POWER-DISTRIBUTION-SYSTEM VOLTAGE CONTROL SYSTEM, POWER-DISTRIBUTION-SYSTEM VOLTAGE CONTROL METHOD, AND CENTRALIZED VOLTAGE CONTROL APPARATUS
First Claim
1. A power-distribution-system voltage control system comprising:
- a distribution line of a high-voltage system from which a power distribution system of the high-voltage system is configured and to which a low-voltage system including a distributed power supply is connected;
a plurality of voltage control devices that are connected to the distribution line and control a voltage of the distribution line;
local voltage control apparatuses that are connected to the voltage control devices, respectively, and adjust a control amount of the voltage control devices every second cycle, which is shorter than a first cycle, such that a voltage value controlled by the voltage control devices is maintained within a range of a voltage upper limit value and a voltage lower limit value that are updated every first cycle; and
a centralized voltage control apparatus that includes a voltage-upper-and-lower-limit-values determining unit that is connected to each of the local voltage control apparatuses via a communication network, determines the voltage upper limit value and the voltage lower limit value that are updated every first cycle by the local voltage control apparatuses, and issues, via the communication network, a command to each of the local voltage control apparatuses setting the voltage upper limit value and the voltage lower limit value.
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Accused Products
Abstract
A centralized voltage control apparatus calculates an optimum voltage distribution in a centralized control cycle period and determines, based on the relationship between the optimum voltage distribution and a proper voltage range, voltage upper and lower limit values for which a command is issued to each local voltage control apparatus taking into account voltage upper and lower limit margin amounts at respective points in a voltage control responsible range of the local voltage control apparatus for each local voltage control apparatus. The local voltage control apparatus adjusts, based on the voltage upper and lower limit values commanded from the centralized voltage control apparatus via a communication network, a control amount of a voltage control device every local control cycle shorter than the centralized control cycle period, to maintain the control voltage of the voltage control device between the voltage upper and lower limit values.
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Citations
11 Claims
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1. A power-distribution-system voltage control system comprising:
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a distribution line of a high-voltage system from which a power distribution system of the high-voltage system is configured and to which a low-voltage system including a distributed power supply is connected; a plurality of voltage control devices that are connected to the distribution line and control a voltage of the distribution line; local voltage control apparatuses that are connected to the voltage control devices, respectively, and adjust a control amount of the voltage control devices every second cycle, which is shorter than a first cycle, such that a voltage value controlled by the voltage control devices is maintained within a range of a voltage upper limit value and a voltage lower limit value that are updated every first cycle; and a centralized voltage control apparatus that includes a voltage-upper-and-lower-limit-values determining unit that is connected to each of the local voltage control apparatuses via a communication network, determines the voltage upper limit value and the voltage lower limit value that are updated every first cycle by the local voltage control apparatuses, and issues, via the communication network, a command to each of the local voltage control apparatuses setting the voltage upper limit value and the voltage lower limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. (canceled)
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10. A centralized voltage control apparatus that is connected, via a communication network, to each of local voltage control apparatuses of a power distribution system that includes a distribution line of a high-voltage system from which the power distribution system of the high-voltage system is configured and to which a low-voltage system including a distributed power supply is connected, a plurality of voltage control devices that are connected to the distribution line and control a voltage of the distribution line, and the local voltage control apparatuses that are connected to the voltage control devices, respectively, and adjust a control amount of the voltage control devices every second cycle, which is shorter than a first cycle, such that a voltage value controlled by the voltage control devices is maintained within a range of a voltage upper limit value and a voltage lower limit value that are updated every first cycle, the apparatus comprising a voltage-upper-and-lower-limit-values determining unit that determines the voltage upper limit value and the voltage lower limit value that are updated every first cycle by the local voltage control apparatuses and issues, via the communication network, a command to each of the local voltage control apparatuses setting the voltage upper limit value and the voltage lower limit value.
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11. A local voltage control apparatus that is connected to a voltage control device that is connected to a distribution line of a high-voltage system, from which a power distribution system of the high-voltage system is configured and to which a low-voltage system including a distributed power supply is connected, and controls a voltage of the distribution line, and that is connected, via a communication network, to a centralized voltage control apparatus that determines a voltage upper limit value and a voltage lower limit value every first cycle and issues, via the communication network, a command setting the voltage upper limit value and the voltage lower limit value, wherein
the local voltage control apparatus adjusts a control amount of the voltage control device every second cycle, which is shorter than a first cycle, such that a voltage value controlled by the voltage control device is maintained within a range of the voltage upper limit value and the voltage lower limit value that are updated every first cycle based on a command from the centralized voltage control apparatus.
Specification