scholarly journals A Carrier-based Two-Phase-Clamped DPWM Strategy With Zero-Sequence Voltage Injection for Three-Phase Quasi-Two-Stage Buck-Type Rectifiers

2021 ◽  
pp. 1-1
Author(s):  
Junzhong Xu ◽  
Thiago B. Soeiro ◽  
Yang Wu ◽  
Fei Gao ◽  
Yong Wang ◽  
...  
Keyword(s):  
Two Stage ◽  
Two Phase ◽  
Three Phase ◽  
Zero Sequence ◽  
Zero Sequence Voltage

scholarly journals A two‐stage model predictive control with zero‐sequence voltage injection for a three‐level T‐type inverter

2021 ◽  
Vol 14 (14) ◽  
pp. 2389-2399
Author(s):  
Yechun Xin ◽  
Yanxu Wang ◽  
Gang Wu ◽  
Shouqi Jiang ◽  
Weiru Wang ◽  
...  
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Stage Model ◽  
Two Stage ◽  
Zero Sequence ◽  
Zero Sequence Voltage

scholarly journals Analisis Pengaruh Kompensasi Impedansi Urutan Nol (Kzn) terhadap Kehandalan Sistem Proteksi Rele Jarak (Distance Relay) pada Penghantar Harapan Indah di Gardu Induk Plumpang

2021 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Deni Almanda ◽  
Juniyanto Juniyanto
Keyword(s):  
Single Phase ◽  
Short Circuit ◽  
Relay Protection ◽  
Protection System ◽  
Distance Relay ◽  
Two Phase ◽  
Test Tool ◽  
Three Phase ◽  
Zero Sequence ◽  
Short Circuit Fault

Pada saat terjadi gangguan hubung singkat di saluran transmisi Gardu Induk Plumpang, rele jarak berfungsi sebagai proteksi utama. Penelitian ini bertujuan untuk mengetahui pengaruh kompensasi impedansi urutan nol (kzn) terhadap kehandalan sistem proteksi rele jarak (distance relay) pada penghantar harapan indah di Gardu Induk Plumpang. Setting rele jarak yang didapatkan dari PT PLN (Persero) UPT Pulogadung disimulasikan menggunakan alat uji Omicron. Hasil simulasi gangguan hubung singkat satu fasa, gangguan hubung singkat dua fasa, dan gangguan hubung singkat tiga fasa menggunakan setting lama Z1 = 2.58 Ω, Z2 = 3.87 Ω, dan Z3 = 7.30 Ω, kZn = 0.93 Ω < -0.4° rele jarak tidak bekerja selektif, maka dilakukan resetting. Hasil resetting rele jarak yaitu Z1 = 2.58 Ω, Z2 = 3.87 Ω, dan Z3 = 7.30 Ω, kZn = 0.68 Ω < -0.6°. Setelah dilakukan resetting dan disimulasikan gangguan hubung singkat satu fasa, gangguan hubung singkat dua fasa, dan gangguan hubung singkat tiga fasa, rele jarak bekerja secara handal. Kesimpulannya kZn dapat mempengaruhi kehandalan sistem proteksi rele jarak pada penghantar harapan indah di Gardu Induk Plumpang.In the event of a short circuit in the transmission line of the Plumpang Substation, the distance relay serves as the main protection. This study aims to determine the effect of zero sequence impedance compensation (kzn) on the reliability of the distance relay protection system at the Harapan Indah conductor at the Plumpang Substation. The distance relay setting obtained from PT PLN (Persero) UPT Pulogadung was simulated using the Omicron test tool. Simulation results of single phase short circuit, two phase short circuit, and three phase short circuit using the old setting Z1 = 2.58 Ω, Z2 = 3.87 Ω, and Z3 = 7.30 Ω, kZn = 0.93 < -0.4° relay distance does not works selectively, then resetting is done. The results of resetting the distance relay are Z1 = 2.58 Ω, Z2 = 3.87 Ω, and Z3 = 7.30 Ω, kZn = 0.68 < -0.6°. After resetting and simulating single-phase short circuit, two phase short circuit, and three phase short circuit fault, the distance relay works reliably. In conclusion, kZn can affect the reliability of the distance relay protection system on the beautiful hope conductor at the Plumpang Substation.

