Abstract
A multi-objective reactive power optimization strategy for mitigating voltage fluctuation in power network caused by geomagnetic storm
Highlights
Solar storms caused by violent outburst of explosive activities on the sun may lead to geomagnetic disturbances (GMDs)
After the Quebec blackout caused by a GMD in 1989, PR Barnes pointed out that the blackout was caused by two factors: (1) geomagnetically induced currents (GICs) caused the increase in transformer reactive power demand and (2) the existence of the harmonics forced the capacitor banks to drop out, which caused a voltage collapse triggered by the reactive power imbalance.[3]
While calculating the value of GIC-Q, we considered the direction of the electric field between [0°, 180°]
Summary
Solar storms caused by violent outburst of explosive activities on the sun may lead to geomagnetic disturbances (GMDs). This process is as follows: calculate the response values of the configuration points based on the configuration points obtained through the power flow calculation model; in turn, determine the undetermined coefficients of the Hermite polynomial by solving the linear system of equations; and the probability distributions of all variables are obtained according to the combination of the Hermite polynomial and the power flow equation. Under the condition where the structure and capacity of the grid have been defined, this study makes full use of the existing adjustable reactive power output of generator and on-load voltage regulating transformer, and at the same time, collocates reactive power compensation equipment at appropriate nodes to deal with voltage fluctuations caused by the GIC-Q to ensure the safe and stable operation of the power system under the GMD. The objective functions and constraint functions of the multi-objective are as follows
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