The impedance of the harmonic plane in a dual three-phase permanent magnet synchronous motor (DTP-PMSM) is very low, meaning that even small voltages can induce significant currents, particularly at fifth and seventh frequencies. These currents severely degrade system performance increase losses. To address this issue, mechanism current generation due to non-sinusoidal back electromotive force (EMF) inverter nonlinearity first analyzed. Then, overcome challenge excessive controllers...

Energy storage systems based on dual active bridge (DAB) converters are a critical component of DC microgrid systems. To address power oscillations and system stability issues caused by deficits during the off-grid operation microgrids, control strategy for DAB energy voltage droop is proposed. By analyzing internal operational mechanisms electronic integrating equations, small-signal model constructed to deeply investigate dynamic characteristics under conditions. Using Nyquist criterion,...

Bidirectional wireless power transfer greatly improves the reliability of supply. However, communication between primary and pickup controllers is usually required to transmit load information, which has time delay easily interfered by electromagnetic fields. Existing solutions avoid use can be divided into three categories: additional dc/dc circuit, side bridge control, secondary control. Compared with other two methods, control low loss good robustness. But, it requires phase-locked loop...

Abstract Background and purpose Nitrous oxide (N 2 O) induced neurological symptoms are increasingly encountered. Our aim is to provide clinical diagnostic characteristics with a focus on electrodiagnostic studies. Methods Patients sequelae due N O presenting in our hospital between November 2018 December 2021 reporting data were retrospectively reviewed. Results Seventy patients (median 22 years) included. Median usage was 4 kg/week during 12 months. Patients’ history revealed higher rate...

In this article, an optimized fault-tolerant control (FTC) method without current judgement is proposed for open-switch faults (OSFs) in dual three-phase permanent magnet synchronous motor (DTPMSM) drives. The reason the torque ripple under OSFs has been investigated. theoretical analysis reveals a significant increase OSFs. Then, FTC DTPMSM with two isolated neutral points. maintains original scheme, enabling smooth transitions of and between faulty operation introducing noticeable ripples....

Regarding the site of arterial access during intervention, transracial intervention can reduce risk bleeding and vessel-related complications as well improve patient comfort. Importantly, distal radial artery (DRA) approach may incidence occlusion digital ischemia, but feasibility safety DRA in performing subdiaphragmatic vascular interventions remain unclear. From January 2018 to December 2019, 106 patients were admitted our department for visceral angiography by left accessing an...

This letter proposed an embedded silicon carbide (SiC) power module with low parasitic inductance and thermal resistance for high-frequency high-temperature applications. The SiC <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> s were oriented in a face-down configuration Cu connecting blocks, contributing to better switching performance heat dissipation. simulation results showed that the total was lower than 300 pH. Double pulse...

Droop control has attracted widely attention in microgrids because of its plug-and-play advantages. However, due to the lack inertia conventional droop control, rate change frequency (ROCOF) may exceed limited value during disturbances, affecting operational reliability microgrid. In this paper, an adaptive virtual (AVIDC) method is proposed, which can adjust adaptively, overcome influence sampling noise, and accelerate system transient adjustment process while suppressing ROCOF. Then,...

Electric vehicles have gradually become the mainstream means of transportation. As a way energy storage, electric can participate in flexible regulation grid frequency. However, when great quantity are connected to grid, stability power system will be affected. On one hand, grid-forming output active they frequency modulation is introduced. other inertia adjustment strategy applied control vehicles, which limits change rate inverters and optimizes dynamic characteristics. Finally, an example...

Ovarian arterial haemorrhage (OAH), a rare cause of spontaneous retroperitoneal hematoma (SRH), usually occurs in women during pregnancy or those with history repeated pregnancies.The clinical manifestations OAH are non-specific; hence, proper and timely imaging examinations extremely important.Contrast Enhanced CT scan is the first choice for clarifying patients SRH.Trans-arterial embolisation (TAE) has become most common treatment option OAH.Here, we report case SRH left ovarian artery...

Objective To compare a prospective ECG-gated high-pitch spiral technique (Flash) and conventional retrospective for the image quality of coronary artery stent radiation dose with dual source CT.Methods One hundred fifty five stents in one twenty patients (mean age 64.9 ± 10.6 years,heart rates≤65 bpm) were examined using CT.All divided two groups,receiving either Flash or CT angiography separately.After images reconstructed both smooth (B26) sharp (B46) kernel,the lumen scored by observers...

Abstract Background Adrenal vein sampling (AVS), the gold standard for confirmation of primary aldosteronism (PA) subtype, is technically challenging. Here, we assessed benefit trans-catheter contrast-enhanced ultrasonography (CEUS) in right adrenal gland imaging and its potential to improve AVS success rates among inexperienced interventionalists. Methods was performed on all included PA patients (n = 61; 39 men; mean age, 52 ± 8.81 years) by a single interventionalist (who had no...

The traditional detailed model of wind farms is unsuitable for large due to the complexity, long simulation time and high hardware requirements. This paper presents an equivalent farms, effects different speeds wake are considered. Wind turbine generators (WTGs) with same speed were classified models each part WTG was established. An WTGs established based on multimachine equivalence method. results show that under configuration software step size, required farm reduced significantly good accuracy.

In battery energy storage systems based on cascaded H-bridge multilevel converter, maintaining a balanced state of charge (SOC) among batteries in different modules is both advantageous and essential. However, traditional methods face challenges control parameter design, resulting potential issues such as insufficient balancing effects or over-modulation. To overcome these challenges, this paper proposes method for designing adjustment coefficients the system-wide balance strategy. The...

Ovarian arterial haemorrhage (OAH), a rare cause of spontaneous retroperitoneal hematoma (SRH), usually occurs in women during pregnancy or those with history repeated pregnancies. The clinical manifestations OAH are non-specific; hence, proper and timely imaging examinations extremely important. Contrast Enhanced CT scan is the first choice for clarifying patients SRH. Trans-arterial embolisation (TAE) has become most common treatment option OAH. Here, we report case SRH left ovarian artery...