Abstract
In recent years, More-Electric-Aircraft (MEA) becomes the state-of-the-art. One of the essential issue need to be solved is neutral-point (NP) voltage drift in three-level neutral-point-clamped (3L-NPC) power converter because of low power factor (PF) and high modulation index (MI) working condition. Meanwhile, since common-mode voltage (CMV) can damage the motor shaft, thereby degrading the efficiency and reliability of electric starter/generator (ESG) system. In this paper, a proposed modulation scheme is presented based on virtual-space vector concept to achieve both NP voltage balancing and lower CMV. Meanwhile, g-h coordinate is used to overcome excessive computational burden which is common in high-frequency power converter applications. The results of simulation investigation show the effectiveness and significant improvement of proposed modulation strategy in ESG system.
Highlights
MEA has become a cutting-edge technology over the last few decades [1]–[4]
In the configuration of electric starter/generator (ESG), permanent magnet synchronous machine (PMSM) is mechanically connected with aircraft engine shaft, and is electrically connected with 3L-NPC power converter which is the key point between mechanical and electrical part
Since 3L-NPC power converter is the interface of ESG system, its reliability and efficiency have an influence on its performance
Summary
MEA has become a cutting-edge technology over the last few decades [1]–[4]. It aims at making more use of electrical power instead of pneumatic, hydraulic and mechanical power. In the configuration of ESG, PMSM is mechanically connected with aircraft engine shaft, and is electrically connected with 3L-NPC power converter which is the key point between mechanical and electrical part. Power converter runs as an inverter which can drive PMSM to crank engine compressor. When the engine speed increases to 20krpm, the generation mode starts. In this mode, engine cranks the PMSM and make it as a generator. Since 3L-NPC power converter is the interface of ESG system, its reliability and efficiency have an influence on its performance.
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