Calculation method for natural torsional vibration frequency of half-speed nuclear power unit

Abstract

The invention discloses a calculation method for the natural torsional vibration frequency of a half-speed nuclear power unit. The calculation method comprises the steps as follows: 1) obtaining rotational inertia of lumped-mass blocks and rigidity coefficients among all the mass blocks of the half-speed nuclear power unit; 2) establishing a rotational inertia matrix and a rigidity coefficient matrix of the half-speed nuclear power unit; 3) calculating a state space matrix of a rotation state equation of the half-speed nuclear power unit; 4) determining a characteristic value of the state space matrix with a characteristic value calculation method. A new characteristic value application algorithm is designed, according to the algorithm, the rotational inertia matrix of the half-speed nuclear power unit and the rigidity coefficient matrix of the mass blocks of the unit are used as the basis, the rotation state equation is used, parameter per-unit treatment is performed, and interface models of an electrical system and a mechanical system are unified. The method is applicable to calculation of the natural torsional vibration frequency of the half-speed nuclear power unit, high in degree of combination with practical engineering and applicable to subsynchronous oscillation analysis of the type of nuclear power units.

Description

technical field [0001] The invention is a method for calculating the natural torsional vibration frequency of a half-speed nuclear power unit, which belongs to the transformation technology of the calculation method for the natural torsional vibration frequency of a half-speed nuclear power unit. Background technique [0002] Vigorously developing nuclear power is the latest direction of my country's energy policy development. According to the medium and long-term development plan of nuclear power approved by the State Council in 2007, by 2020, the operating installed capacity of nuclear power will reach 4.0×107kW, accounting for 4% of the total installed capacity of electric power. The total installed capacity of nuclear power units currently in operation in my country is 9.068×106kW, accounting for only 1.1% of the total installed capacity of electric power in my country. This means that in the past 10 years, about 30 nuclear power units above 1 million kilowatts will be ...

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Problems solved by technology

[0009] (3) The size and weight of half-speed steam turbines are large, and the installation, manufacturing and transportation costs of steam turbines are higher than those of full-speed steam turbines

[0011] The application of eigenvalue algorithm to the study of unit subsynchronous oscillation is a mature technology, but the research and analysis method for half-speed nuclear power units is relatively rare

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