AGC control system and method based on heating-extracting flow change

Abstract

The invention discloses an AGC control system and method based on heating-extracting flow change. The system comprises a set heating-extracting flow metering device which is used for metering the set heating-extracting flow and transmitting the set heating-extracting flow to a processor. The processor is configured in that a function relation F1 (X) between a proportion coefficient and the set heating-extracting flow, and a function relation F2 (X) between an integral time parameter and the set heating-extracting flow are preset; according to the function relations F1 (X) and F2 (X), the proportion parameter and the integral time parameter of a master control PID controller are dynamically calculated and sent to the master control PID controller; a set load real-time measurement device timely measures a set load and uploads the set load to the master control PID controller; the master control PID controller is internally preset with a set load threshold; the master control PID controller is used for calculating a difference between the set load real-time measurement value and the preset set load threshold to obtain a set load deviation; and according to the set load deviation and the received proportion parameter and the integral time parameter, the dynamic adjustment of the set load is achieved.

Description

technical field [0001] The invention belongs to the field of generating set control, and in particular relates to an AGC control system and method based on the variation of heat supply and steam extraction volume. Background technique [0002] With the rapid construction of UHV smart grid and the rapid development of wind power, solar power, nuclear power and other new energy power generation, the grid structure is becoming more and more complex. The wind power output is weaker, the wind power output is more random, and the controllable frequency modulation compensation capability is worse. Therefore, for UHV receiving-end regional power grids that lack means of rapid load adjustment capabilities such as hydropower and gas-fired units, the pressure on safe and stable operation is also higher. bigger and bigger. How to effectively improve the level of automatic control of the power grid and ensure reliable power supply quality is an important issue that must be faced with th...

AI Technical Summary

Problems solved by technology

[0006] However, for the adjustment of the extraction steam turbine unit, since the unit is equipped with external heating and steam extraction in the high and medium pressure cylinders, the steam extracted from the unit only completes the work of the high pressure cylinder or the high and medium pressure cylinders, and does not participate in the work of the low pressure cylinder. , the work ability of this part of the steam is relatively weakened. Under the working conditions of different heating and extraction steam volumes, the AGC control performance index of the unit fluctuates greatly, which is not suitable for the fixed parameter PID control mode. It is necessary to realize the adjustment of the AGC of the extraction steam turbine unit. For a better regulation performance index, the influence of the heating and extraction volume of the unit must be considered

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