Current-type multi-level converter system for wind power integration
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The invention discloses a current-type multi-level converter system for wind power integration. The system is characterized by comprising a main circuit and a control circuit, wherein the main circuit comprises a rectifier circuit and an inverter circuit. The system has the advantages that: the multi-level converter system has the characteristics of large power capacity, low switch frequency, small output harmonic, high electromagnetic compatibility and the like, the output performance of the converter system is improved while the capacity is increased, and the output current of a current source-type converter is easy to control; overcurrent and short-circuit protection is easy to realize and the work is more stable and reliable; direct current-side inductance has a function of increasingvoltage, the front-end power supply voltage is allowed to be relatively low, and therefore the range of available wind speed is expanded; meanwhile, the topology of the current-type converter is relatively simple and thus the cost of a wind power system is reduced.