Impedance modeling method of voltage source type inverter

A voltage source type, modeling method technology, applied in electrical components, circuit devices, photovoltaic power generation, etc., to achieve the effect of being conducive to popularization and application, simple expression, and high model accuracy

Active Publication Date: 2019-05-24
HUNAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a voltage source inverter impedance modeling method to solve the problem of voltage source inverter small signal impedance modeling when impedance reconstruction control is considered. problem

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  • Impedance modeling method of voltage source type inverter
  • Impedance modeling method of voltage source type inverter
  • Impedance modeling method of voltage source type inverter

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Embodiment Construction

[0024] figure 1 It is the main circuit topology of the voltage source inverter. Among them: the switching tubes Q1~Q6 constitute the three-phase inverter full bridge of the voltage source inverter; V dc is the DC side voltage of the voltage source inverter, which can be considered as a stable value; e a 、e b and e c is the internal potential of the voltage source inverter; i oa i ob and i oc is the output current of the voltage source inverter; v sa , v sb and v sc is the output terminal voltage of the voltage source inverter; L sf 、C sf and r sf are the filter inductance, filter capacitor and parasitic resistance of the filter inductance of the voltage source inverter, respectively.

[0025] figure 2 It is a block diagram of the control method of the voltage source inverter. The voltage source inverter control is the decoupling control of the voltage outer loop and the current inner loop, and the impedance reconstruction control is added on this basis. Therefo...

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Abstract

The invention discloses an Impedance modeling method of a voltage source type inverter. According to the method, the mutual coupling influences of the dq-axis variables of the inverter are considered,and the impedance reconstruction control and the voltage feedforward control are added during the control process. A voltage source type inverter broadband small signal modeling method based on a sequential impedance model is provided. The correctness of the established model is verified. The problem of voltage source type inverter small signal impedance modeling is solved. The model establishedby the invention can accurately reflect the impedance characteristic of the voltage source type inverter in a broadband. Therefore, a theoretical model basis is provided for analyzing phase-locked loop parameters, current controller parameters, voltage controller parameters and filtering parameters to the voltage source type inverter. According to model provided by the invention and used for analyzing the small disturbance stability in the scenes that the voltage source type inverter is connected to a microgrid, a new energy field station and the like, the application popularization of the voltage source type inverter in the microgrid is facilitated.

Description

technical field [0001] The invention relates to the field of power electronic system modeling, in particular to a small signal sequence impedance modeling method of a voltage source inverter. Background technique [0002] In the wide application of power electronics technology, voltage source inverter technology plays a pivotal role in renewable energy. As one of the most important forms of real-time control and transformation of electric energy, it has been widely used in various fields of society. , especially in this era of advocating energy conservation and environmental protection, it has a bright future in the field of new energy technology. In recent years, renewable energy technology has been paid more and more attention by countries all over the world and has developed rapidly. In the technical application of the voltage source inverter, because the impedance characteristic of the voltage source inverter is not clear, it is very difficult to analyze its impedance s...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCY02E10/56
Inventor 罗安刘津铭伍文华陈燕东谢志为王海宁郭健徐元璨彭上
Owner HUNAN UNIV
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