馈线无功补偿分布不均会造成大量无功在线路上流动,导致电压越限、有功损耗严重,而目前的无功优化往往需要全面建模且无法适应拓扑变化。针对此现状,基于10 k V配电线路的有功损耗和电压降落机理,提出一种新型的配电网低压电容器协同控...馈线无功补偿分布不均会造成大量无功在线路上流动,导致电压越限、有功损耗严重,而目前的无功优化往往需要全面建模且无法适应拓扑变化。针对此现状,基于10 k V配电线路的有功损耗和电压降落机理,提出一种新型的配电网低压电容器协同控制方法——修正功率因数评估法。该方法通过馈线的修正功率因数来评估线路的无功平衡情况,以修正功率因数到平衡区间的数值距离的最小值为目标函数,并基于负反馈调节的机理采用定向寻优的方式对低压电容器进行协同控制,使修正功率因数维持在平衡区间范围内。以某实际配电线路为例,采用某一运行日全天的负荷数据进行连续潮流仿真,结果验证了所提方法的有效性,并表明修正功率因数评估法在节能降损、提高电压合格率和避免无功补偿设备频繁投切等方面具有优越性。展开更多
Based on a neutral point diode clamped eight-switch configuration, a general mathematical model of single phase bi-directional three-level (TL) rectifiers is built by proposing two equivalent TL arms for topology deri...Based on a neutral point diode clamped eight-switch configuration, a general mathematical model of single phase bi-directional three-level (TL) rectifiers is built by proposing two equivalent TL arms for topology derivation. A series of TL rectifiers are derived by using double TL and multi TL methods, and their characteristics are compared at the same time. A novel seven-switch double TL rectifier is constructed, and its operational principle and control algorithm are illustrated as well. Lastly, its waveform and harmonic spectrum are compared to those of multi TL rectifiers, and the adopted rectifier gains better performance and unit PF.展开更多
文摘馈线无功补偿分布不均会造成大量无功在线路上流动,导致电压越限、有功损耗严重,而目前的无功优化往往需要全面建模且无法适应拓扑变化。针对此现状,基于10 k V配电线路的有功损耗和电压降落机理,提出一种新型的配电网低压电容器协同控制方法——修正功率因数评估法。该方法通过馈线的修正功率因数来评估线路的无功平衡情况,以修正功率因数到平衡区间的数值距离的最小值为目标函数,并基于负反馈调节的机理采用定向寻优的方式对低压电容器进行协同控制,使修正功率因数维持在平衡区间范围内。以某实际配电线路为例,采用某一运行日全天的负荷数据进行连续潮流仿真,结果验证了所提方法的有效性,并表明修正功率因数评估法在节能降损、提高电压合格率和避免无功补偿设备频繁投切等方面具有优越性。
基金National Nature Science Foundation of China(50277017)
文摘Based on a neutral point diode clamped eight-switch configuration, a general mathematical model of single phase bi-directional three-level (TL) rectifiers is built by proposing two equivalent TL arms for topology derivation. A series of TL rectifiers are derived by using double TL and multi TL methods, and their characteristics are compared at the same time. A novel seven-switch double TL rectifier is constructed, and its operational principle and control algorithm are illustrated as well. Lastly, its waveform and harmonic spectrum are compared to those of multi TL rectifiers, and the adopted rectifier gains better performance and unit PF.
