通用瞬时功率理论在三相不平衡负荷补偿中的应用

该文运用通用瞬时功率理论对三相不平衡负荷的补偿进行了详细的分析。文中从改变三角形补偿网络中的环流，可以改变补偿网络中各相的功率分布而不影响各相补偿电流的大小这一角度出发，得出了只利用无功元件就能够完全补偿三相不平衡负荷的结论，进一步证实了通用瞬时功率理论在三相间进行功率分布的优化分配这一思想的合理性；提出了利用相间存在耦合的电抗器网络对三相不平衡负荷进行补偿的方法。通过改变该补偿网络中各相的自感及三相电抗间的耦合系数，可以改变三相间的瞬时能量分布，从而使三相不平衡负荷趋于平衡。文中的算例验证了这一方法的合理性。与传统的TSC TCR的方法相比，该文所提方法具有设备简单的优点。

APPLICATION OF UNIVERSAL INSTANTANEOUS POWER THEORY TO UNBALANCED LOAD COMPENSATION

Using universal instantaneous power theory (UIPT), this paper gives a detailed analysis of reactive power compensation for three-phase unbalanced circuit. Changing the circumfluence flowing in the delata-connected compensation network, the power distribution among 3 phases can be changed, but the output current of the compensation network can be remained unchanged. From this point of view, this paper achieves a conclusion: unbalanced 3-phase load can be totally compensated by using var component. This confirmed conclusion validates UIPT's main principle: optimizing instantaneous power distribution among three phases. This paper also presents a compensation method using mutual coupled three-phase reactance network. Changing the compensation network's self-inductances and the coefficients of mutual induction, the instantaneous power distribution among 3 phases can be changed, thus unbalanced 3-phase load can be balanced. An example is given to verify the reasonability and feasibility of the new method. Comparing to the traditional TSC+TCR method, the method proposed by this paper has a merit of simpleness.