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The paper proposes a current source based Dynamic VAR Compensator (DVC) control strategy. The switching unit in this DVC topology is composed of series connected switch and diode also termed as the “current switch”. The proposed controller has been designed to force discontinuous conduction mode operation thus fundamentally different from the traditional constant current source based control system...
This paper proposes a multilevel series compensator (MSC) to deal with: i) voltage sags/swells, ii) harmonic compensation or iii) reactive power compensation. Such a device can be considered as a dynamic voltage restorer (DVR) or a series active power filter (Series-APF). The MSC can improve the power-quality of loads located in stiff systems. The configuration is based on three-phase bridge (TPB)...
This paper describes a fast protection circuit for silicon carbide metal-oxide semiconductor field-effect transistors (SiC MOSFETs) subjected to hard-switching faults (HSFs). In terms of reliability of power converters, the protection of power semiconductors against short-circuit failures is of great concern. The reverse transfer capacitance increases with decreasing drain-source voltage during normal...
The increasing load, increasing level of penetration of renewable energy and limited investment in transmission infrastructure have significantly increased the need for a smart, dynamically controllable grid. This paper proposes a power flow control device to maximize asset utilization, improve reliability, and reduce congestion. To ensure low cost of implementation and high reliability, the technology...
Dual-active-bridge (DAB) topology requires a powerful controller to realize voltage conversion and address fast load transients. A controller with nonlinear feedforward and linear feedback loops is able to facilitate a DAB converter to fulfill this requirement. The nonlinear feedforward loop is designed based on the nonlinear model of the DAB converter. The linear feedback loop is realized as a traditional...
The need for a low-cost, high reliability power flow control technology is becoming exceedingly clear in the face of increased renewable penetration and electrification of automobiles. This paper proposes a power routing technology called the compact dynamic phase angle regulator (CD-PAR) for dynamic control of active/reactive power. The proposed device is a hybrid solution realized by pairing a fractionally-rated...
This paper proposes a new senseless start-up method by using a terminal voltage/current without position sensor. A flux estimator consisting of field flux model, P controller and flux voltage model is proposed and rotor angle/speed is estimated by using a phase locked loop. Furthermore, initial rotor angle is estimated rapidly and accurately by using the same flux voltage model during the initial...
In this paper, a radial-chordal decomposition (RCD) technique is proposed to decouple the power angle and voltage control of a smart load based on the use of electric springs (ES). The paper gives a highlight of the decoupling feature and the merit of achieving multiple functionalities within a single ES. This RCD control method has been tested on a 2 kW small-scale power system. Experimental results...
In this paper, a detailed mathematical presentation of Photovoltaic (PV) generation system, as well as its simulation model based on MATLAB / Simulink is established first. Its inverter-based simplified models, i.e. the switching-function equivalent model and average model, are simulated and compared quantitatively from different aspects. Simulation results reveal that the switching-function equivalent...
This paper discusses both dc-voltage balancing and ac-voltage minimizing of all the floating capacitors in a modular multilevel cascade inverter (MMCI-DSCC) intended for medium-voltage high-power synchronous-motor drives. It presents theoretical and numerical design considerations on both amplitude and phase of three-phase motor currents. A three-phase DSCC inverter with phase-shifted-carrier pulsewidth...
This paper proposes a new current-ripple-based control strategy for the Series Ripple Cancellation Converter (Series RCC), which eliminates LED light flicker caused by Power Factor Correction (PFC) stage and significantly reduces its output capacitance. Instead of sensing two differential output voltage signals as in existing voltage-ripple-based control strategy, the proposed current-ripple-based...
Modular multilevel converters (MMC) are used in the applications such as medium voltage multi-megawatt drives and in HVDC power transmission. The converter has several sub-modules connected in series that are switched appropriately to regulate the pole voltage. Besides regulation of output voltage, it is also essential to regulate the individual sub-module capacitor voltages. In this paper, a novel...
This paper proposes a soft-switched three-port single-stage inverter (TPSI) for a photovoltaic (PV)-battery system. Compared to the existing soft-switched TPSIs, the proposed TPSI has the advantages of using the least number of switches and that all of the switches are capable of being turned on under the zero voltage switching (ZVS) condition. A prototype of the TPSI without using electrolytic capacitors...
Nowadays, to improve power quality and meet the energy demand, several studies point to the widespread use of Distributed Generation (DG) units equipped with power line conditionning capability. This work proposes a simplified structure and its related control system for Photovoltaic (PV) generation that embodies an Active Power Line Conditioner (APLC), allows harmonic minimization and active power...
Droop control is an effective power sharing control scheme of distributed generation (DG) inverters in islanding AC microgrid, which can stabilize the grid as long as the distributed generation systems have sufficient residual power. On the contrary, many loads have equipped with power conversion circuits in front to improve the operational efficiency, e.g. air conditioners and LED lighting, which...
In this paper, a hierarchical control system based on a novel autonomous current sharing controller for grid-connected microgrids (MGs) is presented. A three-level hierarchical control system is implemented to guarantee the power sharing performance among voltage controlled parallel inverters, while providing the required active and reactive power to the utility grid. A communication link is used...
In electric vehicle (EV) systems, bi-directional DC/DC converters are applied to interface the battery bank with the high voltage DC-link of the inverter. The control of the DC-link voltage is important for the high performance of the system. A DC-link voltage control strategy for the bidirectional DC/DC converter is proposed, which eliminates the need for detecting the operating mode and do not need...
This paper introduces a new modulation scheme for a Modular Multilevel Converter incorporating the selection of inter-phase module inductance chosen so its resonate frequency is sufficiently higher than both the switching and AC output frequency of the M2LC converter.
A novel high-power modular input-series-input-parallel output-series connected DC/DC converter for medium-voltage application is proposed. Emphasis has been placed on power sharing control to compensate parameter mismatches and achieve equal power distribution between modules. Converter control is extended to achieve fault-tolerant operation by exploiting modularity to provide redundancy in the event...
This paper proposes a control system design for cooperated stabilizing control of PMSG based grid connected wind farm. In this study, a wind farm composed of PMSGs and SCIGs is considered to be connected to multi-machine power system. Though outputs of the SCIG based wind turbines are collected on AC network, PMSG based wind turbines are integrated in DC network with single grid side converter. In...
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