某背靠背换流站柔性直流换流变压器出线布置方案比较与选择

Comparison and Selection of Layout Scheme for Flexible HVDC Transformer in A Back-to-back Converter Station

摘要:

换流站站址周围有居民小区，人口密度较大，需要减少换流站对周边环境的影响。柔性直流变压器作为换流站的噪声源和主要设备之一，如何布置、采用何种出线方式是研究的关键问题。基于已投运换流站的典型出线及布置方案并结合某工程的具体布置要求，给出了柔性直流变压器采用油气套管、空气套管及出线方向不同组合等6种出线方案，并分析了每种出线方案的优缺点。从试验与备用相更换的便利性、出线结构的成熟性、站内布置空间可行性以及对网侧进线方式的限制性等对不同出线方案进行比较后，建议该工程采用阀网长轴同侧出线结构，即柔性直流变压器采用阀侧、网侧均为空气套管且同一方向侧出的布置方案。该方案试验和运维便利性好，节约站内布置尺寸，可适应不同网侧进线方式。

Abstract:

There are residential areas around the converter station, and the population density is relatively large. In order to promote the smooth implementation of the project and reduce the impact of converter station on the surrounding environment, as one of the noise sources and main equipmentof converter station, how to layout and what kind of outlet method for flexible HVDC transformers are the key issues to be studied. Based on the typical outlet and layout scheme of converter station in operation, and combined with the specific layout requirements of converter station, six outlet schemes of flexible HVDC transformer using oil-gas bushing or air bushing, and different combinations of outlet direction are given, and the advantages and disadvantages of each outlet scheme are analyzed. Different outlet schemes are compared from the convenience of test and replacement of standby phase, the maturity of outlet structure, the feasibility of space arrangement in the station, and the restriction of outlet method etc. It is suggested that the outlet structure with the same side of the long axis is adopted for the converter station, that is, transformer adopts the arrangement scheme that both the valve side and the grid side are air bushing and the same direction is out of the side, which is convenient for testing, operation and maintenance, saves the layout size in the station, and can adapt to the different grid side into the line.