Research Of Microgrid Reliability Evaluation Model Considering Optimal Operation

Influenced by the demand of energy and environmental crisis,people put more attention on the use of renewable energy or clean energy of the distributed power supply technology,the microgrid can effectively integrate all kinds of distributed power generation,alleviating the negative impact of distributed power generation connected with grid,improving power supply reliability of the local users,but the output intermittent of distributed power used renewable energy and microgrid optimization strategy can bring new influence to microgrid reliability evaluation,paper achieved the following results around the related problems in the process of microgrid reliability evaluation mainly:The paper established reliability model of distributed power generation,energy storage device,classifing load types within microgrid according to the priority order of power supply,establishing the related load type model.According to the Uncertainty of protective devices action probability in microgrid under different scenarios,the model of protective devices action probability was establish,the failure rate function of distributed power,energy storage,lines was also built in this paper on the basis of that model.Meanwhile,analyzing the different wiring microgrid reliability consider the influence of wiring on protective devices.Further,a scene change microgrid reliability assessment method was proposed based on enumeration method and the shortest method.Finally,the simulation put a low voltage microgrid in Guangxi as a practical example,using the component failure rate model proposed in this paper,evaluating the reliability of microgrid whether to consider the uncertainty of protective devices Action probability,and analyzes the results.This paper considers islanded-microgrid constraints in each operate period,proposing a new microgrid optimal operation model.The target of problems is the minimum of microgrid operation cost,considering microgrid operate constraint under connected mode and islanded mode at the same time.First the problems is decomposed into main problems which cost least and the sub-problem which has the least unbalanced power under islanded mode using the Benders decomposed method.Then associate sub-problem problems with the main problems by Benders cuts,besides,this paper proposed T-? criterion under islanded mode,developing under the different operating principles,the adjustment mechanism of microgrid schedulable distributed power generation,energy storage device and load.Finally,the paper proposed the micro grid reliability evaluation method combined with the islanded microgrid optimal operation model.Firstly,for gauge the uncertainty of component failure rate,this model sample state of component using double monte carlo method.Then,this model researches micogrid reliability in sequential monte carlo sampling period based on the scheduling plan.Finally,through the case analysis,the study researches the influence of optimization strategy on micro grid reliability evaluation result quantitative.