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Öğe Hysteresis Current Control of Buck-Boost Non-Isolated Onboard Charger for Electric Vehicles(IEEE Computer Society, 2023) Komurcugil, H.; Guler, N.; Bayhan, S.; Gulbudak, O.This paper proposes a hysteresis current control (HCC) method for a single-inductor buck-boost non-isolated onboard charger for electric vehicles. The charger is capable of working both in the boost and buck modes. The proposed HCC relies on the buck-boost inductor current and its reference which is generated using a proportional-resonant (PR) controller using grid current error. The reference current generated by PR controller is modified to suppress the oscillations in the inductor currents. An active damping by using a virtual resistor connected in series to filter inductor is used which does not require an additional sensor. A proportional-integral (PI) controller is used to generate the amplitude of grid current reference, which is utilized in constant current (CC) and constant voltage (CV) modes. The effectiveness of the proposed control strategy as well as the control method, is investigated by simulation studies by considering two different battery voltage levels (48V and 350V). The results show that the proposed method is able to charge the battery in CV and CC modes. Moreover, the grid current is maintained in unity power factor at a reasonably low total harmonic distortion (THD) which is smaller than the limits recognized by international standards. © 2023 IEEE.Öğe Model Predictive Sliding Surface Control of Induction Motor fed by Direct Matrix Converter(Institute of Electrical and Electronics Engineers Inc., 2022) Gulbudak, O.; Gokdag, M.; Komurcugil, H.This paper presents a novel induction motor control strategy for a direct matrix converter. The proposed method consists of two cascaded-control blocks: the stator current control block and the supply current control block. The stator current control block uses the sliding mode control stability term to formulate the objective function. The composed objective function includes the stability expression to regulate the motor speed, torque, and stator current. The second control block contains the predictive active damping method to improve supply current quality. In grid-connected converters, the supply current may suffer from distorted harmonics. To overcome this problem, a damping current is injected into the reference signal. The proposed method offers a reliable motor operation and system performance under steady-state and transient conditions. The simulation works verify the mathematical concept. The simulation results demonstrate that the proposed control method can regulate the motor dynamics while drawing the sinusoidal supply current. © 2022 IEEEÖğe Model Predictive Sliding Surface Control of Voltage Source Inverter(Institute of Electrical and Electronics Engineers Inc., 2022) Gulbudak, O.; Gokdag, M.; Komurcugil, H.This paper presents the model predictive sliding surface control strategy to control the voltage source inverter. The proposed control method benefits from the sliding mode control stability rule to shape the objective function of the optimization problem. The objective function is tailored such that the asymptotic stability criterion is used during the exploration of the optimum control input. The conventional model predictive control method is an effective control routine to handle multiple control goals. However, it can cause closed-loop instability in case of poor selection of the weighting factors or cost function. Due to this unfavorable characteristic of the conventional model predictive control method, the sliding mode control stability criterion is used as a control objective. The proposed objective function formulation guarantees the closed-loop stability regardless of the converter operation points such as power level. The proposed method does not require the weighting factors, which are usually necessary for the applications where the objective function is formed by two or more control goals, thus the system stability is improved. The proposed method is validated by the simulation works, and the results prove the effectiveness of the proposed control method. © 2022 IEEEÖğe Sliding Mode Current Control Strategy for Nine-Switch Converter(Institute of Electrical and Electronics Engineers Inc., 2021) Gulbudak, O.; Gokdag, M.; Komurcugil, H.This paper proposes a sliding mode control strategy for regulating dual-load fed by a nine-switch converter. The nine-switch converter consists of two three-phase output terminals, and the nine-switch converter can control dual-loads. The nine-switch converter contains fewer switching devices compared to the two-parallel voltage-source inverters. The nines witch converter offers a more compact ac-drive system where multiple load control is required regarding power stage weight and size. Nevertheless, attaining a fully independent control for individual load is a challenging task. The poor closed-loop design causes an unpleasant circulating current between separate load stages. Therefore, the possibility of the interaction between different load stages is the primary closed-loop design consideration. This study proposes the sliding mode control to obtain a reliable energy conversion operation method for a dual output nine-switch converter. Sliding mode control methodology is comprehensively explained, and solid design steps are provided. The simulation work verifies the theoretical framework of the designed sliding mode controller. The performed simulation works demonstrate that multiple ac loads are well regulated by the proposed control method. © 2021 IEEE.
