Jiaxun Teng;Xinlei Liu;Zizhe Wang;Lei Qi;Min Zhang;Wei Zhao;Xin Li;Xiaofeng Sun
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引用次数: 0
Abstract
Due to differences of solar irradiance, ambient temperatures, or inconsistent degradation of photovoltaic (PV) modules, the unbalanced output power between cascaded H-bridge (CHB) legs will lead to the unbalanced or even distorted grid currents between three phases. This article proposes a novel CHB-based PV grid-tied system integrating centralized energy storage (CHB-PV/ES), which can realize power balanced operation by utilizing the centralized energy storage (ES) interconnecting the CHB three-phase sub-modules (SMs) by isolated DC/DC converter. In addition, the centralized ES group can facilitate the regulation between grid-tied power references and PV power generation, such as stabilizing the power injected into the grid by smoothing the PV power, as well as responding to changes in grid-tied power references. The configuration and security domain of PV and centralized ES SMs are critical factors for CHB-PV/ES, which are thoroughly analyzed in this article to ensure safe system operation. The simulation and experimental results validate the effectiveness of the proposed CHB-PV/ES scheme.
由于太阳辐照度、环境温度的差异或光伏（PV）组件退化的不一致性，级联 H 桥（CHB）支路间不平衡的输出功率将导致三相间不平衡甚至畸变的电网电流。本文提出了一种新型基于 CHB 的光伏并网系统，该系统集成了集中储能（CHB-PV/ES），通过隔离式 DC/DC 转换器将 CHB 三相子模块（SM）与集中储能（ES）互连，从而实现功率平衡运行。此外，集中式 ES 组可促进并网功率基准与光伏发电之间的调节，例如通过平滑光伏功率来稳定注入电网的功率，以及响应并网功率基准的变化。光伏和集中式 ES SM 的配置和安全域是 CHB-PV/ES 的关键因素，本文对此进行了深入分析，以确保系统安全运行。仿真和实验结果验证了所提出的 CHB-PV/ES 方案的有效性。
期刊介绍：
TCAS I publishes regular papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: - Circuits: Analog, Digital and Mixed Signal Circuits and Systems - Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic - Circuits and Systems, Power Electronics and Systems - Software for Analog-and-Logic Circuits and Systems - Control aspects of Circuits and Systems.
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