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Nowadays, with the introduction of competitive electricity markets, large scale interconnected power grids are operated closer to their operation limits, and power system operators often have a dual and conflicting responsibility for system security and for profit maximization. Insuring power grid operating safely and stably under complicated operating conditions has become a rigorous challenge to...
During the application of power system security check, a variety of raw data acquired from different sources, including the information of current operation state, day-ahead forecasting and scheduling etc., should be integrated to generate the cross-sections dataset describing the future operation. The original power system modeling information is exported by SCADA/EMS in CIM format. Furthermore,...
In power system, coordination controllers are usually designed based on the data from PMU and WAMS. Time delays in the measurement data are significant so that they can not be simply ignored. So, it is important to evaluate the impact of time delays on power system stability analysis and controller design. In this paper, an extended small signal stability region in time delay space (DE-SSSR) is presented...
Since there exist significant time delays in the data of phasor measurement unit (PMU) and wide-area measurement system (WAMS), to evaluate their impact is very important for power system online stability assessment and controller design in the wide-area environment. In this paper, we use Lyapunov stability theory and linear matrix inequality (LMI) method to analyze the impact of time delays on power...
Nowadays, technologies of distributed generation (DG) and distributed energy resource (DER) are developing rapidly. It has been demonstrated to be more reliable and economical that DGs or DERs are integrated into the traditional power grid based on micro-grid. So, more and more micro-grids will occur in distribution system in the future. In this paper, we mainly concern and discuss the impact of micro-grids...
Dynamic security region (DSR) gives power system engineers systematic and global information about the feasible operation region. This paper is a result of an investigation into the use of DSR concept and its effective application in bulk power systems. It particularly concerns with developing a software-based tool for the transient stability monitoring in the on-line operation environment. A practical...
Voltage stability margin of regional network is not a fixed quantity but closely related to operation condition and operation constrains. This paper proposes an effective method to estimate the real-time voltage stability margin based on some locally synchrophasor measurements. A Radial Basis Functions (RBF) neural network is employed to estimate the regional margin. The validity of the method is...
After some disastrous instabilities and blackouts, power system voltage stability has drawn even more attention. When a serious fault occurs, proper control should be quickly adopted to terminate the system deterioration. In this paper, a control method based on power flow tracing is presented to enhance power system voltage stability. Firstly, a branch-admittance-decreasing algorithm is introduced...
Delay margin means the maximum delayed time that power system can sustain without losing its stability. Since, there exists significant time delay in the data of phasor measurement unit (PMU) and wide-area measurement system (WAMS), to evaluate system delay margin is very important for power system online stability assessment and controller design in the wide-area environment. In this paper, we use...
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