scholarly journals Improved Predictive Control in Multi-Modular Matrix Converter for Six-Phase Generation Systems

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2660
Author(s):  
Sergio Toledo ◽  
Edgar Maqueda ◽  
Marco Rivera ◽  
Raúl Gregor ◽  
Pat Wheeler ◽  
...  
Keyword(s):  
Control Strategy ◽  
Energy Demand ◽  
Harmonic Distortion ◽  
Matrix Converter ◽  
Current Control ◽  
Wind Generation ◽  
Feasible Option ◽  
Power Stage ◽  
Converter Topology ◽  
Multi Phase

Distributed generation systems are emerging as a good solution as part of the response to the world’s growing energy demand. In this context multi-phase wind generation systems are a feasible option. These systems consist of renewable AC sources which requires efficient and controlled power conversion stages. This work proposes a novel predictive current control strategy that takes advantage of a multi-modular matrix converter topology in the power stage of a six-phase generation system. The proposed method uses a coupling signal between the modules to decrease the error and the total harmonic distortion compared to independent control of each module. Experimental results validate the new control strategy showing the improvement regarding the target parameters.

A simple current control strategy for four-leg direct Matrix converter

2015 ◽  
Author(s):  
Han Hua ◽  
Li Zhejun ◽  
Mao Yongmei ◽  
Wang Hui ◽  
Dan Hanbing ◽  
...  
Keyword(s):  
Control Strategy ◽  
Matrix Converter ◽  
Current Control

scholarly journals A Simple Current Control Strategy for a Four-Leg Indirect Matrix Converter

2015 ◽  
Vol 30 (4) ◽  
pp. 2275-2287 ◽  
Author(s):  
Crisitian Garcia ◽  
Marco Rivera ◽  
Miguel Lopez ◽  
Jose Rodriguez ◽  
Ruben Pena ◽  
...  
Keyword(s):  
Control Strategy ◽  
Matrix Converter ◽  
Current Control

scholarly journals A novel control strategy for power quality improvement in grid-connected solar photovoltaic system

2019 ◽  
Vol 15 (3) ◽  
pp. 1264
Author(s):  
Pankaj Gakhar ◽  
Manoj Gupta
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Control Strategy ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Current Control ◽  
Total Harmonic Distortion ◽  
Solar Photovoltaic ◽  
Power Quality Improvement

<p>In this paper, a novel and dynamic, current control based inverter control strategy has been used for energy optimization and power quality improvement in a grid-connected solar photovoltaic plant using a PI controller. The output of the plant is delivered to the grid passing through a boost converter controlled by an MPPT controller and an inverter. The control strategy proposed offers the flexibility to keep control of active as well as reactive power being injected straight into the grid and also helps in mitigating the total harmonic distortion levels. Also, the effect of the conventional PI controller and PI controller optimized through Genetic Algorithm has been compared. The GA-PI controller has been found effective in reducing the Total Harmonic Distortion in the current injected in the grid. The effectiveness of the work has been observed by using a MATLAB/SIMULINK environment.</p>

scholarly journals Research on an Asymmetric Fault Control Strategy for an AC/AC System Based on a Modular Multilevel Matrix Converter

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3137 ◽  
Author(s):  
Chong Zhang ◽  
Daozhuo Jiang ◽  
Xuan Zhang ◽  
Yiqiao Liang
Keyword(s):  
Control Strategy ◽  
Reference Frames ◽  
Control Strategies ◽  
Short Circuit ◽  
Matrix Converter ◽  
Current Control ◽  
Positive Sequence ◽  
Negative Sequence ◽  
Balancing Control ◽  
Secondary Side

This paper studies control strategies for an AC/AC system based on a modular multilevel matrix converter (M3C) when an asymmetric fault occurs in the secondary side ac system. Firstly, the operating principle of M3C is briefly introduced and verified by simulation. Then, based on its mathematical model by double αβ0 transformation, the decoupled control strategies for the primary side and secondary side systems are designed. In view of the asymmetric fault condition of the secondary side system, the positive sequence and negative sequence components of voltages and currents are separated and extracted, and then a proportional resonant controller (PR) is used to regulate the positive and negative sequence currents at the same time to realize decoupled current control in the αβ reference frames. The capacitor voltage balancing control, which consists of an inter-subconverter balancing control and an inner-subconverter balancing control, is realized by adjusting four circulating currents. Finally, the proposed control strategy is validated by simulation in the PSCAD/EMTDC software (Manitoba HVDC Research Center, Canada). The result shows that during the period of the BC-phase short-circuit fault occurring in the secondary side system, the whole system can still operate stably and transmit a certain amount of active power, according to their set values. Furthermore, the capacitor voltages are balanced, with a slight increase during the fault period. The simulation results verify the effectiveness of the proposed control strategy.

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.

scholarly journals Synchronous Reference Frame Repetitive Control of a Single-Phase Three-Level Dual-Buck Photovoltaic Inverter

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 226 ◽  
Author(s):  
Jung-Yong Lee ◽  
Younghoon Cho
Keyword(s):  
Reference Frame ◽  
Control Strategy ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Current Control ◽  
Output Current ◽  
Pv Inverter ◽  
Synchronous Reference Frame ◽  
Conduction Mode ◽  
Repetitive Controller

This paper proposes a synchronous reference frame (SRF) control strategy for a single-phase, three-level, dual-buck photovoltaic (PV) inverter. The concept of virtual d-q transformation is adapted to the current control of the inverter, and the repetitive controller is implemented in the SRF. With the proposed control strategy, the memory allocation quantity for the repetitive controller is decreased and the capability of the current reference tracking is maximized. Thus, the proposed method significantly reduces the total harmonic distortion (THD) of the output current in both the continuous conduction mode (CCM) and the discontinuous conduction mode (DCM). In addition, the distortion of the output current is mostly composed of odd harmonics. Odd harmonic expressed to the even harmonic in SRF can be calculated using Park’s transformation. Therefore, a repetitive controller can improve dynamics by considering only even harmonic components in SRF rather than including all harmonics. The simulation and the experimental results verify the effectiveness of the proposed control strategy. The proposed method not only reduces the THD of the output current in both the CCM operation and the DCM operation, but also improves the dynamics of the current controller.

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