Control method of DC side-discharging circuit of full power convertor
A technology of an unloading circuit and a control method, which is applied to output power conversion devices, conversion equipment for intermediate conversion to DC conversion, emergency protection circuit devices, etc., can solve the problems affecting the service life of DC side capacitors, DC side voltage fluctuations, Difficulty matching, etc.
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[0020] The present invention will be further described below in conjunction with the drawings and specific embodiments.
[0021] Figure 2 shows the direct-drive variable-speed constant-frequency wind power system to which the present invention is applied. First, the structure of the direct-drive variable-speed constant-frequency wind power system will be described. As shown in Figure 2, the wind turbine drives the permanent magnet synchronous generator 100, and the alternating current generated by the permanent magnet synchronous generator 100 is rectified by the generator-side converter 200 to obtain direct current. The DC-side capacitor C dc Play the role of stabilizing the DC side voltage, the unloading circuit 300 serves as a protection device for DC side overvoltage, and the grid side converter 400 inverts the DC power into AC power, and merges it into the power grid through the grid side filter inductance. Among them, the permanent magnet synchronous generator 100 can also u...
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