Design of a robust current controller for grid‐connected photovoltaic systems based on cascaded multilevel inverter
Design of a robust current controller for grid‐connected photovoltaic systems based on cascaded multilevel inverter
复制标题
基于级联多电平逆变器的并网光伏系统鲁棒电流控制器设计
DOI：
10.1049/iet-rpg.2019.0526
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发表时间：
2020
影响因子：
2.6
通讯作者：
Bernardo Pinheiro de Alvarenga
中科院分区：
文献类型：
--
作者：
Andre Felicio de Sousa Silva;Sergio Pires Pimentel;E. G. Marra;Bernardo Pinheiro de Alvarenga
提出了一种适用于单相光伏并网系统的鲁棒状态反馈H-∞并网电流控制器的设计方法。即使在处理电网电压失真等电能质量问题的情况下，该方法也达到了较高的系统可靠性。在一阶输出滤波器存在参数不确定性的情况下，验证了H-∞控制器的鲁棒性，并获得了令人满意的干扰抑制性能。所提出的设计基于线性矩阵不等式，涉及H-∞优化和在连续时间域上的极点配置分析。还给出了离散时间分析，以表明用微控制器或类似设备实现它的简单性。在此基础上，为了验证所提控制器的有效性，将其与两种常用的线性控制方法进行了比较：经典PI控制器的鲁棒性，以及考虑与电网设施连接点的电能质量的鲁棒H∞谐振控制器。虽然这些结论是关于低压光伏并网多电平功率变流器的，但所提出的H∞控制设计(及其概念)可以应用于各种可再生能源系统。
This work proposes a design method for robust state feedback H ∞ grid current controller applied to single-phase grid-connected photovoltaic (PV) systems. The proposed method achieved high system reliability even dealing with grid distorted voltages and other power quality issues. The robustness of the H ∞ controller was verified in the face of parametric uncertainties at the first-order output filter, and also a satisfactory disturbance rejection performance was achieved. The proposed design is based on linear matrix inequalities associated with constraints involving H ∞ optimisation and a pole placement analysis on the continuous-time domain. A discrete-time analysis is also presented in order to indicate the simplicity of its implementation by a microcontroller or similar devices. Based on the presented results and in order to validate the proposed controller, its robust performance was compared with two linear and well-known control methods: a classical PI controller, in terms of robustness; and a robust H ∞ resonant controller, regarding the power quality at the connection point with the grid-utility. Although the conclusions were listed regarding a low voltage PV grid-interactive multilevel power converter, the proposed H ∞ control design (and its concepts) can be applied to a great variety of renewable energy resources systems.