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Cross dual PV source input cascaded multilevel inverter circuit

A cascaded multi-level, inverter technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input converting to AC power output, photovoltaic power generation, etc., can solve the problem of wind power generation and photovoltaic power generation. Reliability, complex structure and poor stability of new energy power generation systems such as power generation, to achieve the effects of simple structure, improved power level, high output voltage and output power

Active Publication Date: 2020-08-14
XI AN JIAOTONG UNIV +2
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  • 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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  • Cross dual PV source input cascaded multilevel inverter circuit
  • Cross dual PV source input cascaded multilevel inverter circuit
  • Cross dual PV source input cascaded multilevel inverter circuit

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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 cross double PV source input cascade multilevel inverter circuit. Nine switching tubes are connected to form a cross double PV source input cascade multilevel inverter circuit topological structure, no extra capacitor is needed, simultaneous access of multiple new energy sources can be compatible, high output voltage and output power can be obtained through cascading of asingle topological structure, total harmonic distortion can be obviously improved, and the system is suitable for mixed use of multiple new energy source power generation systems and is simple in structure. A plurality of multi-level inverter circuits are cascaded, so that the number of output levels of the multi-level inverter circuits is increased, the requirements of high-power application occasions are met, the power level is improved, the total harmonic distortion is remarkably reduced, the reliability of the system is improved, and the number and the size of filtering elements are reduced under a cascaded structure.

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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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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