Matching And Optimization Of Grid Friendly Air-conditioning And Rural Typical Micro-grid System Capacity

Since the twenty-first Century,the construction of the new countryside has made the demand for energy increasing,which has brought great pressure to the energy supply.At the same time,as the pressure of the resources and environment is increasing,energy saving and emission reduction,clean energy and sustainable development have become our goal.Therefore,in order to ensure the power quality,the demand of distribution network can be met by accepting various types of power generation mode and encouraging friendly electric equipment to participate in the regulation and control.In this paper,the application of the power grid friendly power generation equipment and the power grid friendly power equipment in the rural distribution network are analyzed.Theoretically,the influence of distributed PV access on distribution network is analyzed.By building PV,rural load and distribution network simulation model,the impact of distributed PV access is analyzed.In order to improve the utilization of PV,at the same time,taking into account the characteristics of the rural distribution network,the layered energy storage is introduced,and its superiority is analyzed by simulation.On the user side,an improved response strategy is put forward for the grid friendly air conditioning load,so that the air conditioner can better participate in the power grid regulation and control,and help the grid operate stably.The main contents of this paper are as follows:(1)The influence of location and capacity of distributed PV on voltage distribution,voltage loss,network loss and reliability of distribution network is analyzed theoretically,and the corresponding influence rule is summarized.Four typical loads and PV distribution are set up,and the optimal access location and capacity of distributed PV are analyzed to ensure that the distribution network can admit more PV.(2)According to the living habits of the residents,the rural load is divided into three categories:the uncontrollable load,the transferable load and the interruptible load.The mathematical models of different types of loads are built respectively,and their output characteristics are obtained,providing a basis for whether they can be used as power grid friendly equipment.Then the mathematical model of the distributed photovoltaic is built and the output characteristics are analyzed.Power supply characteristics of low-voltage distribution network is analyzed by simulation and analysis of distributed photovoltaic and power load correlation is proposed to improve the power grid peak abundance distributed photovoltaic,so that users can better improve the photovoltaic power consumption,stable operation of the distribution network.In order to improve the power grid’s ability to accept distributed PV,layered energy storage is introduced,and four typical application scenarios are listed.In the rural distribution network,we choose the operation mode of distributed energy storage and distributed photovoltaic operation and centralized energy storage to improve the overall load characteristics of distribution network,and analyze the superiority of its application through simulation.(3)The power grid friendly power technology is mainly to manage the users side to improve the power supply reliability and operation stability of the distribution network.This paper takes the grid friendly air conditioning load as an example to analyze.First,the air conditioning load model is built in Matlab to verify the validity and correctness of the model.Meanwhile,based on the simple distribution network model,the conventional voltage response strategy is verified.Secondly,aiming at the problem of response strategies are applied to the rural distribution network,puts forward improvement strategies,namely air conditioning according to the real-time state of power grid operation,automatically adjust the operating conditions of its own,and comfort without affecting the user,helping to maintain the security and stability of power grid operation,to achieve flexible and friendly interaction between the user and the grid the.Finally,based on the voltage transient probability model and the cost model of voltage sags based on user satisfaction,the improved air conditioning response control strategy is evaluated economically.