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Voltage control method of Y-type connected direct-current bus of serially-connected H bridge multi-level grid-connected inverter

A technology of DC bus voltage and control method, applied in the field of power quality and multi-level research

Inactive Publication Date: 2012-10-10
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The DC-side voltage balance problem of the delta-connected series H-bridge topology has been well solved, but for the Y-type topology, no literature has proposed a good method to control the DC-side voltage of the three-phase and each H-bridge module. And compensate the negative sequence current generated by the unbalanced load

Method used

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  • Voltage control method of Y-type connected direct-current bus of serially-connected H bridge multi-level grid-connected inverter
  • Voltage control method of Y-type connected direct-current bus of serially-connected H bridge multi-level grid-connected inverter
  • Voltage control method of Y-type connected direct-current bus of serially-connected H bridge multi-level grid-connected inverter

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Embodiment Construction

[0069] refer to figure 1 , The Y-type topology series H-bridge grid-connected inverter is connected in parallel with the load, and operates as a reactive power compensator. The main circuit structure of the Y-type topology series H-bridge grid-connected inverter mainly includes: two H-bridge modules per phase and one incoming inductor. Among them, the DC side energy storage element is generally composed of power capacitors connected in series and parallel, and the voltage source PWM converter is composed of fully controlled devices such as IGBT and GTO. One end of the incoming line inductance is connected in series with the H-bridge module, and the other end is connected to the common access port of the power system. The selection of its parameters mainly depends on the switching frequency of the H-bridge module.

[0070] For the convenience of description, in the present invention, two modules are taken as examples for detailed description. The three-phase voltage of the po...

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Abstract

The invention provides a voltage control method of a Y-type connected direct-current bus of a serially-connected H bridge multi-level grid-connected inverter, which controls the whole serially-connected H bridge multi-level grid-connected inverter to absorb active power from a power grid, so as to realize stable total direct-current bus voltage of three phases. Needed zero sequence voltage is synthesized by a Y-type topological structure through detection and calculation so as to adjust balance between every two phases of direct-current buses; module instruction voltage between every two phases is finely tuned and the active power adsorbed by each module is redistributed, so that the active power which is actually adsorbed by the module can cancel the loss of the module; and therefore, each module can be stably operated under the rated instruction voltage value.

Description

technical field [0001] The present invention relates to the field of power quality and multi-level research, in particular to a voltage equalization control method between three-phase busbars in a Y-type connection topology, specifically to achieve balance among three-phase DC busbars by injecting zero-sequence voltage into the topology . Background technique [0002] Power electronics technology has very broad application prospects in power systems, and its typical applications include static var generators, dynamic voltage restorers, static voltage compensators, static phase compensators, power flow controllers, active power filters and High frequency rectifier etc. [1] . Central to these typical applications are grid-connected inverters. With the development of society, the application of power electronics technology in the power system is gradually developing towards the medium and high voltage field, so the demand for medium and high voltage large-capacity grid-conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 刘进军杜思行林继亮
Owner XI AN JIAOTONG UNIV
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