A New Topology for Simultaneous AC-DC Distribution with the same Line

2013 ◽  
Vol 732-733 ◽  
pp. 757-761 ◽  
Author(s):  
Li Zhang ◽  
Qing Yu ◽  
Lei Cao ◽  
Liang Zou ◽  
Tong Zhao
Keyword(s):  
Simulation Model ◽  
Power Flow ◽  
Detailed Comparison ◽  
Alternating Current ◽  
Iron Core ◽  
The Novel ◽  
Dc Power ◽  
Core Saturation ◽  
Dc Distribution ◽  
Distribution Scheme

A new topology for simultaneous AC-DC distribution along the same line is proposed in this paper to integrate DC power with the existing alternating current (AC) distribution, which incorporates a zigzag transformer and a boost chopper. The zigzag transformer is utilized to achieve either coupling or decoupling of the AC and DC power without sensible iron-core saturation due to voltage canceling out on one phase. The boost chopper is used to achieve DC power flow and keep the DC ratings at each node. A simulation model of the novel topology is established with PSCAD software, and detailed comparison verifies that the new topology with a zigzag transformer is preferable to that with a common transformer for simultaneous AC-DC distribution scheme, indicating a promising future of the proposed technology.

A Novel Method of Core Saturation Suppression for the AC+DC Distribution Network Transformer

2014 ◽  
Vol 960-961 ◽  
pp. 680-683
Author(s):  
Meng Qi Liu ◽  
Li Zhang ◽  
Jie Lou ◽  
Liang Zou ◽  
Tong Zhao
Keyword(s):  
Renewable Energy ◽  
Simulation Model ◽  
Future Study ◽  
Smart Grids ◽  
Rapid Development ◽  
Distribution Network ◽  
Iron Core ◽  
Core Saturation ◽  
Dc Distribution ◽  
Novel Method

With the rapid development of smart grids, the interconnection between the grid and distributed renewable energy is the inevitable trend of future study. Because of the existence of the DC source in the combined AC-DC distribution network, the transformer iron core is easily saturated generating lots of harmonics and increasing the loss of the transformer. This paper presents a novel method based on inductive filtering technology of core saturation suppression of the transformer in the combined AC-DC distribution network, this novel method can suppress the harmonics caused by the flux saturation and forbid the harmonics intruding into the ac grid. In the end we build the simulation model to prove the correctness and practicability of this novel method.

A Multiport Embedded dc Power Flow Controller for Meshed dc Distribution Grids

2021 ◽  
pp. 1-1
Author(s):  
Jianwen Zhang ◽  
Weixin Fang ◽  
Jiacheng Wang ◽  
Jianqiao Zhou ◽  
Gang Shi ◽  
...  
Keyword(s):  
Power Flow ◽  
Dc Power ◽  
Dc Distribution ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Distribution Grids

scholarly journals A Full-Newton AC-DC Power Flow Methodology for HVDC Multi-Terminal Systems and Generic DC Network Representation

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1658
Author(s):  
Leandro Almeida Vasconcelos ◽  
João Alberto Passos Filho ◽  
André Luis Marques Marcato ◽  
Giovani Santiago Junqueira
Keyword(s):  
Power Systems ◽  
Direct Current ◽  
Power Flow ◽  
Large Scale ◽  
Flow Problem ◽  
Control Strategies ◽  
Problem Formulation ◽  
Expansion Planning ◽  
Dc Power ◽  
Power Flow Problem

The use of Direct Current (DC) transmission links in power systems is increasing continuously. Thus, it is important to develop new techniques to model the inclusion of these devices in network analysis, in order to allow studies of the operation and expansion planning of large-scale electric power systems. In this context, the main objective of this paper is to present a new methodology for a simultaneous AC-DC power flow for a multi-terminal High Voltage Direct Current (HVDC) system with a generic representation of the DC network. The proposed methodology is based on a full Newton formulation for solving the AC-DC power flow problem. Equations representing the converters and steady-state control strategies are included in a power flow problem formulation, resulting in an expanded Jacobian matrix of the Newton method. Some results are presented based on HVDC test systems to confirm the effectiveness of the proposed approach.

A Novel Interline DC Power-Flow Controller (IDCPFC) for Meshed HVDC Grids

2016 ◽  
Vol 31 (4) ◽  
pp. 1719-1727 ◽  
Author(s):  
Wu Chen ◽  
Xu Zhu ◽  
Liangzhong Yao ◽  
Guangfu Ning ◽  
Yan Li ◽  
...  
Keyword(s):  
Power Flow ◽  
Dc Power ◽  
Flow Controller ◽  
Power Flow Controller

Transmission Network Expansion Planning with Security Constraints and Uncertainty in Load Specifications

2008 ◽  
Vol 9 (4) ◽  
Author(s):  
Ashu Verma ◽  
Pradeep R. Bijwe ◽  
Bijaya Ketan Panigrahi
Keyword(s):  
Power Flow ◽  
Planning Problem ◽  
Transmission Network ◽  
Network Expansion ◽  
Security Issues ◽  
Expansion Planning ◽  
Dc Power ◽  
Sample Test ◽  
Binary Genetic Algorithm ◽  
Long Range Planning

Transmission network expansion planning is a very critical problem due to not only the huge investment cost involved, but also the associated security issues. Any long range planning problem is confronted with the challenge of non-statistical uncertainty in the data. Although large number of papers have been published in this area, the efforts to tackle the above mentioned security and uncertainty issues have been relatively very few, due to the formidable complexity involved. This paper tries to bridge this gap by proposing a technique to tackle these problems. Boundary DC power flow is used to ascertain the worst power flows on the lines. A simple basic binary Genetic algorithm is used to solve the optimization problem as an illustration. Results for two sample test systems have been obtained to demonstrate the potential of the proposed method.

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