摘要
金中送端配套电源两径流式水电厂在枯水期因来水不足开机数量受限,不能满足直流安全运行的短路容量要求;机组长期低负荷运行导致发电设备和厂房基础结构出现严重安全隐患,威胁电厂和直流安全运行。依据设计要求和仿真分析短路容量不足对系统稳定性、交流过电压和低次谐振特性的影响,优化金中直流安全运行边界条件及直流输送功率设定。为保证被动跳进孤岛后系统稳定运行,提出主动闭锁直流的技术方案,即先切除换流站中的全部交流滤波器,然后紧急停运双极直流。该运行方式优化方案降低了直流送端开机要求,最低总开机台数由4台降至2台;枯水期直流送端功率设定600MW,既满足机组枯期出力送出又满足金中直流在联网和孤岛运行方式安全稳定要求,增强直流及送端机组运行方式安排灵活性。
The power supply for Jinguan-Guizhong HVDC sending-end system is provided by two run-off-river hydropower plants.In the dry season,due to insufficient water,power can not meet the requirements of short-circuit capacity for HVDC safe operation.The long-term low-load operation of power plants leads to serious safety hazards in the power plant and plant infrastructure,threatening the safe operation of the power plant and HVDC.According to the design requirements and simulation,we analyzed the effects of short-circuit capacity shortage on the system stability,AC over-voltage,and low-order resonance characteristics,and optimized the safe operating boundary conditions and HVDC transmission power setting of Jinguan-Guizhong HVDC.In order to ensure the stable operation of the system after the HVDC project jumped into island operation,we proposed a technical scheme of active blocking strategy as follows:to first cut off all the AC filters in the converter station,and then block the bipolar HVDC emergency.The optimization scheme reduces the start-up requirements of DC system power plants.The minimum total number of power plants has been reduced from 4 to 2.The power of HVDC is set to 600 MW in dry season.Therefore,not only the requirements of safe and stable operation mode of Jinguan-Guizhong HVDC in interconnection and island can be met,but also the flexibility of operation mode arrangement of HVDC and sending-end system power plants can be enhanced.
作者
黄智达
梅勇
朱林
谢惠藩
HUANG Zhida;MEI Yong;ZHU Lin;XIE Huifan(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Power Dispatching and Control Center of China Southern Power Grid,Guangzhou 510623,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第1期161-169,共9页
High Voltage Engineering
基金
中国南方电网有限责任公司科技项目(ZDKJXM20160003).
关键词
金中直流
枯期运行方式
孤岛运行
交流过电压
低次谐振
主动闭锁策略
Jinguan-Guizhong HVDC
dry season operation mode
island operation
AC overvoltage
low-order resonance
active blocking strategy
作者简介
通信作者:黄智达,1995—,男,硕士从事高压直流输电系统控制与优化的研究工作,E-mail:2311731828@qq.com
