Filter-based electromagnetic transient state simulation method and system

Abstract

The invention relates to a filter-based electromagnetic transient state simulation method and system. The method comprises, through a group of simulative filter circuits, simulating a plurality of groups of LCC (leadless chip carrier) converter station alternate current filters of the same kind to the simulative filter circuits, and through a parameter setting method, simulating the switch operation of the LCC converter station alternate current filters, wherein the parameter setting method is a method in which the electromagnetic transient state equivalent computing circuit of the filter circuits in real time corrects a historical current source. By compressing a dozen of alternate current filters of a practical LCC converter station into a plurality of types for simulation in an electromagnetic transient state program, the filter-based electromagnetic transient state simulation method and system can greatly reduce the number of electrical nodes and elements of a direct current powertransmission electromagnetic model, accelerate simulative models, and meanwhile have no loss in the filtering effects of the filters or the simulation precision of dynamic switching processes, therebyhaving high practical promotion values.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic transient analysis of power systems, and in particular relates to a filter-based electromagnetic transient simulation method and system. Background technique [0002] In HVDC transmission, the structure of the LCC converter station determines that it will generate a large number of characteristic harmonics and generate more reactive power demand. In addition, due to the unsatisfactory operation conditions, the characteristic harmonics generated by the converter In addition, there are some non-characteristic harmonics in the power grid in actual operation. In order to filter out these harmonics and compensate a certain amount of reactive power, the converter station needs to set up multiple types of filters for each main harmonic, so as to switch on demand. These filters generally use passive filters and are composed of RLC devices, so there will be more energy storage devices. [0003] A...

AI Technical Summary

Problems solved by technology

In the simulation calculation, it is reflected in the need for corresponding nodes, which greatly increases the order of the admittance matrix and increases the amount of calculation, which is not conducive to the rapid operation of the simulation.

In addition, each switching process will lead to changes in the network topology, and the network equation needs to be re-established during the simulation process, and the calculation efficiency is limited

These are not conducive to the realization of real-time simulation

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