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High Voltage DC systems are gaining widespread attention due to the advances in power electronic devices and converters. MMCs are very popular nowadays in this type of application. This paper first revisits the dynamic equations of the circulating current of a MMC to incorporate a disturbance term. Based on the modified equations, a disturbance rejection controller is proposed to eliminate the double...
This paper presents a new power control strategy of grid-connected converter under grid fault conditions. Positive-and negative-sequence reactive power are controlled separately in order to effectively support unbalanced grid voltage. Both maximum phase current limit and maximum active power oscillation limit are taken into consideration which makes the converter operate safely under grid faults....
The AHU (air handler unit) is one of the main research objects in HVAC (heating, ventilating and air conditioning) system containing coils, blower wheel, heater, etc. Most of the high efficiency blower wheels are driven by BLDC (brushless DC) motor. This paper mainly focuses on two severe problems in blower wheel, namely airflow blockage and unbalanced load of fan motor. Early diagnosis of these problems...
In this paper, a novel reverse zero-sequence current (RZSC) compensation strategy for three-phase four-wire back-to-back active power conditioner (APC) is proposed. The objective of the APC is to achieve the active and reactive power compensation between two micro-grids. However, for the unbalanced voltage sag micro-grid system, the double-line frequency oscillation exists in the output active/reactive...
Active gate driving provides an opportunity to reduce EMI in power electronic circuits. Whilst it has been demonstrated for MOS-gated silicon power semiconductor devices, reported advanced gate driving in wide-bandgap devices has been limited to a single impedance change during the device switching transitions. For the first time, this paper shows multi-point gate signal profiling at the sub-ns resolution...
In this paper, a robust controller is designed based on μ-synthesis method for grid-connected inverters. The performance of the controller is made robust against realistic uncertainties including the time delay and parameter changes, while the resonant oscillations are actively damped. The designed controller only relies on output feedback eliminating the need for extra feedback sensors that are normally...
This paper proposes the use of the feedback-linearization control technique for the regulation of the voltage amplitude and frequency of power-electronic converters. This control strategy linearize the trajectory of a nonlinear system between any two equilibrium points, and thus allowing to use linear control technique. The reference tracking robustness of the proposed control technique is assessed...
The microgrid inverter experiences the power oscillations and current harmonics in case of the unbalanced grid voltage faults. However, there is a trade-off between power oscillations and current harmonics should be considered in three phase three wire inverter systems during the conventional fault ride through control. In order to solve this problem, a novel control strategy is proposed to enhance...
Unbalanced voltage has adverse effects on power electronic interfacing converters (IFCs) operation such as output power oscillations, DC link voltage oscillations and peak current increase. These adverse effects can be aggregated in parallel IFCs with common DC and AC link, which are commonly used to connect AC and DC subsystems in hybrid AC/DC microgrid or to interface high-power distributed generations/storage...
In this paper, a special control solution called “Virtual Voltage Source” is developed for no-load tests of induction machines. This concept is applied to a 2×27 MVA high-power machine test bench, where the test bench is requested to precisely characterize e.g. 3 MW machines at no-load currents. The developed Virtual Voltage Source thoroughly solves the stability issue of induction machines at low...
To date, a family of series-connected boost converter (SCBC) with enhanced efficiency has been presented as the front-end dc/dc stage of distributed photovoltaic (PV) inverter, which suffers the severe PV voltage/power oscillation when operated under unbalanced grid voltage condition. This paper proposes an operational scheme to enhance the performance of one type SCBC, namely the dual-input central...
In this work it is presented a theoretical and experimental investigation of the influence of the low power oscillation due to the pulsating single-phase energy flow in a H-bridge voltage source inverter that operates connected to the grid and is fed by photovoltaic (PV) panels. That oscillation can be responsible for efficiency reduction of PV generators connected to the DC-bus of the inverter, as...
The safe operation of grid connected power converters during abnormal condition is a key issue in order to guarantee its operation and to avoid undesired trips. In this paper different control methods for the operation of a D-STATCOM are evaluated, where the reference currents are determined in such a way that none of the phase currents goes over the limits, as well as the DC voltage fluctuations...
SiC MOSFETs are known to provide a better performance compared to Si IGBTs. However, they can also introduce undesirable behaviors like switching oscillations due to the existence of parasitic elements. In this paper, we introduce the turn-on and turn-off switching equivalent circuit models and validate these models with commercially available SiC MOSFETs. Based on the models, theoretical analysis...
In this work, a hybrid energy storage system (HESS) comprising of ultra-capacitor and battery is proposed for smoothing oscillating power from wave energy conversion system (WECS). Using generated power data from an installed wave energy converter (WEC), each component of the proposed HESS is sized to optimize the cost of the energy storage. A control scheme is designed to regulate the power into...
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