The Improved Methods Of The Energy Loss Calculation Considering The Access Of Renewable Energy

As the advantage of environmental friendly and sustainable development capability,the renewable energy increases rapidly.Compared with conventional power sources,wind power,photovoltaic energy and other renewable energy sources have features of randomness,volatility,regionalism and so on.Therefore,the access to the distribution network will cause power fluctuations and other effects,thereby affecting the energy loss of the distribution network.However,the original calculation method for the energy loss does not consider the impact of the access of the renewable energy,so a larger calculation error will be caused if the original calculation method is still used.It should be mentiond that the energy loss of the power grid is one of the key factors affecting the economic operation of power systems,therefore how to calculate the electric energy consumption accurately and reduce the error as far as possible is the key task for power companies.In conclusion,studying on the improved methods of the energy loss calculation considering the access of renewable energy has very important practical significance.Taking into account the access of the renewable energy to the low voltage distribution network and the middle-high voltage distribution network is different,the improved methods of the energy loss calculation considering the access of renewable energy are studied in the low voltage distribution network and the middle-high voltage distribution network respectively.First,in the low voltage distribution network,the problem of the original calculation method is pointed out,and the improved equivalent resistance method is presented,which is considered the access of the distributed energy resource,based on the back/forward power flow calculation and the first end of three phase current.Second,in the middle-high voltage distribution network,this paper presents an improved method to calculate the energy loss considering the fluctuations of wind power generation.The data are collected to obtain the curve of the typical daily expected output of wind farms for one month,the curve of the typical daily expected output are corrected by the average electricity and the shape factor to obtain the curve of the typical daily equivalent output of wind farms for one month,and the power flow is calculated by using typical daily equivalent output curve to describe the energy loss for one month.Then,the case study results show that the improved methods are feasible.In the end,the factors influencing the energy loss of the power grid are analyzed,the probability distribution and the influence for the energy loss of the power grid of the shape factor are studied,and the strategy of energy saving and loss reduction of the power grid considering the influence of the renewable energy is presented.