Evaluation device, evaluation method, and evaluation program for power storage system

Patent metadata

Field	Value
Publication number	US-10466664-B2
Application number	US-201514926767-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Oct 30, 2014
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

An evaluation device carries out evaluation for BESS that is a power storage system that includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery. The evaluation device includes an information acquisition unit that acquires input information including at least specification information relating to specifications of the BESS, an estimation unit that estimates a life of the battery and a pecuniary profit in compensation for the service on the basis of the input information that is acquired by the information acquisition unit, and an optimization unit that determines a value of a control parameter, which is optimal for control of an operation of the BESS, on the basis of the life of the battery and the pecuniary profit which are estimated by the estimation unit.

First claim

What is claimed is:

1. An evaluation device for evaluating a power storage system which includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery, the evaluation device comprising:
an information acquisition unit that acquires input information including at least specification information of the power storage system;
an estimation unit that estimates a life of the battery and a pecuniary profit in compensation for the power stabilization service provided with respect to the power transmission network by using the battery on the basis of the input information including the specification information of the power storage system that is acquired by the information acquisition unit, demand information relating to a charge and discharge power demand with respect to the power storage system, price information relating to a price of the power stabilization service, and control parameter information relating to a control parameter; and
an optimization unit that determines a value of the control parameter, which is optimal for control of an operation of the power storage system, on the basis of the life of the battery and the pecuniary profit in compensation for the power stabilization service to suppress variation in a frequency or a voltage of power that flows through the power transmission network, which are estimated by the estimation unit.

2. The evaluation device for a power storage system according to claim 1 ,
wherein the estimation unit includes,
an element model unit that obtains charge and discharge power in accordance with the control parameter that is used to charge and discharge the battery in the power storage system, power consumption that is consumed in the power storage system, and a current and a state of charge of the battery in accordance with the charge and discharge power on the basis of the input information,
a battery deterioration model unit that predicts a deterioration state of the battery in the future and obtains the life of the battery on the basis of the current and the state of charge which are obtained by the element model unit, and
a profit calculation unit that calculates the pecuniary profit that is obtained in a predetermined unit period on the basis of the charge and discharge power and the power consumption which are obtained by the element model unit.

3. The evaluation device for a power storage system according to claim 2 ,
wherein the optimizing unit includes,
an accumulated profit calculation unit that accumulates the pecuniary profit for each unit period which is calculated by the profit calculation unit, and calculates a total accumulated profit of the power storage system which is obtained during the life of the battery, and
a comparison unit that compares a plurality of the total accumulated profits which are calculated in accordance with values of control parameters different from each other, and
wherein a value of an optimal control parameter is determined on the basis of a comparison result of the comparison unit.

4. The evaluation device for a power storage system according to claim 2 ,
wherein the element model unit obtains the charge and discharge power on the basis of the demand information and the control parameter information, and obtains the power consumption, the current, and the state of charge on the basis of the charge and discharge power and the specification information.

5. The evaluation device for a power storage system according to claim 2 ,
wherein the profit calculation unit calculates the pecuniary profit that is obtained in the unit period on the basis of the demand information, the price information, the charge and discharge power, and the power consumption.

6. The evaluation device for a power storage system according to claim 1 , further comprising:
a data storage unit that stores a relationship between the control parameter, the life of the battery, and the pecuniary profit.

7. The evaluation device for a power storage system according to claim 1 ,
wherein output information for display of a screen, which illustrates a comparison result of the pecuniary profit for each control parameter, is output.

8. An evaluation method for a power storage system which includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery, the method comprising:
allowing a computer to acquire input information including at least specification information of the power storage system;
allowing the computer to estimate a life of the battery and a pecuniary profit in compensation for the power stabilization service provided with respect to the power transmission network by using the battery on the basis of the input information including the specification information of the power storage system that is acquired, demand information relating to a charge and discharge power demand with respect to the power storage system, price information relating to a price of the power stabilization service, and control parameter information relating to a control parameter; and
allowing the computer to determine a value of the control parameter, which is optimal for control of an operation of the power storage system, on the basis of the life of the battery and the pecuniary profit in compensation for the power stabilization service to suppress variation in a frequency or a voltage of power that flows through the power transmission network, which are estimated.

9. An evaluation program for evaluating a power storage system which includes a chargeable and dischargeable battery and provides a power stabilization service with respect to a power transmission network by using the battery, the evaluation program allowing a computer to execute:
a process of acquiring input information including at least specification information of the power storage system;
a process of estimating a life of the battery and a pecuniary profit in compensation for the power stabilization service provided with respect to the power transmission network by using the battery on the basis of the input information including the specification information of the power storage system that is acquired, demand information relating to a charge and discharge power demand with respect to the power storage system, price information relating to a price of the power stabilization service, and control parameter information relating to a control parameter; and
a process of determining a value of the control parameter, which is optimal for control of an operation of the power storage system, on the basis of the life of the battery and the pecuniary profit in compensation for the power stabilization service to suppress variation in a frequency or a voltage of power that flows through the power transmission network, which are estimated.

Assignees

• Hitachi Ltd

Inventors

• Matthey Fanny
• Takeda Kenji
• KAMIJOH Takashi
• Nagashima Yuuji

Classifications

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• G06Q10/06375

  Prediction of business process outcome or impact based on a proposed change · CPC title

• H02J3/008

  Circuit arrangements for power supply or distribution technologies responsive to energy trading · CPC title

• Y02E40/10

  Flexible AC transmission systems [FACTS] · CPC title

• Y04S50/10

  Energy trading, including energy flowing from end-user application to grid · CPC title