Phase-Shifted Energy Balance Control for Multilevel Inverters in Grid-Connected PV Systems
Phase-Shifted Energy Balance Control for Multilevel Inverters in Grid-Connected PV Systems
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DOI：
10.3390/electronics12122582
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发表时间：
2023-06
期刊：
影响因子：
2.9
通讯作者：
Lei Wang;Lidan Chen;Weiqiang Ye;Wei Ma
中科院分区：
文献类型：
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作者：
Lei Wang;Lidan Chen;Weiqiang Ye;Wei Ma
级联多电平转换器是并网光伏系统的有希望的候选者，但直流链路中可能存在低频纹波。这种涟漪不仅是固有的，而且是内在的。它们的发生可能是由于环境因素造成的，例如光伏发电的辐照度在一定范围内的变化。为了解决这个问题，本文提出了一种用于光伏（PV）系统并网级联多电平逆变器的时钟相移（CPS）能量平衡控制方法。所提出的控制方案可以防止直流链路的低频纹波传播到电网。而且原理上是可行的，不需要调整控制参数。仿真和实验结果验证了该方法的有效性和可行性。
Cascaded multilevel converters are promising candidates for grid-connected PV systems, but low-frequency ripples may exist in a DC link. Such ripples are not just inherent; they can occur due to environmental factors, such as variations in a certain range of irradiance of the PV. To address this issue, this article proposes a clock phase-shifted (CPS) energy balance control method for grid-connected cascaded multilevel inverters for photovoltaic (PV) systems. The proposed control scheme can prevent the low-frequency ripple of the DC link propagating to the power grid. Furthermore, it is feasible in principle and no adjustment of the control parameters is needed. The simulation and experimental results verify the effectiveness and feasibility of the proposed approach.