Dynamic magnetic resistance based equivalent reactance transient state modeling method of magnetically controlled shunt reactor

Abstract

The invention provides a practical decoupling electromagnetic transient state modeling method for describing the nonlinear magnetic saturation property of a super / extreme-high voltage magnetically controlled shunt reactor (MCSR), comprising the steps of: providing a transient equivalent reactance algorithm on the basis of a dynamic magnetic resistance idea under AC / DC mixed excitation; reflecting the real-time dynamic change property of the saturated equivalent reactance under the condition of the AC / DC mixed excitation; accurately describing the magnetizing and demagnetizing effect of network side AC current on a reversely series-wound DC excitation saturation magnetic circuit in two main magnetic circuits of the super / extreme-high voltage magnetically controlled shunt reactor (MCSR); describing nonlinear magnetic circuit property with arc hyperbolic functions; decoupling a coupling magnetic circuit equation; differencing transient equivalent reactance by an implicit trapezoid integration algorithm with damping; and establishing an electromagnetic transient state model. The invention not only accurately reflects the continuously smooth regulation property of the saturated magnetic circuit of the super / extreme-high voltage magnetically controlled shunt reactor (MCSR) and prevents the numerical oscillation of piecewise linearization algorithm, but also can meet the requirements of real-time / faster-than-real-time simulation computation under the condition of large-range continuous regulation.

Description

technical field [0001] The invention relates to the field of digital simulation modeling of power systems, and can be applied to the modeling method and controller design of saturated magnetic circuit elements, as well as the digital modeling simulation and engineering application of magnetically controlled shunt reactors, and specifically relates to a magnetically controlled parallel reactor. Transient modeling method of equivalent reactance of shunt reactor based on dynamic reluctance. Background technique [0002] With the construction of the Three Gorges Hydropower Station, the Jiuquan 10 million-kilowatt wind power base, and the Qinghai / Gansu large-scale photovoltaic power station, in order to solve the problem of extremely unbalanced distribution of primary energy such as coal and water conservancy and load centers, the backbone of my country's AC power system The grid structure should adopt ultra / ultra-high voltage compact lines to realize long-distance and large-capac...

AI Technical Summary

Problems solved by technology

[0010] Due to the saturation characteristics of MCSR with multi-magnetic circuit AC and DC hybrid excitation, this poses a huge obstacle to the calculation and analysis of its magnetic circuit and circuit, especially under AC and DC hybrid excitation, the equivalent reactance of the input system changes dynamically, and DC excitation In the two saturated magnetic circuits in reverse series, there is also the magnetization and demagnetization effect of the grid side AC current on the DC excitation

In the modeling method, if the simple electromechanical model of external characteristics based on experience and measured values ​​is studied, there is not much difficulty and technical content, and there is no more practical significance; but if the magnetic circuit of MCSR is studied based on rigorous mathematical theory The detailed working principle of the circuit and the accurate electromagnetic transient modeling method are very difficult and tricky

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