Coordinated Control Method Of Stochastic Source And Deterministic Load For Power Grid With Large-scale Wind Power Integration

Large-scale wind power development is a strong support for China's energiewende,which also poses great challenges to system operation.With the integration of large-scale wind power,insufficient peak-shaving capability of the system under the traditional source-source coordination mode causes a large amount of wind power curtailment,which seriously restricts the wind power development.It is necessary to excavate the load-side regulation capability to promote wind power consumption.And the coordination of stochastic wind power and deterministic load is the key point.In this regard,this paper studies coordinated control method of stochastic source and deterministic load for power grid with large-scale wind power integration,so as to solve the matching problem of curtailed wind power and load regulation ability,and make full use of load side regulation ability to consume the curtailed wind power.The main research contents of this paper are as follows:The mechanism of source-load coordination is studied.Firstly,the anti-peak-shaving characteristic and randomness of large-scale wind power are analyzed.Then the impact of large-scale wind power access on peak-shaving regulation and the reasons for wind power curtailment are discussed.Thirdly,the mechanism of consuming curtailed wind power by the coordinated control of source and load is revealed.And the feasibility of the coordinated control of source and load for improving the system's peak-shaving regulation ability and consuming the curtailed wind power is expounded.Regulation characteristic and control mode of loads are studied.The regulation characteristics of large-capacity energy-intensive loads and medium and small-capacity distributed loads are studied respectively.According to the capacity and distribution characteristics of different loads,the large-capacity energy-intensive loadsis taken as the direct controlled loads which adopt the direct control mode.The medium and small-capacity distributed loads,which adopt the aggregated control mode,are aggregated through load aggregators.A light robustness based source-load coordinated control method considering the ancillary regulation from the coal-fueled units is proposed.Based on the analysis of the problem of difficult matching between random wind power and load,a light robust model of source-load coordinated control considering the ancillary power adjustment is established,which takes both wind power consumption and the risk of power imbalance into account.The validity of the proposed source-load coordinated control method is verified by case analysis.A source-load coordinated control method based on the flexibility of aggregated loads and curve similarity is proposed.Firstly,the causes of the unmatched power generated in the aggregated load regulation under traditional aggregated control mode are analyzed.On this basis,the resource flexibility index is proposed to characterize the limited shape of the aggregated load adjustment curve,which makes up for the shortcomings of load regulation considering only the upper and lower limits.Then the source-load coordinated control model based on the flexibility of aggregated loads and curve similarity is established,and the corresponding source-load coordinated control method is proposed.The unmatched energy brought by the mismatch between the adjustment task and the regulation characteristics of aggregated loads is reduced,so that the wind power consumption is improved.Finally,the effectiveness of the proposed method is verified with case analysis.A two-level source-load coordinated control method involving multiple types of loads is proposed.To consume the curtailed wind power with better utilization of the regulation capacity of the loads,this chapter proposes a two-level source-load coordination control framework and method involving multiple types of loads.Based on the research of Chapter 4 and Chapter 5,the upper level carries out the source-load coordination with the sequence of "first direct load control,then the aggregated load control" to maximize the consumption of curtailed wind power and provides a benchmark for the lower level optimization.The lower level establishes a source-load coordinated control model for coordinating the direct controlled loads and the aggregated controlled loads.On the basis of ensuring the curtailed wind power consumption in the upper level source-load coordinated control,the source-load coordination efficiency is improved by the lower level coordination.Finally,simulation analysis of Gansu Hexi Power Grid demonstrates the effectiveness of the proposed methods.