规模化风电场的故障特性对保护影响研究

Study on the protective effect of the fault characteristics of large-scale wind farm

随着风机的规模化投入,发生故障时其故障特性非常显著,并且与传统的电源有很大区别。而如今绝大多数风机侧的保护还是将风机作为普通电源来配置相应保护,可能造成保护不能可靠动作。因此在发生故障时,风机侧的继电保护能否可靠的动作就显得及其重要。而其中风电场的弱馈性对继电保护产生的影响尤为突出,前人只是做了大量的实验说明此特性对继电保护会产生影响但并有给出理论的依据,因此给出理论的依据来判断保护能否可靠的识别故障,故障定位,可靠跳闸就显得尤为重要。针对不同的故障类型不同的保护原理,给出了理论的依据,并在仿真中证明了理论的正确性,而后对风场侧保护给出合理化建议,使保护能够更加可靠的动作。

With the large-scale investment of wind turbine,the fault characteristics are very significant when the faults occur,and there is a great difference with the traditional power supply. At present,the vast majority of the fan side of the wind turbine protection considers it as an ordinary power to configure protection,then,it may cause the un-reliable protection action. So in the event of failure,it is important that whether the fan side of the relay protection is reliable action or not. The effect of weak wind generation airport on relay protection is particularly prominent,they just did a lot of experiments to illustrate the characteristics of impact and didn't offer the theoretical basis of relay protection,thus giving theoretical basis to judge whether the recognition of fault protection is reliable for fault location,and tripping is particularly important. According to the principle of protection of different fault types,the theoretical basis is given,and the correctness of the theory is verified in the simulation,and then,the wind side protection also gives some reasonable suggestions to make it more reliable.