Double-feed current transformer with reliable low-voltage ride-through capability

Abstract

The invention relates to a double-feed current transformer with perfect and reliable low-voltage ride-through capability, which consists of a rapid internetworking switch GK, a direct-current unloading unit DBU, a stator side dynamic power consuming unit DPC, a transient reactive current compensation unit TSTATCOM, an AC / DC (alternating-current / direct-current) rectification switch EK, a filter, a PWM (pulse-width modulation) rectification network side current transformer GSC, a rotor side inverter transformer RSC and a controller KZQ. The double-feed current transformer is provided with a port A, a port B and a port C, wherein the port A is connected with a stator of a double-feed wind-driven power generator, the port B is connected with a power grid, and the port C is connected with a rotor of the double-feed power generator; the stator side dynamic power consuming unit DPC is connected with the stator of the double-feed power generator through the port A, the direct-current unloading unit is connected with public direct-current buses of the GSC and the RSC, the transient reactive current compensation unit TSTATCOM is connected with the power grid side, the alternating-current end of the AC / DC rectification switch EK is connected with the stator of the double-feed power generator, and the direct-current end of the AC / DC rectification switch EK is connected with the public direct-current buses; and the working state of each part of the double-feed current transformer is controlled by signals transmitted by the controller KZQ.

Description

technical field [0001] The invention designs a doubly-fed wind power generating set converter device with perfect low-voltage ride-through function, which is suitable for doubly-fed wind power generating set. Background technique [0002] With the rapid development of wind power generation, the installed capacity of wind power is constantly increasing, and the proportion of wind power in the power generation capacity is also increasing. When the proportion of wind power installed capacity in the power system is relatively large, after a power system fault causes a voltage drop, the removal of the wind farm will seriously affect the stability of the system operation. Studies have shown that when wind turbines have low voltage ride through (Low Voltage Ride Through, LVRT) capabilities, the stability of the entire power system can be improved. Therefore, countries with a large proportion of wind power installed capacity in the world, such as Denmark, Germany, and the United St...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a novel doubly-fed wind turbine with perfect low-voltage ride-through capability in order to solve the problems of large impact torque and poor reliability during low-voltage ride-through when the grid voltage drops. Doubly-fed converter and its control method, applicable to various doubly-fed generating sets

Images