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中文摘要：
为深入分析多馈入直流输电耦合作用机理,提出了无功潮流耦合作用分析方法。该方法通过无功潮流的变化,分析了当某子系统受到无功扰动之后,各子系统电压变化的机理。为定量分析多馈入直流输电各子系统之间的无功潮流支撑作用,提出了无功潮流支撑系数这一稳态指标,同时推导了该指标的表达式。基于无功潮流耦合作用分析方法,推导了双馈入系统中多馈入静态电压稳定性指标的表达式。该表达式揭示了无功潮流支撑系数、多馈入交互作用因子与多馈入静态电压稳定性指标之间的关系,结合表达式对无功潮流支撑系数的影响因素进行分析。最后,在PSCAD环境下的双馈入直流输电模型中进行仿真,验证了理论推导的正确性。
英文摘要：
A coupling effect analytical method based on reactive power flow is brought up to analyze the coupling effect in a multi-infeed direct current transmission system.An account is given to the mechanism of voltage dip in all subsystems when one subsystem suffers from reactive power disturbance through changes in the reactive power flow.The reactive power supporting coefficient (RPSC) is brought up as a steady-state coefficient to quantitatively analyze the reactive power supportive effect between subsystems.The expression of RPSC is also derived.Based on the above-mentioned coupling effect analytical method,the expression of multi-infeed voltage stability index (MIVSI) in the double-infeed direct current system is derived. The expression and derivation process reveal the relationship between RPSC,multi-infeed interaction factor (MIIF) and MIVSI.The influencing factor of RPSC is analyzed by referring to the expressions.Eventually,simulation in double-infeed direct current transmission system in PSCAD environment is carried out to validate the theoretical derivation.
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