Optimal LQR-based multi-loop linear control strategy for UPS inverter applications using resonant controller
Optimal LQR-based multi-loop linear control strategy for UPS inverter applications using resonant controller
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使用谐振控制器的 UPS 逆变器应用的基于 LQR 的最佳多环线性控制策略
DOI：
10.1109/cdc.2011.6161192
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H. Mokhtari
中科院分区：
文献类型：
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作者：
A. Hasanzadeh;C. Edrington;B. Maghsoudlou;H. Mokhtari
针对采用电压源逆变器（VSI）和LC滤波器的不间断电源（UPS）系统，提出了一种多环控制的优化结构。谐振控制器确保跟踪正弦参考电压和抑制正弦电流干扰，如果环路保持稳定，则没有稳态误差。所面临的挑战是减少输出总谐波失真（THD），提高LC谐振频率的阻尼，并防止产生快速闭环模式，这些模式超出了具有有限开关频率的逆变器的频率范围。提出了一种扩展的经典线性二次型调节器（LQR）解决最优跟踪问题。本文还提出了一种改进的控制器，以进一步减少高精度应用的电压失真。所设计的控制器进行了模拟，也实验建立和结果，以确认分析推导。
This paper presents an optimal multi-loop control structure for uninterruptible power supply (UPS) applications which use voltage source inverter (VSI) coupled with LC filter. A resonant controller ensures tracking of sinusoidal voltage reference and rejection of sinusoidal current disturbance with no steady-state error if the loop remains stable. The challenges are reduction of output total harmonic distortion (THD), improving damping of the LC resonance frequency and preventing generation of fast closed-loop modes which go beyond the frequency range of inverter with limited switching frequency. An extension of the classic linear quadratic regulator (LQR) is proposed which addresses the optimal tracking problem. The paper also presents an improved controller to further reduce the voltage distortions for highly accurate applications. The designed controller is simulated and also experimentally built and the results are presented to confirm analytical derivations.