含飞轮储能单元的永磁直驱风电机组频率调节研究

Research on Frequency Regulation of Permanent Magnet Direct-driven Wind Turbine with Flywheel Energy Storage Unit

在分析风力发电接入对电力系统频率特性影响的基础上,提出利用飞轮储能单元进行辅助频率调节的控制策略。该控制策略通过对飞轮储能单元输出功率的灵活控制增大系统等效惯量和阻尼,进而改善风电接入电力系统的频率特性。通过对含飞轮储能单元的永磁直驱风电系统在全工况下的仿真对比研究表明,在实现最大风能跟踪控制的前提下,所提控制策略下的系统频率特性可得到有效改善,有助于提高风电接入电网的频率稳定性。

The impact of the integration of wind power on the power system frequency characteristics was analyzed. The control strategy using flywheel energy storage unit （FESU） to realize the auxiliary regulation of system frequency was proposed. The equivalent inertia and damping of the power system can be increased by flexibly controlling the output power of the FESU with the proposed control strategy. The simulation results of a direct-driven permanent magnet wind power generation system with FESU under various operation conditions show that the system frequency characteristics can be effectively improved, in the meanwhile, the maximum power point tracking control can also be achieved. As a consequence, the proposed control strategy can improve the frequency stability of power system when integrating the wind power generation.