scholarly journals Visions, Scenarios and Action Plans Towards Next Generation Tanzania Power System

Energies ◽  
2012 ◽  
Vol 5 (10) ◽  
pp. 3908-3927 ◽  
Author(s):  
Santos Kihwele ◽  
Kyeon Hur ◽  
Alex Kyaruzi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Grid ◽  
Green Energy ◽  
Action Plans ◽  
Next Generation ◽  
Smart Power ◽  
The Future ◽  
Aging Infrastructure ◽  
High Tariff

This paper presents strategic visions, scenarios and action plans for enhancing Tanzania Power Systems towards next generation Smart Power Grid. It first introduces the present Tanzanian power grid and the challenges ahead in terms of generation capacity, financial aspect, technical and non-technical losses, revenue loss, high tariff, aging infrastructure, environmental impact and the interconnection with the neighboring countries. Then, the current initiatives undertaken by the Tanzania government in response to the present challenges and the expected roles of smart grid in overcoming these challenges in the future with respect to the scenarios presented are discussed. The developed scenarios along with visions and recommended action plans towards the future Tanzanian power system can be exploited at all governmental levels to achieve public policy goals and help develop business opportunities by motivating domestic and international investments in modernizing the nation’s electric power infrastructure. In return, it should help build the green energy economy.

scholarly journals Evaluating the Potential Contribution of District Heating to the Flexibility of the Future Italian Power System

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 584
Author(s):  
Chiara Magni ◽  
Sylvain Quoilin ◽  
Alessia Arteconi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Large Scale ◽  
District Heating ◽  
Energy System ◽  
Heat Pumps ◽  
Electricity Sector ◽  
Potential Contribution ◽  
The Future ◽  
Promising Solution

Flexibility is crucial to enable the penetration of high shares of renewables in the power system while ensuring the security and affordability of the electricity dispatch. In this regard, heat–electricity sector coupling technologies are considered a promising solution for the integration of flexible devices such as thermal storage units and heat pumps. The deployment of these devices would also enable the decarbonization of the heating sector, responsible for around half of the energy consumption in the EU, of which 75% is currently supplied by fossil fuels. This paper investigates in which measure the diffusion of district heating (DH) coupled with thermal energy storage (TES) units can contribute to the overall system flexibility and to the provision of operating reserves for energy systems with high renewable penetration. The deployment of two different DH supply technologies, namely combined heat and power units (CHP) and large-scale heat pumps (P2HT), is modeled and compared in terms of performance. The case study analyzed is the future Italian energy system, which is simulated through the unit commitment and optimal dispatch model Dispa-SET. Results show that DH coupled with heat pumps and CHP units could enable both costs and emissions related to the heat–electricity sector to be reduced by up to 50%. DH systems also proved to be a promising solution to grant the flexibility and resilience of power systems with high shares of renewables by significantly reducing the curtailment of renewables and cost-optimally providing up to 15% of the total upward reserve requirements.

Under Frequency Load Shedding Techniques for Future Smart Power Systems

2019 ◽  
pp. 188-202
Author(s):  
H. H. Alhelou
Keyword(s):  
Power Systems ◽  
Power System ◽  
Active Power ◽  
Load Shedding ◽  
System Stability ◽  
Special Focus ◽  
Power Demand ◽  
Synchronous Generators ◽  
Smart Power ◽  
System Frequency

It is critical for today's power system to remain in a state of equilibrium under normal conditions and severe disturbances. Power imbalance between the load and the generation can severely affect system stability. Therefore, it is necessary that these imbalance conditions be addressed in the minimum time possible. It is well known that power system frequency is directly proportional to the speed of rotation of synchronous machines and is also a function of the active power demand. As a consequence, when active power demand is greater than the generation, synchronous generators tends to slow down and the frequency decreases to even below threshold if not quickly addressed. One of the most common methods of restoring frequency is the use of under frequency load shedding (UFLS) techniques. In this chapter, load shedding techniques are presented in general but with special focus on UFLS.

