Synchronous torsional vibration excitation method simultaneously excitating multi-turbine generator set torsional vibration

Abstract

The invention relates to an experimental method for simultaneously exciting out unit shafting torsional oscillation of a plurality of turbo-generator units in a large thermal power plant, which discloses an excitation method for realizing the synchronous torsional oscillation of a plurality of generating sets based on a synchronous torsional oscillation excitation device through GPS time tick, the synchronous torsional oscillation excitation device sends out synchronous torsional oscillation excitation signals having the same frequency with the unit mode to each generating set, the signals act on excitation systems of turbo-generator units and generate controllable electric torque in the turbo-generator units through the excitation systems, the shafting torsional oscillation on the plurality of units can be further excited out simultaneously, meanwhile, the strength of shafting torsional oscillation of each generating set can be detected for confirming the safety of the unit shafting. The method can accurately and controllably generate shafting torsional oscillation synchronously on the plurality of large turbo-generator units, and provides a test means for researching the effectiveness and setting of various measures for restricting sub-synchronous oscillation (SSO) and sub-synchronous resonance (SSR).

Description

technical field [0001] The invention relates to electric power systems, large thermal power plants, industrial fields requiring steam turbine generator sets, and electric power fields related to subsynchronous oscillation or subsynchronous resonance of electric power systems. Background technique [0002] Large-scale thermal turbine unit technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight, flexibility, multi-support, large span and high power density. The utilization factor of generator materials is improved, and the shafting section power The density increases relatively, the lengthening of the shafting reduces the torsional stiffness, the natural frequency spectrum of the shafting is relatively dense, and the energy of induced vibration is low; at the same time, the ultra-high voltage long-distance transmission of the power system uses a large number of series compensation capacitor...

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Problems solved by technology

[0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the cross-sectional power of the shafting The density is relatively increased, the lengthening of the shaft system reduces the torsional stiffness, the natural frequency spectrum of the shaft system is relatively dense, and the energy induced by vibration is low; at the same time, the ultra-high voltage long-distance transmission of the power system uses a large number of series compensation capacitors to improve the power transmission capacity of the power grid, and The application of new power transmission and distribution and control technologies using power electronic components. These new grid technologies may lead to subsynchronous resonance (SSR) or subsynchronous oscillation (SSO). SSR / SSO may cause serious torsional vibration of generator sets. Until the shafting of the unit breaks

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