| CPC F15B 1/04 (2013.01) [F15B 13/06 (2013.01); F03B 13/14 (2013.01); F03B 13/189 (2013.01); F03B 13/22 (2013.01); F05B 2260/406 (2013.01); F15B 2201/51 (2013.01); Y02E 10/30 (2013.01)] | 2 Claims |
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1. An indirect hydraulic load hierarchical control method for a wave energy device, being used for an indirect hydraulic load hierarchical control system for the wave energy device, wherein the indirect hydraulic load hierarchical control system comprises:
a first hydraulic cylinder group, a second hydraulic cylinder group, a third hydraulic cylinder group, a high-pressure energy accumulator group, a pressure detection control module, a first hydraulic power generator set, a second hydraulic power generator set and a third hydraulic power generator set, wherein
an output end of the first hydraulic cylinder group is directly connected with an input end of the high-pressure energy accumulator group, an output end of the second hydraulic cylinder group and an output end of the third hydraulic cylinder group are connected with the input end of the high-pressure energy accumulator group and an oil return tank respectively through independent reversing valves, an output end of the high-pressure energy accumulator group is respectively connected with the first hydraulic power generator set, the second hydraulic power generator set and the third hydraulic power generator set through independent electromagnetic valves, a detection end of the pressure detection control module is used for acquiring an internal pressure of the high-pressure energy accumulator group, comparing the internal pressure with a preset pressure level, and respectively controlling the on-off of the reversing valves and the electromagnetic valves according to a comparison result, the reversing valves are used for controlling the second hydraulic cylinder group and the third hydraulic cylinder group to enter/exit an effective work state, and the electromagnetic valves are used for controlling the first hydraulic power generator set, the second hydraulic power generator set and the third hydraulic power generator set to enter/exit a power generation state; and
the indirect hydraulic load hierarchical control method comprising:
acquiring an internal pressure P of the high-pressure energy accumulator group in real time, and setting gradually increasing pressure values P1, P2, P3, P4, P5 and P6 and gradually increasing pressure values P21, P22, P31 and P32, wherein the following pressure relationships need to be met: P1<P21<P3<P31<P5 and P2<P22<P4<P32<P6;
the control method comprises a first mode, a second mode, a third mode, a fourth mode, and a fifth mode, and each mode may only be switched to an adjacent mode every time;
in the first mode, if P2≤P<P22, the second hydraulic cylinder group and the third hydraulic cylinder group are triggered to be connected to the oil return tank through the corresponding reversing valves, the electromagnetic valve corresponding to the first hydraulic power generator set is turned on, the electromagnetic valves corresponding to the second hydraulic power generator set and the third hydraulic power generator set are turned off, and after P2≤P<P22 is triggered, the electromagnetic valve corresponding to the first hydraulic power generator set is only allowed to be turned off only under the condition that P≤P1;
in the second mode, if P22≤P<P4, the second hydraulic cylinder group is triggered to be connected to the input end of the high-pressure energy accumulator group through the corresponding reversing valve, the third hydraulic cylinder group is connected to the oil return tank through the corresponding reversing valve, the electromagnetic valve corresponding to the first hydraulic power generator set is turned on, the electromagnetic valves corresponding to the second hydraulic power generator set and the third hydraulic power generator set are turned off, and after P22≤P<P4 is triggered, the second hydraulic cylinder group is only allowed to be controlled to be connected to the oil return tank through the corresponding reversing valve only under the condition that P≤P21;
in the third mode, if P4≤P<P32, the second hydraulic cylinder group is triggered to be connected to the input end of the high-pressure energy accumulator group through the corresponding reversing valve, the third hydraulic cylinder group is connected to the oil return tank through the corresponding reversing valve, the electromagnetic valves corresponding to the first hydraulic power generator set and the second hydraulic power generator set are turned on, the electromagnetic valve corresponding to the third hydraulic power generator set is turned off, and after P4≤P<P32 is triggered, the electromagnetic valve corresponding to the second hydraulic power generator set is only allowed to be turned off only under the condition that P≤P3;
in the fourth mode, if P32≤P<P6, the second hydraulic cylinder group and the third hydraulic cylinder group are triggered to be connected to the input end of the high-pressure energy accumulator group through the corresponding reversing valves, the electromagnetic valves corresponding to the first hydraulic power generator set and the second hydraulic power generator set are turned on, the electromagnetic valve corresponding to the third hydraulic power generator set is turned off, and after P32≤P<P6 is triggered, the third hydraulic cylinder group is only allowed to be controlled to be connected to the oil return tank through the corresponding reversing valve only under the condition that P≤P31; and
in the fifth mode, if P≥P6, the second hydraulic cylinder group and the third hydraulic cylinder group are triggered to be connected to the input end of the high-pressure energy accumulator group through the corresponding reversing valves, the electromagnetic valves corresponding to the first hydraulic power generator set, the second hydraulic power generator set and the third hydraulic power generator set are turned on, and after P≥P6 is triggered, the electromagnetic valve corresponding to the third hydraulic power generator set is only allowed to be turned off only under the condition that P≤P5.
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