This paper introduces a novel VVVF method, i.e. rotor side frequency-variable drive, which can be used to regulate the rotating velocity of high power fan and medium-voltage motor for pumpe by using a medium power low voltage IGBT inverter. In the new method, the stator winding is directly connected to 6 kV or 10 kV network and the inverter is removed from stator side to rotor side. The new method is featured by simple main circuit, reactance-less, high power factor and low harmonics, easy to start and by-pass operation.

This paper deals with the modeling of DC-DC boost chopping circuit in a huge-power chopping cascade speed regulation system while the motor power level is over 1 megawatt. The model involves the Insulated Gate Bipolar Translator(IGBT) & Free-Wheel Diode(FWD) based on a state-space averaging method. It solves the problems of thedesigning of a control system in the chopping cascade speed regulation system when the controlling motor has a huge power. The system can be remote controlled through the industrial field network, and it has a good interface of human-computer interaction.The experiments show that the dual closed-loop control system is reliable and stable, it also has the better steady-state and dynamic characteristics and higher power factor compared with traditional cascade speed regulation systems. Based on this dual closed-loop control system, several devices with remarkable energy-saving effect have been running very well in the industrial sites.

methods

A New Medium Voltage Speed-Variable Drive for Fans and Pumps—Rotor-side Variable Frequency Drive

Study on Network Remote Controlling Huge-Power Chopping Cascade Speed Regulation System Based on State-Space Averaging Model

Induction motor which has a good use in centrifugal pump and fan drive, possesses the characteristics of slip power being able to be fed back, little converter capability, stepless speed adjustment around synchronous speed, and so on. In order to realize the rotor energy flowing bidirectional and high efficiency, auxiliary windings embedded in stator of induction motor (IFIM) are used to absorb or send slip power. Upon the parameters of the ordinary induction motor of the same power level, IFIM with auxiliary windings is simulated in finite element method analysis software (ANSYS) and the transformer characteristic between the dual windings is proved. The inductances of stator windings obtained by ANSYS resolving with different angle of rotor carry out the fact that the self-inductance and the mutual-inductance is stable, which is important in parameter design.

background

Finite element method analysis of the inner fed inductor motor

The novel application of CCC technology in the slip energy recovery drive system (SERDS) is proposed for an improvement of the susceptibility of the inverter to commutation failure, reducing the reactive power consumption and a good power factor In this paper, the reason of commutation failure is analyzed, simulation model with proposed commutated capacitors between the inverter bridge and the inverter transformer in SERDS are set up and it demonstrate that the method for mitigating commutation failure is effective, simple and feasible

A New Medium Voltage Speed-Variable Drive for Fans and Pumps—Rotor-side Variable Frequency Drive

Citations

Study on Network Remote Controlling Huge-Power Chopping Cascade Speed Regulation System Based on State-Space Averaging Model

Finite element method analysis of the inner fed inductor motor

The capacitor commutated converter (CCC) as an alternative for application in slip-energy recovery drives

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