Research On Reactive Power Pricing In Electricity Market Considering Static Voltage Safety Constraints

With the gradual deepening of the market-oriented reform of my country’s power industry,the market system of the power market has become more and more abundant,and the tradable varieties of the power market have gradually increased.From the early medium and long-term electricity transactions with a small proportion to the present 8provincial spot power markets,The scale of transactions has gradually expanded and transactions have become more frequent.Due to the advancement of the energy revolution,the proportion of new energy sources such as wind and solar in the power supply structure has gradually increased,and the uncertainty has increased,which not only makes the balance of active power face challenges,but also affects the balance of reactive power and the safety and stability of grid voltage.In this case,how to use price signals to mobilize the reactive resources of all parties becomes very important.Therefore,it is necessary to carry out real-time reactive power pricing research that takes into account static voltage safety indicators,which is conducive to the security and stability of the power grid and the allocation and utilization of reactive power resources in the power market.First,the basic theory and knowledge of real-time reactive power pricing in the electricity market are sorted out,including three parts: electricity market,reactive power balance,and pricing theory.Among them,in the basic part of the electricity market,it introduces the composition of the electricity market,the competition mode and characteristics,the transaction mode and transaction types of the electricity market;then,it discusses the types of reactive power sources,reactive power loads,and reactive power that are closely related to reactive power prices.The problem of reactive power balance;then the pricing principles of the electricity market are given,and the pricing methods commonly used in the electricity market,such as the comprehensive cost method,the long-term marginal cost method,and the nodal electricity price method,are introduced,and the principles of these methods are introduced.The advantages and disadvantages are compared and analyzed.Secondly,a real-time reactive power pricing optimization model that takes into account the static voltage safety constraints is constructed,including three aspects: the design of the objective function,the discussion of constraint conditions,and the choice of solution methods.Among them,in the objective function part,different objective functions and their applicability are discussed,and the generator cost function on the power source side and the reactive power equipment cost function on the user side are analyzed.Added discussion on static safety and stability voltage constraints;when solving the optimization problem,based on the analysis of the principle of the interior point method,combined with the immune algorithm,an improved interior point method calculation process is given.Finally,a simulation analysis of real-time reactive power pricing with static safe voltage constraints is carried out,including three parts: case design,case analysis,and analysis of optimized calculation performance.Among them,in the calculation example design part,the content of the calculation example analysis is classified according to different perspectives,including when the time scale is different,when different reactive power resources are used,and when the static safety voltage constraint is used,etc.;then,IEEE-5 and The IEEE-14 two systems compare and analyze the changing laws of reactive power prices in different situations,and verify the feasibility of the reactive power pricing model in this paper.