Abstract
The paper considers the design of control system for variable-frequency synchronous drive with vector torque control. Such drives are used in units with enough wide speed range and shock loading, for example, hot and cold rolling mills. Two coordinates generate the torque of the systems under consideration: current and flux linkage of the stator. This paper provides parameter calculation for the observer of flux linkage state of the stator of synchronous motor with damper windings. The system is implemented based on the Luenberger observer with error-feedback. Flux linkage is determined within the orthogonal coordinate system d , q rotating synchronously with the rotor. The complex of a synchronous exited motor and state observer has been modeled. Modeling results demonstrate that a fractional error of flux linkage generation does not exceed 0.15 %.
Highlights
Variable frequency synchronous motors (SM) with the vector control of electromagnetic torque are used at main electric drives of the rolling mills [1,2,3]
As vector control implies operation in coordinates oriented according to one of the magnetic flux linkage, the SM control system may be designed on the orthogonal coordinate axes of the stator (α, β) or rotor (d, q)
Observer of magnetic field state of synchronous motor stator The authors of this paper offer description of state observer of magnetic flux linkage of the stator of synchronous motor based on the Luenberger observer with error-feedback
Summary
Variable frequency synchronous motors (SM) with the vector control of electromagnetic torque are used at main electric drives of the rolling mills [1,2,3]. Switching to a new coordinate system helps preventing consumption of reactive power in the synchronous machine by means of excitation field control Against this background, the stator currentbeing orthogonal to the flux linkage ψ coincides with the stator voltage vector. Strict dynamic requirements to electric drives of the rolling mills cannot be met without quick-response feedbacks according to coordinates unavailable for direct measuring Under these conditions, the use of state observer appears to be rather promising, because it provides estimate of unknown value according to the known motor coordinates (current, voltage and rotation rate). When designing a sensorless observer, the value of angular rate of the rotor is calculated with mathematical method; the equation of dynamic AM equilibrium based on the stator voltage is used together with (3): Usα=. The rotor rotation rate is supposed to be a known measurable value; the state observer is believed to be tolerant to its change
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