| In recent years,my country’s electricity market trading system is gradually improving,and the medium and long-term trading and ancillary service mechanisms continue to mature.However,due to the high penetration rate of renewable energy and the diversification of load-side resources,uncertainties in the power system have brought great challenges to the construction of the power market.Large-scale and diversified energy storage systems can provide key technologies such as more flexible,short-term and stable energy time-shift and offset adjustment for the power market,especially the auxiliary service market.Based on this,this paper expounds the electrochemical energy storage station(EESS)applied from the perspective of power system dispatching decision makers and the hybrid energy storage aggregator(HESA)applied from the perspective of power system dispatching participants.This paper analyzes the key technologies for the participation of typical energy storage structures in grid auxiliary services,and conducts research through four core issues.The main work of this paper is as follows:(1)Analysis of EESS’s participation in grid-side backup coordination configuration and dispatching operation strategyA two-stage optimization model of day-ahead robust unit combination and intraday stochastic power flow with EESS is established.In the day-ahead configuration stage,considering the influence of network security constraints and reserve capacity constraints on the safe output range of wind power,a model based on the safe output range of wind power is established.Robust Crew Combination Model.In the intraday scheduling stage,a random configuration point construction strategy based on sparse nodes is proposed to calculate the probability optimal power flow,and the influence of energy storage capacity and location on the intraday real-time scheduling results is analyzed.The simulation results show that the proposed method meets the technical requirements of system reserve adequacy and energy storage system’s participation in grid backup auxiliary services,verifies that energy storage participates in backup configuration,and enhances the flexibility,safety and economy of grid operation.(2)Effectiveness analysis of EESS participating in grid-side AGC joint frequency regulation control strategyBased on the two links of schedule tracking control and regional regulation control at the dispatch master station,a frequency regulation control strategy of EESS participating in automatic generation control(AGC)of regional power grid is proposed.In the planning tracking control link,the adaptive power tracking control considering the state of charge(SOC)plan of the energy storage,and the new energy fluctuation stabilization control strategy considering the SOC partition of the energy storage are proposed,so that the energy storage can take into account the grid regulation.Peak and frequency regulation control requirements,and ensure that the energy storage SOC operates in a reasonable range;in the regional regulation control link,the regional regulation demand is divided into different operating ranges,and by introducing the priority strategy between groups and the regional deviation frequency division regulation strategy,the design The adaptive allocation strategy of AGC control groups(EESS,coal-fired units,and gas-fired units)is adapted to the regional regulation demand to realize the balanced transfer of fast and slow regulation capacity,ensure the complementary advantages of various frequency regulation resources,and improve the dynamic regulation performance of the control area.Finally,the effectiveness and superiority of the proposed strategy are verified by simulation and example analysis,respectively.(3)HESA’s participation in the user-side frequency regulation market and joint electric energy market control strategy and income analysisThe control strategy and benefit analysis of HESA as a price receiver considering the uncertainty of electric energy market price,frequency regulation capacity price and frequency regulation mileage price are studied.The VMD-WVD time-frequency domain analysis is carried out for the FM command signal sent by the system operator,and the natural modal components are reconstructed to generate high-frequency and low-frequency signals,which are used as the input signals of HESA medium power storage and energy storage,respectively.The HESA bidding and operation strategy model considering multi-market price uncertainty is constructed,and the min-max-min two-stage robust optimization model is solved iteratively and alternately based on the column and constraint generation algorithm(C&CG)and strong duality theory.The results of the calculation example show that the proposed method can make the HESA subject adapt to the price volatility of the joint market,and the bidding operation strategy can improve the comprehensive income of HESA.(4)HESA participates in the bidding strategy and clearing analysis of the user-side frequency regulation reserve market and the joint electric energy marketThis paper proposes a bidding decision model in which HESA acts as a price maker to participate in multi-variety electricity market transactions,establishes a two-tier model,and proposes a bidding strategy for energy storage power stations to participate in the energy market,frequency regulation,and reserve markets as a price maker.The upper layer is the decision-making and bidding problem with the goal of maximizing the operating income of HESA,and the lower layer is the problem of clearing the multi-variety power market with the goal of maximizing social benefits from the perspective of the system,so as to evaluate the energy storage as the main body of the bidding decision to clear the power market.impact on results.The two-layer model is transformed into a single-layer model with equilibrium constraints based on the underlying KKT conditions.The impact of the multi-variety power market mechanism on the profitability of HESA is quantitatively evaluated,and the impact of lithium battery capacity and supercapacitor capacity on multi-variety market transactions is quantitatively analyzed.The results of the calculation example show that the profit of HESA participating in the transaction of three market varieties of energy,reserve and frequency regulation is higher than that of participating in the transaction of one or two market varieties. |
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