Stability Boundary Characterization and Power Quality Improvement for Distribution Networks

Min Zhang, Yi Long, Shuai Guo, Zou Xiao, Tianling Shi (), Xin Xiang and Rui Fan
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Min Zhang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Yi Long: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Shuai Guo: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Zou Xiao: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Tianling Shi: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Xin Xiang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Rui Fan: State Grid Shanxi Electric Power Research Institute, Taiyuan 030001, China

Energies, 2024, vol. 17, issue 24, 1-26

Abstract: With the increasing proportion of distributed generators (DGs), distribution networks usually include grid forming (GFM) and grid following (GFL) converters. However, the incompatibility of dynamic performance caused by different control methods of the GFM and GFL converters may bring instability problems and power quality risks to the distribution network. To solve this issue, the models of the GFM and GFL converters are established first to lay a good foundation for stability analysis and power quality improvement control. On this basis, an inner loop parameters design scheme is developed for GFM converters based on the D-Partition method, which facilitates the stability boundary characterization. Meanwhile, a current injection strategy is proposed to enhance the voltage support capacity of the GFL converter during grid faults. Moreover, for the distribution network with multi-converters, a compensation current control based on the analytic hierarchy process and coefficient of variation is proposed to ensure a balance between minimal capacity and optimal power quality. In this manner, DGs can be plug-and-play without considering stability and power quality issues. Finally, the effectiveness of the proposed strategy is validated with simulation results.

Keywords: grid forming converter; grid following converter; stability boundary; voltage support; power quality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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