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Vector optimizing control for medium-voltage high-power three-level DC-to-AC inverter

A three-level inverter and vector optimization technology, applied in the field of power transformation, can solve the problems of reducing harmonic content, etc., and achieve the effects of improving reliability, reliable operation, and avoiding damage

Inactive Publication Date: 2005-02-23
TONGJI UNIV
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Problems solved by technology

[0003] The present invention aims to provide a vector optimization control method for a medium-voltage high-power three-level inverter device, which solves the problem of smooth transition of the output voltage of the inverter during PWM modulation switching, reduces harmonic content, and avoids excessive load on switching devices. Damaged by stress, technical issues to improve the reliability of its operation

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  • Vector optimizing control for medium-voltage high-power three-level DC-to-AC inverter
  • Vector optimizing control for medium-voltage high-power three-level DC-to-AC inverter
  • Vector optimizing control for medium-voltage high-power three-level DC-to-AC inverter

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Embodiment Construction

[0032] The switch of each phase of the three-level inverter has three states -1, 0, and 1, and the AC side output voltages corresponding to these three states are -E, O, E (that is, negative voltage N, zero voltage O, positive voltage P), for a three-phase symmetrical system, a total of 27 switch state combinations can be combined, and each switch state combination corresponds to a space voltage vector, so there are 27 switch state combinations for a symmetrical three-level inverter different space voltage vectors, among them, the large vector with the magnitude of 2 / 3E has V PNN , V PPN , V NPN , V NPP , V NNP , V PNP Six, the medium vector with amplitude 1 / 3E has V PON , V OPN , V NPO , V NOP , V ONP , V PNO Six P-type small vectors with an amplitude of 1 / 3E have V POO , V PPO , V OPO , V OPP , V OOP , V POP Six N-type small vectors with an amplitude of 1 / 3E have V ONN , V OON , V NON , V NOO , V NNO , V ONO Six, zero vectors with magnitude 0 have V PP...

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Abstract

In this method, the space voltage vector of the alternate current output voltage of the inverter, according to its valve in the Alpha, Beta coordinate system, is arranged into the vector distribution map of a hexagon, which is combined by 24 equilateral triangle and the corresponding status of the switch, the optimization modulation is processed. The optimization allows only one switch change status when the adjacent switches switch over.

Description

Technical field: [0001] The invention relates to power transformation, in particular to a control method for a three-level inverter. Background technique: [0002] In recent years, with the expansion of the use of electric energy in various fields, the scope of use of high-power three-level inverters has gradually expanded. How to control the reliable operation of the inverter is also becoming more and more important. At present, most of the known control methods for multi-level inverters modulated by PWM are to control the voltage fluctuation of the neutral point of the inverter. For example, ZL96199540.8 Chinese invention patent discloses a method to control the neutral Point voltage, in addition to the voltage control device, it is necessary to set up a correction device to control the voltage of the neutral point with the deviation signal detected by the neutral point voltage point. This method of controlling the neutral point voltage fluctuation of the inverter by usi...

Claims

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Application Information

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Inventor 李海山葛琼璇李耀华王晓新张树田
Owner TONGJI UNIV
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