Frequency coordinated control strategy of HVDC sending system with wind power based on situation awareness.

With the large-scale wind power, centralised access to high-voltage direct current (HVDC) asynchronous interconnected sending system, the random fluctuation of wind energy increases the uncertainty of frequency regulation. A frequency coordinated control (FCC) strategy based on situation awareness is proposed to make full use of the frequency regulation potential of wind turbines and HVDC transmission. Firstly, the influence of wind power permeability and HVDC power ratio on frequency regulation capability is analysed, and the mathematical model of FCC is established. Secondly, based on the information of FCC obtained by wide-area measurement system and data acquisition system, a non-linear mathematical prediction model is constructed, and the frequency response in finite time domain is predicted according to the frequency deviation and its change rate. According to the results of the prediction, the parameters of FCC are dynamically adjusted to realise the whole process variable objective optimal control on the time scale of primary frequency regulation. Finally, the simulation results show that the maximum frequency deviation of the proposed control method is reduced by about 46.6% and the frequency callback time is reduced by about 11.6% compared with the traditional control method with fixed parameters under the same disturbance. [ABSTRACT FROM AUTHOR]