Study On Power Flow Algorithm Of Gird-connected Photovoltaic System Based On The Generalized Tellegen’s Theorem

With the development and utilization of solar power, photovoltaic generation and itsgrid-connected technology is paid more attention, because of the randomness andintermittence of photovoltaic power generation, resulting in new problems has appearancewith power flow calculation of photovoltaic grid-connected, so the power flow algorithm ofphotovoltaic grid-connected system was research.Based on the basic frame structure of photovoltaic generation grid-connected system,considering the physical connection and electrical relationship between various models, byusing of universality mathematical modeling method in control theory, this thesis establishedthe comprehensive model of photovoltaic grid-connected system. By combination of the builtmodel with traditional power network model, this thesis established the power flowmathematic model of steady which includes photovoltaic source. The nodes treatment forpower flow calculation, the independent photovoltaic grid-connected system as the PQ nod, inthis paper, the comprehensive model of independent photovoltaic grid-connected systemfurther equivalent, in this paper, the comprehensive model of independent photovoltaicgrid-connected system further equivalent, which formed passive network and photovoltaicsource, passive network incorporate into main network. On this basis, the thesis presented amethod of power flow calculation based on the Generalized Tellegen’s theorem. The methodcan effectively combining network topology, network parameters with power parameters tomake a modified equation based on generalized Tellegen’s theorem by using the samenetwork under different time formed mutually adjoint network, and the specific steps ofphotovoltaic grid-connected system power flow calculation were given.By the IEEE30nodes system testing, the power flow calculation of photovoltaicgrid-connected system based on the Generalized Tellegen’s theorem is effective and accurate.