Operation Control and Protection Strategy of Domestic 500 kV DC Cable in Flexible DC Grid

doi:10.12204/j.issn.1000-7229.2022.07.009

Abstract

Abstract:

High-voltage DC cables are important equipment for cross-sea long-distance power transmission and new energy grid integration. DC cables with high voltage levels and current capacity are still in the research and development stage.In order to promote the research and development of high-voltage DC cables and test the long-term operation performance, this paper relies on a domestic ±500 kV flexible dc grid project to establish a DC cable comprehensive test station.The DC line of the domestic ±500 kV flexible dc grid project mainly adopts the overhead transmission line scheme. The test station is located at the single-pole outlet of one of the converter stations, and the trial DC cable runs in parallel with the overhead line.The operation control and protection coordination are complex, the reliability requirements are extremely high, and there is no engineering experience to follow.In this paper, aiming at the connection mode of parallel switching operation between 500k V DC cable test section and overhead line, the DC cable monitoring and input and exit control strategy, fault protection strategy and overload operation control protection strategy in the test station are proposed for the first time, and are verified by simulation experiments, it can realize reliable operation of DC cable access to flexible DC grid.

Key words: flexible DC grid, high-voltage DC cable, localization, protection strategy, operation control

CLC Number:

TM247

ZHONG Qidi, PU Ying, SUN Jianfeng, JIANG Chongxue, LI Tan, ZHAO Peng, ZHOU Yang. Operation Control and Protection Strategy of Domestic 500 kV DC Cable in Flexible DC Grid[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(7): 80-86.

Figures/Tables 8

Fig.1 Schematic diagram of the location of test cable in the flexible DC grid

Fig.2 Schematic diagram of DC cable wiring

Fig.3 Diagram of configuration of DC cable differential protection and failure points

Table 1 Setting values of DC cable differential protection

Fig.4 Influence on the fault characteristics of F2 with or without DC cable (StationⅠside)

Fig.5 Influence on the fault characteristics of F4 with or without DC cable(midpoint of DC line)

Fig.6 Influence on the fault characteristics of F3 with or without DC cable (StationⅡside)

Fig.7 Diagram of DC cable current carrying control

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