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With a high penetration of renewable energy in the grid, virtual synchronous generator (VSG) technology is proposed to be a solution for stability controlling of micro-source inverter. VSG can effectively solve the problem of renewable energy actively connected to the grid. This paper focuses on the control design and small-signal modeling of multi-parallel VSGs. Simplified virtual inertia controller...
This paper introduces an improved operation mode called Fast-swap charging mode (FSCM) for on-board-powered light rail (LR) networks. The main concept is to swap the depleted energy storage units for fresh, pre-charged units after the light rail vehicle arrives at the first/last station, instead of charging them during daily operation. The proposed operation mode allows the empty energy storage components...
The “More Electrical Aircraft” concept involves a significant increase of power demand in modern aircrafts. In this context, a new high voltage DC distribution system has been proposed. This makes it necessary to develop a new generation of DC-DC converters to supply the 28VDC loads. These converters must comply with stringent requirements in terms of power density and electromagnetic compatibility...
This paper proposes a new magnetic charging design for Inductive Power Transfer systems (IPT) based on a flat solenoid. The proposed design uses a single transmitter pad to transfer energy to two receivers pads. This magnetic design is suitable for stationary charging system applications including automatic Guided Vehicles (AGVs) and public transportation electric vehicles like buses. A 3D Finite...
The main goal of this work is to show the advantages of two-phase cooling technology for thermal management of high power electronics modules, with a SKIM909GD066 motor inverter as the test device for thermal/fluid analysis. Dissipated power, heat transfer coefficient and fluid temperature are set in a 3-D FEM (Finite Element Method) based thermal model to simulate two-phase cooling of IGBTs at the...
Cascaded Multi-level inverter for synchronization of power generated from PV system to utility grid is reported in this paper. Inverters are prone to several types of faults e.g. switch failure or dc link capacitor failure. Failure mode analysis of cascaded H-Bridge is widely discussed in the literature. Various methods for post-fault operation with reduced capacity (due to module failure) but with...
This paper presents a Lyapunov-function based control approach with cascaded proportional-resonant (PR) controller for single-phase grid-tied LCL-filtered quasi-Z-source inverter (qZSI). The proposed control approach guarantees the global stability of the closed-loop system and zero steady-state error in the grid current. The reference values for the inverter current and capacitor voltage are generated...
Single-phase inverter suffers from double-frequency power ripples in the input side transferred there from the ac-side. To mitigate this ripple, two types of power decoupling approaches can be applied: passive power decoupling and active power decoupling. We present a technique of passive power decoupling realized by modifying the control strategy. The main idea is to produce the time-varying shoot-through...
Galvanically isolated impedance-source (IS) dc-dc converters are a high performance solution proven for emerging power electronics applications. However, studies of their bidirectional operation have been scarce. Focus in this paper is on the reverse power transfer possibilities of the high performance quasi-Z-source (qZS) series resonant dc-dc converter. This enables extension of functionality and...
In this paper, Active and Reactive power management with the utility grid is achieved by integrating 7-level quasi Impedance Source Inverter (qZSI) with Thyristor based elements (Thyristor Switched Capacitor (TSC) and Thyristor Switched Reactor (TSR)). Major portion of the reactive power is managed by the thyristor based elements and the remaining reactive power is managed by the cascaded qZSI. The...
This paper presents a 27-Level asymmetric multilevel shunt active power filter topology that allows the compensation of a nonlinear load, as well as the DC voltage regulation thanks to a comprehensive control strategy. The topology considers the ratio 9∶3∶1 in order to generate the AC waveform with a simple staircase modulation algorithm. The dynamic model of the proposed topology is obtained and...
Modular multilevel converters generate high voltage ripple in the floating capacitors which increases the harmonic content of arm voltages and currents and consequently the losses and can degrade the control performance. In order to reduce this voltage ripple, a large capacitance is usually employed, but the size and cost of the submodules and the whole converter are increased. In this paper the voltage...
The detailed real-time simulation of MMC-based HVDC links is one of the most challenging tasks in power system validation today, requiring the combined use of CPU and FPGA technologies. The inclusion of surge arresters in the real-time fault tests further increases the difficulties because of the highly non-linear characteristics of such protective devices. In this paper, the OPAL-RT digital real-time...
This paper proposes the modeling and control of a Solid-State Transformer built using a three stage conversion topology. First, a rectification stage is used, where a three-phase high-voltage AC signal is converted to a DC level; this stage is then followed by a DC-DC converter, and finally an inverter is used to convert the DC into a three-phase low-voltage AC signal. The adopted topology is modeled...
Capacitor natural voltage balancing in multilevel converters is a potentially attractive feature because it does not require capacitor voltage measurement and balancing control effort. The paper addresses DC-DC step-down Flying Capacitor Converter average balanced capacitor voltages for inductance dominated LR-loads (or resistive LC-filtered ones). Capacitor voltage unbalances, or offsets compared...
The paper presents SiC-based three-level T-type modules designed for a high-performance 30kVA DC/AC inverter operating at high frequency 85 kHz with low THD of the output voltage. This inverter system consists of two integrated parts. The first part is active and contains three parallel-connected three-phase T-type modules built with fast-switching SiC power transistors. The second, passive part of...
Renewable energy sources (RES) are expected to be essential assets in the future smart grid. The impact of renewable energy sources in the electrical grid mainly depends on their nature, their penetration rate and the topology of the grid. This paper addresses how a representative power quality parameter (the number of voltage dips) are affected by the inclusion of renewable energy sources. Specifically,...
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