Coordinative control method for pulse-mode regulation of condensate flow to participate in frequency modulation

Abstract

The invention discloses a coordinative control method for the pulse-mode regulation of condensate flow to participate in frequency modulation, which comprises four steps: 1: several control forms in a traditional coordinative control mode are defined, i.e. three control modes including boiler following mode (BF), turbine following mode (TF) and coordinative control (CC); 2: a transfer function schematic diagram of the traditional coordinative control mode are given; 3: compared with the traditional coordinative control, the new coordinative control system for unit additionally adopts the frequency of a condensate pump frequency converter as regulating amount and the water level of a deaerator as regulated amount, so this system is changed into a 3x3 coupling system; and 4: the purpose of changing unit load is achieved by means of pulse-mode regulation for condensate flow. Aiming at the load-pressure control object in a thermal power unit boiler-turbine system, a new control method for the pulse-mode regulation of condensate flow to partially replace main steam valve and participate in modulation for power grid frequency is designed, and this method has good reference and practical values in the technical field of industrial control for thermal power generation procedures.

Description

(1) Technical field [0001] The present invention relates to a coordinated control method using condensed water throttling technology to participate in power grid frequency regulation, in particular to a coordinated control method for adjusting condensed water flow in pulse mode and participating in frequency regulation, which is aimed at load-pressure control of thermal power unit boiler-steam turbine system Object, a new coordinated control method designed to adjust the condensate flow in a pulse mode to partially replace the main steam control valve to participate in the adjustment of the grid frequency belongs to the field of industrial control technology for thermal power generation processes. (2) Background technology [0002] Coordinated control of boiler-steam turbine units in large thermal power plants is a difficult point in thermal automatic control of thermal power units. The many new problems currently faced by thermal power units also highlight the urgency of re...

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Problems solved by technology

[0004] (b) In order to meet the requirements of power grid frequency regulation, the main steam valve of the thermal power unit is frequently adjusted, and the range of action is increased, which causes the main steam pressure to fluctuate violently, and the economic index of the unit also drops significantly;

[0005] (c) The quality of coal used for power generation in thermal power plants has gradually declined, and the quality of coal has changed greatly, resulting in a further decline in the quality of unit coordination and control;

[0006] (d) Some thermal power plants try to use condensate water throttling to participate in unit load adjustment, but because of improper methods, they cannot meet the needs of power grid frequency regulation

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