ISMC for Boost-Derived DC–DC–AC Converter: Mitigation of $2\omega$ -Ripple and Uncertainty, and Improvement in Dynamic Performance
01 Apr 2020-IEEE Transactions on Power Electronics (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 35, Iss: 4, pp 4353-4364
TL;DR: The proposed ISM-based controller amalgamates SMC with a new dual-loop adaptive PID-control (as the nominal control) and supports the reduction of $2\omega$-ripple at the input of converter.
Abstract: In controller design, the classical control techniques have their distinct advantages and capabilities. The integral sliding-mode control (ISMC) leverages the merits of such control techniques by allowing their merger with the sliding-mode control (SMC). ISMC is composed of two components, a nominal control designed using any methodology and a discontinuous-SMC, and thus the system can have specified performance with high degree of robustness. The proposed work achieves multiple objectives, i.e., mitigates $2\omega$ -ripple, ensures robustness, and improves dynamic performance. The proposed ISM-based controller amalgamates SMC with a new dual-loop adaptive PID-control (as the nominal control). The discontinuous-SMC part ensures robustness against the matched-uncertainty, i.e., disturbances entering through the input channel such as parametric variations, exogenous disturbances, modeling-error, and the nominal control mitigate $2\omega$ -ripple at the input of dc–dc–ac converter. Moreover, the adaptive nature of nominal control improves the system performance at the large line-load transients unlike the conventional control. Furthermore, the proposed controller supports the reduction of $2\omega$ -ripple at the input of converter. The proposed control scheme is validated using 1-kW prototype.
Citations
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TL;DR: This paper provides a comprehensive review of the control approaches and the power-decoupling topologies to mitigate the ripple problem in the single-phase inverters, its solutions, and discusses open challenges yet to be addressed.
Abstract: This paper provides a comprehensive review of the control approaches and the power-decoupling topologies to mitigate 2ω-ripple problem in the single-phase inverters, its solutions, and discusses open challenges yet to be addressed. The cause and effects of 2ω-ripple problem and its solution based on the passive and active power-decoupling techniques are discussed. A subcategory of the active power-decoupling technique nominated as the control-oriented compensation technique is reviewed in detail, this technique can achieve the ripple-mitigation at the source through the control but not necessarily adds extra circuit or active filter to the system. The control-oriented compensation techniques can be applied in the two-stage DC-DC-AC converters and the single-stage inverters having a front-end control capability with the H-bridge such as in the quasi-switched-boost inverters. The merits and associated challenges of these techniques are listed and summarized in a tabular form. Finally, a conclusive discussion with open challenges is presented.
39 citations
Cites background from "ISMC for Boost-Derived DC–DC–AC Con..."
...Effect of bandwidth of voltage-loop in dual-loop control: trade-off between ripple-reduction and dynamic performance of DC-DC-AC converter [107]....
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...Comparison of simulation results for different voltage-loop bandwidths or fv [107](see Fig....
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TL;DR: In this paper, a single-phase ac to three-phase AC converter that uses a small film capacitor instead of large electrolytic capacitors is proposed, and its performance is evaluated through both simulations and experiments.
Abstract: Single-phase ac to three-phase ac converters are needed in numerous applications, including motor drives used for residential applications. These converters, however, suffer from an inherent problem of mismatch between instantaneous input and output powers. Specifically, the instantaneous input power has a dc component along with an alternating component with double-line frequency, while the three-phase instantaneous output power is only dc. Conventional single-phase ac to three-phase ac converters use large electrolytic capacitors to handle this mismatch of power. However, these electrolytic capacitors may have high failure rates, which contribute to reduced lifetime of the converters. Moreover, these capacitors can be bulky and heavy. This article introduces a new single-phase ac to three-phase ac converter that uses a small film capacitor instead of large electrolytic capacitors. Despite using a small film capacitor, the double-line frequency harmonic does not appear at the input or output currents/voltages. The principles of the operation of the proposed topology are presented in this article, and its performance is evaluated through both simulations and experiments.
8 citations
Cites methods from "ISMC for Boost-Derived DC–DC–AC Con..."
...Using a dual-loop control method based on sliding mode control is reported in [32] that mitigates 2ω ripples as well....
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TL;DR: In this article , the state model of the dc-dc boost converter is modified in such a way that it behaves like a minimum-phase system, where the control input entering the state equation for the output voltage is treated as an unknown disturbance to make the relative degree of the system equal the system's order.
