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US 12,015,304 B2Granted
Power supply system, power supply method, control apparatus, and computer storage medium
AssigneeHuawei Digital Power Technologies Co., Ltd.
InventorsZhou Shu, Ran Li
Life of this patent
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Abstract
A power supply system includes a plurality of parallelly-connected uninterruptible power supplies (UPSs), where each UPS collects a first current of the UPS within a collection period in a first duration. In a current equalization period in the first duration, a direct current to alternating current conversion module is controlled to output a first compensation current, where the first compensation current includes at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components.
Claims20
A power supply system, comprising:
- an uninterruptible power supply (UPS) comprising:
- an input terminal configured to:
- couple to a power grid using a first node, and
- receive an alternating current from the power grid;
- an output terminal configured to couple to a load using a second node;
- a bypass switch circuit comprising:
- a first terminal coupled to the input terminal;
- and
- a second terminal coupled to the output terminal, wherein the bypass switch circuit is configured to connect the power grid to the load;
- a direct current to alternating current (DC-AC) conversion circuit, wherein the DC-AC conversion circuit is connected to the output terminal, and wherein the DC-AC conversion circuit is configured to:
- receive a first control instruction;
- and
- output a current to the output terminal in response to the first control instruction;
- a collection point node disposed between the first node and the second node;
- a collection circuit connected to the collection point node, wherein the collection circuit is configured to:
- receive a second control instruction;
- and
- collect a current at the collection point node in response to the second control instruction;
- and
- a control circuit configured to:
- send the first control instruction to the DC-AC conversion circuit;
- send the second control instruction to the collection circuit;
- control, in a collection period in a first duration, the collection circuit to collect a first current at the collection point node;
- determine at least one of a harmonic component or a reactive current component of the first current;
- control, in a current equalization period in the first duration, the DC-AC conversion circuit to output a first compensation current, wherein the current equalization period partially overlaps the collection period, wherein the first compensation current comprises at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components, wherein the first quantity is less than or equal to a second quantity of harmonic components of the first current, wherein the first compensation reactive current component in the first quantity of first compensation harmonic components has a same frequency and an opposite amplitude as the harmonic component of the first current, and wherein the first compensation reactive current component has a same frequency and an opposite amplitude as the reactive current component;
- and
- adjust a second duration in which the bypass switch circuit connects the power grid to the load to balance second currents output by output terminals of different UPSs in a plurality of UPSs or balance third currents output by bypass switch circuits of the different UPSs.
24 more elements
A power supply method, comprising:
- controlling, in a collection period in a first duration, a collection circuit to collect a first current at a collection point node,
- determining at least one of a harmonic component or a reactive current component of the first current;
- controlling, in a current equalization period in the first duration, a direct current to alternating current (DC-AC) conversion circuit to output a first compensation current, wherein the current equalization period partially overlaps the collection period, wherein the first compensation current comprises at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components, wherein the first quantity is less than or equal to a second quantity of harmonic components of the first current, wherein the first compensation reactive current component in the first quantity of first compensation harmonic components has a same frequency and opposite amplitudes as the harmonic component of the first current, and wherein the first compensation reactive current component has a same frequency and an opposite amplitude as the reactive current component;
- and
- adjusting a second duration in which a bypass switch circuit connects a power grid to a load, to balance second currents output by output terminals of different UPSs in a plurality of UPSs, or balance third currents output by bypass switch circuits of the different UPSs.
2 more elements
A non-transitory computer-readable storage medium storing computer-executable instructions that when executed by a processor of a control apparatus of an uninterruptible power supply (UPS), cause the control apparatus to be configured to:
- control, in a collection period in a first duration, a collection circuit to collect a first current at a collection point node;
- determine at least one of a harmonic component or a reactive current component of the first current;
- control, in a current equalization period in the first duration, a direct current to alternating current (DC-AC) conversion circuit to output a first compensation current, wherein the current equalization period partially overlaps the collection period, wherein the first compensation current comprises at least one of a first compensation reactive current component or a first quantity of first compensation harmonic components, wherein the first quantity is less than or equal to a second quantity of harmonic components of the first current, wherein the first compensation reactive current component in the first quantity of first compensation harmonic components has a same frequency and opposite amplitudes as the harmonic component of the first current, and wherein the first compensation reactive current component has a same frequency and opposite amplitudes as the reactive current component;
- and
- adjust a second duration in which a bypass switch circuit connects a power grid to a load, to balance second currents output by output terminals of different UPSs in a plurality of UPSs, or balance third currents output by bypass switch circuits of the different UPSs.
2 more elements
Dependencies are inferred from the claim text.