, so that fault tolerance operation control is carried out on the flywheel energy storage system. The method can be used to ensure smooth switching from normal operation to fault tolerance operation, power is kept unchanged before and after switching, and the method is easy to realize.

An electric machine control system adapted to a motor includes a voltage detector, a power module, a current detector and a controller. The voltage detector detects a bus voltage to generate a voltage detection signal. The power module generates a first phase current, a second phase current and a third phase current to drive the motor according to the bus voltage and a PWM signal. To generate the current detection signal, the current detector detects at least two of the following: the first phase current, the second phase current and the third phase current. When the motor is operating in a steady state and blocked, the controller calculates the DC offset error of the motor according to the voltage detection signal and the current detection signal.

The invention discloses a model prediction control method and device for a twelve-phase driving system. The method comprises the following steps: all possible switch state information of the twelve-phase driving system is simplified to obtain final switch state information; a converter output current value, a DC voltage value, a rotation speed and a rotor position at a k moment are acquired respectively; a prediction model at the k moment is constructed based on a space vector decoupling model of a twelve-phase motor, and through the prediction model, a predicted current value at a (k+2) moment is predicted; and an objective function is constructed, the current values and the predicted current values of four sub-planes are substituted into the objective function, the switch state corresponding to the minimum objective function in the final switch state information is selected to obtain driving signals of each bridge arm at a (k+1) moment. The method reduces selection of two weight coefficients, the model prediction control algorithm in the twelve-phase motor driving system is simplified while independent control on harmonic current is realized, and the computational complexity is reduced.