Power Purchase Optimization Decision Of Electricity Sales Companies Under Renewable Portfolio Standard

Under the new round of electricity system reform and renewable portfolio standard,electricity sales companies,as the new market entity,undertake the obligation of the minimum consumption weight of renewable energy corresponding to their electricity sales,and need to purchase the corresponding power products in the renewable energy market,excess consumption market and green certificate market in order to fulfill the the responsibility of consumption.Under the new electricity market environment,electricity sales companies need to balance different power purchase risks and costs in each markets during the decision-making process of power purchase,and rationally distribute the power purchase in each market under certain load demand of power users and the lowest consumption weight of renewable energy,so as to maximize their comprehensive benefits and promote long-term development.On the basis of consulting a large number of related literatures,this paper firstly analyzes domestic and foreign research developments on renewable portfolio standard,risk management and power purchasing strategies of electricity sales companies.By comparing the development courses of renewable portfolio standard in typical foreign countries,this paper summarizes the enlightenment of foreign renewable portfolio standard,combined with the current situation of renewable energy development in China,it analyzes domestic necessity of implementing renewable portfolio standard,and explores the implementation plan of renewable portfolio standard in China.Secondly,in combination with the new electricity market environment,this paper establishes a new type of electricity market system including conventional energy trading market,renewable energy trading market,excess consumption trading market,and green certificate trading market,it puts forward a electricity market structure under renewable portfolio standard,and analyzes the dynamic equilibrium of electricity trading market.At the same time,it sorts out the risk factors that affect the electricity purchase price of electricity sales companies under the renewable portfolio standard.Nextly,this paper puts forward the overal idea of power purchase strategies of electricity sales companies,and based on electricity purchase cost analysis and risk assessment method of electricity sales companies,it constructs electricity purchase decision models for electricity sales companies in the conventional energy contract market,conventional energy spot market,renewable energy contract market,excess consumption spot market,and green certificate spot market.Under the constraints of meeting the load demand and the minimum consumption weight of renewable energy,the power purchase costs and risks of electricity sales companies are minimized.Finally,in order to verify the validity of the model,this paper selects the actual data of a electricity sales company in the PJM market of the United States,conducts an empirical study on the electricity purchase decision models of electricity sales companies,and analyzes the influence of different development periods,different confidence levels and different quota targets on the power purchase decision of electricity sales companies according to the calculation results.The power purchase optimization decision model proposed by this paper is of great significance for electricity sales companies to optimize the proportion of power purchase in different markets and realize their own long-term development in the new electricity market environment.To some extent,it provides reference value for improving the development of renewable energy policies in China,perfecting the power market mechanism,and achieving sustainable development of renewable energy.