Load Shedding Control System and Load Shedding Method Based on Distributed Feeder Automation

A feeder automation and load shedding technology, applied in information technology support systems, power network operating system integration, emergency treatment AC circuit layout, etc., can solve problems such as large power grid, active power shortage, and commutation failure

Active Publication Date: 2019-10-18
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +5
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation of large-scale DC transmission projects also brings new challenges to the safe and stable operation of the power grid. Commutation failures caused by AC system failures are the main problems that may arise
If the failure of commutation leads to bipolar blocking of multiple DC circuits at the same time, there will be a large amount of active power shortage in the power grid, resulting in a drop in power grid frequency, and may even lead to system frequency collapse

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Load Shedding Control System and Load Shedding Method Based on Distributed Feeder Automation
  • Load Shedding Control System and Load Shedding Method Based on Distributed Feeder Automation
  • Load Shedding Control System and Load Shedding Method Based on Distributed Feeder Automation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Such as figure 1 As shown, the system is designed according to the five-layer architecture of the regional power grid frequency control main station, load shedding control master station, load shedding control substation, load shedding execution station and distributed feeder automation subsystem. The specific functions are as follows:

[0108] Regional power grid frequency control central station: The grid frequency control central station can be set up in the UHV converter station. After the high-power DC power loss, the grid frequency control central station is responsible for formulating control strategies according to the amount of DC power loss. According to multi-DC coordinated control and pumped storage The priority of unit control and fast load shedding control is to issue load shedding total capacity commands to the load shedding control master station.

[0109] Load shedding control master station: The load shedding control master station can be installed in ...

Embodiment 2

[0116] Embodiment 2 Based on the IEC 61850 emergency precise load shedding control system model

[0117] According to the modeling idea of ​​IEC 61850, each terminal device in the distributed feeder automation subsystem includes SERVER object, LD logical device and LN logical node. The modeling includes two service access points: S1 (MMS service) and G1 (GOOSE service). A SERVER class is modeled at the G1 access point, which adopts the subscriber / publisher communication mode for communication between feeder terminals. The distributed feeder automation function establishes a proprietary LD, and the instance name is "FDIR". In addition to the common LLN0 and LPHD LNs of LD, the FDIR object also includes OSFA (distributed feeder automation function), TSFA (test function), MSFA (status information) three logical nodes. In order to realize the emergency precise load shedding control function, a new ALDS (load shedding function) logical node is added.

[0118] Table 1 Logical node...

Embodiment 3

[0121] Embodiment 3 Working Mode of Emergency Precise Load Shedding Control System Based on Distributed Feeder Automation

[0122] The emergency precise load shedding control system based on distributed feeder automation provides two working modes, priority mode and topology mode. The two modes can be used independently or in conjunction with each other.

[0123] 3-1 priority mode

[0124] Priority mode is suitable for 10kV power distribution network including ring main unit nodes. Such as figure 2 As shown, according to the importance of the load carried by the power distribution branch circuit of the ring main unit, the load is divided into multiple levels, such as A-level load, B-level load, and C-level load. This mode can cut off the specified level of load in the power supply area, and realize the precise load shedding based on the load priority.

[0125] Such as image 3 As shown, the distributed feeder terminal installed at the ring main unit calculates the load c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an emergency precise load shedding control system and a load shedding method based on distributed feeder automation, including a regional power grid frequency control main station, a load shedding control master station, multiple load shedding control sub-stations, multiple load shedding execution stations and Distributed feeder automation subsystem; the distributed feeder automation subsystem includes multiple power stations installed on each 10kV feeder and distributed feeder terminals on each distribution network branch. The present invention uses the idea of ​​layered autonomy to calculate and locate the load shedding layer by layer to the feeder terminal at the bottom layer to complete the matching between the load shedding required and the actual load shedding. At the same time, the invention changes the centralized load shedding control idea of ​​the traditional power grid safety and stability control device with the 110kV line as the object, and takes the 10kV interruptible load as the load shedding control object, realizing the millisecond-level precise load shedding control of the large-scale 10kV distribution network layer , to solve the problem of under-cutting or over-cutting of 110kV centralized load shedding, which can alleviate the problem of frequency instability after bipolar blocking faults of multi-DC receiving end power grids, and ensure the safe and stable operation of large power grids.

Description

technical field [0001] The invention relates to the technical field of power system safety and stability control, in particular to an emergency and precise load shedding control system and a load shedding method based on distributed feeder automation. Background technique [0002] With the rapid development of high-voltage AC and DC power grids and the continuous integration of large-scale renewable energy into the power system, the time-varying and complex problems of the operation mode of complex large power grids have become increasingly prominent, which has greatly increased the operational risks and control difficulties of the power grid. In my country, the eastern coastal economically developed areas represented by Jiangsu Province have relatively concentrated power loads, while the power generation capacity is relatively scarce due to local energy resources and environmental constraints, so that the power grid is heavily dependent on external power sources. In recent ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14H02H7/26
CPCH02H7/262H02J3/001H02J3/14Y02B70/3225Y04S20/222
Inventor 杨毅袁宇波李兆拓李祝昆李虎成徐伟高磊张小易
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap