Wind Power Network News: With the rapid development of DC transmission technology, its safety, stability, and operation are facing greater challenges, especially the high voltage resistance of new energy units in the vicinity of DC transmission has become the focus of attention.
In order to improve the safe and stable operation of large power grids, countries around the world have gradually carried out research on the fault voltage ride-through capability of new energy units. Leading power grid operators in various countries, such as the Australian Energy Market Commission (AEMC) and the US Federal Energy Management Commission, have made clear requirements for the high voltage ride-through capability of new energy generator sets based on the organizational structure of large power grids.
1 Australia
Australia first formulated the guidelines for the high voltage ride-through capability of wind turbines with real significance. The guidelines stipulate that when the voltage of the high-voltage side grid surges to 130% of the rated voltage, the wind turbines should be maintained for 60ms without going out of the grid; the grid voltage varies from When 130% of the rated value returns to 110% of the rated value, the unit needs to run for 900ms without interruption, and ensure that there is sufficient fault recovery current to support the overvoltage fault. Figure 1 shows the Australian high wear standard.
2 United States
The grid-connected guidelines for wind turbines in the United States require that when the grid voltage on the high-voltage side surges to 120% of the rated voltage, the wind turbine has the ability to continuously operate for 1 second without going off the grid; when the grid voltage rises to 118%, the wind turbine It has the ability to operate continuously for 2s without going off the grid; when the grid voltage rises to 115%, the wind turbine has the ability to operate without going off the grid for 3 seconds; when the high-voltage side grid voltage swells to 110% of the rated voltage, the wind turbine Possess the ability to work continuously without disconnecting from the network. Figure 2 shows the U.S. high-throughput grid-connected guidelines.
3 China
my country is also actively formulating standards for wind turbine high voltage ride-through, and in 2017 and 2018 respectively issued NB/T 31111-2017 “Wind Turbine High Voltage Ride Through Test Regulations” and GB/T 36995-2018 “Wind Turbine Generators” Test Procedure for Fault Voltage Ride Through Capability”, its Chinese standard GB/T
The national standard requires the use of resistance-capacitance voltage divider high-throughput equipment for wind turbine high voltage ride-through tests. Figure 3 shows the schematic diagram of the voltage boost device. The resistance-capacitor voltage divider high-throughput The principle of resistance-capacitance voltage division raises the voltage.
Post time: Aug-23-2021
