Sliding-Mode Observer-Based Grid Voltage-Observation Method with Frequency-Fixed Dual SOGI and Cross-Compensated Phase-Locked Loop

Leilei Guo;Qingyang Ye;Nan Jin;Zhenkun Liu;Zhenjun Wu
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Abstract

Conventional sliding-mode observer (SMO)-based grid-voltage observation methods often require a low-pass filter (LPF) to remove high-frequency sliding-mode noise. However, a complicated phase- and amplitude-compensation method, which is highly sensitive to the DC-offset, is required. A frequency-adaptive dual second-order generalized integrator (SOGI) can be used to replace the LPF, eliminating the compensation link and the effects of the DC-offset; however, strong coupling is introduced between the front-end SOGI block and back-end phase-locked loop (PLL) block, thereby reducing the dynamic performance. To solve this problem, this study proposes an SMO-based grid-voltage observation method with a frequency-fixed dual SOGI and cross-compensated PLL that can eliminate the frequency coupling between the front-end SOGI block and back-end PLL blocks, thereby increasing its dynamic performance. In this study, the phase and amplitude are compensated simultaneously using the proposed cross-compensation method, achieving an accurate observation of the grid voltage under off-nominal frequencies. An analysis of the small-signal model theoretically verified that the proposed method has good dynamic performance. Finally, the superiority of the proposed method is verified through comparative experiments.
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基于滑动模式观测器的电网电压观测方法与频率固定的双 SOGI 和交叉补偿锁相环路
基于滑模观测器(SMO)的传统电网电压观测方法通常需要一个低通滤波器(LPF)来消除高频滑模噪声。然而,这种方法需要复杂的相位和振幅补偿,对直流偏移非常敏感。频率自适应双二阶广义积分器(SOGI)可用于替代 LPF,消除补偿环节和直流偏移的影响;但是,前端 SOGI 模块和后端锁相环(PLL)模块之间会产生强耦合,从而降低动态性能。为解决这一问题,本研究提出了一种基于 SMO 的电网电压观测方法,该方法采用频率固定的双 SOGI 和交叉补偿 PLL,可以消除前端 SOGI 块和后端 PLL 块之间的频率耦合,从而提高其动态性能。在本研究中,利用所提出的交叉补偿方法同时对相位和幅值进行补偿,从而实现了对非标称频率下电网电压的精确观测。对小信号模型的分析从理论上验证了所提出的方法具有良好的动态性能。最后,通过对比实验验证了所提方法的优越性。
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来源期刊
Chinese Journal of Electrical Engineering
Chinese Journal of Electrical Engineering Energy-Energy Engineering and Power Technology
CiteScore
7.80
自引率
0.00%
发文量
621
审稿时长
12 weeks
期刊最新文献
Contents Front Cover Hybrid Modulation Strategy with Voltage Balancing Control for Four-Level Neutral-Point Clamped Converters Design-Oriented Transient Stability Assessment for Droop-Controlled Converter Considering Grid Voltage Phase-Angle Jump Dynamic Reconstruction of Total-Cross-Tied Photovoltaic Array Based on Arrays Using an Improved Dung Beetle Algorithm
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