Study On The Shared Spinning Reserve Capacity Allocation Strategy Of The Regional Interconnected Power System

Sufficient reserve of the electric power system is important for stabilizing the system frequency and voltage,improving power supply reliability,ensuring the safe and stable operation of the power grid.The traditional certainenty reserve allocation strategy is based on the deterministic criteria,such as the maximum capacity of the system unit or the percentage of system peak load.However,the reserve allocated by the strategy above may cause insufficient reserve and poor reliability or surplus reserve and poor economy.In addition,the integration of wind power and other new energy resources has brought great impact to the stable operation of the power grid.Therefore,the traditional power reserve allocation strategy needs to be improved.With the development of economy,the interconnection between different regions has been accelerated,the regional power systems can reasonably allocate and utilize the power resources through the regional tie-line,and support each other in the sudden accident.By setting up the shared reserve between regions,it can improve the system’s ability to resist risks and reduce the total amount of reserve capacity for the whole network.To a certain extent,it can improve the security and economy of regional power grid.Therefore,taking into account both reliability and economy of the regional interconnected power system,building the reserve capacity allocation model with shared reserve capacity support for the regional interconnected system and to determine the strategy of reserve allocation in power system is of great theoretic value and practical significance.Firstly,considering the uncertainty factors such as forced outage of generation units,wind power output and predicted-deviation of load,and taking into account the system stability constraints,then based on the reliability chance-constrained programming,the reserve capacity optimization model of single zone system is established which takes the purchase cost of spinning reserve,the frequency deviation for power system and the loss of outage as the objective.The algorithm of mutation particle swarm optimization based on the improved fast sorting method is used to solving the optimization model,and to get the optimal strategy of reserve allocation speedily.Secondly,considering the reserve capacity characteristics of each subsystem which constituted interconnected power systems,the subsystems was divided into three categories,then based on the reliability chance-constrained programming,the reserve capacity optimization model of regional interconnected power grid is established which quantified the sharing reserve capacity and its calling procedure.The algorithm of mutation particle swarm optimization based on the improved quick sort method is adopted for solving the optimization model.Finally,Merit of the algorithm is validated by its application to IEEE standard test system.Considering the influence of different optimization objectives,the reserve capacity allocation scheme for single zone system and regional interconnected system is obtained.At the same time,the influence of the reliability security constraints,the system load changes and the wind power Integration on the system reserve allocation results are analyzed,and the sensitivity analysis of the key parameters in the system model is carried out.Results show that,compared with the deterministic reserve scheme used in the practical power system,the reserve capacity and the economy of power system is reduced in this model under the premise of ensuring the reliable operation of the system,and compared with the single area system,the regional interconnected system can improve the reliability and economy of the system,which provides a new way for the research of the reserve capacity allocation strategy.