Research On The Maximum Ability And Key Influencing Factors Of New Energy Consumption In Provincial Power Grid

In recent years,in response to energy security,ecological environment,climate change and other issues,my country has actively promoted the development and utilization of new energy.However,the output of new energy has randomness and volatility,leading to a series of problems such as voltage stability and frequency safety,which restrict the consumption level of new energy to a certain extent.Based on the key influencing factors that restrict the level of new energy consumption,this paper conducts a study on the maximum capacity of new energy consumption in the provincial power grid taking into account voltage stability constraints and frequency safety constraints,and new energy units participate in frequency regulation to improve the level of new energy consumption in the provincial power grid Feasibility.The main research contents are as follows:Based on the PSD-BPA simulation platform,the simulation models of wind farms,photovoltaic power plants,thermal power plants and hydropower plants required by the thesis are introduced,and then a provincial power grid model is built based on these models.The maximum capacity of new energy consumption considering voltage stability constraints is studied.Firstly,the influence of large-scale new energy collection in the transmission-end power grid on the static voltage stability of the converter bus is studied,and the calculation formula of the voltage regulation sensitivity of the converter bus is derived.The calculation process of the maximum grid-connected photovoltaic capacity considering the static voltage stability constraint is given,and the maximum capacity of new energy consumption of the photovoltaic energy base considering the static voltage stability constraint is evaluated.Then,the transient over-voltage problem of the sending-end system under the high-proportion new energy outbound scenario are studied respectively,and the maximum capacity of the provincial power grid to absorb new energy in consideration of the transient voltage stability constraints is obtained.The maximum capacity of new energy consumption taking into account the frequency safety constraints is studied.First of all,according to the changes in the grid frequency under different proportions of new energy generation after the failure and the situation that the output of new energy units basically remains unchanged,it is proved that as the proportion of new energy generation in the grid increases,the frequency safety problem will become more prominent.Taking into account the frequency safety constraints,conduct research on the maximum capacity of new energy consumption.Then determine the respective setting principles according to different faults.Under a single fault,the power grid can adjust itself to ensure that the frequency is within the specified range;after a single serious fault occurs,the frequency safety is maintained through the implementation of security control measures;after multiple serious faults,the security control measures and The third line of defense ensures that the frequency does not exceed the limit.Finally,comprehensively consider a variety of key influencing factors to evaluate the maximum capacity of the provincial power grid for new energy consumption.The influence of new energy generators’ participation in frequency modulation on the capacity of new energy consumption is studied.First,based on PSD-BPA,a simulation model of a new energy unit with the function of participating in primary frequency modulation is built,and the influence of parameters such as the frequency modulation dead zone and the power change rate corresponding to t he frequency deviation on the frequency modulation ability of the new energy unit is analyzed.Based on the actual grid application,the system frequency characteristics change after the new energy participates in the primary frequency modulation is simula ted,which verifies the accuracy of the model and the feasibility of the new energy unit participating in the frequency modulation to improve the new energy absorption capacity.Finally,the new energy primary frequency modulation parameters are optimized,and the simulation results show that the optimization can not only improve the frequency characteristics,but also reduce the power flow of the line.