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In this paper, a new common inductor current sharing method is proposed for multi-phase LLC resonant converter for high power application. Automatic current sharing is achieved by using a common resonant inductor for all the LLC resonant stages, by connecting the resonant inductors in each phase in parallel. The proposed method can automatically share the load current without any additional circuit...
An improved steady-state model is developed in this paper for the dual-active-bridge (DAB) dc-dc converter. It is first shown how the well-known ideal model fails to predict DAB dc characteristics, and that differences in model predictions compared to experimental results can be very large, especially in cases where the DAB series tank inductance is relatively small. A new analysis method is then...
In this paper, the current sensorless control for dual-boost half-bridge (DBHB) converter with power factor correction (PFC) function is presented. The short-through problem can be avoided by the dual-boost structure for enhancing the reliability. It also reduces the power dissipation due to the body diodes' reverse recovery current of switches. Furthermore, the intrinsic voltage-doubler characteristic...
An adaptive carrier based sinusoidal pulse width modulation (SPWM) technique for cascaded h-bridge (CHB) multilevel converters is presented in this paper. The proposed technique enables the CHB topology to provide a symmetrical ac voltage from a set of time-variant input dc source voltages. Two alternative approaches, namely the single-carrier and dual-carrier algorithms, are described for implementing...
Electromagnetic transients resulting from voltage dips complicate the low-voltage ride-through (LVRT) of doubly fed induction generator (DFIG) based wind turbines (WTs). To study the transients deeply, an analytical method to solve the dynamic response is presented in this paper. Although some attempts have been made in literature, the accuracy cannot be ensured, or the physical significance implied...
This paper presents a novel zero current softswitching (ZCS) pulse width modulation (PWM) bidirectional dc-dc converter (BDC) under the high frequency(HF) switching condition. In the proposed soft-switching BDC, all the power devices operate by ZCS commutation modes with aid of the edge-resonant switching cells, whereby the switching power losses can be minimized. The buck and boost voltage regulation...
This paper extends the boundary control law for conventional boost converters based on natural switching surfaces, and improves both the steady state and transient response. Additional switching zones on the normalized state plane are defined to decide switching behavior. Operation with state limitations, capacitor equivalent series resistance, and parasitic losses is examined and verified in simulation...
Natural balancing of the flying capacitor converter is activated when the converter is operating with phase shifted carrier PWM and the carriers are exactly interleaved. The mechanism is stable and has many benefits but the dynamic response can be slow. In this paper a novel active balancing approach, based on the application of an off-line optimized phase shift of the individual carriers during the...
This paper presents a practical auto-tuned digital controller for LLC resonant dc/dc converters that results in virtually minimal possible output voltage deviation during transients. During transients the controller applies a two-step frequency change algorithm such that the minimum deviation and seamless transition to the new steady state is achieved. The fast voltage regulation is obtained through...
There is need to develop fault detection techniques for reliable real-time diagnosis of axial-flux permanent magnet machines as they are now widely used in a variety of applications. Thus this paper presents detection techniques for interturn short circuit in an axial-flux permanent magnet machine based on a combination of torque and current monitoring using finite element analysis and experimental...
This study examines the mechanism and effectiveness of current sharing in a multiphase, series capacitor buck converter. The automatic current sharing mechanism is inherent to the series capacitor buck topology and uniquely utilizes its series capacitor. Unlike conventional multiphase buck converters, current sharing is achieved without any current sensing circuits or added external control loops...
Voltage mode and dual-loop current-mode linear schemes are widely used for controlling boost converters due to their simple implementation and fixed frequency PWM operation. Nevertheless, the dynamic response of the voltage loop is usually limited by the characteristic non-minimum phase behaviour of the boost topology. On the other hand, excellent dynamic performances can be achieved with boundary...
The increasing number of renewable energy sources at the distribution grid is becoming a major issue for utility companies, since the grid connected converters are operating at different operating points due to the probabilistic characteristics of renewable energy. Besides, typically, the harmonics and impedance from other renewable energy sources are not taken carefully into account in the installation...
The zero-voltage switched (ZVS) PWM converter exhibits low primary-side switching loss and generated EMI. Furthermore, the ZVS technique can be used to increase the converter efficiency and higher power density. In this paper the ZVS operation of the MOSFET switches leveraged for a three-phase, isolated AC/DC converter is analyzed and operating states during the switch transitions discussed. The presented...
The boost inverter topology achieves both boosting and inversion in a single stage. Various controllers have been implemented on boost inverters to obtain stable operation. However, the double loop control strategy is the most appropriate because it provides good performance under nonlinear loads, abrupt load variations and transient short-circuit conditions. The double loop control strategy was introduced...
To achieve higher output PWM frequency with limited switching frequency of devices, a topology named parallel frequency-multiplication is employed in this paper, which, however, leads to more serious current spike and oscillation in the turn-on transient because of the parallel of devices. Aiming at this issue, the theoretical analysis of transient process is presented to explain how the current spike...
Brushless Doubly-Fed Induction Generator (BDFIG) is potential for power generation applications for its high reliability and low maintenance-cost. There are two operation modes for BDFIG: grid-tied and stand-alone modes. The grid-tied mode usually uses the power winding (PW) synchronous and orientation frame since PW is connected to the grid; however in stand-alone mode, the PW is connected to the...
Microinverters mounted on each photovoltaic (PV) panels are gaining popularity due to their benefits such as incremented energy harvest and plug-play operation. This paper proposes a single-stage zeta microinverter for PV applications. The proposed topology is based on a high frequency (HF) transformer isolated zeta converter with a single low side switch on the primary side of transformer. The unique...
High voltage conversion ratio converter is required in broad range of applications such as microgrid, hybrid electrical vehicles, telecommunication and medical equipments. The control-to-output transfer function of a conventional quadratic boost converter reveals that right half plane (RHP) zero exist, which makes the controller design difficult. The device has to operate on extremely high duty cycle...
In this paper, a radial-chordal decomposition (RCD) technique is proposed to decouple the power angle and voltage control of a smart load based on the use of electric springs (ES). The paper gives a highlight of the decoupling feature and the merit of achieving multiple functionalities within a single ES. This RCD control method has been tested on a 2 kW small-scale power system. Experimental results...
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