Three phase boost type three level inverter
A three-level inverter and step-up technology, which is applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of high voltage stress, large loss and limited application of switching tubes And other issues
Active Publication Date: 2015-05-06
河北申科电力股份有限公司 +5
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Problems solved by technology
However, the inverter scheme proposed in this application is a two-level inverter, which limits its application in medium and high voltage applications
In the article A novel three-phase single-stage distributed power inverter published by IEEE Transactions on Power Electronics in 2004, Carlo Cecati et al proposed a three-phase single-stage inverter based on Boost DC converter. The inverter output The voltage amplitude is greater than or equal to the input DC voltage amplitude and has good common-mode rejection capability; however, this inverter is a two-level inverter, and in the case of high-voltage power conversion, there are high voltage stresses on the switch tubes and output voltage harmonics. Defects such as high wave content and large loss
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[0041] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0042] figure 1Shown is the first circuit form of a three-phase step-up three-level inverter proposed by the present invention, from figure 1 It can be seen that the circuit form is composed of a DC bus, twelve switch tubes, six diodes, three inductors and six capacitors;
[0043] The P terminal of the DC bus passes through the first inductor L 1 with the second switch S 2 One end of the third switch tube S 3 connected to one end of the second switching tube S 2 The other end of the first switch tube S 1 One end of the first diode D 1 connected to one end of the third switching tube S 3 The other end of the fourth switch tube S 4 One end of the second diode D 2 connected to one end of the fourth switching tube S 4 The other end of is connected to the N end of the DC bus, and the first switching tube S 1 The ot...
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The invention discloses a three phase boost type three level inverter. The three phase boost type three level inverter is characterized in that a circuit type of the three phase three phase boost type three level inverter comprises a direct current bus, a switch tube, a diode, an electric inductor and a capacitor. The three phase boost type three level inverter has the advantages of being used in a buck-boost type occasion under the circumstance that a transformer or a forestage direct current convertor is not needed, small in size, high in efficiency, low in cost, capable of achieving the purpose that amplitude of output voltage is larger than or less than amplitude of input voltage, and high in maximum direct current voltage utilization ratio, needing low direct current bus voltage under the circumstance of meeting the same three phase load or the same three phase grid demands as a traditional boost type inverter, having common mode rejection ability, and being suitable for a middle and high voltage occasion due to the fact that voltage stress of the switch tube is one half of the traditional boost type inverter such as a three phase boost inverter.
Description
technical field [0001] The invention relates to an inverter in the technical field of power electronic converters, in particular to a three-phase step-up three-level inverter. Background technique [0002] As a kind of power electronic equipment, the basic function of the inverter is to convert the DC input power into AC power to meet the load requirements of the load or the grid. Among them, single-phase inverters are mainly used in small and medium power occasions, with simple structure and low cost; and three-phase inverters are suitable for higher power occasions due to their structural characteristics, and are widely used in photovoltaic grid-connected, motor drives, and aviation power supplies. And other industrial occasions. [0003] Traditional three-phase inverters mainly include three-phase half-bridge two-level inverter topologies, three-phase midpoint clamp three-level inverters and other topologies, and their common characteristics are that the output voltage a...
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Login to View More IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/123
Inventor 郭小强李建贾晓瑜卢志刚
Owner 河北申科电力股份有限公司