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This paper develops a generalized ac impedance model for synchronous generators and then a dc impedance model for generator-thyristor systems. The impedance model of a medium voltage dc (MVdc) system is built for impedance-based stability and harmonics analysis. DC current harmonics from a high-power neutral point clamped (NPC) direct torque control (DTC) motor drive is examined. It is found that...
This paper analyzes the harmonics emission, propagation, and mitigation issues in an MVDC distribution system. Specifically, the DC current harmonics from a high power NPC DTC motor drive is analyzed. It is found that DC network resonance is a major cause of DC current harmonics amplification and propagation in the MVDC system. As a result, adding a DC-side input filter inductor is proposed to attenuate...
This work studies the modeling and control of a six-phase generator and rectifier unit in MVDC systems. The design approach for the generator's automatic voltage regulator (AVR) is developed based on the generator's linearized models. The dc terminal impedance of the generator-rectifier unit is derived based on system analysis and numerical approximation. Further, the dc terminal impedance of the...
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