ripple control
3.Aiming at permanent brushless DC motor in mini-BEV (battery electric vehicle) with torque ripple and violent noise during low speed running, the fuzzy control method is combined with slide mode control method to suppress the influence due to un-modeling parameters, and to ensure the robustness in the process of reaching slide mode plane.
5.The field operation of system indicates that the strategy based on fuzzy boundary criterion is able to reduce the time of tap-cha nge control and voltage ripple. Comparing with the result of general nine-subdiv ision control,the strategy based on fuzzy boundary criterion of reactive power can increase the service life of tap changer while does not reduce the effect of voltage and reactive power control.
9.Compared with traditional control scheme for BLDC motor,through adopting the phase voltage as control objectives and making the phase current similar to sinusoidal waveform,torque ripple of BLDC motor has been reduced from 14% to 3.4% and torque increased by 3.5%. Furthermore,detecting the Zero-crossing point of Back Electro Motive Force (BEMF) by means of non-conducting phases,sensorless control can be realized.
10.For APFC with the determinations of the structure, power stage circuit, current modes, control methods and control IC, it can be shown that this traditional APFC has the following disadvantages, i.e. the greater ripple of output voltage, the longer response time of voltage loop and a great deal of switch ripple lying on the input current.
