Transient response improvement of direct current using supplementary control based on ANFIS for rectifier in HVDC

Abstract

Current control scheme is commonly used in high voltage direct current (HVDC) to transmit power delivery. This scheme is done by adjusting trigger angle to regulate direct current (DC) in thyristor devices. The adaptive neuro-fuzzy inference system (ANFIS) control is widely applied for start and fault operation. But, solution for transient response of DC current in HVDC system is not clearly studied before. In this paper, supplementary control (SC) based on ANFIS is proposed to improve the transient response of the current. The SC control is designed by learning-processes and SC parameters are obtained by data-training automatically. For current reference at 1.05 pu and up-ramp at 20 pu/s, maximum overshoot is achieved at 5.12% and 7.72% for the SC and proportional integral controller (PIC), respectively. When the up-ramp is increased to 28 pu/s, the maximum overshoot is achieved at 10.01% for the SC. While, the peak overshoot for the PIC is 14.28%.

Modeling of static var compensator-high voltage direct current to provide power and improve voltage profile

“…In the system HVDC and FACTS devices, due to less insulation and resistance DC less than AC, fewer losses [58], the need for two conductors in the system and as a result of the volume and space of the less to install, reduce of the thickness and cross-section of the cable in a certain power, use of the ground as a return wire, it has lower costs than HVAC, which in Figure 4, we see the difference in costs based on references [59], [60]. Moreover, the HVDC is able to improve stability of inter-connected HVAC by modulating power in response to small/large disturbances [61]. The DC terminals will always be more expensive than AC terminals simply because they have to have the components to transform DC voltage as well as convert the DC to AC.…”

Research on fault adaptive fault tolerant control of distributed wind solar hybrid generator

“…In order to make the measurement signals of the rotor current observer and the rotor current sensor independent of each other and to ensure that the accuracy of the observer is not affected after a failure of the rotor current sensor, a rotor current observer based on a reduced order observer is constructed by assuming that the rotor current is not measurable [25], [26]. In this case, the unmeasurable part of the state variable becomes ir(k) and the directly measurable part is is(k).…”

Perbaikan Stabilitas Dinamik Sistem Tenaga Terintegrasi Pembangkit Listrik Tenaga Mikro Hidro dan Diesel Menggunakan PSS Berbasis ANFIS

“…Penelitian aplikasi kecerdasan buatan pada kontrol STL telah dilakukan seperti: Perbaikan stabilitas tegangan menggunakan metode adaptive neuro-fuzzy inference system (ANFIS) (Ginarsa dkk, 2013), perbaikan stabilitas mesin tunggal (Ginarsa dkk, 2014), sistem multimesin (Muljono dkk, 2015) menggunakan ANFIS, dan fuzzy tipe-2 (Ginarsa dkk, 2018), menekan arus transient pada sistem high voltage direct current (Ginarsa dkk, 2018;2019;2020). Sementara itu, pemasangan PSS konvensional pada SKL telah mampu memperbaiki stabilitas sistem tersebut (Nrartha dan Muljono, 2010).…”