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Control method of DC bus voltage of cascading multi-level power quality conditioners

A technology of power quality and control method, which is applied in the field of grid power quality research, can solve problems such as unbalanced capacitor voltage, affecting device compensation effect, affecting device safety, and stable operation, and achieves good reference value and easy-to-implement effect

Inactive Publication Date: 2011-01-19
XI AN JIAOTONG UNIV
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Problems solved by technology

If there is no additional control measures, the imbalance of capacitor voltage will not only affect the compensation effect of the device, but even affect the safe and stable operation of the device

Method used

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  • Control method of DC bus voltage of cascading multi-level power quality conditioners
  • Control method of DC bus voltage of cascading multi-level power quality conditioners
  • Control method of DC bus voltage of cascading multi-level power quality conditioners

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Embodiment Construction

[0028] refer to figure 1A series multilevel power quality conditioner 3 is connected between the three-phase power supply 1 and the nonlinear load 2 . The main circuit structure of the series multilevel power quality conditioner 3 mainly includes: 6 single-phase full-bridge unit modules 3a1, 3a2, 3b1, 3b2, 3c1, 3c2 and 3 incoming inductances. The single-phase full-bridge unit module consists of a DC side energy storage element C ak ~C ck (k=1, 2) and voltage source PWM converters 301~306, in which the DC side energy storage elements are generally composed of power capacitors connected in series and parallel, and voltage source PWM (pulse width modulation) converters use fully controlled devices such as IGBT , GTO and other components. One end of the line inductance 31, 32 and 33 is connected in series to the A, B, C three-phase voltage source PWM converter, and the other end is connected in parallel between the three-phase power supply 1 and the nonlinear load 2. The select...

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Abstract

The invention discloses a control method of the DC bus voltage of cascading multi-level power quality conditioners. The control method is verified by simulation through a simulink module in a MATLAB (Matrix Laboratory), meanwhile, a small experimental prototype with the capacity of 30 kVA and formed by connecting two single-phase full bridge unit modules in series is set up in the laboratory, and the control method is verified by experiments. Both simulation results and experiment results can verify that the control method can well stabilize the DC side voltage of the single-phase full bridge unit modules to equal to a given value, increase the utilization rate of the DC bus voltage and provide a good reference value for engineering application.

Description

technical field [0001] The invention belongs to the field of power quality research of power grids, and in particular relates to a method for controlling DC bus voltage of series multilevel power quality regulators. Background technique [0002] The series multilevel converter is composed of two or more single-phase full-bridge circuits in series. Each single-phase full-bridge inverter is powered by an independent DC power supply, and outputs three levels through different combinations of switch tubes. Finally, Then the levels of each bridge are superimposed to synthesize the final output waveform. This structure has a modular structure and can be extended to n levels arbitrarily; no clamping diodes and capacitors are required, and for the same number of levels, the number of components required is the least, and it can save bulky transformers, etc., and has attracted widespread attention in recent years. . When it is used in a power quality conditioner, since the device m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/08
Inventor 何英杰刘进军刘铁
Owner XI AN JIAOTONG UNIV
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