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This paper deals with the development of high efficiency, compact and flexible Electrical Power System (EPS) for a Cube Satellite (CubeSat). The EPS is responsible for harnessing power from solar panels, battery charging and multi-domain voltage output regulation within the CubeSat. This work builds upon the results and learnings obtained from an EPS which uses Silicon MOSFETs. The hardware and software...
The development of the high voltage wideband gap semiconductor SiC power devices has enabled the solid state transformer (SST) technology in connecting a medium voltage grid to a low voltage grid. Though, these power devices have superior loss and switching characteristics compared to Si power devices, they have limited inrush current handling capability. The large inrush currents that flow into the...
This paper summarizes the different steps that have been undertaken to design medium voltage power converters using the state-of-the-art 15 kV SiC N-IGBTs. The 11 kV switching characterization results, 11 kV high dv/dt gate driver validation, and the heat-run test results of the SiC IGBT at 10 kV, 550 W/cm2 (active area) have been recently reported as individual topics. In this paper, it is attempted...
This paper presents a modular isolated scalable three phase dual active bridge(DAB) DC-DC converter configuration using three multi limb high frequency transformers. The proposed converter has the advantage of having multiple low and high voltage dc links, which can be used at different power levels. The converter has three high voltage dc links which can be used for cascaded inverters or can be connected...
The advent of SiC devices has resulted in the development of 3-phase, Medium Voltage (MV) grid tied Solid State Transformers (SSTs). One such SST is the 100 kVA Transformerless Intelligent Power Substation (TIPS) based on 15 kV SiC IGBTs and 1200 V SiC MOSFETs which interconnects the 13.8 kV distribution grid with the 480 V utility grid. TIPS has an ac-dc-dc-ac multi-module configuration. The availability...
Due to wider band gap of silicon carbide (SiC) compared to silicon (Si), MOSFET made in SiC has considerably lower drift region resistance, which is a significant resistive component in high-voltage power devices. With low on-state resistance and its inherently low switching loss, SiC MOSFETs can offer much improved efficiency and compact size for the converter compared to those using Si devices....
Power Electronics WBG devices is key for: — Future SMART Electric Grid (Intelligent Grid / Integrated Grid) — Integration of renewables such as wind and solar with interconnections to the main grid — Reducing system losses and increasing efficiency — Reducing carbon footprint — Enhancing quality of life
A high power Y : Y/Δ three-phase Dual Active Bridge (DAB) topology offers higher power density, smaller switching stress, smaller volume of magnetics and smaller DC capacitor over single phase DAB. Therefore this topology is suitable for medium voltage (MV) applications. The high-frequency DAB currents are nearly sinusoidal suited for D-Q transformation which enables fast average mode current control...
The basic principles of UPFC operation are discussed and the series inverter dynamics are explained. Two control strategies — the Cross-Coupling method and the Advanced Control method are discussed in detail and their bode plots are analyzed. The two control methods are implemented in PSCAD for the NYPA UPFC at Marcy substation. The performance of the two methods is observed for step changes in active...
This paper introduces a variable interleaving technique for photovoltaic cascaded DC-DC converters. A series rather than parallel connection of converters allows higher switch utilization and lower rating of components; however, they suffer from nonhomogeneous irradiations condition. Under partial shading conditions, the input power of all PV panel will not be the same and as a result the output voltage...
In order to synchronize the distributed control systems (DCS) in modular converters such as Advanced Modular Multi-level Converters (AMMC) and Modular Transformer Converter (MTC) to the supervisory controller, a network layer must be established, and appropriate control architecture must be designed. In this paper, different control architectures for DCS with application in AMMC and MTC including...
A novel ZVS range control technique using an auxiliary series transformer for a Dual Active Bridge (DAB) DC-DC converter is proposed. The auxiliary transformer fed with an additional H-bridge at the secondary, adds a phase-controlled voltage in series with the main converter voltage either at the primary or secondary. This addition helps to control the reactive power flowing through the main converters...
Recently, Voltage Source Converter (VSC) based Multi-Terminal DC (MTDC) transmission systems have gained more attention. Compared to current source converter technology, voltage source converters have several benefits including higher power quality, lower power transmission losses, and higher voltage capability. Flexibility in bidirectional power flow control is the main advantage of voltage source...
The ultrahigh voltage (> 12 kV) SiC IGBTs are promising power semiconductor devices for medium voltage power conversion due to feasibility of simple two-level topologies, reduced component count and extremely high efficiency. However, the current devices generate high dv/dt during switching transitions because of the deep punch-through design. This paper investigates the behavior of dv/dt during...
The Dual Active Bridge (DAB) bidirectional dc to dc converter has gained a significant popularity in high voltage, high power due to its several topological advantages. Due to non-ideal switching characteristics and delays in gating, DC bias may be generated in the high frequency transformer leading to increased loses and eventually saturation and failure of the transformer and the switches. This...
Convertible Static Transmission Controller (CSTC) is a versatile power electronic system which is installed across a transmission transformer. The proposed solution provides several integration options with multiple operational modes. The CSTC can be used to control the power flow in a meshed transmission grid or to extend the life time of existing transformers by partially bypassing and conditioning...
The paper investigates a soft-switching partial-resonant link AC/DC converter. The proposed converter uses 4 active switches and overcomes the various shortcomings of conventional resonant AC Link schemes such as the need for a four-quadrant ac switch. The switching operations occur at zero voltage instants thus lowering the losses. The input current is harmonic free. It can perform buck and boost...
This paper presents emulation of dynamic behavior of a wave energy converter in test bed condition. To evaluate performance of the electrical generator and associated power electronic converter in wave energy conversion (WEC) system, it is important to have the WEC device driving the generator. However, in test bed, the actual WEC device can not be installed. Rather, it is convenient to have an electrical...
Voltage Source Inverters (VSIs) are essential component for integration of renewable energy sources into utility grid or microgrid. Most of the utility grid regulation standards demand high quality sinusoidal current regulation by these inverters with renewable sources, which necessitates the use of LCL filters at the output of VSIs. Different load conditions and other factors influence grid conditions,...
In this paper, the operation of Voltage Source Converter (VSC) based multi-terminal DC (MTDC) transmission system is evaluated under loss of converter station. From the control point of view, i) Master/Slave control method, and ii) droop control method are explored to control the multi-terminal DC grid. This paper compares different control methods for MTDC control under normal and loss of any terminal...
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