高渗透率条件下考虑功率协调性的可再生能源调频方式

随着可再生能源发电的占比不断提高,现代电力系统存在转动惯量不断降低,频率特性以及功率传输不稳定的现象。文章分析了可再生能源接入对传统电网频率、功率的动稳态特性影响,明确了可再生能源需要参与系统调频。同时考虑到传统机组与可再生能源出力的协调性,以及系统频率特性的性能,分析了3种可再生能源参与系统调频的方式,对比了在负荷阶跃下对频率以及功率特性的影响,提出了传统机组与可再生能源出力协调性调频方案。基于RTDS的硬件仿真实验表明,所提调频方案保证了系统频率响应的动稳态特性,并且解决了同步发电机与可再生能源功率相互协调的问题。

Frequency Regulation Mode of Renewable Energy Considering Power Coordination under the Condition of High Penetration

As the proportion of renewable energy power generation continues to increase, the inertia of modern power system continues to decrease, and the frequency characteristics and power transmission appear unstable. This paper analyzes the influence of renewable energy access on the dynamic and steady-state characteristics of traditional power grid frequency and power, and clarifies that renewable energy needs to participate in system frequency regulation. Considering the coordination of the output of traditional synchronous generators and renewable energy, and the performance of the system frequency characteristics, three ways of renewable energy participating in the system frequency regulation are analyzed, and the influences on the frequency and power characteristics under load step are compared. A coordinated frequency regulation scheme for the output of traditional units and renewable energy is proposed. The hardware simulation experiment based on RTDS shows that the frequency regulation scheme proposed in this paper ensures the dynamic and steady-state characteristics of the frequency response of the system, and solves the problem of coordination between the synchronous generator and the renewable energy power.