基于实时数字仿真的新能源场站并网调频技术研究

Research on grid-connected FM system of new energy field stations based on RTDS

中文关键词: 新能源场站  三阶锁相环  一次调频  惯量调频  实时数字仿真系统

英文关键词: new energy field  type-3 PLL  inertia modulation  primary frequency modulation  RTDS

中文摘要:

      新能源场站由于其不具备传统旋转发电机的机械惯量,对系统频率变化很难起到支撑作用。随着新能源发电比例不断提高,若新能源场站不参与系统频率调节,则当系统发生频率波动时,频率会发生快速变化,进一步恶化系统频率稳定性,因此研究新能源场站的调频技术特性具有重要意义。从提升场站频率响应和调整的速度出发,针对常用的二阶锁相环在频率斜升变化时不具备零稳态误差的问题,设计了一种频率响应速度更快,稳态性能和动态性能都较为优越的三阶锁相环,并且应用于新能源场站的半实物仿真平台中,进而在半实物仿真平台上以云南某新能源场站为样本,搭建了相应的半实物仿真模型,通过模拟不同频率阶跃变化和不同频率斜升变化,验证新能源场站的并网调频技术。

英文摘要:

      New energy field station does not have the mechanical inertia of the traditional rotary generator, so it is difficult to support the system frequency change. With the continuous improvement of the proportion of new energy power generation, if the new energy field station does not participate in the system frequency adjustment, the frequency will change rapidly when the system fluctuates, which will further deteriorate the system frequency stability, so it is of great significance to study the frequency regulation technology characteristics of the new energy field station. At the same time, as a key link in the new energy grid-connected control system, the phase-locked loop has the function of tracking the frequency signal of the grid connection point, and can help analyze the characteristics of voltage and current. In order to accelerate the speed of the frequency response and adjustment of the new energy station, a third- order phase-locked loop with faster frequency response is designed in this article, which also shares better steadystate performance and dynamic performance in view of the commonly used second-order phase-locked loop that does not have zero steady-state error when the frequency ramp changes, and is applied to the semi- physical simulation platform of the new energy field station. By simulating the step changes of different frequencies and the changes of different frequency ramps, the grid-connected frequency modulation technology of new energy field stations is verified.