Energy feedback power unit
A technology of power unit and energy feedback, which is applied in the direction of output power conversion device, conversion of AC power input to AC power output, conversion of AC power input to DC power output, etc. Complicated structure and other problems, to achieve good promotion and application prospects, reduce harmonic pollution, and simple device structure
Active Publication Date: 2013-02-13
北京合康新能变频技术有限公司
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Problems solved by technology
This not only wastes electric energy in vain, but also complicates the structure.
[0005] For applications that require lowering heavy objects or emergency shutdown, the power unit series multilevel high-voltage inverter requires that the power unit should have energy feedback function. However, the application of this energy feedback working method in the high-voltage field is very complicated. How to It is a technical difficulty that has plagued technicians in the industry for many years to feed back electric energy into the power grid without or little impact on the power supply quality of the power grid; especially for power unit series multi-level high-voltage inverters, it uses low-voltage power The high-voltage output is realized by connecting the units in series, and at the same time, the phase-shifting function of the transformer is used to realize a perfect harmonic-free high-voltage inverter on the input side. It is more difficult for this kind of high-voltage inverter to realize the energy feedback function, and there has been no good technology so far. solution
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[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.
[0026] Referring to Figure 3, the composition structure of the control circuit of the energy feedback power unit of the present invention is introduced: a filter circuit composed of a three-phase capacitor and a three-phase reactor connected in sequence 1, a three-phase synchronous rectifier bridge composed of an insulated gate bipolar transistor IGBT 2. The DC filter circuit 3 composed of capacitors, the unit inverter bridge 4 composed of IGBTs, and the synchronous rectification control circuit 5 and the unit inverter which control the working states of the three-phase synchronous rectifier bridge 2 and the unit inverter bridge 4 respectively Variable control circuit 6; two of the control circuits 5 and 6 are the key to the innovation of the device of the present ...
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An energy feedback power unit, the control circuit of which includes a filter circuit composed of three-phase capacitors and three-phase reactors, a three-phase synchronous rectifying bridge composed with IGBT, a DC filter circuit composed with capacitors, a unit invert bridge composed with IGBT, and a synchronous rectifying control circuit and a unit invert control circuit, which control the operation conditions of the three-phase synchronous rectifying bridge and the unit invert bridge.
Description
Technical field [0001] The invention relates to the main components of a high-voltage frequency converter, specifically, to an energy feedback power unit used for a series-connected power unit high-voltage frequency converter with four-quadrant operation capability; it belongs to the technical field of power electronic equipment. Background technique [0002] The frequency converter is an electric energy conversion device with adjustable frequency by using the turn-on and turn-off effects of semiconductor power devices. The device first converts the electrical energy of the AC power supply into direct current, and then converts the direct current into alternating current with variable frequency to drive the load. With the rapid development of microelectronics and power electronics technology, as a product of the development of power electronics technology in the 21st century, high-voltage inverters have been used in many areas of the national economy (such as thermal power genera...
Claims
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IPC IPC(8): H02M5/44H02M7/525G05F1/66
CPCH02M5/4585
Inventor 杜心林
Owner 北京合康新能变频技术有限公司