Equivalent magnetic-flow difference transient state modeling method of nonlinear magnetic circuit 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 (a high-voltage magnetically controlled shunt reactor), comprising the steps of: describing nonlinear magnetic circuit property with arc hyperbolic functions; decoupling a coupling magnetic circuit equation by providing and utilizing a magnetic-flow substitute algorithm; and establishing an equivalent magnetic-flow difference electromagnetic transient state modeling method. The invention not only accurately reflects the continuously smooth regulation property of a saturated magnetic circuit of the super / extreme-high voltage magnetically controlled shunt reactor and prevents the numerical oscillation of piecewise linearization algorithm, but also can meet the requirements of real-time / faster-than-real-time simulation computation without modifying an admittance matrix and influencing computing speed under the condition of large-range continuous regulation, provides a necessary simulation tool for the real-time electromagnetic transient state computation of the super / extreme-high voltage magnetically controlled shunt reactor and also initiates a new idea for the real-time electromagnetic transient state modeling method of a nuclear element.

Description

Technical field [0001] The invention belongs to the field of digital simulation modeling methods, and in particular relates to a transient modeling method of equivalent magnetic flux difference of the nonlinear magnetic circuit of a magnetron shunt reactor, which can be applied to a modeling method of saturated magnetic circuit elements, especially Digital modeling and simulation of magnetron shunt reactor. Background technique [0002] With the construction of the Three Gorges Hydropower Project, Jiuquan tens of millions of kilowatt wind power bases, and Qinghai / Gansu large-scale photovoltaic power stations, the backbone of China’s AC power system is to solve the problem of the extremely unbalanced distribution of primary energy such as coal and water conservancy and load centers. The grid should adopt ultra-high-voltage compact lines to achieve long-distance and large-capacity power transmission, and give full play to the important role of the grid in optimizing the allocation ...

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Problems solved by technology

[0007] Regarding the theoretical research on the mathematical modeling of high-voltage magnetron shunt reactors, only "a digital simulation modeling method for magnetron shunt reactors" (application number: 200810056973) involves magnetron shunt reactors. The simulation modeling method of shunt reactor, its main principle is to use the existing saturated transformer and reactor splicing to simulate the characteristics of magnetron shunt reactor, which has important reference value for the further research of high voltage magnetron shunt reactor , but the accurate mathematical model of the core mechanism of the reactive magnetron shunt reactor has not been established, and it uses the compensation method and the piecewise linearization method. The compensation method not only needs repeated iterations, but also causes real-time / ultra-real-time electromagnetic transient simulation Moreover, the difference between the normalized Φ-I magnetization curve and the actual excitation characteristics causes a large calculation error in the model; although the piecewise linearization method is simple to calculate, it inevitably causes numerical oscillation between different sections, and exceeds / UHV magnetron shunt reactor is not a general nonlinear element fine-tuning in a small range, but a large-scale continuous smooth adjustment. The segment linearization method can neither satisfy the calculation accuracy of its large-scale adjustment, nor can it reflect the intelligent and flexible characteristics of its continuous smooth adjustment, which erases many advantages and characteristics of the main body components and damages the accuracy of the mathematical model

Moreover, using the piecewise linearization method not only cannot describe the continuous smooth adjustment characteristics of the magnetic control shunt reactor, but also has a large error in simulation accuracy, which cannot meet the needs of power system electromagnetic transient simulation

[0008] Due to the large adjustment range and frequent adjustment of ultra / ultra-high voltage magnetron shunt reactors, the admittance matrix must be frequently modified according to the previous electromagnetic transient modeling method, which will take up a lot of memory and time. Simulation calculations pose great difficulties and challenges

For the difficult problem of transient regulation in the previous research, there is no literature research that has been reported

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