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Leakage current reduction is one of the most important issues for transformerless PV grid-connected inverters. Many interesting single-phase topologies have been reported to reduce the leakage currents. However, three-phase PV inverter topologies with reduced leakage currents are not received much attention. In this paper, a new family of three-phase topology is proposed to reduce the leakage current...
This paper presents the analysis of mixed mode noise in an H-bridge PWM converter. Based on the definition of differential mode (DM) and common mode (CM) noise voltage source and noise current and the time domain voltage and current relationship, noise prediction models are proposed in frequency domain for CM, DM and mixed mode (MM) noise with the consideration of system symmetry regarding the noise...
This paper proposed a positive sequence detector (PSD) based on cascaded delayed quadrature signal cancellation (CDQSC). The delayed quadrature signal cancellation (DQSC) operator based on two orthogonal signals in dq-frame or αβ-frame can be tailored to eliminate any specified harmonic. The proposed DQSC operator can be further cascaded to stepwise reject all undesired harmonics. Then the conditioned...
With increasing penetration of grid-connected photovoltaic (PV) power generation in distribution network, the equivalent impedance of the distribution network and the distribution capacitance of the interconnection cables are changed. The changed impedance network may be excited by the harmonic current of inverters or the harmonics of the grid voltage, which will affect the power quality and stable...
Regular condition monitoring of rotating machines using advanced spectrum analysis reduces the unexpected breakdown and excessive maintenance of the machines. If the irregularities are not identified in the early stage, the reliable operation of the machines are affected which may become catastrophic to the operation of the rotating machines. Therefore, this paper presents an online condition monitoring...
Resonant wireless power transfer (RWPT) has been widely studied in recent years. In this paper, a descriptive approach of the circuit theory with normalized resistance is proposed and applied to the analysis of relay resonators using four important factors: the source matching factor, the load matching factor, the transfer quality factor, and the reflected impedance factor. The explicit closed-form...
Wireless battery charger system architecture equipped with adaptive multi-phase rapid charging algorithm based on a simplified electrochemical battery model is proposed. Excellent rapid-charging performance operated with the proposed wireless charging platform has been experimentally verified to show more than 70% charging time reduction compared to conventional constant-current constant-voltage (CC-CV)...
The majority of wireless power systems transfer power in a directional manner. Recently, 3-dimensional wireless power transfer has been addressed by several research groups. This paper describes a new discrete magnetic field control technique that can ensure omni-directional wireless power transfer in an efficient manner. The proposed control has been successfully implemented. Both theoretical and...
Light-emitting diode (LED) technology involves highly complex interactions of heat, light, power and color. Dimming a bi-color LED system with color mixing feature will alter the power and junction temperatures, which in turn shift the color spectra of the LEDs. In this paper, a closed-loop control method based on the nonlinear empirical LED model is proposed for decoupling the dimming control and...
To solve the problem that the structure and parameters of neural network are hard to be tuned, a modified radial basis function neural network (RBFNN) method based on improved particle swarm optimization algorithm (IMPSO-RBFNN, for short) is proposed. In the proposed method, the IMPSO algorithm is utilized to optimize RBFNN, and the nearest neighbor cluster algorithm (NNCA) is introduced into RBFNN...
The modular multilevel converter (MMC) has become one of the most promising converter topologies for medium/high-power applications. As the MMC is structured based upon stacking up of a number of series-connected identical SubModules (SMs), to improve its fault tolerance and reliability, SM failure detection and location is of significant importance. In this paper, two SM-failure detection and location...
The main technological challenges issues of ultra-deep-water umbilicals is taken to reliability of integrated high-voltage power cables and production umbilical (IPU) by electromagnetic interference and high thermal effect. Due to their functional intergraded system and cost-effectiveness, the aim of this study is to evaluate the thermal and electromagnetic characteristics of a large bore central...
Grid-connected inverter are commonly utilized to interface renewable energy sources into the utility, especially for micro-grid and distributed generation system applications. Different from available direct power, direct voltage, or direct current based control strategies of grid-connected inverters for renewable energy integration, to achieve flexible operation, the direct impedance control of grid-connected...
A small-signal model based on droop control and utilized in microgrid of photovoltaic (PV) inverters is designed in this paper. The parallel-inverter system composed of two 1kVA PV inverters with no communication line is built on the basis of small-signal model. The influence of droop coefficients on the system stability and dynamic response ability is analyzed by utilizing root locus analysis in...
The current trend in isolated microgrids is oriented to distributed renewable energy generators, such as photovoltaic (PV) generators and their corresponding distributed energy storage systems (ESS) as an unit denoted as active generator (PV+ESS). In an isolated microgrid, every distributed generator (ESS or PV) may operate in two operation modes (grid-forming or grid-following) in accordance to specific...
Active equalizers, with a higher efficiency in comparison to passive ones, have the disadvantage of using a considerable number of components. The wave-trap concept allows the battery cell equalizer to use its switching frequency as the control variable that decides which cell is being charged. Hence, the number of controlled switches is strongly reduced without reducing the performance of the system...
This paper proposes three topologies of multilevel dynamic voltage restorer (DVR) with application in three-phase systems (balanced and unbalanced) to compensate sags/swells. The topologies use three independent dc-links (one per phase) and each converter is mounted with one three-level NPC leg (3L) and one two-level leg (2L), furnishing a five-level (5L) voltage at its output. This proposed topologies...
This paper investigates the design of 3-winding coupled inductor for minimum inductor current ripple in rapid traction battery charger systems. Based on the general circuit model of 3-winding coupled inductor together with the operating principles of dc-dc converter, the relationship between the ripple size of inductor current and the coupling factor for a 3-winding coupled inductor is derived under...
Series LC-filtered active damper can be used to stabilize the grid-tied voltage source converter in a non-ideal grid. The operation principle of the active damper is to mimic a damping resistance at the resonance frequencies. However, the selection of the damping resistance has not received much attention. Also, parasitic capacitance of the grid transmission line brings new challenge for the application...
This paper proposed control strategy of induction motor (IM) fed by indirect matrix converter (IMC) in reverse power mode. The IMC is an AC/AC power conversion system without dc-link energy storage elements as bulky capacitor or inductor. For this reason, the IMC has many advantages that compact, low weight and durability. Furthermore, it features full four quadrant operation and sinusoidal input...
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