<br>基于三相广义坐标变换的三桥臂、四桥臂混合并联逆变器下垂控制,IEEE Transactions on Power Electronics

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基于三相广义坐标变换的三桥臂、四桥臂混合并联逆变器下垂控制
IEEE Transactions on Power Electronics ( IF 6.6 ) Pub Date : 2024-08-16 , DOI: 10.1109/tpel.2024.3443882
Guangjun Tan ₁ , Yixing Zheng ₁ , Wei Zhao ₁ , Lei Qi ₁ , Xiaofeng Sun ₁

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近年来，三桥臂逆变器得到了广泛采用。然而，通常需要三相四线逆变器为微电网环境中的不对称负载提供中性连接。本文提出了三桥臂和四桥臂混合逆变器并联结构来解决上述问题。目的是满足不对称负载条件下的四线要求并减轻电压不平衡问题。本文首先研究了三桥臂逆变器和四桥臂逆变器的输出电压平衡控制以及混合并联系统的控制技术。通过计算不对称负载条件下逆变器的输出功率，识别了不平衡条件下传统功率下垂控制和虚拟阻抗控制的缺陷。为了解决这些问题，本文采用平均功率下降并提出了一种新颖的虚拟阻抗方法。该方法考虑了线路阻抗差异对有功功率和不平衡负载电流分配精度的影响，有效提高了其分配精度。四桥臂逆变器将三桥臂逆变器和四桥臂逆变器并联，可以显着降低公共负载端的零序电压，增强三相电压平衡。最后，实验结果验证了改进的虚拟阻抗控制的可行性和有效性。

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Droop Control of Three- and Four-Leg Hybrid Parallel Inverters Based on Three-Phase Generalized Coordinate Transformation

In recent years, widespread adoption of three-leg inverters has been observed. However, there is often a need for three-phase four-wire inverters to provide a neutral connection for asymmetrical loads within microgrid contexts. This article proposes a three- and four-leg hybrid inverter parallel structure to address the above issues. The aim is to fulfill the four-wire requirement under asymmetrical load conditions and mitigate the voltage unbalance problem. The article begins by investigating the output voltage balance control of three- and four-leg inverters and the control techniques of the hybrid parallel system. Deficiencies in traditional power droop control and virtual impedance control under unbalanced conditions are identified by calculating the inverter's output power under asymmetric load conditions. To address these issues, the article adopts average power droop and proposes a novel virtual impedance method. This method considers the impact of line impedance differences on the distribution accuracy of active power and unbalanced load current, effectively improving their distribution accuracy. Connecting three- and four-leg inverters in parallel, the four-leg inverter is capable of significantly reducing the zero-sequence voltage of the common load terminal and enhances three-phase voltage balance. Finally, experimental results validate the feasibility and effectiveness of the improved virtual impedance control.

更新日期：2024-08-16

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