Research On Theory And Implementation Mechanism Of Interruptible Load

In face of the increasingly severe issue of global power shortage,the importance of demand side resources is even more obvious.Interruptible load,as a kind of virtual reserve generation capacity as well as transmission capacity,has received great concern in terms of peak load shifting,grid congestion reduction and renewable energy restraining due to its flexibility and rapidity in demand response.The effectiveness of interruptible load response is subjected to the constraints of bilateral contracts and participating motivation of subscribed customers.As a result,this paper aims to dig deeper into the interruptible potential of electrical customers and conduct research on theory and implementation mechanism of interruptible load.Therefore,the greater participating motivation as well as elasticity of demand side can be achieved by formulating reasonable incentive mechanism and reward/punishment rules.The main research findings are summarized as follows:Firstly,an evaluation method on interruptible potentials and values of large industrial customers is proposed.Customer's response behavior is described through load curtailing capacity and reduction uncertainty.The interruptible attributes of customers are extracted by investigating customer characteristics.Then an interruptible index system is established from three aspects: customer's basic situation,ability of interruption and aspiration of interruption.The objective weight and subjective weight of each index are calculated by the entropy method and the analytic hierarchy process method.After that,a comprehensive evaluation model is put forward to realize the quantitative evaluation of customer's interruptible value.Finally,the interruptible values of 7 industrial large customers in a certain area are calculated,which verified the effectiveness of the proposed method.Secondly,an interruptible load scheme based on deposit mechanism is proposed.The theory of deposit mechanism of interruptible load is put forward based on the idea of bank savings.Considering the real-time characteristics of electric power supply and consumption,a deposit point method is introduced to realize the saving,appreciating and trading function through the conversion between actual load reduction and deposit points.The operation mode as well as implementation process of deposit mechanism is summarized.In addition,the contract contents and reward/punishment rules under deposit mechanism are designed based on the previously mentioned theory.Finally,individual benefits as well as overall benefits of three typical customers under deposit mechanism and traditional mechanism are compared to verify the effectiveness of proposed deposit mechanism.Finally,a novel decision strategy of interruptible events considering uncertainty of customer behavior under deposit mechanism is proposed.Based on the theory of deposit mechanism,a decision model with the purpose of maximizing total benefits of the power company is established.Taking into consideration of both the benefits of subscribed customers as well as the power company,a decision process of interruptible event considering uncertainty of customer behavior is also proposed.A sparse grid collocation method with Clenshaw-Curtis quadrature is put forward to deal with uncertainties of customer response in decision process.Then the analysis of decision benefits under different scenarios is carried out.Simulation results indicate that deposit mechanism can achieve greater benefits under the same incentive level compared with traditional mechanism.The effectiveness of proposed uncertainty quantification method is also verified.