High-voltage frequency converter, output voltage detection method and device thereof and storage medium
An output voltage detection, high-voltage inverter technology, applied in the inverter field, can solve problems such as the inability to meet high-precision requirements, and achieve the effect of meeting high-precision requirements and achieving accurate acquisition.
Pending Publication Date: 2022-06-07
北京合康新能变频技术有限公司
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Problems solved by technology
However, sampling the output voltage using high-voltage resistor voltage division or current limiting methods cannot meet the high-precision requirements
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[0035]The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.
[0036] In the embodiment of the present invention, each phase bridge arm of the high-voltage frequency converter is composed of a plurality of H bridges in cascade.
[0037] Specifically, figure 2 It is a schematic diagram of the structure of a three-phase high-voltage inverter. refer to figure 2 As shown, the three-phase high-voltage inverter includes a U-phase bridge arm, a V-phase bridge arm and a W-phase bridge arm. The same, the specific number can be set according to actual nee...
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The invention discloses a high-voltage frequency converter, an output voltage detection method and device thereof and a storage medium, each phase of bridge arm of the high-voltage frequency converter is formed by cascading a plurality of H bridges, and the method comprises the following steps: obtaining the bus voltage of each H bridge and the three-phase current of the high-voltage frequency converter, and determining the voltage instruction of each H bridge; determining a current direction according to the three-phase current, and determining a bridge arm switching state of each H bridge according to the voltage instruction; and determining the output voltage of each H bridge according to the bus voltage, the current direction and the bridge arm switching state, and determining the output voltage of each phase of the high-voltage frequency converter according to the output voltage of each H bridge. According to the method, the real-time output voltage of the cascaded high-voltage frequency converter can be calculated, and the output voltage of the high-voltage frequency converter can be accurately obtained.
Description
technical field [0001] The present invention relates to the technical field of frequency converters, and in particular, to a high-voltage frequency converter and an output voltage detection method, device and storage medium thereof. Background technique [0002] Usually, the output voltage sampling of the high-voltage frequency converter is realized by adopting methods such as high-voltage resistor voltage divider to collect voltage or high-voltage resistor to limit current to collect current. like figure 1 As shown, for the U-phase output voltage of the high-voltage inverter, high-voltage resistors Rux, Ru(x-1), ..., Ru1 are used to divide the voltage, and the voltage at point A is collected to obtain the sampling voltage of the U-phase output voltage; The V-phase output voltage of the inverter is divided by high-voltage resistors Rvx, Rv(x-1), ..., Rv1, and the voltage at point B is collected to obtain the sampling voltage of the V-phase output voltage; for the W-phase ou...
Claims
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Login to View More IPC IPC(8): H02M5/458H02M1/088
CPCH02M5/4585H02M1/088Y02E10/56
Inventor 赵跃东武炳林丁峰杨凤山
Owner 北京合康新能变频技术有限公司