Power converting apparatus
AssigneeMitsubishi Electric Corporation
InventorsTakashi Kuitani, Mutsumi Ishii, Morishige Akagi
Life of this patent
Estimating the term…
Abstract
A power converting apparatus used as an uninterruptible power supply connected between an AC power supply and a load includes first and second power converters, a power supply voltage sensor, an output voltage sensor and a controller. The controller calculates rms voltage values of positive and negative half-cycles of an AC output voltage detected by the output voltage sensor, generates a target voltage command based on calculation results and a given reference voltage command, and controls the first power converter based on an output voltage command which is equivalent to a voltage difference between the AC power supply voltage detected by the power supply voltage sensor and the target voltage command.
Claims11
A power converting apparatus comprising:
- a first power converter including at least one single-phase inverter for converting DC power fed from a first DC power supply into AC power, an AC output side of the single-phase inverter being series-connected to an AC power supply and a load therebetween;
- a power supply voltage sensor for detecting a voltage fed from the AC power supply;
- an output voltage sensor for detecting an AC output voltage supplied to the load;
- and
- a controller including a positive-side rms voltage value calculator and a negative-side rms voltage value calculator for calculating rms voltage values of positive and negative half-cycles of the AC output voltage detected by said output voltage sensor, respectively, and a target voltage generator for generating a target voltage command based on results of calculations by said positive- and negative-side rms voltage value calculators and a given reference voltage command;
- wherein said controller controls said first power converter based on an output voltage command which is equivalent to a voltage difference between the AC power supply voltage detected by said power supply voltage sensor and the target voltage command.
Dependencies are inferred from the claim text.