Abstract
A distributed optimal voltage control (DOVC) strategy based on the alternating direction method of multipliers (ADMM) is proposed for the AC grid with voltage source converter (VSC) DC connection and offshore wind farms (OWFs). The proposed DOVC strategy achieves global optimal power distribution inside the AC grid with DC connection to minimize the power losses while minimizing the bus voltage deviation from the rated value as well as power losses inside several OWFs. The optimal power flow (OPF) of the AC grid with VSC DC connection combined with model predictive control (MPC) is relaxed by using the semidefinite programming (SDP) relaxation technique. The MPC-based voltage optimization problem for the OWF is formulated by considering the dynamics of WTs. The ADMM is used to decompose the large-scale strongly coupled optimization problem, which is calculated in AC-DC grid and OWF controllers in parallel while guaranteeing global optimality. Compared to conventional control methods, the control performance of the system is enhanced. A modified IEEE-30 bus system with DC connection incorporating three OWFs consisting of 288 wind turbines (WTs) is used to evaluate the proposed DOVC strategy.
Highlights
Wind energy is rapidly growing due to the pressure of global carbon emission and fossil fuel free policy [1,2]
A distributed optimal voltage control (DOVC) strategy based on the alternating direction method of multipliers (ADMM) is proposed for the AC grid with voltage source converter (VSC) DC connection and offshore wind farms (OWFs)
The optimal power flow (OPF) of the AC grid with VSC DC connection combined with model predictive control (MPC) is relaxed by using the semidefinite programming (SDP) relax ation technique
Summary
Wind energy is rapidly growing due to the pressure of global carbon emission and fossil fuel free policy [1,2]. In [18], the ADMMbased voltage control methods were proposed to regulate terminal bus voltage and achieve economic operation by coordinating WT reactive power outputs inside OWFs. In [19], an ADMM-based hierarchical in ertial control strategy was proposed to improve system frequency response by coordinating WT active power outputs. The distributed control has not been studied for the coordinated optimal control for the AC grid with DC connection incorporating OWFs as well as considering voltage regulation inside OWF collection systems. 2. The SDP relaxation is adopted for OPF in AC grid with DC connection while an MPC-based voltage control model inside OWF is formulated to obtain a global optimal solution, which handle the inherent nonconvexities of the original problem.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Electrical Power & Energy Systems
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
