Power system operation plan creation assistance device and method

Patent metadata

Field	Value
Publication number	US-12438367-B2
Application number	US-202118038123-A
Country	US
Kind code	B2
Filing date	Jul 19, 2021
Priority date	Dec 4, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A power system operation plan creation assistance device and method capable of maintaining or improving system stability or economy includes an optimization target snapshot power flow determination unit that uses one or more pieces of foundational information to determine an optimization target snapshot power flow. The foundational information includes a power generation plan, a total demand prediction, a sales plan, a renewable energy prediction, a work stoppage plan, system data, and a setting value. A system manipulation variable candidate extraction unit uses the one or more pieces of foundational information and the optimization target snapshot power flow to extract a candidate for a variable for a variable manipulating the system. An optimal system configuration calculation unit uses the one or more pieces of foundational information and the system manipulation variable candidate to calculate an optimal system configuration.

First claim

The invention claimed is:

1. A power system operation plan creation assistance device characterized by comprising:
an optimization target snapshot power flow determining unit which determines snapshot power flows for which to execute optimization using one or more data sets of basic information comprising power generation plans, total demand predictions, sales plans, renewable energy resources predictions, outage plans, system data, and settings;
a system switching variable candidate extracting unit which extracts candidates of system switching variables using snapshot power flows for which to execute optimization determined by the optimization target snapshot power flow determining unit and one or more data sets of the basic information;
an optimal system configuration calculating unit which calculates optimal system configurations using system switching variable candidates extracted by the system switching variable candidate extracting unit and one or more data sets of the basic information;
a stability and economy evaluating unit which evaluates stability and economy using operation plans as optimal system configurations calculated by the optimal system configuration calculating unit and one or more data sets of the basic information; and
a display unit which displays on screen, evaluation results obtained by the stability and economy evaluating unit and the operation plans.

2. The power system operation plan creation assistance device according to claim 1 , characterized in that the optimization target snapshot power flow determining unit obtains maximum and minimum values, up to a set rank, among results of a total demand prediction, a renewable energy resources prediction, a residual demand prediction, and a prediction by a percentage of non-synchronous generators and time points before and after start of each of planned outage events and narrows down targets for which to execute calculations to snapshot power flows corresponding to what points of time for a particular period.

3. The power system operation plan creation assistance device according to claim 1 , characterized in that the system switching variable candidate extracting unit extracts system switching variable candidates by creating switching patterns and executing fault current calculations under a base case and under execution of an switching pattern.

4. The power system operation plan creation assistance device according to claim 1 , characterized in the optimal system configuration calculating unit obtains optimal system configurations using one or more of optimal power flow calculation, optimal power flow calculation with constraints, system switching optimization calculation, system switching optimization calculation with constraints, power flow calculation, and power flow calculation with constraints.

5. The power system operation plan creation assistance device according to claim 1 , characterized by calculating and displaying information to be set for existing protection devices at the same time in conjunction with one of the optimal system configurations calculated using the system switching variable candidates.

6. The power system operation plan creation assistance device according to claim 1 , characterized in that the display unit displays on screen, switching patterns and their related system's Key Performance Indicators and stability margins, an outage plan, and a parallel power supply connection plan among others.

7. The power system operation plan creation assistance device according to claim 1 , characterized in that the display unit displays a graph in which a plotted line of a fault current through a circuit breaker observed at multiple locations under a basic configuration of a power system is displayed along with a circuit breaker capacity and a plotted line of the fault current through a circuit breaker observed at the multiple locations upon an alteration to the power system configuration by switching of a circuit breaker is also displayed in the graph.

8. A power system operation plan creation assistance method that is implemented with a computer, characterized by comprising:
an optimization target snapshot power flow determining step which determines snapshot power flows for which to execute optimization using one or more data sets of basic information comprising power generation plans, total demand predictions, sales plans, renewable energy resources predictions, outage plans, system data, and settings;
a system switching variable candidate extracting step which extracts candidates of system switching variables using snapshot power flows for which to execute optimization determined by the optimization target snapshot power flow determining step and one or more data sets of the basic information;
an optimal system configuration calculating step which calculates optimal system configurations using system switching variable candidates extracted by the system switching variable candidate extracting step and one or more data sets of the basic information;
a stability and economy evaluating step which evaluates stability and economy using operation plans as optimal system configurations calculated by the optimal system configuration calculating unit and one or more data sets of the basic information; and
a displaying step which displays on screen, evaluation results obtained by the stability and economy evaluating step and the operation plans.

9. A power system operation plan creation assistance method according to claim 8 that is implemented with a computer, characterized by:
extracting candidates of system switching variables and snapshot power flows at which to observe changes in a fault current using demand predictions, renewable energy resources predictions, power generation predictions, outage plans, and system data; seeking a solution by optimal power flow calculation or system switching optimization calculation using the system switching variables and generator output variables at all alternations made by each of the system switching variables; and displaying a degree of reliability, system's Key Performance Indicators, and operation plans.

Assignees

• Hitachi Ltd

Inventors

• Kuroda Eisuke
• Tsunedomi Kunihiko
• Nishimura Daiki
• Ohara Shinya
• Tada Yasuyuki

Classifications

• H02J2103/35

  Grid-level management of power transmission or distribution systems, e.g. load flow analysis or active network management · CPC title

• H02J2103/30

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

• H02J2101/20

  Dispersed power generation using renewable energy sources · CPC title

• H02J13/10

  characterised by displaying of information or by user interaction, e.g. supervisory control and data acquisition [SCADA] systems · CPC title

• H02J3/381

  Dispersed generators · CPC title