Analysis And Study Of Distribution Network Load Model For Zao Zhuang Area

In recent years, with the continuous economic development, the electricity load of Zaozhuang is rising very fast, which leads to a scale expansion of the grid of the area. At the same time, due to a large number of new energy power generation access network, the errors of the system power flow calculation, failure analysis and a variety of stability analysis and calculation are become larger and larger. The accuracy of the power flow calculation and the convergence of the algorithm depend entirely on the similarity and accuracy of the applied load model to the actual load model of the system. At the same time, Zaozhuang region for the system static and dynamic stability check, the conservative load model calculated by the larger short-circuit current, in order to stabilize the system security will increase the investment in equipment, resulting in excessive waste of resources; using the load model calculated Small, may lead to damage to the system running equipment, and in the dynamic stability, static stability analysis also need more accurate model as a support.In this paper, the above problems are studied to establish a reasonable distribution network load model in order to support the corresponding demand. Induction motor is an important tool for the conversion of electrical energy into mechanical energy, which is common in all industries. Therefore, the proportion of the dynamic load is the largest. The first step is to research the induction motor. Based on the previous research, this paper summarizes the common load models of induction motors, and builds the corresponding simulation models in MATLAB. With the boundary conditions of different faults as input, the simulation analysis of each model is carried out, the dynamic response of the model under different conditions was analyzed, and the application of each model was summarized.On this basis, this paper, under the condition of considering dynamic load, modeled the distribution network of Zaozhuang area, and determined the corresponding parameters. The third-order model of the induction motor is used as the equivalent model of the dynamic load. The mixed model of the power function-polynomial function is equivalent to the static load of the region. The voltage drop, single-phase short circuit, As the input, the load response to the region of the simulation analysis, obtained the corresponding active and reactive response curve. Considering the rapid development of renewable energy in recent years, the proportion of distributed power supply is increasing, so this paper discusses the distribution network load model considering distributed power supply. Based on the original model, using the converter plus generator The strategy of distributed power supply is introduced into the model, and the parameter determination method of the model is discussed, which can provide reference for the following research.