203results about How to "Improve adjustment quality" patented technology

The invention discloses an all-process control method for the main steam temperature of a utility boiler. The all-process control method comprises the following steps: firstly, partitioning the typical working condition points of the operation of the utility boiler; secondly, testing the main steam temperature mathematical models at the typical working condition points; thirdly, caculating the optimal values of PID (Proportion Integration Differentiation) adjustable parameters at the typical working condition points; fourthly, utilizing a piecewise linear function module in a DCS (Decentralized Control System) to achieve control logical configuration; fifthly, realizing the approximate optimal control of the main steam temperature at any working condition points in the DCS. The all-process control method for the main steam temperature of the utility boiler has the benefits that automatic dispatching of the optimal values of PID adjustable parameters of the inner loop and the outer loop is guaranteed when the main steam temperature system of a thermal power generating unit is within the full-load range of the unit operation, the main steam temperature adjustment quality is greatly improved, and the over-temperature probability of the unit under the condition of great load changes is lowered.

The invention belongs to the technical field of energy conservation of a central air-conditioning system, and particularly relates to a control method for optimizing cooling water flow of total energy consumption of a refrigeration apparatus and a cooling water pump. The method comprises the following steps: signal acquisition, signal treatment and conversion, primary control operation, secondary control operation, controlled quantity output and control of task execution. in the method, partial derivative of total power of the refrigeration apparatus and the cooling water pump to condensing pressure is taken as a parameter that represents whether the total power is in an approximately optimal sate or not, and the partial derivative of the total power of the refrigeration apparatus and the cooling water pump to the condensing pressure is calculate online by acquiring the parameter of the condensing pressure and parameters of temperature and flow rate of cooling water, and the flow rate of the cooling water is controlled according to the value of the partial derivative, thereby realizing that the total power of the refrigeration apparatus and the cooling water pump approaches minimum, at the time, the value of the partial derivative is close to zero, so that energy conservation effect of variable flow of the cooling water can be played to the utmost extent.

The invention relates to the technical field of parameter optimization of a PID (proportional-integral-derivative) controller, in particular to a method of parameter optimization of a speed regulating system of a water turbine based on satisfying control, belonging to the technical field of parameter optimization of the PID controller; the invention collects the performance indexes of rising time, overshoot, adjusting time and steady state error which are responded by the water turbine system according to the data which is required by the specific performance indexes of the water turbine system; then a satisfaction function of all the performance indexes can be obtained; the actual operation results of the system are taken as the standard to design and optimize the parameter of the controller; a genetic algorithm model which takes the total satisfaction function of the system performance indexes as fitness is established; the method of parameter optimization of the speed regulating system of the water turbine based on satisfying control is proposed by the simulation, contrast and analysis of three parameter optimization design methods and the total satisfaction meets the PID parameter which is required by the design; although the system designed by the invention does not have the necessity of operating in the optimized working condition, the actual requirement can be met better, and the cost of optimization can be reduced greatly, therefore, the invention has practicability and is easy to realize.

The present invention is limit load regulating method and apparatus for hydraulic bull dozer. The present invention features that by means of connecting the throttle valve sensor, the engine rotation speed sensor, walking motor rotation speed sensor and motor proportion valve to the micro controller (MC), connecting the engine to variable displacement oil pump and MC, the calculation in MC of the difference between practical rotation speed and the set value of the engine and the motor based on the signals from the sensors, the data processing and PID operation, the limit load regulating apparatus regulates the current of the electric proportion valve in the variable displacement oil pump and the current of the electric proportion valve in the motor to maintain the rotation speed of the engine in the constant value. The present invention makes the hydraulic bull dozer operate in optimal rotation speed with less fluctuation in high response speed.

The invention discloses a multi-model disturbance estimation predictive-control method for superheated steam temperature of a thermal power generating unit. According to the method, a superheated steam temperature system serves a controlled object, cooling spray water flow serves as system control input, superheated steam temperature serves as system output, a plurality of disturbance models are established to respectively expand the system state on the basis of a controlled object state space model, and a disturbance model set is formed. Sub-models in the disturbance model set are subjected to weighted averaging, thus the influence of immeasurable disturbance upon the system output is fitted. According to the concept of predictive control, optimization solution is performed once for each step so that optimal system controlled input is obtained. Compared with common predictive control algorithms, the method has the advantages that immeasurable disturbance can be inhibited more effectively, and steam temperature is kept around a set value stably; when no immeasurable disturbance occurs, the method is as effective as the common predictive control algorithms, and tracking regulation performance is fine.

The invention provides a method for automatically controlling a motor-driven feed-water pump. The method comprises the following steps: reading the actual rotating speed value and instruction value of the motor-driven feed-water pump; processing the actual rotating speed value of the motor-driven feed-water pump on a non-linear basis, and carrying out the subtraction operation on the processed actual rotating speed value and the instruction value of the motor-driven feed-water pump, so as to obtain the deviation value of the two values; or alternatively, processing the instruction value of the motor-driven feed-water pump on a non-linear basis, and carrying out the subtraction operation on the processed instruction value and the actual rotating speed value of the motor-driven feed-water pump, so as to obtain the deviation value of the two values; and processing the deviation value by carrying out the scaling operation, integral operation and differential regulation operation, and controlling the opening degree of a scoop tube of an electro-hydraulic coupler of the motor-driven feed-water pump by the processed deviation value. The invention can effectively regulate the rotating speed of the motor-driven feed-water pump, avoid scrambling for water when the motor-driven feed-water pump and turbine-driven feed-water pump are in parallel operation and improve the regulation quality and service efficiency of the automatic feed-water regulating system. The invention further discloses a system for automatically controlling the motor-driven feed-water pump.

An energy balance-based control method of main steam pressure of a supercritical CFB (circulating fluidized bed) boiler includes the steps: S1, after a main steam pressure deviation signal P<T>-P<TS> of a unit is regulated by a PID (proportion integration differentiation) regulator, a signal A is output; S2: a steam turbine demanded heat signal is acquired through a steam turbine energy demand model; S3, a heat signal provided by boiler energy is acquired through an instant carbon mechanism model; S4, subtracting the steam turbine demanded heat signal E<R> by the heat signal E provided by boiler energy is performed, regulating is performed with the PID regulator, and a signal C is output; S5, after subjected to time differentiation, the steam turbine demanded heat signal E<R> is multiplied by a proportional gain k so as to obtain an output signal B, and a sum of the signals B, A and C is output to a boiler master controller; S6, coal feed is regulated according to master control output of a boiler so as to control the main steam pressure. The method has the advantages that regulating quality of the unit can be improved, stability of a main steam pressure control system of the supercritical CFB boiler is improved and ability to respond to load response of the unit is satisfied.