Temperature cascade PID (Proportion Integration Differentiation) control system of high-temperature high-pressure testing device and control method thereof

Abstract

The invention relates to a temperature cascade PID (Proportion Integration Differentiation) control system of a high-temperature high-pressure testing device and a control method thereof. A high-temperature autoclave for test is used for simulating the temperature, the pressure and other parameters of a stratum environment and carrying out detection test on performances of an instrument working in an environment similar to the stratum environment. The temperature cascade PID control system comprises a hot air mixed heating module, a heating power supply module, a fan circulating module and a temperature measurement and control module; a heating area of the hot air mixed heating module is divided into three temperature measurement areas, i.e. a target temperature measurement area, a safetytemperature measurement area and a hearth temperature measurement area; the target temperature of which an output signal is transmitted to an inner ring auxiliary control PID control circuit after operated and processed through an outer ring main control PID control circuit is compared with a safety temperature for operation processing, and the output signal is amended by a temperature control coefficient and converted into a simulation control signal which is output to a power adjusting device for adjusting the output power of the heating power supply. Three temperature control areas in the invention realize the accurate control on the test temperature in the autoclave by using a cascade control method according to the requirement of a process curve of raising, preserving and reducing the temperature.

Description

technical field [0001] The invention relates to a temperature cascaded PID control system of a high-temperature and high-pressure test device and a control method thereof, and mainly aims at the special process requirements for temperature control of a high-temperature autoclave heated by electric hot air, and proposes a temperature cascade PID control method. Background technique [0002] The high temperature and autoclave used for the test is used to simulate the temperature, pressure and other parameters of the formation environment, and to test the performance of the instruments working in the similar formation environment. It is widely used in petroleum, chemical industry, coal, weapons, aerospace and other fields. Most of the existing test devices use induction heating or forced circulation heating with similar heat transfer oil as the heat transfer medium. Due to the limitation of the heating principle, the former can only cool down naturally, with low efficiency and l...

AI Technical Summary

Problems solved by technology

Most of the existing test devices use induction heating or forced circulation heating with similar heat transfer oil as the heat transfer medium. Due to the limitation of the heating principle, the former can only cool down naturally, with low efficiency and limited application range, while the latter heating The equipment is complicated, the cost of operation and management is high, and the safety and environmental performance is poor. At the same time, it is limited by the principle of heat transfer and heat transfer medium, and it also has the disadvantages of long test time and low test temperature.

For the special process requirements of high temperature and autoclave temperature control with electric hot air heating, it is difficult to control the heating and cooling speed with conventional control methods, and the stability is poor, and it is difficult to achieve the expected control goals

Images