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This paper presents different control schemes for parallel operation of voltage source inverters with stiff grid depending on droop control based technique. Methods are analyzed and compared for presenting a new hybrid control scheme with highly improved dynamic response regardless of the grid parameters uncertainties and without communication link among interconnected units. Decoupling control of...
The objective of this paper is to ensure compatibility between cutting blade velocity and the removed tissues without lacerations. This maintains the integrity of the tissues adjacent to the tumor. A Support Vector Machine (SVM) algorithm is applied to the Head and Neck tumors images. This includes two main steps, identifying the region having Laceration, and measuring the percentage of the laceration...
In this paper, an experimental eleven-phase induction machine is simulated when operating at fault conditions using Finite Element (FE) analysis. Two fault cases representing one phase and two phases open are considered. Two optimization techniques are employed to calculate the optimum phase currents under phase(s) loss to maintain the same Magneto-Motive Force (MMF) distribution as with the healthy...
This paper is the second part of the review titled “Harmonics in HVDC Links, Part I - Sources”. The effects of harmonics on power systems in addition to the harmonics reduction techniques in HVDC systems will be discussed in this complementary paper.
Power Electronic converters are known to be generators of harmonics on both of their alternating current (AC) and direct current (DC) sides. They also transfer existing harmonics from one side to the other with an associated change of frequency. In other words, the converters intercouple the AC and DC systems and thus act as a transfer medium for harmonics. In part I of this two-part paper, sources...
This paper introduces a survey of different maximum peak power tracking (MPPT) techniques used in the implementation of photovoltaic power systems. It will discuss different 30 techniques used in tracking maximum power in photovoltaic arrays. This paper can be considered as a completion, updating, and declaration of the good efforts made in [3], that discussed 19 MPPT techniques in PV systems, while...
This paper is the 2nd part of the survey titled “High Voltage Direct Current Transmission - A Review, Part I”. The main converter technologies and HVDC systems' components will be discussed in this complementary paper.
This paper presents a new switching strategy controling the most-common, simple, and well-known three-phase six-switch voltage source inverter (VSI). Via this strategy, each one of the six transistors conducts for 150°, instead of the known 180° or 120° conduction-modes, resulting in a new space voltage-vector diagram (SVD). For a wye-load connected to the VSI, the known 6 active and 2 zero voltage-vectors,...
Major milestones in the development of high voltage direct current (HVDC) technologies and concepts were achieved in 1950s. Thanks to the high power thyristor switches (1960–70s), the HVDC technologies reached a significant degree of maturity in 1980s. The classical HVDC uses thyristor-based current-sourced line-commutated converter (LCC) technology. The advent of power semiconductor switches in 1980–90s,...
Several enamel frit recipes were formulated for direct‐on application on sheet steel. Their suitability as hot water and acid‐resistant coatings were investigated. DTA analyses were performed on raw batches to follow up physico‐chemical changes occurring on firing. Then batches with different recipe compositions were fritted and mixed with mill additions. These were then tested for thermal expansion...
This paper presents a new modification for the most-common, simple, and well-known three-phase voltage source inverter (VSI). In this modification, each one of the six transistors conducts for 150° instead of the usual 180° or 120° conduction modes. For a wye-connected load, the output phase-voltage becomes a seven-level, 12 Steps waveform- which is closer to the sinusoidal...
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