Research on the Weak-Bus Voltage Support Effect of Energy Storage Type Intelligent Soft Open Point

Tao Yan, Teng Li () and Zerong Liang
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Tao Yan: National Key Laboratory of Renewable Energy Grid Connection, China Electric Power Research Institute Co., Ltd., Beijing 100192, China
Teng Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Zerong Liang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2024, vol. 17, issue 23, 1-13

Abstract: With the integration of a high proportion of distributed generators (DGs), the imbalance between source and load power intensifies, causing the distribution grid to become ‘weak’ during certain periods, which can easily lead to voltage over-limit for the distribution grid. Due to the coupling of active and reactive power in weak power grids for voltage regulation, the effectiveness of single reactive voltage regulation for voltage over-limit is not satisfactory. This paper uses an Energy Storage type Intelligent Soft Open Point (E-SOP) with grid-forming controlled energy storage to simultaneously adjust the active and reactive power between different grid clusters to suppress voltage over-limit for a weak grid. Firstly, based on the system architecture and bus load characteristics, the distribution grid is divided into clusters, and the cluster Thevenin equivalent model is established. Then, different voltage support schemes are compared and analyzed through the cluster active power-voltage (P-V) curve. Through simulation verification of the IEEE 33-bus system containing DGs, it is concluded that the scheme of installing E-SOP in the distribution grid containing DGs enhances the active power transmission capability of the grid and provides better voltage support compared to traditional reactive power compensation and system capacity expansion schemes.

Keywords: voltage over-limit; energy storage intelligent soft switch; cluster division; grid-forming control; voltage support (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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