Research On Operation Strategy Of Thermoelectric Combined Optimization

The high proportion of renewable energy resources has intensified the reserve configuration pressure for power system.In view of the appeal for solving the contradiction between the large-scale penetration of renewable energy and reserve configuration,relying on CHP plant's existing heat storage devices in cogeneration system(CGS),taking integrated energy system(IES)as the background,taking the coordinated optimization of heat and power as the research method,taking the reserve resources provided by the heat storage device as the thread,taking the scheduling space improvement of CHP unit as the core and taking coping with wind power uncertainty and improving its accommodation as the goal,this paper carries out research on operational strategy within integrated energy systems to adapt to the high proportion development of renewable energy.The main work is as follows:(1)Make an introduction of main component's characteristic and its regulation ability in CGS.Under the background of heat-and-power-coordination,the Lagrange function including the operating characteristic of CHP unit is constructed and the synergistic relationship between heat and power is derived to reveal the cooperation rule,clearing the effect of heat storage device to further improve operating efficiency and economy for CHP unit operating at the feasible region boundary.The content of this chapter can lay the foundation for the subsequent research on exploring the operating flexibility of heat storage device.(2)Considering the bi-directional reserve regulation flexibility of the heat storage device under different operating conditions,its influence on the scheduling result and the reserve configuration is analyzed.Besides the direct reserve,the concept of indirect reserve for CHP unit under different thermal load conditions is defined and quantified to jointly cope with the uncertainty in the power system.The influence of the heat storage device operation flexibility on system scheduling result and reserve resource configuration is studied,which can provide a theoretical reference for the deep coordination and optimization.(3)Focusing on the cooperation between thermal power plants and wind farms in the CGS,the thermoelectric coordination operation strategy is studied.Through the horizontal coordination optimization between heat and power,reasonable operational strategy of the CGS can be optimized by complementing the uncertain wind power,making the CGS be dispatched and controlled.On the basis of accurately grasping the initiative capability in the system,taking into account the bi-directional regulation flexibility derived from heat storage,the optimization dispatch model is established.The power of CHP unit and heat storage device is optimized to maximize the total operating profit of the system.Also,the effect which the wind power uncertainty,the flexibility of heat storage device and the electricity price signal have on the operation strategy of the CGS are studied.With the large-scale development of renewable energy sources,the study can be applied to the northern power grid of China with long heating period and large proportion of wind curtailment.It will provide some degree of guiding significance in the problem solution of wind curtailment caused by the high overlap between high wind power generation and heating period.Meanwhile,it can also enrich and develop the operational scheduling theory and method of CGS in the context of IES.