Research On The Self-healing Functions Of Smart Distribution Grid And Its Benefits Evaluation Model

With the development of economics and technology, high-technology instruments are widely applied in modern society, power consumers become sensitive to power supply quality disturbance,which will cause enormous social and economic affects.By strength the self-healing function of distribution grid, the disturbance of power supply and economic loss could be decreased significantly.While,it need large investment,the evaluation of investment results includes economic,environmental and social benefits. Then, the construction and application of city self-healing distribution grid generate a lot of positive externality.Thus,it's necessary to evaluate the economic and comprehensive benefits of self-healing function of distribution grid. At present,it lacks of the research on self-healing of smart grid,short-time outage,economic loss of voltage-sag and economic benefits of self-healing function publicly.While in this paper,the study took deepend on benefits evaluation and model systematically and deep show important theory meaning and project application value.There are6passages in this paper.(1) The research on self-healing of smart grid.In this paper, it summarized the features of smart distribution grid and self-healing function,the realtionship between self-healing function and power supply disturbance was clarified.And then, it analyzed the key technology and indexes and promoted the technology framework of self-healing technology of distribution,grounding and whole electric compensation based on peer to peer communication.The technology evaluation indexes were built.(2) The economic loss estimated model of short-time outage was created, it analyzed the formation and influence mechanism of short-term outage and the essential of power quality disturbance,the harm and feature of short-term outage to power consumers are summarized. The sensitive power consmers of short-term outage were selected by method of comprehensive weight grey correlation, it referenced the estimation method of general power outage loss.Then considered questionnaire state of power consumers, the loss estimation model of short-term outage was built.(3) The economic loss estimated model of voltage sag was built.After that, it researched the probability and damage of voltage sag/dip,including tolerance region of power consumers'sensitive instruments and operation process.The uncertainty of various tolerance region was cleared.It change the times of voltage sag into the equal times of consumer power outage.By the uncertainty nature, it created the estimation method of voltage sag/dip loss by fuzzy logic reasoning.(4) Taking risk evaluation on the economic loss of power supply disturbance.During the evaluation research on economic loss of power supply disturbance, risk assessment method was uniquely used and VaR index method of power supply disturbance was brought by Kolmogorov test method.By this way, it remarked the severity and possibility of economic loss caused by power supply disturbance from risk point.(5) The comprehensive benefits evaluation model was built.And also, consider the economic feature of self-healing,it made research on the comprehensive benefits evaluation by theory of externality and comprehensive remark, the index system and evaluation model were built.The comprehensive benefits contains technology,economic,society,environment and application,it created a remark system by two sections. Meanwhile,it promoted the Life Cycle evaluation method of comprehensive benefits of self-healing distribution grid by triangular fuzzy-analysis hierarchy.(6) By the evaluation model, it toke X city for example and analyzed its comprehensive benefits from self-healing distribution grid.The results showed that the power supply disturbance estimation model could be feasible and reflect various influence completely.The VaR index of power supply disturbance risk also could express the severity and possibility of short-term outage to city life.Besides,the Life Cycle evaluation method was useful to measure the comprehensive benefits of self-healing distribution grid.lt considered the variation of comprehensive benefits during the life cycle and made an objective and comprehensive evaluation.. In a word, these estimation models and indexes could become references for decision-making and evaluation,The key feature of smart grid is good self-healing function.In this paper,it clarified the self-healing function, promoted new method of self-healing of short circuit fault and grounding fault, risk evaluation method,the economic loss estimated model of short outage and voltage sag.The comprehensive benefits evaluation indexes and model were built.These research results are meaningful to promoted the construction and healthy development of smart grid.