# US 10,122,174 B2 · Parallelization method for black-start subsystems of power grid with external support

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,122,174 B2
- Document ID: US10122174B2
- Status: Granted
- Kind: B2
- Application number: 15/151,052
- Filed: 2016-05-10
- Published: 2016-09-01
- Granted: 2018-11-06
- Earliest claimed: 2013-12-27
- Assignees: State Grid Corporation of China; Economic & Technology Research Institute of Hubei Electric Power Company; Central China Grid Company Limited
- Applicants: State Grid Corporation of China; Economic & Technology Research Institute of Hubei Electric Power Company; Central China Grid Company Limited
- Inventors: Jingyou Xu; Qing Chang; Chunming Wang; Hanping Xu; Youping Xu; Jisheng Li; Dawei Huang; Xiuwen Xiong
- Web page: https://patentgrep.com/patent/US10122174B2

## CPC

- H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
- G05B 17/02: electric
- H02J 2103/30: Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks
- Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- 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
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- 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 invention relates to a parallelization method for black-start subsystems of a power grid with external support, which includes, after power blackout, partitioning the power grid into subsystems, and respectively performing black-start on the subsystems based on a power grid black-start research scheme, performing stability check on each subsystem, performing voltage calculation on parallel lines between the subsystems, checking the parallelizing simulation of the subsystems, and determining a feasible parallelizing path and a recommendable charging direction. The method further includes, starting from the subsystems having external support and higher stability, networking them with an external power grid, parallelizing the networked subsystems having external support to obtain a subnet of the subsystems, parallelizing subsystems having no external support with the subnet of the subsystems to obtain a regional subnet, and finally parallelizing the remaining subsystems with the regional subnet to implement parallelization of black-start subsystems of the whole power grid.

## Claims

### Claim 1

A parallelization method for black-start subsystems of a power grid with external support, comprising the steps of:
(A) after the power grid blackout, partitioning the power grid into subsystems, and respectively performing black-start on the subsystems, according to a black-start research scheme;
(B) performing stability check on each subsystem having restoration to more than 30% of a normal load by using power system simulation software, so as to obtain a stable level of each subsystem;
(C) continuously restoring load for an unstable subsystem, and performing stability check once when every 5% of the normal load is increased, so as to obtain stable levels of the subsystems, until the subsystems are all stable;
(D) performing voltage calculation on parallel lines between the subsystems by using power system simulation software, primarily determining unavailable parallel paths so as to obtain primary available parallel paths, and selecting a charging direction having a lower terminal charging voltage as a charging direction;
(E) performing parallel simulation check on the primary available parallel paths obtained in step (D) by using power system simulation software, and further determining unavailable parallel paths so as to obtain available parallel paths; and
(F) parallelizing black-start subsystems of the power grid with external support according to the following sequence:
(F1) networking a subsystem having an external support and a relatively high stability level with an external power grid;
(F2) networking a subsystem having an external support and a relatively low stability level with the external power grid;
(F3) parallelizing the networked subsystems having external support, so as to obtain a subnet of the subsystems having external support;
(F4) parallelizing a subsystem having no external support and a relatively high stability level with the subnet of the subsystems having external support, so as to obtain a regional subnet;
(F5) parallelizing a subsystem having no external support and having a relatively low stability level with the regional subnet, so as to obtain a large regional subnet;
(F6) parallelizing the remaining subsystems with the large regional subnet, so as to implement parallelization of black-start subsystems of the whole power grid; and
(F7) in each of the above networking and parallelizing steps, if there exist multiple available paths between two subsystems, performing the corresponding step according to a sequence of overvoltage levels from low to high.

### Claim 2 (depends on 1)

The parallelization method according to claim 1, wherein the power system simulation software used in steps (B), (D) and (E) is PSASP, BPA, DSA or PSS/E.