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This paper presents a single phase grid-connected PV system integrating energy storage system (ESS) using cascaded multilevel inverter. A Discrete Fourier Transform (DFT) Phase Locked Loop (PLL) method is proposed to improve system dynamic performance. A coordinated active and reactive power management (ARPM) strategy is developed based on the dual-stage DFT PLL method. The point of common coupling...
Since LCL filter has smaller inductance value comparing to L type filter with the same performance in harmonic suppression. It is gradually used in high-power and low-frequency current-source-controlled grid-connected converters. However design of LCL filter's parameter not only relates switch frequency ripple attenuation, but also impacts on performance of grid-connected current controller. This...
LCL filter is applied to reduce the high harmonic originated from grid-connected inverters, which could reduce value of inductance and improvement system dynamic performance. Account of the resonance problem of LCL filter, a current dual-loop control strategy is introduced. The current-mode dual-loop control strategy based on capacitor current loop which is chosen as the inner loop to damp the resonance...
LCL filters offer a better choice of attenuating switching frequency harmonics. However, in a grid-connected system, an LCL filter may cause resonance which is a disaster for the system's stability. In order to solve the problem, a two-current-loop control strategy, which includes grid-current outer loop and filter-capacitor-current inner loop, is adopted here. The implementation of this strategy...
This paper theoretically analyzed and established the state-space mathematical model of the single-stage three-phase PV converter with LCL filter, and proposed a design procedure of the pole-assignment control method based on state feedback and repetitive controller of current regulation. Additionally, the MPPT is realized by using improved P&O method with adaptive step algorithm, furthermore...
This paper presents a novel model for average current control that can be applied to the buck-cascaded buck-boost converter (BuCBB) with two independently controlled switches in universal input power factor correction (PFC) circuits. The proposed BuCBB PFC model consists an averaged BuCBB topology with all the switching elements replaced by dependent sources and an average current control scheme with...
LCL filter offers a better choice of attenuating switching frequency harmonics, since compared with L or LC filters the value of required inductance is smaller. But LCL filter may cause resonance which is a disaster for the systempsilas stability. In order to solve the problem, a two-current-loop control strategy which includes grid-current outer loop and filter-capacitor-current inner loop is used...
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