Low-Carbon and economic flexibility scheduling of power system with multiple generation resources penetration

The operation flexibility of the power system suffers great challenges due to the vigorously developing of renewable energy resources under the promotion of the carbon neutralization goal. To this end, this paper proposes an economical and flexible energy scheduling method for power system integrated with multiple generation resources while considering the operation of low-carbon. Specifically, flexibility evaluation indexes are constructed to describe the characteristics of the flexible generation units. Then they are connected with the flexibility of the power system in an economic and low-carbon flexible energy scheduling model. To coordinate the operation economy, flexibility, and carbon emission reduction, the model incorporates demand response, operational characteristics, and flexibility requirements. Further, the model is fully validated through the simulation on the modified IEEE 30-bus system. Results demonstrate that: the proposed method can reduce the system’s carbon emission and total operating costs and promote photovoltaic consumption

Modeling and Verification of A Novel Vector Hysteron Model

A novel implementation of a hysteresis operator in the framework of Vector Hysteron Model (VHM) is presented to describe rotational magnetization. In order to simulate the effect of anisotropy on the magnetization process more effectively, this paper changes the method of using the equipotential surface to simulate the magnetization process in the VHM model, and discusses a new scheme. This model uses the bifurcation curve as the critical surface equation of the hysteron, and uses the method of the directed bifurcation curve to solve the hysteron's critical surface equation. To further discuss the simulation performance of the model under different excitations, this paper identifies the experimental data at different frequencies, and the Moving functions are used to describe the identified parameters. The comparison between simulation results and the experimental data has been given hereafter and it is shown that the new approach is acceptable and shows good effectiveness

Low-Carbon and economic flexibility scheduling of power system with multiple generation resources penetration

The operation flexibility of the power system suffers great challenges due to the vigorously developing of renewable energy resources under the promotion of the carbon neutralization goal. To this end, this paper proposes an economical and flexible energy scheduling method for power system integrated with multiple generation resources while considering the operation of low-carbon. Specifically, flexibility evaluation indexes are constructed to describe the characteristics of the flexible generation units. Then they are connected with the flexibility of the power system in an economic and low-carbon flexible energy scheduling model. To coordinate the operation economy, flexibility, and carbon emission reduction, the model incorporates demand response, operational characteristics, and flexibility requirements. Further, the model is fully validated through the simulation on the modified IEEE 30-bus system. Results demonstrate that: the proposed method can reduce the system’s carbon emission and total operating costs and promote photovoltaic consumption.</jats:p

Benzene Sulfonate Modified ZnCr-LDH&amp;nbsp;and Its Enhanced Adsorption Properties for Anionic Dyes

Abstract A benzene sulfonate modified hydrotalcite (SO3-LDH) was synthesized by a facile one-pot hydrothermal technique, which can efficiently remove methyl orange (MO), Congo red (CR) and orange II (OII) from aqueous solution. After modified by benzene sulfonate, the microstructure of hydrotalcite changes obviously, from the cellular structure to the stacking structure formed by the face-face contact of hydrotalcite nanosheets, which resulted in much more exchangeable nitrate ions to remain in the interlayer space. The pre-insertion of benzene sulfonate as a pillar expanded the interlayer gallery, which facilitated the pollutant anions (MO, CR and OII) into the interlayer of LDH in the subsequent adsorption process. The maximum adsorption capacity of SO3-LDH for MO, CR and OII was 4200.8 mg/g, 1252.0 mg/g and 1670.6 mg/g respectively, which is approximately 1.86 times, 1.8 times and 2.32 times that of the pristine NO3-LDH, respectively. The removal mechanism of anionic dyes was determined as anion exchange between NO3− ions and dye molecules. The adsorption behavior for MO and OII is multilayer adsorption, while the adsorption behavior for CR is monolayer adsorption. The adsorption process mainly was controlled by the chemical bonding between the dye molecules and adsorbent active sites. The benzene sulfonate modified LDH has a great potential to be used as a high-efficient adsorbent to remove anionic dyes from aqueous solution.</jats:p

Magnetostrictive Vibration Characteristics of Amorphous Alloy Transformer With Three-Dimensional Wound Core

The amorphous alloy transformer with three-dimensional wound core (TDWC) is a new type of transformer structure. Compared with the traditional three-phase five-column transformer with planar wound core (PWC), the TDWC structure exhibits a fully symmetrical magnetic circuit, resulting in enhanced short-circuit withstand capability. However, the vibration noise of the core becomes a significant engineering challenge in the design and manufacturing process due to the larger magnetostrictive coefficient of the amorphous alloy. This study establishes a magnetic-mechanical coupling mathematical model for amorphous alloy TDWC considering the magnetostrictive effect. Three-dimensional finite element analysis (FEA) is adopted to calculate the flux and vibration displacement distribution of the TDWC. Additionally, an experimental validation is conducted on a 200kVA amorphous alloy TDWC prototype to verify the accuracy of the model. Furthermore, a comparison with the PWC prototype demonstrates that the TDWC structure can effectively reduce surface vibrations, and the dominant frequency distribution law of vibration displacement at different positions of the TDWC structure is revealed, providing a foundation for the design of vibration reduction and noise control for TDWC

Serum iron fluctuations link ferroptosis process with mortality and prognosis of acute pancreatitis

Summary: Recently, the existence of ferroptosis has been confirmed in chronic pancreatitis. However, its role in acute pancreatitis (AP) process, especially in critical status, has not yet been mentioned. To verify this hypothesis, we included 873 AP patients (training set) and 1,188 NAFLD patients (internal validation set) selected from MIMIC-III (Medical Information Mark for Intensive Care) database and 218 AP patients (external validation set) in Linshui County People’s Hospital ICU data. We analyzed the correlation between mortality and ferroptosis associating factors (such as serum iron, ALP, lactate, etc.) in them through regression analysis. In addition, to test the significance of these factors, the nomogram, AUC, and DCA analysis were applied. The results showed that serum iron, IBC, ALP, and lactate (p < 0.05) were independent factors for the mortality and prognosis of these patients. These correlations suggest ferroptosis and follow-up cell programmed death may own an important clinical interference significance among this population