Stability analysis and stabilization control of a grid-forming VSC-HVDC system

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-08-07 DOI:10.3389/fenrg.2024.1437287
Yi Lu, Gang Shi, Qian Chen, Peng Qiu, Jianqiao Zhou, Renxin Yang, Jianwen Zhang
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Abstract

As the penetration of the integrated intermittent and fluctuating new energy (e.g., wind and photovoltaic power) increases, the conventional grid-following voltage source converter (VSC)-based high voltage direct current (HVDC) transmission system faces the problem of interactive instability with the grid. A novel grid-forming control strategy is proposed to overcome these issues, which adopts the dynamics of a DC capacitor to realize the function of self-synchronization with the grid. Moreover, the per-unit DC voltage can automatically track the grid frequency, acting as a phase-locked loop. Next, the small-signal model of the grid-forming VSC-HVDC system is established, and the stability of the system is analyzed using the eigenvalue analysis method and the complex power coefficient method. In addition, the stabilization controller is proposed for the grid-forming (GFM) control structure, which further enhances the grid-forming VSC-HVDC system’s stability and helps it operate stably under both stiff and weak grid conditions. Research results show that the VSC-HVDC system under the proposed grid-forming control can work stably in both stiff and weak grids. The grid-forming VSC-HVDC system is robust and can maintain stable operations with a large range variation of the parameters in the current and voltage control loop. Simulations are carried out on the PSCAD/EMTDC platform to verify the proposed grid-forming control strategy.
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形成电网的 VSC-HVDC 系统的稳定性分析和稳定控制
随着间歇性和波动性综合新能源(如风能和光伏发电)渗透率的增加,传统的基于电压源变换器(VSC)的高压直流(HVDC)输电系统面临着与电网交互不稳定的问题。为克服这些问题,我们提出了一种新颖的成网控制策略,它采用直流电容器的动态特性来实现与电网自同步的功能。此外,单位直流电压可自动跟踪电网频率,起到锁相环的作用。接下来,建立了成网 VSC-HVDC 系统的小信号模型,并使用特征值分析法和复功率系数法分析了系统的稳定性。此外,还提出了成网(GFM)控制结构的稳定控制器,进一步增强了成网 VSC-HVDC 系统的稳定性,有助于其在硬电网和弱电网条件下稳定运行。研究结果表明,在拟议的成网控制下,VSC-HVDC 系统可以在僵电网和弱电网中稳定运行。成网 VSC-HVDC 系统具有很强的鲁棒性,在电流和电压控制环中的参数变化范围较大时也能保持稳定运行。在 PSCAD/EMTDC 平台上进行了仿真,以验证所提出的电网形成控制策略。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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