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Multilevel topology and selective harmonic compensation (SHC) can control active power, reactive power, and to provide ancillary functions to support the grid. However, researchers find that with conventional L or LCL filter, multilevel SHC would act as noise source and inject harmonics to the grid by itself. Moreover, the output current of the multilevel converter is sensitive to the error of the...
One critical drawback of staircase multilevel selective harmonic elimination and compensation is that the modulation index range is very narrow. As a result, its application is limited. This paper presents a technique to transform the transcendental equations to geometry-based voltage phasor diagrams to explore the reason for the limited solution range and proposes a four-quadrant modulation technique...
Recently, transformerless photovoltaic (PV) systems become popular in industrial applications due to the demands of high efficiency and low cost inverters. However, the leakage ground current and common mode (CM) electromagnetic interference (EMI) noise becomes significant so they need to be addressed. In solving the problems, a simple CM noise model is widely used. However, the model does not include...
One critical drawback of Selective Harmonic Elimination (SHE) and Compensation (SHC) in Cascaded Multilevel Inverter (CMI) topology is that the solution range is very limited and in an irregular shape. As a result, the compensation capacity and system parameters are hard to determine. This paper proposed a voltage phasor diagram to explain the reason of the limited solution range, proposed a four-quadrant...
In this paper, the relations among the active power distribution, modulation wave and unbalanced loads range are analyzed. A maximum unbalanced loads range is proposed by modifying modulation waveforms under the unity power factor. And a modified staircase modulation, which is easy to realize, is proposed for a single-phase cascaded H-bridge multilevel rectifier to extend the range of unbalanced loads...
This paper presents a new design for an ultra-fast, public electric vehicle (EV) charging station. Because of the multi-megawatt nature of such a station, the design is aimed at being appropriate for a medium voltage (MV) connection. Through the proper choice of a multi-level topology and staircase modulation, it is able to operate efficiently and provide galvanic isolation without the use of a large...
Common mode (CM) choke saturation is a practical problem in common-mode filter applications. It's generally believed that the leakage inductance of common-mode chokes makes the core saturated. This paper analyzes two new mechanisms for common-mode choke saturation due to common-mode voltage, and these mechanisms are verified in experiment. Common-mode choke saturation is particularly important for...
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