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 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 Review of Distribution Network Planning with Large-Scale Intermittent Renewable Energy Access to Distribution Network

2014 ◽  
Vol 1008-1009 ◽  
pp. 723-728 ◽  
Author(s):  
Xu Dong Song ◽  
Nan Hua Yu ◽  
Jun Jun Liang ◽  
Cheng Jun Xia
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Rapid Development ◽  
Distribution Network ◽  
Research Direction ◽  
Absorption Capacity ◽  
Energy Access ◽  
Multiple Sources ◽  
Unique Source ◽  
The Cost

With the rapid development of DG, especially the access of large-scale renewable energy, traditional simple distribution network with unique source turns into ADN with multiple sources, making the distribution network more complicated. In this paper, The power source and grid planning of traditional and intelligent distribution network are discussed, based on which the problems ADN faces and the research difficulty are focused on. The key technology of ADN planning is analyzed, including the uncertainty of load forecasting, the ADN absorption capacity for DG and the cost-effectiveness of ADN planning. Some suggestions for the research direction of ADN in the future are made at the end, providing reference for the ADN planning with large-scale renewable energy access.

The Influence and Countermeasures Research of Large-Scale Distributed Photovoltaic Access to the Distribution Network

2014 ◽  
Vol 953-954 ◽  
pp. 61-65
Author(s):  
Jing Chao Zhang ◽  
Zheng Gang Wang ◽  
Feng Zhen Zhou ◽  
Ning Xi Song ◽  
Qian Wang
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Power Flow ◽  
Large Scale ◽  
Industrial Revolution ◽  
Simulation Analysis ◽  
Negative Impact ◽  
Rapid Development ◽  
Distribution Network ◽  
Photovoltaic Power

In recent years, with the gradual depletion of traditional energy, as renewable energy representatives, new energy has developed rapidly. We know that distributed photovoltaic power generation with clean, pollution-free, easy installation, and therefore has been rapid development. However, the large number of distributed photovoltaic power generation connected to the distribution network would have a negative impact on the grid with a safe and reliable operation because of its randomness and volatility intrinsic properties. In this paper, in terms of power flow, voltage distribution, load characteristics, power quality, system protection and reliability departure, through MATLAB simulation analysis, the distribution network transformation strategies of primary and secondary devices has been proposed. It laid an important foundation for renewable energy development and the Third Industrial Revolution.

A Combined AC+DC Distribution Network Interconnected with Renewable Energy

2014 ◽  
Vol 960-961 ◽  
pp. 676-679
Author(s):  
Dong Xin Hao ◽  
Li Zhang ◽  
Meng Qi Liu ◽  
Pan Ting Dong ◽  
Hao Wu
Keyword(s):  
Renewable Energy ◽  
Reactive Power ◽  
Voltage Drop ◽  
Electrical Power ◽  
Distribution Network ◽  
Transient State ◽  
Transient Effects ◽  
Line Voltage ◽  
Dc Power ◽  
Dc Distribution

The combined AC+DC distribution network in this study provides a coupling and decoupling strategy of renewable energy in DC mode by using zig-zag transformer, which makes each line transmit AC electrical power and DC power simultaneously. The proposed scheme is digitally simulated with the help of Simulink software package. Simulation results indicate lower line voltage drop and less active and reactive power loss in steady state; almost similar or even better transient effects in transient state, which demonstrates the feasibility of combined AC+DC distribution network of single line interconnected with renewable energy.

scholarly journals The LCOE-Indicator-Based Comprehensive Economic Comparison between AC and DC Power Distribution Networks with High Penetration of Renewable Energy

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4621 ◽  
Author(s):  
Yi Liu ◽  
Zhanqing Yu ◽  
Haibo Li ◽  
Rong Zeng
Keyword(s):  
Renewable Energy ◽  
Economic Evaluation ◽  
Power Loss ◽  
Distribution Network ◽  
Distribution Networks ◽  
Planning Stage ◽  
Stage Of Development ◽  
Dc Distribution ◽  
High Penetration ◽  
Economic Comparison

