Research On The System Cost Of New Energy In Jilin Province Based On Sequential Producation Simulation

China has to accelerate the transformation of energy structure under the carbon neutral goal.The power system should gradually transform to a clean,low-carbon and efficient power system dominated by new energy.With the rapid development of new energy installation in China,large-scale integration of new energy into the power system will cause changes in the operation mode of conventional power units.And the system cost caused by new energy needs to be reasonably accounted.The system cost accounting of new energy is also conducive to rationalizing the cost price mechanism development and promoting the large-scale development of new energy in the future.In order to calculate the system cost of new energy,this paper defines the concept of new energy system cost from the overall level of power system at first,which includes coal power operation cost increment,idle cost and wind and light curtailment cost.According to the literature,the system cost is divided into several parts for calculation,but these costs are intertwined in essence.The sequentisl production simulation model can simulate the operation state of power system from short period to medium and long term based on the principle of minimum total cost of the system.And it analyzes the additional cost of new energy from the overall level of the power system.Therefore,based on this model,this paper simulates the wind and solar output operation,and constructs a new energy grid system cost calculation method.Based on the power structure of Jilin power system,this paper sets five scenarios of new energy penetration from 0%to 40%to calculate the change of new energy system cost.The case study shows that with the increase of penetration,the system cost will continue to increase,and the growth rate will accelerate after 20%penetration,reaching 123.5 yuan/MWh when the penetration is 40%.Among them,the idle cost of coal-fired power units accounted for 69%of the system cost,accounting for the highest proportion;the cost of wind and light curtailment ranked second,accounting for 26%,and the incremental operation cost of coal-fired power accounted for 4.7%.The analysis results of demand response and power transmission to improve system flexibility during peak load and valley load show that,they can effectively reduce the system cost.At the same time,it is estimated that the integration cost of wind power is 21.7%of the feed-in-tariff in Jilin Province.Through comparative analysis,it can be seen that the integration cost and the system cost calculated by the sequentisl production simulation model is essentially caused by the impact of the output characteristics of new energy on the power system.The rationalization measures to reduce the system cost of new energy are put forward,such as further improving the auxiliary service market rules and product design of Jilin Province,expanding the scale of cross-provincial transmission and improving the flexibility of power system.The system cost of new energy calculated in this paper can provide a reference for clarifying the cost and feed-in-tariff mechanism of new energy.And it can also contributed to clarify the interest relationship between conventional units and new energy in the power system.Finally,this study can help to promote the research of new energy consumption and improve the flexibility of the power system.