Model Analysis and Decouple Control Strategy of Three-Phase Grid-Connected Inverter with an LCL Filter

doi:10.7652/xjtuxb201402008

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Model Analysis and Decouple Control Strategy of Three-Phase Grid-Connected Inverter with an LCL Filter

更新时间：2025-07-09

- Model Analysis and Decouple Control Strategy of Three-Phase Grid-Connected Inverter with an LCL Filter
- Vol. 48, Issue 2, Pages: 44-49+110(2014)
- 作者机构：
  
  西安交通大学电气工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201402008
  CLC： TM464
- Online First：10 February 2014，
  
  Published：2014
- 稿件说明：
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Model Analysis and Decouple Control Strategy of Three-Phase Grid-Connected Inverter with an LCL Filter[J]. 2014, 48(2): 44-49+110.
DOI：

Model Analysis and Decouple Control Strategy of Three-Phase Grid-Connected Inverter with an LCL Filter[J]. 2014, 48(2): 44-49+110. DOI： 10.7652/xjtuxb201402008.

摘要

建立了同步旋转坐标下三相LCL型并网逆变器的平均模型

提出该模型存在的谐振峰问题

并分析了阻尼电阻对系统谐振峰的影响

揭示了该模型的新特性。在同步旋转坐标系下

传统的单闭环控制方案无法实现D轴与Q轴的解耦

针对此问题提出了一种三相LCL型并网逆变器的解耦控制方案。该方案的基本思想是:应用框图等效变换原理

逐步消除每个滤波器元件D轴与Q轴之间的耦合项

并将所有解耦项移至控制器之后

得到系统总的解耦表达式

实现D轴与Q轴的完全解耦。仿真和实验结果表明:与传统的单闭环控制方案相比

提出的控制方法能有效解决D轴与Q轴的耦合问题

实现有功功率与无功功率的独立控制

且系统具有良好的动态响应特性

可为新能源并网逆变器的精准功率控制提供技术保障。

Abstract

The average model of three-phase LCL-type grid-connected inverter in synchronous reference frame is deduced and the existing resonant peaks are emphasized. The influence of damping resistances on resonance peaks is analyzed to reveal some new characteristics of the average model. The conventional single closed-loop control method cannot completely eliminate the coupling terms between D-axis and Q-axis in synchronous reference frame. To break down this limitation

a decouple control strategy is proposed for the three-phase grid-connected inverter with an LCL filter. The essence of the proposed decouple control strategy is to eliminate each coupling term of the LCL filter between D-axis and Q-axis gradually by equivalent transformation of block diagram

then to realize the decoupling process by moving all the decoupling items together to the controller. Simulation and experiments indicate that the proposed control strategy solves coupling problems more effectively compared with the conventional single closed-loop control

and realizes the active and reactive power control independently with satisfactory dynamic performance to technically support the exact power control in renewable energy generation.

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references

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