Suppression effect in multiple regression analysis may be more common in research than what is currently recognized. We have reviewed several literatures of interest which treats the concept and types of suppressor va...Suppression effect in multiple regression analysis may be more common in research than what is currently recognized. We have reviewed several literatures of interest which treats the concept and types of suppressor variables. Also, we have highlighted systematic ways to identify suppression effect in multiple regressions using statistics such as: R2, sum of squares, regression weight and comparing zero-order correlations with Variance Inflation Factor (VIF) respectively. We also establish that suppression effect is a function of multicollinearity;however, a suppressor variable should only be allowed in a regression analysis if its VIF is less than five (5).展开更多
电力系统的低频振荡现象会严重影响到系统的稳定性,相应的机理分析和抑制策略一直备受国内外学者的关注。提出以储能装置和电力系统稳定器(Power System Stabilizer,PSS)为手段实现对电力系统暂态功率的调节,并最终实现抑制电力系统低...电力系统的低频振荡现象会严重影响到系统的稳定性,相应的机理分析和抑制策略一直备受国内外学者的关注。提出以储能装置和电力系统稳定器(Power System Stabilizer,PSS)为手段实现对电力系统暂态功率的调节,并最终实现抑制电力系统低频振荡的控制目标。首先给出了储能系统中逆变器的控制策略;同对简化了逆变器模型,在不造成系统级误差的前提下,使用仿真速度极快的向量解算方式进行仿真验证;最后通过短路故障产生低频振荡现象,在仅用储能装置、仅用PSS、储能装置和PSS协调控制3种不同条件下抑制低频振荡。对Matlab/Simulink仿真结果进行对比和分析,得出储能装置和PSS在抑制电力系统低频振荡时存在配合的可能性,储能装置和PSS的配合控制比单独使用储能装置或PSS的调节效果好。展开更多
文摘Suppression effect in multiple regression analysis may be more common in research than what is currently recognized. We have reviewed several literatures of interest which treats the concept and types of suppressor variables. Also, we have highlighted systematic ways to identify suppression effect in multiple regressions using statistics such as: R2, sum of squares, regression weight and comparing zero-order correlations with Variance Inflation Factor (VIF) respectively. We also establish that suppression effect is a function of multicollinearity;however, a suppressor variable should only be allowed in a regression analysis if its VIF is less than five (5).
文摘电力系统的低频振荡现象会严重影响到系统的稳定性,相应的机理分析和抑制策略一直备受国内外学者的关注。提出以储能装置和电力系统稳定器(Power System Stabilizer,PSS)为手段实现对电力系统暂态功率的调节,并最终实现抑制电力系统低频振荡的控制目标。首先给出了储能系统中逆变器的控制策略;同对简化了逆变器模型,在不造成系统级误差的前提下,使用仿真速度极快的向量解算方式进行仿真验证;最后通过短路故障产生低频振荡现象,在仅用储能装置、仅用PSS、储能装置和PSS协调控制3种不同条件下抑制低频振荡。对Matlab/Simulink仿真结果进行对比和分析,得出储能装置和PSS在抑制电力系统低频振荡时存在配合的可能性,储能装置和PSS的配合控制比单独使用储能装置或PSS的调节效果好。
