Load Leveling System of Power System

• US 20130054040A1
• Filed: 08/17/2012
• Published: 02/28/2013
• Est. Priority Date: 08/23/2011
• Status: Active Grant

• Current Assignee: Hitachi, Ltd., Tohoku Electric Power Company Incorporated
• Original Assignee: Hitachi, Ltd., Tohoku Electric Power Company Incorporated
• Inventors: Takahashi, Hirotaka, Tomita, Yasushi, Oda, Takashi, Isozaki, Eri, Onishi, Tsukasa, Horikoshi, Kazuhiro, Matsuda, Katsuhiro
• Granted Patent: US 9,478,986 B2
• Time in Patent Office: Days
• US Class Current: 700/291
• CPC Class Codes: H02J 2310/58 The condition being electrical
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• CPC Class Codes: H02J 3/144 Demand-response operation of the power transmission or distribution network
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

It is an object of the present invention to provide a load leveling system of a power system capable of attaining load leveling in a distribution substation unit and a method thereof. Disclosed is a load leveling system of a power system with a controller having a major customer and lower transforming apparatus, and with a customer connected to the lower transforming apparatus via a low-voltage line. The system also has a communication unit between the customer and its own system, and control use time zones of devices within the customer; an electric demand prediction unit, and a first load leveling processing unit. By employing such an arranged system, it becomes possible to provide a load leveling system of a power system capable of realizing load leveling of both a distribution substation unit and a pole transformer unit.

Claims

1. A load leveling system of a power system comprising:

a function of being applied to the power system including a major customer and lower transforming apparatus connected to an upper transforming apparatus via a high-voltage line and a customer connected to the lower transforming apparatus via a low-voltage line, arranging a communication unit between the customer and its own system, and outputting change request information of an operation time of devices within the customer;

a prediction function of predicting at least electric demands of the upper transforming apparatus and the lower transforming apparatus; and

a function of outputting the change request information of the operation time of devices within the customer so as to reduce a maximum value of electric demands of both the upper transforming apparatus and the lower transforming apparatus.

2. The load leveling system of a power system according to claim 1, further comprising:

an electric demand prediction unit configured to divide a future electric demand into an adjustable demand and a non-adjustable demand and calculate them in each time zone at least in the lower transforming apparatus and the upper transforming apparatus;

a first load leveling processing unit configured to set an electric demand target within a maximum electric demand, dispersion-shift a demand larger than the electric demand target to other time zones, and distribute the demand larger than the electric demand target to the lower transforming apparatus with regard to the electric demand of the upper transforming apparatus from the electric demand prediction unit;

a second load leveling processing unit configured to correct an electric demand of the lower transforming apparatus from the electric demand prediction unit with the electric demand distributed by the first load leveling processing unit, reduce a maximum electric demand after the correction by a predetermined amount to set a new target, and repeat a correction while confirming that the electric demand of the upper transforming apparatus in the time zone at the time of shifting the reduced demand to a minimum demand time zone is not larger than the electric demand target; and

an output unit configured to distribute an electric demand in each time zone determined by the second load leveling processing unit to each device within the customer and control a use time zone of the devices within the customer through a communication unit.

3. The load leveling system of a power system according to claim 2, wherein the electric demand target is set according to a maximum value of a non-adjustable demand.

4. The load leveling system of a power system according to claim 2, wherein a minimum demand time zone for shifting a reduced demand in the second load leveling processing unit is set as a time zone except the time zone set as an electric demand target in the first load leveling processing unit.

5. The load leveling system of a power system according to claim 3, wherein a minimum demand time zone for shifting a reduced demand in the second load leveling processing unit is set as a time zone except the time zone set as an electric demand target in the first load leveling processing unit.