Supply-demand balance controller

• US 8,571,720 B2
• Filed: 03/24/2011
• Issued: 10/29/2013
• 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
• Primary Examiner(s): Jarrett, Ryan A.
• Assistant Examiner(s): SCAPIN, MICHAEL JOSEPH
• Application Number:
  US13/071,030
• Publication Number:
  US 20120065792A1
• Time in Patent Office: 950 Days
• Field of Search: 700/291
• 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 customers, power demand data showing power consumed by customer appliances, the customer appliances including a controllable appliance whose power consumption can be controlled from an external point;

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

a first predicting unit configured to predict power demand of the customers in the predetermined period, based on the history in the first storage;

a second storage configured to store predictive power demand of the customers predicted by the first predicting unit;

a first reliability value calculator configured to calculate first reliability values that are reliability values of the predictive power demand of the customers such that the first reliability value of each customer becomes larger as dispersion or standard deviation of differences between the power demand of the customers in the first storage and the predictive power demand of the customers in the second storage becomes smaller;

a power receiving unit configured to receive power 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 supplied by each power generating unit of power received from the power system;

a third storage configured to store a history of power supplied by each power generating unit;

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

a fourth storage configured to store data of predictive supplied power of each of the power generating units;

a second reliability value calculator configured to calculate second reliability values that are reliability values of the predictive supplied power of the power generating units such that the second reliability value of each power generating unit becomes larger as dispersion or standard deviation of differences between the supplied power of the each power generating unit in the third storage and the predictive supplied power of the each power generating unit in the fourth storage becomes smaller;

a reliability-level-based demand aggregator configured to classify the customers into a plurality of groups based on the first reliability values;

a reliability-level-based supply/power generation aggregator configured to classify the power generating units into the groups based on the second reliability values;

a balancing unit configured to calculate, for each of the groups, a difference between a first sum of the predictive power demand of the customers belonging to the group and a second sum of the predictive supplied power of the power generating units belonging to the group, and to calculate a sum of calculated differences multiplied by weights assigned to the groups to obtain a supply-demand margin level; and

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

2. The supply-demand balance controller 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 supply-demand balance controller 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 the plan for controlling a request for additional power supply to the power system in the predetermined period based on the supply-demand margin level.

4. The supply-demand balance controller of claim 2,

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

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

the plan creator further creates the plan for controlling charge and discharge of the power storage device in the predetermined period based on the supply-demand margin level.

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

wherein the collection controller collects data of the power demand that represent power consumed by each of the customer appliances,

the first storage stores a history of the power demand of the customer appliances,

the first predicting unit predicts power demand consumed by each of the customer appliances based on the history of the power demand of the customer appliances,

the first reliability value calculator calculates reliability values of the predictive power demand of the customer appliances as the first reliability values,

the reliability-level-based demand aggregator classifies the customer appliances into the groups based on the reliability values;

the balancing unit calculates the first sum of each of the groups as a sum of the predictive power demand of the customer appliances belonging to each of the groups.

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

wherein the collection controller collects data of power generation by power generators in the customers, at least one of the customers holding at least one power generator,

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

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

the second storage stores data on predictive generation power of the customers,

the first reliability value calculator calculates reliability values of the predictive generation power of the customers, based on a difference between generation power in the first storage and predictive generation power in the second storage,

the reliability-level-based supply/power generation aggregator classifies the customers into the groups based on the reliability values of the predictive generation power of the customers;

the balancing unit calculates, for each of the groups, a difference between the first sum and a total of the second sum and a third sum of the predictive generation power of the customers classified to the group and calculates a sum of calculated differences multiplied by weights assigned to the groups to obtain a supply-demand margin level.

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

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

the first predicting unit calculates predictive generation power of each power generator based on the history of the power generation,

the first reliability value calculator calculates reliability values of the predictive generation power of the power generators, and

the reliability-level-based supply/power generation aggregator classifies the power generators into the groups based on the reliability values of the predictive power of the power generators;

the balancing unit calculates the third sum of each of the groups as a sum of the predictive generation power of the power generators classified to the group.

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

wherein the balancing unit calculates a supply-demand margin level of a long period including both the predetermined period and one or more period following the predetermined period, and

the plan creator creates the plan in the predetermined period based on the supply-demand margin level of the predetermined period and the supply-demand margin level of the long period.

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

wherein the collection controller shortens a sampling interval of the power demand data acquired from the consumer'"'"'s appliances as the first reliability value of the customer become lower, and lengthens the sampling interval of the power demand data acquired from the consumer'"'"'s appliances as the first reliability value of the customer become higher.

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

wherein a possible range of the first reliability values is sectioned into a plurality of intervals,

the groups to which the customers belongs is determined depending on whether the first reliability values of the customers each are included in which interval, and

a higher weight is assigned to the group of the interval of higher first reliability values.

11. The supply-demand balance controller of claim 10,

wherein the balancing unit is further configured to:

calculate a standard deviation of the predictive power demand in each of the intervals by using the predictive power demand falling within each of the intervals,

correct the predictive power demand of each customer by adding a multiplied value between the standard deviation of the interval including the first reliability value of the customer and a coefficient assigned to the interval wherein a higher coefficient is assigned to the interval including higher first reliability values, and

calculate the first sum by using the corrected predictive power demand.