Method for calculating maximum transmission power of tie line considering new energy and direct current

Abstract

The application discloses a kind of new energy and maximum transmission power calculation method and system of tie line considering direct current, belong to large power grid safety and stability analysis and control technical field.The method of the present application comprises: for the interconnection system of new energy and direct current, the equivalence system is obtained by carrying out equivalence to the interconnection system, when the equivalence system is disturbed by fault, determine whether the kinetic energy of the equivalence system is all converted into potential energy on tie line;When the equivalence system is disturbed by fault, if the accelerated action of direct current and wind turbine is determined, the accelerated kinetic energy caused by fault disturbance is determined, then the potential energy of the equivalence system exists on the tie line of region;Determine the moment when the kinetic energy is completely converted into potential energy, it is the moment when the transmission power of tie line is maximum, according to the calculation model, the maximum transmission power of tie line at this moment is calculated.The method of the present application can reveal the influence of direct current and new energy on the transmission capacity of alternating current system, and provide a theoretical basis for subsequent control.

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