Simplified Analysis Of Power Flow In Optimum Control Of Distribution Network

It is demonstrated in this paper that single-phase Bilateral equivalent Voltage DropModel brought forward can be used to build model not only for lone feeder, but also forfeeders in network and voltage of end nodes on feeders can be exactly calculated. Thoughsingle-phase Bilateral equivalent Line Loss Model brought forward can be applied to lonefeeder, not to feeders in network, because the calculation result is of much error. ThusBilateral equivalent Line Loss Model is actually unfeasible. single-phase simplified algorithm to power flow calculation of distribution networks isadvanced. Based on known quantity, an approach and formulae to calculate branch loss andnode voltages are presented. Three phase bilateral equivalent Voltage Drop Model for three phase power flowsimplified calculation of distribution networks is advanced, in which the influence of mutualimpedance is considered. Similarly it can be used to build model for feeders in network andvoltage of the end nodes on feeders can also be exactly calculated. Three phase simplified algorithm to power flow calculation of distribution networks ispresented. Ground on Single-phase simplified algorithm, an approach and formulae tocalculate branch loss and node three phase voltages are deduced for three phase simplifiedalgorithm. Being the power flow analysis without simplification in this paper, forward andbackward propagation is adopted to calculate branch currents and node voltages for radialdistribution network. This algorithm has many merits, such as: program simple, convergencebetter, high efficiency of calculation, quickly speed of iteration and save EMS memory and soon. Applications for Single-phase,three phase simplified algorithm and the power flowanalysis without simplification are designed. These methods have been tested to manydistribution networks, and the results show that the proposed simplified algorithms are muchaccurate and simple. With the proposed simplified algorithms, the number of nodes in the iteration can begreatly reduced; the voltages at each load position and the loss of the whole distributionnetwork are calculated without iteration. When the proposed simplified algorithms are appliedto seriate power flow calculations in network reconfiguration, distribution network can bebuilt model once time. As a result, the simplify effect is more obvious. It is shown that theproposed method is adapted to being module of power flow calculation in adopting randomalgorithm such as genie algorithm and simulated annealing algorithm to plan and optimizedistribution network.