Terminal Voltage Overlimit Mitigation for Low-voltage Distribution Network Based on Coordinated Active and Reactive Power Control of Soft Open Point

The power of distributed generator fluctuates and the distribution in tegration location is uneven. Its high proportion and large-scale integration to the low-voltage distribution network will lead to the problem of voltage overlimit at the end of the feeder, so how to make full use of the regulation capability of the distribution primary equipment to achieve rapid and flexible voltage regulation is the key to improve the accommodation ability of the distribution network to the distributed generators. This paper builds a flexible interconnected distribution network based on soft open point (SOP) and proposes a voltage regulation scheme based on coordinated active and reactive control of SOP, which has the best voltage regulation performance compared to existing reactive-power-based voltage regulation scheme of the energy storage system and active-power-based voltage regulation scheme of equipment, and can significantly increase the capacity of the distribution network to accommodate distributed generators. Since the active power transmission of SOP will affect the voltage of the interconnection line at the same time, the distribution network operation modes are divided according to the inherent voltage level at the end of each feeder, and the internal energy storage device of SOP is organically combined to propose a voltage regulation control strategy based on multi-modal coordination of SOP, which can simultaneously achieve the voltage overlimit mitigation at the end of interconnected distribution lines. This scheme can be flexibly extended to the multi-terminal flexible interconnection scenario. The feasibility and effectiveness of the proposed control strategy are verified by the built simulation model of the flexible interconnected distribution network. © 2023 Automation of Electric Power Systems Press. All rights reserved.