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A new concept of solid state transformer based microgrid system is presented in this paper. By utilizing 400 V DC bus generated from Gen-I solid state transformer proposed by FREEDM systems center, integration issues of DC microgrid and solid state transformer are analyzed. Zonal DC microgrid concept is applied to this novel system with the consideration of burden minimization to the existing AC grid...
This paper presents the design and hardware implementation and testing of 20kVA Gen-1 silicon based solid state transformer (SST), the high input voltage and high voltage isolation requirement are two major concerns for the SST design. So a 6.5kV 25A dual IGBT module has been customized packaged specially for this high voltage low current application, and an optically coupled high voltage sensor and...
The FREEDM grid utilizes solid state transformers (SST) and solid state fault interruption devices (FID) which may lead to unfavorable operating losses as compared to a conventional grid. Various SST topologies and switching techniques are identified for minimizing losses and a performance evaluation is made to determine the efficiency of the FREEDM distribution network to improve the overall efficiency...
This paper addresses the timely issues of modeling of, and defining selection criteria for, a solid state fault isolation device (FID) to be used in power electronic based distribution systems (PEDS). Circuit interruption requirements and FID location in power electronics based distribution system are discussed in this paper. The paper subsequently derives the FID parameters by mapping the characteristics...
The Solid State Transformer (SST) is one of the key elements proposed in the National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ??Future Renewable Electric Energy Delivery and Management?? (FREEDM) Systems Center. The SST is used to enable active management of distributed renewable energy resources, energy storage devices and loads. In this paper, the Generation-I SST...
The solid state transformer (SST) is one of the key elements proposed in the National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ldquoFuture Renewable Electric Energy Delivery and Managementrdquo (FREEDM) Systems Center established in 2008. The SST is used to enable active management of distributed renewable energy resources, energy storage devices and loads. In this...
Static synchronous compensator (STATCOM) is a static compensator used to regulate voltage by reactive power injection, and to improve dynamic stability of power system. In this paper, the STATCOM control and operation for a 48-pulse VSC topology implemented with series connected transformers is reported. Two different control modes - voltage control and VAR control - for the STATCOM are investigated...
The STATCOM (Synchronous Static Compensator) based on voltage source converter (VSC) is used to supply dynamic VARs required during power system faults for voltage support. However, magnetic saturation of transformers used in VSC topology result in over-current and trips of the STATCOM during system faults, when dynamic VARs and voltage support are required the most. In this paper, we propose and...
A 200 MVA, 345 kV system control FACTS device, consisting of two 100 MVA converters, two 100 MVA high voltage series transformers inserted in 345 kV transmission lines and a 200 MVA shunt transformer, was tested and utilized on a 345 kV network. This device, namely convertible static compensator (CSC), has four basic configurations: static synchronous compensator (STATCOM), static synchronous series...
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