Natural gas odorization control system and control method thereof

Abstract

The invention discloses a natural gas odorization control system and a control method thereof. The system comprises an odorization device unit, a detection unit, a power supply power unit, an MPC control unit and an upper computer; the control method adopts MPC optimization control, and the control method comprises system future dynamic prediction, rolling optimization, control quantity optimization and feedback correction. According to the invention, the blast constant temperature device is arranged in the natural gas pipeline, and THT and fuel gas which stay for a long time in the pipeline are fully mixed again by using the blast constant temperature device, so that the system predicted value error is reduced, a control strategy of a model prediction control algorithm is provided, and tracking performance and anti-interference performance tests are performed on the odorization control system; the mixing uniformity and anti-interference performance of THT and natural gas are improved, the robustness of the system is improved, the overall performance of the method is better than that of a control system based on PID and LQR algorithms, and the optimized MPC algorithm is better than a traditional MPC algorithm under an odorization control system.

Description

technical field [0001] The invention relates to the technical field of natural gas odorant concentration control, in particular to a natural gas odorization control system and a control method thereof. Background technique [0002] Odorization of gas is a process of frequent changes. It is a very challenging problem to realize the real-time control and optimization of odorant concentration under transient conditions. At present, the THT concentration of gas user terminals in my country's urban gas is unstable and not up to standard. It is of great significance to protect gas users and gas companies to ensure that the concentration of odorant at the gas user terminal is within the range of national standards. The traditional odorizing device nozzle device adopts a single mode and a single injection port, and the traditional odorization control The device does not consider the separation of THT and gas that were originally evenly mixed during the low-peak period of gas consumpti...

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Problems solved by technology

[0003] At present, most of the odorization control adopts the PID control algorithm. The PID control algorithm is a control method that is corrected according to the output feedback of the control object. Although PID, the classic control algorithm of PID, has a fast response speed and does not need an odorization control model, the environment in the odorization process is complex, the transmission pipeline is too long, and the control model has the characteristics of nonlinearity, large inertia, and hysteresis, so it is difficult for PID to meet the conditions. There is also an LQR algorithm that can control the process, but requires an accurate system model. The change in the pipeline over time, the temperature and pressure in the pipeline and other influencing factors will affect the model. The model parameters change slightly at any time, so it is difficult to guarantee The accuracy of the model, therefore, the present invention proposes a natural gas odorization control system and its control method to solve the problems in the prior art

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