Combining the principles of variable structure, direct torque control, and space vector modulation for induction motor fed by matrix converter

Abstract

Abstract. This paper presents a novel direct torque control method for an induction motor fed by a matrix converter using the variable-structure sliding mode scheme with the reaching law, in which combined with the space-vector pulse width modulation to ensure a high-performance operation, both in steady state and under transient conditions. The novel variable-structure controllers are designed to provide the fast and accurate torque and flux control which replace the traditional hysteresis comparators. Some experimental results are shown to prove the accuracy and low-ripple operation of the proposed algorithm.

PI observer stability and application in an induction motor control system

“…It is derived from (8), that the number of rows of C ξ equals q and is the lesser of its dimensions; similarly, we derive from (9) and (10), that the number of columns of K ξ equals q and is the lesser of its dimensions, therefore:…”

“…Therefore the PI observer, described with (2), is always unstable and the application of proposed modifications is necessary for its proper operation. The basis for the observer design is the mathematical model of an induction motor assuming sinusoidal flux distribution in the air gap, the linear and lossless magnetic core and one rotor circuit [8], described in stationary Cartesian α−β coordinate system using dimensionless quantities. The electrical angular speed ω is treated as a parameter and it is reconstructed in the observer by the adaptation mechanism described in [9,10].…”

“…where R s , R r , L s , L r and L m -the parameters of the equivalent circuit of the motor [8]. The matrix J and the parameter γ are defined as:…”

Parameter selection of an adaptive PI state observer for an induction motor

“…An induction motor can be described in the steady Cartesian coordinate system α − β with four differential equations [12,13]:…”

Power electronic systems as a crucial part of Smart Grid infrastructure - a survey

“…Curves of the daily loading on the Polish EPS: ignoring the additional power for charging EVs, curve (1), are visible in Fig. 25; taking into account this power throughout the day with a coincidence factor of 0.5, curve (2); and with charging power restricted by time through an EPS operator within the hours, e.g., 21:30 to 7:30 it shows that by introducing certain procedures by EPS operator, in grids with V2G or V2H technology it would allow a balancing of the daily load curve [65][66][67][68][69][70][71]. Additionally, a systematic solution in the form of differential tariff calculations for consumed or uploaded energy in relation to the time of day might lead to both V2G and V2H technologies becoming additional instruments in the hands of the EPS operator, instruments leading to an increase in the reliability of the power system, mainly at the level of low voltage grids.…”