State estimation of power grid under smart grid integration based on FFCD-SOGI-PLL

Q3 Engineering

西北工业大学学报 Pub Date : 2022-12-01 DOI:10.1051/jnwpu/20224061343

Xiangyu Zhou, Zhen Zhang, Ruiqing Ma, Chun-Yi Wu, Yong-man Lu, Kang Xiangli, Danqing Wang

引用次数: 0

Abstract

在智能电网与新能源发电融合背景下, 电力电子接口装置的大量使用将给系统引入额外的直流偏置。因此, 电网电压信息获取算法的直流偏置抑制能力变得至关重要。二阶广义积分器锁相环(SOGI-PLL)广泛应用于电网信息的同步与提取, 可以有效抑制频率波动和相位跳变对电网状态估计精度的影响, 但其自适应频率反馈环节在实现谐波抑制的同时, 对于电网中含有的直流偏置非常敏感。针对这一问题, 提出了一种固定频率反馈的级联SOGI-PLL(FFCD-SOGI-PLL), 使用级联结构输入固定电网标称频率, 实现信号直流分量滤除, 增强了谐波抑制性能。通过小信号模型给出其稳定性分析和参数设计方法。实验结果表明, 在电网电压含有直流分量、谐波以及电网电压跌落时, 设计的FFCD-SOGI-PLL可以快速稳定地对电网电压状态信息进行精确估计。

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基于FFCD-SOGI-PLL的智能电网集成下电网状态估计

In the context of the integration of smart grids and new energy generation, the widespread use of power electronic interface devices will introduce additional DC bias to the system. Therefore, the DC bias suppression ability of the grid voltage information acquisition algorithm has become crucial. The second-order generalized integrator phase-locked loop (SOGI-PLL) is widely used in the synchronization and extraction of power grid information, which can effectively suppress the impact of frequency fluctuations and phase jumps on the accuracy of power grid state estimation. However, its adaptive frequency feedback loop is very sensitive to DC bias contained in the power grid while achieving harmonic suppression. A cascaded SOGI-PLL (FFCD-SOGI-PLL) with fixed frequency feedback is proposed to address this issue. The cascaded structure is used to input the nominal frequency of the fixed power grid, achieving signal DC component filtering and enhancing harmonic suppression performance. Provide stability analysis and parameter design methods through small signal models. The experimental results show that when the power grid voltage contains DC components, harmonics, and voltage drops, the designed FFCD-SOGI-PLL can quickly and stably accurately estimate the voltage state information of the power grid.

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