Power control apparatus, power control system, and power control method

Patent metadata

Field	Value
Publication number	US-10714968-B2
Application number	US-201616082311-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	Mar 8, 2016
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A problem to be solved is to optimize a storage schedule in which changes in power (W) stored in an energy storage apparatus with time are determined, and an output upper limit (W) of a renewable energy power supply. In order to solve the problem, the invention provides a power control apparatus ( 10 ) that stores in an energy storage apparatus an amount of power exceeding an output upper limit instruction value (W), which is determined by an electricity company in power (W) generated by a power generation apparatus, the power control apparatus ( 10 ) including a decision unit ( 11 ) that decides a storage schedule in which changes in the power (W) to be stored in the energy storage apparatus with time within a predetermined period of time are determined, on the basis of prediction data on changes in the power (W) generated by the power generation apparatus with time within the predetermined period of time and values of various types of power classified on the basis of the output upper limit instruction value (W) within the predetermined period of time.

First claim

The invention claimed is:

1. A power control apparatus that stores an amount of power exceeding an output upper limit instruction value (W), which is determined by an electricity company in power (W) generated by a power generation apparatus, in an energy storage apparatus, the power control apparatus comprising:
at least one memory storing one or more instructions; and
at least one processor configured to execute the one or more instructions to:
decide a storage schedule in which changes in the power (W) to be stored in the energy storage apparatus with time within a predetermined period of time are determined, on the basis of the presence or absence of generation, generated amounts of power, and values of various types of power, the various types of power being classified on the basis of prediction data on changes in the power (W) generated by the power generation apparatus with time within the predetermined period of time, the output upper limit instruction value (W) within the predetermined period of time, the storage schedule in which changes in the power (W) to be stored in the energy storage apparatus with time within the predetermined period of time are determined, an output upper limit (W) of the power generation apparatus within the predetermined period of time,

wherein the various types of power comprise:
first power (W), corresponding to power not exceeding the output upper limit instruction value (W) in the power (W) generated by the power generation apparatus within the predetermined period of time;
third power (W), corresponding to power exceeding the output upper limit (W) in the power (W) generated by the power generation apparatus within the predetermined period of time;
second power (W), corresponding to power obtained by subtracting the third power (W) from power exceeding the output upper limit instruction value (W) in the power (W) generated by the power generation apparatus within the predetermined period of time; and
fourth power (W), corresponding to power obtained by subtracting the second power (W) from the power (W) to be stored in the energy storage apparatus on the basis of the storage schedule.

2. The power control apparatus according to claim 1 , wherein the at least one processor is further configured to decide the storage schedule by optimizing an objective function, the objective function being defined using the prediction data, the output upper limit instruction value (W), the values of the various types of power, the storage schedule, and the output upper limit (W), the objective function being maximized when the objective function relates to a gain, and the objective function being minimized when the objective function relates to a loss.

3. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule and the output upper limit (W) such that an evaluation value V=M1× a1+M2× a2−M3× a3+M4× a4 satisfies predetermined conditions, when an amount of first power is set to be M1 (Wh), a value thereof is set to be a1 (/Wh), an amount of second power is set to be M2 (Wh), a value thereof is set to be a2 (/Wh), an amount of third power is set to be M3 (Wh), a value thereof is set to be a3 (/Wh), an amount of fourth power is set to be M4 (Wh), and a value thereof is set to be a4 (/Wh).

4. The power control apparatus according to claim 3 , wherein the second power (W) is power (W) of which generation is supposed to be suppressed, in the power (W) to be stored in the energy storage apparatus within the predetermined period of time on the basis of the storage schedule, in a case where there is no process of storing an amount of power exceeding the output upper limit instruction value (W) in the energy storage apparatus.

5. The power control apparatus according to claim 3 , wherein the at least one processor is further configured to decide the storage schedule and the output upper limit (W) such that the evaluation value V is maximized.

6. The power control apparatus according to claim 5 , wherein the at least one processor is further configured to obtain the storage schedule for maximizing an objective function by using the evaluation value V as the objective function.

7. The power control apparatus according to claim 1 , wherein the at least one processor is further configured to decide the storage schedule such that a sum of the output upper limit instruction value (W) and the power (W) to be stored in the energy storage apparatus on the basis of the storage schedule is set to be equal to or less than the output upper limit (W) of the power generation apparatus within the predetermined period of time.

8. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule such that an amount of power (Wh) to be stored in the energy storage apparatus within the predetermined period of time on the basis of the storage schedule is set to be equal to or less than an amount of power (Wh) which can be stored in the energy storage apparatus within the predetermined period of time which is determined on the basis of state information on the energy storage apparatus.

9. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule such that the power (W) to be stored in the energy storage apparatus within the predetermined period of time on the basis of the storage schedule is set to be equal to or less than the power (W) which can be stored in the energy storage apparatus within the predetermined period of time which is determined on the basis of the state information on the energy storage apparatus.

10. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule by using data on a predicted probability distribution of generated power (W) at each point in time as the prediction data on the changes in the power (W) generated by the power generation apparatus with time within the predetermined period of time.

11. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule on the basis of the prediction data on the changes in the generated power (W) with time within a range of the predicted probability distribution of the generated power (W) at each point in time.

12. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to decide the storage schedule of each of a plurality of energy storage apparatuses in order to store an amount exceeding a total of the output upper limit instruction values (W) of a plurality of power generation apparatuses which are determined by the electricity company in a total of power (W) generated by the plurality of power generation apparatuses, in the plurality of energy storage apparatuses.

13. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to:
transmit the storage schedule to a storage control apparatus that controls operation of the energy storage apparatus, and
transmit the output upper limit (W) to a power generation control apparatus that controls operation of the power generation apparatus.

14. The power control apparatus according to claim 1 ,
wherein the at least one processor is further configured to increase the power (W) to be stored in the energy storage apparatus within the predetermined period of time as an accuracy of the prediction data increases, the accuracy of the prediction

Assignees

• Nec Corp

Inventors

• Homma Kosuke
• Kudo Koji
• Hashimoto Ryo

Classifications

• H02J3/466

  Scheduling or selectively controlling the operation of the generators or sources, e.g. connecting or disconnecting generators to meet a demand · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title

• H02J3/38 Primary

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• H02J7/34 Primary

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• Y02E70/30

  Systems combining energy storage with energy generation of non-fossil origin · CPC title