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This work will present a novel photovoltaic (PV) inverter with integrated short-term storage. The topology combines advantages of microinverter topologies, such as module-specific maximum-power-point tracking, failure-tolerance, safety due to limited voltages, modularity, use of low-cost low-voltage components such as silicon field-effect transistors (FET), and simple expandability, with those of...
In low-voltage ride-through or unbalance gird voltage condition, the fundamental fluctuation in the neutral-point (NP) voltage of three-level voltage source converter will appear under imbalanced grid voltage situation and has not been researched in detail. A new NP current model under imbalanced grid is developed to investigate the limitations of conventional nearest-vector modulation and to give...
A novel hybrid resonant zero-voltage zero-current switching PWM full-bridge converter with capacitive output filter is proposed in this paper. The hybrid resonant converter, with two full-bridge cells sharing a bridge leg and connecting the secondary windings of two transformers in series, operates in discontinuous current mode and can achieve zero-current switching for main power switches and rectifier...
This paper intends to evaluate the impact of the wire tightness degree on circular pad with different Archimedean spiral coil size in Inductive Power Transfer (IPT) system. The effect mainly focuses on the sensibility of coupling coefficient to misalignment and gap variation with constant self-inductance when the dimension of the secondary coil is fixed. In this paper, the larger outer diameter of...
Power packaging technology plays an important role to achieve high performance for high voltage (HV) generator. The HV generator packaging techniques are systematically classified according to different component level packaging and system assembly technology. Both component level packaging and system assembly technology are included in the review and their advantages and disadvantages are discussed...
This paper proposes a reducing technique of carrier noise of PWM inverters without increasing the carrier frequency during zero-speed drive of a permanent magnet motor. The feature of the proposed technique is that the frequency component of the carrier noise is diffused by zero-sequence voltage. In particular, the zero-sequence voltage is randomized by the M-sequence signal and added to the voltage...
Modular multilevel converter (MMC) receives wide acceptance in high power, high voltage applications. However, large capacity capacitors are needed in the sub-modules due to low frequency fluctuation power. The voltage fluctuation is even larger especially in the startup of Motor drive or low frequency output application. Besides, the integrated energy storage systems (ESS) in MMC is used for recovering...
This paper proposes the design of maximum power point tracking based on fuzzy logic control for standalone PV system. A complete model of the fuzzy logic maximum power point tracking for standalone PV system is compiled and loaded on the eMEGAsim using the RT-Lab real-time simulation platform from Opal-RT. The effectiveness of the proposed fuzzy logic control has been compared with the perturbation...
The three-level T-type inverter has received much interest in energy storage system due to high efficiency. This paper proposes a modulating method for three-level T-type to produce balanced three-phase output voltage with no low-order distortion even for different voltage of battery banks in series connection. In addition, the zero-sequence injection is realized to control the neutral current so...
The increasing number of mobile devices are the main reason for the development of a power bank. However, it needs a physical connection with the portable device in order to transfer power. In recent years, efforts were made to eliminate the need of cords and cables for charging devices. Bluetooth can be used for wireless power transfer. However, the mobile device should be powered-on. In this research...
Islanded operation of microgrid is sensitive to frequency and voltage fluctuations due to lack of inertia. This makes it vulnerable to disturbances and intermittent renewable generation. Integration of energy storage devices is an effective but expensive solution to stabilize the microgrid. Electric Spring (ES) is a new power electronic based smart grid technology which can be used to provide voltage...
A pulsewidth-modulation (PWM)-based sliding mode control (SMC) scheme for improving the dynamic performance of a series-series compensated wireless power transfer system (WPT) with maximum energy efficiency tracking (MEET) is proposed in this paper. In this system, the receiver module comprises a buck-boost converter that is regulated using SMC to emulate the optimal load value, following the maximum...
Distributed static series compensator (DSSC) is a new type of distributed FACTS devices that can realize accurate control of power flow and enhance voltage stability. Thus, it could be installed in stability-limited transmission systems widely. This paper presents a new capacity control model for DSSCs and deduces the corresponding power flow equations. To illustrate the effect on system power voltage...
The electricity load of large consumers has the characteristics of fluctuating randomly in a short period and changing periodically over a longer time scale. In recent years, the influence of these kind of consumers on regional load has been increasing year by year, which has become an important factor to improve the forecasting accuracy of the entire load. In this paper, we use parameters-improved...
Power electronics equipments can cause serious electromagnetic interference (EMI) because of their high-speed switching. Such switching disturbances then propagate along power cables, which can act as antennas to radiate the noise. Typically, a passive filter composed of inductors and capacitors is widely used to reduce electromagnetic interference. However, when a power cable is connected to the...
In this paper, the feasibility of the simultaneous induction heating of the impeller and the vessel of the mixer. For basic investigation, the experiments of the double plates configuration is investigated. New equivalent coil measurement method is also shown. By using this method, the equivalent circuit of the induction heating system can be also easily estimated. The experimental results show the...
The nonlinear loads in microgrid not only distort the voltage but also degrade the harmonic power distribution in a conventional droop-controlled microgrid. This paper starts with analyzing the trade-off between voltage total harmonic distortion (VTHD) and harmonic sharing effectiveness. A multi-framed droop controller is proposed to improve the harmonic power sharing without deteriorating VTHD by...
Solar energy has the characteristics of intermittent and unstable, and it results in the negative impact on power quality of the utility grid while the penetration rate of the grid-connected photovoltaic generation system is increased. The energy storage system (ESS) can alleviate the negative impact on power quality of the utility grid so as to increase the penetration rate of the grid-connected...
This paper proposes a novel type of active cell balancing circuit using the multi-winding transformer. This scheme is applied auxiliary circuit for controlling the charging and discharging current of the Lithium-ion battery. Conventional schemes using a multi-winding transformer require a large magnetizing inductance to satisfy the allowable charging and discharging current of the battery cell. In...
The PWM half-bridge zeta (HBZ) converter is one of the most attractive dc-dc converters for wide-input-voltage applications due to its extended duty ratio above 0.5 and soft switching capability. However, it suffers from large peak current stress in the primary and secondary devices. To relieve these drawbacks, a PWM resonant HBZ converter is proposed. The proposed converter can effectively reduce...
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