A Global Convergence Estimator of Grid Voltage Parameters for More Electric Aircraft
A Global Convergence Estimator of Grid Voltage Parameters for More Electric Aircraft
复制标题
多电动飞机电网电压参数的全局收敛估计器
DOI：
10.1109/tie.2019.2944087
复制
发表时间：
2020-09
影响因子：
7.7
通讯作者：
Zhang Zhen
中科院分区：
文献类型：
--
作者：
Dai Zhiyong;Yang Jianwei;Rao Dingjia;Zhang Juxiang;Zhang Zhen
锁相环广泛应用于单相和三相电力系统的并网同步。然而，这些基于锁相环的方法通常是针对恒频网格而设计的，并且这些方法在较小的局部区域(即锁相区)内具有快速的动态特性和良好的精度。在电网频率变化范围较大(360-800 Hz)的多架电动飞机(MEA)电网中应用这些锁相环时，其动态响应和稳态精度都会显著降低。有鉴于此，本文提出了一种估计MEA电力系统电网电压频率、正序和负序分量的全局收敛方法。通过分析直流偏置分量和电网电压及其导数之间的关系，建立了直流偏置分量和电网频率未知参数的数学模型。在此基础上，提出了一种全局估计器来准确估计电网电压参数。基于Lyaponov的证明确保了所提出的估计器是全局收敛的，并且具有完全消除直流偏移影响的能力。实验结果验证了该估计器的有效性。
Phase-locked loops (PLLs) are widely popular in applications of grid synchronization for single- and three-phase utility power systems. However, these PLL-based methods are usually designed for constant frequency grids and these schemes only have fast dynamics and good accuracy in a small local region (i.e., phase-locked region). When applying these PLLs in the grids of more electric aircraft (MEA), in which the grid frequency varies in a wide range (360–800 Hz), both the dynamic response and the steady-state accuracy of PLLs reduce significantly. In light of this, this article presents a global convergence method to estimate the frequency, positive- and negative-sequence components of grid voltage in MEA power systems. By analyzing the relationship between the DC-offset component, the grid voltage, and their derivatives, a mathematic model with the unknown parameters, which are the DC-offset component and the grid frequency, is established. Accordingly, a global estimator is proposed to estimate the grid voltage parameters accurately. A Lyaponov-based argument ensures that the proposed estimator is global convergent and it has the capability to eliminate the DC offset effect completely. The experimental results are provided to verify the effectiveness of the proposed estimator.
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影响因子：
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DOI：
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