scholarly journals Analysis and research on optimal economic operation of cogeneration micro-grid based on heat pump control

2021 ◽  
Vol 25 (4 Part B) ◽  
pp. 2871-2879
Author(s):  
Wei Xia
Keyword(s):  
Objective Function ◽  
Power Supply ◽  
Large Scale ◽  
Power Grids ◽  
Economic Optimization ◽  
Operating Characteristics ◽  
Analytic Hierarchy ◽  
Large Power ◽  
Power Exchange ◽  
Micro Grid

When the micro-grid is connected to the grid, the influence of the load and the micropower supply?s operating characteristics may cause the power exchange between the micro-grid and the large grid to cause unnecessary losses. The objective function of power supply satisfaction of large power grids. The article takes the co?generation micro-grid as the research object. It proposes establishing an objective function including the satisfaction of micro-grid decision-makers, the satisfaction of social benefits, and the satisfaction of large-scale power supply using the analytic hierarchy process. After that, the article uses the particle swarm optimization algorithm combined with the typical dispatching strategy of the micro-grid to solve the aforementioned model with MATLas the primary tool, and obtains the 24 hour output optimization results of the micro-grid, and analyzes the results in detail. The calculation examples show that the model can achieve economic optimization based on satisfying the satisfaction of different groups, which verifies the scientificity and effectiveness of the proposed model.

Power Planning Model of Microgrid Based on Minimizing the LCC Cost

2013 ◽  
Vol 448-453 ◽  
pp. 2687-2694
Author(s):  
Hao Zhang ◽  
Shao Yu Tian ◽  
Zhong Jing Liu ◽  
Fang Chen
Keyword(s):  
Power Supply ◽  
Life Cycle Cost ◽  
Power Grids ◽  
Planning Problem ◽  
Large Power ◽  
System A ◽  
Micro Power ◽  
Micro Grid ◽  
Operational Constraints ◽  
Power Configuration

The development of micro-grid technology provides power system a variety of forms, flexible ways of power supply schemes, but a lot of basic micro-grid operational problems are different from the traditional large power grids, which need to be studied specifically. This paper studies the power planning problem of micro-grid, namely to meets the system operational constraints, study how to optimize the micro-power configuration of micro-grid, so that the whole micro-grid life cycle cost is the smallest.

Are High Renewable Energy Shares In Large Power Grids In Indonesia Too Expensive?

2019 ◽  
Vol 2 (1) ◽  
pp. 36-48
Author(s):  
Matthias Günther
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Power Supply ◽  
Renewable Resources ◽  
Storage Systems ◽  
Technical Problem ◽  
Developed Countries ◽  
Power Grids ◽  
Geothermal Resources ◽  
Large Power

High shares of power from renewable resources in large power supply grids do not imply insurmountable technical problem anymore. A question is rather whether, besides the technical feasibility, it is also economically viable to go for a high share of power from sun, wind, water, geothermal resources and biomass. This paper scrutinizes the costs of a renewable-energy based power supply in the Java-Bali grid, by far the largest grid in Indonesia. The study refers to a challenging power supply scenario in which 100% of the power in the Java-Bali grid comes from renewable resources. This scenario is expressed in a one-year modeling of the load and the respective power supply in the grid. The modeling identifies possible sets of installed capacities of the different power plant types and storage systems that allow the supply of the required electricity. A cost scenario is applied to these sets, which renders the system costs, and finally the power generation costs. All scenarios refer to the year 2050. The results show that, assuming moderate financing costs, the cost of the electricity generation in the possible supply systems would not be higher than that in currently existing systems in developed countries; and it would even not be far away from the power generation cost in the current Java-Bali grid. A secondary result of the study is that the usage of special long-term storage systems for the balancing of seasonal power supply fluctuations, additionally to pumped storages and batteries, is not economically necessary in the considered grid.

Research and Design of Multigrounded in Micro-Grid Power Supply with Analysis of Electricity Energy

2013 ◽  
Vol 648 ◽  
pp. 210-213
Author(s):  
Wen Xing Wang ◽  
Guang Zheng Wang
Keyword(s):  
Power Supply ◽  
Distribution Network ◽  
System Structure ◽  
Grid System ◽  
Operating Characteristics ◽  
Practical Point ◽  
Micro Grid ◽  
Research And Design

After a large number of distributed electricity energy has been accessed to network, the system structure and operating characteristics of the distribution network will be greatly changed. The multigrounding of the micro-grid system was discussed from the provisions of the relevant electrical standards and the view of practical point. It is clear that PE wire is the repeated grounding instead of N repeated grounding in the TN system of micro-grid, and multigrounding problems that should be attention were described in TN-S and TT systems of micro-grid.

