With the proposal of China's"dual carbon"goal,the penetration rate of new energy generations in power system is gradually increasing.Due to the randomness and volatility of new energy sources such as wind and solar,while improving the energy structure,new challenges are also posed to power grid.To meet frequency regulation needs of power grid,a method of energy storage capacity configuration considering inertia demand was proposed.First by analyzing control structure of the synchronous machine,unbalanced power allocation of energy storage participating in frequency modulation was calculated.Second considering the limiting conditions of frequency change rate and frequency deviation,a mathematical model was established between the maximum power increment,equivalent inertia constant,and adjustment coefficient that the power system can withstand based on the inertia constant and rated capacity of the synchronous machine.Finally the required capacity and inertia of the energy storage system were calculated.By simulating different energy storage capacities,it was verified that this method can effectively improve frequency deviation of the system,enhance frequency regulation performance of the grid,and provide a theoretical basis for energy storage capacity configuration.
maximum power incrementequivalent inertia constantadjustment coefficientenergy storage capacity configuration
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