Inverter control strategy for a transient heavy load
AssigneeSchneider Electric It Corporation
InventorsWei-Hsiang Lin, Xiaojun Wang, Yongshuai Bao
Life of this patent
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Abstract
A power converter system including a DC bus, a DC/DC converter coupled to the DC bus, an inverter coupled to the DC bus and configured to convert DC power from the DC bus into output AC power having an output current, an output coupled to the inverter and configured to provide the output AC power to a load, and at least one controller configured to identify an impending high-load transient state at the output, and in response to identifying the impending high-load transient state, reduce a peak value of the output current of the output AC power by operating the DC/DC converter to reduce a voltage level on the DC bus and increasing a duty cycle of the inverter.
Claims23
A power converter system, comprising:
- a DC bus;
- a DC/DC converter coupled to the DC bus;
- an inverter coupled to the DC bus and configured to convert DC power from the DC bus into output AC power having an output current;
- an output coupled to the inverter and configured to provide the output AC power to a load;
- and
- at least one controller configured to identify an impending high-load transient state at the output, and in response to identifying the impending high-load transient state, reduce a peak value of the output current of the output AC power by operating the DC/DC converter to reduce a voltage level on the DC bus and increasing a duty cycle of the inverter.
A non-transitory computer-readable medium storing thereon sequences of computer-executable instructions for controlling a power converter system including a DC bus, a DC/DC converter coupled to the DC bus, and an inverter coupled to the DC bus, the sequences of computer-executable instructions including instructions that instruct at least one processor to:
- identify an impending high-load transient state at an output of the power converter system;
- and
- operate, in response to identifying the impending high-load transient state, the DC/DC converter to reduce a voltage level on the DC bus and the inverter with an increased duty cycle to reduce a peak value of an output current of the power converter system.
An Uninterruptible Power Supply (UPS), the UPS comprising:
- an input configured to receive input AC power;
- an output configured to provide output AC power having an output current to a load;
- a backup power input configured to receive backup DC power from a backup power source;
- a DC/DC converter coupled to the backup power input and configured to convert the backup DC power into DC power;
- a DC bus coupled to the DC/DC converter and configured to receive DC power from the DC/DC converter;
- an inverter coupled to the output and configured to convert DC power from the DC bus into the output AC power;
- and
- at least one controller configured to identify an impending high-load transient state at the output, and in response to identifying the impending high-load transient state, reduce a peak value of the output current of the output AC power by operating the DC/DC converter to reduce a voltage level on the DC bus and increasing a duty cycle of the inverter.
Dependencies are inferred from the claim text.