Research Of Reactive Power Compensations And Controls In UHVDC Transmission Systems

In Ultra High Voltage Direct Current(UHVDC) transmission system, both rectifier and inverter consume numerous reactive power. To ensure the stability of both converter station and ac system, it is essential to research and calculate converter station's reactive power consumption, compensation and control.In this paper, classic reactive theory of traditional HVDC is given. Based on this theory, reactive power consumption in UVHDC is calculated, then the strategy of ac filter switch in and out is given. It also calculates the big alpha and gamma.Meanwhile, the converter transformer's tap changer and it's synchronous control is calculated and analyzed.