| With the development of the economy and the progress of society,the demand for renewable energy sources such as wind and photovoltaic is increasing.Due to the volatility and uncertainty of wind power and photovoltaic,the large-scale integration into the grid will have a negative impact on the operational stability of the grid.At the same time,China is still mainly dependent on thermal power to generate electricity,but burning fossil fuels emits large amounts of CO2,which can exacerbate the greenhouse effect.Therefore,we need to address not only the impact of the high proportion of wind and photovoltaic power generation into the grid,but also the CO2 emissions from thermal power generation.Firstly,taking into account the impact of a high proportion of wind power and photovoltaic grid integration on the power grid,combined with the natural complementary characteristics of wind power and photovoltaic,as well as the role of hydropower and pumped storage in suppressing wind and light waves,a wind light water fire storage complementary power generation system is established.Avoiding the inherent shortcomings of each energy source,and through coordination and cooperation,transforming the originally volatile and uncertain wind and solar energy into stable and adjustable power sources,reducing the impact on grid operation safety during grid connection and reducing the burden on thermal power generation units.Secondly,from the perspective of energy conservation and emission reduction,taking into account various constraint conditions,the optimal scheduling model of wind,solar,water storage and thermal power is established with the objective functions of maximizing economic benefits and minimizing output power fluctuations of complementary combined power generation systems.Given the different objective functions used to calculate the output arrangement plan of wind,solar,and water storage,the actual load value is calculated through the predicted load curve of the power grid,thereby obtaining the output power of the thermal power unit.Taking the Mengzi Power Station as an example,simulation verification through numerical examples shows that establishing a pumped storage power station as an energy storage system in areas with abundant light intensity and hydraulic resources can reduce the impact of the volatility and randomness of wind and photovoltaic power generation on thermal power units and the power grid while consuming the majority of wind and photovoltaic power generation;It also proves that the regulation capacity of pumped storage power plants with an installed capacity of 300MW is limited.When the proportion of renewable energy increases to 54%,the CO2 emissions and thermal power generation stability of the complementary combined power generation system reach their peak,at 127.64 ×103kg and 15.94%,respectively.Finally,starting from energy conservation and emission reduction,carbon capture units are used to capture CO2 generated by thermal power units.Taking into account operating costs,fuel costs,pollutant treatment costs,and carbon trading mechanisms,various constraints are comprehensively considered.The simulation results show that carbon capture units can not only effectively weaken the volatility of new energy,avoid the impact of wind and light grid connection on the power grid,but also reduce carbon emission intensity. |
