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A hierarchical architecture control and protection system and protection method for flexible and direct power grids

A technology of control and protection, layered architecture, applied in emergency protection circuit devices, information technology support systems, electrical components, etc., can solve problems such as poor protection effect of flexible and direct power grid protection systems, and achieve complete control functions and complete interface protocol content. Effect

Active Publication Date: 2022-03-15
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor protection effect of the flexible direct grid protection system in the prior art, thereby providing a flexible direct grid layered architecture control protection system and protection method

Method used

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  • A hierarchical architecture control and protection system and protection method for flexible and direct power grids
  • A hierarchical architecture control and protection system and protection method for flexible and direct power grids
  • A hierarchical architecture control and protection system and protection method for flexible and direct power grids

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Embodiment 1

[0029] An embodiment of the present invention provides a control and protection system with a layered architecture of a flexible direct grid, such as figure 1 As shown, it includes: the upper master control station Control_S is responsible for controlling and coordinating the input and removal of the slave stations; the station control system PCP of the middle layer and the pole control and protection system CCP of the converter station are mutually independent devices, responsible for completing the overall control of the slave stations. The control and protection function communicates with the main control station as the control execution unit of the main control station; the lower slave station includes multiple flexible DC converter stations VSC_Sx (x=1---n), and the flexible DC converter station includes flexible direct converter stations converters and HVDC circuit breakers. Structural diagram of single-ended bipolar flexible DC converter station, such as figure 2 As s...

Embodiment 2

[0039] An embodiment of the present invention provides a control and protection method for a layered structure of a flexible DC power grid, which is mainly the logic of cutting and blocking the DC bus of the converter station, including: , current negative-sequence and zero-sequence content, and AC THD value, etc.), combined with the DC power transmission and reception of the slave station, determine whether the AC side of the converter station is a weak AC system, and if it is a weak system, reduce the DC power of the converter station Throughput, if it is judged that the AC side is an extremely weak system, the master control station will actively block the DC bus outlet of the converter station.

[0040] In the embodiment of the present invention, the master control station can also monitor the state of the AC system on the side of the converter station of the main AC main network, especially when the flexible direct grid is applied to new energy grid-connected occasions, mu...

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Abstract

The invention discloses a hierarchical architecture control and protection system and a protection method for a flexible and direct power grid. The system includes: an upper-level main control station responsible for controlling and coordinating the input and removal of slave stations; a middle-level station control system and pole control of a converter station. The protection system is an independent device. It is responsible for the overall control and protection function of the slave station and communicates with the master control station. It is the control execution unit of the master control station. The lower slave stations are multiple flex-to-dc converter stations, including flex-to-dc converter stations. and high-voltage DC circuit breakers. The master control station determines whether the AC side of the converter station is a weak AC system based on the upstream AC system status of the slave station and the DC power transmission and reception of the slave station. If so, it reduces the DC power take-out of the converter station and determines On the AC side, the main control station of the extremely weak system actively blocks the DC bus outlet of the converter station. The embodiments provided by the present invention not only control the DC bus voltage and power distribution of the flexible power grid, but also control the switching status of the slave stations, with complete interface protocol content and complete control functions.

Description

technical field [0001] The invention relates to the field of power electronics and power systems, in particular to a control and protection system and protection method of a layered architecture of a flexible DC power grid. Background technique [0002] With the continuous development of flexible DC transmission technology, flexible DC power grid has become an inevitable trend, the number of converter stations will also increase, and the mutual influence is also increasing. This puts forward the control strategy of converter stations. higher requirements. At present, the control strategies of multi-terminal flexible DC transmission (VSC-MTDC) systems based on voltage source converters mainly include master-slave control, voltage droop control, voltage margin control and their combination control, etc. Each control strategy has its own advantages and disadvantages. scope of application. [0003] In the multi-terminal flexible DC transmission system, the stability of the DC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J13/00
CPCH02H7/26Y02E60/00Y04S10/20
Inventor 贺之渊林志光王华锋吴文祥杨建伟郑林刘盼盼
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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