风火联合调度的风电场一次调频控制策略研究

Wind Farm Primary Frequency Control Strategy Based on Wind & Thermal Power Joint Control

随着风电在电力系统中渗透率的提高,电力系统单独依靠传统电源进行调频的能力被不断削弱,这就要求风电应具备配合传统电源参与系统频率调节的能力。首先,该文充分考虑风电调频响应速度快、火电调频持续时间久的特性,提出一种以火电机组调频为主、风电机组调频为辅的一次调频联合控制策略;其次,根据不同运行工况,提出改进的风机分组优化和功率分配策略,实现了风机有序参与/退出调频,有效规避了系统频率二次跌落问题;最后,改进风机转速恢复和转速保护模块,提高风电机组参与一次调频的安全性。仿真结果表明,所提策略能够有效实现风火联合参与一次调频,在保证经济性和可靠性的前提下,充分利用风电调频容量,有效改善系统频率特性。

With the increase of wind power penetration in power system, the frequency control ability of power system completely depending on traditional power supply becomes weakened. This actuality requires wind power should take part in the frequency regulation process combined with the traditional power. Firstly, considering wind power’s fast response ability and thermal power’s long-term continuity characteristic during primary frequency control, a joint primary frequency control strategy was proposed in the paper. Secondly, according to the different operating conditions, an improved packet optimization and power allocation strategy for wind turbines was presented to make the wind turbines participate and exit frequency control in an orderly manner, which effectively avoid the secondary drops of system frequency. Finally, the speed recovery and protection module were both ameliorated to raise the security of wind turbine during primary frequency control. The simulation results showed that the proposed approaches can effectively implement a joint primary frequency control of wind power and thermal power. Under the premise of ensuring safety and economy, these approaches fully used the frequency control capacity of wind power and effectively improved the frequency characteristics of the power system.