Coordinated Protection and Control Scheme for Smooth Transition from Grid-Connected to Islanded Mode of Microgrids

2019 ◽  
Vol 44 (2) ◽  
pp. 911-926
Author(s):  
Mehdi Farzinfar ◽  
Mostafa Jazaeri
Keyword(s):  
Smooth Transition ◽  
Control Scheme ◽  
Islanded Mode ◽  
Protection And Control ◽  
And Control

A Distributed Protection and Control Scheme for Distribution Network with DG

2013 ◽  
Vol 732-733 ◽  
pp. 628-633
Author(s):  
Bing Bing Tong ◽  
Gui Bin Zou ◽  
Ming Lei Shi
Keyword(s):  
Fiber Optic ◽  
Distribution Network ◽  
Fault Isolation ◽  
Fiber Optic Network ◽  
High Penetration ◽  
Control Scheme ◽  
Feeder Terminal Unit ◽  
Protection And Control ◽  
And Control ◽  
Optic Network

High penetration level of distributed generation (DG) connected to distribution network makes the protection and control in the traditional distribution network face great difficulties, so this paper proposed a protection and control technology based on advanced feeder terminal unit (AFTU). According to DGs capability and load, the scheme divides the distribution network into several zones in advance, each of which can operate in island mode. Circuit breakers (CB) together with AFTU are installed at the beginning of feeder, the border of two zones and the point of DG connection. AFTUs interconnect with each other through the fiber optic network. AFTU detects the local electrical quantities in real-time and exchanges information with others through the fiber optic network. It can locate the faulted zone quickly to achieve fault isolation and island operation according to local and neighboring information. The reclosing of CB and the control of reconnection of DG are also designed. The case analysis illustrates the feasibility of the proposed distributed protection and control scheme.

A Dual-Processor Based Coordinator for Micro-Grid Control and Protection

2012 ◽  
Vol 614-615 ◽  
pp. 1677-1684
Author(s):  
Dong Liang Nan ◽  
Xiu Fan Le ◽  
Peng Peng Kang
Keyword(s):  
Smooth Transition ◽  
Regional Control ◽  
Islanded Operation ◽  
Novel Method ◽  
Micro Grid ◽  
Control Technologies ◽  
Protection And Control ◽  
And Control ◽  
Operational Modes ◽  
Area Data

With the development of micro-grid, the protection and control technologies for micro-grid have withdrawn broad attention. By analyzing the interactions between the micro-grid and the main grid, a dual-processor based coordinator is proposed in the paper. This coordinator achieves the functions of protection and control through two processors, utilizing the electrical information from the whole network, realizing the wide area data sharing and sound cooperation of the unit protection and regional control in the micro-grid. The proposed method enables smooth transition between grid-connected and islanded operation, which is adaptive to any operational modes. Implemented in a demonstrative project of the micro-grid in china, this novel method is verified to be efficient.

scholarly journals Design of protection and control scheme for hybrid nanogrid

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Sachin P. Jolhe ◽  
Gunwant A. Dhomane ◽  
Minal D. Karalkar
Keyword(s):  
Distribution System ◽  
Local Power ◽  
Power Capacity ◽  
Small Power ◽  
Local Loads ◽  
Input System ◽  
Control Scheme ◽  
Single Input ◽  
Protection And Control ◽  
And Control

AbstractNanogrid is “The new ray of hope” for people living in remote isolated locations as well as where power supply reliability is poor. A nanogrid is a small power capacity distribution system with the ability to operate standalone or with a utility grid. It consists of local power production supplying local loads and energy storage systems. In this paper, an innovative inverter design is presented, which converts the power in a single stage. It is superior to the traditional two-stage inverter system and can supply hybrid loads (AC and DC loads) with a single input. System AC and DC bus voltages are regulated under both steady-state and dynamic load variation conditions in the nanogrid. Simulation results are presented which confirm the suitability of the inverter and its control strategy for a hybrid nanogrid system.

scholarly journals Modelling and control of solid oxide fuel cell generation system in microgrid

2017 ◽  
Vol 68 (6) ◽  
pp. 405-414
Author(s):  
Niancheng Zhou ◽  
Chunyan Li ◽  
Fangqing Sun ◽  
Qianggang Wang
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Control Strategy ◽  
Response Speed ◽  
Solid Oxide ◽  
Smooth Transition ◽  
Oxide Fuel ◽  
Hysteretic Control ◽  
Islanded Mode ◽  
And Control

AbstractCompared with other kinds of fuel cells, solid oxide fuel cell (SOFC) has been widely used in microgrids because of its higher efficiency and longer operation life. The weakness of SOFC lies in its slow response speed when grid disturbance occurs. This paper presents a control strategy that can promote the response speed and limit the fault current impulse for SOFC systems integrated into microgrids. First, the hysteretic control of the bidirectional DC-DC converter, which joins the SOFC and DC bus together, is explored. In addition, an improved droop control with limited current protection is applied in the DC-AC inverter, and the active synchronization control is applied to ensure a smooth transition of the microgrid between the grid-connected mode and the islanded mode. To validate the effectiveness of this control strategy, the control model was built and simulated in PSCAD/EMTDC.

Novel Scheme of Fast Protection and Control for Feeder Automation

2013 ◽  
Vol 732-733 ◽  
pp. 899-904
Author(s):  
Gui Bin Zou ◽  
Hou Lei Gao
Keyword(s):  
Correct Identification ◽  
Distribution Grid ◽  
Feeder Automation ◽  
Fibre Network ◽  
Modern Distribution ◽  
Control Scheme ◽  
The Status ◽  
Optic Fibre ◽  
Protection And Control ◽  
And Control

This paper proposed a fast protection and control scheme of feeder automation (FA) for the modern distribution grid. The smart terminal unit (STU) is installed at each switchgear of the feeder, and STU has a directional over-current component. The adjacent STUs are connected each other by the optic fibre network, and ultimately they are all connected to the central station of FA. STU detects the local current and the status of breaker in real time, meanwhile exchanges the information with adjacent STUs. Through analyzing the information, STU can make a correct identification for a faulted section. Therefore, the faulted section can be isolated and power supply of non-faulted section can also be restored rapidly. Case analysis illustrates that the proposed fast protection and control scheme is valid and feasible.

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