青藏直流输电工程系统试验研究

发布时间：2018-07-15 10:02

【摘要】：对世界上海拔最高的青藏直流输电工程系统试验内容进行了研究分析,包括系统试验方案编制,直流系统解锁/闭锁方式,以及安全稳定措施等。提出了青藏直流系统试验期间的开机方式;对直流单极和双极降压起停方式进行了分析,通过研究提出了本阶段系统试验直流输送功率水平,并进行了试验验证。针对藏中电网"大直流、小电网和弱受端"电网系统的频率和电压稳定问题进行了分析,编制了系统试验方案和现场试验实施计划,对每项试验都落实了安全措施。对现场系统试验进行了分析,结果满足工程技术规范要求。对无站间通信极间功率转带控制策略进行了分析,提出了在站间通信故障后,立即将直流功率降至受端(拉萨侧)用电负荷的百分之八以下。系统试验期间发现的问题解决保证了青藏直流输电工程系统调试的顺利进行和按期投入试运行。
[Abstract]:The test contents of the Qinghai-Tibet HVDC transmission system with the highest elevation in the world are studied and analyzed, including the system test scheme, the way of the DC system unlocking / locking, as well as the safety and stability measures, etc. The start-up mode of Qinghai-Tibet DC system during the test period is put forward, and the starting and stopping modes of DC unipole and bipolar step-down are analyzed, and the DC transmission power level of the system test at this stage is proposed and verified by test. In this paper, the frequency and voltage stability of "large DC, small and weak receiving" power system in Zangzhong power grid is analyzed. The system test scheme and field test implementation plan are worked out, and safety measures are implemented for each test. Field system tests are analyzed and the results meet the requirements of engineering specifications. This paper analyzes the control strategy of inter-pole power transfer in non-station communication, and proposes to reduce the DC power to less than 8% of the power load of the receiving end (Lhasa side) immediately after the inter-station communication failure. The solution of the problems found during the system test ensures the smooth commissioning and commissioning of the Qinghai-Tibet HVDC transmission system.
【作者单位】：中国电力科学研究院;
【分类号】：TM721.1

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