特高压直流换流阀多重阀试验方法及装置研究

发布时间：2018-03-18 23:25

本文选题：特高压直流输电　切入点：直流换流阀　出处：《中国电力科学研究院》2017年硕士论文　论文类型：学位论文

【摘要】：2015年,国家电网公司在提出全球能源互联的构想,其中的全球能源互联与“一极一道(北极与赤道附近)”中能源传输需要大容量远距离输电技术。同时国家提出的“西电东送”战略,也需要大容量远距离输电技术。特高压直流输电技术因其投资少、输送距离长、输送容量大等优点成为必然选择。换流阀作为高压直流输电系统的“心脏”,其能否长期可靠运行,是决定直流输电系统是否可靠运行的关键。在投入工程前,必须对阀开展全面的试验工作,检验其产品性能。IEC60700对阀试验作出了要求,但偏向于试验参数计算等笼统的要求,不够细致和完善。本文依托巴西美丽山Ⅰ期±800kV、准东至皖南±1100kV特高压直流输电工程试验,开展了特高压换流阀试验中电压最高的多重阀试验方法的研究工作。本文分析了换流阀在运行工况中需耐受的直流、操作、雷电等各类过电压应力,并结合IEC60700标准和换流阀招标技术规范中关于试验的规定,提炼了多重阀试验的具体要求,为试验方法研究及装置设计奠定了基础。结合电力系统电力电子实验室实际情况,分析了采用等效负载方式完成试验的可行性,并提出了首个高等效性等效负载拓扑,解决了具有时变特性饱和电抗器等效的难题。同时设计了新型试验拓扑,解决了需补能换流阀在试验过程中涉及的多应力源之间保护问题。参考国内外多个工程换流阀试验参数,完成了多重阀试验用直流、冲击试验装备及等效负载的研制。其中重点介绍了等效负载的电气与结构设计,并运用电容补偿的电压测量方法,解决了杂散参数对换流阀与等效负载串联分压的影响。最后,将本文所研究多重阀试验方法及试验设备具体实施于上述两个特高压工程中,顺利完成了两项工程的试验,验证了本文研究工作的合理性和正确性。
[Abstract]:In 2015, State Grid put forward the idea of global energy connectivity. Among them, global energy interconnection and energy transmission in "one pole (near the Arctic and the equator)" require large capacity long-distance transmission technology. At the same time, the national strategy of "power transmission from west to east" is proposed. UHVDC transmission technology is also needed because of its low investment and long transmission distance. As the heart of HVDC transmission system, whether the converter valve can operate reliably for a long time is the key to the reliable operation of HVDC system. It is necessary to carry out comprehensive test work on the valve to test its product performance. IEC 60700 has made requirements for the valve test, but it is biased towards the general requirements such as the calculation of test parameters. This paper relies on phase I 卤800kV, quasi-east Anhui 卤1100kV UHV HVDC project test, The research work on the test method of multiplex valve with the highest voltage in UHV converter valve test is carried out. In this paper, the overvoltage stresses of DC, operation, lightning and so on, which need to be tolerated in the operation condition of converter valve, are analyzed. Combined with the IEC60700 standard and the regulation of the test in the bidding technical specification of the converter valve, the specific requirements of the multi-valve test were refined, which laid the foundation for the research of the test method and the design of the device, and combined with the actual situation of the power electronic laboratory in the power system. The feasibility of using equivalent load to complete the test is analyzed, and the first high equivalence equivalent load topology is proposed, which solves the problem of equivalent saturation reactor with time-varying characteristics. At the same time, a new test topology is designed. The problem of protection between the multiple stress sources involved in the test process of the recharge converter valve is solved. With reference to the test parameters of many engineering converter valves at home and abroad, the DC for the test of the multiplex valve is completed. The development of shock test equipment and equivalent load. The electrical and structural design of equivalent load is emphatically introduced, and the effect of stray parameters on the series partial pressure of converter valve and equivalent load is solved by using the voltage measurement method of capacitance compensation. The multi-valve test method and test equipment studied in this paper are applied to the two UHV projects mentioned above, and the two projects are successfully completed, which verifies the reasonableness and correctness of the research work in this paper.
【学位授予单位】：中国电力科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1

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