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The paper studies pulse width modulation (PWM) techniques for a five-phase multilevel open-end winding drive with two inverters supplied with unequal dc-link voltages, which are in the ratio 2:1. It is shown in the paper that application of in-phase disposition modulation (PD-PWM), often used in multiphase multilevel converters, results in overcharging of the capacitor in the dc-link of the converter...
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...
Sensorless field oriented control has always been an area of study with many insecurities, parameter sensitivities and instabilities. In this paper, after giving a short overview of standard sensorless field oriented control algorithms, a new technology by Texas Instruments called “InstaSPIN” will be evaluated. InstaSPIN promises to solve all of the well-known problems of sensorless control as, weak...
Closed-loop control and modulation of AC drives with offline computed optimized pulse patterns can be achieved by manipulating the time instants of the switching transitions. During torque steps, faults and low-voltage ride through operation, however, the transient response time is often rather slow, due to the absence of an appropriate voltage vector. By inserting additional switching transitions,...
Discontinuous PWM method (DPWM) has been widely used in industrial area to reduce the overall losses; however, it is only effective at higher output frequency condition for an adjustable speed drive (ASD). At low speed condition, the time constant of the IGBT thermal system is much lower than that of the fundamental frequency of the inverter. The harmonics contents as well as the IGBT junction temperature...
An analytical solution in a closed form of the B4 converter working with a proposed optimized half a period switching symmetry is presented. The proposed switching strategy provides a good current tracking capability and minimum switching frequency. The analytical solution may be applied for the B4 converter connected to highly unbalanced grids. The method enables to analyze quickly B4 converter current...
This paper presents a designing and an analysis of a space vector modulation (SVM) algorithm in a fault-tolerant induction motor drive system based on a redundant voltage inverter topology. First, an influence of open-switch failures on inverter voltages modulation is considered. Furthermore, limitations of the post-fault SVM method are specified. To validate the analyzed algorithm, a simulation model...
The three-level active neutral point clamped converter (ANPC) allows to overcame the problem of unequal loss distribution among semiconductor devices that appears in the classical neutral point clamped converter NPC. Another advantage of this power converter is that it can operate under faulty conditions. In this paper the study of the ANPC using a voltage sliding mode controller for a vector modulator...
This paper is about a PV system linked to the electric grid by power electronic converters. The modeling for the converters emulates the association of a DC-DC boost with a two-level power inverter in order to follow the performance of a testing commercial inverter employed on an experimental system. It is used pulse width modulation by sliding mode control associated with space vector modulation...
This paper presents a finite control set model predictive strategy for a three-phase, three-level Neutral-Point-Clamped (NPC) inverters with resistive-inductive load (RL-Load). This strategy allows for fast load current control while keeping the balance of the DC-link capacitor voltages. The system performance with a prediction horizon of one sample time and the dynamic response of the system with...
This paper presents the design of a mechatronic system integrating piezoelectric multi-actuators, which is used to generate low-frequency vibrations to assist the forging process. With the aim of controlling the complete system, modelling using Energetic Macroscopic Representation is performed. A prototype with an electrical system is developed in a short term to validate the design. Finally, the...
This paper presents a three-phase bidirectional DC-AC converter suitable for operating as an interface between an energy storage system (ESS) based on a battery bank and an isolated microgrid with distributed generation. The converter consists of two stages: a DC-DC stage implemented with a bidirectional half-bridge converter that operates on buck or boost mode (during charge or discharge of the ESS,...
An open-end winding induction motor drive is configured by driving the open-end induction motor using two three-phase inverters connected to a common DC source. This configuration can feed three-level voltage to the stator windings. In addition, it can double switching frequency without increasing switching losses in each single inverter by commutating the two inverters alternately. However, the open-end...
This paper examines the issue of staying within the voltage capacity of a fixed bus voltage inverter during increasing magnetization state (MS) of variable flux permanent magnet synchronous machines (VF-PMSMs). MS manipulation using a fast stator id pulse is shown to induce a large voltage even at low speeds. In order to utilize the power conversion capability and improved efficiency regions of VF...
A performance comparison study for two proposed DC-bus voltage balancing algorithms is carried out, with a three-level NPC based permanent magnet synchronous machine (PMSM) drive for the electric vehicle propulsion application. Both the control algorithms are able to keep the two DC-link capacitor voltage variation within a tolerance level with wider range of speed and torque variation of the load...
This paper analyzes the use of pulsating high frequency signal injection for islanding detection purposes. Active islanding detection using high frequency signal injection is an appealing option due to its reduced non-detection zone, reduced cost and ease of implementation. The use of a rotating high frequency signal has been reported and analyzed. However, this method can only be applied to three-phase...
This paper proposes three dynamic voltage restorer (DVR) topologies. Such configurations are able to compensate voltage sags/swells in three-phase four-wire (3P4W) systems under balanced and unbalanced conditions. The proposed systems in this work use two independent dc-links. The complete control system, including the PWM technique, is developed and comparisons between the proposed configurations...
In a weak grid condition, the precise grid impedance estimation is essential to guaranty the high performance current control and power transfer for a grid-connected inverter. This paper proposes a precise estimation method for grid impedance by P-Q variations employing a decoupled injection of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative...
In this paper, the voltage signal injection at the half of the carrier frequency is proposed for sensorless control in a Three Shunt Sensing Inverter (TSSI). As the injection frequency in sensorless control, high frequency is preferred for a rapid angle estimation and small audible noise. However, the maximum sampling frequency for the current reconstruction is limited to the carrier frequency in...
A new space vector modulation (SVM) strategy is proposed for quasi-Z-source indirect matrix converter (QZS-IMC) to reduce common-mode voltage and to ensure a high voltage transfer ratio. QZS-IMC's common-mode voltage is analyzed, and the subdivided sectors are employed to rearrange switching sequence in the inverter stage, which can reduce common-mode voltage and power loss. The proposed modulation...
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