Improving Dynamic Performance of DFIG Using Rotor-Side SFCL and DC-Link Brake Chopper During Grid Voltage Swell

2020 ◽  
Author(s):  
Zhi-Ce Zou ◽  
Zi-Long Mu ◽  
Ran Ou ◽  
Yi Lei ◽  
Hai-Bo Li ◽  
...  
Keyword(s):  
Dynamic Performance ◽  
Grid Voltage ◽  
Voltage Swell

scholarly journals Separated Phase–Current Controls Using Inverter-Based DGs to Mitigate Effects of Fault Current Contribution from Synchronous DGs on Recloser–Fuse

2019 ◽  
Vol 9 (20) ◽  
pp. 4311 ◽  
Author(s):  
Boonyapakdee ◽  
Konghirun ◽  
Sangswang
Keyword(s):  
Dynamic Performance ◽  
Voltage Regulation ◽  
Current Control ◽  
Current Phase ◽  
Fault Current ◽  
Grid Voltage ◽  
Phase Current ◽  
Distributed Generators ◽  
Current Contribution ◽  
Measurement Units

Synchronous distributed generators (SDGs) significantly affect recloser–fuse coordination due to the high fault current contribution. This paper proposes a separated phase–current control using inverter-based distributed generators (IBDGs) to remove the effects of fault current contributions from SDGs during unsymmetrical faults. The three-phase current produced by IBDGs is independently controlled. While the total fault current is reduced by adjusting the current phase angle in the faulty phase, the energy in the DC-link capacitor (Cdc) is delivered to the grid in order to avoid the rise of DC-link voltage (Vdc) by means of injection of the active current into the nonfaulty phase. To maintain the proper grid voltage, the voltage regulation feature is installed in the IBDGs. Moreover, current estimations programmed within the IBDGs are introduced to avoid the performance degradation of separated phase–current controls caused by phasor measurement units (PMUs). The dynamic performance of the separated phase–current controls using IBDGs was evaluated using an IEEE 34-node radial test feeder. According to the simulation results, the IBDGs could eliminate the effects of fault current contributions from the SDG without interruption since the disconnections caused by excessive Vdc were prevented. They could also regulate the grid voltage in the nonfaulty phase.

scholarly journals Control strategy of doubly-fed induction generator during the grid voltage swell

2019 ◽  
Vol 2019 (16) ◽  
pp. 1807-1811
Author(s):  
Zou Le ◽  
Wu Xueguang ◽  
Kou Longze ◽  
Liu Dong ◽  
Li Fangyuan ◽  
...  
Keyword(s):  
Control Strategy ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Grid Voltage ◽  
Voltage Swell ◽  
Doubly Fed

scholarly journals A Simple Operation Approach for Modular Multilevel Converter Under Grid Voltage Swell in Medium-Voltage Microgrids

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 147280-147291
Author(s):  
Qian Xiao ◽  
Yu Jin ◽  
Linglin Chen ◽  
Xiaodan Yu ◽  
Hongjie Jia ◽  
...  
Keyword(s):  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Grid Voltage ◽  
Medium Voltage ◽  
Simple Operation ◽  
Voltage Swell

scholarly journals An Analysis of Virtual Flux Direct Power Control of Three-Phase AC-DC Converter

2018 ◽  
Vol 9 (3) ◽  
pp. 947 ◽  
Author(s):  
Nor Azizah Mohd Yusoff ◽  
Azziddin M. Razali ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Steady State ◽  
Power Control ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Three Phase ◽  
Virtual Flux

<p>This paper presents an analysis of virtual-flux direct power control (VFDPC) technique for the three-phase pulse width modulation (PWM) ac-dc converter. The proposed VFDPC is developed by assuming the grid voltage and converter line filters quantities are related to a virtual three-phase ac motor. The controller works with less number of sensors by eliminating the voltage sensors used for measuring the three-phase grid voltage. The grid virtual flux which is proportional to the grid voltage will be estimated from the information of converter switching states, line current, and dc-link output voltage. Several analyses are performed in order to study the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations. The proportional integral (PI) controller at the outer voltage control loop of VFDPC is tuned properly and the entire PWM ac-dc converter system is simulated using MATLAB/Simulink to ensure the dc output voltage follow the desired output voltage under steady state and dynamic conditions. Ac-dc converter utilizing the proposed VFDPC is able to generate three-phase input current waveforms that are almost sinusoidal with low harmonics contents which is less than 5% and near unity power factor (<em>pf</em>) operation.</p>

scholarly journals Integration of Photovoltaic Power Units to Power Distribution System through Modular Multilevel Converter

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2753 ◽  
Author(s):  
Seyed Hakimi ◽  
Amin Hajizadeh
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Sliding Mode ◽  
Dynamic Performance ◽  
Lyapunov Theory ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Power Distribution System ◽  
Grid Voltage

With the growing of using photovoltaic (PV) units in power distribution systems, the role of high-performance power electronic converters is increasing. In this paper, modelling and control of Modular Multilevel Converter (MMC) are addressed for grid integration of PV units. Designing a proper controller for MMC is crucial during faulty conditions to make the converter stable and provide proper dynamic performance. To achieve this goal, a dynamic model of MMC is presented which it includes symmetrical components of voltage and current. Then, adaptive robust current controllers are developed based on sliding mode and fuzzy controllers for MMC and then the robustness and stability of the controllers are proved by the Lyapunov theory. To implement the proposed controllers under unbalanced grid voltage fault, positive and negative sequences current controllers are implemented to compensate the effect of grid voltage fault and load power variation. Finally, numerical results are shown to evaluate the performance of MMC. In the end, the experimental results are given to prove the controller performance. The outcome indicates that the proposed current controllers are more effective under voltage disturbance conditions and could satisfy the stability of MMC.

Sensitivity of Commercial Rooftop Photovoltaic Inverters to Grid Voltage Swell

2021 ◽  
Author(s):  
Hossein Dehghani Tafti ◽  
Awais Ahmad ◽  
Leonardo Callegaro ◽  
Georgios Konstantinou ◽  
John E. Fletcher
Keyword(s):  
Grid Voltage ◽  
Voltage Swell

Improved ride-through control of DFIG during grid voltage swell

2014 ◽  
pp. 1-1 ◽  
Author(s):  
zhen xie ◽  
xuguang zhang ◽  
Xing Zhang ◽  
shuying yang ◽  
Lingxiang Wang
Keyword(s):  
Grid Voltage ◽  
Voltage Swell

Control Strategy of Full Power Converter for Wind Turbine under Grid Voltage Swell

2013 ◽  
Vol 448-453 ◽  
pp. 1815-1818 ◽  
Author(s):  
Zi Xu Lin ◽  
Hong Hua Xu ◽  
Wang Jian
Keyword(s):  
Wind Turbine ◽  
Control Strategy ◽  
Reactive Power ◽  
Power Converter ◽  
Grid Voltage ◽  
Dynamic Voltage ◽  
Voltage Swell ◽  
Voltage Swells ◽  
Full Power ◽  
The Impact

LVRT technology is currently a hot research of wind power, but the impact on the wind turbine of grid voltage swells and HVRT technology have not been given sufficient attention. This article analyzed the converter problems of full power wind turbine on grid voltage swells and used the control strategy of reactive power control, dynamic voltage and over-modulation to enhance the full power wind turbines HVRT capability.

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