This article proposed a current-sensorless control scheme for the single-phase uninterruptible power supply (UPS) inverter under nonlinear load. Different from the existing current-sensorless literature, the information of load current can be obtained by the designed adaptive laws. It is meaningful for the system’s security and reliability. Under the assumption that the load is a periodic ideal-independent current source, the Fourier series in trigonometric form is expanded to model the unknown disturbance of load current. The observer-based feedback control rate and update laws are derived to adjust online the Fourier coefficients of the load current modeling. Furthermore, the stability of the system is rigorously analyzed via the Lyapunov approach. Under the same limitation of not using the current sensor, comparative experiments are designed. Simulation and experimental results have verified the effectiveness of the control approaches.

中文翻译：

---

非线性负载下单相UPS逆变器基于观测器的自适应控制


本文提出了一种非线性负载下单相不间断电源（UPS）逆变器的无电流传感器控制方案。与现有的无电流传感器文献不同，负载电流的信息可以通过设计的自适应律来获得。这对于系统的安全性和可靠性具有重要意义。假设负载是周期性理想独立电流源，将三角形式的傅里叶级数展开以模拟负载电流的未知扰动。推导出基于观测器的反馈控制率和更新定律，以在线调整负载电流建模的傅立叶系数。此外，通过Lyapunov方法严格分析了系统的稳定性。在不使用电流传感器的相同限制下，设计了对比实验。仿真和实验结果验证了控制方法的有效性。