CN103047075B - Ocean current energy power generation device and control method thereof - Google Patents
Ocean current energy power generation device and control method thereof Download PDFInfo
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Abstract
The invention relates to an ocean current energy power generation and a control method thereof. The ocean current energy power generation comprises an impeller, a first variable-displacement hydraulic pump directly driven by the impeller and a controller, an inlet of the first variable-displacement hydraulic pump is connected with an inlet of a variable-displacement hydraulic motor via a first one-way way, the variable-displacement hydraulic motor is provided with a first output shaft and a second output shaft, the first output shaft is connected with a spindle of an engine, the second output shaft is connected with a spindle of a second variable-displacement hydraulic pump, an outlet of the second variable-displacement hydraulic pump is connected with the inlet of the variable-displacement hydraulic motor via a second one-way valve, the second variable-displacement hydraulic pump and the variable-displacement hydraulic motor form an oil liquid circulation loop, and the controller sends displacement control signals for the first variable-displacement hydraulic pump, the second variable-displacement hydraulic pump and the variable-displacement hydraulic motor. By the aid of a hydraulic transmission mode, impact of ocean current flow velocity fluctuation on a system is low, and maximum power tracking control of the impeller and constant-frequency output control of a generator can be achieved.
Description
Technical field
The present invention relates to a kind of ocean current energy generator and controlling method thereof.
Background technique
At present, country vigorously advocates the clean renewable energy sources of development, energy by ocean current become i.e. wind energy, solar energy after the field of another primary study, it has the advantages such as energy density is high, predictability is strong.Ocean current energy generator from net type can solve the problem of island with power difficulty, has very large realistic meaning and researching value.Similar with wind energy conversion system, ocean current energy generator also exists front end wheel speed and the unmatched phenomenon of rear end generator rated speed, therefore needs energy transferring that impeller catches by a transmission system to generator.Transmission system directly has influence on performance and the efficiency of whole ocean current energy generator.
Traditional transmission system is generally a step-up gear.The advantage of gearbox drive has very high mechanical efficiency, and its mechanical efficiency is generally more than 95%.Similar with wind energy conversion system, the energy that ocean current energy generator is caught fluctuates along with the fluctuation of ocean current flow velocity, and the moment of torsion of gear-box transmission also changes thereupon, and gear-box long-term work, under alternate load, is easy to fatigue ruption occurs.According to statistics, gearbox fault occupies very large ratio in wind energy conversion system fault.For the deficiency that conventional gearbox exists, propose hydraulic transmission, fundamentally solve the problem of gear-box fatigue failure.Hydraulic transmission has higher flexibility, can catch the fluctuation of energy by buffering impeller, can realize stepless change simultaneously.
Desirable ocean current energy generator Hydraulic Power Transmission System can realize the control of two aspects, and one is that impeller maximum energy capture controls, and two is generator constant speed controls.Impeller maximum energy capture controls to refer to: along with the change of ocean current flow velocity, for the impeller that a geometrical construction is constant, all the time there is an optimum tip-speed ratio, when impeller is operated in optimum tip-speed ratio, its energy capture efficiency is maximum, control the rotating speed of impeller, make impeller follow the tracks of optimum tip-speed ratio under the ocean current flow velocity that vary, be maximum energy capture and control.Generator constant speed control refers to: generator speed does not change with the size variation of load, always works in the rated speed of generator.
