基于直流链路分数阶虚拟同步的构网型变流器控制策略

杨兴武; 马朝旭; 王雅妮; 刘春; 宋晋峰; 陈国栋

doi:10.19912/j.0254-0096.tynxb.2024-1426

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (12) : 426-436. DOI: 10.19912/j.0254-0096.tynxb.2024-1426

基于直流链路分数阶虚拟同步的构网型变流器控制策略

杨兴武¹, 马朝旭¹, 王雅妮¹, 刘春¹, 宋晋峰², 陈国栋²

作者信息 +

GRID-FORMING CONVERTERS CONTROL STRATEGY BASED ON FRACTIONAL-ORDER VIRTUAL SYNCHRONIZATION OF DC-LINKS

Yang Xingwu¹, Ma Zhaoxu¹, Wang Ya’ni¹, Liu Chun¹, Song Jinfeng², Chen Guodong²

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文章历史 +

摘要

为解决阻尼效应增加导致惯性效应退化的问题,该文结合直流电容电压自同步控制和分数阶控制理论,提出一种基于直流链路分数阶虚拟同步（DCFOVSC）的构网型变流器控制策略。利用直流链路电容的动态特性实现自同步,引入分数阶控制拓展控制自由度,优化系统动态特性,为系统提供足量惯性和阻尼支撑。建立DCFOVSC控制策略的小信号模型,利用频域分析讨论DCFOVSC的动态性能及影响因素,证明其能够在弱电网中稳定运行,具有良好的鲁棒性。在Matlab/Simulink中搭建基于所提控制策略的并网变流器,在有功功率变化、电网频率变化、不同电网强度、电网电压幅值变化4种工况下验证该控制策略的有效性。最后,进行实验验证。

Abstract

To address the issue of the decline in the inertia effect due to the rise in the damping effect, this paper integrates the DC capacitor voltage self-synchronization control and fractional order control theory, proposing a novel grid-forming converters based on DCFOVSC （DC link fractional order virtual synchronization control） control strategy. The dynamic characteristics of the DC link capacitance are employed to achieve self-synchronization, and fractional-order control is incorporated to augment the control degrees of freedom, optimize the dynamic characteristics of the system, and furnish sufficient inertia and damping support for the system. In this paper, a small-signal model of the DCFOVSC control strategy is established, and the dynamic performance and influencing factors of the DCFOVSC are discussed using frequency domain analysis. The analysis results demonstrate that the DCFOVSC is capable of stable operation in a weak grid with good robustness. A grid-connected converter based on the proposed control strategy is constructed in Matlab/Simulink, and the effectiveness of the control strategy is verified under four working conditions： active power variation, grid frequency variation, different grid strengths, and grid voltage amplitude variation. Finally, experimental validation is carried out.

导出引用

杨兴武, 马朝旭, 王雅妮, 刘春, 宋晋峰, 陈国栋. 基于直流链路分数阶虚拟同步的构网型变流器控制策略[J]. 太阳能学报. 2025, 46(12): 426-436 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1426

Yang Xingwu, Ma Zhaoxu, Wang Ya’ni, Liu Chun, Song Jinfeng, Chen Guodong. GRID-FORMING CONVERTERS CONTROL STRATEGY BASED ON FRACTIONAL-ORDER VIRTUAL SYNCHRONIZATION OF DC-LINKS[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 426-436 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1426

中图分类号： TM46

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