AC-DC Distribution Grid Reliability Analysis With PV Power

With the rising of electric energy in end-user energy consumption proportion, the position of distribution network power supply’s reliability becomes more important in the power system. The reliability of power supply has a direct impact on social production and life which can be or not normal and orderly going on. Especially with the wide application of distributed energy and the rise of DC power distribution mode, it changes the traditional distribution way, which leaded to defeat previous reliability analysis method. Therefore,it needs an effective and feasible reliability analysis method to analyze new distribution network reliability.In this context, the thesis uses sequential Monte Carlo method to study analyze the reliability of the distribution network from the type of the power supply and the way of power supply connection, the main contents are as follows:For the distributed photovoltaic powers access to the traditional distribution network by new distribution way, the paper presents a power model and reliability model of photovoltaic power. Using sequential Monte Carlo method, the paper analyses the reliability. And by the analysis sensitivity, to achieve the best access locations and capacity options for distributed photovoltaic power, providing a theoretical basis for large-scale distributed photovoltaic power reasonable access.The grounding system for the DC distribution network with bipolar operation mode structure, the paper from the reliability model of DC component, proposes the DC distribution network reliability analysis model with different the traditional AC distribution network. Analyse and compare the AC and DC distribution grid reliability as well as the DC distribution grid reliability whether or not the grounding system in the case. The results of reliability in the form of space display visually.Considing the life of components, intermittent of photovoltaic power output power, etc., the paper analyzes the factors of affecting the distribution grid reliability fluctuations. While taking advantage of the timing advantage for sequential Monte Carlo method, predicts the AC and DC distribution grid reliability trends coming years with real-time prediction reliability parameters, and analyzes the causes of trends of two different distribution ways, at last proposes a number of measures to improve the reliability of the distribution network.A numerical example verifies the correctness and feasibility of analysis methods and analytical models used in this paper.