| In some remote islands and other areas of our country,without large-scale power supply system,it is impossible to use the traditional distribution network for normal power supply.Micro grid can be used to supply power to remote areas,and its stable power supply capacity also determines whether it can meet the normal needs of users.Therefore,the research on reliability assessment of micro grid power supply is of great benefit to the future development of remote areas in China.Microgrid usually contains many types of generating units to cope with the change of environment.Among them,wind power and photovoltaic power generation units belong to clean energy,with the characteristics of randomness and intermittence,which will bring challenges to improve the power supply stability of microgrid,change the previous simple operation mode,and increase the difficulty of reliability evaluation.Therefore,the existing distribution evaluation system is difficult to adapt to the new grid environment accurately,and the reliability evaluation method of hybrid system also needs to be improved.In this paper,the reliability evaluation of WP,PS,DG,BS hybrid system based on is studied.Firstly,the WP,PS,DG,BS hybrid system model and the system device model of each generating unit are established.The parameters of each system are calculated by state space method,and the different control strategies of the hybrid system are explored.Secondly,the Monte Carlo simulation method and well being theory are introduced,and the reliability of a specific example is evaluated.The results show that the sequential Monte Carlo simulation method is effective.The reliability evaluation index of the existing power grid is one-sided for the hybrid system.If the two system indexes are combined and transformed into a new evaluation system,the WP,PS,DG,BS hybrid system can be evaluated more comprehensively Reliability of hybrid system.Thirdly,a hybrid system component failure rate model considering component life and weather effects and a hybrid system repair time model considering weather effects and repair impact factors are constructed;the control mode of the isolated WP,PS,DG,BS hybrid system is studied;the priority of load reduction is considered;the operation impact of fault components on the whole system is explored;based on sequential Monte Carlo In this paper,the reliability evaluation method of WP,PS,DG,BS hybrid system under the condition of islanding operation is studied through a specific example.The algorithm proves that different control modes have different effects on the reliability of the hybrid system of islanding.Finally,the operation characteristics of WP,PS,DG,BS hybrid system are analyzed,and the reasons and effects of different kinds of load outage are analyzed by using the reliability model of the upper distribution network;the relationship between different control modes and reliability is compared;the reliability evaluation method of the hybrid island system considering various influence factors is adopted to evaluate the reliability of the hybrid system and the hybrid island system in different situations The reliability of the control mode is evaluated. |
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