Control for fault-bypass of cascaded multi-level inverter

Patent metadata

Field	Value
Publication number	US-8976554-B2
Application number	US-201213621984-A
Country	US
Kind code	B2
Filing date	Sep 18, 2012
Priority date	Sep 18, 2012
Publication date	Mar 10, 2015
Grant date	Mar 10, 2015

Abstract

A cascaded multi-level inverter is controlled in fault bypass operation. Rather than relying on approximations or feedback forms, the reference voltages are generated as an analytic solution. The analytic solution and its implementation are not affected by the output frequency of the inverter and it is able to provide maximum possible balanced line-line voltage to a three-phase motor. In addition, the analytic solution provides exact limits for the allowable operation region of the motor power factor in order to prevent overvoltage conditions of the cell inverter.

First claim

I claim:

1. A system for control in fault-bypass of a cascaded multi-level inverter, the system comprising:
a first plurality of first inverter leg cells connected in series for a first phase;
a second plurality of second inverter leg cells connected in series for a second phase;
a third plurality of third inverter leg cells connected in series for a third phase; and
wherein the fault-bypass results in a difference in numbers between the first inverter leg cells in the first…

Assignees

• Siemens Corp

Inventors

• Mihalache Liviu

Classifications

• H02M7/4835 Primary

  Electricity · mapped topic

• H02M2001/0025

  Electricity · mapped topic

• H02M7/49 Primary

  Electricity · mapped topic

• H02M2007/4835

  Electricity · mapped topic

• H02M7/5395 Primary

  Electricity · mapped topic