scholarly journals Technology and application of operation control of DC distribution network

2021 ◽  
Vol 252 ◽  
pp. 01019
Author(s):  
Kuo Tan ◽  
Hai Wu ◽  
Guo Hu ◽  
Qi Huang
Keyword(s):  
Control Method ◽  
Rapid Development ◽  
Operation Mode ◽  
Distribution Network ◽  
Control Device ◽  
Network Control ◽  
Dc Distribution ◽  
Smooth Switching ◽  
Fault State ◽  
Loop Closing

DC distribution network consists of distributed generation, energy storage, load and AC distribution network, With the rapid development of DC distribution network and the increasing proportion of DC load, the operation mode of DC distribution network is more flexible. Different from the traditional AC distribution network, the traditional AC distribution network has a single operation mode, while the DC distribution network can operate in both parallel mode and island mode. Therefore, a control method suitable for different operation modes of DC distribution network is urgently needed. In this paper, a control method about loop closing and loop opening of DC distribution network is proposed. When receiving the command of loop closing or loop opening from the master station or local monitoring system, the loop closing control is judged by the switch state, fault state and operation state of converter. It solves the problem that the traditional AC distribution network control strategy is not applicable in DC distribution network, it realizes the smooth switching of DC distribution network closed loop operation and opened loop operation. This method has been used in the DC coordinated control device and successfully applied in the national key research and development plan of Suzhou active distribution network.

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.

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.

scholarly journals Technology and application of high speed fault location,isolation and self-healing in DC distribution network

2021 ◽  
Vol 256 ◽  
pp. 01042
Author(s):  
Kuo Tan ◽  
Guo Hu ◽  
Hai Wu ◽  
Feng Huang
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Fault Location ◽  
Reactive Power ◽  
Operation Mode ◽  
Distribution Network ◽  
Self Healing ◽  
Continuous Increase ◽  
Dc Distribution ◽  
Flexible Operation

With the continuous increase of DC load, the research of DC distribution network has been developed rapidly. Compared with the traditional AC distribution network, DC distribution network has the advantages of less conversion times, high efficiency, low cost, simple control structure, no need to consider the frequency and phase and reactive power compensation equipment. Compared with AC distribution network, DC distribution network has more flexible operation mode and less power supply points However, the more flexible operation mode of DC distribution network also brings the problem of fault location and self-healing. The fault location, isolation and self-healing control strategy of AC distribution network can not be applied to DC distribution network. In this paper, a high-speed fault location, isolation and self-healing method for DC distribution network is proposed. Based on high-speed goose communication, a comprehensive evaluation is carried out according to the fault status of the power grid, and the millisecond level fault location, isolation and self-healing of DC distribution network are completed. The coordinated control equipment based on this method is successfully applied in Tongli integrated energy service center. When the fault occurs in this area, uninterrupted power supply is realized in the non fault area, which verifies the correctness and practicability of this method.

scholarly journals Research on Cooperative Planning of Distributed Generation Access to AC/DC Distribution (Micro) Grids Based on Analytical Target Cascading

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1847 ◽  
Author(s):  
Hao Pan ◽  
Ming Ding ◽  
Rui Bi ◽  
Lei Sun
Keyword(s):  
Distributed Generation ◽  
Power Supply ◽  
Rapid Development ◽  
Distribution Network ◽  
Distribution Networks ◽  
Analytical Target Cascading ◽  
Distributed Power ◽  
Dc Distribution ◽  
Target Cascading ◽  
Micro Grids

With the wide application of distributed generation (DG) and the rapid development of alternating current/direct current (AC/DC) hybrid microgrids, the optimal planning of distributed generation connecting to AC/DC distribution networks/microgrids has become an urgent problem to resolve. This paper presents a collaborative planning method for distributed generation access to AC/DC distribution (micro) grids. Based on the grid structure of the AC/DC distribution network, the typical interconnection structure of the AC/DC hybrid microgrid and AC/DC distribution network is designed. The optimal allocation models of distributed power supply for the AC/DC distribution network and microgrid are established based on analytical target cascading. The power interaction between the distribution network and microgrid is used to establish a coupling relationship, and the augmented Lagrangian penalty function is used to solve the collaborative programming problem. The results of distributed power supply allocation are obtained, solving the problem so that distribution generation with different capacity levels is connected to the power grid system in a single form.

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