Turbine DEH system high-pressure regulating valve flow characteristic testing and setting method

Abstract

The invention discloses a turbine DEH system high-pressure regulating valve flow characteristic testing and setting method, which comprises the steps: relieving the AGC and the primary frequency modulation control method of a DEH system high-pressure adjusting valve, and recording the main steam pressure of a unit; relieving the coordination control method and the DEH remote control method of the DEH system high-pressure adjusting valve, and switching in a DEH valve control method and main steam pressure constant pressure automation; forcedly closing the high-pressure adjusting valve by an instruction according to a specified rule, and recording data; forcedly opening the high-pressure adjusting valve by an instruction according to a specified rule, and recording data; determining a flow characteristic correction curve of the high-pressure adjusting valve according to experimental result data. The testing and setting method has the beneficial effects that the unit efficiency and whole performance indexes are improved, the automation control level is improved, the operation efficiency of the unit is improved, and primary energy is saved.

Description

Technical field [0001] The invention relates to the field of digital electro-hydraulic control of steam turbines, in particular to a method for testing and setting flow characteristics of a high-pressure regulating valve of a steam turbine DEH system in a multi-valve control mode. Background technique [0002] According to the current dispatching operation rules, the AGC unit must operate according to the dispatch curve, and the primary frequency modulation unit must be able to quickly respond to the fluctuation of the network frequency, which places higher requirements on the control system of the unit. "Implementation Rules for the Management of Auxiliary Services for Grid-connected Power Plants in North China" and "Implementation Rules for Grid-connected Operation Management of Power Plants in North China" require units to respond quickly, accurately and stably to load changes, which requires high-profile units to respond quickly Changes in unit load. However, the load respon...

AI Technical Summary

Problems solved by technology

However, while the load responsiveness of the high-speed door of some units is improved, the opening of the door is very easy to overshoot or undershoot, which will cause load fluctuations and have a certain impact on the grid load stability.

[0003] During the production process, when the steam turbine runs for a period of time or when the unit is overhauled or the steam flow of the steam turbine is transformed, after the valve is disassembled and overhauled, the flow characteristics of the valve will change. As a result, sudden changes and maintenance of the flow of the unit will cause door vibration, slow load response or oscillation, and the expected effect cannot be achieved simply by adjusting the PID parameters, seriously affecting the unit's variable load capability and primary frequency regulation performance

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