Patent
Load leveling system of power system
| العنوان: | Load leveling system of power system |
|---|---|
| Patent Number: | 9,478,986 |
| تاريخ النشر: | October 25, 2016 |
| Appl. No: | 13/588080 |
| Application Filed: | August 17, 2012 |
| مستخلص: | A load leveling system and a method for a power system are capable of attaining load leveling in a distribution substation unit. The load leveling system is for 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, as well as an electric demand prediction unit, and a first load leveling processing unit. By employing such a system, it becomes possible to provide a load leveling system for a power system that is capable of realizing load leveling of both a distribution substation unit and a pole transformer unit. |
| Inventors: | Takahashi, Hirotaka (Hitachinaka, JP); Tomita, Yasushi (Mito, JP); Oda, Takashi (Tokyo, JP); Isozaki, Eri (Chiba, JP); Onishi, Tsukasa (Hitachinaka, JP); Horikoshi, Kazuhiro (Sendai, JP); Matsuda, Katsuhiro (Sendai, JP) |
| Assignees: | Hitachi, Ltd. (Tokyo, JP), Tohoku Electric Power Co., Inc. (Sendai-shi, JP) |
| Claim: | 1. A load leveling system of a power system comprising: a lower transforming apparatus; an upper transforming apparatus; a high-voltage line; a low-voltage line; a communication unit; a load leveling device; an electric demand prediction unit configured to divide a future electric demand into an adjustable demand and a non-adjustable demand and calculate the adjustable and non-adjustable demands 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, 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 for at least one customer in accordance with an 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 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 a 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 at least one other customer and control a use time zone of the devices within the at least one other customer through a communication unit; wherein a major customer of the power system and the lower transforming apparatus are connected to the upper transforming apparatus via the high-voltage line, and the at least one other customer of the power system is connected to the lower transforming apparatus via the low-voltage line; wherein the communication unit is arranged for communication between the major customer and the at least one other customer; and wherein the load leveling device operates to predict, for each of said time zones, at least electric demands of the upper transforming apparatus and the lower transforming apparatus based on past data for electric demand of a day of conditions nearest to those of a prediction day and further added specific conditions, and output change request information of an operation time of devices within the at least one other customer, according to the prediction made by the load leveling device, so as to reduce a maximum value of electric demands of both the upper transforming apparatus and the lower transforming apparatus for each of the upper and lower transforming apparatuses respectively corresponding to either one of said adjustable demand or said non-adjustable demand. |
| Claim: | 2. The load leveling system of a power system according to claim 1 , wherein the electric demand target is set to a maximum value of a non-adjustable demand. |
| Claim: | 3. The load leveling system of a power system according to claim 1 , wherein a minimum demand time zone for shifting a reduced demand in the second load leveling processing unit is set as a time zone other than the time zone set as an electric demand target in the first load leveling processing unit. |
| Claim: | 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 other than the time zone set as an electric demand target in the first load leveling processing unit. |
| Patent References Cited: | 6624532 September 2003 Davidow et al. 7873441 January 2011 Synesiou et al. 2004/0218688 November 2004 Santhoff et al. 2010/0222934 September 2010 Iino et al. 2011/0035075 February 2011 Tomita et al. 2011/0060476 March 2011 Iino et al. 2011/0238232 September 2011 Tomita et al. 2011/0282505 November 2011 Tomita et al. 2002-010532 January 2002 2002-078203 March 2002 2002-369383 December 2002 2004-120919 April 2004 2005-086972 March 2005 2007-334523 December 2007 2010-068704 March 2010 2010-166636 July 2010 2010-270997 December 2010 2011-36084 February 2011 2012-55078 March 2012 WO 2011/121815 October 2011 WO 2012/098729 July 2012 |
| Other References: | “Smart Energy Consumption and the Smart Grid” by Siemens Industry, Inc. (Siemens USA website). cited by examiner Japanese Office Action dated Oct. 1, 2013 (Two (2) pages). cited by applicant |
| Assistant Examiner: | Kabir, Saad M |
| Primary Examiner: | Ali, Mohammad |
| Attorney, Agent or Firm: | Crowell & Moring LLP |
| رقم الانضمام: | edspgr.09478986 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |