Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1984-03-15
1985-11-26
Beha, Jr., William H.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363163, 363164, 318803, 318807, H02P 1330
Patent
active
045557551
ABSTRACT:
In an AC current control system for controlling multi-phase AC currents supplied from a power converter to a load, the currents are detected and coordinate-transformed into orthogonal two-axis current values i.sub.d, i.sub.q in a rotating coordinate rotating at an angular frequency .omega., and then compared with the references. The deviations are used to determine two-axis voltage values e.sub.d *, e.sub.q *, which are coordinate-transformed into multi-phase voltage values determining the output voltages of the power converter. The system is characterized in that the voltage value e.sub.d * is determined not only from .DELTA.i.sub.d but also from the product of .omega. and .DELTA.i.sub.q, while the voltage value e.sub.q * is determined not only from .DELTA.i.sub.q but also from the product of .omega. and .DELTA.i.sub.d. This arrangement makes it possible to provide a voltage component corresponding to the voltage drop across the inductive component of the load which is 90.degree. in advance of the current.
REFERENCES:
patent: 4074348 (1978-02-01), Salzmann et al.
patent: 4488215 (1984-12-01), Pfaff et al.
C. D. Schauder et al, "Current Control of Voltage Source Inverters for Fast Four-Quadrant Drive Performance", IEEE IAS Annual Meeting, IAS 81:26A, pp. 592-599, (Oct. 1981).
Kurosawa Ryoichi
Shimamura Takeo
Beha Jr. William H.
Sterrett Jeffrey
Tokyo Shibaura Denki Kabushiki Kaisha
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