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Stability Comparison of Paralleled String Inverters and Central Inverters in PV System
Changzhou Yu,Haizhen Xu,Chun Liu,Qinglong Wang,Xing Zhang,Fang Liu,Fei Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Mega-scale solar projects are turning to string inverters nowadays. Multi-parallel string inverters are employed as the interface to the utility grid, giving rise to potential unstable problems. Aiming at this issue, the relationship between number of inverters, output power and grid impedance is analyzed. Based on this, according to different topology, control structures and filter parameters, four types of Standard Equivalent Model (SEM) for multiinverters system are established. By analyzing the stability margin of the four SEMs and the sensitivity of their control parameters, the difference of stability between the string inverters and the central inverters is compared. Finally, the established SEM and the comparison results of the string and central inverters are verified by simulation and experimental results.
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A Virtual Inertia Control Strategy Based on Multi-order lead-lag Compensation
Haizhen Xu,Changzhou Yu,Chun Liu,Qinglong Wang,Xing Zhang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In view of the contradiction between active power steady-state and dynamic characteristics regulation of VSG based on the existing first-order virtual inertia algorithm operating in grid- connected mode and multiparalleled mode, a virtual inertia control strategy based on multi-stage lead-lag compensation is proposed in this paper. By cascading a multi-stage lead-lag link in the first -order virtual inertia forward channel, the control freedom of VSG grid-connected and paralleled system is increased, so that the zero and poles can be freely configured. Furthermore, a firstorder lead-lag link is taken as an example to analyze its effect on the output active power steady-state and dynamic characteristics of VSG grid-connected system and paralleled systems. Through reasonable configuration of the secondorder virtual inertia parameters, the system damping ratio can be increased and the power oscillation can be eliminated while its steady-state characteristics are not changed under the circumstance of a large inertia. Experimental results verify the effectiveness of the proposed strategy.
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