针对过往多馈入直流(multi-infeed line commutated converter based high voltage direct current,MIDC)系统强度指标不能准确反映静态电压稳定的问题,该文研究计及MIDC系统静态电压稳定的强度指标定义方法。首先,在推导MIDC系统潮流分析模型的基础上,定义基于多馈入交互作用因子的等值耦合导纳的概念,等值耦合导纳可定量反映MIDC系统中其余直流子系统对被研究直流子系统的影响;并建立基于等值耦合导纳的MIDC系统单端口等值模型。其次,基于建立的MIDC系统单端口等值模型,提出一种能够准确衡量MIDC系统静态电压稳定的多馈入综合短路比(multi-infeed integrated short circuit ratio,MISCR)强度指标。最后,在不同直流功率增长场景和控制方式组合下的算例分析结果表明,所提MISCR指标比过往强度指标更能准确地衡量MIDC系统的静态电压稳定性。
【英文摘要】
Facing the issue that earlier strength indices for multi-infeed LCC-HVDC(MIDC) systems fail to indicate static voltage stability accurately, the definition method of the strength index for the MIDC system was studied based on the static voltage stability. Firstly, an equivalent coupled admittance concept was defined based on the multi-infeed interaction factor(MIIF) index, which can be used to quantify the effect of other LCC-HVDC links on the studied LCC-HVDC Link. Then, a single-port equivalent model of t...
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