The current-fed dual active bridge (CF-DAB) dc-dc converter gains growing applications in photovoltaic (PV) and energy storage systems due to its advantages, e.g., a wide input voltage range, high step-up ratio, low current ripple, multiport interface capability. In addition, the direct controllability extra control freedom of CF-DAB make it possible buffer double-line-frequency grid-interactive PV without using electrolytic capacitors dc link. Therefore, system achieves reliability highly...

Delay is inevitable in digital-controlled system and the delay will change phase-frequency characteristic, thus affecting stability. The stability of inductor-capacitor-inductor (LCL)-type grid-connected inverter with single-loop control based on inverter-side current grid-side analyzed both continuous discrete domains. influence time systematically studied. A method that capable adjusting further proposed to improve applied experiment, making an unstable be stable, verifies analysis result method.

This paper proposes a novel quaternion-based attitude estimator with magnetic, angular rate, and gravity (MARG) sensor arrays. A new structure of fixed-gain complementary filter is designed fusing related sensors. To avoid using iterative algorithms, the accelerometer-based determination transformed into linear system. Stable solution to this system obtained via control theory. With only one matrix multiplication, can be computed. Using increment solution, we design that fuses gyroscope...

This paper proposes a grid-tied photovoltaic (PV) system consisting of modular current-fed dual-active-bridge (CF-DAB) dc-dc converter with cascaded multilevel inverter. The proposed allows small dc-link capacitor in the three-phase wye-connected PV system; therefore, reliability can be improved by replacing electrolytic capacitors film capacitors. low-frequency ripple-free maximum power point tracking (MPPT) is also realized converter. First all, to minimize influence resulting from reduced...

A new modulation scheme for the active clamping zero-voltage switching (ZVS) inverter is proposed. With proposed scheme, can realize ZVS operation in all devices and remarkably suppress reverse recovery current insulated-gate bipolar transistor's antiparallel diodes as well. All switches operate at a fixed frequency scheme. Also, with has some voltage boost capability, which suitable renewable energy generation. The achieve under grid power factor angle from zero to ±π/6. soft-switching...

To utilize heat and electricity in a clean integrated manner, zero-carbon-emission micro Energy Internet (ZCE-MEI) architecture is proposed by incorporating non-supplementary fired compressed air energy storage (NSF-CAES) hub. A typical ZCE-MEI combining power distribution network (PDN) district heating (DHN) with NSF-CAES considered this paper. hub formulated to take the thermal dynamic pressure behavior into account enhance dispatch flexibility. modified DistFlow model utilized allow...

A modular multilevel converter (MMC) integrated with split battery modules has been verified a better choice for the large-scale energy storage system (BESS). In this case, both ac grid and dc can exchange power BESS while transfer between grids be decoupled. However, without ability to ride through fault, performance reliability of whole will reduced. Therefore, hybrid MMC (HMMC) (HMMC-BESS) is proposed in paper. Then batteries normal continuously independently, even when short-circuit...

Currently, residential photovoltaic power generation system is increasingly used worldwide. In this paper, an optimized structure of (PV) with 1500V DC bus proposed. It includes PV panels, a three-level boost converter, high efficiency isolated bidirectional DC-DC battery and three-phase five-level DC-AC converter that can work under islanding mode or grid-connected mode. The higher voltage greatly reduces line loss improves the system. An energy management scheme for proposed in paper to...

Focusing on generalized sensor combinations, this paper deals with the attitude estimation problem using a linear complementary filter (CF). The quaternion observation model is obtained via gradient descent algorithm. An additive measurement then established according to derived results. named as CF where simplified one that quite different from previous-reported brute-force nonlinear Moreover, we prove representative derivative-based optimization algorithms are essentially equivalent each...

Game-based vocabulary learning that is well documented to improve students’ outcomes gaining increasing attention. However, no consensus has been reached regarding the impact of game-based application (APP) on achievement, motivation, and self-confidence among Chinese EFL (English as a foreign language) students, so large population should never be neglected. To address issues, total 70 college students in two groups participated quasi-experiment. One experimental group which received...

The precise temporal and spatial regulation of N5 -methylcytosine (m5 C) RNA modification plays essential roles in metabolism, is necessary for the maintenance epigenome homeostasis. Howbeit, mechanism underlying m5 C carcinogenesis remains to be fully addressed.Global mRNA levels were determined by isolation anti-m5 dot blot both retinoblastoma (RB) cells clinical samples. Orthotopic intraocular xenografts established examine oncogenic behaviours RB. Genome-wide multiomics analyses...

Abstract Osteocytes are the main cells in mineralized bone tissue. Elevated osteocyte apoptosis has been observed lytic lesions of patients with multiple myeloma. However, their precise contribution to metastasis remains unclear. Here, we investigated pathogenic mechanisms driving melanoma-induced death. Both vivo models and vitro assays were combined untargeted RNA sequencing approaches explore pathways governing We could show that ferroptosis is primary mechanism behind death context...

The performance of medical groups is receiving increased attention. Relatively little conceptual or empirical work exists that examines the various dimensions group performance. Using a national database 693 groups, this article develops scorecard approach to assessing and presents theory-driven framework for differentiating between high-performing versus low-performingmedical groups. clinical quality care, financial performance, organizational learning capability are assessed in relation...

This letter establishes the stationary frame equivalent model of proportional-integral (PI) controller in dq synchronous frame. Although both PI and proportional-resonant (PR) achieve zero steady-state error when tracing fundamental frequency reference, their amplitude phase characteristics differ greatly from each other except for frequency. Using PR to replace directly leads analytical errors, especially low stage. Another straightforward analysis method is use frame, however coupling...

Automated Writing Evaluation (AWE) has been widely applied in computer-assisted language learning (CALL) China. However, little is known about factors that influence learners' intention to use AWE. To this end, by adding two external (i.e. computer self-efficacy and anxiety) the technology acceptance model (TAM), we surveyed 245 Chinese college students tested a number of proposed hypotheses using their response data. Results revealed behavioural AWE directly determined perceived usefulness,...

The conventional power-current controlled grid-tied inverter suffers from interactive stability issues, including harmonic oscillations when connected to a weak ac grid, which limits the integrated power rating of distributed generators. To overcome preceding drawbacks, novel power-voltage control strategy, based on voltage feedback LCL filter capacitor, is proposed in this paper. A dynamic model output impedance developed rotating d-q frame. This includes main circuit parameters,...