High voltage ride-through method of doubly-fed wind turbine generator set
A wind turbine, high-voltage technology, applied in wind power generation, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc., can solve problems such as complex high-voltage ride-through methods
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, the system includes a grid-side converter, a machine-side converter, and a DC bus voltage discharge circuit. The DC bus voltage discharge circuit includes an IGBT, a DC discharge resistor R, and a diode. The diode and the IGBT are connected in reverse parallel to the DC The discharge resistor R is connected in series.
[0021] The system also includes a controller, which controls the switching elements in the converter connected to the grid side. The controller collects the AC voltage on the grid side and the actual value of the DC bus voltage at this time in real time, and then according to the program set inside the controller To control the on-off of the switching elements in the grid-side converter to achieve the purpose of increasing the DC side bus voltage, and then improve the controllable range of the AC side voltage...
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