Publication number is the patent of invention of CN101350589, proposes a kind of based on hydraulicdriven current power generation speed-changing constant frequency method and device thereof.The essence of this system drags a variable displacement motor to realize stepless change, the impact brought by the press and flux pulsation of an accumulator absorption system by a variable displacement pump.The press and flux pulsation of system is mainly from two aspects, and one is the pulsation from variable displacement pump rotating speed, i.e. the change of wheel speed; Two is the inherent structures from positive displacement variable displacement pump, i.e. limited cavity volume.There is a natural angular frequency ω in the accumulator in system
a, system ripple frequency ω
smore close to ω
a, the effect of accumulator Absorbing Fluctuation is better; As system ripple frequency ω
saway from ω
atime, accumulator does not have the effect of Absorbing Fluctuation.The operating mode of ocean current energy generator reality is complicated, the pulsation of its system pressure is distributed on a wider frequency field, in some frequency ranges, the effect of the Absorbing Fluctuation that accumulator plays is very little, inevitably there is rigid impulse in the system that therefore this patent proposes, this is a large defect of this system.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of ocean current energy generator and controlling method thereof, adopt hydraulic transmission mode, the impact that the fluctuation of ocean current flow velocity brings system is little, and the constant frequency that can realize the control of impeller maximal power tracing and generator exports and controls.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
Ocean current energy generator, comprise the impeller being promoted rotation by ocean current, by the first volume adjustable hydraulic pump of impeller Direct driver, the entrance of the first volume adjustable hydraulic pump connects fuel tank, first variable delivery hydraulic delivery side of pump is through the entrance of the first one-way valve link variable oil hydraulic motor, the outlet of variable hydraulic motor connects fuel tank, variable hydraulic motor has the first output shaft and the second output shaft, described first output shaft connects the main shaft of generator, the output terminal of this generator connects load, described second output shaft connects the main shaft of the second volume adjustable hydraulic pump, the entrance connected tank of the second volume adjustable hydraulic pump, second variable delivery hydraulic delivery side of pump connects the entrance of variable hydraulic motor through the second one-way valve, second volume adjustable hydraulic pump and variable hydraulic motor form the oil circulation loop that Absorbable rod system is pulsed, the flow transducer measuring ocean current flow velocity is equipped with at described impeller place, the main shaft that impeller is connected with the first volume adjustable hydraulic pump is equipped with the first speed probe, the hydraulic pipe line of variable hydraulic motor entrance is equipped with pressure transducer, the second speed probe the main shaft of generator is equipped with, described flow transducer, first speed probe, pressure transducer, the signal of the second speed probe collection is all transferred to controller, controller sends the displacement control signal of the first volume adjustable hydraulic pump, the displacement control signal of the second volume adjustable hydraulic pump, and the displacement control signal of variable hydraulic motor.
Further, the entrance pipe of described variable hydraulic motor is connected with accumulator through cut-off.Accumulator can absorption system medium frequency close to the pulsation of accumulator natural angular frequency, make hydraulic system keep stable.
Further, the entrance pipe of described variable hydraulic motor is connected with relief valve.Can initialization system pressure by relief valve, when system pressure is too high, can relief valve release portion hydraulic oil be passed through, make system pressure value maintain the setting oil pressure relief value of relief valve, avoid that system pressure is too high causes damage to system.
The controlling method of above-mentioned ocean current energy generator:
1) countertorque suffered when the rotating speed of impeller depends on that ocean current is applied to the torque on impeller and drags the first volume adjustable hydraulic pump, current flow velocity signal is transferred to controller by described flow transducer, controller obtains the best wheel speed that will realize needed for impeller maximum energy capture according to current ocean current flow relocity calculation, controller detects current wheel speed by the first speed probe and compared with best wheel speed, controller controls the first variable delivery hydraulic pump delivery according to the comparison value of current wheel speed and best wheel speed, thus change it and be applied to countertorque on impeller spindle, thus wheel speed is adjusted to best wheel speed, control to realize impeller maximum energy capture,
2) pressure transducer by the system current pressure Signal transmissions that collects to controller, system current pressure and the force value preset compare by controller, obtain the discharge capacity needed for variable hydraulic motor according to its mathematic interpolation, the discharge capacity regulating system pressure of controller controlled variable oil hydraulic motor is to the value preset; The current generator tach signal collected is transferred to controller by the second speed probe, current for generator rotating speed and generator rated speed compare by controller, controller controls the second variable delivery hydraulic pump delivery according to the comparison value of the current rotating speed of generator and generator rated speed, thus change it and be applied to moment on generator shaft, thus generator speed is adjusted to generator rated speed, to realize generator constant speed control.
The present invention is adopted to have following beneficial effect:
1, adopt hydraulic transmission, abandon the use of gear-box, fundamentally avoid the ocean current energy generator fault brought by gear-box fatigue failure, improve the reliability of system cloud gray model.
2, rotated by the main shaft of hydraulic system drive electrical generators, generator is without the need to being connected with electrical network, and therefore the present invention from network operation in island or remote districts, can solve local electrical problem, saves the cost of bulk power grid toward these regional laying-out transmissions of electricity.
3, achieve impeller maximum energy capture to control and generator constant speed control, improve the efficiency of system.
4, variable hydraulic motor and the second volume adjustable hydraulic pump form oil circulation loop, and can pulsing by absorption system in this oil circulation loop, reduces rigid impulse, make system keep stable.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the schematic diagram of embodiment of the present invention ocean current energy generator.
Fig. 2 is embodiment of the present invention impeller output power-rotation speed relation curve under different in flow rate.
Fig. 3 is the variable speed constant frequency control method schematic diagram of embodiment of the present invention ocean current energy generator.
