Increasing the Wind Power Utilization of Hybrid AC/DC Systems Based on Optimal Active Power Control of HVDC

With the rapid development of renewable energy and HVDC technology for long-distance and large-capacity transmission, the coupling between AC and DC systems, and between renewable energy and DC transmission have become stronger. Relying only on the control resources of the traditional power systems is not enough to solve the problems of increasing the wind power utilization and reducing the power generation cost. Therefore, a new active power control method for the HVDC tie-line power operation is proposed. The control strategy of HVDC tie-line power is modelled in terms of a series of equivalent units. Then a maximal wind power utilization model for hybrid AC/DC systems is established, which aims to reduce the system generation cost and enhance the renewable energy utilization, based on the active power control of the HVDC tie-line transmitted power. The corresponding optimization model can be easily solved by conventional mixed-integer quadratic programming solvers. The effectiveness and feasibility of the proposed model is then validated through case studies.