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Integration of high levels of wind power penetration is an important feature of the emerging smart transmission grid. To address the dramatic voltage fluctuations and wind turbine generators (WTGs) cascading trip faults, which have been greatly challenged the wind pool area's operation, a hierarchical automatic voltage control system to support wind power integration (Wind-AVC) is designed and presented...
This paper studies a smart home energy management system (SHEMS) based on time-of-use pricing (TOU). Different kinds of appliances and multiple energy sources are coordinated for economic benefits considering users' experience. Models are improved and the value of stored energy is considered. Simulation results indicates that more than 31% payments saving can be obtained, including non-price profits...
Energy management system (EMS) utilizes information flow to control power flow in order to balancing and optimizing the power flow every moment and place. Conventionally, the EMS is centralized one. However the architecture of future EMS is distributed & autonomous, interactive & coordinated. A new concept and architecture of future EMS for smart girds, i.e. EMS family, are proposed. Some...
Three critical cascading faults with nearly 2000 WTGs (Wind Turbine Generator) tripped took place in China on early 2011, from which the reactive power and voltage control issues for large wind farms are spotlighted. Some key factors inducing the cascading trip are surveyed by this paper firstly, including WTGs voltage distribution, dynamic reactive power reserves and coordination of tight-coupled...
This paper presents an early warning and preventive control system for dynamic security, which has been used in several provincial power grids in China. The framework and the main modules of the proposed system are introduced. The system architecture is based on a Multi-agent system which is developed by our team. The modules like on-line contingency assessment, total transfer capacity evaluation,...
The feasibility and potential benefits of the system-wide Automatic Voltage Control (AVC) in PJM system are studied in this paper. A test AVC system with a hierarchical structure is adopted for simulation study, which is based on eight typical real-time snapshots from the solutions of state estimator in the PJM's Energy Management System (EMS). For each snapshot, the control action simulation is executed...
In order to meet the requirements of some important field site applications, IEC61970 Common Information Model (CIM) standard has been extended in China, such as extensions of external network equivalent model and HVDC model. The extended CIM has been applied in many Chinese Electrical Power Control Centers (EPCCs) successfully. As an example of integration of applications developed by different vendors...
The energy management system (EMS) is the core of an electric power control center (EPCC) to manage and control the power system in a secure and economical way. Because the power system nowadays is large and interconnected (in the space dimension), the operational state is continuously varying (in the time dimension), and the control objectives are numerous (in the dimension of objectives), an EMS...
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