Design method for maximizing the AC filter and shunt capacitor size in a classical HVDC system

摘要

In a classical UHVDC system, the switchable units (including AC filter and shunt capacitor banks) and associated equipment (e.g. switchgear etc.) occupy around 1/3 of the total converter station footprint. This is a costly part of the converter station. To reduce the cost of the converter station, one way could be increasing the size of each single switchable unit, hence reducing the total number of the switchable units. The number of associated equipment will be also reduced accordingly. Therefore, the footprint and the cost of a converter station could be reduced. In this paper, an optimal size design is proposed, which could maximize the size of a single switchable unit. Maximization can be done by using an optimal HVDC control method, or by using an optimal control method coordinated with a STATCOM installed at the converter station. The optimal design schemes for switchable units are compared with a conventional design and the results are presented in this paper.