非线性矿井通风网络的控制.docVIP

Nonlinear control of mine ventilation networks Yunan Hua,1 , Olga I. Koroleva b,*, Miroslav Krsticb Abstract:Ventilation networks in coal mines serve the critical task of maintaining a low concentration of explosive or noxious gases (e.g., methane). Due to the objective of controlling fluid flows, mine ventilation networks are high-order nonlinear systems. Previous efforts on this topic were based on multivariable linear models. The designs presented here are for a nonlinear model. Two control algorithms are developed. One employs actuation in all the branches of the network and achieves a global regulation result. The other employs actuation only in branches not belonging to the tree of the graph of the network and achieves regulation in a (non-infinitesimal) region around the operating point. The approach proposed for mine ventilation networks is also applicable to other types of uid networks like gas and water distribution networks, irrigation networks, and possibly to building ventilation. Keywords: Nonlinear control; Mine ventilation networks; Flow control; HVAC 1. Introduction Modern coal mines contain elaborate ventilation facilities that allow to regulate the concentration of methane. In such ventilation systems the objective is usually not to directly control the concentrations but to control the air flow rates through individual branches of the ventilation network. The actuation available ranges from a few fans/compressors strategically located through the network(and often directly connected to the outside environment), to actively controlled “doors” that are in many of the branches of the network. The problem of controlling mine ventilation received considerable attention in the 1970s and the 1980s. It is clear that a mine ventilation network is a multivariable control problem where acting in one branch can affect the flow in the other branches in an undesirable way. For this reason, mine ventilation needs to be approached in a model-based fashion, as a