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

A power system and power electronics technology, applied in circuit devices, design optimization/simulation, electrical components, etc., can solve the problems of poor simulation results, failure to preserve the nonlinear dynamic characteristics of AC systems and DC power grids, errors, etc. It is beneficial to the realization of engineering promotion, to meet the requirements of simulation accuracy and numerical stability, and to improve the effect of simulation efficiency.

CN106372339AActive Publication Date: 2017-02-01TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-01

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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.
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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...

Examples

Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] The following describes the multi-rate simulation method and device for a power electronic power system according to an embodiment of the present invention with reference to the accompanying drawings. First, the multi-rate simulation method for a power electronic power system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0029] figure 1 It is a flowchart of a multi-rate simulation method for a power electronic power system according to an embodiment of ...