A Kalman Filter based Predictive Direct Power Control Scheme to Mitigate Source Voltage Distortions in PWM Rectifiers

Abstract

In this paper, a predictive direct power control (DPC) method based on a Kalman filter is presented for three-phase pulse-width modulation (PWM) rectifiers to improve the performance of rectifiers with source voltages that are distorted with harmonic components. This method can eliminate the most significant harmonic components of the source voltage using a Kalman filter algorithm. In the process of predicting the future real and reactive power to select an optimal voltage vector in the predictive DPC, the proposed method utilizes source voltages filtered by a Kalman filter, which can mitigate the adverse effects of distorted source voltages on control performance. As a result, the quality of the source currents synthesized using the PWM rectifier is improved, and the total harmonic distortion (THD) values are reduced, even under distorted source voltages.

Direct Power Control Strategy of PWM Rectifier Based on Improved Virtual Flux-Linkage Observer

“…When the DPC strategy of three-phase PWM rectifier is adopted, the instantaneous power estimation should be made [14,[17][18][19]25]. To simplify the complex coordinate transformation, the instantaneous power of DPC system should always be estimated in stationary coordinate system.…”

“…Hereinto, direct power control (DPC) strategy has become one of the hot research topics in recent years, because of its fast dynamic response, simple structure, and high power factor, and so on [8,11,12,14,[16][17][18]. In general station, the control system of PWM rectifier contains more sensors and complex detection device, which not only increases the volume of the system device and improves the system cost, but also reduces the system reliability of three-phase PWM rectifier.…”

“…The AC current and DC voltage sensors play a crucial role in ensuring the control performance of three-phase PWM rectifier system. Even in the DPC control system of three-phase PWM rectifier, the incoming line AC current and the DC side voltage are also necessary to calculate instantaneous power variables [2,8,11,12,14,19]. And then, the two sensors are generally not to be omitted in actual application.…”

“…With the development of power electronics and control theory, in order to improve the control performance and reduce system cost and harmonics, numerous modern control strategies have been studied and applied in an attempt to the control system of three-phase PWM rectifier [9][10][11][12][13][14][15]. Hereinto, direct power control (DPC) strategy has become one of the hot research topics in recent years, because of its fast dynamic response, simple structure, and high power factor, and so on [8,11,12,14,[16][17][18].…”