Three-level converter, control method thereof and power supply system
A converter and three-level technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of complex system structure and high cost, and achieve the effect of simple system structure, low cost, and hardware cost saving
Pending Publication Date: 2022-01-14
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
In the prior art, a charging loop or a discharging loop can be added to the flying capacitor three-level chopper circuit, and the flying capacitor can be charged through the charging loop or discharged through the discharging loop, so that the flying capacitor The voltage is within the safe voltage range, but an external charging circuit or discharging circuit is required, the cost is too high, and the system structure is complicated
Method used
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[0044] The three-level converter provided by this application can be applied to the fields of new energy smart microgrid, power transmission and distribution, or new energy fields (such as photovoltaic grid-connected fields or wind power grid-connected fields), photovoltaic storage power generation fields (such as for household equipment ( Such as refrigerators, air conditioners) or grid power supply), or the field of wind storage power generation, or the field of high-power converters (such as converting direct current into high-power high-voltage alternating current) and other application fields, which can be determined according to actual application scenarios. No restrictions. The power supply system provided by this application can be adapted to different application scenarios, such as optical storage power supply application scenarios, wind storage power supply application scenarios, pure energy storage power supply application scenarios, or other application scenarios. T...
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The invention provides a three-level converter, a control method thereof and a power supply system. The three-level converter comprises a high-voltage side unit, a low-voltage side unit, a flying capacitor, first to fourth switches and a control unit. And when the voltage of the flying capacitor is not in a target voltage range (a safe voltage range), the control unit can control the third switch and the fourth switch to be normally switched off, and control each of the first switch and the second switch to be switched on or switched off based on the voltage of the flying capacitor and the voltage of the low-voltage side unit, so that the voltage of the flying capacitor is in the target voltage range. Or, the control unit can control the first switch and the second switch to be normally switched off, and control each of the third switch and the fourth switch to be switched on or switched off based on the voltage of the flying capacitor and the voltage of the low-voltage side unit, so that the voltage of the flying capacitor is in the target voltage range. Based on the application, the voltage of the flying capacitor is controlled within the target voltage range through different switching actions, and the system is simple in structure, low in cost and high in applicability.
Description
technical field [0001] The present application relates to the technical field of electronic power, and in particular to a three-level converter, a control method thereof, and a power supply system. Background technique [0002] At present, since the flying capacitor three-level chopper circuit has the advantages of increasing the switching frequency and reducing the volume and cost of the chopper inductor, it can be widely used in high input voltage and medium to high power application scenarios. Generally speaking, the flying capacitor three-level chopper circuit includes the power supply and the flying capacitor. In order to better reduce the higher harmonics in the output voltage of the circuit, it is necessary to control the voltage of the flying capacitor within the safe voltage range. . The safe voltage range here is a voltage range greater than (half intermediate DC voltage-offset value) and smaller than (half intermediate DC voltage+offset value), wherein the half i...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M3/04H02M3/07
CPCH02M3/04H02M3/07H02M3/158H02M1/0095H02M7/4837H02M7/4833H02J2300/24
Inventor 鞠华磊徐志武李琳
Owner HUAWEI DIGITAL POWER TECH CO LTD