Research On Ancillary Services Trading System And Cost Allocation Under Renewable Energy Access

China's electricity market reform is progressing in an orderly manner.The construction of ancillary service market should not only consider the actual power system,but also conform to the direction of spot market construction.The power system of our country has its own characteristics in market construction,resource endowment and power grid structure,which increases the difficulty of ancillary service markets construction.At the same time,the large-scale access of renewable energy leads to an increase in the demand for ancillary services in power system,which greatly increases the cost of ancillary services.However,at present,the Cost-Sharing Mechanism of ancillary services in China is not perfect enough,which makes it difficult to guarantee market fairness.Therefore,it is of great significance to study the transaction system of ancillary service market and appropriate cost allocation methods in order to promote the construction of China's electricity market.This paper summarizes the experience of foreign advanced ancillary service market construction and the achievements of China's ancillary service market construction,and provides a basis for the establishment of ancillary service market trading system.According to the actual situation of China's power grid and the construction of spot market,this paper probes into the trading system of ancillary service market in China,puts forward the strategies of two-step construction of initial ancillary service market and perfection of ancillary service,and emphatically analyses the trading system of initial auxiliary service market.This paper puts forward a scheduling mode with paid peak-load regulation.Considering the cost of deep peak-load regulation and the cost of starting and stopping peak-load regulation in the electricity market,it can realize the effective transition from the current ancillary service management method to the spot market.Aiming at the problem of increasing ancillary service cost and unfair allocation of ancillary service cost caused by large-scale access of renewable energy,this paper introduces the concept of active peak-load regulation capability to distinguish the peak-load regulation characteristics of volatile generation from conventional generation.Based on the reference scenario of renewable energy mean output,a new method of peak-load regulation cost allocation is proposed.The simulation results show that the renewable energy will greatly increase the peak-load regulation cost of conventional units.This method can effectively quantify the increment of peak-load regulation cost caused by the fluctuation of new energy.By analogizing the conditional risk value,a conditional risk reserve model is established.Based on this,a new cost allocation method for spanning reserve is proposed.The model considers the influence of extreme skewness of probability distribution of risk factors,effectively measures the impact of risk factors on system adequacy,and allocates the cost of spanning reserve to wind farm,photovoltaic power station,load side and conventional power plant.This paper studies the transaction system of ancillary service market and the methods of peak-load regulation and spinning reserve cost allocation under the background of power market reform and large-scale renewable energy access in China.The new dispatching model and cost allocation method can be used for reference.