Method for effectively improving quick response on external load change for generator set

Abstract

The invention relates to a method for effectively improving quick response on external load change for a generator set. The method comprises the following steps of (1) quickly estimating rough fuel quantity required by a generator set under a practical load command via a function f1(x) by a generator set load control loop; (2) according to the specific mode of a boiler powder preparing system, properly regulating the function f1(x); (3) adding a differential module into the generator set load control loop, and regulating the differential action intensity and the differential action time of the practical load command; (4) leading the deviation signal of machine front pressure into the master-control feedforward loop of the boiler and the master-control loop of a steam turbine, and meanwhile, changing the fuel quality of the boiler and the capacity of a steam turbine generator set. According to the method disclosed by the invention, the change of boiler heat storage quantity in the generator set load change process is effectively compensated, the nolinear characteristic of the coal-fired boiler is compensated, and the capability of the generator set for quickly adapting to the external load is improved.

Description

technical field [0001] The invention belongs to the technical field of automatic power generation control, in particular to a method for effectively improving the quick response of a generator set to changes in external loads. Background technique [0002] The main feature of the power system is that power generation and power consumption are completed synchronously. Therefore, in order to continuously provide users with qualified electric energy, it is necessary to ensure that the output of the generator set is kept in balance with the external power load at any time. This requires that the generator set must be able to quickly respond to changes in external loads. Ability. [0003] At present, the method of maintaining balance between the output of the generator set and the external power load is as follows: figure 1 As shown, after the boiler command passes through the lead / lag function module, it is input to the high selection module at the same time. After passing thro...

AI Technical Summary

Problems solved by technology

The main control of the boiler does not introduce the feed-forward signal of the actual load command, and cannot directly and quickly adjust the fuel amount according to the change of the actual load command outside the unit. In addition, it does not consider the nonlinear characteristics of the boiler, and cannot compensate the change of the boiler heat storage during the unit load change process. Unable to solve the contradiction between the difference in response speed to external load requirements between boilers and steam turbines

In addition, in the original control method, the deviation signal of the pre-machine pressure is not introduced into the load given loop of the main control of the turbine and the feedforward loop of the main control of the boiler, so that the main control of the steam turbine and the main control of the boiler can jointly stabilize the pre-machine pressure and improve The ability of the generator set to quickly respond to external load changes

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