Performance and Stability Analysis of Enhanced Lyapunov Function and Predictive Voltage Control with Active Damping for Single-Phase PV/Grid Electric Power System

IF 1.5 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Iranian Journal of Science and Technology-Transactions of Electrical Engineering Pub Date : 2024-01-07 DOI:10.1007/s40998-023-00686-7
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Abstract

As the world increasingly turns to renewable energy sources, the integration of solar photovoltaic (PV) systems into the grid has emerged as a pivotal solution. Effective control methods are paramount to harnessing the full potential of these grid-connected PV systems. While existing control methods have laid a foundation, there persists a compelling need for innovative approaches capable of surpassing the limitations of conventional methods. This paper introduces a novel nonlinear control approach utilizing an enhanced Lyapunov function for a single-phase PV/grid electric power system. High-performance operation of the solar PV system, interfacing with a grid-connected single-stage inverter, is achieved through the control of maximum PV voltage using predictive voltage control for MPPT. The enhanced Lyapunov function maintains PV voltage stability at the dc-bus by treating the difference between PV voltage and its reference as a controlled state error. Notably, this approach ensures the stability of the closed-loop PV system even under varying solar irradiances. To achieve full active power injection into the grid with high quality, the proposed enhanced Lyapunov function is augmented by integrating an LCL filter with virtual resistance as an active damping circuit for grid current feedback control. This integration introduces an opposing current to the grid-side inductance current. This compensation mechanism corrects the q-axis grid current using the dq-SRF mathematical model of the global PV/grid system. The LCL parameters and virtual resistance design methods are provided. The effectiveness of the enhanced Lyapunov function is demonstrated through simulations using MATLAB/Simulink software. The results showcase outstanding performance when compared to conventional Lyapunov function and sliding mode control strategies in achieving key objectives, including zero state errors, global stability, and the generation of a sinusoidal grid current signal with low total harmonic distortion and the unit power factor at the point of common coupling.

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单相光伏/电网电力系统的增强型 Lyapunov 函数和带主动阻尼的预测电压控制的性能和稳定性分析
摘要 随着全球越来越多地转向可再生能源,太阳能光伏(PV)系统并入电网已成为一个关键的解决方案。要充分利用这些并网光伏系统的潜力,有效的控制方法至关重要。虽然现有的控制方法已经奠定了基础,但仍然迫切需要能够超越传统方法局限性的创新方法。本文介绍了一种新型非线性控制方法,该方法利用增强型 Lyapunov 函数来控制单相光伏/并网发电系统。通过使用预测电压控制 MPPT 来控制最大光伏电压,实现了与并网单级逆变器连接的太阳能光伏系统的高性能运行。增强型 Lyapunov 函数将光伏电压与其参考电压之间的差值视为受控状态误差,从而保持直流母线上光伏电压的稳定性。值得注意的是,即使在太阳辐照度变化的情况下,这种方法也能确保闭环光伏系统的稳定性。为了高质量地向电网注入全部有功功率,通过集成具有虚拟电阻的 LCL 滤波器作为电网电流反馈控制的有源阻尼电路,增强了所提出的增强型 Lyapunov 函数。这种集成为电网侧电感电流引入了一个相反的电流。这种补偿机制利用全球光伏/电网系统的 dq-SRF 数学模型修正 q 轴电网电流。提供了 LCL 参数和虚拟电阻设计方法。通过使用 MATLAB/Simulink 软件进行仿真,证明了增强型 Lyapunov 函数的有效性。结果表明,与传统的 Lyapunov 函数和滑动模式控制策略相比,该方法在实现关键目标方面具有出色的性能,包括零状态误差、全局稳定性,以及在共耦点产生具有低总谐波失真和单位功率因数的正弦电网电流信号。
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来源期刊
CiteScore
5.50
自引率
4.20%
发文量
93
审稿时长
>12 weeks
期刊介绍: Transactions of Electrical Engineering is to foster the growth of scientific research in all branches of electrical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in electrical engineering as well as applications of established techniques to new domains in various electical engineering disciplines such as: Bio electric, Bio mechanics, Bio instrument, Microwaves, Wave Propagation, Communication Theory, Channel Estimation, radar & sonar system, Signal Processing, image processing, Artificial Neural Networks, Data Mining and Machine Learning, Fuzzy Logic and Systems, Fuzzy Control, Optimal & Robust ControlNavigation & Estimation Theory, Power Electronics & Drives, Power Generation & Management The editors will welcome papers from all professors and researchers from universities, research centers, organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.
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