Drawing reference numeral: 1-impeller; 2-first volume adjustable hydraulic pump; 3-first one-way valve; 4-stop valve; 5-accumulator; 6-relief valve; 7-second one-way valve; 8-second volume adjustable hydraulic pump; 9-variable hydraulic motor; 10-generator; 11-load; 12-controller; 13-fuel tank; 14-flow transducer; 15-first speed probe; 19-pressure transducer; 20-second speed probe.
Embodiment
Below in conjunction with accompanying drawing, invention is described further.
1, ocean current energy generator
As shown in Figure 1, ocean current energy generator, comprise the impeller 1 being promoted rotation by ocean current, by the first volume adjustable hydraulic pump 2 of impeller 1 Direct driver, the entrance of the first volume adjustable hydraulic pump 2 connects fuel tank 13, the outlet of the first volume adjustable hydraulic pump 2 is through the entrance of the first one-way valve 3 link variable oil hydraulic motor 9, the outlet of variable hydraulic motor 9 connects fuel tank 13, variable hydraulic motor 9 has the first output shaft and the second output shaft, described first output shaft connects the main shaft of generator 10, the output terminal of this generator 10 connects load 11, described second output shaft connects the main shaft of the second volume adjustable hydraulic pump 8, the entrance connected tank 13 of the second volume adjustable hydraulic pump 8, the outlet of the second volume adjustable hydraulic pump 8 connects the entrance of variable hydraulic motor 9 through the second one-way valve 7, second volume adjustable hydraulic pump 8 forms oil circulation loop with variable hydraulic motor 9, the stored energy that a part fluctuates by this oil circulation loop is in the fluid of circulation, thus reach the effect of absorption system pulsation, the flow transducer 14 measuring ocean current flow velocity is equipped with at described impeller 1 place, the main shaft that impeller 1 is connected with the first volume adjustable hydraulic pump 2 is equipped with the first speed probe 15, the hydraulic pipe line of variable hydraulic motor 9 entrance is equipped with pressure transducer 19, the second speed probe 20 main shaft of generator 10 is equipped with, described flow transducer 14, first speed probe 15, pressure transducer 19, the signal that second speed probe 20 gathers all is transferred to controller 12, controller 12 sends the displacement control signal of the first volume adjustable hydraulic pump, the displacement control signal of the second volume adjustable hydraulic pump, and the displacement control signal of variable hydraulic motor.
The entrance pipe of described variable hydraulic motor 9 is connected with accumulator 5 through stop valve 4.Accumulator 5 can absorption system medium frequency close to the pulsation of accumulator natural angular frequency, make hydraulic system keep stable.
The entrance pipe of described variable hydraulic motor 9 is connected with relief valve 6.Can initialization system pressure by relief valve 6, when system pressure is too high, can relief valve release portion hydraulic oil be passed through, make system pressure value maintain the setting oil pressure relief value of relief valve, avoid that system pressure is too high causes damage to system.
2, the working principle of ocean current energy generator:
Impeller 1 rotates under the effect of ocean current, the main shaft of the first volume adjustable hydraulic pump 2 is connected with impeller 1, the changes mechanical energy rotated by impeller 1 is the pressure energy of hydraulic oil liquid, and variable hydraulic motor 9 rotates under the effect of hydraulic oil liquid, the pressure energy of fluid is converted into the mechanical energy of main axis; When transforming the mechanical energy of coming and being greater than the rated power of generator 10, part mechanical energy is used to drawing generator 10 and generates electricity and be converted into electrical power storage in load 11 (in the present embodiment, load 11 is storage battery), it is the pressure energy of hydraulic oil liquid by changes mechanical energy again that unnecessary energy is used to dragging second volume adjustable hydraulic pump 8, the discharge capacity of the second volume adjustable hydraulic pump 8 regulates a suitable value by this Time Controller 12, the oil circulation loop Inner eycle that the unnecessary energy of system forms at variable hydraulic motor 9 and the second volume adjustable hydraulic pump 8; When system front end is caught by impeller and the energy being delivered to variable hydraulic motor 9 is less than the rated power of generator 10, the part energy stored in circulation loop by reduction second variable delivery hydraulic pump delivery, thus discharges and generates electricity in order to drawing generator by controller 12.Can pulsing by absorption system in the oil circulation loop that variable hydraulic motor 9 and the second volume adjustable hydraulic pump 8 form, reduces rigid impulse, makes system keep stable.
