Abstract
This Paper studies the effect of new suggested ferroresonance limiter on controlling ferroresonance oscillations in the power transformer. It is expected that this limiter generally can control the ferroresonance. For studying these phenomena, at first ferroresonance is introduced and a general modeling approach is given. A simple case of ferroresonance in a three phase transformer is used to illustrate these phenomena. Then, effect of new suggested ferroresonance limiter on the onset of chaotic ferroresonance and control of these oscillations in a power transformer including linear core losses is studied. Simulation is done on a three phase power transformer while one of its phases is opened, and effect of varying input voltage on occurring ferroresonance overvoltage is studied. Results show that connecting the ferroresonance limiter to the transformer exhibits a great controlling effect on the ferroresonance overvoltage. Phase plane diagram, FFT analysis along with bifurcation diagrams are also presented. Significant effect on occurring chaotic ferroresonance, the range of parameter values that may lead to overvoltage and magnitude of ferroresonance overvoltage is obtained, showed and tabulated.
Highlights
The ferroresonance is typically initiated by saturable magnetizing inductance of a transformer and a capacitive distribution cable or transmission line connected to the transformer
The initial conditions as calculated from steady-state solution of MATLAB are: 0,0; vl 1.44 pu Simulation is done in two categories, first: power system simulation including transformer linear core losses effect and second: power system simulation considering ferroresonance limiter resistance effect
Power transformer is modeled with linear core losses, and dynamical study clearly shows that chaotic ferroresonance can occur due to the abnormal switching action
Summary
The ferroresonance is typically initiated by saturable magnetizing inductance of a transformer and a capacitive distribution cable or transmission line connected to the transformer. Controlling ferroresonance oscillations in potential transformer considering nonlinear core losses and the circuit breaker shunt resistance effect has been investigated in [14] and [15]. New suggested ferroresonance limiter is used as compact circuit including one resistor, power electronic switch and control circuit for limiting and stabilizing of unstable and high amplitude ferroresonance oscillation. This resistance is connected to the grounding point of the power transformer and during ferroresonance occurrence; power electronic switch is connect the resistor to the transformer via the controlling circuit.
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