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Synchronization stability of power-grid-tied converters
Rui Ma1, Yayao Zhang1, Ziqian Yang2
1State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Chaos (Woodbury, N.Y.)
|April 1, 2023
Summary
Synchronization stability in power systems is complex due to renewables. This review clarifies the role of phase-locked loops (PLLs) in grid-tied converters using nonlinear models, highlighting their link to nonlinear science concepts.
Area of Science:
- Electrical Power Engineering
- Nonlinear Dynamics
- Renewable Energy Systems
Background:
- Synchronization stability is critical in power systems, especially with high renewable energy penetration.
- Power electronics devices and grid-tied converters introduce new complexities to synchronization.
- Existing studies on synchronization stability in renewable-dominated systems lack systematic analysis.
Purpose of the Study:
- To review and clarify the concept of synchronization stability in renewable-dominated power systems.
- To analyze synchronization stability using various nonlinear models of grid-tied converters.
- To establish the fundamental link between converter synchronization stability and phase synchronization in nonlinear science.
Main Methods:
- Review of recent nonlinear models for renewable-dominated power systems.
- Analysis of second-order (generalized swing equation) and higher-order (fourth- and fifth-order) models for grid-tied converters.
- Investigation of the role of the phase-locked loop (PLL) in synchronization.
Main Results:
- The generalized swing equation, considering only the PLL, is a second-order model similar to traditional synchronous generator swing equations.
- Fourth-order and fifth-order models, including outer controllers, exhibit combined grid synchronization and DC capacitor active power balance.
- The phase-locked loop (PLL) is identified as a crucial element for synchronization stability.
Conclusions:
- Synchronization stability in renewable-dominated power systems is clarified through the lens of nonlinear models.
- Converter synchronization stability is fundamentally rooted in the phase synchronization concept from nonlinear science.
- This work provides a systematic study on a controversial and crucial topic in electrical power engineering.
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