基于有源阻抗重构装置的并联并网逆变系统稳定性策略
摘要：为了提高分布式并联并网逆变器之间的稳定性和抗电网干扰的能力，首先提出一种广义阻抗模型来表征多并联并网逆变器系统的稳定性，接着提出一种有源阻抗重构策略来增加逆变器的输出阻抗：广义阻抗模型将复杂的传递函数矩阵分解为逆变器输出阻抗矩阵和电网阻抗矩阵，并从理论上推导出更高的逆变器输出阻抗，以增强系统的稳定性和抗电网干扰能力。为验证该方法的有效性，采用16台单相逆变器并联系统进行仿真，并搭建2台并联的并网逆变器平台进行实验。仿真和实验结果证明，所提出的方法能够有效地提高并联并网逆变器系统的稳定性。
Abstract:To improve the stability among distributed grid-connected parallel inverters and the ability to resist the interference from power grid, firstly, a generalized impedance model was proposed to characterize the stability of grid-connected multi parallel inverter system. Secondly, an active impedance reconfiguration strategy was put forward to increase the output impedance of the inverter. Thirdly, the complicated transfer function matrix was decomposed into output impedance matrix of the inverter and the impedance matrix of power grid by the generalized impedance model, and the higher inverter output impedance was derived theoretically to enhance the stability of the inverter system and its ability to resist the interference from power grid. To verify the correctness of the proposed method, a parallel inverter system composed by sixteen single-phase inverters was utilized to the simulation, and two parallel grid-connected inverter platforms were constructed for the experiment. Both results from simulation and experiments show that using the proposed method the stability of parallel grid-connected inverter system can be effectively enhanced.
标题：基于有源阻抗重构装置的并联并网逆变系统稳定性策略
英文标题：Stability Strategy of Parallel Grid-connected Inverter System Based on Active Impedance Reconstruction Device
作者：杨晓雷, 严耀良, 张思, 杭丽君, 闫东, 韩其国, 何远彬, 陶欢,
关键词：LCL逆变器, 稳定性, 广义阻抗模型, 有源阻抗重构装置,
发表日期：2023-04-10
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