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CES Transactions on Electrical Machines and Systems
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2096-3564
Published by IEEE Homepage  [229 journals]
  • Content

    • Pages: 1 - 1
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Message from editors

    • Authors: Gaolin Wang;
      Pages: 325 - 326
      Abstract: WITH the depletion of the traditional fossil energy and the increasingly serious problem of global warming, the development and utilization of new energy has gradually become the focus of attention. One of the urgent problems is how to convert new energy into stable and efficient electricity. Therefore, the research on converters have been focused on, including topology structure and control method. In addition, as one of the carriers of electric energy application, the motor system can be optimized in a variety of ways to obtain the maximum utilization of electric energy, such as the improvement of the mechanical structure of the motor and the optimization of the control.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Topological comparison and analysis of medium-voltage and high-power
           direct-linked PV inverter

    • Authors: Xing Zhang;Mingda Wang;Tao Zhao;Wang Mao;Yuhua Hu;Renxian Cao;
      Pages: 327 - 334
      Abstract: Among all the renewable energy sources, the installed capacity of solar power generation is the fastest growing in recent years, so photovoltaic (PV) power generation still has great market potential. Compared with low-power systems, large-scale PV systems are more commercially attractive, because they can reduce the cost of the system per watt. The PV inverters with centralized and string structure have been applied in large-scale PV plant, but it is difficult to further increase the voltage and power levels for a single converter. In addition, the line-frequency isolation transformer requires a large amount of materials and has a large volume and weight. Therefore, it is a current trend for large-scale PV system to increase the voltage and power levels to directly connect to the medium-voltage power grid. Based on this, this paper investigates and compares several topologies of PV inverters without line-frequency transformer, including the MMC structure and the three-phase cascaded H-bridge (CHB) structure, which are able to directly connect to the 35kV medium-voltage power grid, and can not only make the voltage and power levels higher, but also further reduce the cost and volume of the whole system.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Hybrid predictive control with simple linear control based circulating
           current suppression for modular multilevel converters

    • Authors: Yuanxiang Sun;Zhen Li;Zhenbin Zhang;
      Pages: 335 - 341
      Abstract: The modular multilevel converter (MMC) has become a promising topology for widespread power converter applications. However, an evident circulating current flowing between the phases will increase system losses and complicate the heatsink design. This paper proposes a novel hybrid model predictive control method for MMCs. This method utilizes an indirect structure MPC and a sorting algorithm to implement current tracking and capacitor voltages balancing, considerably resulting in reduced calculation burden. In addition, different from the conventional MPC solutions, we add a simple proportional-integral (PI) controller to suppress circulating current through modifying the submodule (SM) inserted number, which is parallel to the MPC loop. This hybrid control solution combines both advantages of MPC and linear control, evidently resulting in improved performance of circulating current. Finally, the MATLAB/Simulink results of an 11-level MMC system verify the effectiveness of the proposed solution.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Analysis of transforming dq impedances of different converters to a common
           reference frame in complex converter networks

    • Authors: Qi Xiao;Paolo Mattavelli;Aram Khodamoradi;Fen Tang;
      Pages: 342 - 350
      Abstract: DQ impedance-based method has been widely used to study the stability of three-phase converter systems. As the dq impedance model of each converter depends on its local dq reference frame, the dq impedance modeling of complex converter networks gets complicated. Because the reference frames of different converters might not fully align, depending on the structure. Thus, in order to find an accurate impedance model of a complex network for stability analysis, converting the impedances of different converters into a common reference frame is required. This paper presents a comprehensive investigation on the transformation of dq impedances to a common reference frame in complex converter networks. Four different methods are introduced and analyzed in a systematic way. Moreover, a rigorous comparison among these approaches is carried out, where the method with the simplest transformation procedure is finally suggested for the modeling of complex converter networks. The performed analysis is verified by injecting two independent small-signal perturbations into the d and the q axis, and doing a point-by-point impedance measurement.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • A review of nonlinear Kalman filter appling to sensorless control for AC
           motor drives

    • Authors: Zhonggang Yin;Fengtao Gao;Yanqing Zhang;Chao Du;Guoyin Li;Xiangdong Sun;
      Pages: 351 - 362
      Abstract: Sensorless control of AC motor drives, which takes the advantages of cost saving, higher reliability, and less hardware, has been developed for several decades. Among the existing speed sensorless control methods, nonlinear Kalman filter-based one has attached widespread attention due to its superb estimation accuracy and inherent resistibility to noise. However, the determination of noise covariance matrix and robustness of model uncertainties are still open issues in practice. A great number of studies try to solve these problems in resent years. This paper reviews the application of extended Kalman filter (EKF), unscented Kalman filter (UKF), and cubature Kalman filter (CKF) in speed sensorless control for AC motor drives. As an iterative algorithm, EKF has advantages in processor implementation. However, EKF suffers from the linearization error and model uncertainties when applying to sensorless control system. This paper presents the predominant improvements of EKF which is also applicative in UKF and CKF mostly.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Robust position observer for sensorless direct voltage control of
           stand-alone ship shaft brushless doubly-fed induction generators

