Grid Frequency Support Control Strategy of Three-phase Cascaded H-bridge Photovoltaic Grid-connected System

被引：0
|
作者：
Li X. [1 ]
Yuan X. [2 ]
Chai J. [3 ]
Li M. [4 ]
Li L. [1 ]
You R. [1 ]
机构：
[1] College of Electrical Engineering, Qingdao University, Shandong Province, Qingdao
[2] School of Electrical Engineering, China University of Mining and Technology, Jiangsu Province, Xuzhou
[3] Department of Electrical Engineering, Tsinghua University, Haidian District, Beijing
[4] College of Engineering, Ocean University of China, Shandong Province, Qingdao
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 04期
基金：
中国国家自然科学基金;
关键词：
active power reserve; cascaded H-bridge inverter; frequency support; photovoltaic power generation;
D O I：
10.13335/j.1000-3673.pst.2022.0677
中图分类号：
学科分类号：
摘要：
As a clean and safe energy resource, photovoltaic (PV) power generation has become an effective way to solve the problems like energy crisis and environmental pollution. However, because the PV grid-connected inverter does not have inertia and damping characteristics, with the increased penetration of PV power generation in the grid, the large-scale PV grid-connection has posed a challenge to the grid frequency stability. The cascaded H-bridge (CHB) inverter has become a promising candidate for the PV systems due to its advantages of having a modular structure and being able to directly connected to the grid without any power frequency transformers. An inverter control strategy with the function of supporting the grid frequency is proposed in this paper for the three-phase CHB PV grid-connected system. With the PV string active power reserve, the grid frequency dynamic characteristics are improved without any extra energy storage devices. In order to avoid the common three-phase power imbalance for the CHB topology, the power reserve distribution control is used in between the three phases and between the PV strings in each phase. Therefore, the three-phase power balance and the H-bridge input power balance are maximized, the balanced three-phase current output is realized, and the over-modulation risk in the H-bridge module is reduced. Finally, simulation models are built in the Matlab/Simulink and a 10kW experimental platform is also built, verifying the effectiveness of the control strategy proposed. © 2023 Power System Technology Press. All rights reserved.
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页码：1407 / 1414
页数：7
相关论文
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