Protection of the Island Microgrid Based on Ocean Energy

With the continuous development and utilization of Marine resources, the island’s developments get more and more attention of the state, however, the island's power supply is always a bottleneck restricting the development of its economy. Microgrid as a kind of effective supply and use of distributed generation of power system, provides an effective solution for remote island power supply. There is a big difference in output characteristic from the power system, for the distributed power mostly use power electronic interface, which provides barriers to the protection of microgrid. The paper first introduces the structure and control mode of island microgrid based on wave energy power and currents can power generation, energy storage power, then analyzes the fault characteristics of the microgrid under different control, lastly summarizes the existing two types of microgrid relay protection method: the traditional overcurrent protection method and digital network protection method based on the communication.

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An Adaptive Differential Protection and Fast Auto-Closing System for 10 kV Distribution Networks Based on 4G LTE Wireless Communication

Future Internet ◽

10.3390/fi12010002 ◽

2019 ◽

Vol 12 (1) ◽

pp. 2 ◽

Cited By ~ 1

Author(s):

Wen An ◽

Jun Jie Ma ◽

Hong Yang Zhou ◽

Hong Shan Chen ◽

Xu Jun ◽

...

Keyword(s):

Control System ◽

Wireless Communication ◽

Power System ◽

Power Supply ◽

Distribution Networks ◽

Fault Isolation ◽

Differential Protection ◽

Current Differential Protection ◽

Protection And Control ◽

And Control

With the development of wireless communication technology and computer technology, more and more smart technologies have been applied in electricity distribution networks. This paper presents an adaptive current differential protection and fast auto-closing system for application in 10 kV distribution networks in China Southern Power Grid. The current differential protection can adaptively change its settings according to the topology change of the primary distribution networks, thus the system effectively reduces the operation and maintenance cost of the power distribution network. In order to restore the power supply for the healthy part of the 10 kV networks quickly after a power system fault is cleared, the protection and control system provides wide area control function for automatic fault isolation and automatic switching. The traditional overcurrent protection and control system have no fault location function, it may take several minutes or even hours to manually locate a fault and then restore the power supply. Compared with the protection and control system of the traditional 10 kV distribution networks, the system developed can locate and isolate faults within 900 ms (assuming that the operating time of the load switch is 700 ms), and can quickly restore power supply in less than one second after a power system fault is cleared.

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Stand-Alone Power System for Monitoring and Control of the Temperature

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.2570 ◽

2013 ◽

Vol 291-294 ◽

pp. 2570-2573

Author(s):

Florin Dragomir ◽

Otilia Elena Dragomir ◽

Adrian Oprea

Keyword(s):

Power System ◽

Power Supply ◽

Temperature Regulation ◽

Green Energy ◽

Financial Impact ◽

Monitoring And Control ◽

Honey Production ◽

Increase Productivity ◽

Alternative Sources ◽

And Control

The main objective of the article is to stimulate interest of the consumers for the green energy considering the environmental and the financial impact (in this case by increasing productivity) of this one. For these arguments, this article proposes a real application, with autonomy in the power supply, for control the temperature in the hive using energy from alternative sources (through a solar panel). The temperature regulation is controlled by a microcontroller. For setting the temperature of the hive some bees are used at the expense of honey production. If there would be no need to adjust the temperature of the hive bees when the hive would increase productivity (worker bees population and honey production).

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Research on Semi Physical Test System of PCU on Satellite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.2540 ◽

2011 ◽

Vol 295-297 ◽

pp. 2540-2543

Author(s):

Fang Fang Sun ◽

Wei Dong Ye ◽

Cai Ping Liang

Keyword(s):

Power System ◽

Power Control ◽

Power Supply ◽

Control Unit ◽

Test System ◽

Working Environment ◽

Control Software ◽

Physical Test ◽

Solar Battery ◽

And Control

Power control unit (PCU) is an important component of space power system on satellite; it provides power supply to main bus and regulates output status of solar battery array in light district. So it is very important to test the performance of PCU before equipped in satellite. A semi physical test system for PCU is developed in this paper, some Agilent simulators are used to simulate working environment of PCU, and control software is programmed to control these simulator as well.

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Power Management of AC/DC Hybrid Distribution Network With Multi-Port PET Considering Reliability of Power Supply System

Frontiers in Energy Research ◽

10.3389/fenrg.2021.721385 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xinxing Xu ◽

Wentao Huang ◽

Yan Hu ◽

Nengling Tai ◽

Yaming Ji ◽

...

Keyword(s):

Power System ◽

Power Electronics ◽

Power Supply ◽

Sequential Monte Carlo ◽

High Efficiency ◽

Distribution Network ◽

Control Mode ◽

Automation System ◽

Hybrid Power System ◽

Hybrid Power

In the current distribution network, photovoltaic, wind power, energy storage, and other distributed energy are widely connected, and the proportion of generalized DC load is rapidly increasing. With the development of power electronics technology, using multi-port power electronic transformer (PET) to achieve high-efficiency access of large-capacity AC/DC source and load is the current research hotspot, and AC / DC hybrid power supply is inevitable. The introduction of a large number of power electronics and the flexible coordinated control and complementary fault-tolerant advantages of PET bring challenges to the operation and maintenance management of the AC/DC hybrid power system. In this paper, the structure of the AC/DC hybrid power system with the multi-port PET cluster is introduced. Based on the idea of hierarchical and partitioned control, a three-layer and multi-time scale control mode of integrated automation system, PET cluster and PET controller is proposed; Aiming at the problem of reliability evaluation, a sequential Monte Carlo simulation method is proposed to simulate the AC/DC hybrid power system with the multi-port PET cluster. The influence of multi-port PET parallel cluster mode and port capacity limitation on the reliability of the power system is analyzed, and the effectiveness of the model and algorithm is verified. Finally, an example is given to verify that the proposed structure is conducive to improving the utilization level of renewable energy in the distribution network.

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