Study on feedforward control strategy of grid-connected inverter based on virtual resistance

HUANG Yuhe; ZHENG Shousen; HE Laipei

doi:10.13471/j.cnki.acta.snus.2020B148

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Study on feedforward control strategy of grid-connected inverter based on virtual resistance

Research articles | 更新时间：2023-11-01

- Study on feedforward control strategy of grid-connected inverter based on virtual resistance
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 61, Issue 2, Pages: 90-99(2022)
- 作者机构：
  
  中山大学物理学院，广东广州 510275
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2020B148
  CLC： TM761
- Published：25 March 2022，
  
  Published Online：28 May 2021，
  
  Received：02 December 2020，
  
  Accepted：20 December 2020
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黄玉和,郑寿森,何来沛.基于虚拟阻抗的并网逆变器前馈控制策略研究[J].中山大学学报(自然科学版),2022,61(02):90-99.

HUANG Yuhe,ZHENG Shousen,HE Laipei.Study on feedforward control strategy of grid-connected inverter based on virtual resistance[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(02):90-99.
黄玉和,郑寿森,何来沛.基于虚拟阻抗的并网逆变器前馈控制策略研究[J].中山大学学报(自然科学版),2022,61(02):90-99. DOI： 10.13471/j.cnki.acta.snus.2020B148.

HUANG Yuhe,ZHENG Shousen,HE Laipei.Study on feedforward control strategy of grid-connected inverter based on virtual resistance[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(02):90-99. DOI： 10.13471/j.cnki.acta.snus.2020B148.

摘要

LCL滤波器因其对功率器件高频开关噪声的良好抑制作用被广泛应用在并网逆变器之中，但该滤波器的应用又受限于其LCL结构所导致的系统谐振。基于虚拟阻抗的逆变器系统内环采用并网电流的二次微分项对LCL滤波器的固有谐振频率进行抑制，外环将并网电流作为被控对象进行直接控制，从而形成双闭环控制系统。该方法在传统的有源阻尼方案上做了改进，减少了系统所需的传感器的数量，但因反馈状态量的减少，电网电压中含有谐波分量时，系统容易发生震荡，降低了逆变器系统的抗干扰能力。针对这一问题，文章采用完全电压前馈的控制策略对以虚拟阻抗作为有源阻尼的并网逆变器系统做出了改进。该策略能在电网电压畸变的情况下降低入网电流的总谐波失真（THD），提升并网功率因数。仿真结果证明了该前馈控制策略的有效性。

Abstract

The LCL filter is widely used in grid-connected inverters because of its superior suppression effect on high frequency switching noise of power devices， but the application of this filter is limited by the system resonance caused by its LCL structure. The second differential term of the grid-connected current is introduced to suppress the natural resonance frequency of the LCL filter in the inner loop of the inverter system based on virtual impedance， and the outer loop directly controls the grid-connected current， thus forming a double closed-loop control system. This method has made improvements on the basis of traditional active damping schemes， which reduces the number of sensors and thus reduces the cost of the inverter. Due to the reduction of the feedback state quantity， the system is prone to oscillating when the grid voltage contains harmonic components， which weaken the anti-interference ability of the inverter system. To solve this problem， this paper improves the virtual impedance-based grid-connected inverters with a full feedforward function of grid voltage. This strategy can reduce the total harmonic distortion （THD） of the grid current and improve the grid-connected power factor in the case of grid voltage distortion. The simulation results prove the effectiveness of the proposed control strategy.

关键词

LCL滤波器虚拟阻抗有源阻尼电压前馈

Keywords

LCL filtervirtual resistanceactive dampingvoltage feedforward

references

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Yuhe HUANG

Shousen ZHENG

Laipei HE

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