Research On Coordination And Optimization Of Multiple Reserves In Power System With Renewable Energy

Reserve capacity of electric power system plays an important role in stabilizing the frequency and voltage of the system,improving the reliability of power supply for users,and ensuring the safe operation of the power grid.Traditional system reserve configuration schemes are often based on deterministic criteria,and N-1 criteria and load percentage criteria are commonly used.However,the uncertainty of new energy output may cause insufficient or surplus grid reserve capacity in some areas,affecting the reliability and economy of grid operation.Therefore,the traditional grid reserve configuration strategy needs to be improved urgently.With the gradual acceleration of the construction of inter-provincial tie lines in my country,power systems in different regions can realize the reasonable distribution and utilization of power resources through inter-regional tie lines.Cross-province and cross-regional reserve sharing is one of the feasible methods to solve the problem of reserve shortage.And it will be an important development trend of the future power dispatch mode.In addition,the existing power system mainly uses reserve measures on the power generation side to achieve real-time power balance.When there is a large gap in the output of new energy,there will be a load loss problem due to the slow startup of coal power units,and there are minimum technical output constraints and abandonment.Problems such as serious wind abandonment and high risk of power outages.In addition,considering the gradual retirement of coal-fired power plants,it is necessary to fully discover and tap other rapid power adjustment resources,such as the role of demand-side reserve resources,and find technically reliable and economically feasible smart grid solutions.Electric vehicles(EV)connected to the grid(V2G)standby have the characteristics of fast response speed,small market impact,and flexibility.The Ministry of Industry and Information Technology mentioned in the consultation on the development plan of the new energy vehicle industry that by 2030,the number of new energy electric vehicles will reach 10 million,and the annual sales of new energy electric vehicles will reach 40% of the total annual sales of vehicles,so much.Large-scale electric vehicle access makes the number of V2 G power and electricity aggregated by electric vehicles very considerable.Therefore,it is possible to consider using electric vehicle V2 G to make up for the shortage of power generation side reserve.In summary,taking into account the current research deficiencies,this article conducts research on the following:(1)Research on the quantitative relationship between system reliability and spinning reserve capacity: This paper takes into account the multiple uncertainties of new energy power forecast errors and load forecast errors,and proposes the minimum up/down that meets the reliability level and new energy absorption capacity The spare demand determination model is used as the constraint condition of the subsequent multiple spare coordination optimization models and the basis for evaluating the optimization results.(2)Evaluation of the spare capacity of EV users with load-side reserve considering the reliability of load response calls: Based on the EV user’s daily V2 G power and the failure probability of the Ambient Intelligence(AMI)system for load response,Calculated the V2 G power that the EV user can respond at a certain time in the future,that is,the reserve capacity of the EV user.As a preparation for multiple standby coordination optimization models of subsequent interconnected systems.(3)Research on multi-area and multi-reserve coordination and optimization technology: Taking the multi-area interconnected system energy/reserve joint scheduling as the supporting framework,a multi-area reserve coordination optimization model considering multiple reserves is proposed.Three scheduling schemes are set up,and the IEEE39 node and IEEE30 node interconnection system is selected for simulation verification.The simulation results show that: breaking the barriers between provinces and performing regional reserve sharing coordination scheduling can greatly improve the reliability of the area with sufficient power.Power supply reliability in areas with insufficient power,and promote the cross-regional consumption of new energy in the system;EV participates in V2 G as a reserve on the load side,and the reliability and economy of power supply in each regional system are further improved,which is helpful to alleviate the phenomenon of insufficient reserve configuration in power-deficient areas.Important role.(4)Research on the dynamic allocation strategy of new energy participation in system reserve: According to the peak shaving requirements of the system,new energy is included in the reserve in a reasonable manner,and the system load loss risk after the new energy is included in the reserve is correctly characterized to ensure that the new energy After being included in the reserve,the reliability of the system’s power supply can still be maintained at a high level.