scholarly journals Current Control Reference Calculation Issues for the Operation of Renewable Source Grid Interface VSCs Under Unbalanced Voltage Sags

2011 ◽  
Vol 26 (12) ◽  
pp. 3744-3753 ◽  
Author(s):  
Adrià Junyent-Ferre ◽  
Oriol Gomis-Bellmunt ◽  
Tim C. Green ◽  
Diego E. Soto-Sanchez
Keyword(s):  
Current Control ◽  
Voltage Sags ◽  
Renewable Source ◽  
Grid Interface ◽  
Unbalanced Voltage

scholarly journals Voltage Ride through Control Strategy of Modular Multilevel Converter under Unbalanced Voltage Sag

2019 ◽  
Vol 9 (3) ◽  
pp. 551
Author(s):  
Seyed Hakimi ◽  
Amin Hajizadeh
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Current Control ◽  
Adaptive Robust Control ◽  
Voltage Sag ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Control Approach ◽  
Control Loops ◽  
Unbalanced Voltage

This paper develops modeling and describes a control strategy for a modular multilevel converter (MMC) for grid-connected renewable energy systems. The proposed model can be used to simulate MMC activity during normal and faulty situations. Firstly, a dynamic model of a grid-connected MMC (GC-MMC), based upon the symmetrical component of voltages and currents, was designed. Then an adaptive robust control approach was established in order to follow the reference currents of the converter and stabilize the submodule (SM) capacitor voltage. The positive and negative sequences of reference currents that were given from the demanded active and reactive power during grid voltage disturbance and a normal situation were then utilized in control loops. Finally, the numerical results for the performance of the MMC throughout voltage sag conditions and the effect of uncertainties on the filter parameters during changing power demands were evaluated. The results specified that the current control strategy is more potent under voltage sag situations and able to fulfill the stability requirements of the MMC.

Circulating Current Control in MMC Under the Unbalanced Voltage

2013 ◽  
Vol 28 (3) ◽  
pp. 1952-1959 ◽  
Author(s):  
Ji-Woo Moon ◽  
Chun-Sung Kim ◽  
Jung-Woo Park ◽  
Dea-Wook Kang ◽  
Jang-Mok Kim
Keyword(s):  
Current Control ◽  
Circulating Current ◽  
Unbalanced Voltage

Analysis on Power Output Capability and its Power Control Strategy of DFIG Wind Turbine under Unbalanced Grid Voltage

2013 ◽  
Vol 448-453 ◽  
pp. 1819-1824
Author(s):  
Shu Ju Hu ◽  
Ling Ling Wang ◽  
Ya Deng
Keyword(s):  
Power Control ◽  
Wind Turbine ◽  
Control Strategy ◽  
Power Output ◽  
Reactive Power ◽  
Maximum Output ◽  
Voltage Sags ◽  
Active And Reactive Power ◽  
Unbalanced Voltage ◽  
Power Limit

Wind turbines are required by gird codes that active and reactive power should be fed into power grid during gird faults such as voltage sags. Power output capability is important for DFIG wind turbine to provide active and reactive power support. Constraints of stator, rotor maximum current and maximum output voltage of rotor-side converter (RSC) of DFIG are considered to analyze stator power output limit of the DFIG under unbalanced voltage sags, and newton-raphson method is used to solve the power limits, then the power control strategy based on power limit analysis is proposed. Simulation, calculation and comparison are carried out by a 1.5MW DFIG wind turbine model, and the effectiveness of the analysis and the proposed control strategy is verified.

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