Method for determining the zero-sequence voltage of a three-phase network with error correction

2020 ◽  
Vol 0 (1) ◽  
pp. 17-23
Author(s):  
Анатолій Андрійович Щерба ◽  
Дмитро Костянтинович Маков ◽  
Валерій Іванович Чибеліс
Keyword(s):  
Error Correction ◽  
Three Phase ◽  
Zero Sequence ◽  
Zero Sequence Voltage

Analysis of 220kV Transformer Tripping Accident Caused by Neutral Point Gap Breakdown

2013 ◽  
Vol 310 ◽  
pp. 387-390
Author(s):  
Gang Chen ◽  
Qing Hao Wang ◽  
Yu Xia Huang ◽  
Gang Li ◽  
Shao Yong Wu ◽  
...  
Keyword(s):  
Wave Process ◽  
Neutral Point ◽  
Protection Device ◽  
Two Phase ◽  
Phase Wave ◽  
Three Phase ◽  
Zero Sequence

Through the neutral point of the main transformer is breakdown gap under the lightning over-voltage, and the main transformer is tripped by the zero-sequence protection, the discharge dispersion of gap is large is indicated; When 220kV neutral point is ungrounded ,the protection must be sharing after arrester parallel gap is proposed. The two-phase or three-phase wave is the main reason of the protection device action are pointed by discussing the wave process in the transformer; The most simple and effective way is placing special transparent insulating over the gap is proposed.

scholarly journals Design Methodology for Three-Phase Four-Wire T-Type Inverter With Neutral Inductor

2021 ◽  
Vol 6 (1) ◽  
pp. 93-105
Author(s):  
Li Zhang ◽  
Keyword(s):  
Resonant Frequency ◽  
Design Methodology ◽  
Neutral Current ◽  
Low Frequency ◽  
Current Loop ◽  
Three Phase ◽  
Zero Sequence ◽  
Resonant Controller ◽  
Zero Sequence Voltage ◽  
Unbalanced Loads

Three-level (3L) converters have been widely used in industry for decades. Compared to the three-phase-three-wire (3P3W) 3L inverter, the three-phase-four-wire (3P4W) one is able to supply the unbalanced loads but has to afford much larger filter inductors because the neutral wire provides a path for high-switching zero-sequence currents. To save filter inductances, a neutral inductor is proposed to insert in the neutral wire. Meanwhile, a complete design methodology is put forward to design the filter inductors and the neutral inductor. With low-frequency zero-sequence currents flowing through the neutral wire, the three-phase load voltages might become unbalanced and/or distorted. To improve the voltage quality, a resonant controller, with the resonant frequency at fundamental output frequency (fo), is presented to add into the zero-sequence voltage loop for balancing load voltages; concurrently, the other resonant controller, with the resonant frequency at 3fo, is presented to insert in the zero-sequence voltage loop or neutral current loop for mitigating voltage distortion. Finally, all of the proposed works are verified on a 3P4W T-type inverter.

Leakage Failure and Principle of Underground Low Voltage Grid

2012 ◽  
Vol 214 ◽  
pp. 254-258
Author(s):  
Jun Mei Geng ◽  
Chun Guang Li
Keyword(s):  
Low Voltage ◽  
Leakage Detection ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Detection Program ◽  
Three Phase ◽  
Zero Sequence ◽  
Power Direction ◽  
Leakage Failure ◽  
Zero Sequence Voltage

To describe the leakage protection of underground low voltage grid are based on zero-sequence voltage and zero sequence power direction of the current leakage protection and earth leakage protection based on the additional DC power supply two kinds. The paper gives the theoretical analysis of these two kinds of leakage, and unified the three-phase neutral point grounding system and by arc suppression coil grounding the under compensation leakage detection program, that provides a new approach for underground leakage detection.

Sign in / Sign up

Export Citation Format

Share Document