scholarly journals Balanced Current Control Strategy for Current Source Rectifier Stage of Indirect Matrix Converter under Unbalanced Grid Voltage Conditions

Energies ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 27 ◽  
Author(s):  
Yeongsu Bak ◽  
June-Seok Lee ◽  
Kyo-Beum Lee
Keyword(s):  
Control Strategy ◽  
Current Source ◽  
Matrix Converter ◽  
Current Control ◽  
Grid Voltage ◽  
Unbalanced Grid

Dual-Current Loops Control Strategy of PWM Rectifier under Unbalanced Grid Voltage Conditions

2014 ◽  
Vol 556-562 ◽  
pp. 2114-2118
Author(s):  
Yi Feng Ni ◽  
Yong Qiang Zhu
Keyword(s):  
Control Strategy ◽  
Active Power ◽  
Current Control ◽  
Pwm Rectifier ◽  
Current Harmonics ◽  
Dc Voltage ◽  
Grid Voltage ◽  
Instantaneous Power ◽  
Sequence Components ◽  
Unbalanced Grid

The unbalanced grid voltage causes the current harmonics, the fluctuation of the active power in AC side and the fluctuation of the DC voltage. The dual-current loops control strategy can slove those problems. The positive and negative sequence components of grid voltages and currents were calculated based on the symmetrical component method and were used to calculate the instantaneous power in double dq rotate coordinate, which ratate at positive and negative synchronous angular velocity respectively. The dual-current loops control strategy was finally verified in simulation by comparing with the conventional synchronous PI current control. The simulation results show the dual-current loops control strategy is effective on eliminating the fluctuation of the active power in AC side and the fluctuation of the DC voltage.

A direct power control strategy for three level neutral-point-clamped rectifier under unbalanced grid voltage

2018 ◽  
Vol 161 ◽  
pp. 103-113 ◽  
Author(s):  
Billel Kahia ◽  
Abdelouahab Bouafia ◽  
Abdelmadjid Chaoui ◽  
Zhenbin Zhang ◽  
Mohamed Abdelrahem ◽  
...  
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Neutral Point ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Unbalanced Grid

scholarly journals A Comprehensive VSM Control Strategy Designed for Unbalanced Grids

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1169 ◽  
Author(s):  
Huiyu Miao ◽  
Fei Mei ◽  
Yun Yang ◽  
Hongfei Chen ◽  
Jianyong Zheng
Keyword(s):  
Control Strategy ◽  
Current Source ◽  
Synchronous Machine ◽  
Normal Operation ◽  
Complex Coefficient ◽  
Negative Sequence ◽  
Grid Voltage ◽  
Power Oscillations ◽  
Negative Sequence Current ◽  
Virtual Synchronous Machine

A virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid voltage is unbalanced, there will be negative sequence current and power oscillations. There will also be double-frequency ripples on the DC bus, which affect the normal operation of the DC power source or load. In order to solve these problems, a comprehensive control strategy is proposed in this paper. The principle of a VSM operated as a current source converter, also called VISMA, is used in the design. A complex coefficient filter is applied to separate the positive and negative sequence components of the grid voltage. By analyzing the reasons of power oscillations under unbalanced voltage, the electrical simulation part of the VSM is improved to achieve several objectives: to suppress negative sequence current and DC voltage ripples. Additionally, the rated voltage in the reactive control part is adaptively adjusted to stabilize the system. The validity of the proposed control strategy is verified by simulation and experiment.

scholarly journals Methods of Modulation for Current-Source Single-Phase Isolated Matrix Converter in a Grid-Connected Battery Application

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3845
Author(s):  
Goh Teck Chiang ◽  
Takahide Sugiyama
Keyword(s):  
Single Phase ◽  
Current Source ◽  
Direct Conversion ◽  
Matrix Converter ◽  
Current Control ◽  
Grid Current ◽  
Circuit Structure ◽  
Power Decoupling ◽  
The Matrix ◽  
Battery Application

This paper discusses three methods of modulation for a single-phase isolated matrix converter. The matrix converter is combined with a transformer integration to perform power decoupling control in order to reduce the number of component and capacitor volumes. Due to the reason of (i) Alternating current (AC/AC) direct conversion and (ii) transformer integration, obtaining a clean sinusoidal grid current waveform in the modulation of matrix converter (MC) is important. Three methods of modulation are compared in terms of control complexity, quality waveform, and inductive-capacitive-inductive (LCL) filter sizing. The principal control of each method is described. Finally, a prototype was tested to verify the validity and the effectiveness of grid current control and power decoupling in the spoken circuit structure.

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