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Cause Analysis of Distance on Rural Power Network Voltage Based on Power Flow Model

In order to analyze the influence of long-distance power transmission on the terminal voltage of agricultural network, this paper establishes the low voltage model of agricultural network based on the basic power flow model, and obtains the semi-quantitative relationship between the terminal voltage deviation and various factors by formula derivation. By introducing reference data for calculation, the influence of distance factor on the voltage reduction of the rural power grid is obtained. Under the same active and reactive power transmission conditions, the farm network voltage gradually decreases with the increase of the length of the agricultural network feeder. On the other hand, for the same feeder length, as the active power increases, the farm network voltage gradually decreases. As the reactive power increases, the voltage of the rural network gradually decreases. The trend of the rural power grid voltage with the reduction of the active power is greater than the reactive power, that is, the same percentage of the active power and the reactive power change. The active power has a more significant effect on the voltage reduction of the rural power grid. Therefore, the active, reactive and feeder lengths will have an impact on the terminal voltage of the rural network. By reducing the radiation range of the feeder, the terminal voltage of the rural network can be effectively improved. Introduction With the economic and social development in rural areas, the living standards in rural areas are getting higher and higher, and the rapid development of aquaculture, planting, machinery processing and living standards of residents has put forward higher requirements on the level of electricity consumption. In some remote areas, the rural power network is weak. In some cases, the electricity consumption of the villagers is affected, especially in the summer, high-temperature and heavy-duty devices. Some villagers’ household appliances such as household air conditioners and refrigerators, or agricultural equipment such as rice machines and pumps cannot be used normally. The low voltage problem of rural power grid has also become an important issue that restricts the construction of rural power grids and affects the quality of life of villagers. At present, the low voltage problem of rural power grid can be optimized by substation, line, and distribution voltage three-level joint adjustment technology [1], and there are better solutions to the problem, and it can also be installed by coupling capacitor reactive compensation equipment [2], Optimize the rural network structure [3], add new distribution transformers or increase capacity [4], configure distribution transformers with on-load voltage regulation function [5] and other means. Most of the research is concentrated in the qualitative analysis stage. The interpretation of the internal mechanism is not deep enough. This paper tries to explain the low voltage problem of the rural network by introducing the basic power flow model based on the previous power flow model. The follow-up discussion on the solution to the low voltage problem of rural power grid provides a theoretical basis. Rural Power Grid Voltage Model According to the basic model of the power flow, the network structure is appropriately simplified, and only the terminal agricultural network voltage is retained. The model is shown in Figure 1.