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Determination of Effective Load Shedding Schemes in Electric Power Plants 被引量:1
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作者 Godwin Effiong Priye Kenneth Ainah Jackson Karniliyus 《Energy and Power Engineering》 2020年第10期555-567,共13页
The ability of power system to survive the transition from preloading state to the gradual increase in load and thereafter reach an acceptable operational condition is an indication of transient stability of the syste... The ability of power system to survive the transition from preloading state to the gradual increase in load and thereafter reach an acceptable operational condition is an indication of transient stability of the system. The study analyzed load shedding scheme through the use of empirical measurement tools and load-flow simulation techniques. It was geared towards determining effective load shedding strategies to reduce unnecessary overload in order to achieve dynamic stability of the electric power network in the Export Free Trade Zone, Calabar, Nigeria. From the tests and the measurements taken, it was observed that the real and reactive powers from the generator and the mechanical power from the turbine engine were stable when the load shedding controller was switched on, as compared to when it was off. The engine speed, the bus-bar frequency and the output voltage of the generator stabilized within a shorter time (about 8 seconds) when the controller was switched on than when it was on the off condition. Also, there were noticeable fluctuations in the speed of the remaining two generators. It became stable at about 12 seconds after the loss. The variations were 0.3 per cent of the nominal speed value. The excitation voltage fluctuated from 1.2 (pu) to 4.5 (pu) when the bus voltage dipped as a result of additional load. It then came down and stabilized at 1.8 (pu) after few swings. This confirmed that the stability of power system is much enhanced when load shedding controllers are effectively configured on the network. 展开更多
关键词 power System Transient Stability Load Shedding Scheme electric power network
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Global Harmonic Rate Assessment in the Electricity Distribution Network in Niamey City:Case Studies of Domestic,Industrial and Hospital Substations 被引量:1
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作者 Abdourahimoun Daouda Saidou Madougou Abdoul Aziz Ibrahim 《Energy and Power Engineering》 2017年第12期786-801,共16页
Like others countries of the world, in Niger also, we are witnessing an increasing use of non-linear electric loads in the domestic, hospital and industrial sectors. However, these loads degrade the shape of the elect... Like others countries of the world, in Niger also, we are witnessing an increasing use of non-linear electric loads in the domestic, hospital and industrial sectors. However, these loads degrade the shape of the electrical signal and cause disastrous effects to the equipment of the distribution system and the devices which are connected to the network. This article highlights the presence of electric harmonics in the distribution network in Niamey city. In order to do this, measurements were taken at the secondary level of the substations using an energy quality analyze r (FLUKE 1735). By using this measuring instrument, we quantified the voltage and current Total Harmonic Distortion (THD) in the three substations. The results obtained show that, although the statutable rates set by the standards are not exceeded for phase conductors, the neutral contains a very critical percentage of distortion on the residential and hospital substations. Moreover, this assessment made it possible to observe the variation of harmonics in the presence of voltage drops. 展开更多
关键词 electric power Distribution network Harmonic Disturbance Total Harmonic Distortion(THD) power Quality Distribution network
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A Vehicle Routing Problem Based on Intelligent Batteries Transfer Management for the EV Network 被引量:2
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作者 XIA Yamei CHENG Bo 《China Communications》 SCIE CSCD 2014年第5期160-169,共10页
Batteries transfer management is one important aspect in electric vehicle(EV)network's intelligent operation management system.Batteries transfer is a special and much more complex VRP(Vehicle Routing Problem) whi... Batteries transfer management is one important aspect in electric vehicle(EV)network's intelligent operation management system.Batteries transfer is a special and much more complex VRP(Vehicle Routing Problem) which takes the multiple constraints such as dynamic multi-depots,time windows,simultaneous pickups and deliveries,distance minimization,etc.into account.We call it VRPEVB(VRP with EV Batteries).This paper,based on the intelligent management model of EV's battery power,puts forward a battery transfer algorithm for the EV network which considers the traffic congestion that changes dynamically and uses improved Ant Colony Optimization.By setting a reasonable tabv range,special update rules of the pheromone and path list memory functions,the algorithm can have a better convergence,and its feasibility is proved by the experiment in an EV's demonstration operation system. 展开更多
关键词 VRP battery power management ant colony algorithm electric vehicle network
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Improved Approximate Minimum Degree Ordering Method and Its Application for Electrical Power Network Analysis and Computation 被引量:1
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作者 Jian Guo Hong Liang +3 位作者 Songpu Ai Chao Lu Haochen Hua Junwei Cao 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2021年第4期464-474,共11页
