# US 2018/0323644 A1 · Partition-compostion method for online detection of transient stability and the equipment thereof

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- Number: US 2018/0323644 A1
- Document ID: US20180323644A1
- Status: Published application
- Kind: A1
- Application number: 15/747,537
- Filed: 2015-08-28
- Published: 2018-11-08
- Earliest claimed: 2015-07-28
- Assignees: Tianjin University
- Applicants: Tianjin University
- Inventors: Hongjie JIA; Shuai ZHAO; Dazhong FANG; Yuan ZENG; Xiangyu KONG
- Web page: https://patentgrep.com/patent/US20180323644A1

## CPC

- H02J 3/00144: {using phasor measuring units [PMU]}
- H02J 2103/30: Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks
- Y02E 40/70: Smart grids as climate change mitigation technology in the energy generation sector
- Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y04S 10/22: Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
- Y04S 40/20: Information technology specific aspects, e.g. CAD, simulation, modelling, system security
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

## Abstract

The present invention comprises a partition-composition method and its equipment for online detection of transient stability of interconnected power system. The method consists of three parts. Firstly, according to the dynamic response data of the generators at the actual time, the key parameters of transient stability analysis of local areas can be obtained from local dispatch control center based on the wide area measurement system. Secondly, the key parameters of entire grid can be obtained using the uploaded parameters from the local area. Lastly, using the partition-composition method, parameters of an adjoint power system of the entire grid can be obtained. The equipment consists of 4 modules, including the first obtained module, transport module, the second obtained module and the composition module. Using these modules, transient stability data of entire grid can be obtained exactly without the limitation of network topology, system model and parameters. The present invention can be a beneficial and potential tool for the online analysis of power system transient stability with higher computation speed and lower storage requirement.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A partition-composition method for online detection of transient stability of interconnected power system, including following steps:
Step 1: acquiring the dynamic response data of nk generators in the actual operation time, and obtaining the feature parameters for transient stability analysis of local area grid from the local dispatch control center based on WAMS;
Step 2: uploading feature parameters of all the local area grids to the dispatch control center of the entire grid, and obtaining the parameters for transient stability analysis of entire grid;
Step 3: calculating feature vector of an adjoint power system (hereinafter referred to as APS) of entire grid according to the partition-composition theorem of APS;
wherein, the partition-composition theorem of APS can be expressed as:
composing the vector X of an entire grid by feature vector Xk, sum vector Vk, feature vector Dk and MT,k of all the local area grids.

### Claim 12 (depends on 11)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 11, wherein the dynamic response data include: rotor angle, rotor speed, rotor acceleration, center of inertia (hereinafter referred to as COI), electrical power output and mechanical power.

### Claim 13 (depends on 11)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 11, wherein the feature parameters for transient stability analysis of local area grid include feature vector of APS and feature vector of COI of local area grid.

### Claim 14 (depends on 11)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 11, wherein the feature parameters for transient stability analysis of local area grid further include the sum vector composed of the sum of angle, sum of speed and sum of acceleration of all generators in the local area grid.

### Claim 15 (depends on 11)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 11, wherein the feature parameters for transient stability analysis of entire grid include feature vector of APS and feature vector of COI of entire grid.

### Claim 16 (depends on 15)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 15, wherein the feature vector of COI of entire grid is the composition of the feature vectors of COI of all the local area grids.

### Claim 17 (depends on 14)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 14, wherein the step 3 further includes the step of:
obtaining the feature vector of the APS of entire grid by composing the parameters for transient stability analysis and the sum vector for transient stability analysis of entire grid.

### Claim 18

A partition-composition equipment for online detection of transient stability of interconnected power system includes following modules:
a first acquisition module, which is utilized for acquiring the dynamic response data of nk generators in the actual operation time, and obtaining the feature parameters for transient stability analysis of local area grid from the local dispatch control center based on WAMS;
a transmission module, which is utilized for transmitting the feature parameters of transient stability analysis of all the local areas to the dispatch control center of the entire grid;
a second acquisition module, which is utilized for obtaining feature parameters of transient stability analysis of the entire grid;
a composition module, which is utilized for composing the feature vector of the APS of entire grid according to the partition-composition theorem of the APS;
wherein, the partition-composition theorem of APS can be expressed as: composing the vector X of an entire grid by feature vector Xk, sum vector Vk, feature vector Dk and MT,k of all the local area grids.

### Claim 19 (depends on 18)

The partition-composition equipment for online detection of transient stability of interconnected power system according to claim 18,
wherein the feature parameters of transient stability of the local area grid include:
feature vector of the APS and feature vector of COI of the local area grid;
the feature parameters of transient stability of the local area grid further include:
sum vector composing of the sum of the angle, the sum of speed and the sum of acceleration of all generators in the local area grid.

### Claim 20 (depends on 18)

The partition-composition equipment for online detection of transient stability of interconnected power system according to claim 18,
wherein the feature parameters of transient stability of the entire grid include:
feature vector of the APS and feature vector of COI of the entire grid;
in particular, the feature vector of COI of the entire grid is the composition of the feature vectors of COI of all the local area grids;
the composition module includes:
a composition sub module, which is utilized for composing the feature vector of the APS of entire grid according to the feature parameter and the sum vector of transient stability analysis of the entire grid.

### Claim 21 (depends on 13)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 13, wherein the feature parameters for transient stability analysis of local area grid further include the sum vector composed of the sum of angle, sum of speed and sum of acceleration of all generators in the local area grid.

### Claim 22 (depends on 12)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 12, wherein the feature parameters for transient stability analysis of entire grid include feature vector of APS and feature vector of COI of entire grid.

### Claim 23 (depends on 13)

The partition-composition method for online detection of transient stability of interconnected power system according to claim 13, wherein the feature parameters for transient stability analysis of entire grid include feature vector of APS and feature vector of COI of entire grid.

### Claim 24 (depends on 19)

The partition-composition equipment for online detection of transient stability of interconnected power system according to claim 19,
wherein the feature parameters of transient stability of the entire grid include:
feature vector of the APS and feature vector of COI of the entire grid;
in particular, the feature vector of COI of the entire grid is the composition of the feature vectors of COI of all the local area grids;
the composition module includes:
a composition sub module, which is utilized for composing the feature vector of the APS of entire grid according to the feature parameter and the sum vector of transient stability analysis of the entire grid.