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Three-level ac-dc converters are widely used in high-voltage input applications due to the reduced voltage stress on switches and extended range of dc link voltage. For three-level ac-dc converters, the asymmetry of the main circuit and drive circuit can result in voltage unbalance among the split dc link capacitors, which would cause higher voltage stress on the power switches and the output rectifying...
This paper presents the flexible dc capacitor voltages balancing control method for star-connected cascaded H-bridge converters. In this paper, the power flows are analysed by investigating all the converter's control freedoms. Based on the analyses, users can accomplish dc capacitor voltage balancing with both negative-sequence current and zero-sequence voltage. These two kinds of control options...
A novel quasi-Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter features high voltage gain with lower voltage stress of the impedance network capacitors and has common ground for input and output. Moreover, both the input source current and output load current of the proposed converter are continuous, which provides...
In this paper, a half-bridge dual LLC converter with symmetrical autotransformer is proposed. The advantages of the proposed converter are that the dual LLC resonant tanks and symmetrical autotransformer can reduce the current stress of components, achieve high efficiency, and increase step-down conversion ratio and high power density. All active switches are turned on at ZVS and rectifier diodes...
This paper introduces the use of machine saliency as one of the parameters for the sizing of a three level inverter dc-link capacitor. A new nearest three vector (NTV) balancing algorithm is also introduced for the dc-link capacitors. A comparison between a two and three level inverter was conducted whereby the inverter input dc current for the two level inverter registered higher ripples than that...
An isolated inverter based on differential output is proposed. The inverter is composed by two phase-shifted full bridges (PSFB) converters. The two PSFBs share a common leg which works as the lagging one on the primary side. Two current-doubler synchronous rectifiers (CDR) are on the secondary side and constitute differential structure. With the same DC bias and phase-reversed AC components in the...
Traditional rectifiers such as the half-wave and full-wave rectifiers have been the only configuration used in resonant inductive links. Despite their popularity, their input current contains a large amount of harmonics which makes them incompatible with resonant inductive links especially those driven by a Class D or Class E resonant inverter. This paper presents a half-wave Class D voltage-switching...
This paper presents a design framework to select the best topology and conversion ratio of operation for series-parallel capacitive buck/boost DC-DC converters. The framework models all converter families providing design insights and tradeoffs among the various topologies. We select the 10 optimal topologies that always performs better than any of the 96 permutations that are possible for series-parallel...
With non-linear loads such as power electronic equipment getting more and more widely used in industrial and civil applications, harmonic current are becoming more damaging to electricity systems on both the power grid side and user side. An effective way to solve the problem is to us e the harmonic filter equipments. Active power filter (Active Power Filter, APF) compensates each harmonics simultaneously,...
The main objective of this paper is to propose a new state-space modeling approach for AC-DC single-stage power factor correction (PFC) buck-boost converters by using a modified version of conventional state-space modeling approach. In the paper, the operation of a singlestage PFC buck-boost converter is briefly reviewed and the proposed modeling approach is introduced and explained in detail. It...
The induction machine in the operating mode of generator is a very valuable alternative to the synchronous machines. Especially in lower nominal power rating range, such solution can be more cost effective. Induction machine with a squirrel-cage rotor cannot generate a reactive power and even more it is a permanent consumer of the reactive power. In this paper, we strive to define theoretical limits...
Novel step-up DC/DC converter is introduced in this paper. This converter is realized with adding the switched capacitor voltage multiplier cell to the three switch step-down DC/DC converter that has been proposed in the literature. The proposed converter is analyzed in the steady state and the voltage transfer gain is obtained. It is also demonstrated that the voltage stress on all semiconductor...
This work introduces a new Multiple-Input Multiple-Output Modular Multilevel dc-dc Converter (MIMO-MMC). The proposed topology has a bidirectional structure and may be utilized in both low and high power applications ranging from approximately 100W to 10MW. The modular structure of the MIMO-MMC enables efficient component utilization through module voltage and current sharing capabilities. The topology...
Recent advancements in renewable energy has created a need for both high step-up and high efficiency dc-dc converters. These needs have typically been addressed with converters using high frequency transformers to achieve the desired gain. The transformer design, however, is challenging. This paper presents a high step-up current fed converter based on the classical Cockcroft-Walton (CW) multiplier...
The Solid State Transformer (SST) enables intelligent integration of renewable resources with the grid. The rectifier, grid tie inverter and black start modes of SST operation are discussed in this paper. A previous study [3], did a preliminary investigation of the black start capabilities of the SST. This paper further investigates the control structures and validates them through PSCAD simulations...
Model Predictive Control (MPC) offers many advantages over more traditional control techniques, such as the ability to avoid cascaded control loops. Unfortunately, as a result of the lack of presence of a modulation strategy, this approach produces spread spectrum harmonics which are difficult to filter effectively. Furthermore, high switching frequencies may be needed because of the limited number...
In this paper, reliability evaluation of the capacitor bank for the Modular Multilevel Converter (MMC) based on two common types of the DC-Link capacitors i.e. Aluminum Electrolytic and Film capacitors is investigated. Because of the high current ratio through the capacitor in the MMC, it is shown that in the Film capacitor because of the low ESR, the power loss and the core temperature rising will...
High-voltage capacitor charging power supply (HV-CCPS) is an important part of the capacitive pulsed power system. This paper mainly focuses on the analysis, design and implementation of HV-CCPS, which employs the phase-shifted series resonant converter (PS-SRC) as topology. When PS-SRC operates at over-resonant state, it has three operation modes. The electric characteristics and boundary conditions...
The most basic type of circuit simulation consists of solving the nonlinear state equations of a circuit as a function of time, starting at given initial conditions. But both chaotic and stiff circuits present solutions that involve numerical errors inevitably amplified during simulation. For this reason, in particular for circuits of moderate order with nonlinear characteristics approximated with...
The aim of this work is to describe the general design procedure of a Modular Multilevel Converter (MMC) applied as an Active Front-End (AFE) for a magnet supply for beam accelerators. The dimensioning criteria for the converter and the dc-link capacitance are presented and the grid transformer requirements are set. Considering the converter design, the arm inductance calculation is based on the specifications...
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