The solid-state transformer (SST) is an interface device between ac distribution grids and dc systems. SST consists of a cascaded multilevel ac/dc rectifier stage, dual active bridge (DAB) converter stage with high-frequency transformers to provide regulated 400-V distribution, optional dc/ac that can be connected the bus residential 120/240 V <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$_{\rm...

Integrating a battery energy storage system (BESS) with solar photovoltaic (PV) or wind farm can make these intermittent renewable sources more dispatchable. This paper focuses on the development of control strategy for optimal use BESS this purpose. The considers rule-based scheme, which is solution problem defined, to incorporate operating constraints BESS, such as state charge limits, charge/discharge current and lifetime. goal have provide much smoothing possible so that resource be...

Integrating a battery energy storage system (BESS) with large wind farm can smooth out the intermittent power from farm. This paper focuses on development of control strategy for optimal use BESS this purpose. The considers conventional feedback-based scheme revisions to incorporate operating constraints BESS, such as state charge limits, charge/discharge rate, and lifetime. goal is have provide much smoothing possible so that be dispatched an hourly basis based forecasted conditions....

Integrating a battery energy storage system (BESS) with large wind farm can make more dispatchable. This paper focuses on development of control strategy for optimal use the BESS this purpose. The considers an open-loop scheme to incorporate operating constraints BESS, such as state charge limits, charge/discharge current and lifetime. goal is have provide much smoothing possible, so that be dispatched hourly basis based forecasted conditions. effectiveness has been tested by using actual...

Medium-voltage (MV) SiC devices have been developed recently which can be used for three-phase MV grid tie applications. Two such devices, 15 kV insulated-gate bipolar transistor (IGBT) and 10 MOSFET, opened up the possibilities of looking into different converter topologies distribution interface. These in drives, active filter applications, or as front end solid-state transformers (SSTs). The transformerless intelligent power substation (TIPS) is one application these devices. TIPS...

Recently, renewable wind energy is enjoying a rapid growth globally to become an important green electricity source replace polluting and exhausting fossil fuel. However, with being uncontrollable resource the nature of distributed induction generators, integrating large-scale wind-farm into power system poses challenges, particularly in weak system. In paper, impact static synchronous compensator (STATCOM) facilitate integration large farm (WF) studied. First, actual two nearby WFs...

Due to wider band gap of silicon carbide (SiC) compared (Si), MOSFET made in SiC has considerably lower drift region resistance, which is a significant resistive component high-voltage power devices. With low on-state resistance and its inherently switching loss, MOSFETs can offer much improved efficiency compact size for the converter those using Si In this paper, we report performance new 1700-V, 50-A designed developed by Cree, Inc. Hard-switching losses with different circuit parameters...

This article proposes an approach for realizing the power delivery scheme extreme fast charging (XFC) station that is meant to simultaneously charge multiple electric vehicles (EVs). A cascaded H-bridge converter utilized directly interface with medium voltage grid while dual-active-bridge based soft-switched solid-state transformers are used achieve galvanic isolation. The proposed eliminates redundant conversion by making use of partial rated dc-dc converters individual EVs. Partial...

This paper proposes a synchronous reference frame based controller for hybrid series active filter system. A system has been designed, built and installed at Beverly Pump Station in New England Electric utility 765 kVA adjustable speed drive load to meet IEEE 519 recommended harmonic standards. The is rated 35 kVA-4% of the kVA, controlled by act as isolator between supply load. discusses basic structure addresses its operation under nonunity loop gain conditions. Design trade-offs...

This paper presents a new control scheme for parallel hybrid active filter system intended harmonic compensation of large nonlinear loads up to 50 MVA, meet IEEE 519 recommended standards. The is small rated, 2%-3% load kilovoltampere rating. based on the concept synthesizing dynamically variable inductance, and its usefulness demonstrated an filtering application. A synchronous reference frame (SRF) controller implements varying negative or positive inductance by generating inverter voltage...

Adjustable speed AC drives with low input current THD are becoming increasingly important in industry. This article has detailed the implementation of a parallel active filter, which is integrated within 450 kW adjustable drive to provide an overall system conforms IEEE 519, and provides significant benefits on level. The design filter seen be driven by specifications include THD, efficiency, displacement power factor, high level integration load converter, cost targets. Active operation...

The next-generation electric power system, known as the smart grid, will incorporate a large number of renewable energy resources that fundamentally change management paradigm. In order to manage efficiently supply and demand in routers are required which adjust dynamically distribution is so called Energy Internet. We discuss this paper functional expectations on router design present our preliminary research results architectural construction communication performance. This documents...

Compared with neutral-point-clamped (NPC) inverters, active NPC (ANPC) inverters enable a substantially increased output power and an improved performance at zero speed for high-power electrical drives. This paper analyzes the operation of three-level (3L) ANPC under device failure conditions, proposes fault-tolerant strategies to continuous operating drive systems single multiple open- short-failure conditions. Therefore, reliability robustness drives are greatly improved. Moreover,...

