Digital electro-hydraulic regulating system for steam turbine

Abstract

The invention discloses a digital electro-hydraulic adjusting system for steam turbine, comprising decentralized control system at each control point in unit, virtual controlling emulator system and program control system. By program control system actual running parameters of each unit transmitted by decentralized control system and purpose value in database are compared and parameters are corrected so that units are run under the best parameters and working conditions meanwhile datum are transmitted to monitoring system, and fault diagnosing and optimal controlling system so that fault diagnosing and prewarning are performed in time. Compared with prior technology, auto-controlling, optimal running, safety monitoring, fault diagnosing and forecasting are integrated so that automatic management level of power enterprise is improved. It is provided with large economical and practical value in automatic controlling for production process in power enterprise.

Description

1. Technical field [0001] The invention relates to an automatic control system of electric power production process, in particular to a digital electro-hydraulic regulating system of a steam turbine. 2. Background technology [0002] The steam turbine regulation system is a multi-variable control system. At present, the hydraulic regulation system is mostly used for control. The disadvantages of this control method are: the quality is not high, such as the coupling of thermoelectric load regulation, and the self-regulation is not enough; the regulation system is only proportional regulation, The adjustment accuracy is not high, the overshoot is large, the adjustment time is too long; the high and low pressure oil motors are not synchronized, etc.; and once the adjustment parameters are set in the factory, it is difficult to change on site, which is especially prominent in the extraction steam turbine. Difficult to use. Since the fully hydraulic control unit can only achieve...

AI Technical Summary

Problems solved by technology

[0002] The steam turbine regulation system is a multi-variable control system. At present, the hydraulic regulation system is mostly used for control. The disadvantages of this control method are: the quality is not high, such as the coupling of thermoelectric load regulation, and the self-regulation is not enough; the regulation system is only proportional regulation, The adjustment accuracy is not high, the overshoot is large, the adjustment time is too long; the high and low pressure oil motors are not synchronized, etc.; and once the adjustment parameters are set in the factory, it is difficult to change on site, which is especially prominent in the extraction steam turbine. Difficult to use

Since the fully hydraulic control unit can only achieve proportional adjustment, and the synchronizer adjustment range is limited (generally 96%-106%), slippage often occurs in high-pressure units (within 50MW and 90ata inlet steam parameters), and the adjustment parameters of the start-up adjustment cannot meet the rated initial The operation needs under the final parameters, such as the performance that the load cannot be added or the load cannot be fully reduced

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