| 摘要 |
The invention relates to a method for automatically controlling a flow in a flow line system including a flow line (3), a flow line inlet (1) and outlet (2), and a control valve (4) located in the flow line (3) at the outlet (2). The method includes the steps of: measuring or estimating an inlet pressure (PT1) or inlet flow rate (FT1) at the inlet (1), controlling the opening of the valve or choke (4) by means of a first control unit (8) comprising an automatic feedback controller, as a function of said measurements or estimates of the inlet pressure (PT1) and an inlet pressure set point, or the inlet flow rate (FT1) and an inlet flow rate set point. Said method is characterized in that it comprises the steps of: measuring or estimating an outlet fluid flow rate (FT2), and/or a pressure drop (dP) across the valve or choke, and/or a valve or choke opening at the outlet, automatically determining a value for the inlet pressure or the inlet flow rate set point in a second control unit (5) comprising an automatic feedback controller, as a function of said measurements or estimates of the outlet fluid flow rate (FT2) from the flow line (3), and/or a pressure drop (dP) across the valve or choke (4), and/or a valve or choke opening at the outlet, and - providing said inlet pressure or inlet flow rate set point to said first control unit (8). The invention also relates to a corresponding system. |
