Control Method for a Matrix Converter to Ensure Compatibility between Filter Resonance Suppression and Output Current Control Performance

2015 ◽  
Vol 135 (7) ◽  
pp. 802-815
Author(s):  
Hiroki Takahashi ◽  
Jun-ichi Itoh
Keyword(s):  
Control Method ◽  
Matrix Converter ◽  
Current Control ◽  
Control Performance ◽  
Output Current

scholarly journals Decentralized Control Method of ISOP Converter for Input Voltage Sharing and Output Current Sharing in Current Control Loop

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1114
Author(s):  
Sung-Hun Kim ◽  
Bum-Jun Kim ◽  
Jung-Min Park ◽  
Chung-Yuen Won
Keyword(s):  
Decentralized Control ◽  
Control Method ◽  
Input Voltage ◽  
Current Control ◽  
Control Loop ◽  
Output Current ◽  
Signal Model ◽  
Control Loops ◽  
Current Sharing ◽  
Small Signal Model

Input-Series-Output-Parallel (ISOP) converters, a kind of modular converter, are used in high-input voltage and high-output current applications. In ISOP converters, Input Voltage Sharing (IVS) and Output Current Sharing (OCS) should be implemented for stable operation. In order to solve this problem, this paper proposes a decentralized control method. In the proposed control, output current reference is changed according to the decentralized control characteristic in individual current control loops. In this way, the proposed control method is able to implement IVS and OCS without communication. Also, this method can be easily used in current control loops and has high reliability compared to conventional control methods that require communication. In this paper, the operation principle is described to elucidate the proposed control and a small signal model of an ISOP converter is also implemented. Based on the small signal model, IVS stability analysis is performed using pole-zero maps with varying coefficients and control gains. In addition, the current control loop is designed in a stable region. In order to demonstrate the proposed control method, a prototype ISOP converter is configured using full-bridge converters. The performance of IVS and OCS in an ISOP converter is verified by experimental result.

scholarly journals Shaping SiC MOSFET Voltage and Current Transitions by Intelligent Control for Reduced EMI Generation

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 508 ◽  
Author(s):  
Congwen Xu ◽  
Qishuang Ma ◽  
Ping Xu ◽  
Tongkai Cui
Keyword(s):  
Intelligent Control ◽  
Electromagnetic Interference ◽  
Output Voltage ◽  
Closed Loop ◽  
Control Method ◽  
Reference Signal ◽  
Current Control ◽  
Oxide Semiconductor ◽  
Output Current ◽  
High Frequency Region

In power converters, the fast switching of the power conversion components results in rapid changes in voltage and current, which results in oscillations and high-level electromagnetic interference (EMI), so the power components become a source of internal electromagnetic interference. Taking SiC Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) as an example, an intelligent control method to suppressing interference sources is proposed in this paper. The combination of open-loop and closed-loop methods can simultaneously reduce the electromagnetic interference generated by voltage and current. Firstly, this paper analyzes how to select a reference signal. The relationship between the time domain and the frequency domain of the noise signal is analyzed. The convolution of the trapezoidal signal and the Gaussian signal is selected as the reference signal, which is named S-shaped signal in this paper. The S-shaped signal has continuous infinitely conductive characteristics, so its spectrum has a large attenuation in the high frequency region. Secondly, a new topology is proposed. Based on the closed-loop gate control, a current control signal is added, which can simultaneously shape the output voltage and control the output current slope. Both the simulation results and the experimental results show that the output voltage can follow the reference signal, S-shaped signal, and the slope and overshoot of output current can be changed. Compared with classical gate driver method, the spectrum of output voltage and output current obtained by the method proposed in this paper has a large attenuation, in other words, the electromagnetic interference is significantly reduced.

scholarly journals Disturbance Rejection Control Method for Isolated Three-Port Converter with Virtual Damping

