Reactive Current Control Strategy of CHB-DSTATCOM Based on Unit Vector

This article presents a control strategy that enables both islanded and grid-tied operations of a three-phase inverter in distributed generation. This distributed generation (DG) is based on a dramatically evolved direct current (DC) source. A unified control strategy is introduced to operate the interface in either the isolated or grid-connected modes. The proposed control system is based on the instantaneous tracking of the active power flow in order to achieve current control in the grid-connected mode and retain the stability of the frequency using phase-locked loop (PLL) circuits at the point of common coupling (PCC), in addition to managing the reactive power supplied to the grid. On the other side, the proposed control system is also based on the instantaneous tracking of the voltage to achieve the voltage control in the standalone mode and retain the stability of the frequency by using another circuit including a special equation (wt = 2πft, f = 50 Hz). This utilization provides the ability to obtain voltage stability across the critical load. One benefit of the proposed control strategy is that the design of the controller remains unconverted for other operating conditions. The simulation results are added to evaluate the performance of the proposed control technology using a different method; the first method used basic proportional integration (PI) controllers, and the second method used adaptive proportional integration (PI) controllers, i.e., an Artificial Neural Network (ANN).

Download Full-text

Simplified model predictive current control strategy for dual five-phase VSI-fed open end load to eliminate common-mode voltage and reduce current harmonics

Journal of Power Electronics ◽

10.1007/s43236-021-00266-0 ◽

2021 ◽

Author(s):

Huu-Cong Vu ◽

Hong-Hee Lee

Keyword(s):

Control Strategy ◽

Current Control ◽

Simplified Model ◽

Common Mode ◽

Current Harmonics ◽

Common Mode Voltage

Download Full-text

A Control Method for IPMSM Based on Active Disturbance Rejection Control and Model Predictive Control

Mathematics ◽

10.3390/math9070760 ◽

2021 ◽

Vol 9 (7) ◽

pp. 760

Author(s):

Fang Liu ◽

Haotian Li ◽

Ling Liu ◽

Runmin Zou ◽

Kangzhi Liu

Keyword(s):

Model Predictive Control ◽

Predictive Control ◽

Duty Cycle ◽

Control Strategy ◽

Disturbance Rejection ◽

Torque Ripple ◽

Current Control ◽

Active Disturbance Rejection Control ◽

Active Disturbance Rejection ◽

Disturbance Rejection Control

In this paper, the speed tracking problem of the interior permanent magnet synchronous motor (IPMSM) of an electric vehicle is studied. A cascade speed control strategy based on active disturbance rejection control (ADRC) and a current control strategy based on improved duty cycle finite control set model predictive control (FCSMPC) are proposed, both of which can reduce torque ripple and current ripple as well as the computational burden. First of all, in the linearization process, some nonlinear terms are added into the control signal for voltage compensation, which can reduce the order of the prediction model. Then, the dq-axis currents are selected by maximum torque per ampere (MTPA). Six virtual vectors are employed to FCSMPC, and a novel way to calculate the duty cycle is adopted. Finally, the simulation results show the validity and superiority of the proposed method.

Download Full-text