<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The heating pipe network system with such dynamic characteristics as nonlinearity and large time lag may cause hydraulic disorder. To solve this problem, this paper proposes a unit control-based hydraulic equilibrium control strategy, which constructs an equilibrium regulation system for heating pipe networks by optimising the inlet device of each unit and using a novel control theory. By developing a cascade control system to control the return water temperature and the pressure difference between supply and return water of the branches at each unit of the pipe network, we were able to stabilise the pressure and control the temperature. Then, we used the averaging control theory to set the parameters of regulation systems between each unit. The research results indicate that, compared to the traditional single-loop negative-feedback return water temperature control system, the cascade averaging controller has a better control effect than the single-loop PID controller. This is because it has a smaller overshoot and can cope with system interference factors quickly. Therefore, the temperature of return water between each unit can be coordinated and fluctuation is within a smaller range. This effectively eliminates the influence of static and dynamic hydraulic disorder on entire system stability.</p>
</abstract>

The heating pipe network system with such dynamic characteristics as nonlinearity and large time lag may cause hydraulic disorder. To solve this problem, this paper proposes a unit control-based hydraulic equilibrium control strategy, which constructs an equilibrium regulation system for heating pipe networks by optimising the inlet device of each unit and using a novel control theory. By developing a cascade control system to control the return water temperature and the pressure difference between supply and return water of the branches at each unit of the pipe network, we were able to stabilise the pressure and control the temperature. Then, we used the averaging control theory to set the parameters of regulation systems between each unit. The research results indicate that, compared to the traditional single-loop negative-feedback return water temperature control system, the cascade averaging controller has a better control effect than the single-loop PID controller. This is because it has a smaller overshoot and can cope with system interference factors quickly. Therefore, the temperature of return water between each unit can be coordinated and fluctuation is within a smaller range. This effectively eliminates the influence of static and dynamic hydraulic disorder on entire system stability.

Research of cascade averaging control in hydraulic equilibrium regulation of heating pipe network

Applied Mathematics and Nonlinear Sciences

This work is licensed under the Creative Commons Attribution 4.0 International License.

The heating pipe network system with such dynamic characteristics as nonlinearity and large time lag may cause hydraulic disorder. To solve this problem, this...

Research of cascade averaging control in hydraulic equilibrium regulation of heating pipe network

Published Online: Oct 19, 2021

Page range: 685 - 702

Received: Apr 26, 2021

Accepted: Jul 23, 2021

DOI: https://doi.org/10.2478/amns.2021.2.00037

Keywords
heating pipe network, hydraulic disorder, cascade control system, averaging control

© 2021 Chunlei Liu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Research of cascade averaging control in hydraulic equilibrium regulation of heating pipe network

Published Online: Oct 19, 2021

Page range: 685 - 702

Received: Apr 26, 2021

Accepted: Jul 23, 2021

DOI: https://doi.org/10.2478/amns.2021.2.00037

Keywordsheating pipe network, hydraulic disorder, cascade control system, averaging control

© 2021 Chunlei Liu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
heating pipe network, hydraulic disorder, cascade control system, averaging control