Method for rapidly calculating parameters of multi-port equivalent network element with embedded electromechanical transient simulation

Abstract

The invention relates to a method for rapidly calculating parameters of a multi-port equivalent network element with embedded electromechanical transient simulation, and belongs to the technical field of electromechanical-electromagnetic transient hybrid simulation analysis of a power system. The method comprises the steps of determining the topology of a power network, based on a normal operation state or fault state of the power grid, forming a network node voltage equation matrix--an admittance matrix Y, and factorizing the matrix Y to obtain a result matrix A storing factorization; solving upper and lower triangular parts of the matrix A respectively to obtain a solution vector, then reconstructing a compression impedance matrix M and obtaining an inverse matrix compression admittance matrix E; according to elements of the matrix E, forming an equivalent multi-port network containing parameters and corresponding to a hybrid simulation sub-network interface actual topology; and obtaining the self impedance and mutual impedance of the actual topology in the electromechanical-electromagnetic hybrid simulation interface equivalence, and ending the calculation. The calculation process is simple, the result is accurate, and the efficiency and calculation speed of the calculation method are greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of electromechanical-electromagnetic transient hybrid simulation analysis of electric power systems, and particularly relates to a method for quickly calculating the parameters of multi-port equivalent network elements embedded in electromechanical transient simulation. Background technique [0002] Power system electromechanical transient simulation is mainly used to analyze the stability of the power system, and it is also used to analyze whether the power system can return to the original operating transition or transition after a certain period of time after a certain disturbance in a normal operating state To a new stable operating state. At present, electromechanical transient simulation software or programs for large power grids mostly use sparse admittance matrix to store network information. Based on this information, multi-port equivalent network component parameters can be calculated efficiently, quick...

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Problems solved by technology

[0003] It is also a common method to calculate the equivalent impedance by using the three-phase short-circuit current of the interface node and the steady-state power flow. There are often differences in the equivalent transient potential of generators. In most cases, the equivalent potential cannot be strictly guaranteed to be constant, and there is a certain deviation when solving the equivalent impedance

Due to the use of symmetrical fault information based on power flow impedance, to solve the negative sequence and zero sequence equivalent impedance, a series of transformations are required to convert the negative sequence and zero sequence parameters, the calculation speed is slow, and it cannot automatically adapt to the actual power grid. load grid structure

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