Modeling and Current Control Method for LVPMM including Longitudinal End Effects

A speed tracking control method for induction machine is shown in this paper. The method consists of outer speed control loop and inner current control loop. Model predictive current control method without the need for calculation of the weighing factors is utilized for the inner control loop, which generates a continuous set of voltage reference values that can be modulated and applied by the inverter to the induction machine. Interesting parallels are drawn between the developed method and state feedback principles that helped with the analysis of the stability and controllability. Simple speed and rotor flux estimator is implemented that helps achieve sensorless control. Simulation is conducted and the method shows great performance for speed tracking in a steady state, and during transients as well. Additionally, compared to the finite control set predictive current control, it shows less harmonic content in the generated torque on the rotor shaft.

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Extended Permanent Magnet Synchronous Motors Speed Range Based on the Active and Reactive Power Control of Inverters

Energies ◽

10.3390/en14123549 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3549

Author(s):

Pham Quoc Khanh ◽

Viet-Anh Truong ◽

Ho Pham Huy Anh

Keyword(s):

Power Control ◽

Permanent Magnet ◽

Reactive Power ◽

Control Method ◽

Speed Control ◽

Torque Ripple ◽

Current Control ◽

Permanent Magnet Synchronous Motors ◽

Synchronous Motors ◽

Speed Range

The paper proposes a new speed control method to improve control quality and expand the Permanent Magnet Synchronous Motors speed range. The Permanent Magnet Synchronous Motors (PMSM) speed range enlarging is based on the newly proposed power control principle between two voltage sources instead of winding current control as the conventional Field Oriented Control method. The power management between the inverter and PMSM motor allows the Flux-Weakening obstacle to be overcome entirely, leading to a significant extension of the motor speed to a constant power range. Based on motor power control, a new control method is proposed and allows for efficiently reducing current and torque ripple caused by the imbalance between the power supply of the inverter and the power required through the desired stator current. The proposed method permits for not only an enhanced PMSM speed range, but also a robust stability in PMSM speed control. The simulation results have demonstrated the efficiency and stability of the proposed control method.

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Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

Energies ◽

10.3390/en14071951 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1951

Author(s):

Mihaela Popescu ◽

Alexandru Bitoleanu ◽

Mihaita Linca ◽

Constantin Vlad Suru

Keyword(s):

Power Quality ◽

Quality Indicators ◽

Reactive Power ◽

Control Method ◽

Active Power Filter ◽

Active Power ◽

Current Control ◽

Shunt Active Power Filter ◽

Power Filter ◽

Unbalanced Load

This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania. The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment). In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h. The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance. By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved. In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load. The performance associated with each objective of the compensation is presented and analyzed. The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution.

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Emulation of grid-forming inverters using real-time PC and 4-quadrant voltage amplifier

Forschung im Ingenieurwesen ◽

10.1007/s10010-021-00484-9 ◽

2021 ◽

Author(s):

Wolf Schulze ◽

Maurizio Zajadatz ◽

Michael Suriyah ◽

Thomas Leibfried

Keyword(s):

Real Time ◽

Control Method ◽

Current Control ◽

Control Methods ◽

Test Bed ◽

Test Scenario ◽

Power Semiconductors ◽

Voltage Amplifier ◽

Grid Side ◽

Virtual Synchronous Machine

AbstractA test bed for the evaluation of novel control methods of inverters for renewable power generation is presented. The behavior of grid-following and grid-forming control in a test scenario is studied and compared.Using a real-time capable control platform with a cycle time of 50 µs, control methods developed with Matlab/Simulink can be implemented. For simplicity, a three-phase 4‑quadrant voltage amplifier is used instead of an inverter. Thus, the use of modulation and switched power semiconductors can be avoided. In order to show a realistic behavior of a grid-side filter, passive components can be automatically connected as L‑, LC- or LCL-filter. The test bed has a nominal active power of 43.6 kW and a nominal voltage of 400 V.As state-of-the-art grid-following control method, a current control in the d/q-system is implemented in the test bed. A virtual synchronous machine, the Synchronverter, is used as grid-forming control method. In combination with a frequency-variable grid emulation, the behavior of both control methods is studied in the event of a load connection in an island grid environment.

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