This article investigates output voltage tracking control, and harmonic distortion suppression in single-phase voltage-source uninterruptible power supply (UPS) inverters with an $LC$ -filter. The control scheme is based on sensing the output voltage across the UPS load, and using the voltage tracking error in a feedback loop of the internal model principle (IMP) framework. A robust controller is designed to drive $LC$ -filter to operate with an adjustable amplitude, and adaptive resonant frequency. Specifically, the proposed controller basically employs an internal model with a filter to examine the incremental dynamics of the voltage tracking error, and regulate the voltage modulating signal in sine pulse width modulation (SPWM). With such a stable operation of the controlled UPS system, the inverter is able to achieve fast dynamics of voltage tracking, which results in the minimum harmonics while approaching the zero-error steady state under the external loads. The Matlab/Simulink simulation, and experimental validation are both provided for the prototype controlled UPS inverter under the closed-loop operation. It is shown that the controller offers improved performance over the existing schemes. By merely using the voltage error to adjust the output voltage, the controlled inverter produces nearly perfect sinusoidal voltage at moderate switching frequency under a wide range of filter parameters, and consequently, the UPS operation has excellent dynamic response with both high voltage utilization of the DC source, and high power quality.

中文翻译：

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具有SPWM实现的单相UPS逆变器鲁棒输出电压跟踪控制的内模原理方法

本文研究了具有以下特性的单相电压源不间断电源（UPS）逆变器中的输出电压跟踪控制和谐波失真抑制 $ LC $ -筛选。该控制方案基于感测UPS负载两端的输出电压，并在内部模型原理（IMP）框架的反馈环路中使用电压跟踪误差。强大的控制器旨在驱动$ LC $ -滤波器以可调的幅度和自适应谐振频率工作。具体而言，所提出的控制器基本上采用带有滤波器的内部模型来检查电压跟踪误差的动态变化，并在正弦脉冲宽度调制（SPWM）中调节电压调制信号。借助受控UPS系统的这种稳定运行，逆变器能够实现电压跟踪的快速动态变化，从而在外部负载下达到零误差稳态的同时，将谐波降至最低。Matlab / Simulink仿真和实验验证均在闭环操作下为原型控制的UPS逆变器提供。结果表明，与现有方案相比，该控制器具有更高的性能。仅使用电压误差 为了调节输出电压，受控逆变器在各种滤波器参数范围内，以适当的开关频率产生接近理想的正弦电压，因此，UPS运行具有出色的动态响应，既具有直流电源的高电压利用率，又具有高电能质量。