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Harmonic matrix transfer function-based system stability analysis method for grid-connected inverter

A technology of system stability and analysis method, which is applied in the field of grid-connected inverter system stability analysis based on harmonic matrix transfer function, can solve problems such as complex calculations, and achieve the effect of simplifying the derivation process

Active Publication Date: 2018-05-04
ZHEJIANG UNIV +1
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Problems solved by technology

The phase domain model in the analytical impedance model is established in the stationary coordinate system, and its impedance model is the easiest to measure in practice, and can be extended to unbalanced harmonic grids; however, the harmonic linear method is required to establish the phase domain impedance model, which requires Frequency domain convolution operation, the calculation is more complicated

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  • Harmonic matrix transfer function-based system stability analysis method for grid-connected inverter
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  • Harmonic matrix transfer function-based system stability analysis method for grid-connected inverter

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Embodiment Construction

[0043] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Such asfigure 1 As shown, the grid-connected inverter system stability analysis method of the present invention includes the following steps:

[0045] (1) According to the modeling object, get such as figure 2 The shown inverter topology and its control block diagram.

[0046] Among them, the voltage and current of the grid-connected point are recorded as v a , v b , v c i a i b i c , figure 2 The superscript of the middle symbol is to further clarify that the above variables are voltage and current components located in the stationary coordinate system. v d and v q i d and i q are the dq components of grid-connected point voltage and grid-connected current, respectively, i dr and i qr are the command values ​​of the grid-connected ...

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Abstract

The invention discloses a harmonic matrix transfer function-based system stability analysis method for a grid-connected inverter. According to the invention, a nonlinear trigonometric function is transformed into a linear matrix through Toeplitz transformation, so that a mature linear control block diagram simplification theory can be applied during the phase domain impedance derivation process. The model derivation process is greatly simplified. The method is suitable for the phase-domain impedance modeling of a three-phase grid-connected inverter. Even when a system control method is adjusted, for example, a feedforward compensation controller is added, a system impedance model can still be quickly calculated. Therefore, the stability analysis can be carried out on the system.

Description

technical field [0001] The invention belongs to the technical field of grid-connected inverters, and in particular relates to a method for analyzing the stability of a grid-connected inverter system based on a harmonic matrix transfer function. Background technique [0002] With the large-scale access of new energy in the grid, grid-connected inverters are widely used as the energy transmission interface between new energy and the grid, such as new energy grid-connected, HVDC transmission system, flexible AC transmission system, etc. The large-scale integration of power electronic devices such as grid-connected inverters in the grid has caused new stability problems in the interconnected system, such as the subsynchronous oscillation problem that occurs between the control system of power electronic devices and the series compensation device of transmission lines. [0003] The stability analysis method based on the impedance model obtains the port impedance characteristics o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G06F17/50
CPCG06F30/30H02J3/38H02J2203/20Y02E60/00
Inventor 年珩陈亮徐韵扬黄弘扬马骏超吕文韬宣晓华陆承宇楼伯良吴跨宇
Owner ZHEJIANG UNIV
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