Charge/discharge control method for charge/discharge element and charge/discharge control device for charge/discharge element

Patent metadata

Field	Value
Publication number	US-11984726-B2
Application number	US-202118276602-A
Country	US
Kind code	B2
Filing date	Feb 10, 2021
Priority date	Feb 10, 2021
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A charge/discharge control method for a charge/discharge element includes receiving a request value (Pfr) of a frequency adjustment capacity according to a system frequency (f) of an electric power system ( 10 ) based on a priority degree (β) and the request value (Pfr) being received, the priority degree indicating a degree at which charging or discharging of an own element (EV 1 ) is prioritized over charging or discharging of another charge/discharge element (EV 2 , EV 3 , . . . ), correcting the output property to increase an upper limit value or a lower limit value of an output range as the priority degree (β) is higher, and performing charging or discharging with an output determined based on a deviation (Δf) between the system frequency (f) measured at a connection end to the electric power system ( 10 ) and a reference frequency (fref) of the electric power system ( 10 ) and the output property after the correction.

First claim

The invention claimed is:

1. A charge/discharge control method for a charge/discharge element, comprising:
receiving a request value of a frequency adjustment capacity according to a system frequency of an electric power system, the request value being broadcast-transmitted to a plurality of charge/discharge elements connected to an electric wire of the electric power system;
determining an output property of charging/discharging with respect to the system frequency, based on a priority degree and the request value being received, the priority degree indicating a degree at which charging or discharging of an own element is prioritized over charging or discharging of another charge/discharge element;
correcting the output property to increase an upper limit value or a lower limit value of an output range as the priority degree is higher; and
performing charging or discharging with an output determined based on a deviation between the system frequency measured at a connection end to the electric power system and a reference frequency of the electric power system and the output property after the correction.

2. The charge/discharge control method for a charge/discharge element according to claim 1 , wherein
a difference between a theoretical value of a charge/discharge output of all the plurality of charge/discharge elements and an actual value of a charge/discharge output of all the plurality of charge/discharge elements that is measured in the electric power system is received through broadcast-transmission with respect to all the plurality of charge/discharge elements, the theoretical value being a value according to a deviation between an actual measurement value of the system frequency and the reference frequency when each of the plurality of charge/discharge elements performs charging or discharging with the output property being determined, and
the output property is corrected to reduce the frequency adjustment capacity when the difference being received indicates that the actual value is higher than the theoretical value, and is corrected to increase the frequency adjustment capacity when the difference being received indicates that the actual value is lower than the theoretical value.

3. The charge/discharge control method for a charge/discharge element according to claim 2 , wherein
a time change rate of the difference being received is calculated, and the output property is corrected to reduce the frequency adjustment capacity when a sign of the time change rate being calculated is positive, and is corrected to increase the frequency adjustment capacity when the sign of the time change rate is negative.

4. The charge/discharge control method for a charge/discharge element according to claim 2 , wherein
a frequency deviation change rate being a change rate of the difference being received, due to the deviation between the actual measurement value of the system frequency and the reference frequency, is calculated, and the output property is corrected to reduce the frequency adjustment capacity when a sign of the frequency deviation change rate being calculated is positive, and is corrected to increase the frequency adjustment capacity when the sign of the frequency deviation change rate is negative.

5. The charge/discharge control method for a charge/discharge element according to claim 1 , wherein
the request value being broadcast-transmitted separately between a charge side and a discharge side is received, the output property is determined and corrected separately between the charge side and the discharge side, based on the request value being received on each of the charge side and the discharge side, charging is performed with an output determined based on the output property after the correction on the charge side, and discharging is performed with an output determined based on the output property after the correction on the discharge side.

6. The charge/discharge control method for a charge/discharge element according to claim 1 , wherein
a charge/discharge control element among the plurality of charge/discharge elements that determines and corrects the output property with an output range present only on the charge side determines the output property, based on the priority degree and the request value being received, in such a way that a lower limit value of the output range present only on the charge side is a value equal to or greater than base electric power that is constantly supplied to a dark electric current load.

7. A charge/discharge control device for a charge/discharge element, comprising:
a reception unit configured to receive a request value of a frequency adjustment capacity according to a system frequency of an electric power system, the request value being broadcast-transmitted to a plurality of charge/discharge elements connected to an electric wire of the electric power system;
a priority degree calculation unit configured to calculate a priority degree indicating a degree at which charging or discharging of an own element is prioritized over charging or discharging of another charge/discharge element;
a property determination unit configured to determine an output property of charging/discharging with respect to the system frequency, based on the priority degree and the request value;
a property correction unit configured to correct the output property to increase an upper limit value or a lower limit value of an output range as the priority degree is higher; and
a control unit configured to control an output of charging or discharging in the electric power system to an output determined based on a deviation between the system frequency measured at a connection end to the electric wire and a reference frequency of the electric power system and the output property after the correction.

Assignees

• Nissan Motor
• Renault Sas

Inventors

• Suzuki Kenta
• Ikezoe Keigo
• Murai Kensuke

Classifications

• H02J13/1331

  using wireless data transmission · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title