Loss Assessment of Key Equipment on Lcc-Based HVDC Converter Stations

Abstract

In distribution and transmission, particularly when the power is transported over a transmission line of distance 500km and above, a considerable amount of power is lost during power systems operation, which consist of all the components that are used in generation, transmission and distribution of power. Therefore, it is imperative to estimate the power loss due to some power equipment on the electrical network during transmission and distribution systems. The overall power consumption in transmission of bulk electric power is reasonably reduced by the power loss. The loss calculation of converter station is the difficulty of HVDC system loss calculation. The transmission power is growing with the increase of HVDC transmission voltage. It is important to study and critically analyze the losses including HVDC system to actually improve the economics of HVDC system. It is the purpose of this research work to explicitly discuss the procedures for verifying, determining and calculating the overall losses of various equipment of LCC-based high-voltage direct current (HVDC) converter station under operating and standby mode using datasheet parameters (Phase Control Thyristor Type DCR3030V42), since loss calculations are most times based on datasheet values and experimental measurements. The loss calculations in this research work are precisely applicable to all parts of the converter station and cover standby, partial-load, and full-load losses and methods of calculation. According to IEC 61803 of Determination of power losses in high-voltage direct current (HVDC) converter stations, the loss calculation models of converter station equipment under operation and standby mode are elaborately established.