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This paper discusses the effect of current measurement error in angle estimation of permanent magnet AC motor for position sensorless control based on motor back EMF. The current measurement errors due to non-ideal elements in the system are classified into the scaling error, the offset error, and the discretization error. Those errors have been represented in the estimated synchronous reference frame...
This paper discusses operating characteristics of a permanent magnet synchronous motor (PMSM) drive system based on direct torque control (DTC). In this system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector (called M-T frame). The stator flux estimation is also based on a PMSM model in the M-T frame, and thus, this is expected...
Rotor time constant is a key parameter in an induction motor drive with indirect field oriented control. In this paper, a modified Model Reference Adaptive Controller (MRAC) utilizing d-axis stator voltage is proposed for online updating of rotor time constant. Compared with the traditional d-axis voltage model, the information of torque current and stator frequency is incorporated into the adaptive...
A novel approach to estimate rotor position of a dual three-phase permanent magnet synchronous motor (PMSM) at low speed is investigated in this paper. A position estimation algorithm is developed in two dimensional nature static frame. Proposed algorithm exploits the transient response of line currents, which are integrated within fundamental PWM cycle to estimate rotor position and speed. For successful...
The present paper deals with the sensorless harmonic speed control of a drive for repetitive mechanical systems and proposes a harmonic control scheme, in which a proportional-integral controller is dedicated to each single harmonic component of the speed error. In addition, the harmonic speed controller provides information that can be used for the estimation of the load torque and for a diagnostic...
In modern design of power electronic converters, reliability of DC-link capacitors is an essential aspect to be considered. The industrial field have been attracted to the monitoring of their health condition and the estimation of their ageing process status. The existing condition monitoring methods suffer from shortcomings such as, low estimation accuracy, extra hardware, and increased cost. Therefore,...
This paper improves the permanent magnet (PM) machine position sensorless drive specifically for high speed operation. To obtain the rotor position, an approximation is typically assumed on the position estimator where the estimated position is almost equal to the actual position per sample instant. This small signal approximation might not be valid at high speed when the ratio of sampling frequency...
This paper presents a mitigation strategy to reduce the risk of Subsynchronous Controller Interaction (SSCI) in Doubly-Fed Induction Generator (DFIG) based wind farms. SSCI mitigation is achieved through the modification of the controller structure within the DFIG turbine. A proportional damping controller tuned to the SSCI oscillatory frequency is proposed and implemented in the current controller...
This paper proposes an adaptive mixed game control algorithm to realize optimal load planning in cell sites forming a microgrid powered by renewable sources. Cell site controllers use renewable sources power generation and local load predictions to plan future coordinated load management, renewable power generation and local energy storage. Mixed game methods have been proved to offer an adequate...
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