High-voltage fault ride-through device, method and system of wind turbine generator

Abstract

The invention provides a high-voltage fault ride-through device, method and system of a wind turbine generator. The high-voltage fault ride-through device comprises a series resistor, a parallel resistor, a bypass switch, a short-circuit switch and a control chip. The series resistor is connected in series between a boosting transformer and the wind turbine generator; the bypass switch is connected with the series resistor in parallel; one end of a circuit formed by connecting the parallel resistor and the short-circuit switch in series is connected to a machine end measuring point, and the other end of the circuit is grounded; the control chip is electrically connected with the bypass switch and the short-circuit switch and used for controlling the on-off state of the bypass switch and / orthe short-circuit switch based on the voltage, monitored by the machine end measuring point, of the wind turbine generator, thereby achieving high-voltage fault ride-through of the wind turbine generator. On the premise that a wind turbine generator body and a control strategy thereof are not changed, the method for reducing the generator end voltage of the wind turbine generator based on impedance voltage division and high-resistance short circuiting is provided. The device, method and system are simple and easy to implement, quite convenient to configure and install and free of limitation of places and models.

Description

technical field [0001] The invention relates to the field of fault ride-through of new energy generating sets, in particular to a high-voltage fault ride-through device, method and system for wind turbines. Background technique [0002] With the increasing awareness of environmental protection and the rapid development of wind power generation, the proportion of wind power in the power system continues to rise. However, the grid-connected performance of wind power has an increasingly important impact on the security and stability of the power grid. However, due to the intermittent and random nature of wind farm power generation, large-scale wind power off-grid accidents occur frequently. Taking China as an example, there were 193 off-grid accidents in 2011, including 12 off-grid accidents that lost more than 500MW of wind power output. These include not only wind power off-grid caused by low voltage, but also wind power off-grid caused by high voltage. In addition, when UHV...

AI Technical Summary

Problems solved by technology

[0003] The reason for the high-voltage off-grid of wind turbines involves many aspects such as reactive power control of wind farms, fault ride-through control of wind turbines, and structure of sending lines. there is a certain gap

Relying on wind turbine manufacturers to transform the wind turbines that have already been connected to the grid to meet the requirements of the grid through transformation not only has technical difficulties and economic pressure, but also requires a lot of time for transformation. Therefore, it is not realistic to transform the wind turbines that have been connected to the grid. The high voltage ride-through of wind turbines urgently needs to be solved

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