Method for measuring influence of voltage measurement time constant on generator damping
A time constant and voltage measurement technology, applied in the field of power systems, achieves strong engineering practicability, good robustness, and simple and effective formulas
Inactive Publication Date: 2021-05-25
CHINA ELECTRIC POWER RES INST +2
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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 damping of the self-shunt excitation unit at the current engineering site, so that technicians can take into account the influence on the generator damping when selecting related equipment
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[0025] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0026] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a method for measuring the influence of a voltage measurement time constant on generator damping, and belongs to the technical field of power systems. The method comprises the following steps of: determining a coefficient of a Philips-Heffron model in which additional difference adjustment is introduced; obtaining an extended Philips-Heffron model, and obtaining an excitation additional damping torque coefficient and generator damping torque coefficient formula when a voltage measurement time constant is given; acquiring system oscillation frequency; and quantizing the influence of the voltage measurement time constant on the damping of a self-shunt excitation unit according to damping torque coefficient increment. According to the method, the deduced damping torque formula is simple and effective on the basis of the expanded Philips-Heffron model and the characteristic value of the characteristic equation of the model. The method is suitable for practical engineering application.
Description
technical field [0001] The present invention relates to the technical field of power systems, and more particularly, to a method for measuring the influence of voltage measurement time constants on generator damping. 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 hydropower units, mo...
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IPC IPC(8): G01R31/34
CPCG01R31/34
Inventor 霍承祥李志强岳雷濮钧郭强安宁马晓光孙华东于大海
Owner CHINA ELECTRIC POWER RES INST