VSC的FACTS元件对动态电能质量的影响

鉴于目前研究的FACTS装置很大一部分运用到VSC这一事实,介绍了基于VSC的UPFC,HVDC和SMES的原理和工作过程,利用PSCAD/EMTDC软件包分别建立了它们的时域模型;从动态电能质量的角度出发,分析在系统稳态、遭受两相短路故障、输电线路雷击和系统含谐波源情况下,基于VSC的UPFC,HVDC和SMES装置对动态电能质量的影响。将其结果与未安装这些FACTS装置下的波形进行比较,结果表明,采用基于VSC的UPFC,HVDC和SMES技术将使系统动态电能质量得到改善。

Study on impacts of VSC-based HVDC upon dynamic power quality

FACTS technique (Flexible Alternating Current Transmission Systems technique) is forecasted as one of the main support techniques in the future. FACTS are capable of regulating line voltage, controlling line load-flow, damping system oscillation and improving transient stability. Based on the fact mat a majority of FACTS controllers utilize bom shunt-connected and series-connected Voltage-Sourced Converters (VSC), the theory and operation process of UPFC, VSC-HVDC and VSC-SMES are briefly reviewed. The time-domain models with UPFC, VSC-HVDC and VSC-SMES are designed by using PSCAD /EMTDC software package. From the dynamic power quality point of view, the effects of VSC-based FACTS on the systems under steady-state and the one under the situations when a fault happened, a line was stricken by a lightning, and a harmonic source was added into the system, are discussed. In comparison with the results of systems without any FACTS controller under the same situations, VSC-based FACTS will improve the power system dynamic power quality.