Novel reactive power overexcitation regulation technique of synchronous generator

Abstract

The invention discloses a novel reactive power overexcitation regulation technique of a synchronous generator. A method comprises the following steps of measuring the stator voltage, the stator current, the active power and the reactive power of the synchronous generator, according to a stator current allowed by the heat generation of a stator, calculating the upper limit value of the allowable reactive power of a generator, and in accordance with the generator and a reactor connected with a power grid, calculating a reactive power value allowed by the minimum stator current of the generator; afterwards, compared a relation between the stator current and the allowable value of the stator current, when the actually measured stator current is more than the allowable value, calculating the surplus heat generation quality of the stator the generator, and when the surplus generated heat quality of the generator reaches the upper limit of the allowable heat generation margin of the generator, making the technique enter a reactive power overexcitation limiting regulation module; finally, using the larger value of the upper limit value of the allowable reactive power and the allowable reactive power value as a reactive power regulation target value, and maintaining the generator to output the reactive power which is equal to the target value. By using the technique, the safety of the generator can be protected; the exertion of a supporting effect on the voltage of the power grid is also facilitated; the stable performance of a power system is improved.

Description

technical field [0001] The invention belongs to the field of generator excitation, and in particular relates to a novel reactive power overexcitation regulation technology of a synchronous generator. Background technique [0002] The synchronous generator consists of two parts of windings: armature winding and magnetic field winding. Usually, the armature winding is a 3-phase AC static winding, so it is also called a stator winding, and the magnetic field winding is a DC rotating winding, also called a rotor winding. The DC current flowing through the rotor winding is also called the rotor current. The rotor current generates a magnetic field in the rotor winding that rotates with the rotor. The rotating magnetic field cuts the stator winding and induces the stator voltage. After the generator is connected to the grid, it sends out active power to the grid through the stator. At the same time, it exchanges reactive power with the power grid, and current flows through the sta...

AI Technical Summary

Problems solved by technology

However, it has been proved by operating practice that increasing the reactive power condition cannot fundamentally solve the above phenomenon

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