Energy Management and Coordinated Control Strategies of Isolated Micro-Grid with Wind Turbines and Seawater Desalination Devices

2014 ◽  
Vol 672-674 ◽  
pp. 233-239
Author(s):  
Shi Tong Fan ◽  
Qing Liu
Keyword(s):  
Wind Power ◽  
Energy Management ◽  
Wind Turbines ◽  
Large Scale ◽  
Control Strategies ◽  
Coordinated Control ◽  
Seawater Desalination ◽  
Operating Characteristics ◽  
Analog Simulation ◽  
Micro Grid

The combined operation of large-scale off-grid wind turbines and energy-intensive seawater desalination devices will be one of the directions of the cleaner freshwater producing technology in the future. This paper discussed the operation modes and control strategies of isolated micro-grid with wind power, energy storage and seawater desalination equipments based on load characteristics of seawater desalination devices and operating characteristics of wind power, put forward energy management and coordinated control strategies to enhance the economical efficiency and stability of the system. Finally, a digital-analog simulation platform was build based on PXI+cRIO. The real-time simulations for various operating modes of this isolated micro-grid system verified the feasibility of the proposed strategies.

scholarly journals PMSG-Based Black-Start Technology and Its Field Tests

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2144
Author(s):  
Min-gang Tan ◽  
Yi Tang ◽  
Chaohai Zhang
Keyword(s):  
Field Test ◽  
Power Supply ◽  
Large Scale ◽  
Wind Farm ◽  
Thermal Power ◽  
Wind Farms ◽  
Power Grids ◽  
Diesel Generator ◽  
Supply Source ◽  
Power Supply Source

It is of great importance for power grids to have black-start capability for rapid recovery, and there is great theoretical significance and practical application value in studying how to use wind farms as the black-start power supply source for power grids with large-scale renewable energy generation. In this paper, a black-start scheme using a permanent-magnet synchronous generator (PMSG)-based wind farm as black-start power supply source is formulated. First, a diesel generator is used as an external supporting power supply for the self-start of a wind power unit (WPU). Then, after all the planned WPUs operate normally, the wind farm with the diesel generator and static var generator (SVG) is used to black start the simulated auxiliary load of a thermal power plant. A field test of the proposed black-start scheme is carried out on an actual wind farm in Jiangsu Province (China). The results of the field test show that wind farms can act as a black-start power supply source for the grid after appropriate technological transformation.

scholarly journals Optimization Method for Operation Schedule of Microgrids Considering Uncertainty in Available Data

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2487
Author(s):  
Hirotaka Takano ◽  
Ryota Goto ◽  
Ryosuke Hayashi ◽  
Hiroshi Asano
Keyword(s):  
Objective Function ◽  
Electric Power ◽  
Power Supply ◽  
Solution Method ◽  
Optimization Problems ◽  
Supply And Demand ◽  
Optimal Operation ◽  
Power Grids ◽  
Electric Power Supply ◽  
Operation Schedule

Operation scheduling in electric power grids is one of the most practical optimization problems as it sets a target for the efficient management of the electric power supply and demand. Advancement of a method to solve this issue is crucially required, especially in microgrids. This is because the operational capability of microgrids is generally lower than that of conventional bulk power grids, and therefore, it is extremely important to develop an appropriate, coordinated operation schedule of the microgrid components. Although various techniques have been developed to solve the problem, there is no established solution. The authors propose a problem framework and a solution method that finds the optimal operation schedule of the microgrid components considering the uncertainty in the available data. In the authors’ proposal, the objective function of the target problem is formulated as the expected cost of the microgrid’s operations. Since the risk of imbalance in the power supply and demand is evaluated as a part of the objective function, the necessary operational reserve power is automatically calculated. The usefulness of the proposed problem framework and its solution method was verified through numerical simulations and the results are discussed.

