System and method for testing large steam turbine volume time constant

Abstract

The invention belongs to the technical field of power grid stability analysis of a power system, and particularly relates to a system and method for testing a volume time constant of a large steam turbine. The system mainly comprises steam turbine governor valves, a main steam pressure transmitter, a governing stage pressure transmitter, an intermediate pressure cylinder steam inlet pressure transmitter, a low pressure cylinder steam inlet pressure transmitter, a displacement sensor and other measuring devices, a data acquisition module, and parallel experiment function modules additionally arranged in the load command link in control logic. Through testing and data analysis of signals for reflecting the steam turbine volume time constant, the accurate steam turbine volume time constant can be acquired, the reliability of a steam turbine speed governing system simulation model and the accuracy of model parameters of the model are improved, the steam turbine volume time constant can be comprehensively and quickly measured, and the requirements for stability calculation and analysis of a power grid are met.

Description

technical field [0001] The invention belongs to the technical field of power system grid stability analysis, and in particular relates to a large-scale steam turbine volume time constant test system and a test method thereof. Background technique [0002] In order to maintain the stability of the power grid, the steam turbine generator set that supplies power to the grid needs to have frequency regulation capabilities. When the grid frequency changes, the generator set immediately reverses the power of the unit through the steam turbine speed control system to achieve the purpose of stabilizing the grid frequency. A large steam turbine refers to a steam turbine generator set with a reheat cycle of more than 200MW. The steam turbine is composed of one high and medium pressure combined cylinder (or one high pressure combined cylinder, one medium pressure cylinder), and one or two low pressure cylinders, such as figure 1 As shown, the main steam from the boiler enters the high-...

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Problems solved by technology

[0003] When a large steam turbine participates in the primary frequency regulation process of the power grid, due to the large capacity of the unit, the high level of steam parameters, and the existence of the volume of the steam turbine, the rhythm of the adjustment of the power of the generator set by each cylinder of the steam turbine is not consistent, which makes the generator set participate in the primary frequency regulation process of the power grid. Insufficient adjustment amount and unstable adjustment process

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