李群,唐伟佳,汪成根,张森
LI Qun,TANG Weijia,WANG Chenggen,ZHANG Sen

• 1:国网江苏省电力有限公司电力科学研究院

摘要(Abstract)：

构网-跟网多机混联系统兼具构网电压源和跟网电流源的技术优势，然而弱电网下跟网变流器暂态期间易发生PLL（锁相环）引起的暂态电压失稳问题。对此，提出一种弱电网下计及暂态电压稳定约束的构网-跟网变流器最优配比策略。首先，介绍了跟网和构网变流器的控制系统架构和暂态电压特性；接着，分析了PLL在弱电网下暂态失稳的本质；然后，将构网变流器作为新能源场站内部电压源并进一步得出新能源系统内构网变流器的最优配比策略。所提策略保证了跟网变流器暂态工况下的PLL稳定性，结合暂态初期的构网电压支撑和暂态稳定期的跟网电压支撑两方面优势，实现了新能源场站对暂态电压主动、快速且有效的支撑。最后，通过构网-跟网变流器多机混联系统仿真，验证了所提策略的有效性和实用性。
The hybrid grid-forming(GFM) and grid-following(GFL) converter integration systems combine the technical advantages of GFM voltage sources and GFL current sources. However, in weak power grids, the transient period of the GFL inverter is prone to transient voltage instability caused by the phase-locked loop(PLL). To address this, the paper proposes an optimal allocation strategy for GFM and GFL inverters, taking into account transient voltage stability constraints in weak grids. First, the control system architecture and transient voltage characteristics of both GFM and GFL inverters are introduced. Next, the essence of transient instability of the PLL in weak grids is analyzed. Third, it is suggested utilizing GFM inverters as internal voltage sources for new energy stations and derive an optimal allocation strategy for GFM inverters within the new energy system. This strategy ensures PLL stability for GFL inverters under transient conditions, leveraging the advantages of GFM voltage support in the initial transient phase and GFL voltage support during the transient stability. This enables new energy stations to provide active, rapid, and effective support for transient voltage stability. Finally, the effectiveness and practicality of the proposed strategy is validated through simulations of the hybrid GFM and GFL converter integration systems.

关键词(KeyWords)： 构网;跟网;弱电网;最优配比;暂态电压
GFM;GFL;weak power grid;optimal allocation;transient voltage

Abstract:

Keywords:

基金项目(Foundation): 国网江苏省电力有限公司科技项目（J2023034）

作者(Author): 李群,唐伟佳,汪成根,张森
LI Qun,TANG Weijia,WANG Chenggen,ZHANG Sen

DOI: 10.19585/j.zjdl.202501008

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