A Review on Direct Power Control of Pulsewidth Modulation Converters

Starting from the principle of instantaneous power theory, this article explores various direct control (DPC) strategies for three-phase two-level pulsewidth modulation (PWM) converters. After summarizing fundamental formula PWM rectifiers, studies operating conventional table-based approach and its related improvements. It further looks into advanced counterparts employing space vector different nonlinear strategies. The emphasis is put on prevailing predictive DPC. Besides, voltage-sensorless robust DPC methods based virtual flux concept state observer or estimator are investigated. Critical issues, including sample delay, constant switching frequency, duty cycle optimization, objective function, unbalanced operation examined.