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This paper addresses on-line early detection of inter-area electro-mechanical oscillations in power systems using dynamic data such as currents, voltages and angle differences measured across transmission lines in real time. The collected data are evaluated in real-time with the main objective to give the transmission operator qualitative information regarding stability margins. In our approach an...
The voltage stability and the sensitivity of power grid are presented by introducing the P-V and the Q-V curves based on the dynamic load. Firstly, a power grid is exactly rewritten into a simple equivalent decentralized system by the power flow calculation. Next, the dynamic load is modeled in a higher order polynomial form identified from the data at a load-bus observed in Sweden. Then, the system...
With the development of power grid interconnection, the low frequency oscillation including local modes and inter-area modes is becoming more notable. And the effectiveness of local power system stabilizer (LPSS) in damping inter-area modes is not very well. Then the global PSS (GPSS) based on WAMS (wide area measurement system) is proposed which is aimed to damp inter-area modes. This paper summarizes...
With the development of power grid interconnection, the low frequency oscillation is becoming more and more prominent which threats the stability of the system. It consists of local modes and inter-area modes, and the effectiveness of local PSS in damping inter-area modes is limited. Then the global power system stabilizer (GPSS) based on WAMS (Wide Area Measurement System) is proposed. First 3 problems...
We present a novel method for placing PMU in power systems based on power system intrinsic characteristics. In the method power system was first analyzed for find out the major or critical interchanges and major load areas, major control systems, critical equipments and power plants in the power system. The overall PMU facilities should provide comprehensive information of line flows, bus conditions,...
This paper investigates Chinese standards for power system security and the practices in the relevant strategy. Considering the cascading features of typical system-wide blackouts around the world, further emphasis is given to integration of various wide area measurements, trajectory-based knowledge extracting, on-line quantitative security analysis, and adaptive optimization of preventive control,...
In this paper, key techniques, limits and feasible applications of wide area measurement system (WAMS) and wide area control system (WACS) are investigated and the framework for Wide area Monitoring Analysis Protection-control (WARMAP) is introduced to break those limitations. Based on engineering experiences in China, application functions depending merely on phasor measurement unit (PMU) data are...
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