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A grid-tied inverter can be designed to operate in boundary conduction mode or discontinuous current mode to achieve high efficiency and high power density. However, the switching frequency variation in boundary conduction mode can be a problem. Although the switching frequency in discontinuous current mode is fixed, the output current becomes distorted due to the resonant between inductor and parasitic...
A switching circuit system based on FPGA is designed and implemented in this paper to provide high-frequency adjustable-phase voltages for the ultrasonic motor. For the existing drive systems of the ultrasonic motor, the bus voltage is usually 12V DC or 24V DC supporting by an external adapter, the driving voltages of the ultrasonic motor, however, are required to be boosted yet. Then, the step-up...
Grid connected inverters with LCL output filters are widely used in exporting energy generated from renewable energy sources. The LCL filter and inductors used in this filter has important effect on inverter performance. Although it is different in high power levels nowadays, powder cores are commonly used in inductor design in low and medium power levels. In this study, inductors for LCL filter of...
Interleaved switching of parallel inverters has previously been proposed for efficiency/size improvements of grid connected three-phase inverters. This paper proposes a novel interleaving method which practically eliminates insulated gate bipolar transistor (IGBT) turn-on losses and drastically reduces diode reverse recovery losses. The reduction in switching losses are obtained by interleaving two...
Silicon carbide (SiC) devices are attracting attention as next generation power device because of their high breakdown voltage, low conduction loss, and fast switching speed compared with conventional Silicon (Si) device. SiC power device is expected to be used in electric vehicle and hybrid electric vehicle. The large di/dt and dv/dt in fast switching operation interact with parasitic component in...
This article focuses on Inductive Power Transfer to implement dynamic charging for electric vehicles. The system proposed is composed of adjacent 50-cm-side square coils set on the road, with only the coil under the vehicle activated for power transfer. It relies on a symmetrical circuit coupled to a symmetrical control using ZPA regulation to operate frequency-varying inverters, using soft switching...
This paper discusses the main circuit topology and control method of current source controller(CSC) for a three-phase induction motor. In the circuit, the three phase AC power supply is taken as the input part of CSC, which is rectified into three phase controlled rectifier. In DC circuit, the DC bus inductor is utilized to store energy and filters harmonic so that the circuit is shown as the current...
This paper presents an improved analytical model for estimating the high-frequency current ripple of interior permanent magnet (IPM) synchronous machines due to PWM switching. The proposed model accounts for the impact of slotting effects, magnetic saturation, and cross-coupling between the d- and q-axes. The model is subsequently used to investigate several factors that influence the PWM-induced...
Energy balanced control method for converters with natural trajectory tracking is presented in this paper, and is visualized to show converters' energy conversion inside converters. This paper specially designs and analyzes a single-phase full-bridge inverter based on energy balance with natural trajectory tracking. Natural trajectory tracking introduces a better dynamic response than the conventional...
A switching circuit system based on FPGA is designed and implemented in this paper to provide high- frequency adjustable-phase voltages for the ultrasonic motor. For the existing drive systems of the ultrasonic motor, the bus voltage is usually 12 V DC or 24 V DC supporting by an external adapter, the driving voltages of the ultrasonic motor, however, are required to be boosted yet. Then, the step-up...
Distributed renewable energy generations bring to attention the grid-connected inverter with LCL filter, whose control performance can be largely influenced by filter parameter variations. This paper has proposed a “comprehensive-loop-search, pattern-recognition, key-parameter-scan” method to evaluate the parameter variation influence, especially grid-side inductance and filter capacitance variation,...
The output active power and reactive power of new energy inverter can be controlled independently using vector control, but there are degrees of coupling between them under the influence of transmission line parameters. In this setting, an overall evaluation of the coupling degree of power is vital to achieve decoupling control. This paper indicates the root cause of inverter power coupling and necessity...
A DC-AC power inverter contains parasitic inductances in a DC-linked wire and a load wire. These parasitic components may cause oscillation in the output voltage of the inverter, and cause electromagnetic interference (EMI) issues to other power electronic circuits in the system. In this paper, an effect of the parasitic inductances on the DC-linked wire and load wire of the power inverter are analyzed...
Due to the advantage of realizing the boost converter, allowing the inverter working in the straight through state, Z source network inverter had been widely applied. However, the disadvantages of Z source Inverter, such as low boost capability and start-up impact, have restricted its development. In view of the above questions, this paper proposed a control method of single phase full bridge inverter,...
Design and simulation problems of high power full-bridge boost converter with 175…320 VDC supply voltage are considered. The converter under investigation consists of a full-bridge inverter, a boost high-frequency transformer, a diode rectifier connected to a capacitive filter and an active load. Additional inductance, connected in series with the transformers primary winding, is brought in the converters...
In most large-scale grid-tied photovoltaic (PV) plants, central inverter configurations are used, mainly due to higher converter efficiency and lower cost per kW. However, compared to other configurations, its Maximum Power Point Tracking (MPPT) efficiency is the lowest since it is the less distributed configuration. Under non-uniform conditions, as mismatch caused by aging and/or partial shading,...
This paper presents a division-summation (D-Σ) digital controlled three-phase four-leg voltage source inverter with load impedance estimation for uninterruptible power supply applications. The D-Σ digital control developed for current tracking can accommodate wide filter inductance variation, which has been successfully adopted in grid-tied applications. This paper proposes a load impedance estimation...
The latest trend in solar inverter application is to increase DC link voltage to 1500VDC for high power output. This paper describes a design concept of NPC1 power stack for 1500VDC megawatt level solar inverter. This stack uses three latest half-bridge IGBT modules with highest power density and operation junction temperature, which enable realization of power level beyond 1MW without paralleling...
This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
A novel solution to high efficiency and high specific power three-phase Back to Back Power Converters has been proposed and theoretically investigated in this paper. Target applications are variable speed gen-sets, electric drives and independent power supplies. The solution proposed is based on a novel 5-Level E-Type topology. Advantages of the new solution, such as significant reduction of the input/output...
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