A novel indirect current control for single-phase PWM rectifier at low switching frequency

2010 ◽  
Author(s):  
Shengfang Fan ◽  
Wencai Zhao ◽  
Liqun He ◽  
Kai Zhang
Keyword(s):  
Single Phase ◽  
Current Control ◽  
Switching Frequency ◽  
Pwm Rectifier ◽  
Indirect Current Control

scholarly journals Model Predictive Current Control with Fixed Switching Frequency and Dead-Time Compensation for Single-Phase PWM Rectifier

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 426 ◽  
Author(s):  
Longyun Kang ◽  
Jianbin Zhang ◽  
Hailan Zhou ◽  
Zixian Zhao ◽  
Xinwei Duan
Keyword(s):  
Single Phase ◽  
Dead Time ◽  
Prediction Equation ◽  
Current Control ◽  
Switching Frequency ◽  
Pwm Rectifier ◽  
Action Time ◽  
Optimal Action ◽  
The Dead ◽  
Dead Time Compensation

The research object of this paper is single-phase PWM rectifier, the purpose is to reduce the total harmonic distortion (THD) of the grid-side current. A model predictive current control (MPCC) with fixed switching frequency and dead-time compensation is proposed. First, a combination of an effective vector and two zero vectors is used to fix the switching frequency, and a current prediction equation based on the effective vector’s optimal action time is derived. The optimal action time is resolved from the cost function. Furthermore, in order to perfect the established prediction model and suppress the current waveform distortion as a consequence of the dead-time effect, the dead-time’s influence on the switching vector’s action time is analyzed, and the current prediction equation is revised. According to the experimental results, the conclusion is that, firstly, compared with finite-control-set model predictive control, proportional-integral-based instantaneous current control (PI-ICC) scheme and model predictive direct power control (MP-DPC), the proposed MPCC has the lowest current THD. In addition, the proposed MPCC has a shorter execution time than MP-DPC and has fewer adjusted parameters than PI-ICC. In addition, the dead-time compensation scheme successfully suppresses the zero-current clamping effects, and reduce the current THD.

scholarly journals Improved Model Predictive Current Control of Single-Phase Five-Level PWM Rectifier

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2214
Author(s):  
Yifeng Zhu ◽  
Hao Yue ◽  
Hailong Zhao ◽  
Huichun Xu
Keyword(s):  
Model Predictive Control ◽  
Objective Function ◽  
Predictive Control ◽  
Single Phase ◽  
Current Control ◽  
Current Loop ◽  
Switching Frequency ◽  
Two Phase ◽  
Small Current ◽  
Improved Model

In this paper, a single-phase five-level rectifier with coupled inductors is studied. First, a discrete mathematical model of a single-phase five-level rectifier is created in two-phase(αβ). A traditional single vector finite control set model predictive control (FCS-MPC) algorithm is improved to overcome the problems of a varying switching frequency, the large amount of time needed for calculation, and the inaccurate setpoint of current loop tracking. Then, the objective function of the system is established, and a simple objective function is used instead of an iterative optimization of the traditional FCS-MPC algorithm. At the same time, to eliminate the delay error and to reduce harmonic distortion, deadbeat control technology is introduced. Finally, the simulation and experimental results show that the improved model predictive current control algorithm not only retains the fast response of traditional model predictive control, but also has the advantages of fixed switching frequency, small calculation time, and small current steady-state error.

Improvement in Dynamic Performance of Indirect Current Control Strategy on Three Phase PWM Rectifier

2012 ◽  
Vol 433-440 ◽  
pp. 7281-7286
Author(s):  
Xiao Chen Wang ◽  
Jiang Ming Yang ◽  
Hong Mei Li ◽  
Feng Xiang Sun
Keyword(s):  
Low Cost ◽  
Dynamic Performance ◽  
Current Control ◽  
Voltage Source ◽  
Computer Simulation Model ◽  
Current Response ◽  
Pwm Rectifier ◽  
Three Phase ◽  
In Series ◽  
Indirect Current Control

Three phase voltage source PWM rectifier (VSR)’s indirect current control (ICC) strategy has good static performance, simple control steps and low cost. But bad dynamic performance is its inherent drawback. If this weakness is overcome, it is still valued. In this article normal ICC is deeply studied beginning with its mathematical model under synchronous rotating coordinate. It is indicated that its bad dynamic performance originates from bad current response. So an improving scheme adding compensation in series is brought out. Additionally a differential negative feedback loop of DC output voltage is added to limit the voltage overshoot. Lastly the control system’s computer simulation model is established by MATLAB and the simulating results prove that improved ICC makes great process in dynamic performance and has advantages of both indirect and direct current control (DCC).

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