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An estimation method for sensorless control employing a test signal based reference model is presented. The method estimates the slip frequency by a comparison of the measured impedance curve while the machine is in operation with the reference model curves. The reference model is measured during DC magnetisation of a cold machine at steady state and constant rotor flux linkage. During normal machine...
This paper presents a comparison study between the operation of a back-to-back and a matrix converter induction motor drive under the presence of faults in the power switches of these converters. These two topologies are functionally equivalent in terms of input power quality and energy regeneration capabilities but need to be compared in terms of performance under faulty conditions as well due to...
The drive system of a variable speed pump-storage power station consisting of a doubly-fed induction machine with a 3-level voltage source inverter feeding the rotor is presented. The advantages of variable speed pump-storage power stations are outlined. After a short comparison with the classical cyclo-converter solution the voltage source inverter solution is described in detail covering various...
In the design of induction motor adjustable-speed drives, the same efficiency and performance requirements can be achieved with different choices as far as the motor and the inverter individual size is concerned. Depending on the specific functions that relate motor and inverter size to their respective cost, each choice is expected to result in a different overall drive cost. This paper presents...
Field oriented control doesn't correspond to features of synchronous motor as good as it does to induction motor. Special control algorithm is proposed to provide operation, suitable for mass high-power drives. The solution is implemented and tested in two fan drives, 3.15 MW each, now in operation at a diamond mine in North-East Siberia.
Operating single phase induction motors across a wide range of speed and load with high efficiency is still of interest. In the paper at hand the suitability of several different capacitor run single phase induction machines for phase control, integral (half) cycle control or integral switched cycle control is investigated. The induction machine's model's electrical and mechanical parameters are estimated...
Investigation of conducted electromagnetic interference (EMI) in AC motor drives fed by a pulse width modulated (PWM) voltage converters requires that converters', motor windings' and feeding cables' parasitic capacitances have to be taken into account. Motor voltage transients and related EMI emission are substantially correlated with resonance effects occurring in load circuits. Frequency impedance...
Incipient fault detection and isolation (FDI) in the current sensors of a controlled induction motor is addressed by an original diagnosis system based exclusively on the three-phase signals model. In this way we avoid a reduction in the performance of the FDI system due to the uncertainty in the machine model. Assuming that the three current signals are measured, the proposed FDI system is made of...
Fast switching of PWM-inverters cause a lot of electromagnetic interference (EMI). To lower the dv/dt, output filters are available. In this paper, the influence of the cable and the output filters on conducted emission is investigated. By combining impedance measurements and EMI-measurements particular dips in the spectrum can be explained.
The paper presents a model of a poly-phase permanent magnet motor of the marine propulsion drive energized by multistage VSI. The model defines more precisely the non-sinusoidal waveform of back-EMF and its impact on the current distortion and electromagnetic torque ripples. The paper concludes by analyzing simulation results that have shown significant suppression of high order current harmonics...
Undesired low-frequency self-sustained speed oscillations are encountered in fan, compressor and pump drives utilizing open-loop frequency-controlled induction motor drives. Discontinuous rectifier current at light loads and the dead-time of the inverter switches are the main sources of such oscillations. This paper proposes a concise analytical method to predict the risk of self-sustained oscillations...
This paper describes harmonic detection methods used in industrial shunt active filters, designed for adjustable speed drive applications. The methods are based on overall - broadband and selective harmonic detection technique. All methods are described and analyzed in the paper together with several practical design steps. The methods are compared in the case of voltage unbalance and pre distortion,...
This paper presents a new diagnostic technique, known as the modulated error voltages (MEV), for the diagnosis of open-circuits faults in the power switches of matrix converters. The proposed technique is based on the monitoring of nine modulated output error voltages, each one associated to a bidirectional switch of the converter. For each output phase, an error voltage is calculated and subsequently...
This paper presents real-time simulation results of a permanent magnet synchronous machine (PMSM) drive in faulty and non-standard modes and validates these against an actual industrial PMSM drive system. The paper will put emphasis on the test of special and faulty modes in PMSM drives. Results of real-time simulation of a PMSM drive with an open phase and in passive mode (with all IGBTs switched...
The main result presented in this paper is the implementation of optimal control based on quadratic criteria into a low power electric drive with three-phase induction motor. The dSPACE 1104 controller has been used in order to obtain the on-line optimal solution of matrix Riccati differential equation (MRDE). Based on the optimal solution and on corresponding feedback signals, the optimal speed reference...
A model predictive DTC algorithm used for the Lyapunov stability function based DTC of induction motor control is presented in the paper. It is proposed as an alternative to the classical approaches based on the look-up tables, where the contribution of electromotive force is not considered. An appropriate Lyapunov function is chosen and, based on its derivative, optimal stator voltage vector is determined...
This paper presents a 1.5-kW, 150,000-r/min PM motor fed by a 12-V power supply, which is applicable to an automotive supercharger. The motor is specially designed to improve its efficiency over 97% (excluding a mechanical loss) and to raise its power density to 13 W/cm3 at the same time. Feasibility of the design is confirmed through experimental tests, using a prototype motor.
In this paper some different control strategies, suitable for open-phase fault operation of seven-phase current regulated induction motor drives, are presented. These strategies, which are valid in steady-state as well as in transient operating conditions, are compared in terms of stator and rotor copper losses and torque pulsations. The comparison is carried out by means of an opportune mathematical...
The paper presents the speed sensorless control of the induction motor in the system with the voltage inverter and LC filter. The LC filter is used to smooth the motor currents and voltages. In the control system the non-linear control method is used. For the state variables estimation the disturbance observer is implemented. Because of the voltage drop and phase shift caused by the LC filter the...
This paper presents the design, analysis and comparison of the conventional PI-control to two state space controllers for speed control of drive systems with elastically coupled loads. A state space controller of fourth order which considers only the mechanical system and a state space controller of fifth order which takes an approximation of the electrical system into account are analyzed. Thereby,...
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