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A hybrid T-type multilevel inverter device and its control method

A technology of multi-level inverter and control method, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc. It can solve the problems of limiting the application range and the increase of the maximum voltage stress, and achieves the expansion Application range, low voltage stress, and the effect of solving large voltage stress

Active Publication Date: 2021-02-26
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are switched capacitor multilevel inverters in the prior art, but the maximum voltage stress on the switching device increases with the increase of the output voltage gain, which limits its application range to a certain extent

Method used

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  • A hybrid T-type multilevel inverter device and its control method
  • A hybrid T-type multilevel inverter device and its control method
  • A hybrid T-type multilevel inverter device and its control method

Examples

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Effect test

Embodiment 1

[0048] A hybrid T-type multilevel inverter device, which is set at a DC voltage source V dc and load, as attached figure 1 As shown, it includes capacitor strings, reverse series bridge arm I, reverse series bridge arm II, reverse series bridge arm III, intermediate bridge arm, voltage dividing capacitor and positive series bridge arm; the capacitor string and the DC voltage source V dc connected in parallel; the central point of the capacitor string is connected to one end of the reverse series bridge arm I, and the other end of the reverse series bridge arm I is respectively connected to the first connection end of the intermediate bridge arm and the reverse series bridge arm II One end of the reverse series bridge arm III is connected to one end to form a T-shaped bridge arm; the reverse series bridge arm I, the reverse series bridge arm II, the reverse series bridge arm III, the intermediate bridge arm and the partial pressure The capacitor forms a switched capacitor unit...

Embodiment 2

[0055] as attached figure 2 As shown, this embodiment describes the topology structure of the hybrid T-type multilevel inverter device in detail.

[0056] This embodiment provides a specific implementation of a capacitor string, which includes an equivalent capacitor C connected in series in the forward direction. 1 and equivalent capacitance C 2 , the equivalent capacitance C 1 The anode of the DC voltage source V is connected dc positive pole, the equivalent capacitance C 2 The cathode is connected to the DC voltage source V dc of the negative pole, the equivalent capacitance C 1 of the cathode and the equivalent capacitance C 2 The anodes are connected to one end of the load respectively.

[0057] This embodiment also provides a specific implementation of a positive series bridge arm, the positive series bridge arm is used as a direction changing unit, including a switch tube S connected in series in the forward direction 10 and switch tube S 11 , the switching tu...

Embodiment 3

[0081] In this embodiment, the hybrid T-type multilevel inverter device and its control method are verified through simulation. Setup: DC input voltage is 30V, load is 50Ω-100mH, capacitance is 2200μF, switching frequency is 2kHz.

[0082] According to the above control method, the hybrid T-type multilevel inverter device is modulated, as shown in the attached Figure 11 As shown, this embodiment gives the output voltage v of the hybrid T-type multilevel inverter device out and output current i out The simulation waveform of the output voltage and output current is stable, and meets the working conditions of the inverter; the hybrid T-type multi-level inverter device can output the correct target waveform, and the load current is a smooth sinusoidal waveform. The correctness of the hybrid T-type multilevel inverter device and its control method is verified.

[0083] as attached Figure 12 As shown, this embodiment provides the simulation waveform of the capacitor ripple of...

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Abstract

The present invention provides a hybrid T-type multi-level inverter device and its control method. In the inverter device: a capacitor string and a DC voltage source V dc Parallel connection; the center point of the capacitor string is connected to one end of the reverse series bridge arm I, and the other end of the reverse series bridge arm I is connected to the first connection end of the middle bridge arm, one end of the reverse series bridge arm II and one end of the reverse series bridge arm III , forming a T-shaped bridge arm; the reverse series bridge arm I, the reverse series bridge arm II, the reverse series bridge arm III, the intermediate bridge arm and the voltage dividing capacitor constitute a switched capacitor unit; the positive series bridge arm and the voltage dividing capacitor are connected in parallel; the forward series bridge arm The center point and the center point of the capacitor string serve as the AC voltage output end of the hybrid T-type multilevel inverter device. The invention effectively solves the technical problem of excessive voltage stress of the switch tube caused by the increase of the output voltage in the switched capacitor multi-level inverter, makes the invention suitable for high-voltage and high-power occasions, and expands the application range of the inverter.

Description

technical field [0001] The invention relates to the fields of electric energy conversion and new energy power generation, distributed grid-connected power generation and high-voltage large working conditions, and specifically relates to a hybrid T-type multi-level inverter device and a control method thereof. Background technique [0002] With the increasingly serious environmental pollution, the application of clean and renewable energy has attracted much attention, and research in the fields of photovoltaic power generation, wind power generation, and electric vehicles has gradually increased, and inverters, as the core of them, have also become the focus of research. Multi-level inverter technology overcomes the disadvantages of high output harmonic content and large voltage stress of traditional inverters, and is widely used in production and life. Traditional multilevel inverters mainly include diode clamp type, flying capacitor type and cascaded type. Among them, diod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 王要强库若含梁军王明东董亮辉陈根永袁艺森王昌龙
Owner ZHENGZHOU UNIV
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