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For relatively low voltage dc sources such as photovoltaic arrays and fuel cell stacks to supply power to typical AC systems, using multilevel inverters is an approach with several advantages. In doing so, while it is possible to achieve optimal THD below 5% by staircase/block modulation of cascaded H-bridge multilevel inverters, this requires the use of several separate dc sources with different...
This paper focuses on the design, thermal loading and reliability of a three-level Neutral Point Clamped (3-L NPC) back-to-back full scale converter for a 10 MW direct-drive wind turbine equipped with a Permanent Magnet Synchronous Generator (PMSG). The reliability performance of the three-level converter is strongly influenced by the thermal behaviour of the semiconductor devices and their mission...
This paper presents theoretical analysis of the dc link capacitor current ripple reduction in the HEV dc-dc converter and inverter system by using a proposed carrier modulation method. This carrier modulation method introduces a modified triangle carrier, with a switching frequency that is twice as much as the inverter's, for the dc-dc converter to synchronize this dc-dc converter output current with...
An alternating control technique for phase-shift full-bridge converter is proposed to achieve thermal balance of power devices. For full bridge converter with phase shift control, zero-voltage switching can be realized. However, the power devices of leading leg are with higher thermal temperature since the related current to achieve ZVS is much higher than that for lagging leg. An alternating control...
The zero-vector configurations have great influence on the performance of the practical implemented space vector modulated AC-DC matrix converter (MC). In this paper, the optimized switching pattern that reduces the output inductor current ripple and the narrow pulses is presented. The optimal zero-vector duty cycles for different switching patterns are derived based on the output inductor current...
This paper is focus on the application of a AC-DC matrix converter (MC) in the battery energy storage system (BESS). The converter topologies of the energy storage system are discussed. A combined control strategy of the AC-DC based BESS is proposed according to the modulation method. At the battery side, the constant current/voltage charging and constant current discharging control are utilized to...
In this paper, the recently introduced control strategy referred to as model predictive pulse pattern control (MP3C) is adapted to the ACS 2000 five-level power converter of ABB. The drive consists of an induction machine and a five-level active neutral-point clamped (ANPC-5L) inverter. The power inverter is fed with optimized pulse patterns (OPPs) that produce minimum harmonic distortion in the stator...
This paper describes a bidirectional inverter topology for standalone applications. The topology, consisting of a Quadratic Boost Converter based Voltage Source Inverter (VSI), can achieve high conversion ratio both in inverter as well as rectifier operations without the use of a transformer. In addition, the same architecture can also be used to realize DC-DC conversion (both Step-Up and Step-Down)...
This study presents a solution for reducing the frequency oscillations in multi-area interconnected power system by means of using an VSC-HVDC interconnection transmission line. The upcoming power-electronics based HVDC transmission system offers new features that can be advantageous for improving the frequency control and thus for enhancing the stability in transmission networks. This paper is structured...
Overmodulation is frequently required during the transient interval at high speed operations of interior permanent magnet synchronous motors (IPMSMs). In this work, an overmodulation method is developed in the synchronous reference frame with a provision of assigning different priorities to d and q-axes currents. During the current boosting in motoring, the d-axis current is increased by priority...
In Medium Voltage grid-connected high power converters, due to switching frequency limitations, bulky and expensive passive filters are needed in order to limit the harmonic content in the point of common coupling (PCC). In this paper, a design procedure that optimizes the cost and volume of a LCL filter is proposed and experimentally validated, taking into account the effect of current and voltage...
Z-source inverters are a new class of inverters proposed with output voltage or current buck-boost ability. Despite their general attractiveness, there are some present limitations faced by existing Z-source inverters. Most of which are linked to their requirement for low modulation ratio at high input-to-output gain, and the presence of an impedance network. The former means a high dc-link voltage,...
For high power converter designs, a performance screening with hundreds or thousands of configuration combinations and operation points is typically required. Standard time-domain based circuit simulators are not efficient for such screening works because of the long computation time. In this paper, a modeling and simulation methodology is presented, which is ultra-fast compared to time-domain based...
A new control strategy for megawatt scale series connected multilevel photovoltaic (PV) inverters is proposed. The proposed strategy ensures balanced operation under partial shading. Further under transient grid conditions such as low voltage ride through (LVRT) it is shown that the system remains connected and is fully controllable. In the proposed system, the PV arrays are grouped into zones and...
This paper proposes the development and implementation of a hybrid maximum voltage utilization controller for interior permanent magnet synchronous motors (IPMSMs) over a wide operating region. It has a structure that combines the current vector control (CVC)-type Maximum Torque Per Ampere (MTPA) controller and the modulating voltage scaled controller (MVSC). Particularly, the current regulator is...
Trapezoidal voltages can be used to compensate for the inverter nonlinearity. Especially, the modulating shape of those voltages facilitates adaptations to varying operating conditions. In this paper, practical schemes were proposed to improve the performance of the compensation method using the trapezoidal voltages. After those schemes are detailed, their effectiveness is confirmed through experimental...
A new hybrid control of soft switching boundary conduction mode (BCM) inverter that features an easy digital implementation and reduced number of analog components is presented in this paper. A traditional half-bridge three-phase inverter topology can realize soft switching through implementing BCM operation, thus no additional power devices or magnetic components are required. The proposed hybrid...
Matrix converter (MC) can be used as ac type distributed generator (DG) interface in microgrid. Reverse power flow operation of MC can be implemented to meet voltage boost requirement, where the input ac generator is connected to the converter's voltage source side and the output utility grid or load is connected to the current source side. During grid fault or intentional islanded operation, the...
This paper describes the main requirements and challenges regarding the application of a Matrix Converter (MC) for aerospace power conversion. The challenges are reviewed in terms of (i) the input-filter (and output-filter) design, (ii) the selection of semiconductor switches and commutation-strategy, and (iv) the PWM strategy. The aerospace application of the MC requires operation at an input-frequency...
This paper proposes a novel 3-D space vector modulation scheme for three-level three-leg neutral point clamped converter used in the three-phase four-wire active power filter towards the performance optimization among load harmonic current compensation, mid-point voltage balancing, and Suppression of switching loss increase. Optimization functions for different objectives are analyzed based on the...
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