APPLICATION OF UNIVERSAL INSTANTANEOUS POWER THEORY TO UNBALANCED LOAD COMPENSATION
WANG Mao-hai , SUN Yuan-zhang (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)
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.
【CateGory Index】： TM714