Multi-step step length variable electromagnetical transient emulation method

Abstract

The invention provides a simulation method of multistep variable step size which is capable of considering any multiple events in electromagnetic transient calculation, namely, event search is carried out to every step of calculation; precise occurrence time of an event is obtained; re-calculation is carried out till the position of a break point, the event is solved, the sequencing problem of the multiple events happening synchronously or within a simulated step size is solved; and then multistep variable step size backward Euler method is adopted to completely eliminate numerical oscillation occurring in electromagnetic transient simulation. The method precisely calculates the occurrence time of the event, can completely eliminate the numerical oscillation and process event sequence with arbitrary combination, and is suitable for the electromagnetic transient technology of a system of a power electric device provided with mass quick break.

Description

technical field [0001] The invention relates to the field of simulation and calculation of the electromagnetic transient process of a power system, in particular to a multi-step variable-step electromagnetic transient simulation method considering the occurrence of arbitrary heavy events. Background technique [0002] In the electromagnetic transient simulation, due to the action of the switching device and the change of the network structure, such as the direct disconnection of the circuit containing the inductance, the conduction and cut-off of the power electronic device, etc., the non-state variable swings abnormally after the event occurs, which is the electromagnetic Numerical Oscillation Phenomena in Transient Simulations. [0003] Electromagnetic transient simulation calculations generally use implicit trapezoidal integrals to convert differential and partial differential equations into simple algebraic equations with characteristic difference equations, which have f...

AI Technical Summary

Problems solved by technology

However, since the 1970s, it was found that the use of implicit trapezoidal integrals in electromagnetic transient calculations may lead to numerical oscillation problems: for example, when the switch disconnects the inductor branch current, the voltage across the inductor will exhibit numerical oscillations around the correct value; similarly, when When a voltage source suddenly charges a capacitor through a switch, the capacitor current will also exhibit a similar numerical oscillation phenomenon

[0052] The defect of the "synchronous response method" is that it cannot accurately calculate the event occurrence time. When multiple events occur successively in one simulation step, the sequence cannot be processed. It can only be considered that multiple events occur at the same time at the same time, so " The calculation step size of "synchronous response method" cannot be too large

Images