Sampling period online prediction-based fixed switching frequency digital hysteresis control method

A technology of switching frequency and sampling period, applied in the field of fixed switching frequency digital hysteresis control based on online prediction of sampling period, which can solve the problems of increased loss and difficult to effectively filter switching harmonics

Inactive Publication Date: 2016-08-17
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The traditional hysteresis tracking control algorithm adopts a fixed loop width, and the switching frequency of power electronic switching devices always fluctuates within a large range, resulting in increased losses during the switching process, and it is difficult to effectively filter out the harmonics caused by switching, so the switching frequency is fixed The hysteresis tracking control algorithm of the

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  • Sampling period online prediction-based fixed switching frequency digital hysteresis control method
  • Sampling period online prediction-based fixed switching frequency digital hysteresis control method
  • Sampling period online prediction-based fixed switching frequency digital hysteresis control method

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Embodiment Construction

[0050] The present invention is described in further detail below in conjunction with accompanying drawing:

[0051] Such as figure 1 As shown in , the single-phase voltage inverter adopts a single-phase bridge inverter circuit, the DC side is connected to a capacitor C or a DC power supply, and the AC side is connected to the power grid through an incoming inductance L. The circuit principle is as follows: when the main circuits S1 and S4 are turned on, and S2 and S3 are turned off, the inverter output current increases; when the main circuits S2 and S3 are turned on, and S1 and S4 are turned off, the inverter output current decreases.

[0052] The control method proposed by the present invention is as figure 2 As shown, the specific digital implementation is as follows image 3 and Figure 4 As shown, this method can calculate the sampling period and switching action time according to the grid voltage, output current, command current and switching frequency, and constitu...

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Abstract

The invention discloses a sampling period online prediction-based fixed switching frequency digital hysteresis control method. The control method is applied to control of an output current of a two-level inverter and implementation of a digital scheme on the basis of a hysteresis comparison tracking control theory. According to the scheme, the sampling period can be predicted online; the minimum sampling frequency is achieved; and the switching frequency of a power electronic device is fixed through a real-time 'prediction-correction' algorithm. The control method disclosed by the invention is high in response speed, high in tracking accuracy and good in system robustness; meanwhile, the sampling frequency requirements of hardware equipment are reduced; and the control method has actual engineering application value.

Description

Technical field: [0001] The invention belongs to the research field of converter control, in particular to a digital hysteresis control method with fixed switching frequency based on online prediction of sampling period. Background technique: [0002] As electric energy plays an increasingly important role in social production, power electronics technology is increasingly widely used. Power electronic converters use controllable switching devices, and their performance is affected by related control technologies. Research on the control technology of converters has attracted attention. [0003] Fully controlled devices represented by insulated gate bipolar transistors (IGBTs) are widely used in converters, and pulse width modulation (PWM) control technology shows significant advantages. The hysteresis control method is a commonly used PWM tracking control technology. The hysteresis controller feeds back the deviation value of the output current and the command current in re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395
CPCH02M7/5395H02M1/0012
Inventor 易皓王振雄卓放
Owner XI AN JIAOTONG UNIV
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