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In this paper, a hybrid multilevel inverter topology for the generation of dodecagonal space vectors is presented which eliminates all (6n±1), n=odd harmonics from the motor phase currents in the entire range of modulation with an increase in the range of linear modulation. The topology is a hybrid of flying capacitor, H-bridge and conventional two-level inverter cells. With this topology, any standard...
Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle to achieve sinusoidal input currents operation of three-phase...
The paper considers on-board battery charging of electrical vehicles (EVs) using a multiphase voltage source and a multiphase propulsion motor. The multiphase inverter and the multiphase machine are fully integrated into the charging process. The proposed integrated on-board battery charger has an advantage of unity power factor operation with no torque production in the machine during the charging...
More and more wind power plants are built which use voltage source converters (VSC) to feed energy into grid. This paper compares two different control techniques and shows how virtual flux direct power control (VFDPC) reduces filtering requirements at the output of the converter and helps to save up to one quarter of converter losses. Furthermore the influence of a reduced, variable dc link voltage...
In this paper the recently introduced control strategy referred as variable switching point predictive torque control (VSP2TC) is employed to control a three-level neutral point clamped (NPC) voltage source inverter driving an induction machine (IM). Based on a predictive torque control (PTC) scheme, the controller aims to reduce the high current and torque ripples that occur. In order to actualize...
Parallel voltage-source inverters with common dc bus present very interesting advantages from an industrial point of view. Indeed, by paralleling several units the power supply system includes capability to handle high power requirement, modularity and the possibility of maintenance through redundancy, within an uninterruptible supply operation. However, a special attention is required to avoid the...
A novel modulation strategy for matrix converters based on space vector representation is outlined in this contribution. In particular, the method is applied to a thyristor matrix converter connecting a multi-phase generator of varying frequency with the fixed-frequency three-phase grid. Compared with the well-known space vector modulation for a three-phase voltage source inverter, the elementary...
This paper shows a method to saturate the negative sequence current in an active rectifier. The goal is to utilize better the remaining current capacity of the converter, considering that the positive sequence current references have already been decided in a separate synchronous reference frame.
Due to the challenge for sensorless control of concentrated windings (CW) interior permanent magnet synchronous machines (IPMSMs), this paper presents the analysis of a novel stator IPMSM for sen-sorless control based on high-frequency rotating voltage signal injection method. The topology of the machine is introduced and the new IPMSM has the advantage of less space harmonics. The sensorless control...
In this paper three different implementations of the full-state feedback linear-quadratic (LQ) controller for a 3-phase 4-leg sine wave inverter are compared. The LQ controller is designed in stationary reference frames abc and αβγ as well as in a dq0 reference frame rotating with the fundamental output frequency, and is not cascaded with any inner controller. In the proposed control schemes integral...
The efficiency of a motor drive combined with an inverter increases by exploiting the maximum voltage level that can be provided by the inverter. This paper presents a novel control strategy for permanent magnet synchronous machines in the field-weakening range. The inverter's voltage margin is utilised completely using only the variation of the torque angle and avoiding any zero voltage vectors in...
Space Vector Modulation (SVM) approaches that decrease current ripples and switching losses of voltage source inverters for automotive applications and their DSP implementation are presented in this paper. To improve the quality of the energy delivered by the voltage source inverter (VSI), we combine two modulation strategies; Random Space Vector Modulation (RSVM) and Discontinuous Space Vector Modulation...
This paper presents encoderless model predictive control scheme with time-varying sliding mode observer for a complete wind turbine system. The wind turbine system consists of a back-to-back converter (AC/DC/AC) and a direct-drive permanent-magnet synchronous generator (PMSG). We give a complete model of the system and present encoderless fixed-frequency model predictive direct torque control of the...
In this paper, a novel fault detection method based on cost fault evaluation is proposed. The cost function is same as one used in finite control set model predictive control of power converters. Two simple methods are presented to locate the faulty IGBT. Considered methodology is studied for fault detection and fault tolerant operation in a five phase PMSM drive. Theory has been developed and validated...
This paper deals with the one-loop flatness-based control of a Permanent Magnet Synchronous Machine fed by a coupled inductors Quasi Z-source Inverter. Among arguments in favor of this control strategy, it can be pointed out both the high mastering of the transient states and the high bandwidth of a one-loop control. Some improvements are proposed in this paper to saturate the state variables in order...
In this work the design and control of a four-phase induction machine (4P-IM) is addressed. The 4P-IM is controlled using a four-phase voltage source inverter (4P-VSI) with a generalization of the classic direct torque control (DTC) scheme. An analysis of the available valid switching states and voltage space vectors is developed and a switching table is obtained. Finally, the system's fault tolerant...
The reduced capability of the 5L-NPC Inverter to balance the voltages of the four DC-bus capacitors makes this converter unattractive for real power applications. This is especially true if the load demands active power. The Back-to-Back (B2B) configuration of two 5L-NPC converters and the use of a Space Vector Modulation (SVM) that exploits the voltage balancing capabilities of the redundant switching...
The aim of this paper is to present a FPGA-base emulation system allowing us to test PWM strategies dedicated to automotive voltage switching inverters. This study is mainly focused on the behavior of the DC bus of this converter, especially the current in electrolytic capacitors. Indeed, the proposed emulator will be used in a health monitoring system of these components that are well known as the...
This report presents an extension of the Field Oriented Control technique to suppress the 5th and the 7th current harmonics of an IPMSM. The influence of the current harmonics on the fundamental control loop is analyzed and a proposition for their identification is given. Two additional control loops — in parallel with the fundamental control loop-have been implemented and succeed in controlling the...
A continuous set nonlinear model predictive control (CS-NMPC) for a permanent-magnet synchronous machine (PMSM) is proposed. With an effective cost function optimization algorithm, the output voltage vectors are continuous. Compared with finite set model predictive control (FS-MPC), CS-NMPC can decrease the current and torque ripple dramatically, and have the same dynamic performance. Furthermore,...
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