scholarly journals Coordination control strategy for LLCL-filter based grid-tied inverter with indirect sliding mode power control and virtual impedance

2019 ◽  
Vol 2019 (16) ◽  
pp. 2804-2809
Author(s):  
Lizhen Wu ◽  
Tengfei Liu ◽  
Xiaohong Hao
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Coordination Control ◽  
Virtual Impedance

Research on Output Power Control Strategy of Parallel Microgrid Based on Improved Virtual Impedance

2021 ◽  
Author(s):  
Li Shiguang ◽  
Liu Guangjie ◽  
Gao Zhengzhong ◽  
Sun Yuchen ◽  
Xu Yujuan
Keyword(s):  
Power Control ◽  
Output Power ◽  
Control Strategy ◽  
Virtual Impedance

scholarly journals Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid

2019 ◽  
Vol 9 (22) ◽  
pp. 4876 ◽  
Author(s):  
Eder Molina ◽  
John E. Candelo-Becerra ◽  
Fredy E. Hoyos
Keyword(s):  
Power Control ◽  
Electric Vehicles ◽  
Control Strategy ◽  
Reactive Power ◽  
Control Variable ◽  
Control Voltage ◽  
Primary Control ◽  
Distributed Generator ◽  
Distributed Generators ◽  
Virtual Impedance

This paper presents a control strategy to regulate voltage and share reactive power from distributed generators in a microgrid when electric vehicles (EVs) are connected and disconnected at different nodes and times. The control strategy considers fixed and variable virtual impedances created in the microgrid (MG) when loads change (EVs are connected or disconnected). Fixed virtual impedance is related to the distance from each house to the power inverter and is used as an input of the primary control. Variable virtual impedance is associated with the distance from each EV to the power inverter and is also used as an input of the primary control. Thus, the control of the inverter seeks to regulate the voltage where the EVs create variations in the network. The results show that the control strategy regulates well the voltage of different nodes, and the reactive power is distributed to renewable generators based on the distance from the loads to the inverters. By considering the fixed and variable virtual impedances in the primary control, voltage can be regulated, assuming various consumptions of EVs in the network. This result is promising for reactive power control and sharing for each distributed generator (DG) in a microgrid where a great number of EVs affect the operation.

scholarly journals Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 227 ◽  
Author(s):  
Hao Lin ◽  
Jose I. Leon ◽  
Wensheng Luo ◽  
Abraham Marquez ◽  
Jianxing Liu ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Power Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Harmonic Distortion ◽  
Direct Power ◽  
Direct Power Control ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Mode Control

Three-level neutral-point-clamped (NPC) converter is widely used in energy conversion systems due to its good properties for high-power systems presenting output waveforms with reduced harmonic distortion. To obtain better system performance, an integral sliding-mode control (ISMC)-based direct power control (DPC) strategy is proposed for NPC converters. The controller achieves three objectives. First, an extended state observer (ESO)-based ISMC strategy, to enforce the active and reactive power to their reference values, is applied in the power tracking loop. ESO is used to reduce the influence of parameter uncertainties. Next, in the voltage regulation loop, a radial basis function neural network (RBFNN)-based adaptive ISMC strategy is applied to regulate the DC-link voltage. RBFNN is used to estimate the load variation, which is considered as a disturbance, to improve the system disturbance rejection ability. An adaptive law is used in the controller to reduce the chattering of reference active power which can reduce the current harmonic distortion. Finally, a proportional-integral (PI) control strategy is applied in the voltage balancing loop to achieve voltage balance between two DC-link capacitors. Experimental results show the effectiveness and superiority of the proposed control strategy for the NPC power converter compared with PI-based DPC strategy.

Direct power control strategy for an axial flux permanent magnet synchronous machine

2019 ◽  
Vol 102 (1) ◽  
pp. 481-491
Author(s):  
Juan Torres ◽  
Rubén Peña ◽  
Javier Riedemann ◽  
Juan Tapia ◽  
Roberto Moncada ◽  
...  
Keyword(s):  
Power Control ◽  
Permanent Magnet ◽  
Control Strategy ◽  
Synchronous Machine ◽  
Permanent Magnet Synchronous Machine ◽  
Direct Power ◽  
Axial Flux ◽  
Direct Power Control
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