Load scheduling optimization in distributed system

• US 9,634,488 B2
• Filed: 05/12/2010
• Issued: 04/25/2017
• Est. Priority Date: 06/26/2009
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited (Hitachi, Ltd.)
• Original Assignee: ABB Schweiz AG (ABB Limited)
• Inventors: Sundaram, Senthil Kumar, Selvaraj, Gopinath, Kundanagar, Rohini Suresh, Narayanan, Venkateswaran
• Primary Examiner(s): Everett, Christopher E
• Application Number:
  US13/380,712
• Publication Number:
  US 20120109400A1
• Time in Patent Office: 2,540 Days
• CPC Class Codes: G06Q 10/04 Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem" market predictions or forecasting for commercial activities G06Q30/0202
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 13/00018 using phone lines
• CPC Class Codes: H02J 13/00024 by means of mobile telephony
• CPC Class Codes: H02J 13/00026 involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 2203/20 Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• 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
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

A power distribution management system is disclosed for optimal power distribution for a predetermined class of loads and other loads. The power distribution management system include a substation for distributing power supply to a load network, where the load network includes the predetermined class of loads and other loads and the substation includes a plurality of feeders. The power distribution management system includes an optimizer for generating an optimal load schedule for a control period for the predetermined class of loads. The power distribution management system also includes a communication interface for communicating between the plurality of individual loads and/or the optimizer.

Claims

1. A power distribution management system for managing distribution of electrical power in a distribution network including a predetermined class of loads and other loads, the power distribution management system comprising:

a substation including a plurality of feeders for distributing power to the predetermined class of loads and to the other loads, wherein the predetermined class of loads communicates with the power distribution management system through one or more communication devices;

an optimizer for generating a priori an optimal load schedule of individual loads of the predetermined class of loads, wherein the optimal load schedule is derived using an objective function with constraints that minimizes a difference between a power supply quota for the predetermined class of loads and power consumed by the predetermined class of loads over a period of time, wherein the power supply quota is power committed for the predetermined class of loads from total power available for distribution to the predetermined class of loads and to the other loads, wherein the difference between the power supply quota and the power consumed is minimized by scheduling an adequate number of individual loads from the predetermined class of loads according to a power demand of the individual loads of the predetermined class of loads, and wherein the constraints include at least one of (i) a total ON time constraint indicative of a total time of power required by each individual load of the predetermined class of loads, and (ii) a minimum ON time constraint indicative of a minimum time for which power is to be scheduled to each individual load of the predetermined class of loads; and

a communication interface for communication with at least one of the individual loads and the optimizer, wherein the optimal load schedule is communicated to the individual loads through the communication interface,

wherein the power distribution management system is for managing the individual loads of the predetermined class of loads, the distribution network, and the plurality of feeders based on the optimal load schedule.

2. The power distribution management system of claim 1, wherein at least one individual load from the predetermined class of loads is operated by the power distribution management system based on the optimal load schedule.

3. The power distribution management system of claim 1, wherein the constraints further include a power allowance constraint, and a time varying load constraint.

4. The power distribution management system of claim 1, wherein the optimizer is integral to at least one of a power distribution network management system, a substation management system in the substation, or both the power distribution network management system and a substation management system.

5. The power distribution management system of claim 1, wherein the communication interface is for registering identity information of the individual loads from the predetermined class of loads.

6. The power distribution management system of claim 5, wherein the identity information of the individual loads comprises:

at least information on a type and rating of an individual load and information on the communication device.

7. The power distribution management system of claim 1, wherein the optimizer is configured to ensure that at least one feeder associated with the predetermined class of loads is always available to supply power to the predetermined class of loads.

8. The power distribution management system of claim 1, wherein the power distribution management system is for receiving at least one of identity information, power requirement information, power utilized information, or a combination thereof from at least one of the individual loads.

9. The power distribution management system of claim 1, wherein the power distribution management system is for sending at least one of an optimal schedule information, tariff information, information for approval, instruction to operate information, or the combination thereof to at least one of the individual loads.

10. The power distribution management system of claim 1, wherein the power distribution management system is for reconfiguring one or more feeders of the plurality of feeders based on the optimal load schedule.

11. A method for optimal power distribution to a predetermined class of loads, wherein a power distribution management system manages distribution of electrical power in a distribution network including the predetermined class of loads and other loads, the method comprising:

receiving information of a power supply quota for the predetermined class of loads at an optimizer of the power distribution management system, wherein the power supply quota is power committed for the predetermined class of loads from total power available for distribution to the predetermined class of loads and to the other loads;

receiving information of power demand by individual loads of the predetermined class of loads at a communication interface of the power distribution management system, wherein each individual load of the predetermined class of loads communicates with the power distribution management system through one or more communication devices;

deriving a priori, at the optimizer, an optimal load schedule for individual loads of the predetermined class of loads with an objective function with constraints that minimizes a difference between the power supply quota for the predetermined class of loads and power consumed by the predetermined class of loads over a period of time, wherein the difference is minimized by scheduling an adequate number of individual loads from the predetermined class of loads, and wherein the constraints include at least one of (i) a total ON time constraint indicative of a total time of power required by each individual load of the predetermined class of loads, and (ii) a minimum ON time constraint indicative of a minimum time for which power is to be scheduled to each individual load of the predetermined class of loads;

communicating the optimal load schedule to the individual loads of the predetermined class of loads through the communication interface of the power distribution management system; and

managing the distribution network and a plurality of feeders that distribute power to the predetermined class of loads and to the other loads based on the optimal load schedule.

12. The method for load scheduling of claim 11 comprising:

receiving feedback from respective users of the individual loads; and

using the feedback from the respective users of the individual loads to generate a final optimal load schedule.

13. The method of claim 11, wherein the power distribution to the other loads is based on pre-defined priorities.