Patent KR-101369780-B1 (KR)
Title: Sensorless variable flow rate control apparatus of pump using context aware algorithm and cotrol method thereof
Inventor: RYU HAE SUNG
IPC: F04D27/00
Filed: 2013-06-13
Granted: 2014-03-06
Abstract: The present invention relates to a device and a method for recognizing and storing a variable flow rate and controlling a pump by utilizing information about the pump to be controlled and real-time information generated by an inverter so as to provide optimal service for a user by storing and utilizing the environment and change of a cooling/heating system. Particularly, the present invention relates to a sensorless variable flow rate pump control method using axle power data generated by an inverter without installing a terminal differential pressure sensor, reducing the rotational rate of the pump if predicting the decrease of load in a pipe using a context-aware algorithm, increasing the rotational rate of the pump if predicting the increase of load in the pipe the other way around, and using the context-aware algorithm composed to include an inverter integrated with a controller and a motor equipped with a sensorless variable flow rate pump control technique capable of controlling the variable flow rate stably; and a control method using the same. The sensorless variable flow rate pump control device using the context-aware algorithm and the control method using the same according to the present invention reduces initial investment costs and maintenance costs because the sensorless variable flow rate pump control device does not need a differential pressure sensor or a control device other than the inverter integrated with a controller and a motor, and can control the pump more stably than an existing control technique depending the reliability of sensor measurement values. The sensorless variable flow rate pump control technique using the context-aware algorithm is effective in increasing, stably at low costs, the efficiency of using district heating compact units and general cooling/heating circulation pumps. [Reference numerals] (AA) Start; (B1) First - first step; (B2) Pump maneuver; (C1) First - second step; (C2) N rpm = Initial rotating number of an inverter; (DD) First step; (EE) First - third step; (F1) First - fourth step; (F2) Target rotating number of the inverter = N rpm; (F3) Target rotating number of the inverter = N+Δn rpm; (F4) Target rotating number of the inverter = N-Δn rpm; (G1) First - fifth step; (G2) nN : Current rotating number of the inverter; (H1) Modify the current rotating number of the inverter; (H2) Target rotating number of the inverter = nN; (H3) First - sixth step; (I1) Second - first step; (I2) A : Axial power of the inverter; (J1) Second - second step; (J2) N rpm power data = A; (J3) N+ Δn rpm power data =A; (J4) N- Δn rpm power data =A; (KK) Second step; (LL) Second - third step; (N1) Third - first step; (N2) N rpm power data <=N-Δn rpm power data; (OO) Third step; (P1) Third - second step; (P2) N rpm power datra <=N+Δn rpm power data; (P3) N rpm power data =>N+Δn rpm power data; (Q1) Fourth - first step; (Q2) Reference-changing rotating number = +k rpm; (Q3) Reference-changing rotating number = 0; (Q4) Reference-changing rotating number = - k rpm; (RR) Fourth step; (S1) Fourth - second step; (S2) N rpm=N rpm + Reference-changing frequency