Wind power is one of the most promising emerging renewable energy technologies for distributed generation (DG). In this paper, a new nine-level active neutral-point-clamped (9L ANPC) converter proposed grid connection large wind turbines (WTs) to improve waveform quality output voltage and current. Therefore, bulky passive filters can be reduced or even removed. The topology, operating principles, control schemes, main features, as well semiconductor device selection are presented in detail....

This paper presents a new feedback control strategy for balancing individual DC capacitor voltages in three-phase cascade multilevel inverter-based static synchronous compensator. The design of the is based on detailed small-signal model. key part proposed controller compensator to cancel variation parts can balance when H-bridges run with different switching patterns and have parameter variations. It has two advantages: 1) work well all operation modes (the capacitive mode, inductive...

The Solid State Transformer (SST) is one of the key elements proposed in National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ¿Future Renewable Electric Energy Delivery and Management¿ (FREEDM) Systems Center. SST used to enable active management distributed renewable energy resources, storage devices loads. In this paper, Generation-I single-phase 20 kVA, based on 6.5 kV Si-IGBT for interface with 12 distribution system voltage. design parameters, overall...

This paper proposes a combination of low- and high-frequency hybrid active power filter (APF) to operate in parallel for better performance. The individual APF is series L-C with the corresponding voltage source inverter. dc links both inverters are connected parallel, link maintained by low-frequency inverter (LFI). eliminate lower order higher harmonics, respectively. In addition, it possible design LFI such that can also compensate reactive load. topology designed take care specific...

This paper presents a pulse width modulation (PWM) technique for the minimization of leakage current in grid-connected/stand-alone transformerless photovoltaic (PV)-cascaded multilevel inverter (CMLI). The proposed PWM is integrated with MPPT algorithm and applied to five-level CMLI. Furthermore, using high-frequency voltage transitions terminal common mode voltages are minimized. Thus, minimizes PV array electromagnetic interference filter requirement system without addition any extra...

The solid state transformer (SST) is one of the key elements proposed in National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ldquoFuture Renewable Electric Energy Delivery and Managementrdquo (FREEDM) Systems established 2008. SST used to enable active management distributed renewable energy resources, storage devices loads. In this paper, a 20 kVA based on 6.5 kV IGBT for interface with 12 distribution system voltage. average model control scheme including...

This paper presents predictive current-mode control for a single-phase high-frequency transformer-isolated dual-active bridge dc-to-dc converter. The algorithm increases the bandwidth of current loop converter which enables tracking reference within one switching cycle. further demonstrates that application can remove transient dc offset from in isolation transformer Direct protects saturation even at conditions. has been implemented on an experimental setup and tests have performed to...

The solid-state transformer (SST) is a promising power electronics solution that provides voltage regulation, reactive compensation, dc-sourced renewable integration, and communication capabilities, in addition to the traditional step-up/step-down functionality of transformer. It gaining widespread attention for medium-voltage (MV) grid interfacing enable increases energy penetration, and, commercially, SST interest traction applications due its light weight as result medium-frequency...

Medium-voltage (MV) silicon carbide (SiC) devices have opened up new areas of applications which were previously dominated by silicon-based IGBTs. From the perspective a power converter design, development MV SiC eliminates need for series connected architectures, control multilevel topologies are necessary applications, and inherent reliability issues associated with it. However, when used in these they exposed to high peak stress (5-10 kV) very dv/dt (10-100 kV/μs). Using calls gate driver...

Silicon carbide (SiC) MOSFET is capable of achieving better efficiency and power density converters due to its low on-state resistance lower switching losses compared silicon (Si) Insulated Gate Bipolar Transistor. Operation at higher frequency using SiC devices allows reduction in filter size hence improves the weight ratio converter. This paper presents characterization 1200-V 100-A module compares a two-level voltage source converter (2L-VSC) MOSFETs Si IGBTs. Also, various design...

The 15-kV silicon carbide (SiC) MOSFET and SiC IGBT are the two state-of-the-art high-voltage devices. These devices enable simple two-level converters for a medium-voltage (MV) voltage source converter (VSC) topology compared with complex three-level neutral point clamped other multilevel topologies, which, otherwise, is required to realize MV VSC This paper characterizes module at 10- 12-kV dc bus different configurations of device under test. also presents endurance test (continuous...

This paper proposes a new 7-level inverter topology for induction motor drives. It is hybrid formed by cascading 5-level active neutral-point-clamped with 3-level T-type converter. obtained using low-voltage semiconductor devices voltage blocking capability of Vdc/3 and Vdc/6. The uses three floating capacitors per phase, which are balanced within pulsewidth modulation (PWM) switching duration switching-state redundancies each pole-voltage level. Topology forms two stacks at the front-end,...