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A cascaded multi-level inverter circuit with crossed double PV source input

A multi-level inverter, cascaded multi-level technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input into AC power output, electrical components, etc., can solve poor stability, The structure is complex and cannot adapt to the reliability of new energy power generation systems such as wind power and photovoltaic power generation, and achieves the effects of increased power level, simple structure, and reduced total harmonic distortion

Active Publication Date: 2021-02-19
XI AN JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the multi-level inverters used in new energy applications such as wind power and photovoltaic power generation adopt a single topology module structure, which cannot adapt to the reliability of new energy power generation systems such as wind power and photovoltaic power generation. Requires additional capacitance circuit assistance, complex structure and poor stability

Method used

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  • A cascaded multi-level inverter circuit with crossed double PV source input
  • A cascaded multi-level inverter circuit with crossed double PV source input
  • A cascaded multi-level inverter circuit with crossed double PV source input

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Embodiment

[0032] Example: such as figure 1 As shown, the first DC power supply V dc1 For a level VDC output, the second DC power supply V dc2 It is 3 level outputs, that is, Vdc1=Vdc, Vdc2=3Vdc; the first switching tube Qa, the second switching tube Qb, the third switching tube Qc, the fourth switching tube Qd, the fifth switching tube Q1, and the sixth switching tube Q2, the seventh switching tube Q3, the eighth switching tube Q4 and the ninth switching tube Q5 form a 9-switch-9-level-crossover double PV source input non-isolated cascaded multi-level inverter circuit, two different PV Source (energy) access can be compatible with many different types of new energy, and at the same time, different new energy inputs can obtain different output levels. Two input DC power sources are connected to two different renewable energy sources, such as figure 2 Shown is the different switching modes of the multilevel inverter circuit and the output levels corresponding to the switching modes. ...

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Abstract

The invention discloses a crossover double PV source input cascaded multilevel inverter circuit. Nine switching tubes are connected to form a crossover double PV source input cascade multilevel inverter circuit topology without additional capacitors. It can be compatible with the simultaneous access of multiple new energy sources. Through the cascading of a single topology, high output voltage and output power can be obtained, and the total harmonic distortion will be significantly improved. It is suitable for the hybrid of multiple new energy power generation systems Use, simple structure. The cascade connection of multiple multi-level inverter circuits expands the number of output levels of the multi-level inverter circuit and the requirements of high-power applications. Under the cascade structure, the power level will be improved and the total harmonic Wave distortion will be significantly reduced, increasing the reliability of the system and reducing the number and volume of filter components.

Description

technical field [0001] The invention belongs to the field of power electronics research, and in particular relates to a cascaded multilevel inverter circuit with crossed double PV source input. Background technique [0002] In recent years, multilevel inverters (MLIs) have been favored by many scholars and have attracted extensive attention in the industrial field. [0003] The series of advantages of MLIs is due to its own characteristics: the reduction of total harmonic distortion (THD) brought about by multi-level operation and better electromagnetic compatibility characteristics, which in turn will affect the overall system , so that the efficiency and stability of the entire system are improved. At the same time, the multi-level operation of the multi-level inverter can reduce the stress on the switching device, thereby reducing the switching loss of the switching device and optimizing the overall efficiency characteristics. At present, the multi-level inverters used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/49
CPCH02M7/483H02M7/49H02M1/007Y02E10/56
Inventor 阿拉丁·穆斯塔法·穆罕默德·哈森李小腾周永兴陈文洁杨旭戴立宇王睿
Owner XI AN JIAOTONG UNIV
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