Voltage stability improvement of wind power grid-connected system using TCSC-STATCOM control

Aiming at the voltage stability problem of wind power grid-connected systems, a cooperative control scheme of Thyristor Controlled Series Compensator (TCSC) and Static Synchronous Compensator (STATCOM) is proposed in this study. The proposed scheme is applied in the wind power grid-connected system, a combined control strategy based on STATCOM double closed-loop feedback control and TCSC device is used to ensure that the system has enough reactive power to maintain its normal work during operation. The corresponding simulation model of wind power grid-connected system is built in MATLAB/Simulink. By analysing and comparing the waveforms of the operating examples with only TCSC, only STATCOM and TCSC-STATCOM, it is shown that the cooperative control of TCSC and STATCOM can quickly and effectively recover the bus voltage at the point of grid-connected wind farms after fault, which has a good performance on improving the voltage stability of wind power grid-connected system and increasing the low-voltage ride-through capability, and the cooperative control effect of TCSC and STATCOM is better than only using the control of TCSC or STATCOM.