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Owing to their capability to reduce switching losses, discontinuous pulse-width modulations (DPWMs) have been widely discussed in the last decades. However, when using the classical DPWMs in three-level (3L) converters, neutral-point (NP) voltage balancing may not be efficiently achieved, because the reference signals are clamped and saturated at regular intervals, and consequently it is difficult...
According to the fault ride through (FRT) demand to wind generation systems of grid codes, a control scheme of grid FRT under the whole grid change was proposed for a medium-voltage three-level full power wind power converter. This method coordinately controls the generator-side converter (MSC), the grid-side converter (GSC) and the chopper to: 1) reduce the unloading burden of the chopper by limiting...
Aiming at the problems of poor dynamic control performance and difficult filter design for three-level grid-connected inverter with low switching frequency, a three-level discontinuous PWM strategy and its carrier-based implementation method are introduced. Considering the strategy's output harmonic characteristics, an LLCL filter is adopted. Then, aiming at the resonance problem of LLCL filter, two...
Linking the capacitor neutral point of LCL filter to the DC midpoint for transformerless three-level photovoltaic inverter has an advantage of leakage current reduction. But it also brings large current virtual value and low-frequency resonance of bridge-side current, which leads to the reduction of the system efficiency and stability. Aiming at these problems, the common and differential mode model...
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