Abstract: The nonminimum-phase property of the dc–dc boost converter can create difficulties in designing a stable, robust, and fast control for the output voltage. In this article, these difficulties are reduced by modifying the state model of the boost converter in such a way that it behaves like a minimum-phase system. More specifically, the control input entering the state equation for the output voltage is treated as an unknown disturbance to make the relative degree of the system equal the system’s order. As a result, the modified model does not exhibit zero dynamics, so that it can be treated as a minimum-phase system for the control design. The modified model is, then, used to derive a dynamic compensator for the output voltage regulation. More explicitly, the dynamic compensator is designed based on combining linearizing feedback control with a disturbance observer. The latter is employed to compensate for model uncertainties and unknown load with a view to ensure asymptotic regulation under the composite controller. The asymptotic regulation is achieved due to the integral action property characterizing the disturbance observer. More interestingly, after simple algebraic manipulation, it turns out that the composite controller reduces to a dynamic state feedback control plus an antiwindup scheme to mitigate the effect of control saturation during transients. The performance of the proposed controller is verified by experimental tests. The experimental results demonstrate the ability of the proposed controller to achieve good transient and steady-state performances.
6 citations
DOI•
TL;DR: In this article , the state model of the dc-dc boost converter is modified in such a way that it behaves like a minimum-phase system, where the control input entering the state equation for the output voltage is treated as an unknown disturbance to make the relative degree of the system equal the system's order.
Abstract: The nonminimum-phase property of the dc–dc boost converter can create difficulties in designing a stable, robust, and fast control for the output voltage. In this article, these difficulties are reduced by modifying the state model of the boost converter in such a way that it behaves like a minimum-phase system. More specifically, the control input entering the state equation for the output voltage is treated as an unknown disturbance to make the relative degree of the system equal the system’s order. As a result, the modified model does not exhibit zero dynamics, so that it can be treated as a minimum-phase system for the control design. The modified model is, then, used to derive a dynamic compensator for the output voltage regulation. More explicitly, the dynamic compensator is designed based on combining linearizing feedback control with a disturbance observer. The latter is employed to compensate for model uncertainties and unknown load with a view to ensure asymptotic regulation under the composite controller. The asymptotic regulation is achieved due to the integral action property characterizing the disturbance observer. More interestingly, after simple algebraic manipulation, it turns out that the composite controller reduces to a dynamic state feedback control plus an antiwindup scheme to mitigate the effect of control saturation during transients. The performance of the proposed controller is verified by experimental tests. The experimental results demonstrate the ability of the proposed controller to achieve good transient and steady-state performances.
5 citations
TL;DR: In this paper, a series linear regulator and a high-frequency high-power dc interleaved converter were proposed to obtain a low level of the output ripple as well as the limited value of the stored energy.
Abstract: High-voltage dc power supplies (HVDCPSs) have been widely adopted for the vacuum tubes. In this application field, the low ripple voltage cannot be easily achieved by increasing the size of the output capacitance of the HVDCPS due to the limited permissible level of the stored energy. To obtain a low level of the output ripple as well as the limited value of the stored energy, the previously published literature proposed switching frequency increment. This approach has several shortcomings such as switching power loss increment, a limited level of the achievable ripple, and low value of the insulators’ lifetime. To improve the mentioned deficiencies, this article hybridizes the series linear regulator and a high-frequency high-power dc interleaved converter. Using the proposed method, at the first stage, the level of the ripple decreases to a rational margin with increasing the ripple frequency. At the second stage, the level of the ripple reduces using the linear regulator to reach the expected precision. In order to validate the performance of the proposed structure, simulation and experimental results are provided for a 15-kV and 22.5-kW converter with the output voltage precision of 0.02%.
4 citations
Cites background from "ISMC for Boost-Derived DC–DC–AC Con..."
..., mitigates 2ω-ripple, ensures robustness, and improves dynamic performance [19], [20]....
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References
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TL;DR: A current-fed-type single-stage single-phase inverter is investigated, which can realise not only dc-ac power conversion but also low-frequency input current ripple reduction with a lower number of power switches based on the switch multiplexing technique.
