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Three-phase Boost integrated boost inverter and hybrid modulation method thereof

A hybrid modulation, integrated technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as reducing reliability, increasing system switching losses and costs, and large voltage stress of inverters, and achieving output voltage Small THD, high voltage gain, small boost inductance

Inactive Publication Date: 2019-02-01
NANTONG UNIVERSITY
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Problems solved by technology

The second is a single-stage structure that only uses a three-phase voltage type full-bridge inverter
However, it requires a large number of photovoltaic cells to be connected in series, so that the input voltage of the inverter under the worst working condition (that is, the highest temperatur

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  • Three-phase Boost integrated boost inverter and hybrid modulation method thereof
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  • Three-phase Boost integrated boost inverter and hybrid modulation method thereof

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[0033] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0034] like figure 1 A three-phase Boost integrated boost inverter is shown, including a DC power supply U in , boost filter capacitor C in , anti-reverse diode D 1 -D 3 , boost inductor L 1 , switch tube S 1 -S 6 , filter inductance L o1 -L o3 , filter capacitor C o1 -C o3 and load resistor R. The DC power supply U in The positive pole of the boost inductor L 1 connected at one end, the boost inductor L 1 The other ends are connected with anti-reverse diodes D 1 , anti-reverse diode D 2 , anti-reverse diode D 3 the anode of the anti-reverse diode D 1 The cathodes are respectively connected to the switching tube S 1 , switch tube S 2 , filter inductance L o1 One end; the anti-reverse diode D 2 The cathodes are respectively connected to the switching tube S 3 , switch tube S 4 , filter inductance L o2 One end; the ...

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Abstract

The invention discloses a three-phase Boost integrated boost inverter and a hybrid modulation method thereof. The boost inverter includes a DC power supply Uin, a boost filter capacitor Cin, anti-reverse diodes D1-D3, a boost inductor L1, switches S1-S6, filter inductors Lo1-Lo3, filter capacitors Co1-Co3 and a load resistor R. The specific modulation method adopts a three-phase hybrid SPWM modulation method comprising three driving signals of SBoost, SSPWM and Tn. The three driving signals are input into a logic operation circuit, and finally the output control of each switching tube is performed, wherein SBoost is used to control a DC bus voltage, SSPWM is used to control the inversion of an inverter, and Tn is an interval decision signal. The inverter of the invention integrates a Boostconverter and a three-phase voltage type full-bridge inverter, and has the advantages of high voltage gain, small output voltage THD, and small boosting inductance.

Description

technical field [0001] The invention relates to an inverter in the technical field of power electronic converters, in particular to a three-phase Boost integrated boost inverter and a hybrid modulation method thereof. Background technique [0002] Photovoltaic grid-connected power generation is one of the main forms of solar energy utilization. The output voltage of photovoltaic array fluctuates in a wide range due to the influence of light and temperature. In order to ensure reliable inverter, three-phase photovoltaic grid-connected power generation systems usually adopt two structural forms. The first is a two-stage structure in which Boost converters are cascaded with three-phase voltage-type full-bridge inverters. The second is a single-stage structure that only uses a three-phase voltage-type full-bridge inverter. The former has the advantage of lower voltage stress on the inverter and less switching losses. However, the overall efficiency of the two-stage structure...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/5395H02M3/155H02M1/12
CPCH02M7/53871H02M1/12H02M3/155H02M7/5395
Inventor 尹铭秦岭胡茂罗松高娟沈家鹏田民程飞跃周磊段冰莹
Owner NANTONG UNIVERSITY
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