Converter electromagnetic transient modeling method based on segmented generalized state space averaging
A state space averaging, electromagnetic transient technology, applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., can solve difficult converter simulation, incompletely applicable power system, no converter frequency change analysis, etc. problems, to achieve the effect of improving modeling efficiency, reasonable model, and ensuring accuracy
Active Publication Date: 2017-10-27
HEFEI UNIV OF TECH
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Problems solved by technology
The transient action of the converter is complex, and the converter model used in the simulation has different applications according to the balance between accuracy and efficiency. However, the current converter model is not completely suitable for large-scale new energy generation grid-connected power Efficient Simulation of System Electromagnetic Transient
[0003] In the current research results, the methods for modeling converters mainly include dynamic phasor method, state space averaging method, etc. Electromagnetic Transient Modeling
The traditional grid-connected converter model only conducts basic principle analysis at the device level, and it is difficult to complete detailed electromagnetic transient process analysis
The transient model of the state average method can only reflect the fundamental wave component of the system, and the error ripple and high-frequency components need to be considered separately, which cannot adapt to the continuous simulation of large-scale new energy grid connection
In the existing research results, there is no direct analysis of the frequency change and error of the converter, so it is difficult to achieve accurate and efficient simulation of the converter under complex actions
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[0053] In this embodiment, a converter electromagnetic transient modeling method based on segmented generalized state space averaging, calculates the duty cycle and duty cycle variance of each switching cycle from the amplitude prediction, and changes the duty cycle variance according to the Reasonable segmentation of streamer simulation time. Combining the segmental method with the generalized state space averaging method, the Fourier series expansion of the state variables is carried out at each segmental time, and the Fourier series expansion coefficient is used to represent the state variables for averaging, and the segmental generalized state of the converter is established. State-space averaging models. According to the Fourier series expansion coefficients of the state variables at each segment time, the approximate error and relative error of the state variables are directly calculated to realize model verification and error analysis. Specifically, if figure 1 As sho...
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The invention discloses a converter electromagnetic transient modeling method based on segmented generalized state space averaging. The method is characterized by comprising the steps that 1, a system initial value is calculated; 2, the number of segments and all segmenting time are determined based on amplitude prediction; and 3, a converter segmented generalized state space averaging model is established. Through the method, balance of efficiency and precision can be realized on converter electromagnetic transient modeling, and therefore the converter model is suitable for electromagnetic transient modeling and simulation of a large-scale parallel-series power grid.
Description
technical field [0001] The invention relates to the field of electromagnetic transient modeling of converters in power systems, in particular to a modeling method for electromagnetic transient simulation considering converter switching action, balance model accuracy and efficiency. Background technique [0002] The large-scale access of new energy power generation (such as photovoltaics and wind turbines) in the power system has led to changes in the operation mode of the power system. Dynamic characteristics of power systems. The transient action of the converter is complex, and the converter model used in the simulation has different applications according to the balance between accuracy and efficiency. However, the current converter model is not completely suitable for large-scale new energy generation grid-connected power Efficient simulation of system electromagnetic transients. [0003] In the current research results, the methods for modeling converters mainly inclu...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王磊邓新昌
Owner HEFEI UNIV OF TECH