A small signal modeling method for grid-connected asymmetric cascaded H-bridge converter system
A modeling method and technology for small-signal models, applied in instruments, special data processing applications, electrical digital data processing, etc., and can solve problems such as incomplete small-signal models
Inactive Publication Date: 2019-03-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, the small-signal model proposed in this paper is only a transfer function description of the staircase wave modulation, rather than a description of the entire system, so the small-signal model is incomplete
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[0095] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0096] Such as figure 1 As shown, the grid-connected asymmetric cascaded H-bridge multilevel converter system mainly includes two parts, PowerStage and Control System. Power Stage contains three standard cascaded H-bridges (Cell1, Cell2 and Cell3), LCL filter, grid impedance Z g and grid voltage v g , where the outputs of Cell1, Cell2, and Cell3 are v a1 , v a2 and v a3 . Output voltage v of grid-connected asymmetric cascaded H-bridge multilevel converter i by v a1 , v a2 and v a3 are added together, so for the convenience of modeling and analysis, the Power Stage is established to simplify the circuit, such as figure 2 shown. Control System is the control system of the system, which contains the grid current i g and capacitive current i c Dual current control and modulation strategy, simple and detailed control circuit such as ...
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The invention discloses a small signal modeling method of a grid-connected asymmetrical cascade H-bridge multilevel converter system, belonging to AC-DC converter system modeling. The grid-connected asymmetric cascaded H-bridge multilevel converter system of the invention comprises a power circuit and a converter control system, wherein the power circuit comprises an asymmetric cascaded H-bridge multilevel converter circuit, an LCL filter circuit, a grid impedance and a grid. A method for small signal model of a grid-connected asymmetric cascaded H-bridge multilevel convert system comprises that steps of S1, deriving a small signal model of a power circuit according to a simplified model of the grid-connected asymmetric cascaded H-bridge multilevel converter; 2, derive that grid current igin the control system, Disturbance differential equations of grid current reference signal ig, ref, filtered capacitor current reference signal as shown in the specification and modulation signal um;3, calculate that output voltage vi of a grid-connected asymmetric cascaded H-bridge multilevel convert, and deducing a small signal model of the system without a phase-locked loop; S4, the small signal model of PLL is deduced, and the small signal model of the whole asymmetric cascaded H-bridge multilevel converter system is established. The small-signal modeling method of the grid-connected asymmetric cascaded H-bridge multilevel converter system of the invention has high accuracy, is convenient for system design and stability analysis, and is also suitable for off-grid asymmetric cascadedH-bridge multilevel converter system.
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technical field [0001] The invention relates to a small-signal modeling method for a grid-connected asymmetric cascaded H-bridge converter system of a cascaded H-bridge converter in the technical field of power electronics. Background technique [0002] In order to overcome the shortcomings of grid-connected two-level converters such as low capacity, poor output voltage quality, and difficulty in adapting to the growing medium and high voltage conditions, multi-level converters emerged as the times require. It increases the number of levels to improve output voltage quality and Level, to meet the needs of medium and high voltage working conditions; asymmetric cascaded H-bridge multi-level converters are used in multi-level conversions such as diode clamps and flying capacitors due to their advantages such as large number of output levels, easy modularization, and high device utilization. It stands out from the rest of the world and has gained widespread attention in academia...
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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 韩杨陈浩蔺向阳杨雄超胡鹏飞王丛岭杨平熊静琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA