Electromechanical-electromagnetic hybrid simulation method and system

Abstract

The invention provides an electromechanical-electromagnetic hybrid simulation method and system. The method includes the steps that a bus with the electromagnetic transient network side connected with a power transmission line meeting a preset condition is determined as a hybrid simulation interface position, wherein the electromagnetic wave propagation delay tau on the power transmission line is larger than the electromagnetic transient simulation step size deltat; the k side of the power transmission line is connected with an electromechanical transient network, and the j side of the power transmission line is connected with the rest of networks of the electromagnetic transient network; the rest of networks of the electromagnetic transient network, the power transmission line and the electromechanical transient network are equivalent to three parts, namely, a part including the j side of the power transmission line and the rest of networks of the electromagnetic transient network, a part including the k side of the power transmission line and an equivalent circuit of the electromechanical transient network and a part including an equivalent circuit of the electromagnetic transient network and the electromechanical transient network; the three parts are solved respectively to obtain the power grid state of the electromagnetic transient network and the electromechanical transient network. By means of the technical scheme, the interface calculation amount is greatly reduced, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to a digital simulation method of a power system, in particular to an electromechanical-electromagnetic hybrid simulation method and system. Background technique [0002] The frequency range of the transient process and dynamic process response of the actual power system is from zero hertz to several megahertz, covering physical processes with different time scales from low-frequency oscillation, subsynchronous oscillation, transient process, subtransient process to system traveling wave. It is neither possible nor necessary to establish a detailed mathematical model for large-scale actual power grids to simulate all physical processes. Traditional time domain simulation uses different mathematical models and simulation algorithms to analyze transient or dynamic processes at different time scales. , forming different methods such as electromagnetic transient simulation, electromechanical transient simulation and medium and long-te...

AI Technical Summary

Problems solved by technology

[0010] (1) When the electromagnetic transient network causes the admittance matrix Y due to switching action, nonlinear saturation and other factors A When changing, it is necessary to solve again When simulating an electromagnetic transient network with power electronic circuits, the admittance matrix on the electromagnetic side will change frequently, resulting in a sharp increase in interface calculations

[0011] (2) When solving the network on the electromechanical side, the admittance matrix Y of the equivalent network on the electromagnetic side is used emt It is always the initial value at zero time, and it is no longer updated during the calculation process, but only the interface voltage and current of the electromagnetic side network, so when the actual topology of the electromagnetic transient network changes, interface errors will be introduced

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