Countertorque suffered when the rotating speed of impeller 1 depends on that ocean current is applied to the torque on impeller 1 and drags the first volume adjustable hydraulic pump 2, current flow velocity signal is transferred to controller 12 by flow transducer 14, controller 12 obtains the best wheel speed that will realize needed for impeller maximum energy capture according to current ocean current flow relocity calculation, controller 12 detects current wheel speed by the first speed probe 15 and compared with best wheel speed, controller 12 controls the discharge capacity of the first volume adjustable hydraulic pump 2 according to the comparison value of current wheel speed and best wheel speed, thus change it and be applied to countertorque on impeller 1 main shaft, thus wheel speed is adjusted to best wheel speed, control to realize impeller maximum energy capture.
Pressure transducer 19 by the system current pressure Signal transmissions that collects to controller 12, system current pressure and the force value preset compare by controller 12, obtain the discharge capacity needed for variable hydraulic motor 9 according to its mathematic interpolation, the discharge capacity of controller 12 controlled variable oil hydraulic motor 9 thus regulating system pressure are to the value preset; The current generator tach signal collected is transferred to controller 12 by the second speed probe 20, current for generator rotating speed and generator rated speed compare by controller 12, controller 12 controls the discharge capacity of the second volume adjustable hydraulic pump 8 according to the comparison value of the current rotating speed of generator and generator rated speed, thus change it and be applied to moment on generator 10 main shaft, thus generator speed is adjusted to generator rated speed, to realize generator constant speed control.
In addition, main shaft due to generator is by hydraulic system driven rotary, and generator is without the need to being connected with electrical network, and therefore the present invention can from network operation in island or remote districts, solve local electrical problem, save the cost of bulk power grid toward these regional laying-out transmissions of electricity.
3, the controlling method of ocean current energy generator
1) impeller maximum energy capture controls
In horizontal axial type ocean current energy generator, the power that impeller is caught from seawater is:
Wherein, ρ is density of sea water, S be impeller sweep sectional area, v is ocean current flow velocity, C
pfor the power factor of impeller, P is the output power of impeller.
Be illustrated in figure 2 different ocean current flow velocity (as v
1-v
4) under impeller 1 output power P and wheel speed ω
brelation curve, corresponding each ocean current flow velocity has a maximum power point (as A
1-A
4), the maximum power point connecting these curves can obtain the peak output curve L of impeller 1.
On each point of peak output curve, the change of impeller 1 output power is zero relative to the variance ratio of wheel speed, now, and ocean current energy generator Maximum Power Output, that is:
As shown in Figure 2, by wheel speed ω
bbe adjusted to a certain particular value, the maximization that impeller 1 catches power can be realized.In order to realize this goal, the present invention is by the discharge capacity D of adjustment first volume adjustable hydraulic pump 2
optchange Hydraulic Power Transmission System load characteristic, and then regulate wheel speed ω
bfollow the tracks of optimum speed ω
opt, thus make impeller 1 realize maximum energy capture.
Formula (3) is the torque balance equation of impeller 1 main shaft,
T
p＝D
p1P
p (4)
Wherein, T is impeller torque, T
ffor Coulomb friction moment, B
p1for viscous damping coefficient, ω
bfor wheel speed, T
pbe the anti-torque of the first volume adjustable hydraulic pump, J
tfor conversion is to the equivalent moment of inertia on impeller spindle, t is the time, D
p1be the first variable delivery hydraulic pump delivery, p
pit is the outlet pressure of the first volume adjustable hydraulic pump 2.
As can be seen from formula (3), (4), by regulating the discharge capacity D of the first volume adjustable hydraulic pump 2
p1, the first volume adjustable hydraulic pump 2 can be changed and act on anti-torque T on impeller 1 main shaft
p, thus wheel speed ω can be regulated
b, make it operate in best wheel speed ω
opt, the maximum energy capture reaching impeller 1 controls.
2) generator constant speed control
First output shaft of variable hydraulic motor 9 is connected with generator 10 by the present embodiment, the second output shaft of variable hydraulic motor 9 is connected with the main shaft of the second volume adjustable hydraulic pump 8, to realize the constant speed control of generator 10, the torque equation on the second volume adjustable hydraulic pump 8, variable hydraulic motor 9 and generator 10 main shaft is:
Wherein, D
mfor the discharge capacity of variable hydraulic motor 9, D
p2be the discharge capacity of the second volume adjustable hydraulic pump 8, P
mfor the inlet pressure of variable hydraulic motor 9, T
lfor the equivalent load of generator 10, B
p2for viscous damping coefficient, ω
mfor generator 10 spindle speed, J
mfor conversion is to the equivalent moment of inertia on main shaft, t is the time.
