Research On Wind Power Consumption Of CHP With Thermal Energy Storage Based On The Demand Response

Since the 21st century,along with the rapid economic growth of human society,energy demand has increased extraordinarily,which has caused a series of serious problems such as greenhouse effect,environmental pollution,energy shortage,high incidence of haze and so on.In this regard,government in China has put forward the strategic planning to develop renewable energy power generation.In the past ten years,the total installed capacity of wind power in China has been developing rapidly by leaps and bounds.At present,China has become the largest country in the world with the total installed capacity.Although wind power has the advantages of low carbon,environmental protection and renewable,due to the randomness and volatility of wind power,large scale of wind power generation connected with grid will have a great negative impact on the safety and stability of the grid.In this regard,how to realize the large scale wind power grid and reduce the phenomenon of abandoning wind power,is worthy of further study.Aiming at the above problems,with the guidance of demand response,this paper makes use of the time-of-use(TOU) electricity price strategy to achieve the goal of shaving peak and filling valley.Meanwhile,thermal energy storage is added in CHP(combined heat and power) to decouple "thermal-electro" constraint and improve the ability to load capacity.In this paper,with the aim of minimum system coal consumption,a joint optimal operation model is established including CHP with thermal energy storage,wind power,conventional thermal power units,and demand response.This paper gives a brief introduction of the working principle and characteristics of wind power and pumped storage power station,and makes benefit analysis of the combined operation system.Combined with the regional power grid in China,this paper aims at the economic optimization of the combined operation system.Under the premise of satisfying the electric load and the heat load of the system and the constraints of the operation of each unit,the improved particle swarm optimization algorithm(PSO) based on simulated annealing is used to simulate and solve the problem with the simplified example,and the joint operation system is replaced by none.By comparing the systems under the working mode with or without thermal heat storage and TOU price strategy,the wind power absorption and economic benefit of the combined operation system are analyzed.In addition,the functions of TOU price strategy on peak shaving and valley filling of power grid system are also analyzed.The simulation results show that the TOU price strategy has improved the peak regulating ability of the system,played an excellent role in peak shaving and valley filling,enhanced the stability of the power grid,and has also resulted in that,the fluctuation of the wind power output has significantly reduced,and the curve of the wind power output has been more gentle.In addition,with the thermal heat storage,the combined operation system has improved the level of wind power absorption,reduced the occurrence of wind power abandonment,and reduced the coal consumption of thermal power units to ensure that the units are operated in economic working areas.Therefore,the combined operation system of CHP with thermal storage and wind power generation based on TOU price strategy,is able to achieve better economic benefits,meet the requirements of energy saving and emission reduction put forward by the government,reduce pollutant emissions,and be environmentally friendly.In summary,based on TOU price strategy,the combined operation system of CHP with thermal heat storage and wind power generation is an effective solution to the problems faced by large-scale wind power integration,has aroused widespread concern,and has an evidently broad application prospect.