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Analysis method of voltage stability for bulk power system by P-V and Q-V curves considering dynamic load

A novel analysis method of the voltage stability for bulk power system is proposed by introducing the P-V and the Q-V curves based on the dynamic load. Firstly, a bulk power system is exactly rewritten into a simple nonlinear decentralized system by the power flow calculation. Next, the dynamic load is modeled in a higher order polynomial form identified from the observed data at a load-bus. Then, the system and the load P-V and Q-V curves are constructed, and finally the reactive power is shown to be more sensitive to the voltage stability than the active one by considering the curves.