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The parallel three-phase voltage source inverters have been widely used to raise system power rating. However, the zero-sequence circulating current can be generated according to switching method in the direct connection scheme. Zero-sequence circulating current not only distorts current but also reduces system reliability and efficiency. In this paper, model predictive control scheme is proposed...
Water pumping system with wind turbine can not only effectively use wind energy, but also solve the problem of water supply and irrigation in the remote areas. In order to improve efficiency as well as reliability of wind turbine and adjust the speed of motor smoothly and quickly under the condition of wind speed changes, a variable frequency vector control method for three-phase asynchronous motor...
This paper assesses the use of a modified three phase VSI topology with additional switches (H8) together with suitable modulation techniques as a mean for common-mode voltage reduction in electric drives with the aim of mitigating the onset of harmful bearing currents. Bearing currents in inverter-fed motors are related to the high dv/dt variation, induced at the motor terminals by the converters...
In order to improve the efficiency, we should know the loss characteristics of inverter-fed induction motors. We first have to accurately measure the total motor losses, and then obtain each loss component by reasonably separate the total motor losses. In this paper, the total losses of a 5.5 kW, a 22 kW, a 30 kW, a 37 kW, a 45 kW and a 55 kW induction motors under sinusoidal supply and PWM inverter...
In this paper, a dual parallel connected brushless direct current (BLDC) motors drive system fed by a single inverter is presented and the control method for stable operation in electric vehicles (EVs) application is proposed. To obtain the stability of such a system, both motors should always be respect the synchronism even if they have different load torque. The proposed control method is based...
The open-ended winding configuration allows feeding an electric motor from two sides. If one of them is connected to an inverter closed on a floating capacitor, operating as an active power filter, it is possible to obtain several benefits over the traditional configuration, such as an extended field weakening speed range and a lower current ripple. However, the additional converter causes switching...
In this paper, we investigate the variation in characteristics of variable speed induction motors fed by inverters with grades of core materials used for stators and rotors from both results of measurement and finite element analysis. Identical shaped stator/rotor cores are manufactured by using several kinds of electrical steel sheets from low to high grades. Then, the characteristics of these motors...
In this paper we present modifications in the sphere decoder initially introduced in [1] and modified in [2] that allow for its implementation in transient operation. By investigating the geometry of the integer problem underlying direct model predictive control (MPC), a new sphere that guarantees feasibility and includes a significant smaller number of candidate solutions is computed. In a first...
Droop control is generally used to realize power sharing without communication lines. VSG (Virtual Synchronous Generator) is a control method that mimics both steady-state droop and dynamic characteristic of SG (Synchronous Generator) to enhance inertia of microgrid. In this paper, the comparison of different damping effect forms in VSG control is given firstly to draw conclusions: For the aspect...
In this paper a prototype brushless doubly-fed reluctance machine is investigated which is aimed a meeting commercial machine performance figures. The machine has 4 and 8 pole 3-phase stator windings and a 6 pole radially-laminated ducted rotor. The machine is investigated using finite element analysis (FEA), static torque tests with DC current excitation, a MATLAB/Simulink model, and experimentally...
This paper proposes a compensation method for precise position-sensorless control using high-frequency pulsating voltage injection and the criterion for applicability of the proposed compensation method is discussed. Theoretical background of the proposed 3-dimensional compensation table as well as the implementation method is described and it is disclosed that the real rotor position and the convergent...
In this work it is presented a two-phase open-end winding induction motor (IM) driven by an improved current source inverter (CSI). The proposed inverter has independent full quadrant operation, lower DC-link current value, high magnetics power density, 25% more efficient and high AC output voltage waveform quality compared to conventional CSI solutions. A back-to-back AC-DC-AC current source converter...
A large electrolytic capacitor is always used to provide stable DC-link voltage in single-phase to three-phase power converter. However, the large electrolytic capacitor occupies a large volume and has a short lifetime as to the home appliances. And additional PFC circuit is needed to correct the grid current. In order to settle these issues, an electrolytic capacitor-less converter system is studied...
Finite control set model predictive control (FCS-MPC) has become very popular form of predictive control among the technical society. Thank to its flexibility and well understood and simple structure, it is well suited for control of ac drives. It represents very interesting alternative for conventional control schemes based on cascade structures with PI controllers. The substantial advantage of MPC...
This paper presents the use of a novel method dealing with mathematical morphology to de-noise spectral contents. This approach is based on two fundamental operators which are dilation and erosion. This type of filter does not need a huge computing time because the operations involved are simple. The goal of this filter in the application considered in this paper is to de-noise the spectrum of the...
The common-mode voltage (CMV) could cause severe hazards to the induction machine winding insulation and bearings, reducing the machine lifetime. This paper proposes an improved predictive torque control (PTC) method with CMV reduction strategy which cost little and much smaller than traditional filter method. A simulation based on SIMULINK is analyzed which verify the effectiveness of the proposed...
Microgrids with a high share of renewables may become the keystone of the new energy transition. With the present inverters interfacing the various DERs (Distributed Energy Resources) to microgrids, the stability of such power systems is threatened if the share of renewables increases. In this paper a robust solution to solve this problem is presented. The proposed solution is based on the concept...
Synchronverters are inverters that mimic the behavior of synchronous generators. In this paper, we propose modifications to the synchronverter algorithm to improve its stability and performance. The proposed modifications are implemented in software and do not require any changes in the inverter hardware. The first two modifications concern the control of the virtual field current in the synchronverter...
Based on double PWM structure, this paper analyzes the energy relationship between each part of the system according to the system energy flow in balanced energy state and unbalanced energy state and builds the energy mathematic model of double PWM. In order to solve the problems of DC bus voltage fluctuation and the mismatch in system output power and the motor power caused by the imbalance between...
In this paper a Model Predictive Control (MPC) was applied to the flux and torque control of a Synchronous Reluctance Motor, SynRM. The behavior of the controller was analyzed based on model's simulations performed in Matlab/Simulink Software. From the results, it was verified that the controller has good performance. The SynRM can reach the speed reference value controlling simultaneously flux and...
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