低电压穿越

3 3.3 德国低电压穿越要求E.onrequirement in Germany Grid Code •2001年之前： ​ 德国电网上的风电机组在电网故障时都会切除。 •2001年： ​ 简单的Fault ride through的要求，实现故障后有功支持。 ​ AGO 1 （Advanced Grid Option 1） ​ Vestas解决：在定子回路接入电阻，150~200ms，无功功率不控制 •Before 2001, wind turbine may trip during grid disturbances. •At 2001: ​ Simple Fault ride through for post-fault active power output. ​ AGO 1 （Advanced Grid Option 1） 3.3 德国低电压穿越要求E.onrequirement in Germany Grid Code􀁺 •2003年之后： ​ E.on提出更高要求，Voltage tolerance curve 要求无功电流贡献以控制电压。 ​ AGO 2 （Advanced Grid Option 2） ​ 风电场本身有无功支撑能力，利于恢复，能够支撑电压。 •After 2003􀂾 ​ More requirements were asked by E.on. Reactive current is required to contribute for voltage control􀂾 ​ AGO 2􀂾 ​ Wind farm reactive power capability is required to suppurt the voltage restore. 3.3 德国低电压穿越要求E.onrequirement in Germany Grid Code 德国LVRT能力规定（高短路电流） LVRT requirement for High short-circuit current 3.3 德国低电压穿越要求E.onrequirement in Germany Grid Code 德国LVRT能力规定（低短路电流） LVRT requirement for low short-circuit current 3.3 德国低电压穿越要求E.onrequirement in Germany Grid Code •有功输出在故障切除后立即恢复并且每秒钟至少增加额定功率的20%。阴影区域中，有功功率每秒钟可以增加额定功率的5%。 •􀁺Active power output must resume immediately following fault clearing and be increased with a gradient of at least 20% of the rated power per second. Within the shaded area the active power increase can take place at 5% of the rated power per second. 3.3 德国低电压穿越要求 E.on requirement in Germany Grid Code 网络故障时，机组必须能够提供电压支持。如果电压降落幅度大于机端电压均方根值的10%，机组必须切换至支持电压。无功功率的提供必须保证电压每降落1%的同时无功电流增加2% With a disturbed network the generating units must support the voltage. If a voltage drop of more than 10% of the root mean square (r.m.s.) of the generator terminal voltage occurs the generation unit must be switched over to voltage support. The support of the network voltage must be provided within 20 ms after fault identification by providing reactive power at the generator terminals with a factor of 2% of the rated current per percent of the voltage drop. Switching back from voltage control to normal operation is possible after 3 seconds.