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Detailed analysis and the parameter design of damped LCL filters applied in three phase voltage source converters is carried out in this work. Relations between the LCL filter parameters (L1, L2, C and R) and the corresponding transfer function parameters, including ωs, ωc, ωz and ωR, are investigated mathematically and demonstrated explicitly. Based on this methodology, a reasonable and optimal design...
SRMs, switched reluctance motors, are being expected as an excellent candidate for power sources in harsh environments due to the simple structure. In spite of many methods proposed to eliminate the rotor position sensor, which is needed to commutate the current correctly but not compatible with harsh environments, no successful sensor-less method has been seen so far. The method proposed in this...
Today's PV micro-inverters (MIVs) provide a modular solution for generation, however the energy storage architectures remain centralized, requiring an additional bi-directional ac-dc converter, with complex cell balancing circuits. Distributing storage capacity within the smart PV panels allows power fluctuations to be locally buffered, while minimizing the need for additional power electronics and...
This paper implements a 15-W power amplifier for piezoelectric actuators which is mainly composed of a flyback converter and a power operational amplifier. The flyback converter offers a variable DC output voltage to the power operational amplifier, which outputs an amplified sinusoidal wave with a voltage gain of 20 V/V and a DC bias of 100 V to drive the piezoelectric actuator. The output voltage...
This paper presents a division-summation (D-Σ) digital control for a three-phase bi-directional photovoltaic inverter with wide inductance variation. The bi-directional inverter fulfilling grid connection and rectification with power factor correction has been implemented in the laboratory. The proposed D-Σ approach summarizes the inductor-current variations over one switching cycle to derive control...
This paper describes fast analytical model for computation of the switched reluctance machine's (SRM) nonlinear magnetization characteristic and torque lookup table. The flux-tube and the gage-curve methods are used to develop this fast analytical model. Presented model is used for computation of the magnetization characteristic and torque lookup table of three and four-phase SRMs. The simulation...
This paper presents a novel single phase switched reluctance motor (SRM) which can be directly driven by commercial AC power supply without any switching circuit and sensor. This proposed SRM is optimized based on a simple design technique. The optimized machine has aimed to be higher motor efficiency than conventional induction motors (IMs). In addition, the novel SRM can achieve the start-up with...
This paper introduces concept of discrete control method of class E amplifier which keeps nominal operation for varying load resistance. In the proposed method, shunt capacitance and output resonant capacitance are varied electronically by setting status of switches which are connected to capacitances. Proposed method can keep nominal operation, i.e., ZVS and ZDS, both when load resistance is higher...
This paper proposes an improved modulated carrier control method for a continuous conduction mode (CCM) power factor correction (PFC) boost converter. The proposed method allows precise sinusoidal line current shaping for a boost PFC converter operating in CCM. This is accomplished by simply comparing the compensated modulated carrier signal with the switch current information, such that the current...
Three-level boost PFC converter has advantages of lower inductor current ripple and lower switch withstanding voltage than the boost PFC converter. Interleaved current sensorless control (ICSC) had been proposed for multiphase boost PFC converters. In this paper, ICSC is modified for current sensorless control of the three-level boost PFC converter with the asymmetric loads. The modified interleaved...
Cooperative Study Group on Standard Model Development for Power Electronics Simulations, created under the Industry Applications Society of the IEEJ (Institute of Electrical Engineers of Japan), is active to develop standard models for simulations related to power electronics. Under the study group, four working groups (WGs) have been created for different fields of simulation. Among them, Smart Grid...
Permanent magnet synchronous motors have been widely used due to their high performance and high efficiency. In this paper, we talk about the control of a 750kW permanent magnet synchronous generator which is used for a hybrid turbocharger for a marine application. The controller outputs regulated 700V dc bus voltage with a voltage variation of less than 5% under 100% load transient condition to ensure...
The harmonic currents generated by the line-side converter of high speed trains may cause the time-varying resonances when the harmonic frequency is close to the resonance frequency of the power supply line. It may destroy the facilities in the power supply range and affect the operation of trains. To avoid the affection, the characteristic of resonance impedance is calculated and simulated with a...
Gallium nitride (GaN) power semiconductor technology offers a potential for significant performance increase in power electronic converters. This potential cannot be fully exploited if GaN devices are used as drop-in replacement for silicon devices in existing systems. This paper investigates the switching limits influenced by the device output parasitic capacitance and parasitic inductance of the...
The paper presents a novel modeling approach of the power flow in a bidirectional dual active bridge DC-DC converter. By using basic superposition principles, the mathematical distinction of cases is avoided in the modeling process of high-frequency transformer currents for different types of modulation. The generalized model is used in an optimization of converter losses of a 3.3 kW electric vehicle...
Super -junction MOSFETs and shielded gate trench MOSFETs are widely used especially for PFC and DC-DC converters for networking and computing power supply systems that require high efficiency and power density. With smaller parasitic capacitances, the latest SJ MOSFETs have extremely fast switching characteristics and therefore reduced switching losses. But, naturally this switching behavior leads...
Phase-modular isolated PFC rectifiers are an interesting alternative to phase-integrated three-phase rectifiers. The use of a matrix-type converter allows to achieve isolation with a single-stage energy conversion. This paper presents a phase-modular isolated matrix-type rectifier, which can be connected to the mains either in star (Y) or delta (Δ), enabling a wide input voltage range. A detailed...
The authors have proposed a new capacitive power transfer (CPT) system using one-pulse switching active capacitor (OPSAC). The proposed system improves power transfer efficiency without LC resonance so that it is robust against parameter change. In this paper, a small sized vehicle powered by CPT is investigated to verify the practicability.
The rotor position sensor is required to control Permanent Magnet Synchronous Motor (PMSM). However, the rotor position sensor, for example, Resolvers or Pulse Generator (PG) have some disadvantages which are an increase of total volume of the motor, fault of power supply lines and signal lines of these sensors, and maintenance. To overcome these difficulties, sensorless control methods have been...
H-bridge cascaded static synchronous compensator (STATCOM) is often used to compensate the harmonic and reactive current derived from non-linear load. However, with the special topology structure, the voltage balancing of DC capacitors of H-bridge cascaded STATCOM is a key problem. Many papers adjust active voltage to solve this problem with the conventional PI controller which needs to regulate the...
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