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3204 ◽  
Author(s):  
Jiang You ◽  
Mengyan Liao ◽  
Hailong Chen ◽  
Negareh Ghasemi ◽  
Mahinda Vilathgamuwa
Keyword(s):  
Power Density ◽  
Control Strategy ◽  
Disturbance Rejection ◽  
Control Method ◽  
Damping Ratio ◽  
Current Control ◽  
Resonant Peak ◽  
Model Parameters ◽  
Control Performance ◽  
Disturbance Rejection Control

The high-power density and capability of three-port converters (TPCs) in generating demanded power synchronously using flexible control strategy make them potential candidates for renewable energy applications to enhance efficiency and power density. The control performance of isolated TPCs can be degraded due to the coupling and interaction of power transmission among different ports, variations of model parameters caused by the changes of the operation point and resonant peak of LC circuit. To address these issues, a linear active disturbance rejection control (LADRC) system is developed in this paper for controlling the utilized TPC. A virtual damping based method is proposed to increase damping ratio of current control subsystem of TPC which is beneficial in further improving dynamic control performance. The simulation and experimental results show that compared to the traditional frequency control strategy, the control performance of isolated TPC can be improved by using the proposed method.

scholarly journals Predictive Control Method Based on Adjacent Vector Confinement Technique for a Three-Phase AC-DC Matrix Converter with High Efficiency

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1535
Author(s):  
Eun-Su Jun ◽  
Hoang-Long Dang ◽  
Sangshin Kwak
Keyword(s):  
Control Strategy ◽  
High Efficiency ◽  
Control Method ◽  
Sampling Period ◽  
Matrix Converter ◽  
Current Control ◽  
Total Efficiency ◽  
Unity Power Factor ◽  
Switching Losses ◽  
The Cost

A model predictive current control method is proposed to reduce switching losses in an AC-DC matrix converter. In the proposed control strategy, several vectors are selected from among all possible switching vectors for a given location of the input current reference. The switching vector that minimizes the cost function is applied to the converter in the next sampling period. The principle of the proposed method involves clamping the selected switches to stop performing the switching operation to minimize the number of switchings in every sampling cycle. The total efficiency of the AC-DC matrix converter under the proposed strategy is 91.2% whereas that of the conventional strategy is 89.7%. In addition, unity-power-factor operation is guaranteed and smooth and sinusoidal waveforms are achieved. Finally, simulation and experimental results are demonstrated to confirm the validity of the proposed control strategy.

A New Duty Cycle Control Strategy for Digital Constant-Current LED Drive Based on Buck-Boost Topology

2013 ◽  
Vol 392 ◽  
pp. 676-681
Author(s):  
Lin Bo Wang ◽  
Hong Kun He ◽  
Lei Shi ◽  
Jin Jin Yang ◽  
Qian Ni Feng
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
High Speed ◽  
Control Method ◽  
Visible Light Communication ◽  
Input Voltage ◽  
Current Control ◽  
Constant Current ◽  
Output Current ◽  
Embedded Chip

This paper proposes a new digital constant-current control method for high-power LED drive based on buck-boost topology. In this control system, buck-boost topology is used as the power conversion. The output voltage can be either higher or lower than the input voltage in buck-boost topology. Therefore, it solves the problem that in the buck topology the input voltage is required to be always higher than the output voltage. Furthermore, according to the input and output parameters, the duty cycle data which are used to maintain output current constant can be calculated in advance, and stored in the embedded chip. Thus, it can reduce the calculation of the embedded chip and solves the problem that the existing digital constant-current controllers need the high-speed analog-to-digital converter. In addition, in order to reduce the error generated in above calculation, the double threshold feedback circuit is used to fine-tune the duty cycle and makes the output current more steady and accurate. Meanwhile, due to adopting full-digital control, the brightness and flicker frequency of load LED can be conveniently regulated by modifying the system firmware. Therefore, this method can apply to the device of illumination, lighting decoration, visible light communication and so on.

On a novel current control method for matrix converter

2017 ◽  
Author(s):  
Bin Wang ◽  
Da-Qing Gao ◽  
Diao Chen ◽  
Cai Ning ◽  
Guo Ling
Keyword(s):  
Control Method ◽  
Matrix Converter ◽  
Current Control
Sign in / Sign up

Export Citation Format

Share Document