A Robust Digital Control Strategy Using Error Correction Based on the Discrete Lyapunov Theorem

within the medium switching frequency range (6-30 kHz) [9]. For that reason, in this study, the T-type inverter is selected as DC-AC power conversion stage in the UPS.The control techniques play a critical role so as to ensure voltage regulation of UPSs. There are a number of studies proposed in the literature to regulate the output voltage of the UPSs. Some studies proposed linear control techniques like proportional-integral controllers using pulse-width modulation (PWM) [10]-[12], predictive control [13]-[15], multiloop feedback control [11] and repetitive-based controllers [2], [16]. In most of these control techniques, the cascaded control loop (outer and inner) and the modulation stage are required in order to produce the drive signals for the inverter switches.As an alternative to the above control techniques, the deadbeat control (DBC) is used in many power electronics applications. It uses a discrete-time model of the system in the computed control law to assure the controlled variable tracks the reference values in the next switching instant [17], [18]. Simplicity is the main advantage of this control technique and, it can be easily run in digital platforms such as microcontrollers, digital signal processors, FPGAs. Apart from this advantage, the DBC technique brings several benefits such as nearly zero steady-state error, minimum rise, and settling time. These advantages make this control technique attractive for power converters. On the other hand, there are some drawbacks to the DBC technique. For example, the mismatches in the system model result in instability, whereas the delay in the digital control leads to oscillations. [19]. Fortunately, fast digital platforms are available today to facilitate the possibility of implementation.This study mainly focuses on the DBC scheme for a three-phase three-level T-type inverter with output LC filter in UPS applications. The simulation model of the T-type inverter and its control scheme are prepared and simulated in Matlab/Simulink environment. The simulation studies show that the output voltage amplitude and frequency are kept constant under various load types, including linear and nonlinear loads. This paper is divided as follows: in Section II, the mathematical model is presented for the three-phase threelevel T-type inverter connected to the load through the LC filter; in Section III, the DBC is described; in Section IV, the simulation results are presented for the proposed deadbeat

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Performance Degradation of Surface PMSMs with Demagnetization Defect under Predictive Current Control

Verkroost

Druant

Vansompel

et al. 2019

Energies

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To control the current of a surface mounted permanent magnet synchronous machine fed by a two-level voltage source inverter, a large variety of control algorithms exists. Each of these controllers performs differently concerning dynamic performance and control- and voltage quality, but also concerning sensitivity to demagnetization faults. Therefore, this paper investigates the performance degradation of three advanced predictive controllers under a partial demagnetization fault. The three predictive controllers are: finite-set model based predictive control, deadbeat control, and a combination of both previous algorithms. To achieve this goal, the three predictive controllers are first compared under healthy conditions, and afterwards under a partial demagnetization fault. A PI controller is added to the comparison in order to provide a model-independent benchmark. Key performance indicators, obtained from both simulations and experimental results on a 4 kW axial flux permanent magnet synchronous machine with yokeless and segmented armature topology, are introduced to enable a quantification of the performance degradation of the controllers under a demagnetization fault. A general conclusion is that the deadbeat controller shows superior control quality, even under partial demagnetization.

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A Robust Digital Control Strategy Using Error Correction Based on the Discrete Lyapunov Theorem

Cited by 4 publications

References 21 publications

Design and Implementation of a Single-Band Hysteresis Current Controlled H-Bridge Inverter

Design and Implementation of a Single-Band Hysteresis Current Controlled H-Bridge Inverter

Deadbeat Control of a Three-Phase T-type Inverter with Output LC Filter for UPS Applications

Performance Degradation of Surface PMSMs with Demagnetization Defect under Predictive Current Control

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