In this study, a filter-based control scheme is developed for a single-phase grid-connected inverter system with the local load. Improving the quality of the local load voltage in the grid-connected mode and injecting clean current to the grid at the same time is the main objective of the proposed scheme. Moreover, unity power factor at the grid side for different types of the local load is ensured by the proposed controller. Furthermore, this control approach ensures the seamless transfer between grid-connected and stand-alone operation modes without adjusting the controller structure and without any resynchronisation scheme. The proposed scheme is validated by the Lyapunov stability analysis. Moreover, an experimental testbed has been implemented to further validate the controller in the real-time environment, as well as, the performance is compared to a conventional approach.

中文翻译：

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基于滤波器的控制方案提高单相并网逆变器的电能质量

在这项研究中，针对具有局部负载的单相并网逆变器系统，开发了基于滤波器的控制方案。该方案的主要目的是在并网模式下提高本地负载电压的质量并同时向电网注入清洁电流。而且，所提出的控制器确保了电网侧对于不同类型的局部负载的统一功率因数。此外，这种控制方法可确保并网运行模式和独立运行模式之间的无缝转换，而无需调整控制器结构，也无需任何重新同步方案。Lyapunov稳定性分析验证了该方案的有效性。此外，已实施了一个实验性测试平台来进一步验证实时环境中的控制器，以及