SUPPLY-DEMAND BALANCE CONTROLLER

• US 20120065792A1
• Filed: 03/24/2011
• Published: 03/15/2012
• Est. Priority Date: 09/09/2010
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: YONEZAWA, Minoru, Nishimura, Nobutaka, Otsuki, Tomoshi, Sakamaki, Yoshiyuki
• Granted Patent: US 8,571,720 B2
• Time in Patent Office: Days
• US Class Current: 700/291
• CPC Class Codes: H02J 2203/20 Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
• CPC Class Codes: H02J 2310/54 according to a pre-established time schedule
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

A first predicting unit predicts a power demand required by each customer. A first reliability value calculator calculates the reliability value of the predictive power demand for each customer. Predicted power supply from a power system is calculated with respect to each power generating unit. A second reliability value calculator calculates the reliability value of the predictive power supply for each power generating unit. A balancing unit obtains a supply-demand margin level based on the difference between: a first weighted sum obtained by performing weighted sum on the predictive power demand and a weight depending on the reliability value; and a second weighted sum obtained by performing weighted sum on the predictive power supply and a weight depending on the reliability value. A plan creator creates a plan for controlling power used by the controllable appliance of the customer based on the supply-demand margin level.

Claims

1. A supply-demand balance controller for creating a power supply plan in a predetermined period, comprising:

a collection controller configured to collect, from each customer, power demand data showing power consumed by customer appliances in customer'"'"'s buildings, the customer appliances including a controllable appliance whose power consumption can be controlled from outside;

a first storage configured to store a history of the power demand of each customer;

a first predicting unit configured to predict a power demand by each customer in the predetermined period, based on the history in the first storage;

a second storage configured to store a predictive power demand obtained by the first predicting unit;

a first reliability value calculator configured to calculate a reliability value for the predictive power demand obtained by the first predicting unit with respect to each customer, based on a difference between the power demand previously stored in the first storage and the predictive power demand previously obtained by the first predicting unit with respect to the previous power demand;

a power receiving unit configured to receive power supply from a power system, the power system generating power with a plurality of power generating units;

a distribution unit configured to distribute the power received at the power receiving unit to the customers;

a power supply acquiring unit configured to acquire data concerning power supply from the power system with respect to each power generating unit;

a third storage configured to store a history of power supply with respect to each power generating unit;

a second predicting unit configured to predict power to be supplied in the predetermined period with respect to each power generating unit, based on the history stored in the third storage;

a fourth storage configured to store data of predictive power supply obtained by the second predicting unit;

a second reliability value calculator configured to calculate a reliability value for the predictive power supply obtained by the second predicting unit with respect to each power generating unit, based on a difference between the power supply previously stored in the third storage and the predictive power supply previously obtained by the second predicting unit with respect to the previous power supply;

a balancing unit configured to obtain a supply-demand margin level based on a difference between;

a first weighted sum of the predictive power demand calculated by the first predicting unit by weight depending on the reliability value calculated by the first reliability value calculator; and

a second weighted sum of the predictive power supply calculated by the second predicting unit by a weight depending on the reliability value calculated by the second reliability value calculator; and

a plan creator configured to create a plan for controlling power used by the controllable appliances of each customer in the predetermined period, based on the supply-demand margin level.

2. The device of claim 1, wherein the plan creator creates the plan so that the supply-demand margin level in the predetermined period falls within a predetermined range.

3. The device of claim 2, further comprising an addition requesting unit configured to request additional power supply to the power system,

wherein the plan creator further creates a plan for controlling a request for additional power supply to the power system.

4. The device of claim 2,

wherein the power receiving unit can charge the power storage with power received from the power system,

the distribution unit can distribute, to the customers, power stored in the power storage, and

the plan creator further creates a plan for controlling charge and discharge of the power storage.

5. The device of claim 1,

wherein the collection controller collects data of the power demand with respect to each customer appliance,

the first storage stores a history of the power demand with respect to each customer appliance,

the first predicting unit predicts power demand to be required with respect to each customer appliance,

the first reliability value calculator calculates a reliability value of the predictive power demand with respect to each customer appliance,

the balancing unit calculates the first weighted sum based on the predictive power demand of each customer appliance and a weight depending on the reliability value calculated by the first reliability value calculator.

6. The device of claim 1,

wherein the collection controller collects data of power generation generated by a power generator of the customer,

the first storage stores a history of the power generation with respect to each customer,

the first predicting unit predicts a power to be generated by each customer, based on the history of the power generation in the first storage,

the second storage stores the predictive power generation of each customer,

the first reliability value calculator calculates a reliability value of the predictive power generation with respect to each customer, based on a difference between the predictive power generation previously stored in the second storage and the power generation previously predicted by the first predicting unit with respect to the previous predictive power generation,

the supply-demand margin level shows a difference between the first weighted sum and a value, the value being obtained by summing the second weighted sum and a third weighted sum of the predictive power generation of each customer by a weight depending on the reliability value calculated by the first reliability value calculator.

7. The device of claim 6,

wherein the first storage stores a history of the power generation with respect to each power generator,

the first predicting unit calculates a predictive power generation with respect to each power generator,

the first reliability value calculator calculates a reliability value of the predictive power generation with respect to each power generator, and

the balancing unit calculates the third weighted sum based on the predictive power generation of each power generator and a weight depending on the reliability value calculated by the first reliability value calculator.

8. The supply-demand balance controller of claim 1,

wherein the balancing unit calculates first and second supply-demand margin levels respectively for a first time interval as the predetermined period and a second time interval including the predetermined period and one or more periods following the predetermined period, and

the plan creator creates a plan in the first time interval based on the first supply-demand margin level and the second supply-demand margin level.

9. The supply-demand balance controller of claim 1, wherein the collection controller more shortens a sampling interval for acquiring the power demand data as the reliability value previously calculated for the customer or customer appliance becomes lower.

10. The device of claim 1,

wherein a possible value of the reliability value is divided into a plurality of ranges, and

the weight value is determined depending on the range including the calculated reliability value.

11. The device of claim 10,

wherein the balancing unit performs:

calculating a standard deviation the predictive power demand by using the predictive power demand of the customer appliance falling within the range with respect to each of the ranges,

correcting the predictive power demand of the customer appliance by adding a value obtained by multiplying the standard deviation by a predetermined coefficient with respect to each of the ranges, and

calculating the first weighted sum by using the predictive power demand corrected with respect to each customer appliance.