Emergency Active Power Control Considering Power Reserve for Direct Driven Wind Power System Under Overspeed Power Shedding Operation

In order to meet the requirements of high reliability and stable operation of wind farms in the future, the wind turbines (WTs) not only need to be able to achieve a sudden power drop but also have the ability to increase emergency active power in emergency power control (EPC). Generally, WTs operate at the maximum power point to gain the optimal benefit. However, at this time, the generator unit lacks the ability to further increase the active power. Therefore, the energy storage system is usually equipped traditionally. Moreover, with the establishment of the wind farm panoramic monitoring system (PMS), a rapid control network has been built to meet the EPC response requirements to satisfy the fine level control for each generator unit. In this paper, the overspeed power shedding operation mode is adopted for the direct-drive wind power system (DDWPS) to reserve the active power. After the wind farm receives the emergency active power increase command, the method is realized by controlling the machine-side converter to reduce the rotor speed to release the kinetic energy. Based on Matlab/Simulink, a rated 1.5MW DDWG system simulation model is established to compare the response time and duration time under different emergency active power increases, which provides a theoretical basis for the future EPC multi-objective optimization of wind farms.