Control of bi-directional DC-DC converter using batteries for wind power generation

The wind turbines and storage batteries are considered one of the main components of distribution systems. The paper describes in details the design and control of one of the bi-directional DC-DC converter topologies. It is bi-directional Dual Active Bridge. A control strategy, using PI controllers, for the storage batteries is developed based on constant wind turbine speed. With normal wind power generation, the batteries are set in a charging mode. When wind power generation fluctuates due to large wind speed variation, the developed control strategy allows batteries to mitigate these power fluctuations and avoids severe voltage transients on congested power systems. An actual wind speed data are used to simulate the impact of wind penetration during a 24-hour period. The simulations are carried out for wind without and with power fluctuation.