A coordinated control method for thermal power units based on condensate throttling

Abstract

The present invention discloses a thermal power generating unit coordination control method based on condensate throttling which belongs to the thermal power generating unit coordination control technology field. The method comprises the steps of sending a unit load deviation to a master controller; using the master controller to send out a rotating speed change instruction, and changing the rotating speed of a condensate pump motor after an amplitude limit module; changing the unit load to form the condensate throttling control due to the condensate flow change; integrating the condensate flow variable quantity to obtain a water storage variable quantity delta Q in a deaerator, and obtaining the deaerator instant water level height hx corresponding to the delta Q by utilizing a dichotomy; forming the deviation of the hx and a deaerator water level setting height ho to sent to a slave controller, using the slave controller to generate a fuel quantity instruction signal to send to a coal mill to thereby influence the unit load and form the fuel quantity control, and recovering the deaerator water level to h0. The thermal power generating unit coordination control method based on the condensate throttling enables the changing load-acceleration of a coal-fired generating unit to be improved greatly, the schedulability of the coal-fired generating unit to be improved, and has great benefits for the new energy electric power large-scale grid connection of our country.

Description

technical field [0001] The invention belongs to the technical field of coordinated control of thermal power units, and in particular relates to a coordinated control method of thermal power units based on throttling of condensed water. Background technique [0002] The large-scale development and utilization of new energy power has brought huge impacts and challenges to the safe and stable operation of the power grid. The power grid urgently requires more power sources with good dispatchability in the system, such as gas / oil power generation, pumped storage, etc. However, my country's power structure layout is dominated by coal-fired thermal power generation, and its variable load rate is generally maintained at 2% / min of the rated load, which is difficult to meet the needs of large-scale grid connection of new energy power. Therefore, improving the variable load performance of traditional coal-fired thermal power units and increasing their variable load rate will be of grea...

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Problems solved by technology

[0003] At present, coal-fired generating units generally use the machine-boiler coordination method for variable load control, which basically uses the heat storage on the boiler side, but due to the large delay and large inertia of the boiler side, it is difficult to greatly increase the variable load rate

Siemens first proposed that the energy storage of the regenerative heater can be used to quickly adjust the load, but the available energy storage of this method is limited, and it is necessary to restore the heater and the condensate system to normal operation after the unit reaches a given load Condition

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