摘要
光伏并网系统的核心元件是光伏逆变器,其性能直接影响系统的电能质量和稳定性。在弱电网条件下,并网逆变器与电网阻抗交互影响会产生低频振荡[1],同时背景谐波会引起并网电流的畸变,导致并网系统的鲁棒性与稳定性降低。通过分析光伏发电系统接入弱电网时的谐振特性及电网背景谐波特性,以LCL型光伏并网逆变器为研究对象,提出了混合阻尼与电压改进前馈补偿复合控制策略,并且给出了该控制策略的实现过程与方法,可使系统在电网阻抗增加时仍稳定工作,有效减小背景谐波导致的入网电流畸变,保证并网电流满足谐波标准,提高系统鲁棒性和快速动态响应性能,最后通过MATLAB仿真验证了上述控制策略的有效性。
The core component of a photovoltaic grid-connected system is the photovoltaic inverter,whose performance affects the system's power quality and stability.Under weak current network conditions,the interaction between the Grid-tie inverter and grid impedance will produce low-frequency oscillation,and the background harmonics will cause distortion of grid-connected current and cause a decrease in the robustness and stability of grid-connected systems.By analyzing resonance characteristics and background harmonic characteristics of photovoltaic power generation systems that connected weak current grid,taking LCL photovoltaic Grid-tie inverter as a research object,this paper proposes a hybrid damping and voltage improvement feed-forward compensation composite control strategy.It can make the system work stably when the grid impedance increases and effectively reduce the distortion of incoming current caused by background harmonics,ensure grid-connected current meets harmonic standards,and improve system robustness and fast dynamic response performance.Finally,the effectiveness of the above control strategy is verified through MATLAB simulation.
作者
韩杰
姜彤
梁昊
蔡洲
HAN Jie;JIANG Tong;LIANG Hao;CAI Zhou(College of Electrical and Electronic Engineering,North China Electric Power University,Changping Beijing 102206,China)
出处
《计算机仿真》
2025年第3期117-122,共6页
Computer Simulation
基金
江西电力公司科技项目(SGJXDK00DWJS2100110)
国家自然科学基金(51877679)
中国高校基本科研业务费专项基金项目(2011LM32)。
关键词
光伏并网逆变器
混合阻尼
弱电网
前馈补偿
Photovoltaic grid-connected inverter
Mixed damping
Weak grid
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