Harmonic Compensation Control Method of Grid Simulator Based on Generalized Second-Order Differential

2023 IEEE International Conference on Power Science and Technology (ICPST) Pub Date : 2023-05-05 DOI:10.1109/ICPST56889.2023.10165210

Fang Liu, Yu Bian, Lei Tao, Wenqiang Wang, Zongzheng Cui, Haiyan Zou

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Abstract

The LC-type grid-connected inverter is susceptible to the effects of grid harmonics., and the grid simulator can be used to simulate the occurrence of the background harmonics of the grid to ensure that the harmonic components of the inverter when it is connected to the grid meet the corresponding requirements. Due to the complexity of the harmonic compensation control strategy of the grid simulator, the simulation accuracy for specific harmonics is not exact and the stability is poor. To solve this problem, a generalized second- order differentiator is constructed and used for harmonic compensation in the paper. The controller can realize the phase-frequency characteristics of lead compensation for a specific frequency range based on the differential action, and eliminate the inherent noise interference at high frequency for the differential. By connecting the harmonic compensation control loop based on the generalized second-order differentiator in parallel with the double closed-loop PI control, the amplitude-frequency characteristics of the compensator for a specific frequency range can be freely adjusted by optimizing the parameters of the generalized second-order differentiator, and the accurate simulation of fundamental waves as well as specific sub-harmonics can be realized. Finally, the effectiveness of the proposed strategy is verified by MATLAB/Simulink simulation.

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基于广义二阶微分的网格模拟器谐波补偿控制方法

lc型并网逆变器易受电网谐波的影响。，并网模拟器可以用来模拟电网背景谐波的发生情况，保证逆变器并网时的谐波分量符合相应要求。由于电网仿真器谐波补偿控制策略的复杂性，导致特定谐波的仿真精度不准确，稳定性差。为了解决这一问题，本文构造了一个广义二阶微分器，并将其用于谐波补偿。该控制器可以基于差动作用在特定频率范围内实现引线的相频特性补偿，并消除差动在高频处的固有噪声干扰。将基于广义二阶微分器的谐波补偿控制回路与双闭环PI控制并联，通过优化广义二阶微分器的参数，可以自由调节补偿器在特定频率范围内的幅频特性，实现对基波和特定次谐波的精确模拟。最后，通过MATLAB/Simulink仿真验证了所提策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2023 IEEE International Conference on Power Science and Technology (ICPST)

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