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基于状态重构准谐振扩张状态观测器的LCL型并网逆变器电流控制策略研究

Research on Current Control Strategy of the LCL-Type Grid-Connected Inverter Based on State Reconfiguration With Quasi Resonant-Extended State Observer
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摘要 LCL型并网逆变器是分布式发电与电网实现能量双向流动的重要装置,其电流控制方法通常需要多个电压电流传感器实现有源阻尼及并网电流控制,而这会增加系统成本。提出一种基于状态重构准谐振扩张状态观测器的全状态观测系统,只需一个逆变器侧电感电流传感器即可实现对所需状态变量的实时观测。通过在扩张状态观测器中每个状态变量的观测通道添加准谐振环节,解决传统扩张状态观测器跟踪正弦信号需要高观测器增益问题。同时,针对在dq轴坐标系下的并网电流控制存在强耦合问题,设计了将耦合项作为总扰动当中一部分的自抗扰电流控制器,简化了传统电流控制当中复杂的解耦过程。软件数值仿真结果表明,该控制策略表现出良好的观测效果及电流跟踪效果。 The LCL-type grid-connected inverter(GCI)is a critical device for realizing energy transmission between distributed generation and the power grid.The current control of the GCI typically requires multiple sensors to enable active damping and grid-side current control,which increases the system cost.A full-state observation system based on state reconfiguration with quasi resonant-extended state observer was proposed,in which just a signal inverter-side inductor current sensor was required to realize real-time observation of the desired state variables.Meanwhile,the constraint of high observer bandwidth required for conventional extended state observer to track sinusoidal signals was solved by adding a quasi resonant link to the observation channel of each state variable of extended state observer.Moreover,the active disturbance rejection control current controller was designed in the dq frame,which simplified the complicated decoupling process of conventional methods by treating the coupling as part of the total disturbance.The software numerical simulation illustrates that the control strategy show excellent observation results and current tracking performance.
作者 方健 李辉 FANG Jian;LI Hui(College of Automation Engineering,Shanghai University of Electric Power,Yangpu District,Shanghai 200090,China)
出处 《发电技术》 CSCD 2024年第1期170-179,共10页 Power Generation Technology
基金 上海市科委重点项目(20dz1206100) 上海市军民融合发展专项项目(2019-jmrh1-kj40)。
关键词 LCL型并网逆变器 状态重构 准谐振扩张状态观测器 有源阻尼 电流解耦控制 LCL-type grid-connected inverter state reconfiguration quasi resonant-extended state observer active damping current decoupling control
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