Voltage/reactive power operation assisting device and assisting method, and voltage/reactive power operation monitoring control device and monitoring control method

Patent metadata

Field	Value
Publication number	US-10581245-B2
Application number	US-201716335278-A
Country	US
Kind code	B2
Filing date	Sep 4, 2017
Priority date	Oct 20, 2016
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

The setting range of the voltage and the reactive power of a power system is maintained during variations of voltage and power flow due to the output variation of renewable energy of a large number of power supplies which fluctuate due to weather. A voltage/reactive power operation assisting device is provided with a first database for storing the data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting the voltage/reactive power of a power system. A second database stores the device operation data of the individual control device; and the operation of the individual control device is predicted from the data stored in the first database to obtain individual control device operation prediction data. A display unit displays the individual control device operation prediction data and the device operation data in a contrastive manner.

First claim

The invention claimed is:

1. A voltage/reactive power operation assisting device comprising:
a first database for storing data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting a voltage/reactive power of a power system;
a second database for storing device operation data of the individual control device;
an individual control device operation prediction unit for predicting an operation of the individual control device from the data stored in the first database to obtain individual control device operation prediction data; and
a display unit for displaying the individual control device operation prediction data and the device operation data for comparison.

2. A voltage/reactive power operation assisting device comprising:
a first database for storing data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device for adjusting a voltage/reactive power of a power system;
a second database for storing device operation data of the individual control device;
an individual control device operation prediction unit for predicting an operation of the individual control device from the data stored in the first database to obtain individual control device operation prediction data;
a difference calculation unit for obtaining a difference between the individual control device operation prediction data and the device operation data; and
a display unit for displaying the difference.

3. The voltage/reactive power operation assisting device according to claim 2 , further comprising:
an evaluation target calculation unit that obtains the data to be evaluated by a power flow calculation using system measurement data and system facility data.

4. The voltage/reactive power operation assisting device according to claim 3 , further comprising:
a condition change calculation unit for calculating data to be evaluated again in the evaluation target calculation unit by changing a condition using the difference data.

5. The voltage/reactive power operation assisting device according to claim 3 , further comprising:
a prediction calculation unit for obtaining prediction calculation result data that stores voltage, active power, reactive power, and the like of each node of the power system as time series data, wherein a power flow calculation using system measurement data and system facility data in the evaluation target calculation unit is executed.

6. The voltage/reactive power operation assisting device according to claim 1 , wherein
the individual control device operation prediction unit includes one or more of:
an operation region determination unit for determining an operation region of an individual control device when using data to be evaluated;
an evaluation target distance calculation unit for calculating an evaluation target distance; and
an operation time prediction calculation unit for predicting operation time.

7. A voltage/reactive power operation monitoring control device for providing individual control device target value data to an individual control device which is installed in a power system to adjust a voltage/reactive power of the power system, the voltage/reactive power operation monitoring control device comprising:
a first database for storing data to be evaluated, target value data, individual control device control method data, and individual control device data of an individual control device that adjusts a voltage/reactive power of a power system;
a second database for storing device operation data of the individual control device;
an individual control device operation prediction unit for predicting an operation of the individual control device from the data stored in the first database to obtain individual control device operation prediction data; and
a transmit unit that transmits a function for transmitting the individual control device operation prediction data to the individual control device as individual control device target value data.

8. The voltage/reactive power operation monitoring control device according to claim 7 , further comprising:
an evaluation target calculation unit for obtaining the data to be evaluated by a power flow calculation using system measurement data and system facility data.

9. The voltage/reactive power operation monitoring control device according to claim 8 , further comprising:
a condition change calculation unit for calculating the data to be evaluated again in the evaluation target calculation unit by changing a condition using difference data between the individual control device data and the device operation data.

10. The voltage/reactive power operation monitoring control device according to claim 8 , further comprising:
a prediction calculation unit for obtaining prediction calculation result data that stores voltage, active power, reactive power, and the like of each node of the power system as time series data, wherein a power flow calculation using the system measurement data and the system facility data in the evaluation target calculation unit is executed.

11. The voltage/reactive power operation monitoring control device according to claim 7 , wherein
the individual control device for adjusting the voltage/reactive power of the power system is configured to include a transformer tap and a phase adjustment facility, and to control an operating point within a predetermined dead zone width, and
the voltage/reactive power operation monitoring control device includes a dead zone width calculation unit for calculating the dead zone width determined by the transformer tap and the phase adjustment facility and sends the dead zone width determined by the dead zone width calculation unit to the individual control device as the individual control device target value data.

12. A voltage/reactive power operation assisting method comprising:
storing data to be evaluated, target value data, individual control device control method data, individual control device data, and device operation data of an individual control device for adjusting a voltage/reactive power of a power system;
obtaining individual control device operation prediction data by predicting an operation of the individual control device from the data to be evaluated, the target value data, the individual control device control method data, and the individual control device data;
and displaying the individual control device operation prediction data and the device operation data for comparison.

13. A voltage/reactive power operation assisting method comprising:
storing data to be evaluated, target value data, individual control device control method data, individual control device data, and device operation data of an individual control device for adjusting a voltage/reactive power of a power system;
obtaining individual control device operation prediction data by predicting an operation of the individual control device from the data to be evaluated, the target value data, the individual control device control method data, and the individual control device data;
obtaining a difference between the individual control device operation prediction data and the device operation data; and
displaying the difference.

14. A voltage/reactive power operation monitoring control method for providing individual control device target value data to an individual control device which is installed in a power system to adjust a voltage/reactive power of the power system, the method comprising:
storing data to be

Assignees

• Hitachi Ltd

Inventors

• Kuroda Eisuke
• Saito Nao
• Hara Kouichi
• Yatsu Masahiro
• Kawahara Taichiro
• OMI Shota

Classifications

• H02J3/381

  Dispersed generators · CPC title

• Y04S10/22

  Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units · CPC title

• H02J13/00

  Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network · CPC title

• H02J3/00

  Circuit arrangements for AC mains or AC distribution networks · CPC title

• Y02E40/30

  Reactive power compensation · CPC title