Abstract
Electric variable speed drives (VSDs) based on two VSDs connected to a multiphase machine are an attractive solution to replace high-power mechanic and hydraulic systems in many sectors of industry and transportation because they present high performance with reduced cost, volume and weight. Among the causes which affect the reliability of dual VSDs, the common-mode current flowing through the machine bearing is an important issue. This paper faces the mitigation of the common-mode current by reducing the common-mode voltage (CMV) generated by the operation of a dual VSD. The CMV reduction is carried out without introducing any extra device and/or passive filtering method. This CMV reduction is performed by applying a specific phase-displacement between the modulation strategies of each single inverter drive. The proposed technique has been evaluated in a down scaled experimental setup in order to test its effectiveness.
Highlights
The industry is moving from mechanical and hydraulic systems to the electrical drives because they present a better performance with a cost reduction [1]
The prototype consists of a dual three-phase two-level variable speed drives (VSDs) connected to a dual-phase permanent magnet synchronous machines (PMSMs) machine
Among the solutions previously provided by literature, many active canceler, passive filtering techniques and some space vector modulations (SVM)-based modulation methods have been proposed to achieve the mitigation of the common-mode voltage (CMV)
Summary
The industry is moving from mechanical and hydraulic systems to the electrical drives because they present a better performance with a cost reduction [1]. This work studies the CMV present in the dual drive application shown in Fig. 1 and develops a simple CB-PWM method to mitigate its negative effects on the system To perform this analysis, the CMV harmonic spectrum based on double Fourier description is carried out. As a consequence of this higher impedance, the ripple of the current present in the system is reduced
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