一种新型小水电安全自动解列装置的研究

Research on a new type of auto-disconnection safety for small hydroelectric power system

分析小水电地区,联络系统的主供线路故障跳闸后,小水电侧形成孤网运行,将出现高频、高压的工况,引起用户电器设备损坏,同时影响电网的检无压重合闸动作。针对此现象,在研究小水电现有过电压解列装置的不足与小水电接入系统的状况,提出了一种适用于小水电机组的解列装置。在过电压保护的基础上增加频率判据,在异常情况下快速准确地将小水电解列,以避免对用户电器设备的损坏,提高供电质量与系统运行可靠性。实际运行证明,这种小水电解列装置的使用能有效地解决孤网运行高频高压的危害,同时提高电网安全稳定性和供电可靠性。

In small hydroelectric power system, the main supply line fault of connected system leads to switch trip on both sides, then the small hydroelectric power system forms isolated network operation and it will appear high frequency and high pressure, which will damage electrical equipment of user, at the same time affect the check without pressure auto-reclosing of power systems. According to these phenomena and based on past research of over-voltage protection device and small hydropower status, this paper proposes a suitable splitting device for small hydropower. It is suggesed to install a new type of auto-disconnection safety for the small hydroelectric power system. It monitors the frequency and voltage of own of auto-disconnection safety in exceptional circumstances station and quickly disconnects itself from system in abnormal situations to avoid damage to electrical equipment and improve power supply quality as well as the reliability of the system operation. Experiments prove that the new method can improve the stability of the grid and the reliability of power supply.