Characteristics of Parallel Operation of Inverter-Type Distributed Generators Operated by a Virtual Synchronous Generator

2015 ◽  
Vol 192 (4) ◽  
pp. 9-19 ◽  
Author(s):  
Kenichi Sakimoto ◽  
Yushi Miura ◽  
Toshifumi Ise
Keyword(s):  
Synchronous Generator ◽  
Parallel Operation ◽  
Distributed Generators ◽  
Virtual Synchronous Generator

scholarly journals Precise Reactive Power-Voltage Droop Control of Parallel Virtual Synchronous Generators that Considers Line Impedance

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1344
Author(s):  
Xiangwu Yan ◽  
Hongbin Ma ◽  
Jiaoxin Jia ◽  
Waseem Aslam ◽  
Chenguang Wang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Integrated Control ◽  
Synchronous Generator ◽  
Control Voltage ◽  
Droop Control ◽  
Parallel Operation ◽  
Distributed Generators ◽  
Power Decoupling ◽  
Virtual Synchronous Generator

Problems such as high power coupling, low distribution accuracy, and insufficient reactive power-voltage droop accuracy occur when distributed generators are operated in parallel due to the influence of line impedance. The precise control of output reactive power and voltage is difficult to achieve using traditional virtual synchronous generator (VSG) control. Taking this into consideration, this study proposes a virtual synchronous generator reactive power-voltage integrated control strategy that considers line parameters to solve this problem. First, the impedance voltage drop of the line is compensated for in accordance with local information control to ensure the consistency of the control voltage in parallel operation of distributed generators and to realize the precise droop control of reactive power and the voltage of the point of common coupling (UPCC). Second, virtual negative impedance control is added to change the equivalent output impedance characteristics of the system and achieve power decoupling. On this basis, the active frequency and reactive voltage decoupling control effect of the improved control strategy is quantified and analyzed using the relative gain matrix. The accuracy of reactive power distribution and droop control is theoretically derived and analyzed by establishing a small-signal model of a two-machine parallel system. Finally, the accuracy and effectiveness of the proposed integrated control strategy are verified via a simulation model and an experimental platform for parallel operation. Results show that the proposed integrated control strategy can effectively solve the problems of power decoupling and accurate distribution, reduce system loop current, and realize accurate reactive power-voltage droop. Compared with the traditional VSG control strategy, the dynamic deviation of UPCC is reduced by at least 40% when a large-scale load disturbance occurs.

Power Sharing for Inverters Based on Virtual Synchronous Generator Control

2016 ◽  
Vol 2 (2) ◽  
pp. 305
Author(s):  
Hashim Hasabelrasul Hamid ◽  
Amar Ibrahim Hamza Ahmed
Keyword(s):  
Control Strategy ◽  
Simulation Experiment ◽  
Synchronous Generator ◽  
Power Sharing ◽  
Parallel Operation ◽  
Dynamic Features ◽  
Transient Dynamic ◽  
Multilevel Inverters ◽  
Three Phase ◽  
Virtual Synchronous Generator

<p>Power sharing is the most important challenging today, especially for parallel operation inverters. Recently to fixed this problem the virtual synchronous generator control strategy has been used. This paper introduced the parallel operation of three phase multilevel inverters with different capacities to share load power by used a newly strategy named VSG with droop method controller. The control strategy is used to make the inverters to emulate the transient , dynamic features of conventional synchronous generator and to gives accurate load sharing among the inverters in proportional to their ratings. To verify the performance of the proposed technique MATLAB/Simulink package for simulation experiment is established.</p>

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