An enhanced current sharing strategy for islanded ac microgrids based on adaptive virtual impedance regulation

2022 ◽  
Vol 134 ◽  
pp. 107402
Author(s):  
Fei Deng ◽  
Andrea Petucco ◽  
Paolo Mattavelli ◽  
Xiaobin Zhang
Keyword(s):  
Current Sharing ◽  
Sharing Strategy ◽  
Virtual Impedance

scholarly journals Topology optimisation and current sharing strategy of interleaved bidirectional dc/dc converter with coupling technique

2018 ◽  
Vol 11 (15) ◽  
pp. 2470-2480 ◽  
Author(s):  
Tengteng Pan ◽  
Yubin Wang ◽  
Zengbin Qu ◽  
Wendong Tao
Keyword(s):  
Topology Optimisation ◽  
Coupling Technique ◽  
Current Sharing ◽  
Sharing Strategy

scholarly journals Unbalanced Current Sharing Control in Islanded Low Voltage Microgrids

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2776 ◽  
Author(s):  
Foad Najafi ◽  
Mohsen Hamzeh ◽  
Matthias Fripp
Keyword(s):  
Output Power ◽  
Control Structure ◽  
Nonlinear Loads ◽  
Negative Sequence ◽  
Current Sharing ◽  
Current Controller ◽  
Voltage Controller ◽  
Zero Sequence ◽  
Resonant Controller ◽  
Virtual Impedance

This paper reports a new control strategy to improve sharing of unbalanced currents in islanded LV microgrids. This technique provides fast and effective sharing of positive-, negative- and zero-sequence currents, and is the first example of zero-sequence current sharing in the literature. The controllers are designed in the stationary frame. The control structure consists of four loops: (1) the current controller; (2) the voltage controller; (3) the droop controller and the (4) negative and zero sequence current controllers. The output current is considered unknown for the controller and is added to the control system as a disturbance. The proposed controller features a high gain in fundamental and harmonic frequencies, hence a good voltage quality is obtained in the presence of unbalanced and nonlinear loads. To this aim, a proportional-resonant (PR) controller is adopted as the current controller. By using a multi-resonant controller as current controller, a unified control structure is obtained which is suitable for both grid-connected and islanded modes. The voltage controller is designed using a resonant controller so that the voltage can have low VUF and THD in the presence of unbalanced and nonlinear loads. Furthermore, in this paper, the droop method is applied to the control structure to share real and reactive powers. Simulation studies show that the conventional droop method cannot share the oscillatory part of the output power that is due to the presence of unbalanced loads in the microgrid. This paper relies on using zero and negative sequence virtual impedance controller to share the oscillatory part of output power. By using zero-sequence virtual impedance controller (ZSVIC) and negative-sequence virtual impedance controller (NSVIC), the zero and negative sequence currents in the microgrid are controlled and shared effectively. By compensating zero- and negative-sequence currents locally, the flow of these currents in the microgrid is minimized, and the overall power quality of the islanded LV microgrid is improved.

Sensorless parameter estimation and current‐sharing strategy in two‐phase and multiphase IPOP DAB DC–DC converters

2018 ◽  
Vol 11 (6) ◽  
pp. 1135-1142 ◽  
Author(s):  
Yubin Wang ◽  
Fan Wang ◽  
Yifei Lin ◽  
Tianqu Hao
Keyword(s):  
Parameter Estimation ◽  
Two Phase ◽  
Current Sharing ◽  
Sharing Strategy

Enhanced proportional power sharing strategy based on adaptive virtual impedance in low-voltage networked microgrid

2018 ◽  
Vol 12 (11) ◽  
pp. 2566-2576 ◽  
Author(s):  
Jiyuan Zhang ◽  
Jie Shu ◽  
Jia Ning ◽  
Lei Huang ◽  
Hao Wang
Keyword(s):  
Low Voltage ◽  
Power Sharing ◽  
Sharing Strategy ◽  
Virtual Impedance

The Current Sharing Strategy of Three-Phase Series Capacitor Boost Converter Based on Charge-Balance Method

2021 ◽  
Vol 36 (4) ◽  
pp. 4864-4876
Author(s):  
Lingling Zhao ◽  
Yunfeng Wu ◽  
Zhangyong Chen ◽  
Lanxiao Shen ◽  
Changhua Zhang
Keyword(s):  
Boost Converter ◽  
Balance Method ◽  
Charge Balance ◽  
Current Sharing ◽  
Three Phase ◽  
Sharing Strategy ◽  
Series Capacitor
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