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Main steam temperature PID control method of ultra supercritical unit based on improved genetic algorithm

A technology for improving genetic algorithms and ultra-supercritical units, which is applied to controllers, control systems, and electric controllers with specific characteristics, and can solve problems such as lack of effective support for hardware and software implementation, complex structure, and many parameter setting rules.

Active Publication Date: 2012-11-14
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

These studies have a very good role in promoting the exploration of main steam temperature control methods under large-scale variable loads, but there are problems such as complex structures and many parameter setting rules, which make them lack effective support in software and hardware implementation, especially It caused certain difficulties to the application of the DCS layer in the actual field

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  • Main steam temperature PID control method of ultra supercritical unit based on improved genetic algorithm
  • Main steam temperature PID control method of ultra supercritical unit based on improved genetic algorithm
  • Main steam temperature PID control method of ultra supercritical unit based on improved genetic algorithm

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Embodiment Construction

[0037] The technical solutions of the present invention will be further described below through embodiments in conjunction with the accompanying drawings.

[0038] The invention adopts a widely used PID controller on the DCS layer for the main steam temperature system of the ultra-supercritical unit, and the parameter set of the PID controller in the sub-load section is obtained through an improved genetic algorithm optimization.

[0039] A kind of PID control method of main steam temperature of ultra-supercritical unit based on improved genetic algorithm proposed by the present invention, the specific steps of its improved genetic algorithm optimization are as follows:

[0040] Step1: Establish the mathematical model of PID parameter tuning problem, including objective function and constraints;

[0041] Step2: Set genetic parameters, including population size, evolutionary algebra, selection pressure, crossover probability range, and mutation probability range;

[0042] Step...

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Abstract

The invention relates to a main steam temperature PID (Proportion Integration Differentiation) control method of an ultra supercritical unit for boiler power generation in a thermal power plant based on an improved genetic algorithm. The method comprises the improved genetic algorithm. The improved genetic algorithm is improved on the basis of a simple genetic algorithm, optimal sequencing retaining selection, non-uniform linear intersection and Gauss mutation operators are introduced, a uniform design method is adopted to construct an initial population, and the intersection and variation probability is adjusted by Sigmoid function adaptability; and a PID controller orienting a DCS (distributed control system) is adopted, and the parameter set of the controller under a part load section is optimally obtained through the improved genetic algorithm. The optimizing speed and precision of the genetic algorithm are improved, the control method can replace an engineering adjusting method with complex engineering and low accuracy, the workload of on-site debugging personnel is reduced, the purpose of intelligent main steam temperature control is achieved, the application of an intelligent optimization technology under the DCS is realized, and the need of stably controlling the main steam temperature of the ultra supercritical unit in deep peak regulation is met.

Description

technical field [0001] The invention relates to a PID control method for the main steam temperature of a boiler generator set in a thermal power plant, in particular to a PID control method for the main steam temperature of an ultra-supercritical unit for boiler power generation in a thermal power plant based on an improved genetic algorithm. Background technique [0002] The main steam temperature of the boiler generator set in a thermal power plant is an important parameter to be monitored in the operation of a once-through boiler, which has complex dynamic and static characteristics and a wide range of influencing factors. For the main steam temperature control under the disturbance of water spray desuperheating, the practical application of power plants usually adopts the cascade PID control strategy with feed-forward compensation, which does not fully consider the influence of model changes when the load changes, and manual operation is required when the working conditio...

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Application Information

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IPC IPC(8): F22B35/00G05B11/42
Inventor 陈世和易凤飞韩玲方彦军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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