A topological structure of offshore wind farm and its control method
A technology of topology structure and control method, applied in parallel operation of DC power supply, harmonic reduction device, AC network to reduce harmonics/ripples, etc., can solve the problems of high cost, large size of converter station and high operating loss
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[0050] A topological structure 100 of an offshore wind farm, such as figure 1 As shown, including: multiple offshore DC wind turbines, multiple offshore AC wind turbines, and combined converters;
[0051] The first DC port of the combined converter is connected to the first DC cable through the first current-limiting reactor, and then connected to each of the offshore DC wind turbines through the first DC cable; the AC port is connected through the AC cable Connected to each of the offshore AC wind farms; the second DC port is connected to the second DC cable through the second current-limiting reactor, and then externally connected to the onshore converter station through the second DC cable, for simultaneously collecting offshore DC The energy sent by the fan and the offshore AC fan is sent to the onshore converter station in the form of high-voltage direct current.
[0052] Such as figure 2 As shown in Fig. 1, the existing typical topology structure of offshore wind farm...
example 1
[0068] Example 1, the second converter unit 312 is composed of a twelve-pulse uncontrolled rectifier 312-1, a three-phase three-winding converter transformer 312-2, and a bypass switch 312-3. One winding of the three-phase three-winding converter transformer 312 - 2 is connected to the common AC bus 314 inside the combined converter 31 , and the common AC bus 314 is connected to the first AC port of the energy collection system 3 . The other two windings of the three-phase three-winding converter transformer 312-2 are respectively connected to the AC ports of the twelve-pulse uncontrolled rectifier 312-1. The bypass switch 312-3 is connected across the positive and negative busbars of the twelve-pulse uncontrolled rectifier 312-1, and is used to close when the second converter unit 312 fails, and bypass the second converter unit 312. to maintain the continuous operation of the non-faulty area of the combined converter 31.
[0069] The third converter unit 313 is composed of...
example 2
[0070] Example 2, such as Figure 7 As shown, the second converter unit 312 or the third converter unit 313 consists of a six-pulse uncontrolled rectifier 312-4, a three-phase double-winding converter transformer 312-5, and a bypass switch 312-6. One winding constituting the three-phase double-winding converter transformer 312 - 5 is connected to the common AC bus 314 inside the combined converter 31 , that is, the first AC port. The other winding of the three-phase two-winding converter transformer 312-5 is connected to the AC port of the six-pulse uncontrolled rectifier 312-4. The bypass switch 312-6 is connected across the positive and negative busbars of the six-pulse uncontrolled rectifier 312-4, and is used to close when the six-pulse uncontrolled rectifier 312-4 fails, so that the six-pulse uncontrolled rectifier 312-4 performs a bypass to maintain the continuous operation of the non-faulty area of the combined converter 31.
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