A survey of real-time power-loss minimizers for induction motors

Abstract

This paper presents a survey of available techniques for minimizing power losses and input power of induction motors. The presented techniques serve different induction motor applications, including electric ship propulsion systems. Realtime techniques presented here are divided into three main categories: model-based methods that use the induction motor model, physics-based methods that search for the minimum power loss regardless of the motor model or parameters, and hybrid methods that combine both approaches. Definitions, comparisons, and details about these methods are presented. To compare model-based and physics-based methods in a propulsion application, simulations of a model-based technique and another physics-based technique are also presented.

A comparative study of an exponential adaptive perturb and observe algorithm and ripple correlation control for real-time optimization

“…Known techniques including perturb and observe (P&O) algorithms [1], adaptive P&O (APO), and ripple correlation control (RCC) [2]. These are utilized in several applications including maximum power point tracking (MPPT) of photovoltaic (PV) systems, [3], loss minimization in machines [4], and impedance matching [5], among others. While conventional P&O drives to the optimum by perturbing the system and moving the control variable toward the optimum with fixed step size, APO employs adaptive step size to increase tracking speed and reduce steadystate oscillations.…”

Loss Minimization Control of Dual Three‐Phase Linear Induction Motor with System‐Level Loss Model

“…At present, field-oriented control (FOC) strategy is still widely used, due to its excellent dynamic response obtained by maintaining a large excitation current. However, at the same time it also pays a price of high loss under non-rated working conditions [1,2]. For the balance of dynamic performance and efficiency, LMC strategy is usually switched after using FOC to reach a steady state.…”

“…With phase increases, the inverter loss increase with number of switching devices, so both the inverter and motor losses should be considered in the LMC strategy for multi-phase motor drive systems. Many LMC strategies for rotating induction motors (RIM) have been proposed [1][2][3][4][5][6][7]. Researches [3], [5], [6] each proposed a system-level RIM loss model and corresponding control strategy, adding inverter losses, DC bus losses and filter circuit losses to the model.…”

Simple dynamic loss-minimizing flux level control of field-orientation induction motor drives

“…However, in part-load operation, the efficiency of the induction machine dramatically decreases when the flux is kept at the nominal level. To address this issue different strategies have been developed in the past to increase the efficiency of the induction machine in a large operation range [1]. The main idea of these methods is to choose an appropriate value for the rotor flux depending on the machine load in a stationary state of the machine.…”