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This paper presents the soft connection between two micro-hydro units forming a mini-grid system. It describes the operation and the design of the induction generator controller (IGC), used for the power balancing at varying consumers load as required for standalone micro-hydro generators and the synchronizer unit, used for the mini-grid interconnection. Three phase induction motors are used as single...
Starting toque is computed based on two-dimensional (2-D) FEM with a field-circuit coupled analysis. It is discussed that the starting performance of three-phase capacitor motor is better than that of conventional induction motor, in particular, for the operating condition with starting capacitor. The results of calculation are compared to tested values, and it is verified that this new type motor...
This paper presents a simple and low cost single-phase to three-phase cycloconverter topology for driving an induction motor with a single-phase ac supply. Only seven naturally communicated thyristors and one phase balancer capacitor are employed, so the resulting cycloconverter-motor drive system is cheap and compact. Using discrete hopping frequency technique, a single-phase to three-phase modulation...
For three-level neutral point clamped (NPC) back-to-back converter, the inductor in grid side and capacitors in dc-bus are the most important components, which not only influence system performance but also determine the design of system controllers. This paper provides an optimized design method for these energy storage components according to the specific control method of the system. Experimental...
In recent years, much has been written about motors concerning efficiency, vibration, and resonance conditions as they relate to the American Petroleum Institute's (API) standard 541 and motor diagnostics. Most of these papers and articles assume that the reader has significant knowledge of motor theory and operation. However, this assumption is overly optimistic, considering that only a few colleges...
This paper first investigates a local voltage and reactive power control (local control) in a distribution system based on local control of on-load tap-changer (OLTC), substation capacitors, and feeder capacitors, and how the presence of induction machine based distributed generation (DG) affects it. A proper coordination among those available voltage and reactive power control equipment to minimize...
This paper describes the development and performance of the inverter for a 2 MW, 20000 RPM cage induction motor using capacitors to excite the motor over the operating range so that the drive behaves as a load commutated inverter. The motor is directly coupled to a centrifugal compressor and the shaft system runs on four magnetic bearings. The development of the motor, compressor, bearings and the...
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