DC power systems: Challenges and opportunities

Saeedifard, Maryam; Graovac, M.; Dias, Robson F. S.; Iravani, Reza

doi:10.1109/pes.2010.5589736

Cited by 140 publications

(63 citation statements)

References 35 publications

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“…There are few major hurdles such as large scale employment, regularization, and safety for DC systems which still need to be worked on in order to be accepted International Journal of Photoenergy in market [20]. Future PV systems connected to low-voltage DC grids are expected to be more effective in performance and support the entire grid [21].…”

Section: Microgridmentioning

confidence: 99%

Application of DC-AC Hybrid Grid and Solar Photovoltaic Generation with Battery Storage Using Smart Grid

Rauf

Khan

2017

International Journal of Photoenergy

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Smart grid for the past few years has been the prime focus of research in power systems. The aim is to eliminate load shedding and problematic blackout conditions, further offering cheap and continuous supply of electricity for both large and small consumers. Another benefit is to integrate renewable energy resources with existing dump grid in more efficient and cost-effective manner. In past few years, growing demand for sustainable energy increases the consumption of solar PV. Since generation from solar PV is in DC and most of the appliances at home could be operated on DC, AC-DC hybrid distribution system with energy management system is proposed in this paper. EMS helps to shift or control the auxiliary load and compel the users to operate specific load at certain time slots. These techniques further help to manage the excessive load during peak and off peak hours. It demonstrates the practical implementation of DC-AC network with integration of solar PV and battery storage with existing infrastructure. The results show a remarkable improvement using hybrid AC-DC framework in terms of reliability and efficiency. All this functioning together enhances the overall efficiency; hence, a secure, economical, reliable, and intelligent system leads to a smart grid.

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Section: Microgridmentioning

confidence: 99%

Application of DC-AC Hybrid Grid and Solar Photovoltaic Generation with Battery Storage Using Smart Grid

Rauf

Khan

2017

International Journal of Photoenergy

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“…Electromagnetic simulation is still served as a major method for DC grid analysis [21]. The transient issues in DC grids, such as the DC controllers and IGBTs, belong to small time-scales, which can only be simulated using electromagnetic programs.…”

Section: Literature Surveymentioning

confidence: 99%

“… Stable simulation can be achieved for the subsystems connected through TLI interface using the same time-steps for all subsystems, called a single rate, H. This means that the state transfer matrix in an equation, similar to (21), has the norms less than 1;  Each subsystem is asymptotically stable, which means that the A11 and A22 in (30) have norms less than 1;  Different simulation time-steps, which are not larger than the single rate H, are used for subsystems. Fast subsystems have small time-steps and slow subsystems have relatively large time-steps.…”

Section: State Transfer Matrix For Tlimentioning

confidence: 99%

“…"The assumption of this theorem includes that:  A system is divided into subsystems;  Stable simulation can be achieved for the subsystems connected through TLI interface using the same time-steps for all subsystems, called a single rate, H. This means that the state transfer matrix in an equation, similar to (21), has the norms less than 1.  Each subsystem is asymptotically stable, which means that the A11 and A22 in (30) have norms less than 1.…”

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confidence: 99%

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Systematic evaluation for multi-rate simulation of DC grids

Qin

Liang

Zhou

et al. 2017

International Journal of Electrical Power & Energy Systems

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With wide applications of power electronic devices in modern power systems, simulation using traditional electromechanical and electromagnetic tools suffers low speed and imprecision. Multi-rate methods can enhance efficiency of simulation by decreasing the scale of systems in small time-steps. However, the existing traditional methods for multi-rate simulation suffer the problems of instability and simulation errors. These have hindered the application of multi-rate simulation in power industry. Therefore theoretical evaluation on different multi-rate simulation methods is crucial to understand the feasibility and limitation of the methods, and to contribute to overcome the drawbacks of the traditional methods. In this paper, the multi-rate simulation performance based on two traditional technologies and a Modified Thevenin Interface are evaluated to provide an overall feasibility of multi-rate algorithms in the power simulation. The Modified Thevenin Interface is proposed to overcome the drawbacks in synchronization. Three theorems are proposed and proved for theoretically analyzing the stability of the simulation methods. Error analyses of the multi-rate methods are performed to identify the relationships between errors and simulation conditions. Besides, the accuracy and efficiency performance in a practical project of VSC-MTDC shows the feasibility and necessity by using multi-rate simulation. Through the theoretical analysis, the issues of stability and accuracy of multi-rate simulation for the DC grids have been better understood, based on which an improved simulation algorithm has been proposed to overcome these issues. Long-term system dynamics of large-scale systems containing DC grids and fast transients of HVDC converters can be investigated simultaneously with high speed and sufficient accuracy. KeywordsElectromagnetic To view all the submission files, including those not included in the PDF, click on the manuscript title on your EVISE Homepage, then click 'Download zip file'. Journal of Advanced Research Cover Letter Manuscript title:Systematic Evaluation for Multi-Rate Simulation of DC Grids Short running title:Evaluation for Multi-Rate Simulation What does the current manuscript add to the existing knowledge? (Research Highlights)1-Three theorems for the stability of three typical multi-rate simulation algorithms have been proposed and proved.2-The error of three typical multi-rate simulation algorithms has been modelled. 3-The backward synchronization for the Thevenin equivalent interface has beenproposed to overcome the challenge of synchronization.4-Three typical multi-rate simulation algorithms have been compared to illustrate that the modified Thevenin equivalent interface is the most stable and accurate.5-The multi-rate simulation algorithm has been used in the studies of DC grids, which achieve the great improvement of the simulation speed.We affirm that the submission represents original work that has not been published previously and is not currently being considered or submitted...

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“…Lately, significant industrial and research studies in the topic of multi-terminal dc (MTDC) grid have been conducted all over the world [1]. From 1950 to 2015, around 180 two-terminal high voltage direct current (HVDC) transmission lines have been put into operation around the world.…”

Section: Introductionmentioning

confidence: 99%

Multi‐terminal HVDC grids with inertia mimicry capability

Zhang

Rouzbehi

Luna

et al. 2016

IET Renewable Power Generation

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The high-voltage multi-terminal dc (MTDC) systems are foreseen to experience an important development in the next years. Currently, they have appeared to be a prevailing technical and economical solution for harvesting offshore wind energy. In this study, inertia mimicry capability is added to a voltage-source converter-HVDC grid-side station in an MTDC grid connected to a weak ac grid, which can have low inertia or even operate as an islanded grid. The presented inertia mimicry control is integrated in the generalised voltage droop strategy implemented at the primary level of a two-layer hierarchical control structure of the MTDC grid to provide higher flexibility, and thus controllability to the network. Besides, complete control framework from the operational point of view is developed to integrate the low-level control of the converter stations in the supervisory control centre of the MTDC grid. A scaled laboratory test results considering the international council on large electric systems (CIGRE) B4 MTDC grid demonstrate the good performance of the converter station when it is connected to a weak islanded ac grid.

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DC power systems: Challenges and opportunities

Cited by 140 publications

References 35 publications

Application of DC-AC Hybrid Grid and Solar Photovoltaic Generation with Battery Storage Using Smart Grid

Application of DC-AC Hybrid Grid and Solar Photovoltaic Generation with Battery Storage Using Smart Grid

Systematic evaluation for multi-rate simulation of DC grids

Multi‐terminal HVDC grids with inertia mimicry capability

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