Method for measuring influence of voltage measurement time constant on dynamic stability of unit

Abstract

The invention discloses a method for measuring the influence of a voltage measurement time constant on the dynamic stability of a unit, and belongs to the technical field of power systems. The method provided by the invention comprises the following steps: introducing additional difference adjustment into a Phillips-Heffron model of a single-machine infinite bus system, and determining a coefficient of the Phillips-Heffron model into which the additional difference adjustment is introduced; obtaining an excitation additional synchronous torque coefficient, a generator overall synchronous torque coefficient formula, an excitation additional damping torque coefficient and a generator overall damping torque coefficient formula; according to the expanded Phillips-Heffron model, obtaining the system oscillation frequency; and quantizing the influence of the voltage measurement time constant on the dynamic stability of the self-shunt excitation unit according to the synchronous torque coefficient and the damping torque coefficient increment. The deduced synchronous torque formula is simple and effective on the basis of the extended Phillips-Heffron model and the characteristic value of the characteristic equation of the model, and the method is suitable for practical engineering application.

Description

technical field [0001] The invention relates to the technical field of electric power system, and more specifically, relates to a method for measuring the influence of voltage measurement time constant on the dynamic stability of a unit. Background technique [0002] With the development of UHV AC-DC large-scale interconnected power systems, the safe and stable operation of power systems is becoming increasingly important. The generator excitation system plays a very significant role in ensuring the stability of system voltage and reactive power. Now most large power plants are wired for generator transformers way, and the high-voltage side of the main transformer is connected in parallel to the same busbar, so if the excitation voltage of a unit in the same power plant changes, it will not only change the reactive power and voltage of the unit, but also affect the performance of other units operating in parallel. Reactive power, which causes changes in the bus voltage, most...

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Problems solved by technology

The size of the voltage measurement time constant directly affects the excitation control speed, but there is no quantitative method to measure the influence of the voltage measurement time constant on the dynamic stability of the self-shunt excitation unit at the current engineering site, so that technicians can take into account the dynamic stability of the generator when selecting related equipment sexual influence

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