scholarly journals A Study on Optimal Power System Reinforcement Measures Following Renewable Energy Expansion

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5929
Author(s):  
Hyuk-Il Kwon ◽  
Yun-Sung Cho ◽  
Sang-Min Choi
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Power System ◽  
Transmission Lines ◽  
Large Scale ◽  
Supply And Demand ◽  
Electricity Supply ◽  
Static And Dynamic Analysis ◽  
The Future ◽  
Reinforcement Measures

Renewable energy generation capacity in Korea is expected to reach about 63.8 GW by 2030 based on calculations using values from a power plan survey (Korea’s renewable energy power generation project plan implemented in September 2017) and the “3020” implementation plan prescribed in the 8th Basic Plan for Long-Term Electricity Supply and Demand that was announced in 2017. In order for the electrical grid to accommodate this capacity, an appropriate power system reinforcement plan is critical. In this paper, a variety of scenarios are constructed involving renewable energy capacity, interconnection measures and reinforcement measures. Based on these scenarios, the impacts of large-scale renewable energy connections on the future power systems are analyzed and a reinforcement plan is proposed based on the system assessment results. First, the scenarios are categorized according to their renewable energy interconnection capacity and electricity supply and demand, from which a database is established. A dynamic model based on inverter-based resources is applied to the scenarios here. The transmission lines, high-voltage direct current and flexible alternating current transmission systems are reinforced to increase the stability and capabilities of the power systems considered here. Reinforcement measures are derived for each stage of renewable penetration based on static and dynamic analysis processes. As a result, when large-scale renewable energy has penetrated some areas in the future in Korean power systems, the most stable systems could be optimally configured by applying interconnection measure two and reinforcement measure two as described here. To verify the performance of the proposed methodology, in this paper, comprehensive tests are performed based on predicted large-scale power systems in 2026 and 2031. Database creation and simulation are performed semi-automatically here using Power System Simulator for Engineering (PSS/E) and Python.

scholarly journals Global Trends and Advances Towards a Smarter Grid and Smart Cities

2020 ◽  
Vol 12 (2) ◽  
pp. 37 ◽  
Author(s):  
Om P. Malik
Keyword(s):  
Power Systems ◽  
Smart Cities ◽  
Future Internet ◽  
Next Generation ◽  
Special Issue ◽  
Electric Grid ◽  
Global Trends ◽  
The Future ◽  
Emerging Issues

Taking advantage of new developing technologies, power systems are being developed into smarter grids with the vision of becoming the next-generation electric grid for smart cities. Some of the emerging issues and challenges associated with the development of technologies for smarter grids and smart cities are highlighted in this special issue of the Future Internet journal.

scholarly journals Analysis of Output Characteristics of Typical Distributed Wind Power

2019 ◽  
Vol 79 ◽  
pp. 03017
Author(s):  
Mingyu Dong ◽  
Dezhi Li ◽  
Fenkai Chen ◽  
Meiyan Wang ◽  
Rongjun Chen ◽  
...  
Keyword(s):  
Wind Power ◽  
Power Output ◽  
Power Distribution ◽  
Large Scale ◽  
Power Grid ◽  
Stable Operation ◽  
Smart Power ◽  
Power Exchange ◽  
The Future ◽  
Output Characteristics

With the development of smart power distribution technology in the future, a large range of power supply load (such as distributed wind power generation) will appear on the power receiving end. When distributed wind power is connected to the power grid on a large scale, it will have a certain impact on the safe and stable operation of the power grid. However, if the wind power output characteristics can be analyzed and the wind power output is properly regulated, the one-way flow of power from the distribution network to the user side will be broken, so that the future "network-load" has dual interaction characteristics based on response and substantial power exchange.