Abstract: A large amount of ripple at twice the output frequency will emerge in the input current due to the pulsating output power in a single-phase inverter. A current-fed-type single-stage single-phase inverter is investigated. Based on the switch multiplexing technique, it can realise not only dc-ac power conversion but also low-frequency input current ripple reduction with a lower number of power switches. A control strategy is proposed, which is capable of controlling both the input and output port performance. The operation performance is analysed, including circuit parameters, efficiency and dynamic behaviour. Besides, the equivalence of control strategy and the similarity of circuit component rating are revealed between this single-stage inverter and a conventional two-stage inverter. The single-stage inverter is preferred in the applications which are sensitive to the power switch number and low-frequency input current ripple. Finally, some experimental results are performed to verify the theoretical analysis.
14 citations
"ISMC for Boost-Derived DC–DC–AC Con..." refers methods in this paper
...To solve this problem, some methods are proposed in [15]–[19]....
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TL;DR: In this paper, a neutral-point current suppression control strategy for three-phase four-wire three-level T-type inverters is proposed to reduce the neutral point current and extend the lifespan of DC-bus capacitors.
Abstract: Large electrolytic capacitors are normally applied to maintain a stiff DC-bus in uninterrupted power supply systems. However, the low-frequency currents flow through them, which can reduce their lifespan and risk the system reliability. Therefore, this study investigates the neutral-point current and corresponding suppression scenarios for three-phase four-wire three-level T-type inverters. First, the neutral-point current for three-level T-type inverters is analysed and the mathematical expression is obtained. With the mathematical model, the neutral-point currents in cases of different load conditions are investigated. In order to reduce the neutral-point current and extend the lifespan of DC-bus capacitors, a neutral-point current suppression control strategy is proposed. The basic concept of the proposed control strategy and its effectiveness in cases of different load conditions are presented. Finally, a 30 kW T-type three-level inverter platform is built and the experimental results are presented to verify the theoretical analysis.
12 citations
TL;DR: This paper proposes an adaptive sliding-mode controller to shape the output impedance of the boost-circuit of quasi-switched boost inverter such that the propagation of the ripple from dc link to the dc-input source is resisted.
Abstract: There have been several advanced topologies proposed by the community for micro-inverter applications. However, many such applications suffer from unwanted second-order harmonic current ripple at dc input. Moreover, in the absence of suitable passive filter or ripple compensator, the second-order harmonics ripple may propagate into the dc source. This results in several problems to the system, related to system efficiency, life, cost, size, reliability, and stability. This paper proposes an adaptive sliding-mode controller to shape the output impedance of the boost-circuit of quasi-switched boost inverter such that the propagation of the ripple from dc link to the dc-input source is resisted. The quasi-switched boost inverter is one of the advanced and suitable topologies for the micro-inverter applications. The adaptive nature of the proposed controller improves the transient performance of the system at the line–load transients unlike some existing solutions, which affects dynamics adversely to achieve ripple mitigation objective. The controller ensures voltage regulation within ${5\%}$ at dc link. The proposed control technique is verified using a lab-prototype of 500 W quasi-switched boost inverter.
12 citations
Additional excerpts
...In our previous work [20], [21], the nonlinear adaptive sliding-mode control (SMC)-based techniques are proposed to mitigate SHC ripple and to improve dynamic performance simultaneously....
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TL;DR: This study proposes a family of two-port switching networks (TSNs) to achieve ripple power decoupling and output voltage step-up at the same time and simulations and experimental results are presented to show the effectiveness.
Abstract: Active decoupling methods are developed for tackling the inherent second-order ripple power. However, in all the active decoupling methods developed for single-phase current source rectifier (SCSR), the dc output voltage is limited to half the peak amplitude of the ac source voltage. That limits SCSR's wide applications. Addressing that issue this study proposes a family of two-port switching networks (TSNs) to achieve ripple power decoupling and output voltage step-up at the same time. The main circuit is formed by inserting the TSN into the dc link of a conventional SCSR. Compared with the most existing SCSRs with decoupling capability, no extra semiconductor devices are added. Related operating principle and modulation scheme are described first. Then the selection of the decoupling capacitance is discussed. A closed-loop control strategy is also introduced to achieve good compensation performance. Finally, simulations and experimental results are presented to show the effectiveness.
7 citations
"ISMC for Boost-Derived DC–DC–AC Con..." refers background in this paper
...In the literature, several active decoupling techniques are available [10]–[13]....
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