摘要
针对离网型风光储联合发电系统中逆变器的谐波抑制问题,提出了一套综合优化策略。分析谐波产生的机理认为,非线性负载和逆变器开关动作是导致谐波的主要原因。为此,采用双闭环控制策略,利用电压内环与电流外环的协同调节,实现了输出电压的动态稳定和电流的畸变抑制。同时,结合单极性倍频SPWM调制技术,通过优化载波频率和调制深度,显著降低了谐波分布的不均匀性,提高了系统的电能质量。此外,提出基于虚拟同步发电机的能量管理与谐波抑制协同优化方法,利用储能系统动态调节功率平衡,进一步提升了系统的稳定性和谐波抑制能力。仿真与实验结果表明,该优化策略在正弦负载和非线性负载条件下均显著降低了总谐波失真(THD),优化后电压THD降至3.5%,电流THD降至4.2%,系统动态响应时间缩短至15 ms以内。与传统方法相比,所提方法实现了对谐波能量的有效分散和抑制,尤其在处理低频与高频谐波方面展现出优越性。
A comprehensive optimization strategy is proposed for harmonic suppression in inverters used in off-grid wind-solar energy storage systems.Nonlinear loads and inverter switching actions are identified as the main sources of harmonics.A dual closed-loop control strategy,coordinating the voltage inner loop and current outer loop,ensures output voltage stability and current distortion suppression.By incorporating unipolar frequency doubling SPWM modulation with optimized carrier frequency and modulation depth,harmonic distribution is improved,enhancing system power quality.A collaborative method based on virtual synchronous generators utilizes energy storage systems for dynamic power balancing,further boosting stability and harmonic suppression.Simulation and experimental results confirm significant reductions in total harmonic distortion(THD):voltage THD decreases to 3.5%,current THD to 4.2%,and dynamic response time improves to under 15 ms.Compared to traditional approaches,this strategy effectively disperses and suppresses harmonic energy,excelling in managing both low-and high-frequency harmonics.
作者
周礼正
王涵
侯文华
李玮
Zhou Lizheng;Wang Han;Hou Wenhua;Li Wei(Liaoning Branch of Huaneng Renewables Co.,Ltd.,Shenyang 110004,China)
出处
《机电工程技术》
2025年第23期153-157,共5页
Mechanical & Electrical Engineering Technology
关键词
离网型风光储联合发电系统
逆变器
谐波抑制
off grid wind solar energy storage combined power generation system
inverter
harmonic suppression
