Research On Peak Shaving Control Strategy Of Thermal Power Plant Energy Storage Power Station Based On Combined Heat And Power Generation

With the growth of the Chinese market economy,the evolution of social production,and the improvement of living standards in China,the social energy supply mode has also undergone revolutionary changes.At the same time,China is vigorously promoting new energy power generation,which brings the original thermal power generation production field huge challenges,especially in the field of power grid peak regulation.The proportion of high-quality peak-shaving resources such as hydropower and pumped storage in Shanxi is relatively small,and in recent years,most of the thermal power units have been put into thermal power units.Therefore,establishing a battery energy storage power station in a thermal power plant,will bring a new management perspective to the enterprise.By actively participating in the peak regulation management of electricity consumption,it can not only improve the pattern of power supply resources,but also increase of profits of thermal power plants.Based on a thermal power plant of cogeneration,this paper will establish a battery energy storage power station through simulation,and participate in peak regulation jointly with the thermal power unit.A control strategy with the goal of maximizing the daily peak-shaving operation gain is adopted.In the load valley stage,the battery energy storage system is charged by receiving the surplus power of the generator,and the output power of the combined power generation system reaches the grid-connected power required by the grid,thereby obtaining Peak shaving gain;in the load-leveling stage and peak load stage,the battery energy storage system is discharged,and the output power of the co-generation system is equal to the on-grid power required by the grid dispatching,reducing the power plant’s operation of adding coal and oil to increase the load,so as to obtain the ongrid power gain.Aiming at the unstable DC bus voltage during peak regulation,the effects of PI control and fuzzy PI control in controlling the DC bus voltage in the DC/DC converter are compared through simulation experiments to ensure the DC bus voltage stability of the battery energy storage system.In the AC/DC part,in order to ensure that the battery energy storage system in the actual working conditions,the output power is stable and does not exceed the limit.Comparing the control effects of traditional PI control,sliding mode control and super-twisting sliding mode control,it is verified by simulation experiments that super-twisting sliding mode control is superior to traditional PI control and general sliding mode control,so as to achieve stable output of battery energy storage system output power.Through building the simulation model of thermal power-battery energy storage combined power generation system,an overall peak shaving control strategy suitable for the production and operation mode of a thermal power plant of cogeneration.Based on the load data of the thermal power plant on a certain day,the particle swarm algorithm was used to calculate the generator and storage power and add the over-limit judgment.After being processed by the over-limit standard and being tested by the simulation model,satisfying results are obtained.While keeping the task of heat supply unaffected,it fulfills the task of power generation and gains peak regulation profits by participating in the peak regulation of the power market.It also provides a feasible way for the survival and development of such power generation enterprises.