Results 81 to 90 of about 16,216,609 (215)

A comprehensive coordinated control strategy of MMC-HVDC system for frequency support and DC overvoltage suppression

International Journal of Electrical Power & Energy Systems
To enhance frequency support and fault ride-through capabilities of MMC-HVDC system, an MMC multi-time scale coordinated control strategy considering the regulation dead zone is proposed, which achieves wide-area coordinated complementarity of multiple ...
Shouqi Jiang, Demao Lu, Guoqing Li, Yechun Xin, Lixin Wang, Mingze Zhang   +5 more
doaj   +1 more source

DC transformer requirements and fault operation analysis in PV medium voltage DC power collection system

The Journal of Engineering, 2019
The large PV medium-voltage (MV) DC power collection system is more efficient than the traditional AC collection system, which provides an alternative for future PV applications.
Xi Xinze, Wang Jianhua, Gao Shang, Zhang Mingqin, Li Peixin, Luo Fangfang, Gu Wei   +6 more
doaj   +1 more source

Collective Bargaining in Germany: Trends and Challenges

Industrial Relations: A Journal of Economy and Society, EarlyView.
ABSTRACT This paper examines the evolution, institutional structure, and challenges of collective bargaining in Germany. Collective bargaining addresses labor market imperfections, redistributes productivity gains, and shapes working conditions. Germany's system centers on industry‐level agreements, complemented by firm‐level agreements and voluntary ...
Lutz Bellmann, Christian Dustmann, Bernd Fitzenberger   +2 more
wiley   +1 more source

“Why?”: C. Wright Mills on the Spirit of the Classical Sociological Tradition and Positivist Versus Critical Sociology

Sociology Lens, EarlyView.
ABSTRACT Despite their very diverse interests, the classical sociological thinkers were concerned with analyzing the dramatic social transformations in the wake of colonialism, slavery, and modern industrial capitalism as well as the multiple revolutions, particularly in relation to the new forms of social inequalities and power disparities.
Zaheer Baber
wiley   +1 more source

Governing Transnational Commons: How International Treaties and Multi‐Stakeholder Organizations Shape Cooperation and Conflict

Journal of Management Studies, EarlyView.
Abstract When common‐pool resources such as freshwater, clean air, and fisheries span national borders, the collective action problems encountered are particularly severe. This study explores the role of polycentric governance systems in overcoming these pressing problems, which frequently underlie global grand challenges. Integrating political economy
Amol M. Joshi, David Antons, Erk P. Piening, Christina Dienhart, Torsten‐Oliver Salge   +4 more
wiley   +1 more source

DC Fault Current Estimation in a Multi-Terminal Hybrid MMC-HVDC System Considering Fault Ride Through Control

, 2021
The DC fault current estimation is of importance to predict the worst scenario and optimize an HVDC system. Based on the hybrid modular multilevel converter (MMC) with the fault ride through (FRT), this paper investigates its DC fault current estimation ...
Kaipei Liu, Liu, Kaipei, Liang Qin, Yi Zhang, Zhang, Yi, Yi Xu, Blaabjerg, Frede; id_orcid, Frede Blaabjerg, Xu, Yi, Qin, Liang   +9 more
core   +1 more source

Comparative Performance Evaluation of Wind Energy Systems Using Doubly Fed Induction Generator and Permanent Magnet Synchronous Generator

Wind
Wind energy has become a cornerstone of sustainable electricity generation, yet the reliable integration of wind energy conversion systems (WECSs) into modern grids remains challenged by dynamic variations in wind speed and stringent fault ride-through ...
Areeg Ebrahiem Elngar, Asmaa Sobhy Sabik, Ahmed Hassan Adel, Adel S. Nada   +3 more
doaj   +1 more source

Optimizing the roles of unit and non-unit protection methods within DC microgrids [PDF]

, 2012
The characteristic behavior of physically compact, multiterminal dc networks under electrical fault conditions can produce demanding protection requirements.
Burt, Graeme, Norman, Patrick, Galloway, Stuart, Fletcher, Steven, Crolla, Paul   +4 more
core   +2 more sources

From Civic Tech to DOGE: The Role of Tech Movements in the American Administrative State

Public Administration, EarlyView.
ABSTRACT The second Trump administration saw the Department of Government Efficiency (DOGE), a group of outsider technologists given extraordinary power to pursue a massive downsizing of the federal government. They also displaced an alternative approach: the civic tech movement.
Donald Moynihan
wiley   +1 more source

Fault ride through of fully rated converter wind turbines with AC and DC transmission systems

, 2009
Fault ride through of fully rated converter wind turbines in an offshore wind farm connected to onshore network via either high voltage AC (HVAC) or high voltage DC (HVDC) transmission is described.
Ekanayake, Janaka Bandara, Hughes, F. M., Ramtharan, G., Arulampalam, A., Jenkins, Nicholas   +4 more
core   +1 more source