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首页> 外文期刊>Electric power systems research >Improved sinusoid-locked loop equipped with a virtual stator impedance to estimate the grid voltage parameters
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Improved sinusoid-locked loop equipped with a virtual stator impedance to estimate the grid voltage parameters

机译：改进的正弦锁定环路配备虚拟定子阻抗以估计电网电压参数

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摘要

Grid voltage parameters, including the amplitude, frequency and phase angle, are the essential information for the control and protection of power systems. The sinusoid-locked loop (SLL) is a novel approach to estimate the grid voltage parameters, which achieves accurate estimation and strong robustness in the presence of harmonic disturbances. However, the conventional SLL is sensitive to large voltage variations or computation errors, which may fail to achieve accurate estimation when the controller is trapped in the undesired equilibrium. In this paper, a modified sinusoid-locked loop (MSLL) is designed to improve the estimation performance with respect to large voltage variations. A virtual stator impedance is introduced to eliminate the undesired equilibrium, which mimics the armature reaction of a virtual synchronous machine (VSM). In addition, the closed-loop stability is investigated based on the small-signal model of the proposed MSLL. Following the idea of the VSM, the output voltage of the VSM is locked with the input grid voltage when the real power and reactive power are both driven to zero. Simulation and experimental results are presented to illustrate the effectiveness of the proposed MSLL, which achieves excellent estimation performance in the presence of large voltage variations and harmonic disturbances.
机译：网格电压参数，包括幅度，频率和相位角，是控制和保护电力系统的基本信息。正弦锁定环（SLL）是一种估计电网电压参数的新方法，这在存在谐波干扰的情况下实现了精确的估计和强大的鲁棒性。然而，传统的SLL对大电压变化或计算误差敏感，当控制器被困在不希望的平衡时，这可能无法实现准确估计。在本文中，设计了一种改进的正弦锁定环（MSLL）以改善相对于大电压变化的估计性能。引入虚拟定子阻抗以消除不希望的平衡，这使得虚拟同步机（VSM）的电枢反应模拟。此外，基于所提出的MSLL的小信号模型来研究闭环稳定性。在VSM的思想之后，当实际功率和无功功率均驱动为零时，VSM的输出电压锁定在输入网格电压。提出了模拟和实验结果来说明所提出的MSLL的有效性，这在大电压变化和谐波干扰的存在下实现了出色的估计性能。

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