Research On Power Quality And Line Loss Control Method Of Power Electronics High Penetrated Distribution Networks

Power electronic devices,which contain power electronic devices for electricity consumption and distributed generation devices for the consumption of renewable energy,are continuously applied in human life with development of science and technology.The increasing penetration of power electronic devices has led to an increasing level of power quality disturbance emission in distribution networks.However,the demand for power quality in modern electricity supply is getting higher.Also,the requirements for line loss in distribution networks are getting stricter with the unveiling of carbon peaking and carbon neutrality goals.Therefore,this paper focuses on the problems of power quality and line loss in power electronics high penetrated distribution networks,including the algorithm of power quality disturbance signal analysis,the characteristics of power electronics high penetrated distribution networks based on deterministic model,the characteristics of power electronics high penetrated distribution networks based on probabilistic model,and the regulation of line loss by distributed generation.The details are as follows.（1）The power quality disturbance signal evaluation algorithm is studied for the power quality disturbance problem brought by the deepening use of power electronics in distribution networks.First,mathematical models of the power quality disturbance signals and a dictionary for the atomic decomposition algorithm are established.In addition,an improved convolutional neural network-based atomic decomposition algorithm inspired by power quality disturbance signals classification detection algorithms is proposed.Finally,the computational efficiency and the correctness of subdictionary selection superiority of the proposed algorithm are testified by a case study.（2）The deterministic evaluation model of power electronics high penetrated distribution networks is investigated.Since harmonics are the main problem of power electronics high penetrated distribution networks,this paper first establishes a harmonic power flow model.Based on the harmonic power flow model of the distribution networks,the impact of the harmonic loads and distributed generations on the distribution networks is analyzed.The neglected harmonic factors in the conventional power flow calculation are modeled and analyzed by establishing the harmonic power flow model of power electronics high penetrated distribution networks.（3）The impact of uncertainty of power electronic loads and distributed generations on the distribution network is studied with the established deterministic model.Firstly,probabilistic models of loads and distributed generations are established.In addition,Monte Carlo Simulation and Point Estimation Method are used to solve the probabilistic model,and the results are compared and analyzed.The evaluation of the probabilistic model can provide more effective information for the distribution network planning.（4）The line loss regulation strategy for the optimal access of distributed generations is studied.A deterministic optimization model and an uncertainty optimization model restricted by voltage deviation level and harmonic level are established respectively.Genetic algorithm is used to find the optimal access nodes and access capacity of distributed generations.Moreover,the performance of different access solutions based on different models is analyzed and compared to explore a better line loss control strategy.