Automatic load distribution method for intelligent transformer substation

Abstract

The invention relates to an automatic load distribution method for an intelligent transformer substation. The automatic load distribution method includes performing load flow calculation of the whole network according to network and load data acquired currently by the intelligent transformer substation of a power distribution network; by a reactive power optimization module, on given constraint conditions, solving the optimal solution of an objective function by a search algorithm to obtain schemes on in and out of a reactive power compensation device and transformer tap adjustment; by a power distribution network reconstruction module, on given constraint conditions, solving the optimal solution of the objective function by a virtual stream algorithm to obtain schemes on combined operation of states of network section switches and communication switches; by an interactive computation module, interacting the two sub problems including reactive power optimization and power distribution network reconstruction to approach the optimal solution gradually so as to realize automatic load distribution with the purpose of minimizing power loss. By the automatic load distribution method, power loss of lines is reduced, running of a power grid is optimized effectively, network loss is reduced, analysis speed of the power grid and control reliability are improved, and safety, reliability and economization in running of the power grid is guaranteed. In addition, the automatic load distribution method can be applied to automatic load distribution process of the intelligent transformer substations widely.

Description

technical field [0001] The invention relates to a load distribution method of an electric power system, in particular to a load automatic distribution method of an intelligent substation. Background technique [0002] Automatic load distribution is based on the premise that the voltage of each node of the system is qualified, and the ultimate goal is to minimize the network loss. The existing technology uses reactive power optimization and network reconfiguration technology to reduce the power loss of the distribution network. The power optimization and network reconfiguration technologies are described in detail respectively: [0003] 1. The reactive power optimization technology adopts the input of reactive power compensation device, the adjustment of the tap of the on-load tap changer, and the adjustment of the terminal voltage of the generator to achieve the purpose of reducing reactive power loss. The reactive power optimization methods mainly include: 1) non- The form...

AI Technical Summary

Problems solved by technology

The reactive power optimization of the linear programming method has the following important defects: the actual optimization model of the system is linearly approximated, and the discrete variables are continuously processed, so that the calculation results are often different from the actual situation of the power system. In the process, if the step size is too large, it may cause oscillation, and if the step size is too small, it is easy to slow down the convergence

However, the guiding ideology of opening the switch with the smallest current in the optimal flow mode lacks theoretical basis. The various circulating currents in the ring network affect each other. The results also have a greater impact, and the error in network loss estimation will affect the accuracy of switching operations

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