Research And Simulation Of Low Voltage Through Capability Detection Technology In Wind Farm

Due to the increasingly serious energy crisis and environmental degradation problems, wind power as a kind of clean renewable energy, more and more get the attention of people, in recent years, with the large-scale centralized grid for the construction of wind farms, wind power capacity accounted for the proportion of power system is more and more bigger, by 2014, wind turbines interconnection has a capacity of 3.223 million kilowatts in Yunnan province, distributed over all of the province. As the large-scale wind power grid, the mutual influence between wind turbines and power grid is more and more bigger, the influence of wind power on power grid security and stability cannot be ignored. For fan "net" off in recent years, frequent accidents, grid related department puts forward the ability of the wind turbine low voltage across, only the wind turbines that can satisfy the standard of low voltage through can run out of power grid. Therefore, this article study the field detection technology research on the low voltage through of wind turbines, mainly including the following contents:First, analyze the working principle of the low voltage generator of the current mainstream, finally get the conclusion that using the theory of impedance differential pressure to implement low wear detection device has obvious advantages.Second, on the basis of the first analysis, rely on the project of low voltage ride-through detection device, and design form a complete set of field test plan, the detection circuit is built in a wind farm in Yunnan province, and conduct the site inspection work. The test content including:Design and simulate the specified voltage drop level matches with the needed reactor gear, wind turbines no-load test and wind turbines load low voltage through the test.Third, in-depth analysis the test results of various trials on the spot, finally get the conclusion that the detection device can completely fit for wind turbines low voltage ride-through ability in-situ test, no matter from the duration of voltage sags and device accuracy and precision of voltage drop depth, compare with other domestic similar equipment, it has obvious advantages.Fourth, on the basis of field test results, using the simulation software of Digsilent Power Factory, through constructing the simulation model of relevant wind turbines low voltage through test, simulate and check the dynamic behavior of the control strategy and the way for the process of low voltage ride-through, finally obtain the simulation model and parameters on the corresponding test system analysis of the unit with low voltage ride-through.