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High power density is required for motors intended for automotive applications. Therefore, interior permanent magnet synchronous motors (IPMSMs) are commonly used in hybrid electric vehicles and electric vehicles. It is known that the characteristics of the magnetic materials are a significant factor with respect to the performance of the IPMSM, and the magnet is particularly important. In addition,...
A mathematical model is proposed for the high-efficiency control law of a permanent-magnet synchronous motor (PMSM) in the stator flux linkage synchronous frame (M-T frame). The mathematical model takes into consideration magnetic saturation and cross-magnetization effects. In taking into consideration magnetic saturation effects, most of the mathematical models in the d-q frame are complex. The M-T...
This paper proposes a control method of permanent-magnet synchronous motor (PMSM) drive system based on direct torque control (DTC) in high speed region. In high speed region, when the magnet flux of the PMSM is relatively weak, maximum torque per flux (MTPF) control is used for wide-speed-range operation. In the DTC-based motor drive system, the reference torque and the reference flux are required...
This paper describes fast analytical model for computation of the switched reluctance machine's (SRM) nonlinear magnetization characteristic and torque lookup table. The flux-tube and the gage-curve methods are used to develop this fast analytical model. Presented model is used for computation of the magnetization characteristic and torque lookup table of three and four-phase SRMs. The simulation...
A hybrid power system placed in Beaufort Sea in order to power supply the offshore oil and gas platforms is investigated in this paper. The proposed microgrid includes various energy sources such as photovoltaic panels, wind turbines, diesel generator as a secondary power source and stationary storage system. Simulation of each component and the proposed topology is discussed with the energy management...
This paper describes mathematical modeling of a novel wound-field synchronous motor self-excited by space harmonics. The torque equation on the dq-reference frame is investigated to clarify the self-excitation mechanism of the proposed motor. It has been analytically explicated how the motor parameters give influences on the self-excited electromagnet torque. Furthermore, the current phase vs. torque...
This paper presents a novel auto-tuning method of inductances for permanent magnet synchronous motor (PMSM). In the proposed method, inductances are measured injecting high frequency current and voltage to the motor at standstill. On the basis of adaptive control, the current control executing inductance tuning is stable and highly accurate up to the high frequency area, though motor parameters are...
Recent years, to replace current source control methods, voltage source control methods such as virtual synchronous generator (VSG) and droop control have been proposed for grid-connected and/or stand-alone inverters. Both methods imitate the behaviors of synchronous generator. With the presence of swing equation, VSG has a virtual inertia, while droop control does not, and the rest of the two control...
This paper presents an average power balancing control technique for the modular multilevel cascaded converter (MMCC) based on single-star bridge cells (SSBC) in the static synchronous compensator (STATCOM) applications. Detailed power flow analyses of the MMCC-SSBC converter, from the bottoem level of individual H-bridge modules, then the middle level of per-phase circuit, to the top level of the...
In the motor drives working group of Cooperative Study Group on Applications of Power Electronics Simulations of IEEJ, standard models for simulation of motor drive systems are discussed. This paper provides a standard motor model of induction motor drive systems with parameters. Parameters of more than 30 induction motors have been gathered, and tendency of the parameters have been also investigated...
This paper describes the output voltage regulation for the islanded mode of microgrid based on inverter with LCL filter. When a microgrid is transferred to the islanded mode, it has to supply the full local load demand without supporting of grid and to operate as a voltage source with an appropriate voltage regulation. Here, if the local loads are unbalanced and nonlinear, then it makes the output...
Sensorless vector control of an interior permanent magnet synchronous motor (IPMSM) has been studied in many papers. The extended electromotive force (EMF) based method is one of the representative systems. We proposed a simplified method which estimates the rotor position using the controlled voltage without using observer. In this paper we have compared these methods through trajectories of poles...
An new network communication system for power electronics controller to transmit the feedback signal from the sensors using FPGA based hardware controller was proposed. Based on RocketI/O network controller, customized Rocket I/O protocol was implemented to achieve high speed feedback communication between two FPGA controller. To compensate the network delay of the feedback signal, communication disturbance...
A multilevel converter topology with common flying capacitors (CFC) was proposed recently. It has the advantage that fewer components are required, thus lower cost and higher power density are possible to be realized. However, due to the common circuit shared among different phases, voltage level skips are easy to be caused, which will make the system suffer surge voltage and could be a threat to...
Recently, the use of permanent magnet (PM) motors has expanded remarkably as a result of improvements in the performance of the rare-earth PM motor. However, it is desirable to reduce the use of rare-earth materials, which are an important aspect of the high-performance PM motor, because of the high cost and the unpredictability involved in procuring such materials. The performance of motors that...
The Modular Multilevel Converter (MMC) with cascaded full bridge cells is available for AC/AC transmission system without transformers in high voltage line. This research applied a Hexagonal MMC (H-MMC) to 3-phase AC-AC back-to-back (BTB) system. The H-MMC has six arm modules with floating capacitors and is required to regulate the input-output power and capacitor voltages by controlling currents...
This study presents a new topology for alternative power sources, namely interleaved boost converter with current ripple reduction (IBC-CRR), which discards electrolytic capacitors to enlarge the life-span of the converter by using current ripple reduction (CRR) technique. The voltage spikes on switches are eliminated resulting of using of low on-resistance (RDS(ON)) MOSFETs to improve efficiency...
As the number of data centers has grown in pace with the burgeoning expansion in information technology (IT), reducing the power consumption of data centers has become an important social challenge. IT equipment is a primary contributor to data center power consumption and, as such, is an area where power conservation is indispensable. Nevertheless, while the efficiency of the power supply modules...
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