US 2025/0158418 A1Published application

Dc power distribution system

AssigneeMitsubishi Electric Corporation

InventorsYusuke KATO, Kenichi FUKUNO

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Abstract

Provided is a DC power distribution system in which power loss is small even when DC grid voltage and load supply voltage are greatly different. This DC power distribution system includes an AC-DC converter, a first sensor which detects generated power of a power generation device, a load DC-DC converter, a second sensor which detects load supply power, and a switchover command generation unit which switches between two operation modes of the AC-DC converter. In an operation mode 1, voltage of a DC grid is set to be higher than a value obtained by multiplying a voltage effective value of AC power by the square root of 2. When generated power is smaller than load supply power, the switchover command generation unit reduces voltage of the DC grid and switches the operation mode from the operation mode 1 to an operation mode 2.

Claims11

Dependent claims

A DC power distribution system comprising:

an AC-DC converter having a forward power flow function of converting AC power inputted from a power grid to DC power and outputting the DC power to a DC grid, and a reverse power flow function of converting DC power from the DC grid to AC power and outputting the AC power to the power grid;
a first sensor which detects generated power of a power generation device connected to the DC grid;
a load DC-DC converter which supplies power to a load connected to the DC grid;
a second sensor which detects power supplied from the DC grid to the load DC-DC converter and the load;
and
a switchover command generation circuitry which generates a command for switching between two operation modes of the AC-DC converter, wherein
the two operation modes are an operation mode 1 in which the reverse power flow function of the AC-DC converter is enabled, and an operation mode 2 in which the reverse power flow function of the AC-DC converter is disabled,
in the operation mode 1, voltage of the DC grid is set to be higher than a value obtained by multiplying a voltage effective value of the AC power by a square root of 2, and
in a case where the generated power of the power generation device detected by the first sensor is smaller than the power supplied to the load DC-DC converter and the load, which is detected by the second sensor, the switchover command generation circuitry reduces the voltage of the DC grid and switches the operation mode of the AC-DC converter from the operation mode 1 to the operation mode 2.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/837,314Filed 17 Jun 2022
Published: 15 May 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02J 4/25
Networks integrating separated AC and DC power sections: for transfer of electric power between AC and DC networks, e.g. for supplying the DC…
H02J 3/003
Circuit arrangements for AC mains or AC distribution networks: load forecast, e.g. methods or systems for forecasting future load demand
H02J 3/004
Circuit arrangements for AC mains or AC distribution networks: generation forecast, e.g. methods or systems for forecasting future energy generation
H02J 3/38
Circuit arrangements for AC mains or AC distribution networks: arrangements for feeding a single network from two or more generators or sources in…

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