摘要
为确保光伏发电并网系统稳定运行,针对传统的主动式孤岛检测方法对电能质量影响较大、功率损耗较多等问题,提出一种基于MPPT多级扰动的方法来检测并网光伏系统的孤岛状态。该方法通过周期性多级扰动Boost电路的占空比来减小逆变器的有功输出功率,从而在孤岛状态下使并网点电压低于设定的最小阈值,而在并网状态下对其影响可忽略不计。根据并网点电压大小选择占空比的扰动方式,并根据其值实时计算具体扰动量,可有效降低对电网和用电设备的影响,减小功率损耗。在进行参数设计时,要充分考虑恶劣工况下的检测质量,以消除检测盲区。最后,在不同情况下对所提方法进行仿真测试。结果表明,该方法在减小功率损失、提高孤岛检测效率等方面具有显著优势。
In allusion to the significant impact of traditional active islanding detection methods on power quality and high power loss,a method based on MPPT(maximum power point tracking)multi-level disturbance is proposed to detect islanding state in photovoltaic grid-connected systems,so as to ensure the stable operation of the photovoltaic grid-connected system.This method can reduce the active output power of the inverter by periodically perturbing the duty cycle of the Boost circuit at multiple levels,so that the node voltage is lower than the set minimum threshold in the islanding state,and the influence on it is negligible in the grid-connected state.The disturbance mode of duty cycle is selected according to the voltage at grid-connected point,and the specific disturbance is calculated in real time according to its value,which can effectively reduce the influence on the power grid and electrical equipment and reduce the power dissipation.In the parameter design,the detection quality under harsh working conditions is considered fully,and the blind area of detection is eliminated.The simulation testing of the proposed method is conducted under different conditions.The results show that this method has significant advantages in reducing power dissipation and improving islanding detection efficiency.
作者
李学举
武鹏
陈俊伟
陈蓓
LI Xueju;WU Peng;CHEN Junwei;CHEN Bei(College of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《现代电子技术》
北大核心
2024年第20期81-86,共6页
Modern Electronics Technique
基金
国家自然科学基金项目:Markov跳跃系统柔性调度与控制优化设计(62173222)。
关键词
孤岛检测
MPPT多级扰动
光伏并网系统
光伏发电
微网
功率损耗
islanding detection
MPPT multi-level disturbance
photovoltaic grid-connected system
photovoltaic power generation
microgrid
power dissipation
作者简介
李学举(1999-),男,山东济宁人,硕士研究生,研究方向为电力电子与光伏发电并网技术;通讯作者:武鹏(1982-),男,山东枣庄人,博士研究生,副教授,研究方向为新能源并网稳定性分析,并网逆变器设备的研发。
