Youtility, Inc.

Det International Holding Limited

Richard Griessel

Richard Shaun Welches

Daniel P Hohm

Karsten Fink

Kevin E LeRow

Jian Wen

Peter Beckedahl

Michael Bragard

Thomas O'Reilly

Ralf Wegener

Karl Bond

Kilian Noetzold

In a converter for converting energy from a generator to a power network, wherein the converter comprises multiple power modules, wherein each power module includes at least two power cells and a transformer for connecting the power cells to the power network, wherein each power cell includes a phase input, a phase output, a transformer output connected to the transformer, a rectifier circuit and an inverter, the transformer (T) of a power module () includes one generator-side winding () for each of the power cells () and exactly one common grid-side winding for balancing an energy flow through the power cells () of a power module ().

Bypassed cascaded cell converter

The invention in the simplest form is an improved variable speed engine/generator set with an integrated power conditioning system and control method, used to generate high quality AC power with optimum fuel efficiency and reduced emissions. The variable speed generator control scheme allows for load adaptive speed control of engine and generator field. The transformerless power inverter topology and control method provides the necessary output frequency, voltage and/or current waveform regulation, harmonic distortion rejection, and provides for single phase, or unbalanced loading.

Transformerless, load adaptive speed controller

The invention in the simplest form is a power conditioning and inverting system for improved and efficient power generation. In particular, the present invention is a modulated dc link scheme that dramatically reduces the switching frequency ripple across the PWM output filter inductor and provides cost, size, and weight reductions, as well as efficiency enhancements. In a preferred embodiment of the present invention, the DC-DC converter control takes a feedback signal proportional to the inverter output voltage. This feedback is &ldquo;summed&rdquo; into the primary DC-DC volts command thereby causing the dc bus/link voltage to vary at a multiple of the output fundamental frequency causing the DC link to become a signal at a fundamental frequency voltage with a dc offset. The tooth modulator DC supply tracks the AC output voltage, reducing the difference between the applied DC volts and the AC output volts, thereby reducing inductor core losses.

Inverter DC link volts &ldquo;tooth&rdquo; modulation scheme

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Derry, NH, United States of America

Richard Griessel