Renewable energy development in Southeast Asia

2019 ◽  
Vol 1 (2) ◽  
pp. 52-62
Author(s):  
Yu. V. Vasil’ev ◽  
I. L. Ozernykh
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Southeast Asia ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Photovoltaic Energy ◽  
The Future ◽  
Specialized Equipment ◽  
High Level ◽  
Virtual Synchronous Machine

Subject of study: renewable energy, including photovoltaic energy. Goals: to present the main topics of the ACEPT conference, also formulated the topical issues of renewable energy and methods for their solution.Introduction: from October 31 to November 2, 2018, a conference on topical issues of green energy in Southeast Asia was held in Singapore. This event was viewed as part of the Singapore Energy Week. During the event, a dialogue was held between the leaders of regional renewable energy, equipment manufacturers, developers, businessmen, and civil servants in order to work out strategies for the development of green energy, which was supposed to solve the main modern problems of renewable energy in general and photovoltaic energy in particular. It was determined that the main problem of the new energy sector is to overcome the technological barrier to the integration of hybrid microenergy systems as cells of the smart grid of the future. Much attention was paid to the problem of energy storage in modern energy as a means of improving the flexibility and sustainability of the Microgrid in combination with renewable energy sources. The issues discussed were followed by the formation of new solutions to the problems posed.Methods: this chapter contains the main developed and actively developing technologies for creating specialized equipment that will significantly simplify the design and increase speed. The key task in this direction is the development of the Virtual Synchronous Machine (VSM), which has a high level of controllability and dynamic stability. The article presents the main schemes of operation of this equipment.Results and discussions: in the future, it is assumed that electric power systems will consist of a multitude of microsystems interconnected by backup links. This chapter contains current methods of promoting new solutions to the markets. Conclusion: based on the work carried out, the main conclusions were formulated.

scholarly journals Operational Reliability Assessment of an Interconnected Power System Based on an Online Updating External Network Equivalent Model with Boundary PMU

Electronics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 49 ◽  
Author(s):  
Dabo Zhang ◽  
Shuai Lian ◽  
Weiqing Tao ◽  
Jinsong Liu ◽  
Chen Fang
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Grid ◽  
Measurement Data ◽  
Operational Reliability ◽  
Equivalent Model ◽  
Interconnected Power System ◽  
Network Information ◽  
Interconnected Power Systems ◽  
Internal Network

Information between interconnected power systems is difficult to share in real time, due to trade secrets and technical limitations. The regional power grid cannot timely detect the impact of changes in the operation mode of the external power grid on the regional reliability, due to faults, load fluctuations, power generation plan adjustments, and other reasons. How to evaluate the reliability of a regional power system under the conditions of information isolation is a difficult problem for the security of interconnected power systems. Aiming at this problem, an operational reliability evaluation method for an interconnected power system is proposed herein, which does not depend on external network information directly, but only uses boundary phasor measurement unit (PMU) measurement data and internal network information. A static equivalent model with sensitivity consistency was used to simplify the external network to ensure the accuracy of the reliability calculation of interconnected power systems. The boundary PMU measurement data were used to update the external network equivalent model online. The algorithm flow of the operation reliability assessment for the interconnected power grid is given. The results of an example based on the IEEE-RTS-96 test system show that the proposed method can track the equivalent parameters of the external network without depending on the actual topological information, and calculate the reliability index of the internal network accurately.

Smart Grid in China: A Review

2013 ◽  
Vol 732-733 ◽  
pp. 1365-1369 ◽  
Author(s):  
Jia Kun Shen ◽  
Chang Hong Zhao ◽  
Jia Hai Yuan
Keyword(s):  
Economic Development ◽  
Smart Grid ◽  
Power System ◽  
Power Grid ◽  
The World ◽  
The Future

With the acceleration of economic development, the development of the power system is facing greater challenges to meet this challenge, the concept of smart grid is able to generate. This article provides an overview about the motivation for developing smart grid of the major countries in the world. Then it provides a review about the development and the relevant policies about smart grid in China. It also described the planning and roadmaps by Power Grid Companies, analyzed the problems of domestic smart grid development briefly and gave recommendations about what should be focused on in the future.

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