Global accurate estimation of positive- and negative-sequence voltage components for variable frequency AC systems
Global accurate estimation of positive- and negative-sequence voltage components for variable frequency AC systems
复制标题
变频交流系统正序和负序电压分量的全局精确估计
DOI：
10.1049/iet-pel.2017.0503
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发表时间：
2018
影响因子：
2
通讯作者：
Zhang Juxiang
中科院分区：
文献类型：
--
作者：
Dai Zhiyong;Lv Shuaishuai;Mwaniki Julius K;Zhang Juxiang
在这项研究中，提出了一种基于全局观测器的方法，用于多电飞机（MEA）的变频交流系统，以估计正序和负序分量及其参数。将可测电网电压视为含有未知系数-电压频率的参数化系统，建立了基于三相电网电压的数学模型。根据所得到的动态模型，设计全局观测器，实现对正序和负序电压分量及其频率、幅值和相角的零稳态误差估计。与大多数针对恒频交流电网开发的仅具有局部收敛性的现有方法不同，本文提供的基于李雅普诺夫的参数证明表明，所提出的观测器能够在理论上实现全局渐近收敛。同时，该全局观测器方法在MEA变频交流电网中具有更好的稳定性和更快的动态性能。仿真和实验结果验证了所提出的全局观测器方案。
In this study, a global observer‐based method is proposed for variable frequency AC systems of more electric aircraft (MEA) to estimate positive‐ and negative‐sequence components and their parameters. Looking at the measurable grid voltage as a parameterised system containing the unknown coefficient – voltage frequency, a mathematical model based on three‐phase grid voltage is established. According to the obtained dynamic model, a global observer is developed to achieve the estimation of positive‐ and negative‐sequence voltage components and their frequency, amplitudes and phase angles with zero steady‐state error. Different from most existing methods which are developed for constant frequency AC grids and only have local convergence, a Lyapunov‐based argument proof provided in this study shows that the proposed observer is able to achieve global asymptotic convergence in theoretical sound. Also, it ensures that the addressed global observer method has a better stability and faster dynamic performance for variable frequency AC grids of MEA. Both simulations and experimental results are provided to validate the proposed global observer scheme.