On-line monitoring method and system for generator safety leading phase capability margin

Abstract

The invention provides an on-line monitoring method for generator safety leading phase capability margin. The method comprises the following steps: constructing a generator reactive power minimizationobjective function based on a generator power angle equation; acquiring data of generator leading phase operation under different active outputs from a WAMS system to construct a sample library, andestablishing a function relationship and constraint conditions between a target variable and an independent variable; constructing a leading phase limit optimization model of the generator according to the function relationship and the constraint condition; judging whether the generator is in a leading-phase operation state or not by acquiring current active power and reactive power of the generator in real time; and when the unit is in a leading-phase operation state, starting the leading-phase limit optimization model for calculation to output the leading-phase limit and leading-phase capability margin of the generator under the current active output working condition. The method provided by the invention is simple in modeling, small in calculation amount, high in calculation speed, highin result precision and high in operation mode generalization capability, and realizes online monitoring of the leading phase capability margin of the generator without a field test.

Description

technical field [0001] The invention relates to the technical field of generator control, in particular to an online monitoring method and system for generator safety phase advance capability margin. Background technique [0002] The phase-advancing operation of synchronous generators is an important means to enhance the voltage regulation capability of the power grid, and is of great significance to the safe and economical operation of the power grid. With the continuous changes in the structure of my country's modern interconnected power system, the problem of excess reactive power and high voltage in local power grids has become increasingly prominent during low load periods of the power system. As the most important reactive power source in the power grid, the generator's phase-advance voltage regulation capability has been widely used due to its advantages of significant effect, simple and easy implementation, and good investment economy, and has attracted more and more...

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Problems solved by technology

[0005] The test result curve fitting method is based on the maximum phase advance depth value obtained from the phase advance test under several typical active power output conditions, and the data fitting method is used to obtain the phase advance depth curve under different active power. This method has poor adaptability to changes in operating modes and conservative results, and cannot be used for online monitoring;

[0006] The mechanism modeling method is based on the mathematical model of the generator and its power grid, through analytical calculation or simulation software to obtain the phase advance limit value under different active working conditions, because the generator and the system connected to it have multiple variables, strong Due to the characteristics of coupling and complex nonlinearity, this method has problems such as difficult modeling, large amount of calculation, and low accuracy, and it cannot be used for online monitoring.

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