Electrical power network analysis and computation play an important role in the planning and operation of the power grid,and they are modeled mathematically as differential equations and network algebraic equations.Th... Electrical power network analysis and computation play an important role in the planning and operation of the power grid,and they are modeled mathematically as differential equations and network algebraic equations.The direct method based on Gaussian elimination theory can obtain analytical results.Two factors affect computing efficiency:the number of nonzero element fillings and the length of elimination tree.This article constructs mapping correspondence between eliminated tree nodes and quotient graph nodes through graph and quotient graph theories.The Approximate Minimum Degree(AMD)of quotient graph nodes and the length of the elimination tree nodes are composed to build an Approximate Minimum Degree and Minimum Length(AMDML)model.The quotient graph node with the minimum degree,which is also the minimum length of elimination tree node,is selected as the next ordering vector.Compared with AMD ordering method and other common methods,the proposed method further reduces the length of elimination tree without increasing the number of nonzero fillings;the length was decreased by about 10%compared with the AMD method.A testbed for experiment was built.The efficiency of the proposed method was evaluated based on different sizes of coefficient matrices of power flow cases. 展开更多
关键词 Approximate Minimum Degree and Minimum Length(AMDML) electrical power network analysis elimination tree numerical solution ordering method
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Reliability Assessment of Integrated Electricity and Natural Gas Transmission Systems in Presence of Power-to-gas and Combined Heat and Power Technologies
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作者 Alireza Tabebordbar Mohammad Rastegar 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第3期1193-1202,共10页
Assessing the reliability of integrated electricity and gas systems has become an important issue due to the strong dependence of these energy networks through the power-to-gas(P2G)and combined heat and power(CHP)tech... Assessing the reliability of integrated electricity and gas systems has become an important issue due to the strong dependence of these energy networks through the power-to-gas(P2G)and combined heat and power(CHP)technologies.The current work,initially,presents a detailed energy flow model for the integrated power and natural gas system in light of the P2G and CHP technologies.Considering the simultaneous load flow of networks,a contingency analysis procedure is proposed,and reliability is assessed through sequential Monte Carlo simulations.The current study examines the effect of independent and dependent operation of energy networks on the reliability of the systems.In particular,the effect of employing both P2G and CHP technologies on reliability criteria is evaluated.In addition,a series of sensitivity analysis are performed on the size and site of these technologies to investigate their effects on system reliability.The proposed method is implemented on an integrated IEEE 24-bus electrical power system and 20-node Belgian natural gas system.The simulation procedure certifies the proposed method for reliability assessment is practical and applicable.In addition,the results prove connection between energy networks through P2G and CHP technologies can improve reliability of networks if the site and size of technologies are properly determined. 展开更多
关键词 CHP technology P2G technology integrated electrical power and natural gas network reliability assessment sequential Monte Carlo simulation method
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Fast Distributed Demand Response Algorithm in Smart Grid 被引量:2
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作者 Qifen Dong Li Yu +3 位作者 Wenzhan Song Junjie Yang Yuan Wu Jun Qi 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2017年第2期280-296,共17页
This paper proposes a fast distributed demand response U+0028 DR U+0029 algorithm for future smart grid based on primaldual interior method and Gaussian belief propagation U+0028 GaBP U+0029 solver. At the beginning o... This paper proposes a fast distributed demand response U+0028 DR U+0029 algorithm for future smart grid based on primaldual interior method and Gaussian belief propagation U+0028 GaBP U+0029 solver. At the beginning of each time slot, each end-user U+002F energysupplier exchanges limited rounds of messages that are not private with its neighbors, and computes the amount of energy consumption U+002F generation locally. The proposed demand response algorithm converges rapidly to a consumption U+002F generation decision that yields the optimal social welfare when the demands of endusers are low. When the demands are high, each end-user U+002F energysupplier estimates its energy consumption U+002F generation quickly such that a sub-optimal social welfare is achieved and the power system is ensured to operate within its capacity constraints. The impact of distributed computation errors on the proposed algorithm is analyzed theoretically. The simulation results show a good performance of the proposed algorithm. © 2017 Chinese Association of Automation. 展开更多
关键词 electric power transmission networks Energy utilization
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Distributed schemes for efficient deployment of price-responsive demand with partial flexibility 被引量:2
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作者 A.De Paola D.Angeli G.Strbac 《Journal of Control and Decision》 EI 2018年第2期169-194,共26页
This paper presents novel methodologies for efficient deployment of flexible demand.Large populations of price-responsive loads are coordinated through a price signal and a power constraint broadcast by a central enti... This paper presents novel methodologies for efficient deployment of flexible demand.Large populations of price-responsive loads are coordinated through a price signal and a power constraint broadcast by a central entity.Such quantities are designed in order to minimise a global objective function(e.g.total generation costs)and ensure a one-step convergence to a stable solution,characterised as a Nash equilibrium.Conditions for the sought equilibrium are preliminarily expressed as monotonicity of demand profiles under reordered coordinates and then they are imposed as constraints of a global optimisation,whose solution is calculated numerically.To reduce the computational complexity of the problem in scenarios with high penetration of flexible demand,clustering of the appliances is introduced.The global properties of the final stable solution and its optimality with respect to the task times of the appliances are analysed both theoretically and through simulation results. 展开更多
关键词 electric power network demand response game theory distributed control
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