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Enhanced control of grid-connected inverters with non-linear inductor in LCL filter

机译：LCL滤波器中具有非线性电感器的并网逆变器的增强控制

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摘要

In grid-connected inverters, utilisation of an appropriate output filter is vital to improve power quality. However, the filter, which comprises of capacitor and inductor(s), should be cost effective. In this study, an LCL filter with non-linear inverter-side inductor is used to reduce the filter volume and cost. In order to harness the undesirable non-linear behaviour of the LCL filter's inductor, a new control scheme based on proportional-resonant controller is proposed. The control strategy is based on combinational feedback of inverter-side and grid-side currents, with online adaptive estimation of non-linear inductor. With this scheme, the harmonic compensators' gains can be reduced, while stability margins and dynamic response are improved. Therefore, while a cost-effective filter is used at the inverter output, acceptable total harmonic distortion is achieved. Experimental tests based on a 7 kW digital signal processor controlled prototype inverter are provided to verify the proposed control strategy for grid-connected inverters with LCL output filter benefiting from low-cost non-linear inductor.
机译：在并网逆变器中，使用合适的输出滤波器对于提高电能质量至关重要。但是，由电容器和电感器组成的滤波器应具有成本效益。在本研究中，使用带有非线性逆变器侧电感器的LCL滤波器来减小滤波器的体积和成本。为了利用LCL滤波器电感的非线性特性，提出了一种基于比例谐振控制器的控制方案。该控制策略基于逆变器侧和电网侧电流的组合反馈，以及非线性电感器的在线自适应估计。利用这种方案，可以减少谐波补偿器的增益，同时提高稳定性裕量和动态响应。因此，虽然在逆变器输出端使用了经济高效的滤波器，但仍可以实现可接受的总谐波失真。提供了基于7 kW数字信号处理器控制的原型逆变器的实验测试，以验证所提出的具有低成本低成本电感器的带有LCL输出滤波器的并网逆变器的控制策略。

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