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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...
Traditionally voltage control is done in a decentralized way at the power plant or substation level in China. Such a traditional mode, lacking of automatic coordination in a system level, is no longer fit for the higher requirements of security and economy of modern large power system operation. In recent years, development and field site applications of close-looped system-wide automatic voltage...
The State Estimator function in a control center today is a suite of three programs solved sequentially: topology processing, state estimation, and bad data detection-identification. The state estimation equations are nonlinear because the inputs are mostly real and reactive power measurements. A linear state estimator is possible if the inputs are only complex currents and voltages and if there are...
Energy management systems (EMSs) suffer from poor external modeling during wide area event occurring in interconnected power systems. In order to improve this situation, an IEC61970 standard based hierarchical network remodeling system for electrical power control centers is designed in China. In this designed system, through a wide-area communication network, each underlying control center automatically...
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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