Research On Primary Frequency Modulation Characteristics And Optimization Of 1 000 MW Ultra Supercritical Unit

With the continuous development of social economy,the demand for electricity is also increasing,and the requirements for the grid-connected operation and management of the power system are gradually strict.Therefore,in order to standardize the grid-connected operation management and auxiliary service management of the power system,the National Energy Administration,the State Electricity Regulatory Commission and various regional power regulatory agencies have issued "Two Rules"(the Implementation Rules for the Management of Grid-connected Operation of Power Plants and the Implementation Rules for the Management of Auxiliary Service of Grid-Connected Power Plants).At the same time,the energy structure transformation of our country is entering a critical period.Along with the continuous transformation of the energy structure of our country,the proportion of grid-connected new energy is increasing continuously.However,because of the uncontrollability and volatility of new energy will aggravate the frequency of the power side,it is necessary to deal with the fluctuation of frequency caused by the new energy grid-connected.To ensure that the next frequency modulation of thermal power unit can be carried out safely and stably.Therefore,how to optimize the performance of primary frequency modulation of thermal power units is an important research direction.In addition,when the proportion of new energy power generation connected to the grid increases,the installed proportion of thermal power units in the power system gradually decreases due to the adjustment of energy structure,but the current frequency modulation of the power grid still mainly depends on thermal power units,which leads to the need for better ability to control and adjust the frequency of thermal power units.Under these circumstances,the performance of primary frequency modulation of 1 000 MW ultra supercritical unit requires more stringent requirements.How to optimize the performance of primary frequency modulation of thermal power units is of great significance.This paper takes 1000MW ultra supercritical unit as the research object.For thermal power unit unit coordinated control system(Coordinated Control System,CCS)and steam turbine digital electro-hydraulic governing system(Digital Electro-Hydraulic Control System,DEH)model research,through the analysis of the transfer function of the process,In the MATLAB Simulink function,DEH model and CCS model are established in different modules to study the primary frequency modulation process of thermal power units.Among them,the electro-hydraulic control system model,electro-hydraulic servo system model,steam turbine model and CCS pulverizing system model,boiler model and pipeline pressure loss model are deduced and established.The model was simulated and verified according to the actual data.The obtained results match well with the measured data of thermal power units,which proves the feasibility of the model and can be used in the study of primary frequency modulation of thermal power units.Thus,it has a reference significance for the study of primary frequency modulation of 1 000 MW ultra supercritical unit.This paper also briefly describes the primary frequency modulation performance optimization method of thermal power units,selects the valve flow characteristic curve optimization method,uses particle swarm optimization algorithm,and improves the particle swarm optimization algorithm,adapts the inertia weight and learning factor of particle swarm optimization algorithm,and proposes an optimization method of valve flow characteristic curve based on this improved particle swarm optimization algorithm.The valve flow characteristic curve is better so that the thermal power unit has better performance of primary frequency modulation.