Overview on Micro-Grid Technology Research

2013 ◽  
Vol 749 ◽  
pp. 618-621 ◽  
Author(s):  
You Jie Ma ◽  
Kun Zhou ◽  
Xue Song Zhou
Keyword(s):  
Power Generation ◽  
Distributed Generation ◽  
Power Supply ◽  
Large Scale ◽  
Grid Technology ◽  
Technology Research ◽  
Generation System ◽  
New Energy ◽  
Power Generation System ◽  
Micro Grid

Traditional central power supply and distributed generation have the advantages and limitations themselves. Micro grid technology can integrate the advantages of distributed generation and that makes for large scale new energy and renewable energy power generation system connected to the grid. First, the micro grid research background and significance are introduced in detail, then the current research situations of micro-grid at home and abroad are represented, in the end, the key problems and development prospect of micro grid are discussed emphatically.

A Study on the Impact of Microgrid Stability Containing Distributed Power

2013 ◽  
Vol 313-314 ◽  
pp. 865-869 ◽  
Author(s):  
Yi Zhao ◽  
Li Liu ◽  
Wen Yao Sun
Keyword(s):  
Transient Stability ◽  
General Rule ◽  
Power Grids ◽  
Control Mode ◽  
Large Power ◽  
Distributed Power ◽  
General Rules ◽  
Micro Grid ◽  
The Stability ◽  
The Impact

The grid is one of the most important ways of distributed power generation.Micro-grid existence provides a new approach to solve the contradiction between the large power grids and distributed power.This paper studies the stability of Micro-grid contained DG. It establishes the simulation model of typical Micro-grid and studied the impact of transient stability in micro-grid by different fault types and different fault points. Look for the general rules of Micro-grid stability impact by different control mode and different disturbance. Dynamic response curve of Voltage and frequency in micro-grid is reached .Analysis of simulation results, this paper gets the general rule on the effect of stability of Micro-grid.

High Reliability Micro-Grid for a Nuclear Facility Emergency Power Supply

2018 ◽  
Author(s):  
Gerard R. Lekhema ◽  
Willem A. Cronje ◽  
Ian Korir
Keyword(s):  
Power Supply ◽  
Large Scale ◽  
High Reliability ◽  
Electrical Power ◽  
Research Work ◽  
Energy Sources ◽  
Nuclear Facility ◽  
Nuclear Facilities ◽  
Emergency Power ◽  
Micro Grid

This paper investigates the use of a high reliability micro-grid to supply emergency electrical power to a nuclear facility following loss of offsite power accident. Majority of the nuclear facilities around the world utilize diesel generators and battery banks as emergency power to back up the grid power supply. This power supply configuration represents the concept of the micro-grid system. The research work proposes reliability improvement of the emergency power supply by introducing distributed energy sources and large-scale energy storage systems. The proposed system was modelled with reliability block diagrams and analysed with Monte Carlo simulation to evaluate the system’s reliability in terms of loss of power supply probability (LPSP). The analysis takes into consideration, the failure probability of the components combined with the power unavailability due to the intermittent energy sources. The results show that the proposed system reduces the LPSP.

scholarly journals CLASSIFICATION OF POWER NETWORK ELEMENTS ON RELIABILITY-RELATED ASPECTS IN THE ASTRAKHAN REGION (ON THE EXAMPLE OF “ASTRAKHANENERGO” - A BRANCH OF PJSC “IDNC OF THE SOUTH”)

2019 ◽  
pp. 48-56
Author(s):  
Aislu Muratovna Kubenova ◽  
Sergey Vladimirovich Golovko
Keyword(s):  
Power Supply ◽  
Large Scale ◽  
Network Reliability ◽  
Electric Energy ◽  
Poor Quality ◽  
Power Grids ◽  
Electrical Network ◽  
The South ◽  
Electric Networks ◽  
Voltage Loss

Distribution electric networks are an important link in the system of production, transmission and consumption of electric energy. The precise configuration and setting up the relay protection and emergency automation devices, including the right choice of the device working parameters, are of great importance for the reliable operation of power grids. Problems with power supply may appear either as poor quality of electricity supply (instability or distortion of voltage, its frequency fluctuation, low capacity of the power grid), or as its unreliability voltage loss. Recently, in the Astrakhan region there has been recorded an increase of electrical loads due to the growing number of enterprises and energy supply building in industry and household. The search for variants with reduced capital investments in the process of the large-scale and expensive energy construction, as well as the selection of simple and relevant proposals for the development and elaborating power supply systems are important issues for designing power lines. The analysis of the electrical network reliability factors of “Astrakhanenergo”, the branch of “IDGC of the South”, PJSC has been done.

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