Modeling, analysis, and validation of a preliminary design for a 20 kV medium voltage DC substation

Reed, Gregory F.; Grainger, Brandon M.; Korytowski, Matthew J.; Taylor, Emmanuel

doi:10.1109/energytech.2011.5948526

Cited by 8 publications

(12 citation statements)

References 8 publications

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“…This same study performed on a DC load would yield a much better result for NaS battery storage because it increases the efficiency a great deal. Currently solutions using battery storage tied to a DC grid are being developed [39,40].…”

Section: Resultsmentioning

confidence: 99%

Economic analysis of grid level energy storage for the application of load leveling

Kerestes

Reed

Sparacino

2012

2012 IEEE Power and Energy Society General Meeting

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ivThe benefits that exist on behalf of energy storage appear to be nearly limitless and there is no exception to this in power systems. Energy storage can be used to flatten an electrical load by charging the storage when the system load is low and discharging the storage when the system load is high. This technique is known as load leveling and is the storage application of interest in this thesis.One of the biggest benefits that load leveling can yield is the elimination of expensive gas turbine generators. Gas turbine generators are used because they can react to drastic changes in the system load that other generators can't. Their downfall however, is that they are more expensive than the other generators. But if the load is level enough, there is no need to use gas turbine generators because there aren't any drastic changes in the load.Load leveling requires a storage device to have a very large capacity. In this thesis several different large storage types are studied to see which ones are best suited for the application of load leveling. Ultimately both NaS batteries and pumped hydro storage are chosen to use for this study and the results for each is compared.A theoretical double peak system load with a peak value of 1950 megawatts is used for this study. The load is leveled by discretizing the energy storage's charging and discharging profiles and allocating the stored energy by means of dynamic programming. An economic analysis of both the original case and the case in which energy storage is used to level the load is carried out.

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Section: Resultsmentioning

confidence: 99%

Economic analysis of grid level energy storage for the application of load leveling

Kerestes

Reed

Sparacino

2012

2012 IEEE Power and Energy Society General Meeting

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“…Fig. 2 [1], a model was developed that served as an initial benchmark used for exploring some of the latter details. An illustration of that model is presented in Fig.…”

Section: Medium Voltage DC Network Model Developmentmentioning

confidence: 99%

“…2 includes two multilevel DC-to-AC inverters, a six pulse AC-to-DC rectifier, two induction machines, a bidirectional DC-to-DC converter, and the intermittent renewable generation resource being wind. This model uses open loop control except within the wind turbine model, explained in [1], that regulates the blade pitch which adjusts the mechanical torque supplied to the induction machine. The research group has added many layers of sophistication to the model of Fig.…”

Section: Medium Voltage DC Network Model Developmentmentioning

confidence: 99%

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Advancements in medium voltage DC architecture development with applications for powering electric vehicle charging stations

Reed

Grainger

Sparacino

et al. 2012

2012 IEEE Energytech

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MVDC infrastructure serves as a platform for interconnecting many forms of renewable electric power generation, including wind and solar. Forthcoming abundant loads such as industrial facilities, data centers, and electric vehicle charging stations can be powered using MVDC technology. MVDC networks are expected to improve efficiency by serving as an additional layer between the transmission and distribution level voltages for which renewable resources could directly connect with smaller rated power conversion equipment. This work establishes a 5 kV MVDC architecture composed of 4, type 4 wind turbines (full converter) capable of supplying 20 MW and a photovoltaic plant supplying 1 MW of power. The load emphasized in this article is an electric vehicle charging station. Details of the modeling approach are presented as well as validated simulation results performed in PSCAD of the overall MVDC structure.

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“…DC voltage was difficult to be changed in the past. However, the progress in the power electronic area has made DC voltage transformation [2] much easier and more effective. Moreover, the adoption of DC loads [3] (e.g., electric vehicles, data centers) and DC based sources (e.g., photovoltaic systems, fuel cells) has increased greatly in recent years [4,5].…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Scheduling for a Medium Voltage AC/DC Hybrid Distribution Network

et al. 2018

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Abstract:With the great increase of renewable generation as well as the DC loads in the distribution network; DC distribution technology is receiving more attention; since the DC distribution network can improve operating efficiency and power quality by reducing the energy conversion stages. This paper presents a new architecture for the medium voltage AC/DC hybrid distribution network; where the AC and DC subgrids are looped by normally closed AC soft open point (ACSOP) and DC soft open point (DCSOP); respectively. The proposed AC/DC hybrid distribution systems contain renewable generation (i.e., wind power and photovoltaic (PV) generation); energy storage systems (ESSs); soft open points (SOPs); and both AC and DC flexible demands. An energy management strategy for the hybrid system is presented based on the dynamic optimal power flow (DOPF) method. The main objective of the proposed power scheduling strategy is to minimize the operating cost and reduce the curtailment of renewable generation while meeting operational and technical constraints. The proposed approach is verified in five scenarios. The five scenarios are classified as pure AC system; hybrid AC/DC system; hybrid system with interlinking converter; hybrid system with DC flexible demand; and hybrid system with SOPs. Results show that the proposed scheduling method can successfully dispatch the controllable elements; and that the presented architecture for the AC/DC hybrid distribution system is beneficial for reducing operating cost and renewable generation curtailment.

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Modeling, analysis, and validation of a preliminary design for a 20 kV medium voltage DC substation

Cited by 8 publications

References 8 publications

Economic analysis of grid level energy storage for the application of load leveling

Economic analysis of grid level energy storage for the application of load leveling

Advancements in medium voltage DC architecture development with applications for powering electric vehicle charging stations

Optimal Power Scheduling for a Medium Voltage AC/DC Hybrid Distribution Network

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