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The concept of Double-Delta Sourced Transformer (DDST) had been proposed to eliminate passive filters in large-scale power conversion systems. For the grid connection, active and reactive powers in DDST must be under control. In this paper, the power modulation method is proposed for DDST through the current regulation. And, it is also considered when one of converters is disconnected from the transformer...
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...
Trapezoidal voltages can be used to compensate for the inverter nonlinearity. Especially, the modulating shape of those voltages facilitates adaptations to varying operating conditions. In this paper, practical schemes were proposed to improve the performance of the compensation method using the trapezoidal voltages. After those schemes are detailed, their effectiveness is confirmed through experimental...
This paper proposes a novel flux-weakening control algorithm of an interior permanent magnet synchronous motor for 'quasi' six-step operation. The proposed method is composed of a feed forward and a feedback path. The feedforward path consists of 1-dimensional look-up table, and the feedback is based on the difference between the reference voltage updated by current regulator and the output voltage...
Imbalance of the neutral-point potential in three-level neutral-point-clamped converter may appear in some operating conditions. This paper analyzes the voltage distortion caused by the imbalance of the neutral point potential in a three-level neutral-point-clamped converter, and also describes the PWM method to generate the low-frequency harmonics-free output voltages even under the imbalanced condition...
This paper presents the input power factor control method of the carrier-based modulation method for the matrix converter. It is possible to synthesize the sinusoidal input currents with a desired input power factor and the desired output voltages by changing the slope of the carrier and using the offset voltages. In the proposed method, the input currents are synthesized according to the input current...
Inherent problem in three-level neutral-point-clamped voltage source inverters (NPC VSI) is the variation of the neutral point potential. This paper proposes a carrier-based PWM technique, which can balance the neutral point potential and minimize the output voltage distortion. Additionally, the modulated voltage error caused by the unbalance of the neutral point potential is analyzed and the method...
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