Integrated Energy System (IES), which plays a vital role in the development of Energy Internet (EI), can improve the efficiency of energy utilization and integration of renewable energy. However, the coupling between ...
ISBN:
(数字)9781839530043
Integrated Energy System (IES), which plays a vital role in the development of Energy Internet (EI), can improve the efficiency of energy utilization and integration of renewable energy. However, the coupling between multiple energy systems will bring new challenges to the security control of the IES, such as combined heat and power (CHP) system. For IES, the preventive control is the first line of defense to ensure that the system can keep stable operation when contingencies such as the transmission outage or generator outage happen. This paper proposes a preventive control approach for CHP system, in which a day-ahead security constrained economic dispatch (SCED) model of CHP system considering the coupling of heat and electric is formulated. The model aims to minimize the cost of the whole system, while the preventive control of the system can be achieved with the constraints considering the normal states and contingencies states. Case studies based on the IEEE 9-bus system with CHPs are presented to illustrate the approach. The case result shows that the combined electric and heat optimal dispatch is more economical than when two systems are independently optimized and operated. And the proposed preventive control approach of the CHP system can satisfy both the electric and heat demand, and system security is ensured when the N-1 contingencies happened.
power electronic zigzag transformer is an attractive solution for the flexible interconnection of smart distribution *** is constituted by slow-response and low-precision thyristor converters and fast-response and hig...
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power electronic zigzag transformer is an attractive solution for the flexible interconnection of smart distribution *** is constituted by slow-response and low-precision thyristor converters and fast-response and high-accuracy voltage source *** paper models its primary circuit and addresses its basic operation *** a dual-timescale control scheme is investigated to realize the coordinated regulation of both types of converter.A simulation case is established in PSCAD containing interconnected mid-voltage distribution *** with poor-and well-matched control timescales are both carried *** accordingly,the power flow controllability under these conditions is *** the shorter control timescale is no more than tenth of the longer one,the power electronic zigzag transformer will operate with satisfying performances.
Modifying the equivalent rotor resistivity with rotor end factor in 2-dimension(2-D)finite element analysis(FEA)is an effective way to analyze the 3-dimension(3-D)solid rotor *** the smooth solid rotor,five different ...
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Modifying the equivalent rotor resistivity with rotor end factor in 2-dimension(2-D)finite element analysis(FEA)is an effective way to analyze the 3-dimension(3-D)solid rotor *** the smooth solid rotor,five different rotor end factors are discussed and compared with each *** is theoretically clarified that the resistivity of rotor in 2-D FEA should be multiplied by the square of rotor end factors to take the 3-D end effect of solid rotor into *** the slitted solid rotor,an improved rotor end factor is proposed based on the equivalent area algorithm of eddy currents in rotor,since the end factors of smooth solid rotor are not ***,the time-harmonic finite element method(FEM)combined with the rotor end factor is applied to analyze the performance of solid rotor induction *** tested and computed results are in good agreement,which proves the effectiveness of rotor end factor for the simplication of 3-D solid rotor problems.
The prediction method based on the partition of weather types has been widely used in photovoltaic prediction. Here, the temporal characteristics of PV data is studied, the physical meaning of the sequential differenc...
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Wind-photovoltaic-energy storage (ES) hybrid generating system has numerous reactive power sources. It is crucially important for coordinated control of these reactive power sources. According to the test results, the...
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A flashover switch inserted between the cathode and wire end was used to enhance the deposition energy into an exploding wire in *** was found that the flashover switch plays two roles:the first one is reducing the ri...
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A flashover switch inserted between the cathode and wire end was used to enhance the deposition energy into an exploding wire in *** was found that the flashover switch plays two roles:the first one is reducing the rise time of the current pulse,the second and more important one to greatly improve the surface radial electric field and suppress the electronic emission that is responsible for triggering the surface breakdown of the exploding *** the second one takes effect and results in much higher energy deposition only with the flashover switch on the *** this case,the deposition energy was increased by ~three times(3.4eV/atom vs.12eV/atom) under negative current pulse and by ~two times(5.7eV/atom vs.13eV/atom) under a positive one,and fully vaporized wire core was observed with laser interferometry.
The future power system will be the integra-tion of multiple energy systems, cyber-physical system, and multiple markets. This paper presents an architecture of energy-discretized multi-energy microgrids. This archite...
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ISBN:
(纸本)9781538614280
The future power system will be the integra-tion of multiple energy systems, cyber-physical system, and multiple markets. This paper presents an architecture of energy-discretized multi-energy microgrids. This architecture can achieve the point-to-point (P2P)transmission of discrete energy with the physical system level, which solves the problem of energy flow tracking and measurement. In this architecture, the real-time transaction-and-control-combined mechanism can ensure the dynamic and fully customized energy supply. This paper draws the architecture of a new generation of energy supply system, and may provide an idea for the integration of energy, information, and value in energy supply system.
With the increase of distributed energy resources (DER), energy network's uncertainty is growing continuously, and grid operations is encountering severe challenges. Conventionally, the N-1 security criteria is sa...
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With the increase of distributed energy resources (DER), energy network's uncertainty is growing continuously, and grid operations is encountering severe challenges. Conventionally, the N-1 security criteria is satisfied mainly via adjusting generators' output. But in some cases, it is not effective because of the complex network constraints and the generators' limited dispatch range. With the development of smart buildings, there are lots of thermostatic controlled loads inside the buildings. The flexibility of building energy consumption is underutilized in the past. Therefore, a new method is proposed in this paper to enhance N-1 security via building thermostatic load control. A three-stage model is formulated. An energy-consumption simulation software termed EnergyPlus is utilized to calculate the relationship between indoor temperature settings and thermostatic loads of buildings. Case studies based on the modified IEEE-30 bus system with building thermostatic load validate the effectiveness of the proposed control method.
Insufficient power capacity for peak load regulation has caused loss of wind power accommodation in China.A regulation capacity market is under consideration to encourage more peak regulation service,thus how much the...
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Insufficient power capacity for peak load regulation has caused loss of wind power accommodation in China.A regulation capacity market is under consideration to encourage more peak regulation service,thus how much the market would be is important for each participant.A new peak-load regulation capacity planning method is proposed for long-term market based on the wind power curtailment evaluation model using probabilistic production *** method is suitable for the situation in the planning stage without the knowledge of detailed sequences of load and renewable power,and includes modeling of two peak load regulation measures,increasing the adjustable capacity and to shift some long-lasting units to on/off cycling units.A typical area in China is studied in the paper to evaluate the actual effects of different measures.
The unavoidable wind power forecast error results in the pervasive uncertainty in power system economic *** order to solve optimization problem such as economic dispatch with random variables,the commonest and simples...
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The unavoidable wind power forecast error results in the pervasive uncertainty in power system economic *** order to solve optimization problem such as economic dispatch with random variables,the commonest and simplest method is using a deterministic value to replace this random *** kinds of predictions are used such as maximumlikelihood approximation,expectation and *** study analyses the effect of these prediction choices on uncertainty of power system via comparing their statistical *** is shown that when the wind power output is very volatile,the quality of these prediction choices is not ***,a simplified three-unit thermal system and a tenunit system are studied for illustrating the consequence of statistical inconsistency.
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