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The technique of both the electric lightings and the electric vehicles have been more and more grown and the power consumption is very important part. This paper presents a phase shift full bridge(PSFB) converter with the zero-voltage-switching range expansion. In addition, the proposed converter provides both good efficiency and low switching device noise. The experimental and simulation results...
In order to improve performance of switched reluctance motor (SRM) at high speed, a new hybrid asymmetric and buck-boost fronted converter for SRM with active boost voltage capability is proposed. Different from existing converters with boosting voltage, the proposed converter has an active regulation ability of boosting voltage, in which voltage level is independent from switching and dwell angels...
As the use of electric energy increases rapidly due to the development of the worldwide industry, The ESS is attracting much attention in terms of efficient energy use. The ESS consists of various components such as battery, BMS, PCS and PMS. And PCS is the largest weight and volume among these components. The reasons are that the reactor for the high-frequency filter and the isolation transformer...
This paper discusses a single-phase inverter with a buck-boost converter for single-phase applications such as photovoltaic (PV) systems. The inverter consists of a buck-boost converter and an H-bridge unfolder circuit. The inverter requires only 1 controllable switch to obtain 100 Hz pulsating DC-link voltage. However, a conventional PV inverter requires two-stage power conversion. Thus, the power...
Recent years, multilevel inverters have become more attractive for researchers due to low total harmonic distortion (THD) in the output voltage and low electromagnetic interference (EMI). This paper proposes a three-phase cascaded H-bridge quasi-switched-boost inverter (CHB-qSBI). The advantages of the proposed inverter are as follows: buck-boost voltage with single stage power conversion, reduced...
In this paper, a novel three-port converter(TPC) for stand-alone photovoltaic(PV) power system application is proposed, and also presents the control strategy and power management of this converter. This converter uses three power switches, two inductors and switched capacitor structure to obtain a higher voltage gain and reduce the voltage stress of the power switches. The control for the converter...
In order to increase the weighted efficiency of the photovoltaic micro-inverter, this paper proposes a flexible topology DC/DC converter as the former stage in the micro-inverter. The flexible converter includes two operation topology, which are improved dual-switches forward topology and full-bridge topology, respectively. The operation principles of the two topologies are introduced and the design...
In this paper, a fluid-thermal coupled finite element model is established to calculate the temperature field of dry type air core reactor, the inner structure of reactor is built both considering the calculation accuracy and computation time. According to simulation results, the detailed temperature distribution regularity are given both with and without the rain cover, and it can be achieved that...
Vibration suppression is one of the key issues to be solved in the design and application of reactors. At present, the vibration reduction of reactors is mainly concentrated on vibration isolation structures and vibration isolation material. The optimization design of lower vibration reactors has not been reported. In this paper, a novel method inserting negative giant magnetostrictive material (NGMM)...
A high gain single stage buck-boost inverter (SSBBI) is proposed in this paper. The proposed topology has low semiconductors count, only four switches. The tapped inductor is applied to attain high gain feature. One-cycle control (OCC) is adopted to control the SSBBI and attain superior source ripple rejection. The paper presents the operation principle of the proposed topology, and the derivation...
In this paper, ZVT interleaved bidirectional LDC(IB-LDC) with switching frequency modulation for mild-hybrid electric vehicle is proposed. The IB-LDC is composed of interleaved buck and boost converters employing an auxiliary inductor and auxiliary capacitors to achieve zero-voltage-transition. Operating principle of IB-LDC according to operation mode is introduced and mathematically analyzed. Moreover,...
The fast command tracking provided by the dual-loop fast finite-settling-step (FSS) control for a DC-to-DC converter has been shown to have more energy saving capability than using the conventional PID controller. FSS control is developed based on the accurate nonlinear converter modeling. Thus, circuit parameter mismatch can affect the performance of FSS control so that the loss minimization capability...
Single-phase two-stage inverters generally use an intermediate capacitor to buffer the power imbalance between DC input and AC output. However, the resultant low-frequency voltage ripple on this intermediate capacitor may produce low-frequency ripple at the source side, especially when the front-end dc/dc converter operates in continuous conduction mode (CCM). Some common solutions to reducing this...
The performance of reactive power sharing in an islanded microgrid is significantly affected by feeder impedance, mismatch parameters and unbalanced local load. To reduce the negative impact of mismatched link impedance on reactive power sharing, the adaptive virtual impedance strategy for voltage compensation is proposed with paralleled inverters in an islanded mode. The on-line adaptive control...
This paper proposes a three-level bidirectional DC-DC converter with an auxiliary inductor for wide zero-voltage switching (ZVS) in high-output voltage applications. The auxiliary inductor is connected across the middle node of the split flying capacitors and the center tap of the secondary winding in the transformer. The phase-shift angle in three-level stage can facilitate the ZVS of the switches...
This paper reveals a kind of adjustable reactor. Firstly, it introduces the basic principle of the reactor. The reactor is based on a transformer with air gap. The current signal of primary side is detected and then directly injected into the secondary side. In this paper, the phase difference(caused by time delay) between the detected current signal of primary winding and the injected current signal...
Energy crisis and environmental pollution are a serious threat to human survival and sustainable development. To alleviate the energy crisis and maintain the living environment of mankind, people develop and utilize new energy sources such as solar energy and wind energy. In order to ensure the safe and reliable use of the battery, and improve the performance of the battery after group, the battery...
Single-stage buck-boost gird-connected inverter is widely used in distributed generation systems because of low cost and high efficiency. However, shoot-through problem exists, so reliability of the system is reduced. In addition, output voltage of renewable energy resources varies widely with load and environmental condition, so voltage stress of switches is high in wide input-voltage range application...
This paper proposes a novel integrated control system including PMSM drive and vehicle-to-grid (V2G) technology based on open winding PMSM. It realizes motor drive mode and bidirectional energy flow for Electric Vehicles in V2G control mode. These modes can be switched easily and smoothly according to commands from integrated controller. Compared with the traditional EVs control system which controls...
The electrostatic precipitator (ESP) system depends heavily on the three-phase IGBT intelligent inverter high voltage (HV) power supply. To improve the dynamic responses of ESPs during the event of flashovers and back corona, a magnificent nonlinear-controll technology called hysteretic current-mode control (HCMC) concept is proposed based on the working characteristics of ESPs. This method adapts...
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