并聯(lián)多端直流輸電金屬回線站內(nèi)接地故障隔離策略研究
李廣宇1,甘宗躍2,楊建明1,彭茂蘭2
(1 南京南瑞繼保電氣有限公司,江蘇 南京 211102;2 中國(guó)南方電網(wǎng)超高壓輸電公司,廣東 廣州 510670)
摘 要:結(jié)合烏東德并聯(lián)三端特高壓直流輸電工程實(shí)例,分析了針對(duì)金屬回線站內(nèi)接地故障所配置的極保護(hù)邏輯,基于這些保護(hù)邏輯,研究了并聯(lián)多端直流系統(tǒng)在發(fā)生金屬回線站內(nèi)接地故障后,在兩端、三端運(yùn)行方式下,針對(duì)不同換流站所需要采用的故障隔離策略,并據(jù)此提出了N端運(yùn)行方式的故障隔離策略。通過(guò)仿真試驗(yàn)測(cè)試,該策略在正確隔離故障的同時(shí),可以最大程度地減少停運(yùn)換流站的數(shù)量,從而保持系統(tǒng)盡可能多的功率傳輸。
關(guān)鍵詞:并聯(lián)多端直流輸電;金屬回線;極保護(hù);故障隔離策略
中圖分類(lèi)號(hào):TM773 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2021)02-0034-06
Research on Station Grounding Fault Isolation Strategy in Metallic Return
Mode of Parallel Multi-Terminal HVDC Transmission
LI Guang-yu1, GAN Zong-yue2, YANG Jian-ming1, PENG Mao-lan2
(1 NR Electric Co., Ltd, Nanjing 211102, China;
2 China Southern Power Grid EHV Power Transmission Company, Guangzhou 510670, China)
Abstract: Based on the Wudongde parallel three-terminal UHVDC transmission project, this paper analyzes the pole protection logic for station grounding fault in metallic return. Based on these protection logics, the fault isolation strategy for parallel multi-terminal DC system in two-terminal or three-terminal operation mode is analyzed after station grounding fault occurs in metallic return, and the fault isolation strategy for N-terminal operation mode is proposed accordingly.Through the simulation test, this strategy can minimize the number of stopped stations while correctly isolating faults, so as to maintain the system power transmission as much as possible.
Key words: parallel multi-terminal HVDC transmission; metallic return; pole protection; fault isolation strategy
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