Electrical circuit modeling method, simulation test system and simulation terminal

Abstract

The invention provides an electrical circuit modeling method, a simulation test system and a simulation terminal. The method comprises the following steps: enabling the on-state of a nonlinear switching device in an electrical circuit to be equivalent to equivalent inductance, and enabling the off-state of the nonlinear switching device to be equivalent to equivalent capacitance; building a capacitor and a capacitor discrete model in an electrical circuit according to the equivalent capacitor; building an inductance discrete model according to the equivalent inductance and inductance in the electrical circuit; processing according to the capacitance discrete model and the inductance discrete model to obtain an equivalent model; and processing the equivalent model by using a node analysis method to obtain an electrical circuit multiplication model. According to the electrical circuit modeling method, the simulation test system and the simulation terminal provided by the invention, the electrical circuit real-time transient simulation test system can be built, a more efficient test scheme is provided for an electrical circuit control technology, the experimental research and verification time of the electrical circuit control technology is effectively reduced, the development cost is saved, and the development period is shortened.

Description

technical field [0001] The invention relates to the technical field of electrical circuit modeling, in particular to an electrical circuit modeling method, a simulation test system and a simulation terminal. Background technique [0002] At present, high-frequency isolation transformers are often used in power systems, such as high-voltage power electronic transformer circuits, energy storage circuits in auxiliary converter systems in urban rail transit, etc. High-frequency isolation transformer circuits have high control frequency and main circuit The topological forms are diverse and so on. [0003] However, there are several difficulties in designing a real-time test system for high-frequency isolation transformer control software: [0004] 1. Difficulty in modeling complex topology: the main circuit has various topological forms, and it will be very difficult to write differential equations for transient analysis of the circuit, especially if the circuit contains a larg...

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Problems solved by technology

[0004] 1. Difficulty in modeling complex topology: the main circuit has various topological forms, and it will be very difficult to write differential equations for transient analysis of the circuit, especially if the circuit contains a large number of nonlinear power electronic devices, the solution process will be more complicated and affect The Efficiency of the Development of Hardware-in-the-loop Simulation Platform

[0005] 2. Too large calculation steps lead to large errors: the real-time object model of the high-frequency isolation transformer runs in the CPU of a high-performance real-time simulator, and the simulation step size is tens of microseconds. When the switching frequency of the high-frequency isolation transformer is high When the value is high, the simulation error caused by the sampling error will be larger

[0006] In the prior art, the control frequency of the circuit of the high-frequency isolation transformer is up to 30kHz, and the minimum pulse width duty cycle is calculated as 5% of the control cycle, and the time of the minimum pulse width is T min =1 / 30000*5%=1.67e-6s, and there are a large number of nonlinear switching devices in the circuit of the high-frequency isolation transformer, which makes it difficult to analyze the switching state using the existing model

The circuit of the high-frequency isolation transformer implies inductive components before and after the nonlinear switching device. In the high-frequency isolation transformer, the first diode or the second diode connected to the secondary winding of the transformer is conducting In this state, the inductance on the secondary winding of the transformer is connected in series with the filter inductance, and there is a difficulty that the model decoupling is easy to diverge when using the differential equation to solve the problem

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