弱电网下基于多目标约束的并网逆变器电网电压前馈策略

汪海宁; 王旭之; 谢缔; 汪亮亮; 姚继刚; 刘静

doi:10.19912/j.0254-0096.tynxb.2024-0988

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (10) : 444-454. DOI: 10.19912/j.0254-0096.tynxb.2024-0988

弱电网下基于多目标约束的并网逆变器电网电压前馈策略

汪海宁¹, 王旭之¹, 谢缔², 汪亮亮², 姚继刚², 刘静¹

作者信息 +

VOLTAGE FEEDFORWARD STRATEGY OF GRID-CONNECTED INVERTER BASED ON MULTI-OBJECTIVE CONSTRAINTS IN WEAK GRID

Wang Haining¹, Wang Xuzhi¹, Xie Di², Wang Liangliang², Yao Jigang², Liu Jing¹

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文章历史 +

摘要

建立LCL单相跟网型并网逆变器阻抗模型,分析锁相环引起逆变器输出阻抗相位降低机理;提出弱电网下多目标约束的电网电压前馈控制策略以改善锁相环对系统稳定性的影响,首先通过设计公共耦合点电压前馈通道的传递函数得出一个正阻抗,以抵消因锁相环引入的负阻抗;其次为降低前馈控制策略的工程实现难度,从基频段、中频段的幅频偏差及相频偏差等方面建立多目标约束对原有的前馈传递函数进行简化,设计出近似等效前馈传递函数,并进行稳定性分析。仿真与实验验证所提方法有效增强了并网逆变器在弱电网下的适应能力。

Abstract

The impedance model of LCL single-phase grid-connected inverter is established, and the mechanism of phase reduction of inverter output impedance caused by PLL is analyzed. In order to improve the influence of phase-locked loop on system stability, a multi-objective constrained power grid voltage feedforward control strategy is proposed. Firstly, a positive impedance is obtained by designing the transfer function of the voltage feedforward channel at the common coupling point to offset the negative impedance introduced by the phase-locked loop. Secondly, in order to reduce the difficulty of engineering implementation of feedforward control strategy, the original feedforward transfer function is simplified by establishing multi-objective constraints from the aspects of amplitude-frequency deviation and phase-frequency deviation in basic frequency band and middle frequency band, and an approximate equivalent feedforward transfer function is designed. And the stability analysis is presented. Simulation and experiment verify that the proposed method effectively enhances the adaptability of grid-connected inverter in weak grid.

导出引用

汪海宁, 王旭之, 谢缔, 汪亮亮, 姚继刚, 刘静. 弱电网下基于多目标约束的并网逆变器电网电压前馈策略[J]. 太阳能学报. 2025, 46(10): 444-454 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0988

Wang Haining, Wang Xuzhi, Xie Di, Wang Liangliang, Yao Jigang, Liu Jing. VOLTAGE FEEDFORWARD STRATEGY OF GRID-CONNECTED INVERTER BASED ON MULTI-OBJECTIVE CONSTRAINTS IN WEAK GRID[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 444-454 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0988

中图分类号： TM464

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