Direct Power Control with ramping rate criterion of complex power in grid adaptive 5MW PMSG MV Wind Turbines

摘要

This paper proposes a Direct Power Control (DPC) with ramping rate criterion of complex power in grid adaptive 5MW Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) Wind Turbines (WT). Benchmarking against the conventional control method is performed based on a neutral point clamped three-level back-to-back type voltage source converter. The ramping rate criterion of complex power is proposed to select the proper switching vector in DPC for a three-level NPC converter. This criterion is to maximize the ramping rate of complex power under the limitation of available switching vectors in a corresponding sector. Using a grid command and MPPT mode, the proposed control scheme automatically controls the generated output power to satisfy a grid requirement from the hierarchical wind farm controller. DPC with ramping rate criterion of complex power method is confirmed through PLECS simulations based on Matlab. Simulation result shows that proposed control method achieves a much shorter transient time than the conventional control method under a step response condition. The proposed control method makes it possible to provide a good dynamic performance for 5MW PMSG MV WTs in order to generate a high quality output power.