柔性直流电网站间协调控制功能及稳控配合研究

Research on inter-station coordinated control and stability control cooperation in flexible DC grid

张北柔直电网工程是世界首个柔性直流电网试验示范工程,由于电力电子设备过载能力相对较弱,且单站容量可达直流电网容量的三分之一,为了保证直流电网的安全稳定运行,在张北柔直电网工程中配置了站间协调控制主机以实现四站之间的相互配合,确保在各种扰动情况下直流电网潮流和电压处于可控的工作状态,同时在站间协调控制主机中实现柔性直流电网功率传输极限能力的计算,为交直流混联运行时稳控系统切除新能源提供依据。

Zhangbei flexible DC grid project is the first flexible DC grid demonstration project in the world.Due to the weak overload ability of electronic device,and the single station capacity can reach 1/3 of the DC grid capacity,in order to ensure the safe and stable operation of the DC grid,the inter-station coordinated control system is configured in this project.This system realizes the cooperation between the four stations to ensure the stability of power flow and voltage under various disturbance conditions.At the same time,the power transmission limit capacity of the DC grid is calculated in the coordinated control system,which provides a basis for the stability control system to cut off new energy during the AC/DC hybrid operation.