DOI:10.35833/MPCE.2018.000472 |
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An Improved Virtual Inertia Algorithm of Virtual Synchronous Generator |
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Page view: 109
Net amount: 647 |
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Author:
Haizhen Xu1,Changzhou Yu1,Chun Liu1,Qinglong Wang1,Xing Zhang2
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Author Affiliation:
1.Department of Electronic Information and Electrical Engineering, Hefei University, Hefei, China;2.Anhui Provincial Engineering Laboratory of Renewable Energy and Industrial Energy Conservation, Hefei University of Technology, Rostock, China
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Foundation: |
This work was supported by the Natural Science Foundation of Anhui Province of China (No. 1908085QE208, No. 1808085QE156), and the 2018 Academic Foundation Program for the Major’s Talents of Anhui Colleges and Universities (No. GXBJZD40). |
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Abstract: |
Virtual synchronous generator (VSG) simulates the first-order motion equation of a synchronous generator (SG) with the algorithm. VSG can improve the system voltage and frequency support capabilities of a microgrid or a weak grid. It is now widely applied at a high penetration level of distributed generation (DG) systems. However, because there is a contradiction between active power steady-state deviation of VSG and dynamic impact regulation, the VSG running in grid-connected mode with existing strategies cannot meet the steady and dynamic control requirements. Thus, an improved virtual inertial control strategy of VSG is proposed in this paper. The active power impact is reduced effectively under the circumstance of damping coefficient D ω equal to 0 and a large inertia, thus the dynamic characteristic of active power is improved and its steady-state characteristic is maintained. Firstly, based on the analysis of the damping coefficient effect on the system dynamic process, two forms of improved virtual inertia algorithms are put forward by cascading a differential link into different positions of the first-order virtual inertia forward channel. Then, by comparing the characteristics of the system with the two improved algorithms, the improved virtual inertial strategy based on differential compensation is proven to be better, and the design of its parameters is analyzed. Finally, simulation and experimental results verify the effectiveness of the proposed algorithm. |
Keywords: |
Virtual synchronous generator (VSG) ; virtual inertia ; microgrid ; distributed generation (DG). |
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Received:July 19, 2018
Online Time:2020/03/24 |
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