The Development of a 20MW PWM Driver for Advanced Fifteen-Phase Propulsion Induction Motors

Abstract

Since the power capacity needed for the propulsion of large ships is very large, a multiphase AC induction propulsion mode is generally adopted to meet the higher requirements of reliability, redundancy and maintainability. This paper gives a detailed description of the development of a 20MW fifteen-phase PWM driver for advanced fifteen-phase propulsion induction motors with a special third-harmonic injection in terms of the main circuit hardware, control system design, experiments, etc. The adoption of the modular design method for the main circuit hardware design can make the enclosed mechanical structure simple and maintainable. It can also avoid the larger switch stresses caused by the multiple turn on of the IGBTs in conventional large-capacity converter systems. The use of the distributed controller design method based on a high-speed fiber-optic ring net for the control system can overcome such disadvantages as the poor reliability and long maintenance times arising from the conventional centralized controller which is designed according to point-to-point communication. Finally, the performance of the 20MW PWM driver is verified by experimentation on a new fifteen-phase induction propulsion motor.

Decoupled PWM Control of a Dual-Inverter Four-Level Five-Phase Drive

“…This topology is aimed at high-power applications where the well -kno wn advantages of multiphase machines and multilevel converters are of importance. OeW drives are particularly interesting for EVs/ HEVs [5] and electric ship propulsion [6,7], where use of two isolated supplies may not represent a problem. The OeW topologies have also been investigated as a means of extending the operating speed range of five-phase permanent magnet synchronous [8] and three-phase induction machine [9] drives.…”

Phase voltage harmonic imbalance in asymmetrical multiphase machines with single neutral point

“…Lower current and power per phase allow use of reduced rating switches, torque ripple is at the higher frequencies, and, above all, fault-tolerant operation is highly desirable in safety critical application [1,2]. Some examples where advantages of the multiphase machines are of particular importance include fault-tolerant remote off-shore wind power generation systems [3,4], increase of the dc link voltage by series connection of the voltage source inverters (VSIs) [5], multi-motor applications [6,7], and electric ship propulsion [8] and generation [9].…”

Brush-DC equivalent control based delta modulation for a PWM inverter-fed nine phase induction machine drive

“…It can be observed from equation (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) that there is a relationship between the magnitude of the torque current and the slip speed. Assuming that the rotor resistance does not change significantly as the machine runs, and that there is a constant air gap flux density in the machine, then there is a constant relating the torque current to the slip speed.…”

“…, (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) In the induction machine, the stator mutually induced voltage is a function of the machine winding self-inductance and the mutual inductance due to the other phases. The inductance values can be calculated using different approaches presented in detail in Appendix C.…”

“…The developed torque equation used in the simulation was determined by substituting the variables in equation (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), by the corresponding values in Table 2 …”