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Inverter controller
| Details |
Inventors: Maekawa, Katsumi;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Ro; Bentsu
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
The inverter controller includes a deviation arithmetic circuit which calculates the deviation between the current command (reference) and the output current, a vector angle arithmetic circuit which calculates the deviation current vector angle on the basis of the deviation calculated by this deviation arithmetic circuit, and a switching sequence logic circuit which selects the switching signal on the basis of the deviation current vector angle calculated by the vector angle arithmetic circuit and its own switching signal being output or on the basis of the deviation current vector angle and its own switching signal and the switching signal output previously, and obtains an output current by controlling self-turn-off switching devices on the basis of the switching signal output by the switching sequence logic circuit. |
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DETAILED DESCRIPTION In consideration of the above problems, the object of the present invention is to provide inverter controllers which enable PWM signals capable of harmonic suppression and of rapid current control response to be obtained without back electromotive force vector position information and which enable PWM signals whose switching frequency does not fluctuate widely to be obtained.
Inverter output voltage vectors can be broadly divided into zero-voltage vectors and nonzero-voltage vectors.
Since the current during the outputting of a zero-voltage vector changes in accordance with the back electromotive force only, zero-voltage vectors cannot be used to control the change in direction of the current unless, as in the above method, there is no back electromotive force position information.
The change in direction of the current can be controlled using nonzero-voltage vectors only.
That is, if the current is controlled using nonzero-voltage vectors only, a large number of harmonic waves are generated, as in conventional hysteresis-band PWM.
Therefore, an appropriate balance must be struck between the use of zero-voltage vectors and of nonzero-voltage vectors.
If such current control can be achieved, in current control in a steady state in which the current deviation is sufficiently small, it should be possible to use nonzero-voltage vectors to compensate for current changes due to the back electromotive force during zero-voltage vector output.
In the present invention, current changes during zero-voltage vector output are determined using the current deviation itself.
Ideally the changeover to the zero-voltage vector should be made when the current deviation becomes zero, using nonzero-voltage vectors to control the current in such a way as to minimize the current deviation.
Current changes during zero-voltage vector output depend on the back electromotive force, so it is unclear as to how the current vector changes.
However, since the changeover to the zero-voltage vector is made when the current deviation becomes zero, the current deviation vector should certainly become larger
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