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This paper introduces a new method to stabilize synchronous reluctance motors (SynRMs) driven by efficiency optimized V/f control utilizing optimized flux. Efficiency optimized V/f driven SynRMs are prone to instabilities. Specifically, it becomes unstable for either fast ramp acceleration or large load disturbances. For example, in an efficiency optimized V/f control scheme, flux is reduced under...
This paper will explain the dynamics of slow voltage instability on large power systems at a basic and intuitive level. This paper will outline the voltage instability phenomenon and leave the specific details for individual investigation. Slow Voltage Instability is a phenomenon which occurs over several minutes to an hour; where as Transient Voltage Collapse occurs over several seconds. Understanding...
Permanent Magnet Synchronous Motors (PMSMs) are prone to instability when operated open loop in variable speed drives. This paper presents a real-time control strategy based on Adaptive Neural Networks (ANN) for efficiency optimisation of a previously reported drive system incorporating a high-field PMSM. Stability constraints of the drive system are used by the proposed controller to maintain both...
Load modelling is one of the major issues in voltage stability analysis. It greatly impacts the result of the study and has a significant effect on the stability regions. This paper examines the validity of static models for induction motors, proposed for static voltage stability studies, in their different operating conditions. It has been shown that motor operating condition and mechanical load,...
This paper introduces a direct power control (DPC) method with narrowband disturbance rejection capability for the grid-connected doubly fed induction generator (DFIG). The method is suited for variable speed operation of DFIG, especially in wind energy conversion systems connected to weak networks where voltage unbalance is common. The control framework is based on the linear quadratic regulator...
Knowledge of the load composition and characteristics, such as corresponding PV curves, are necessary tools for the voltage stability analysis. This paper investigates small industrial induction motors that are operated under different mechanical load conditions. Experimental tests were performed to determine the system's PV characteristics and assess the voltage stability under different loading...
Many developing countries like India have installed large number of constant speed wind turbine generators (WTGs) as they are robust and economical. Most of the countries have their own grid codes (rules and regulations) to integrate WTGs into the utility grid. One of the primary grid code for WTGs is low voltage ride through (LVRT) capability. The regulations of grid integration are likely to make...
This paper investigates stability of a drive system incorporating a high-field PM synchronous motor with the aim of identifying a real-time stability index by means of an algorithm based on the Lyapunov method. Results from computer simulation show that the first principal minor (MINR1) of the Lyapunov function has a distinct sign change in the region of interest. Such an important finding makes it...
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