RESEARCHONSUPPRESSION STRATEGY OF LOW FREQUENCY SUBHARMONICS OF GRID-CONNECTED INVERTER BASED ON PIR

doi:10.19912/j.0254-0096.tynxb.2021-0690

Abstract

Abstract: In view of the high content of low-frequency subharmonics of grid-connected current caused by grid voltage distortion,A control strategy based on proportional integral-quasi-resonance（PIR） combined with current harmonic detection loop is proposed to suppress current harmonics. First, analyze the principle of the grid-connected inverter and establish a mathematical model of the current inner loop. Based on the principle of internal model, the full feedforward of the grid voltage is introduced to eliminate the influence of the grid voltage on the grid-side current. Secondly, analyze the principle of current harmonic detection and suppression. The current specific sub-harmonic detection loop is used to extract the harmonic components of the inverter side current, and the closed-loop control is used to suppress the current harmonics. The parameters of alignment the resonant controller are set by using Bode diagram. Finally, a Matlab/Simulink simulation model is established and a dSPACE-DS1104 semi-physical simulation platform is built. The simulation and experimental results test the effectiveness and feasibility of the proposed control strategy.

Key words: harmonic distortion, grid-connected inverter, harmonic suppression, PIR controller, coordinates transformation

摘要： 针对电网电压畸变造成并网电流低频次谐波含量较高的问题,提出一种基于比例积分-准谐振（PIR）与电流谐波检测环相结合和控制策略抑制电流谐波。首先分析并网逆变器原理,建立电流内环数学模型。基于内模原理,引入电网电压全前馈消除电网电压对网侧电流和影响,其次分析电流谐波检测与抑制原理,采用电流特定次谐波检测环对逆变器侧电流提取谐波分量,并采用闭环控制抑制电流谐波,利用伯德图对准谐振控制器参数进行设定。最后建立Matlab/Simulink仿真模型并搭建dSPACE-DS1104半实物仿真平台,分析仿真与实验结果来验证所提控制策略和有效性与可行性。

关键词: 谐波失真, 并网逆变器, 谐波抑制, PIR控制器, 坐标变换

CLC Number:

TM646

Li Yudong, Huang Xin, Xia Zihao, Li Peifeng. RESEARCHONSUPPRESSION STRATEGY OF LOW FREQUENCY SUBHARMONICS OF GRID-CONNECTED INVERTER BASED ON PIR[J]. Acta Energiae Solaris Sinica, 2022, 43(12): 32-40.

李玉东, 黄鑫, 夏梓豪, 李佩峰. 基于PIR的并网逆变器低频次谐波抑制策略研究[J]. 太阳能学报, 2022, 43(12): 32-40.

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