Optimal tuning method for nuclear power unit excitation and pss parameters with enhanced system damping

Abstract

The invention relates to a nuclear power unit excitation and PSS parameter optimization setting method enhancing system damping. The method integrates digital-analog hybrid simulation and an on-site test method. Firstly, by means of digital-analog hybrid simulation, frequency domain eigenvalue analysis and time domain disturbance simulation are carried out on a simulation grid, dynamic invariant features and important oscillation information between interconnected network areas are extracted, weight sequencing is carried out on the unit by means of a participation matrix and PF module value, and unit excitation and PSS parameter optimization research is carried out on the nuclear power unit with the largest participation factor; by means of sensitivity analysis, main optimization parameters of an engine excitation system are determined, an optimization interval suitable for AVR and PSS parameters is determined by carrying out simulation research in multiple operation modes, and finally, by means of on-site test research, stability and effectiveness are determined when unit optimization parameters are operated in a power plant are determined. The method can be more suitable for actual grid operation features and can be more suitable for on-site actual units, and guarantees stable operation of a system.

Description

technical field [0001] The invention belongs to the field of electrical engineering science, and in particular relates to a nuclear power unit excitation and PSS parameter optimization setting method for enhancing system damping. Background technique [0002] The power supply and its auxiliary equipment that supply the excitation current of the synchronous generator are collectively called the excitation system, which generally consists of two parts: the excitation regulator and the PSS. The excitation regulator controls the output of the excitation power unit according to the input signal and the given adjustment criterion, and provides the excitation current to the rotor of the synchronous generator. The excitation regulator itself is a hysteresis unit that produces negative damping, and its electromagnetic torque △Me is negatively projected on the △ω axis. The control method of PSS is that in the automatic excitation regulator AVR, in addition to the voltage deviation △U...

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Problems solved by technology

[0004] At present, there are no related reports on the optimization research and field test of the excitation and PSS parameters of nuclear power units in China. The existing parameters of the excitation system of nuclear power units mostly adopt the parameters provided by the manufacturer. On this basis, the uncompensated phase frequency of the excitation system is measured through experiments. The hysteresis characteristic is compensated by the lead-lag link through PSS, which is often difficult to adapt to the operation requirements of the unit in various complex ways of the actual power grid

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