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Transient analysis is key point for studying on Doubly-Fed Induction Generator (DFIG) for Low Voltage Ride Through(LVRT). Lots of assumptions and approximations are made in conventional analysis, such as ignored stator resistance or rotor fixed voltage. It cannot accurately describe the transient performance. In this paper, according to the mathematical model of DFIG, transient characteristic is analyzed...
In this paper, we propose a method to predict ultra-short term wind power production with chaotic time series. Through analysis of the data measured from real wind farm, the ultra-short term prediction model of wind power is established based on the space theory of chaotic time series phase. The wind power of a real wind farm in northeast China in some future time including 15 m, 30 m and 1h are predicted...
This paper studies Modular Multilevel Converter (MMC) which is applied to Direct-drive wind power system. With the actual situation of wind power generation system, there is a control method presented. It is appropriate for an arbitrary number of voltage levels and the frequency of the AC side waving in a larger changing range. The method of determining the capacitance parameters in submodules is...
The analysis of the dynamic process is with vital importance to the security of power system. The model and parameter recognizing is prerequisite for the exact simulation of the process. As the models and parameters used in the simulation are not accurate, the simulation result will not cope with the real system trajectory. With the rapid development of wide area measurement system (WAMS), some real...
Controlling voltage balancing of flying-capacitor multilevel inverter is very important for safe operation. Duty-cycle-regulation based PWM control is proposed, which can suppress capacitor voltage shifts caused by asymmetry of inverter installation such as delay mismatch of triggering pulses, and can also balance voltage distribution of capacitors when supply voltage increases abruptly in about two...
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