Power network system, and power adjustment apparatus and method

Patent metadata

Field	Value
Publication number	US-9935459-B2
Application number	US-201414891816-A
Country	US
Kind code	B2
Filing date	May 8, 2014
Priority date	May 17, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A central control device is connected to a first power router including some power transmitting ends and a second power router including some power receiving ends, acquires, for each of the power receiving ends, received power information including identification information of each of the power transmitting ends and a value of supply power supplied from each of the power transmitting ends, and power supply priority information defining a priority for determining a power transmitting end for which an adjustment of the supply power to be supplied to each of the power receiving ends should be prioritized, determines a power transmitting end for which the supply power is adjusted from among the power transmitting ends based on the received power information and the priority defined in the power supply priority information, and adjusts the supply power in the determined power transmitting end.

First claim

The invention claimed is:

1. A power network system comprising a plurality of power cells each comprising a power router for asynchronous connection to a power grid, wherein
the power router comprises:
a DC bus maintained at a predetermined rated voltage;
a plurality of input/output end parts, one of connection ends of each of the input/output end parts being connected to the DC bus and the other of the connection ends serving as an external connection terminal and being connected to an external connection partner, each of the input/output end parts being configured to convert power between the one connection end and the other connection end; and
control unit that controls the plurality of input/output end parts,
at least first and second power routers among the plurality of power routers are connected to each other by respective input/output end parts,
some of the plurality of input/output end parts included in the first power router are used as a plurality of power transmitting ends,
each of the plurality of power transmitting ends supplies supply power to the second power router, the supply power being supplied from one of a plurality of power supply sources,
some of the plurality of input/output end parts included in the second power router are used as a plurality of power receiving ends,
each of the plurality of power receiving ends receives supply power through the DC bus and supplies the received power to one of a plurality of power demanders, the supply power being supplied from each of the plurality of power transmitting ends,
the power network system comprises a power adjustment apparatus connected to the first and second power routers through a communication network,
the power adjustment apparatus comprises power adjustment unit that adjusts the supply power according to a power request value requested in each of the plurality of power receiving ends, and
the power adjustment unit:
acquires, for each of the plurality of power receiving ends, received power information including identification information of each of the plurality of power transmitting ends and a value of supply power supplied from each of the plurality of power transmitting ends, and power supply priority information defining a priority for determining a power transmitting end for which an adjustment of the supply power to be supplied to each of the plurality of power receiving ends should be prioritized; and
determines a power transmitting end for which the supply power is adjusted from among the plurality of power transmitting ends based on the received power information and the priority defined in the power supply priority information.

2. The power network system according to claim 1 , wherein the power adjustment unit adjusts the supply power in the determined power transmitting end so as to bring a value of the received power in each of the power receiving ends closer to the power request value.

3. The power network system according to claim 1 , wherein the power adjustment unit:
adjusts, for each of the plurality of power receiving ends, the supply power of the power transmitting end having the highest priority, which is determined based on the received power information and the power supply priority information; and
determines, after the adjustment, the power transmitting end having a next highest priority as the power transmitting end for which the supply power is adjusted based on the received power information and the power supply priority information.

4. The power network system according to claim 1 , wherein
the received power information further includes attribute information of a supply source that supplies the supply power for each of the plurality of power transmitting ends,
in the power supply priority information, a priority of the attribute information is defined as a priority for determining the power transmitting end for which the adjustment should be prioritized for each of the plurality of power receiving ends, and
the power adjustment unit:
refers to the power supply priority information and specifies the attribute information corresponding to a predetermined priority; and
refers to the received power information and determines the power transmitting end corresponding to the specified attribute information.

5. The power network system according to claim 4 , wherein
the attribute information includes, for each of the plurality of power transmitting ends, a plurality of attribute types and attribute values corresponding to the respective attribute types,
the power supply priority information includes information in a case where different priorities of the attribute types or different priorities of the attribute values are defined among the plurality of power receiving ends.

6. The power network system according to claim 1 , wherein
the power adjustment unit:
calculates, for each of the plurality of power receiving ends, a difference between a current received power value and the power request value;
selects a priority to be processed in a descending order from the highest priority to the lowest priority based on the power supply priority information;
performs a determination process every time the priority to be processed is selected until the difference is cancelled out; and
adjusts the supply power in each of the plurality of power transmitting ends based on an adjustment value of the supply power determined by the determination process, and
the determination process comprises:
specifying the power transmitting end corresponding to the priority to be processed among the power transmitting ends included in the received power information for each of the plurality of power receiving ends;
specifying a value of the supply power supplied from the specified power transmitting end included in the current received power value based on the received power information and setting this specified supply power value as an increase/decrease request value for the specified power transmitting end;
calculating a total increase/decrease request value by summing up the increase/decrease request value sets for each of the plurality of power transmitting ends;
determining whether or not the total value of the current supply power value in each of the plurality of power transmitting ends and the total increase/decrease request value is within a predetermined threshold range;
determining, when the total value is determined to be within the threshold range, the increase/decrease request value set for each of the plurality of power transmitting ends as the adjustment value of the supply power for the power transmitting end for which the determination is made, and
correcting, when the total value is determined to be outside the threshold range, the increase/decrease request value set for each of the plurality of power transmitting ends so that it falls within the threshold range and determining the corrected increase/decrease request value as the adjustment value of the supply power for the power transmitting end for which the determination is made.

7. The power network system according to claim 1 , wherein when the power adjustment unit externally receives the power request value, the power adjustment means unit calculates a difference between the received power request value and the current received power value, and when the difference is equal to or greater than a predetermined value, adjusts the supply power.

8. The power network system according to claim 1 , wherein the power adjustment unit measures the current received power value in each of the plurality of power receiving ends at a predetermined interval, and when the difference between the measured received power value and the power request value is equal to or greater than a predete

Assignees

• Nec Corp

Inventors

• Kogo Takuma

Classifications

• H02J13/1337

  involving the use of Internet protocols · CPC title

• H02J13/1323 Primary

  using optical fibres · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H02J1/102

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title