North China Electric Power University

Adaptive Damping Control for Stability Enhancement of Grid-Following Converters Based on q-Axis Voltage Magnitude Feedback

Grid-following converters are prone to transient synchronization instability during grid faults, which may lead to the disconnection of renewable energy devices and threaten the security and stability of power systems. To address this issue, this paper first establishes a second-...

Co-enhancement of energy efficiency and dynamic flexibility for indirect air-cooled systems under frequent peak-shaving: Trade-offs of cost, performance and robustness

Deep peak-shaving operation of coal-fired power units requires heat-exchange equipment to rapidly track varying loads. Indirect air-cooled units are central to power supply in water-scarce regions, and their cold-end system rejects heat to ambient air and possesses substantial th...

Modeling and hierarchical energy storage dispatch control of a pulverized coal buffer unit for flexible operation of coal-fired power plants

With the increasing integration of renewable energy, coal-fired power units require higher operational flexibility. However, the delays caused by raw coal grinding and pulverized coal transport in conventional direct fired pulverizing systems limit rapid load response. To address...

MoO3 Doping Modulates CeO2/TiO2 Catalysts for Simultaneous NO x Reduction and Toluene Oxidation in Alkali-Rich Flue Gas: Unraveling the Microscopic Electronic Origin via DFT Calculations

Abstract CeO2/TiO2 catalysts are prone to severe deactivation in KCl-enriched flue gas environments derived from biomass or solid waste combustion during the removal of NO and toluene. While MoO3 doping significantly improves their resistance to KCl poisoning, the microscopic int...

Comparative analysis of heat–power decoupling technologies and hot-water tank optimization for deep peak shaving of a 350 MW supercritical combined heat and power unit

To improve the deep peak-shaving capability of combined heat and power (CHP) units under high-penetration renewable energy integration while maintaining heating security and operational economy, this study investigates a 350 MW supercritical extraction heating unit. An off-design...

Comparative corneal biomechanical characteristics in polypoidal choroidal vasculopathy and neovascular age-related macular degeneration analyzed by corvis ST: a cross-sectional study

To explore the differences in corneal biomechanical characteristics among patients with polypoidal choroidal vasculopathy (PCV), neovascular age-related macular degeneration (nAMD), and healthy individuals. This cross-sectional study included patients with nAMD or PCV and healthy...

Investigation of the heat transfer of supercritical carbon dioxide in a vertical tube under high-temperature and high-pressure conditions

The design and refinement of the supercritical carbon dioxide (S-CO 2 ) direct cycle nuclear energy system are crucial for advancing the application of green energy and mitigating the energy crisis. The key to this lies in the research on the heat transfer characteristics of S-CO...

Whether smaller guest droplets facilitate hydrate conversion: Effects of nanodroplet size and droplet interactions from molecules perspective

To overcome the self-limiting of hydrate formation, dispersing the guest phase into smaller droplets to create more guest-water interfaces provides an effective strategy for enhancing hydrate conversion. However, dispersing the guest phase into a larger number of smaller droplets...

Parameter decoupling analysis and equipment-constrained multi-objective optimization of electrochemical–thermodynamic synergy for a SOFC–semi-closed CO2 Brayton cycle hybrid system

To achieve efficient near–zero–carbon power generation, this study focuses on a hybrid system integrating a solid oxide fuel cell (SOFC) with a semi–closed CO 2 Brayton cycle. This configuration offers both high efficiency and inherent CO 2 capture, yet supercritical operation is...

Strengthening the BZCYYb electrolyte/cathode interface for protonic ceramic fuel cells via Ni doping and in situ exsolution

A reliable electrolyte/electrode interface is crucial to the performance of protonic ceramic fuel cells (PCFCs), yet the poor sinterability of proton-conducting electrolytes and their limited interfacial bonding with cathodes remain challenging. This study proposes a synergistic...

Yaw-Control Optimization for Floating Wind Farms Considering Platform Repositioning

Wake losses constrain power capture in deep-offshore floating wind farms. Unlike fixed-bottom turbines, yaw control in floating turbines changes both wake propagation and aerodynamic thrust; the resulting platform repositioning further alters wake overlap. To investigate the coup...

A High‐Performance Dibenzothiophene‐Terminated Self‐Assembled Hole Transport Monolayer for Perovskite Solar Cells

ABSTRACT Self‐assembled hole transport monolayers (SAMs) have become indispensable components of high‐performance inverted perovskite solar cells (PSCs). SAMs not only govern the interfacial hole extraction kinetics but also influence the crystallization quality of the overlying...

Unraveling the mechanism of programmable heating and quenching in enhancing tar yield from PVC pyrolysis: a ReaxFF MD study

The conventional continuous heating (CCH) method for recovering polyvinyl chloride (PVC) has limitations that result in a low tar yield. The programmable heating and quenching (PHQ) method can increase the tar yield of PVC, but the underlying mechanism was still unclear. In this...

Direct Silicon/Perovskite Heterojunction Solar Cells Enabled by Interfacial Energetics and Charge-Selective Contact Engineering

Abstract Single-junction crystalline silicon (Si) and perovskite solar cells are approaching their fundamental efficiency limits, while the prevailing Si/perovskite tandem architecture requires complex sub-cell interconnection and current matching. Here, we developed a Si/perovsk...

Modeling and quantification of beam steering uncertainties in high-pressure laser absorption spectroscopy of non-uniform physical fields

Beam steering induced by refractive index gradients poses a significant challenge for laser absorption spectroscopy in high-pressure, non-uniform combustion environments. This work establishes a physics-based framework to model and quantify beam steering effects on path-integrate...

La-induced stabilization of Fe-Ni active phases in NiFe2O4 via in situ LaFeO3 formation for efficient CO2 hydrogenation to CO

Catalytic hydrogenation of CO 2 to CO via the reverse water-gas shift (RWGS) reaction provides an attractive route for renewable hydrogen utilization and carbon recycling. NiFe 2 O 4 spinels are promising RWGS catalysts owing to abundant oxygen vacancies and excellent CO 2 activa...

A 3D Metal–Organic Framework Protective Layer with Size-Selective Channels and Zincophilic Sites for Highly Stable Zinc Metal Anodes

Aqueous zinc-ion batteries possess intrinsic operational safety, low cost and scalable application potential, making them promising candidates for large-scale energy storage. However, Zn metal anodes still suffer from severe dendrite proliferation, hydrogen evolution, interfacial...

Offshore wind power forecasting based on phase-space guided representation and regime-adaptive differential attention mechanism

Offshore wind power forecasting is challenged by nonlinear dynamic evolution, multi-scale atmospheric fluctuations, and redundant environmental disturbances under complex marine conditions. This paper develops a phase-space guided forecasting model with a regime-adaptive differen...

Optimization and analysis of phase-locked loop for grid-following inverters with weak grid connection

Purpose This study aims to analyze and enhance the stability of three-phase grid-connected inverters in weak grid environments, with a particular focus on the negative impact of the phase-locked loop (PLL) on system stability. Design/methodology/approach A small-signal transfer f...

Dual-branch network for threat analysis of external-force hazards on power transmission lines

External-force hazards have become a major cause of faults in overhead transmission lines. Existing studies focus on hazard detection, but do not localize the transmission-line safety region or analyze whether a detected target is threatening the line. To address this issue, we p...