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  • PCS-9561 Wind Energy Converter System

  • Due to the rapid development of computer science and control technologies, wind power technologies have also advanced at an equivalent rate. Wind power generation control methods have evolved from simplex constant pitch stall control to full blade variable pitch and variable speed control. At present, the doubly fed converter system with variable speed and constant frequency control is widely used in the wind power generation market.

    The rotor of PCS-9561 is excited by two back-to-back connected VSC converters with PWM. The doubly PWM converters supply excitation current to rotor winding in order to realize the maximum capture of wind energy and the adjustment of stator reactor power output. When the turbine operates at a sub-synchronous speed, power is fed into the rotor and the grid side converter runs as a rectifier while the rotor side converter runs as an inverter, providing the excitation current to the turbine. When the turbine operates at super- synchronous speed, stator and rotor can both feed energy to the grid. If the turbine operates in synchronous status, the generator runs as a synchronous motor and the converter system provides DC excitation to the rotor.

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  • Fast response capabilities and high control precision;
  • Complete fault recording function conformed to IEEE COMTRADE format;
  • High reliable and flexible integrated protection system;
  • Grid interconnection control strategy based on selfadaptive positioning of rotor can realize “zero” impulse grid synchronization;
  • Photo-electric encoder which adopts software reset mode can improve the accuracy and reliability of motor rotation speed acquisition;
  • High voltage and low voltage ride through control strategy are used to guarantee the converter fault ride through capability;
  • Harmonics suppression control strategy and dead zone compensation strategy are adopted to effectively ensure the quality of power delivered from converter to grid;
  • Compatible with various industrial fieldbus communication interfaces, such as CANopen and Profibus.
  • Identical IGBT converter bridge modules are connected in parallel, and installation and removal of each power module is convenient.
  • Elaborately designed filtering system and harmonics restraint control strategy ensure the superior quality of power delivered into grid.
  • The PCS-9561 can withstand high/low temperature and high humidity. Inside the cabinets, temperature and humidity sensors, and heating and dehumidifying measures are provided. All circuit boards are equipped with anti-corrosion coating and all cabinets have very high protection class.