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In this paper, new model-based sensorless control methods are proposed, including estimation methods for the position and speed errors and compatible position and speed estimators. In proposed methods, the speed error is estimated as well as the position error in the conventional model-based sensorless methods. By the proposed methods, unity transfer function from actual position to estimated position...
The Zero Sequence Circulating Current (ZSCC) flows inevitably in parallel converters sharing common DC and AC sources. The currents flowing commonly in all converters increase losses and decrease the overall capacity of parallel converters. This paper proposes a simple and effective ZSCC suppression method based on the Space Vector PWM (SVPWM) method with the ZSCC controller. The zero sequence voltage...
Natural capacitor voltage balancing of six arms of a direct modulated Modular Multilevel Converter (MMC) has been observed by several articles both by experiments and simulations. However, its principles have not been revealed clearly and its dynamics have not been analyzed analytically. In this paper it's shown that a DC component and a line frequency circulating current would be induced inside the...
This paper proposes a novel control scheme for the fast current control of permanent magnet synchronous machines. The proposed method mainly works in the transient state of current control without deteriorating steady-state characteristics. The proposed method is applicable in a wide range of speed: in the speed below the base speed and in the flux weakening region. Using the proposed method, the...
The cutoff frequency of output LC filters of PWM inverters limits the control bandwidth of the converter system while it attenuates voltage ripples caused from the inverter switching. For a selected cutoff frequency of an output LC filter, infinite number of L-C combinations is possible. This paper analyses the characteristics of output LC filters for PWM inverters in the view of L-C combinations...
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