Hadi Husam Ali, Kassem Abdallah, Amoud Hassan, Nadweh Safwan
Ecole Doctoral, Lebanese University, Lebanon.
FE, ECCE, Notre Dame University, Lebanon.
Heliyon. 2024 Oct 28;10(21):e39757. doi: 10.1016/j.heliyon.2024.e39757. eCollection 2024 Nov 15.
As the world increasingly focuses on renewable energy sources, grid-connected PV systems will continue to play a critical role in meeting our energy needs. This integration has brought many benefits, but has also created various problems related to power quality and stability at the connection points. Various techniques are used to improve the power quality, such as passive filters, tuned passive harmonic filters, and active filters. This paper presents the use of a series active filter on the DC side of grid-connected PV systems to improve their power quality, stability, and dynamic performance. The proposed filter consists of an inductor, two capacitors, and four transistor-diode pairs, the operation of which is controlled by a sinusoidal pulse width modulation (SPWM) scheme. The MATLAB/Simulink is used to build and validate a comprehensive mathematical model of the studied system. The transfer function of the system is identified and its transient response is studied under various test input signals. A Bode plot is also generated to assess the impact of the integration of this component on the stability of the system. The results showed that incorporating the filter resulted in a significant reduction in the total harmonic distortion factor (Thd%) for both the voltage and current waves at the inverter output. Moreover, it improved the transient response characteristics of the system by significantly reducing the maximum overshoot value of the system response with respect to the test input signals. The results indicate that the stability of the system is improved after the filter addition, as evidenced by the increased gain margin and phase margin in the system Bode plot.
随着世界越来越关注可再生能源，并网光伏系统将继续在满足我们的能源需求方面发挥关键作用。这种整合带来了许多好处，但也在连接点处产生了与电能质量和稳定性相关的各种问题。人们使用了各种技术来改善电能质量，如无源滤波器、调谐无源谐波滤波器和有源滤波器。本文介绍了在并网光伏系统的直流侧使用串联有源滤波器来提高其电能质量、稳定性和动态性能。所提出的滤波器由一个电感、两个电容和四对晶体管 - 二极管组成，其运行由正弦脉宽调制（SPWM）方案控制。使用MATLAB/Simulink构建并验证了所研究系统的综合数学模型。确定了系统的传递函数，并在各种测试输入信号下研究了其瞬态响应。还生成了伯德图以评估该组件的集成对系统稳定性的影响。结果表明，加入滤波器后，逆变器输出处电压和电流波形的总谐波失真因数（Thd%）显著降低。此外，它通过相对于测试输入信号显著降低系统响应的最大超调值，改善了系统的瞬态响应特性。结果表明，添加滤波器后系统的稳定性得到了改善，这在系统伯德图中增益裕度和相位裕度的增加中得到了证明。
