| As the structural reform strategy in the energy source-side of China keeps advancing,the power system with high proportion of renewable energy will become a new scenario in the future.In this scenario,the installed capacity proportion of renewable energy such as wind and photovoltaic power continues to increase,while that of conventional power decreases accordingly.The limited regulation capability of conventional power has difficulty meeting the increasing regulation demand of the system with increasing integration of wind and photovoltaic power.There is an urgent need to excavate the potential of active power regulation on the area load-side,conduct the research on wide area source-load optimization dispatching,and promote the consumption of high proportion of renewable energy.However,the time/space distribution characteristics of wide area source-load increase the difficulty of traditional source-load coordinated optimization dispatching.Specifically:1)In terms of time operation characteristics,how to achieve the multiple time scale optimal matching of the anti-peak-shaving and random uncertainty characteristics of wind and photovoltaic power and the differentiate regulation characteristics of wide area source-load,has become the core and difficult problem of fully excavating the potential of wide area source-load regulation and promoting the consumption of high proportion of renewable energy.2)In terms of space distribution characteristics,wide area source-load space unbalanced distribution characteristics of "wind and photovoltaic power wide area distribution;conventional power source concentrated distribution" and "resident load wide area distribution,energy-intensive load concentrated distribution",has increased the demand of wide area source-load coordinated dispatching in different spaces,and expanded the space dimension of traditional source-load coordinated dispatching.It can be seen that the traditional source-load coordinated optimization dispatching method ignores the time/space differentiate operation characteristics of wide area source-load,and it is difficult to adapt to the scenario of power system with high proportion of renewable energy.It is urgent to study new dispatching methods and theories.To this end,this paper studies a wide area source-load coordinated optimization dispatching method for the power grid with high proportion of renewable energy,to solve the optimal time/space scale matching problem of wind and photovoltaic power regulation demand and wide area source-load regulation capability,thus to achieve the goal of fully excavating the wide area source-load regulation capability and further promoting the consumption of high proportion of renewable energy.The main research contents of this article are as follows:Firstly,the wide area source-load coordinated optimization dispatching mechanism is studied for the power grid with high proportion of renewable energy.The time/space operation characteristics of wind and photovoltaic power,conventional power and wide area load,and their influence on the consumption of wind and photovoltaic power are analyzed.In view of the space unbalanced distribution characteristics of wide area source-load in capacity.voltage level and location,etc.,the wide area source-load intra-area/inter-area optimization dispatching mechanism is studied.Based on this,combining the matching characteristics of wind and photovoltaic power regulation demand and wide area source-load regulation capability in different time scales,the wide area source-load time/space coordinated optimization dispatching mechanism is studied.Secondly,a wide area source-load coordinated optimization dispatching mode for the power grid with high proportion of renewable energy is proposed.According to the active power regulation characteristics of wide area source-load,regulation models of discrete,continuous,and transferable load are established,and the direct and indirect regulation modes are proposed.Based on this,combining with the wide area source-load coordinated optimization dispatching mechanism,the partition optimization dispatching mode of wide area source-load intra-area/inter-area cooperation is proposed,and the wide area source-load time/space coordinated optimization dispatching mode is also proposed.Then,in order to fully excavate the potential of wide area source-load active power regulation capability in the intra-area grid,a two-layer wide area source-load intra-area optimization dispatching method considering the load random response regulation process is proposed.The time coupling and random uncertainty characteristics of the transferable resident load in the response regulation process are analyzed,and the corresponding process model is established,and the regulation parameters of the aggregated resident load are calculated;On this basis,the two-layer wide area source-load intra-area optimization dispatching method considering the load random response regulation process is proposed,to achieve the goal of fully excavating the potential of source-load regulation in the intra-area grid and promoting the local consumption of wind and photovoltaic power;The effectiveness of the proposed method is verified by a case analysis.In addition,in order to coordinate the wide area source-load active power regulation capability in the inter-area grid,a wide area source-load inter-area coordinated optimization dispatching method is proposed considering the high-order uncertainty of wind and photovoltaic power.Combined with the cloud model theory,a high-order uncertainty quantitative model of wind and photovoltaic power is established;Based on this,combined with the distributed robust optimization theory,considering the total transfer capability of key transmission interfacsection in the power grid,a wide area source-load inter-area coordinated distributed robust optimization dispatching model is established considering the high-order uncertainty of wind and photovoltaic power,and using the multi-dimensional sequence calculation theory,the model solution is simplified;Furthermore,the wide area source-load inter-area coordinated optimization dispatching method is proposed considering the high-order uncertainty of wind and photovoltaic power,and the optimal active power regulation plan of conventional power and energy-intensive load is obtained,for further promoting the consumption of wind and photovoltaic power.The effectiveness of the proposed method is verified by a case analysis.Finally,considering the time differentiate operation characteristics and space unbalanced distribution characteristics of wide area source-load,a wide area source-load time/space coordinated optimization dispatching method is proposed for the power grid with high proportion of renewable energy.Firstly,the wide area source-load time/space coordinated optimization dispatching framework is presented for the power grid with high proportion of renewable energy.On this basis,under the day-ahead time scale,based on the research results of Chapter 4 and 5,the wide area source-load day-ahead coordinated partition-area optimization dispatching method is proposed to maximize wind and photovoltaic power consumption,and provide a reference for intra-day source and load optimization dispatching;on the intra-day time scale,combined with DSMPC theory,this paper proposes a wide area source-load intra-day coordinated optimal dispatching method to maximize the consumption of curtailed wind and photovoltaic power;Based on the above,a wide area source-load time/space coordinated optimal dispathing method for the power grid with high proportion of renewable energy is proposed.Finally,a simulation example of Gansu Power Grid was used to verify the feasibility and effectiveness of the proposed method. |
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