Implementation of Optimization-Based PI Controller Tuning for Non-Ideal Differential Boost Inverter
01 Jan 2021-IEEE Access (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 9, pp 58677-58688
TL;DR: In this paper, a closed-loop non-ideal differential boost inverter (DBI) employing a PI controller is proposed to change a voltage source inverter's traditional behavior, which generates lesser output voltage with higher THD.
Abstract: The demand for renewable energy to sustain today’s vulnerability towards depleting fossil fuels is a crucial agenda for research. Various inverter topologies have been proposed to convert renewable sources into a usable form. But output THD, additional filtering components at line frequency (leading to bulky circuitry), lower efficiency, etc., are some of the limitations faced in all those topologies. This paper aims to change a voltage source inverter’s traditional behavior, which generates lesser output voltage with higher THD. The paper proposes a closed-loop non-ideal differential boost inverter (DBI) employing a PI controller. The optimization techniques such as, genetic algorithm (GA) and bacterial foraging optimization algorithm (BFOA) are incorporated to accentuate the PI controller’s performance to produce a better response during line and load disturbance conditions with reduced THD. DBI performance is evaluated on a laboratory prototype with different loading conditions. A comparison between the algorithms and the previous topologies from the literature survey has also been provided to validate this research’s claims. This paper’s required simulation study is carried out using MATLAB, and real-time validation is carried out using dSPACE 1104 with sampling time of one $\mu \text{s}$ .
Citations
More filters
20 Mar 2022
TL;DR: In this article , the isolated three-phase differential flyback inverter (TDFI) was proposed to provide ripple-free input DC current considering a small input film capacitor, which mitigate the requirement for bulky electrolytic capacitor at the input DC side and enhances its reliability and lifetime.
Abstract: DC-AC inverters with voltage boosting capability are widely utilized in many applications for power conversion requirements especially for low/medium PV applications. In this paper, performance evaluation and parameters design of the isolated three-phase differential flyback inverter (TDFI) is presented. The proposed TDFI draws a ripple-free input DC current considering a small input film capacitor, which mitigate the requirement for bulky electrolytic capacitor at the input DC side and enhances its reliability and lifetime. In addition, the TDFI offers number of merits such as; reduced passive and switching components, compact size, voltage boosting-bucking property, and enhanced footprint. Moreover, cascaded low-pass filter (LPF) is used for second-order harmonic elimination (SOHE). The proposed SOHE strategy improves the grid currents THD to meet the harmonic standard limits. In addition, SOHE eliminates the third order harmonic component from the input current, which allows a ripple-free input DC current for grid integrated solar PV applications. The single carrier based control scheme of the proposed TDFI has been experimentally verified at 1.6 kW, 200 W, and 50 kHz switching frequency.
1 citations
TL;DR: In this article , the authors proposed a DC-DC converter based on an isolated single-ended primary inductor converter (SEPIC) and isolated Ćuk converter to enable simultaneous charging of batteries of low and medium-power EVs.
Abstract: The use of electric vehicles (EVs) has gained traction in recent years. With the widespread use of EVs in the future, the waiting time before charging will be high due to the use of slow chargers in developing countries. This work proposes a novel DC-DC converter based on an isolated single-ended primary inductor converter (SEPIC) and isolated Ćuk converter to enable simultaneous charging of batteries of low- and medium-power EVs. The proposed converter operates without spikes in input and output currents, even during a sudden source disturbance. It can charge one battery at the output voltage level and simultaneously charge two batteries at half the output voltage. Simulation results for open-loop and closed-loop operations are provided to validate the converter operation and the simplicity of control. The proposed converter operation has been experimentally validated using a scaled-down prototype by charging one 48 V lithium-ion battery and then simultaneously charging two 24 V lithium-ion batteries. The converter's response is provided to present the novelty and advantages of the proposed converter. The proposed converter uses fewer switches, diodes, inductors, and capacitors. The size of the system is reduced due to the high switching frequency operation of SiC devices. A low-side gate driver is sufficient for driving the MOSFET, and the control is simple. The proposed converter offers a new and simple converter to charge multiple low- and medium-power EV batteries of different ratings simultaneously with a low component count.
DOI•
25 Nov 2021
TL;DR: In this article, an optimal quick-response variable structure control with a single-phase sine-wave inverter application is proposed, which keeps harmonic distortion as low as possible under various conditions of loading.
Abstract: This paper puts forward an optimal quick-response variable structure control with a single-phase sine-wave inverter application, which keeps harmonic distortion as low as possible under various conditions of loading. Our proposed solution gives an improvement in architecture in which a quick-response variable structure control (QRVSC) is combined with a brain storm optimization (BSO) algorithm. Notwithstanding the intrinsic resilience of a typical VSC with respect to changes in plant parameters and loading disruptions, the system state convergence towards zero normally proceeds at an infinitely long-time asymptotically, and chattering behavior frequently takes place. The QRVSC for ensuring speedy limited-time convergence with the system state to the balancing point is devised, whilst the BSO will be employed to appropriately regulate the parametric gains in the QRVSC for the elimination of chattering phenomena. From the mix of both a QRVSC together with a BSO, a low total harmonic distortion (THD) as well as a high dynamic response across different types of loading is generated by a closed-loop inverter. The proposed solution is implemented on a practicable single-phase sine-wave inverter under the control of a TI DSP (Texas Instruments Digital Signal Processor). It has experimentally shown the simulation findings as well as the mathematical theoretical analysis, displaying that both quick transient reaction as well as stable performance could be obtained. The proposed solution successfully inhibits voltage harmonics in compliance with IEEE 519-2014’s stringent standard of limiting THD values to less than 5%.
TL;DR: In this article , the authors presented the mix (AC-DC) charging station (CS) integrated with the PV array and the smart distribution grid, where the control strategy used for the CS is the immune feedback-based adaptive (IFA) control technique.
