Multi-rate simulation method and device for power-electronizing power system

Abstract

The invention discloses a multi-rate simulation method and a multi-rate simulation device for a power-electronizing power system. The method comprises: dividing the power-electronizing power system into a slow subsystem and a plurality of fast subsystems; establishing equivalent models respectively; setting simulation parameters; performing power flow calculation on the power system to obtain a steady-state initial value of the power system; establishing interfaces between the plurality of fast subsystems and the slow subsystem, and establishing a time-varying Thevenin equivalent circuit and a time-varying Norton equivalent circuit; and obtaining interface parameters according to the established time-varying Thevenin equivalent circuit and the established time-varying Norton equivalent circuit, and parallelly solving node admittance equations corresponding to the equivalent models of each fast subsystem and the slow subsystem until simulation ends up so as to obtain an electromagnetic transient state simulation result. By the simulation method provided by the embodiment of the invention, the non-linear dynamic characteristics of the internal part of an alternating current system or a direct current power grid can be maintained; meanwhile, the simulation efficiency is obviously improved relative to a single step length result.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-rate simulation method and device for a power electronic power system. Background technique [0002] As a large number of power electronic devices such as flexible DC (two-level topology, multi-level topology, etc.), traditional high-voltage DC, new energy, and power electronic solid-state transformers are connected to the system, the number of network-scale nodes increases sharply and power electronics frequently change topology. The characteristics lead to the frequent solution of the network node admittance matrix, which leads to a sharp drop in simulation efficiency. At present, the electromagnetic transient simulation of power system including power electronic equipment can only be simulated on a small scale, and the scale and efficiency of the current simulation are difficult to meet the requirements of power grid operation, planning or behavior characteri...

AI Technical Summary

Problems solved by technology

However, none of the related technologies can preserve the nonlinear dynamic characteristics of the AC system or the DC grid, not only the reliability of the simulation results is poor, and sometimes even wrong results

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