Emergency and precise load shedding control system and method based on distributed feeder line automation

A feeder automation and control system technology, used in information technology support systems, emergency protection circuit devices, power network operating system integration, etc., can solve problems such as active power shortage, grid frequency drop, and large grid.

Active Publication Date: 2017-09-05
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +5
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  • 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

Method used

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  • Emergency and precise load shedding control system and method based on distributed feeder line automation
  • Emergency and precise load shedding control system and method based on distributed feeder line automation
  • Emergency and precise load shedding control system and method based on distributed feeder line automation

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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...

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PUM

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Abstract

The invention discloses an emergency and precise load shedding control system and method based on distributed feeder line automation. The emergency and precise load shedding control system comprises a regional power grid frequency control master station, a load shedding control master station, multiple load shedding control substations, multiple load shedding executing stations and a distributed feeder line automation subsystem. The distributed feeder line automation subsystem comprises multiple power supply stations provided with 10kV feeder lines and distributed feeder line terminals of distribution network branch circuits. The emergency and precise load shedding control system and system applies a hierarchical self-governing thought to calculate load shedding capacity layer by layer, position the capacity to the bottom-layer feeder line terminals and complete matching of required load shedding capacity and actual load shedding capacity. In addition, a centralized load shedding control thought using a 110kV line as an object of a traditional power grid safety stable-control device is changed, while 10kV interruptible load is used as a load shedding control object, millisecond-class precise load shedding control of a large-scale 10kV distribution network layer is achieved, the problem that the 110kV centralized load shedding is insufficient or excessive is solved, the problem of frequency instability after bipolar locking breakdown of multiple direct current receiving-end power grids can be relieved, and safe and stable operation of large power grids is ensured.

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

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Application Information

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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
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