A Multivariable Controller in Synchronous Frame Integrating Phase-Locked Loop to Enhance Performance of Three-Phase Grid-Connected Inverters in Weak Grids
A Multivariable Controller in Synchronous Frame Integrating Phase-Locked Loop to Enhance Performance of Three-Phase Grid-Connected Inverters in Weak Grids
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DOI：
10.1109/tpel.2022.3164878
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发表时间：
2022-09
影响因子：
6.7
通讯作者：
Sushil Silwal;Masoud Karimi Ghartemani;H. Karimi;M. Davari;Milad Hoseini Zadeh
中科院分区：
文献类型：
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作者：
Sushil Silwal;Masoud Karimi Ghartemani;H. Karimi;M. Davari;Milad Hoseini Zadeh
本文提出了一种同步参考系中的新型电流控制器及其相关设计，用于增强三相并网逆变器的性能，特别是在弱电网条件下。现有控制器在高阻抗电网条件下表现不佳，并且由于同步和控制单元之间的相互作用而导致振荡和不稳定问题。所提出的控制器通过以下方式解决了这个问题：1）推导三相锁相环（PLL）的线性模型，2）将PLL模型集成到电流控制器设计中，3）使用多输入多输出系统的多变量控制设计，以及4）使用最优线性二次理论设计控制器增益。与传统控制器相比，所提出的控制器在更广泛的弱电网条件下具有优越的性能。为了验证和揭示所提出的控制器的理想性能，提出了广泛的仿真和实验结果。
This article presents a new current controller in the synchronous reference frame and its associated design for enhancing the performance of three-phase grid-connected inverters, especially against weak-grid conditions. The existing controllers do not perform strongly during high-impedance grid conditions and lead to oscillations and instability issues due to the interactions between the synchronization and control units. The proposed controller addresses this issue by 1) deriving a linear model of the three-phase phase-locked loop (PLL), 2) integrating the PLL model into the current controller design, 3) using a multivariable control design for multi-input multi-output systems, and 4) designing the controller gains using optimal linear quadratic theory. The proposed controller has superior performance over a substantially wider range of weak-grid conditions compared to conventional controllers. Extensive simulation and experimental results are presented in order to validate and reveal the desirable performance of the proposed controller.