This paper presents a new control strategy based on Lyapunov-function and proportional-resonant (PR) controller for single-phase grid-connected LCL-filtered voltage-source inverters (VSIs). While Lyapunov-function-based guarantees the global stability of system, PR is employed to process grid current error determine inverter reference. However, it shown that conventional (CLFBC) together with cannot damp inherent resonance LCL filter. Therefore, this approach modified by adding capacitor...

This paper presents a sliding-mode control (SMC) strategy for single-phase grid-connected LCL-filtered voltage source inverters (VSIs) with double-band hysteresis scheme. The proposed SMC is simpler than the existing methods devised VSIs since its sliding-surface function requires sensing of capacitor and grid current only. In addition, scheme which ensures switching transistor in VSI during half cycle while it remains either on or off other fundamental period used to mitigate frequency....

In this study, an extended Lyapunov-function-based control strategy that assures global asymptotic stability is proposed for single-phase UPS inverters. The Lyapunov function formed from the energy stored in inductor and capacitor due to fact system states converge equilibrium point if total continuously dissipated. It shown analytically classical leads a globally asymptotically stable at expense of steady-state errors output voltage, which exist lack outer voltage loop input. Therefore,...

In this study, a fuzzy‐PI controlled grid interactive inverter has been designed and implemented. The proportional integral gains of the PI controller are decided tuned by fuzzy logic (FLC) according to required operation point system. Thus, adaptive nature FLC robust structure synthesised. Eventually, an which can adopt changes because different conditions, disturbances natural effects with fast transient response is obtained. Simulation studies validated experimental results. Both...

In this paper, a dual half-bridge <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converter with magnetic control is proposed for the battery charger application. The primary switches are shared by two networks, and their outputs connected in series. One of converters designed to operate at series frequency, which also highest efficiency operating point, constant output voltage characteristic achieved point. second adopts...

The LLC resonant converters commonly adopt frequency modulation (FM) or combination of FM with phase-shift to regulate its output voltage. However, in these control schemes, a variable switching range is required, which makes the magnetic components design complicated. Therefore, this article, (or inductor control) adopted make converter operating at constant and duty cycle. fundamental harmonic analysis used because characteristic simplicity. accuracy method reduced considerable errors...

Microgrids usually employ distributed energy resources such as wind turbines, solar photovoltaic modules, etc. When multiple generation with different features are used in microgrids, managing these becomes an important problem. The generated power of modules and turbines microgrids is constantly changing irradiation speed. Due to this impermanent uncertain nature renewable resources, generally, storage systems employed microgrid systems. To control the units sustain supply demand balance...

In this article, a four-port solid-state transformer and control scheme to the power flow output voltage are studied, developed, tested. The converter consists of three ports with H-bridge converters one port diode bridge rectifier. capable bidirectional routing as well reactive contribution in volt/Var scenario. rectifier provides dc for load connection. Different arrangements four windings analyzed, simulated, compared achieve an optimal design. A new strategy, which uses combination...

A microgrid can be defined as a grid of interconnected distributed energy resources, loads and storage systems. In systems containing renewable the coordinated operation generation units is important to ensure stability microgrid. needs successful control scheme achieve its design goals. Undesirable situations such distorted voltage profile frequency fluctuations are significantly reduced by installing appropriate hardware systems, strategies. The multi-agent system one approaches used...

The LLC resonant converters have been widely used in many applications due to their features such as wide input voltage range, high efficiency, and power density. Therefore, the analysis methodology for converter is of great importance. Based on existing literature, there are mainly four methodologies: (i) fundamental harmonic analysis; (ii) frequency domain with time partial correction; (iii) complete (iv) or operation mode-based analysis. However, no systematic view study different...

This study deals with various Lyapunov‐function‐based control (LFBC) schemes proposed for a single‐phase grid‐connected voltage source inverter LCL filter. Use of filter causes resonance which may adversely affect the controller's stability. The conventional (CLFBC) scheme employing inverter‐side current guarantees asymptotic global stability, but it is not able to damp resonance. As remedy poor damping, adoption grid‐current and capacitor‐voltage feedback have been investigated. Although...

The power and voltage levels of renewable energy resources is growing with the evolution electronics switching module technologies. For that, need for development a compact highly efficient solid-state transformer becoming critical task in-order to integrate current AC grid new systems. objective this paper present design, implementation, testing multi-port microgrid integration applications. proposed system has four-port four converters connected ports. windings integrated on single common...

In this article, a new topology for grid-connected solar photovoltaic inverter the direct connection to medium-voltage grid is proposed. This employs an <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LLC</i> resonant converter with high-frequency (HF) isolation transformer in dc–dc stage. The output of stage rectified sine wave voltage and current at line frequency. An unfolder interfaces between dc grid. A combined phase-shift frequency...

The inherent unlimited high switching frequency of the sliding mode controller (SMC) is limited by practical constraints hysteresis modulation (HM) technique. inductor current and output voltage a converter can be regulated using combination HM-SMC. However, HM-SMC results in variable operation, which not preferred due to Electromagnetic Interference (EMI) issues. In this paper, an interval fuzzy designed developed as solution enable addition, robust surface proposed, provides improved...

ABSTRACT This study proposes an efficiency‐oriented control approach for LLC resonant converter‐based high‐frequency‐link grid‐connected inverter. The proposed topology has two stages. In the first stage, converter generates a rectified sine wave output synchronized with grid voltage. However, achieving zero gain under this operating condition is challenge converter. To address this, combination of phase‐shift modulation and pulse‐frequency employed without relying on topology‐morphing...

In this paper, interval type-2 fuzzy logic controller based maximum power point tracking method is proposed for photovoltaic systems. The controlle ...

In this paper, a high efficiency, decoupled on-board battery charger is proposed. The proposed topology composed of two LLC resonant converters sharing the same full-bridge inverter with constant switching frequency. outputs are connected in series. One operated at frequency, which highest efficiency operation point. magnetic control adopted for second converter to fulfill closed-loop charge voltage and current (CV) (CC) modes. can achieve zero (ZVS) all primary switches (ZCS) secondary...