High-voltage ride-through device and method, including the converter system of the device
A high-voltage and current technology, applied in the field of converters, can solve the problems of low utilization rate of wind resources and power generation, many switching devices, complicated control, etc., so as to improve the utilization rate of wind energy, reduce system costs, and reduce switching devices.
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Embodiment 1
[0077] as attached figure 2 As shown, it is a structural block diagram of a power system using a nine-switch full power converter, which is used in wind power generation. The nine-switch converter module 2 includes a total of 9 switching devices S1 to S9, and its specific working principle is as follows: each switching cycle Ts is divided into T 1 , T 2 two periods. at T 1 within the time period, with figure 2 The switching devices S7, S8, and S9 in the circuit are closed, and the remaining switching devices form a converter, which is called a Line Side Converter (LSC, Line Side Converter). at T 2 within the time period, with figure 2 The switching devices S1, S2, and S3 in the circuit are closed, and the remaining switches form a converter, which is called a Generator Side Converter (GSC, GeneratorSide Converter). at T 1 During the period, space vector pulse modulation (SVPWM) is performed on the LSC to output a voltage U g , the GSC is in the zero-vector state at...
Embodiment 2
[0128] as attached Figure 5 As shown, an embodiment of a high voltage ride through method specifically includes the following steps:
[0129] S101) Real-time detection of the three-phase voltage amplitude of the grid 1, and the three-phase stator voltage amplitude of the motor 3;
[0130] S102) After detecting that the voltage of grid 1 has risen, according to the actual voltage of grid 1 based on the demand of formula (7), update the grid-side DC bus voltage distribution coefficient K in real time 1 , to ensure that the grid-side converter is controllable;
[0131] S103) According to the three-phase stator voltage (i.e. the voltage on the stator side) and the DC bus voltage distribution coefficient K 1 Determine and update the DC bus voltage distribution coefficient K on the machine side in real time 2 , and calculate the excitation current command value i according to formula (15) sd * , to ensure that the machine-side converter is controllable;
[0132] S104) Accordi...
Embodiment 3
[0150] An embodiment of a converter, specifically comprising: the high voltage ride-through device 100 described in Embodiment 1, and a nine-switch converter module 2 connected to the high voltage ride through device 100 .
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