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基于无源性的即插即用电流控制并网逆变器设计

Passivity-Based Design of Plug-and-Play Current-Controlled Grid-Connected Inverters

语言:

中文摘要

本文针对LCL滤波并网逆变器,研究了数字控制延迟及电网阻抗变化对系统稳定性的影响。针对电流控制中因计算和PWM延迟导致的负阻尼效应,提出了一种基于无源性的控制设计方法,旨在实现逆变器在弱电网条件下的稳定并网运行。

English Abstract

Stable operation of LCL filtered grid-connected inverters can be achieved using active damping. However, the stability can be threatened by non-ideal conditions such as delay in digitally controlled systems and grid impedance variation at the point of common coupling (PCC). In a grid-side current controlled inverter, the computational and pulsewidth modulation delays cause an unintentionally negat...
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SunView 深度解读

该研究直接服务于阳光电源组串式及集中式光伏逆变器在复杂电网环境下的稳定性优化。随着全球光伏渗透率提升,弱电网场景日益增多,基于无源性的控制策略能有效解决数字延迟带来的谐振问题,提升逆变器在电网阻抗波动下的鲁棒性。建议研发团队将此无源性设计准则集成至iSolarCloud智能运维平台的仿真模型中,并应用于新一代组串式逆变器的控制算法升级,以增强产品在弱电网下的并网适应能力,减少现场谐振故障。