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A Dimension Reduction Method for Converter Multidimensional Frequency Domain Impedance

A technology of frequency-domain impedance and converters, applied in AC network circuits, reducing/preventing power oscillation, electrical components, etc., can solve problems such as increasing analysis complexity and inconvenient understanding, and simplify the control design and stability evaluation process Effect

Active Publication Date: 2020-08-25
上海中绿新能源科技有限公司
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Problems solved by technology

Therefore, the existing methods generally use the generalized Nyquist criterion for stability analysis, which increases the complexity of the analysis and is not easy to understand

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  • A Dimension Reduction Method for Converter Multidimensional Frequency Domain Impedance
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  • A Dimension Reduction Method for Converter Multidimensional Frequency Domain Impedance

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Embodiment Construction

[0038] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0039] Please refer to Figure 1-Figure 5 , this embodiment describes in detail the dimensionality reduction method of the multi-dimensional frequency-domain impedance of the converter of the present invention, and this embodiment takes a three-phase two-level converter as an example for description.

[0040] Please refer to figure 1 , the three-phase converter grid-connected system in this embodiment includes: a three-phase converter and a Thevenin equivalent grid, and an L-shaped filter inductor is used on the AC side of the converter; the internal impedance of the Thevenin grid is represented by RL. In the con...

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Abstract

The invention discloses a dimensionality reduction method for multi-dimensional frequency-domain impedance of a converter, which includes: taking the grid-connected point as the system division point, respectively establishing the positive and negative sequence impedance models of the converter and the AC grid; The positive and negative sequence impedance models of converters are multi-dimensional impedance models, and there is coupling, analyze the coupling characteristics of the multi-dimensional impedance model, and establish the control system of the multi-dimensional impedance model, including: positive sequence path, negative sequence path and the coupling between the two The closed-loop analysis of the control system established above is carried out to obtain the equivalent positive and negative sequence impedance models of the converter under the positive sequence independent external disturbance and the negative sequence independent external disturbance, and the equivalent positive and negative sequence impedance models of the AC grid. Negative sequence impedance model. The dimensionality reduction method of the multi-dimensional frequency-domain impedance of the converter of the present invention can simplify stability evaluation and model verification without affecting accuracy.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a dimensionality reduction method for multi-dimensional frequency-domain impedance of a converter. Background technique [0002] With the rapid development of new energy sources, power electronic converters are widely used, among which three-phase voltage source converters are the most common. However, the large-scale centralized development of new energy has led to a large proportion of converters in local power grids. Due to their different characteristics from conventional synchronous power supplies, new energy grid-connected problems have occurred frequently in recent years, and the typical one is wind farms. / Supersynchronous Oscillation. [0003] Existing studies have shown that the occurrence of these oscillation problems is closely related to the control of the converter and its parameters, and can endanger the stable operation of the power system under certai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/38H02J3/24H02J2203/20
Inventor 蔡旭张琛吕敬
Owner 上海中绿新能源科技有限公司
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