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首页> 外文会议>IEEE Applied Power Electronics Conference and Exposition >A hybrid CHB multilevel inverter with supercapacitor energy storage for grid-connected photovoltaic systems
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A hybrid CHB multilevel inverter with supercapacitor energy storage for grid-connected photovoltaic systems

机译：具有超级电容器储能功能的混合式CHB多级逆变器，用于并网光伏系统

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This paper presents a single-phase cascaded H-bridge multilevel photovoltaic inverter containing a special supercapacitor cell. The cascaded H-bridge multilevel topology enables independent DC voltage control for each PV panel or string to meet the requirements of distributed maximum power point tracking, which reduces the efficiency loss caused by panel mismatch and unequal sheltering. But as the total power of distributed grid-connected photovoltaic inverter increases, the power fluctuation brought by those photovoltaic systems will become serious and even affect the stability of the grid. To alleviate this problem, a supercapacitor cell is added to the inverter. It not only smooths the PV inverter's output power fluctuation, but also increases the inverter's output level. For the coordination of these two kinds of cells, a control strategy is proposed, in which all cascaded PV cells only output active power, and the supercapacitor cell undertakes the reactive active power and compensates the active power fluctuations. Experimental results are presented to verify the feasibility of the proposed approach. The fluctuations in the output power are effectively smoothed, and the inverter gets unity power factor.
机译：本文提出了一种包含特殊超级电容器单元的单相级联H桥多电平光伏逆变器。级联的H桥多级拓扑可为每个PV面板或灯串提供独立的DC电压控制，以满足分布式最大功率点跟踪的要求，从而减少了因面板不匹配和不平等遮蔽而导致的效率损失。但是随着分布式并网光伏逆变器总功率的增加，这些光伏系统带来的功率波动将变得严重，甚至影响电网的稳定性。为了减轻该问题，将超级电容器单元添加到逆变器。它不仅可以平滑光伏逆变器的输出功率波动，而且可以提高逆变器的输出水平。为了协调这两种电池，提出了一种控制策略，其中所有级联的PV电池仅输出有功功率，而超级电容器电池承担无功有功功率并补偿有功功率波动。实验结果表明，验证了该方法的可行性。有效地消除了输出功率的波动，并且逆变器获得了统一的功率因数。

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