DC distribution networks are operationally economical from the perspective of renewable energy penetration due to the reduction of power loss from the simplified power conversion structure. However, the initial investment cost of a DC network is high because DC technology is in the early stage of development. So, selecting AC or DC technology becomes an important issue in the planning stage of a distribution network, where a comprehensive quantitative economic comparison between AC and DC distribution networks is necessary. To compare the economy between AC and DC distribution networks with high penetration of a renewable energy scenario, this paper introduces a comprehensive economic evaluation method. In this study, first, typical system models for AC and DC distribution networks were proposed as the foundation of the research. Then, a levelized cost of energy (LCOE)-indicator-based comprehensive economic evaluation model was established, where the operation cost was classified into power loss cost, reliability loss cost, and operational cost. A time sequential simulation model was applied to calculate the power loss. The simulation results showed that a DC distribution network has higher initial investment, operation, and maintenance costs than an AC distribution network, but the loss cost is far lower than an AC distribution network. A sensitivity analysis showed that the equipment cost and proportion of renewable energy are two of the most important factors that affect the economics of DC distribution networks at present.

scholarly journals Aquila Optimization Based Harmonic Elimination in a Modified H-Bridge Inverter

2022 ◽  
Vol 14 (2) ◽  
pp. 929
Author(s):  
Md Reyaz Hussan ◽  
Mohammad Irfan Sarwar ◽  
Adil Sarwar ◽  
Mohd Tariq ◽  
Shafiq Ahmad ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Simulation Model ◽  
Smart Grids ◽  
Output Voltage ◽  
Input Voltage ◽  
High Quality ◽  
Matlab Simulink ◽  
Multilevel Inverters ◽  
Harmonic Elimination ◽  
Wide Range

Multilevel inverters (MLIs) are capable of producing high-quality output voltage and handling large amounts of power. This reduces the size of the filter while also simplifying the circuitry. As a result, they have a wide range of applications in industries, particularly in smart grids. The input voltage boosting feature is required to use the MLI with renewable energy. Moreover, many components are required to get higher output voltage levels that add weight and cost to the circuit. Numerous MLI topologies have been identified to minimize the losses, device count, and device ratings. A seven-level modified H-bridge inverter with a reduced component count, and reduced THD is presented in this paper. Two DC sources with six IGBTs have been used to generate a seven-level output voltage, and the Aquila Optimizer (AO) has been implemented to get the regulated output. MATLAB/Simulink environment has been used for designing the simulation model. Furthermore, the simulation result has been validated in the laboratory on a hardware setup using the DSP-TMS320F28335 Launchpad. With the reduced number of switching devices as well as the dc supply, the size of the inverter is compacted and becomes more economical.

scholarly journals Modeling and Control Strategy for Multiterminal Flexible DC Distribution Network with Echelon Utilization Power Battery

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Min Mou ◽  
Yuhao Zhou ◽  
Wenguang Zheng ◽  
Yurong Xie ◽  
Shipeng Wang ◽  
...  
Keyword(s):  
Power Generation ◽  
Real Time ◽  
Control Strategy ◽  
Rapid Development ◽  
Storage System ◽  
Distribution Network ◽  
Dc Distribution ◽  
Power Battery ◽  
Ring Shape ◽  
And Control

With the integration of distributed renewable energy to the distribution network and the development of multiterminal flexible DC transmission technology, multiterminal flexible DC distribution network has broad application prospects. At the same time, with the rapid development of new energy vehicles, the echelon utilization of power battery has become a research hotspot. By analyzing the characteristics of flexible DC distribution network and echelon utilization battery, the structure and control strategy of modular multilevel converter (MMC), DC solid-state transformer, photovoltaic power generation, wind power generation, and echelon utilization battery energy storage system are established, respectively, in this paper. To achieve a DC network connection of various types of power supply and load, this paper proposes a starting method of multiterminal flexible DC distribution network and a cooperative control strategy of the wind-solar-storage system. A six-terminal ring-shape DC distribution network model is built in real-time digital simulation (RTDS) platform. The simulation results show that the modeling methods and control strategies of each component in the real-time simulation model meet the operation requirements of the multiterminal flexible DC distribution network, which provides a reference for the construction and research of the flexible DC distribution network.

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