Abstract: The adoption of electrical vehicles (EVs) is nowadays a center of attraction, which reduces the carbon footprint and adds to the economic growth of a country. However, providing a proper charging facility to the customers is still a challenging task. This paper presents the mix (AC-DC) charging station (CS) integrated with the PV array and the smart distribution grid. The acceleration of the EV causes the power quality burden on the grid and this can be taken care of by using advanced adaptive controls. In this paper, the control strategy used for the CS is the immune feedback-based adaptive (IFA) control technique. It reduces the ripples in the fundamental load current extraction under steady-state and produces fast response under dynamic conditions and helps to synchronize CS with the grid. The multi-functional capabilities of the CS are presented with different voltage levels DC fast off-board chargers and AC onboard slow chargers. Moreover, the Rao optimization technique is utilized to select the gains for the cascaded proportional-integral (PI) controllers which are used to regulate the DC bus voltage and battery charging/discharging currents. The optimized fitness values of integral time square error (ITSE) by using Rao1, Rao2, and Rao3 techniques are 297.341, 285.023, and 282.924 respectively. The simulated and test results depict the efficacy of the CS. Moreover, the mixed charging facilities with multi DC fast chargers avoid the rush and burden on the grid, which reduces the power outage across the load and rapidly rising energy cost.
References
More filters
TL;DR: In this article, the authors proposed a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter, which is intended to be used in uninterruptible power supply and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed.
Abstract: This paper proposes a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter. The main attribute of the new inverter topology is the fact that it generates an AC output voltage larger than the DC input one, depending on the instantaneous duty cycle. This property is not found in the classical VSI, which produces an AC output instantaneous voltage always lower than the DC input one. For the purpose of optimizing the boost inverter dynamics, while ensuring correct operation in any working condition, a sliding mode controller is proposed. The main advantage of the sliding mode control over the classical control schemes is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state response in the ideal case. Operation, analysis, control strategy, and experimental results are included in this paper. The new inverter is intended to be used in uninterruptible power supply (UPS) and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed, with no need of a second power conversion stage.
685 citations
TL;DR: In this paper, a GA optimization technique is applied to determine the switching angles for a cascaded multilevel inverter which eliminates specified higher order harmonics while maintaining the required fundamental voltage.
Abstract: In this letter, a genetic algorithm (GA) optimization technique is applied to determine the switching angles for a cascaded multilevel inverter which eliminates specified higher order harmonics while maintaining the required fundamental voltage. This technique can be applied to multilevel inverters with any number of levels. As an example, in this paper a seven-level inverter is considered, and the optimum switching angles are calculated offline to eliminate the fifth and seventh harmonics. These angles are then used in an experimental setup to validate the results.
399 citations
TL;DR: In this paper, the inverse Watkins-Johnson (IWJ) topology is proposed to achieve robust electromagnetic interference noise immunity, which is achieved by allowing shoot through of the inverter leg switches.
Abstract: A Z-source inverter (ZSI) uses an L-C impedance network between the source and the voltage source inverter (VSI). It has the property of stepping down or stepping up the input voltage, as a result, the output can be either higher or lower than the input voltage as per requirement. This topology also possesses robust electromagnetic interference noise immunity, which is achieved by allowing shoot through of the inverter leg switches. This letter proposes an inverter circuit based on the inverse Watkins-Johnson (IWJ) topology that can achieve similar advantages as that of a ZSI. The proposed circuit requires two switches and one pair of an LC filter apart from the VSI. The systematic development of this inverter topology is described starting from the basic IWJ circuit. Steady-state analysis and implementation of the proposed topology are also described. The pulse width modulation control strategy of the inverter is explained. An experimental prototype is used to validate the proposed circuit.
124 citations
TL;DR: In this paper, a single-phase grid-connected fuel cell (FC) system with battery-based energy storage and a dc-dc bidirectional converter is proposed to support the slow dynamics of the FC.
Abstract: In this paper, the boost-inverter topology is used as a building block for a single-phase grid-connected fuel cell (FC) system offering low cost and compactness. In addition, the proposed system incorporates battery-based energy storage and a dc-dc bidirectional converter to support the slow dynamics of the FC. The single-phase boost inverter is voltage-mode controlled and the dc-dc bidirectional converter is current-mode controlled. The low-frequency current ripple is supplied by the battery which minimizes the effects of such ripple being drawn directly from the FC itself. Moreover, this system can operate either in a grid-connected or stand-alone mode. In the grid-connected mode, the boost inverter is able to control the active (P) and reactive (Q) powers using an algorithm based on a second-order generalized integrator which provides a fast signal conditioning for single-phase systems. Design guidelines, simulation, and experimental results taken from a laboratory prototype are presented to confirm the performance of the proposed system.
124 citations
TL;DR: In this article, the boost-inverter topology that achieves both boosting and inversion functions in a single stage is used to develop an FC-based energy system that offers high conversion efficiency, low-cost, and compactness.
Abstract: When low-voltage unregulated fuel-cell (FC) output is conditioned to generate ac power, two stages are required: a boost stage and an inversion one. In this paper, the boost-inverter topology that achieves both boosting and inversion functions in a single stage is used to develop an FC-based energy system that offers high conversion efficiency, low-cost, and compactness. The proposed system incorporates additional battery-based energy storage and a dc-dc bidirectional converter to support instantaneous load changes. The output voltage of the boost-inverter is voltage-mode controlled and the dc-dc bidirectional converter is current-mode controlled. The load low-frequency current ripple is supplied by the battery, which minimizes the effects of such ripple being drawn directly from the FC itself. Analysis, simulation, and experimental results are presented to confirm the operational performance of the proposed system.
112 citations