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Optimal design of LCL filter in grid-connected inverters

机译：并网逆变器中LCL滤波器的优化设计

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摘要

As an essential part in technologies for energy storage systems (ESSs) or renewable energy systems (RESs), grid-connected inverters need power passive filters to meet grid regulations. As typical passive filters, L filter and LCL filter are employed. Although LCL filter is more cost-effective than L filter, a design of LCL filter is more complicated than L filter. LCL filter has three filter elements: inverter-side inductor, grid-side inductor, and filter capacitor. To design the three elements for LCL filter, three or more simultaneous equations should be required, which means that three or more design target should exist. Since conventional design methods for LCL filter do not suggest clear targets and do follow try & error method which cannot be matched exactly with design targets, the conventional methods cannot be optimal design. In this study, a filter inductance ratio to minimise total filter inductance, a filter admittance to meet grid regulation and characteristic impedance for low current stress of switch stack are suggested as design goals. Optimal design equation is proposed to meet the three design goals. The proposed method can solve unique filter elements for LCL filter without iterative try & error. The design method is evaluated through simulation and experiment.
机译：作为储能系统（ESS）或可再生能源系统（RES）技术的重要组成部分，并网逆变器需要功率无源滤波器来满足电网法规。作为典型的无源滤波器，采用L滤波器和LCL滤波器。尽管LCL滤波器比L滤波器更具成本效益，但LCL滤波器的设计比L滤波器更复杂。 LCL滤波器具有三个滤波器元素：逆变器侧电感器，电网侧电感器和滤波电容器。为了设计LCL滤波器的三个元素，需要三个或更多联立方程，这意味着应该存在三个或更多设计目标。由于用于LCL滤波器的常规设计方法没有建议明确的目标，并且遵循了不能与设计目标完全匹配的“试错法”，因此常规方法不能成为最佳设计。在这项研究中，建议将使总滤波器电感最小的滤波器电感比，满足电网调节要求的滤波器导纳和针对开关堆栈低电流应力的特性阻抗作为设计目标。提出了满足三个设计目标的最优设计方程。所提出的方法可以解决LCL滤波器的唯一滤波元素，而无需反复尝试和错误。通过仿真和实验对设计方法进行了评估。

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