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With the global energy crisis and environmental pollution intensified, the development of new energy has become the consensus of the world. Among them, ocean, which accounts for 70.8% of the Earth's surface area, contains a wide range and considerable storage of renewable energy. Energy flow density of wave energy is large, which is a low-cost energy source that can provide considerable power through...
This paper presents the current application situation of five-phase permanent magnet synchronous motor and control algorithms. The mathematical model is established through the coordinate transformation, meanwhile the linear decoupling equation of PMSM state is also derived, two-vector control algorithm (NTV-SVPWM) and four-vector control algorithm (NFV-SVPWM) are discussed especially. A modified...
This paper proposes a non-symmetrical permanent-magnet linear motor traction system (PMLMTS), in which the primary permanent-magnet linear motor (PMLM) is employed. Four movers are mounted with same phase angles. There are nine legs, including eight independent legs and one common leg. All legs have same normal voltage but different normal currents. The normal current of the common leg is four times...
Sucker Rod Pump is a prevalent industrial solution in artificial lift applications in oil industries. Linear motors are becoming more popular as they are applied in new applications in various fields. Linear motors may be employed in artificial lift systems by placing a linear motor downhole to drive the reciprocating pump directly. This system is intended to extend the application of reciprocating...
This paper provides an experimental discussion on a power hardware-in-the-loop-simulation (P-HILS) system for a medium-voltage, high-power, high-speed synchronous-motor drive. It consists of two identical modular multilevel double-star chopper-cell (DSCC) converters connected in front-to-front (FTF) without ac-link transformer. One DSCC inverter acts as a “real inverter under test,” while the other...
With regard to the pulse width modulation (PWM) of seven-phase motor system if the three-phase space vector pulse width modulation (SVPWM) is simply extended to the seven phase motor system that is the seven phase of the traditional SVPWM it will produce a great harmonic current. In order to restrain the harmonic content of phase current the voltage vector synthesized in the 3rd harmonic subspace...
This paper presents a simple methodology for calculation of the Permanent Magnet Synchronous Machine (PMSM) efficiency map. The presented method requires only the machine nameplate data and allows to a system designer to estimate the efficiency for different operating conditions, such as a different driving cycle in traction applications. The method has been experimentally verified for both large...
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...
Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
A calculation of the high frequency machine capacitances is presented and compared with measured bearing currents of a small outer rotor 2.4 kW-fan PM synchronous motor with a tooth-coil winding. The integrated two-level voltage-source, 16 kHz switching frequency IGBT inverter, operates at Fdc = 540 V DC link voltage. Due to the small size of the motor no circulating bearing currents can occur, but...
The objective of this project is the performance optimization of an electrical drive system, which consists of a two-level Voltage Source Inverter (VSI) and a Permanent Magnet Synchronous Motor (PMSM) with high magnetic anisotropy. To this end, the concept of Synchronous Optimal Modulation (SOPWM) is employed for inverter control and the optimal inverter switching angles are defined for an isotropic...
During the last 2 decades natural gas became a very important source of energy. Consequently liquefaction of such gas became a mandatory process to allow shipping from production fields to customers. Very large liquefaction plants have been built and much more will be built in the next 10 years. The power of such plants is continuously increasing, at the same time environmental restrictions become...
The flux weakening control is significant for the interior permanent magnet synchronous motor to obtain a wide constant power range which is required in the electric vehicle application. A representative flux weakening method is to design an outer voltage loop using the voltage reference and the voltage limit. If the characteristic current of the motor is less than the current limit, the deep flux...
There is ripples in the DC bus voltage of the electrolytic capacitor-less air condition motor system because the film capacitor is not big enough to store plenty of energy, which will cause a motor voltage offset and go further causing beat phenomenon in the motor current and the torque. Firstly, the reason of the beat phenomenon in the current and the torque is analyzed mathematically. Furthermore,...
This paper describes the soft start and grid connection control strategies for high power synchronous compensator fed by low-voltage load-commutated inverters (LCI). In the start-up stage, field weakening method is used to make the motor start stably, and the back electromotive force (EMF) basically remain stable within the LCI withstand voltage at the same time. When the motor speed up to above the...
The efficiency-oriented control strategies are very important to obtain high-efficiency performance of permanentmagnet synchronous motor (PMSM) drive systems. This paper proposes a novel analytic system loss model of PMSM drive system which can consider about both losses of PMSM and power converter losses. The losses of PMSM consist of two parts: stator iron losses and stator copper losses which...
A Full Redundant Drive consists of two independent drive units each supplying the stator windings of a dual winding synchronous motor. The implementation of a Full Redundant Drive on the Hardware in Loop Simulation platform provides faster and an economical solution for testing the drive control software without any compromise in controller transient and steady state response. This paper describes...
For an inverter drive induction motor control system, a typical problem encountered is the nonlinear voltage gain caused by the non ideal characteristics of the power inverter. The switch dead time will introduce waveform distortion and fundamental voltage drop to the system. If not compensated, such distortions will introduce harmonic components which will cause additional loss in the induction machine...
This paper presents a simple method for calculating the efficiency map of a Permanent Magnet Synchronous Machine (PMSM) for traction applications. The calculation uses motor nameplate data only. This is useful in e.g. design phase of an electric vehicle where the efficiency map is required to estimate the range based on a given driving cycle. The method is experimentally validated with a 100kW, 191...
Electric Submersible Pumps are a widespread industrial solution for artificial lift applications in oil industries. Linear motors are becoming more popular as they are applied for new applications in various fields. Integrated Drive-Motor technology shows many promising advantages. In this paper, a system which combines these three technologies for marginal oil wells application is discussed. This...
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