基于惯性/下垂控制的变速型风电机组频率协调控制方法

在高渗透风电接入的孤立电力系统中,由于传统调频资源不足,风电大规模波动可能导致系统频率波动,限制新风电的进一步接入。因此,提出一种基于惯性控制和下垂控制的变速型风电机组频率协调控制方法。首先对双馈异步发电机(Doubly Fed Induction Generator,DFIG)、永磁同步发电机(Permanent Magnet Synchronous Generator,PMSG)和有源失速异步发电机(Active-Stall Induction Generator,ASIG)三种类型变速风力发电机组(Variable Speed Wind Turbines, VSWTs)的频率控制特性进行分析。在此基础上,提出基于惯量控制和下垂控制的变速型风机频率协调控制策略,并分析在不同扰动条件下,不同惯性参数与下垂参数对孤立电力系统频率的影响,据此选择合适的控制参数。最后,在随机风速扰动和大扰动条件下对风电机组的稳态与暂态响应进行仿真,验证了所提频率抑制方法的有效性。结果表明,所提方法能显著提高孤立电力系统频率稳定水平。

Frequency coordination control of a variable speed wind turbine based on inertia/droop control

Large scale fluctuation of wind energy power may lead to system frequency fluctuation because of the shortage of traditional frequency modulation resources in an isolated power system with high permeability access. This limits the further access to new wind energy power. Hence, this paper presents a frequency coordination control method of a variable speed wind turbine based on inertial and droop control. First, the frequency control characteristics of three types of Variable Speed Wind Turbines (VSWTs) are analyzed, including those of a Doubly Fed Induction Generator (DFIG), a Permanent Magnet Synchronous Generator (PMSG) and an Active Stall Induction Generator (ASIG). From this, a frequency coordination control strategy of a variable speed wind turbine based on inertial and droop control is proposed, and the influence of different inertia and droop parameters on the frequency of isolated power system under different disturbance conditions is analyzed. From this, the appropriate control parameters can be selected. Finally, the steady-state and transient responses of wind turbines are simulated under the condition of random wind speed disturbance and large disturbance, and the effectiveness of the proposed frequency suppression method is verified. The results show that the proposed method can significantly improve the frequency stability of an isolated power system. This work is supported by the National Natural Science Foundation of China (No. 61963020) and the Science and Technology Project of Yunnan Power Grid Company: Yunnan Power Grid Stability Control Technology Research and Closed Loop Simulation Platform with Multiple DC and High Proportion of New Energy (No. KJDK2018210).