Improved LADRC constant voltage control strategy for photovoltaic integration into MVDC distribution networks
DOI:10.19783/j.cnki.pspc.240461
Key Words:photovoltaic power generation system  MVDC system  linear active disturbance rejection control  anti-interference capability
Author NameAffiliation
LI Chenjia1 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
LI Yan1 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
FAN Yiwen1 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
LIU Chao1 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
WANG Cong2 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
HE Yang1 1. China Electric Power Research Institute, Beijing 100192, China
2. State Grid Beijing Electric Power Company, Beijing 100031, China 
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Abstract:When external disturbances occur, the bus voltage of a MVDC distribution system with PV integration will fluctuate, posing challenges to the stable operation of the power system. In this paper, a PV constant voltage control strategy based on improved linear active disturbance rejection control (LADRC) is proposed to address the insufficient disturbance rejection of traditional PV constant voltage control strategies. For the two-stage integrated DC/DC converter, a linear extended state observer (LESO) based on differential feedback is used to design the improved LADRC structure, and the parameter tuning, disturbance rejection, and stability of the controller are analyzed in detail. The effects of PV constant voltage control using PI control, traditional LADRC, and improved LADRC are compared on a simulation platform. The results show that the PV constant voltage control strategy based on the improved LADRC has excellent anti-interference capability and can restore the DC bus voltage to stability with smaller overshoot and faster response speed.
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