REAL TIME VOLTAGE STABILITY MONITORING AND CONTROL USING SYNCHROPHASORS
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One new real-time Voltage Stability Monitoring framework and its corresponding Advanced Voltage Control scheme provide the possibility of improvement in voltage stability, security and control in power systems. They take full advantage of the new measurement method Synchrophasors in current bulk power system so that more accurate assessment and control action can be achieved in less time using complex information. First, one real-time Voltage Stability Monitoring framework is developed to utilize the proposed "global voltage stability assessment index" to detect the weak buses. This framework could be a totally model-free design. For each individual bus, only the information from the local PMUs is needed. So the proposed global voltage stability assessment index becomes possible by real time relation of the "Line Sensitivity". That is, the line sensitivities are directly calculated from Synchrophasor measurements. Although this methodology is quite different from the classical ones which are widely used in current power systems, the conclusions from them are confident. The Advanced Voltage Control scheme is the next step after assessment of voltage stability. This proposed control design is problem-oriented. All available SVCs, capacitor banks, reactor banks and LTC transformers will be included as potential control devices. The controller will select certain control devices to mitigate the system voltage violation so that the control actions will also satisfy other realistic requirements rather than the voltage limit constraints, such as the minimum switching cost and proper device priority. The controller will evaluate the control action by the line sensitivities attained by installed Synchrophasors at this bus and the other local buses.