    • Authors: Mohamed G. Hussien;Yi Liu;Wei Xu;
      Pages: 363 - 376
      Abstract: The aim of this paper is to investigate an adaptive sensorless direct voltage control (DVC) strategy for the stand-alone ship shaft brushless doubly-fed induction generators (BDFIGs). The proposed new rotor position observer using the space vector flux relations of BDFIG may achieve the desired voltage control of the power winding (PW) in terms of magnitude and frequency, without any speed/position sensors. The proposed algorithm does not require any additional observers for obtaining the generator speed. The proposed technique can directly achieve the desired DVC based on the estimated rotor position, which may reduce the overall system cost. The stability analysis of the proposed observer is investigated and confirmed with the concept of quadratic Lyapunov function and using the multi-model representation. In addition, the sensitivity analysis of the presented method is confirmed under different issues of parameter uncertainties. Comprehensive results from both simulation and experiments are realized with a prototype wound-rotor BDFIG, which demonstrate the capability and efficacy of the proposed sensorless DVC strategy with good transient behavior under different operating conditions. Furthermore, the analysis confirms the robustness of the proposed observer via the machine parameter changes.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Driving range parametric analysis of electric vehicles driven by interior
           permanent magnet motors considering driving cycles

    • Authors: Le Tian;Lijian Wu;Xiaoyan Huang;Youtong Fang;
      Pages: 377 - 381
      Abstract: This paper presents parametric analysis of driving range of electric vehicles driven by V-type interior permanent magnet motors aiming at maximum driving range, i.e., minimal total energy consumption of the motors over a driving cycle. Influence of design parameters including tooth width, slot depth, split ratio (the ratio of inner diameter to outer diameter of the stator), and V-type magnet angle on the energy consumption of the motors and driving range of electric vehicles over a driving cycle is investigated in detail. The investigation is carried out for two typical driving cycles with different characteristics to represent different conditions: One is high-speed, low-torque cycle - Highway Fuel Economy Test and the other is low-speed, high-torque cycle - Artemis Urban Driving Cycle. It shows that for both driving cycles, the same parameters may have different influence on the energy consumption of the motors, as well as driving range of electric vehicles.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Analysis and modeling of tooth-tip leakage fluxes in a radial-flux
           dual-stator machine with diametrically magnetized cylindrical permanent

    • Authors: Nejat Saed;Shahin Asgari;Mojtaba Mirasalim;
      Pages: 382 - 388
      Abstract: Tooth-tip Leakage flux (TLF) has a major effect on the prediction of air-gap flux distribution and electromagnetic torque in the permanent magnet (PM) machines. Therefore, deriving a model for TLF is necessary for machine design and optimization. Accurate modeling of TLF can lead to fast and precise solutions, which ease the analysis of electromagnetic devices. It also provides the opportunity to increase torque density by more efficient utilization of PM's volume and prevent saturation in machine optimization. This paper presents a method for modeling and analyzing TLFs in a radial-flux dual-stator permanent magnet (DSPM) machine with diametrically magnetized cylindrical permanent magnets (DMCPM) in series and parallel magnetic circuit structures. In this model, some expressions in terms of machine dimensions are derived for the TLF analysis. Finite element method (FEM) is applied to validate the proposed model. Results indicate that the maximum error between the proposed model and FEM is insignificant (less than 6%). Finally, by a prototyped machine the validity of the proposed model was investigated with the experimental tests.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • A novel hybrid seven-level converter for permanent magnet synchronous
           motor driving system based on model predictive control

    • Authors: Yuansheng Hu;Cungang Hu;Pinjia Zhang;Yunlei Zhang;
      Pages: 389 - 396
      Abstract: A novel hybrid three-phase seven-level converter is proposed in the paper. Each phase consists of a four-level bridge and a two-level H bridge, which contains ten switching devices and a floating capacitor. The circuit structure is introduced and working principle of the converter containing 14 commutation paths is analyzed, which is easy to control the floating capacitor voltage. In order to drive permanent magnet synchronous motor (PMSM) with the proposed converter, model predictive control (MPC) strategy is adopted. The control objectives such as controlling the currents of PMSM and capacitor voltages balancing are included in a cost function with two weight factors, which can control the currents of PMSM and balance the capacitor voltages simultaneously. To validate the proposed control scheme, simulations in two cases are carried out by using Matlab/Simulink software. Finally, the feasibility and efficiency in two cases are verified with the experimental test bench based on RT_LAB.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
  • Influence of skewing design for reduction of force ripples in DSL-SynRM
           using 3D FEA

    • Authors: Anusha Vadde;B. Sudha;
      Pages: 397 - 402
      Abstract: Double Sided Linear Synchronous Reluctance Motors (DSL-SynRM) are being increasingly used in high force density applications. The force ripples are one of the major issue in machine which is due to nonlinear nature of current in the machines. This paper focuses on the reduction of force ripples for increasing the force density of the motor. In order to reduce the force ripples, DSL-SynRM with a skewed translator is proposed. The proposed structure is designed and developed by using computational magnetic tools. This concept is effective for reduction of the force ripples and improves the force density of the machine. The proposed design has been reduced the percentage of force ripples by 21.62 %, improved the force density by 10.32 N/mm3 and efficiency by 0.89%.
      PubDate: Dec. 2019
      Issue No: Vol. 3, No. 4 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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