Impedance calculation method and system based on coordinate transformation
A technology of impedance calculation and coordinate transformation, applied in the direction of AC network circuits, electrical components, circuit devices, etc.
Active Publication Date: 2020-09-29
CHINA ELECTRIC POWER RES INST
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[0009] At present, there is no relevant scientific and technical means to use coordinate transformation to model the small signal of the inverter system. By considering the influence of coordinate transformation on the impedance calculation of the virtual synchronous generator, the impact of the impedance calculation error on the virtual synchronous generator can be reduced. stability impact
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[0154] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0155] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0156] The present invention provides an impedance calculation method based on coordinate transformation, such as figure 1 As shown, the included:
[0157] 101. Determine the small si...
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The invention relates to an impedance calculation method and system based on coordinate transformation. The method comprises the following steps: determining a deviation angle small signal matrix of an equivalent dq coordinate system of a disturbed virtual synchronous generator and an initial dq coordinate system according to parameters of the disturbed virtual synchronous generator under the initial dq coordinate system; determining a duty ratio disturbance matrix in a main circuit small signal model of the virtual synchronous generator under the equivalent dq coordinate system by utilizing the deviation angle small signal matrix; converting the duty ratio disturbance matrix in the main circuit small signal model of the virtual synchronous generator under the equivalent dq coordinate system into a duty ratio disturbance matrix in the main circuit small signal model of the virtual synchronous generator under the initial dq coordinate system; and determining an output impedance matrix of the virtual synchronous generator after disturbance by utilizing the duty ratio disturbance matrix in the main circuit small signal model of the virtual synchronous generator under the initial dq coordinate system. According to the impedance calculation method provided by the invention, the impedance of the weak power grid line after disturbance is accurately calculated.
Description
technical field [0001] The invention relates to the field of inverter modeling, in particular to an impedance calculation method and system based on coordinate transformation. Background technique [0002] A large amount of new energy power generation is distributed in remote areas such as the Gobi, mountains, and islands. The connection strength between it and the main grid is weak, and the grid usually presents the characteristics of high inductance and weak grid. When new energy grid-connected inverters are connected to weak power grids, harmonic oscillation and other interactive stability problems are likely to occur. The virtual synchronous generator simulates the external characteristics of the synchronous generator and provides new technical means for large-scale new energy-friendly grid connection, which has become a hot spot in the current new energy power generation technology. [0003] Virtual synchronization technology changes the traditional inverter control st...
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IPC IPC(8): H02J3/00H02J3/38H02J3/40
CPCH02J3/00H02J3/40
Inventor 周晨李官军余豪杰陶以彬桑丙玉崔红芬刘欢
Owner CHINA ELECTRIC POWER RES INST