When generator speed is constant, namely
following equation is had to set up according to formula (5):
(D
M-D
p2)P
M-T
L＝B
P2ω
M (6)
Conversely, the discharge capacity of controlled variable oil hydraulic motor 9 and the second volume adjustable hydraulic pump 8 makes formula (6) set up, and can control generator 10 invariablenes turning speed.As the equivalent load T of generator
lchange or the inlet pressure P of variable hydraulic motor 9
mduring fluctuation, the discharge capacity that can calculate variable hydraulic motor 9 and the second volume adjustable hydraulic pump 8 according to formula (6) is poor:
Therefore the discharge capacity of Moderator Variable oil hydraulic motor 9 and the second volume adjustable hydraulic pump 8 makes its difference for (D respectively
m-D
p2), just can regulator generator rotating speed keep constant.
Comprehensive 1), 2) 2 points, impeller maximum energy capture, generator constant speed control strategy that the present embodiment ocean current energy generator adopts can represent with the schematic diagram shown in Fig. 3.
In Fig. 3, the energy capture characteristic of impeller 1, generator rated speed ω
rand system design temperature P
0all known and be set in controller 12, controller 12 has 4 road input signals, respectively from flow transducer 14, first speed probe 15, pressure transducer 19 and the second speed probe 20, controller 12 has 3 tunnel output signals, control the discharge capacity of the first volume adjustable hydraulic pump 2, second volume adjustable hydraulic pump 8 and variable hydraulic motor 9 respectively, controller 12 obtains best wheel speed o according to the energy capture property calculation of the ocean current flow velocity v collected and impeller 1
ptt, more best wheel speed ω
optthe wheel speed ω fed back with the first speed probe 15
bthe discharge capacity needed for the first volume adjustable hydraulic pump 2 is calculated according to its deviation, controller changes the discharge capacity of the first volume adjustable hydraulic pump 2 by becoming discharge capacity actuator, and then change it and be applied to countertorque on impeller spindle, indirectly regulate the rotating speed of impeller 1, until it reaches best wheel speed, thus realize the control of impeller maximum energy capture; Controller 12 is by generator rated speed ω
rthe generator speed ω fed back with the second speed probe 20
mcompare, obtain rotating speed deviation, by system design temperature P
0the inlet pressure P of the variable hydraulic motor 9 fed back with pressure transducer 19
mcompare, obtain pressure divergence, controller 12 calculates the discharge capacity D of variable hydraulic motor 9 according to these two deviations
mwith the discharge capacity D of the second volume adjustable hydraulic pump 8
p2, formula (6) is set up all the time, and makes system pressure keep stable, namely realize generator constant speed control, and system is without impact.
Above-described embodiment is only enumerating of the technology of the present invention design way of realization; protection scope of the present invention is not limited only to above-described embodiment, and protection scope of the present invention may extend to those skilled in the art according to the thinkable equivalent technologies means of technical conceive of the present invention.
Claims (4)
1. ocean current energy generator, it is characterized in that: comprise the impeller (1) being promoted rotation by ocean current, by first volume adjustable hydraulic pump (2) of impeller (1) Direct driver, the entrance of the first volume adjustable hydraulic pump (2) connects fuel tank (13), the outlet of the first volume adjustable hydraulic pump (2) is through the entrance of the first one-way valve (3) link variable oil hydraulic motor (9), the outlet of variable hydraulic motor (9) connects fuel tank (13), variable hydraulic motor (9) has the first output shaft and the second output shaft, described first output shaft connects the main shaft of generator (10), the output terminal of this generator (10) connects load (11), described second output shaft connects the main shaft of the second volume adjustable hydraulic pump (8), the entrance connected tank (13) of the second volume adjustable hydraulic pump (8), the outlet of the second volume adjustable hydraulic pump (8) connects the entrance of variable hydraulic motor (9) through the second one-way valve (7), second volume adjustable hydraulic pump (8) and variable hydraulic motor (9) form the oil circulation loop that Absorbable rod system is pulsed, the flow transducer (14) measuring ocean current flow velocity is equipped with at described impeller (1) place, the main shaft that impeller (1) is connected with the first volume adjustable hydraulic pump (2) is equipped with the first speed probe (15), pressure transducer (19) hydraulic pipe line of variable hydraulic motor (9) entrance is equipped with, the second speed probe (20) main shaft of generator (10) is equipped with, described flow transducer (14), first speed probe (15), pressure transducer (19), the signal that second speed probe (20) gathers all is transferred to controller (12), controller (12) sends the displacement control signal of the first volume adjustable hydraulic pump, the displacement control signal of the second volume adjustable hydraulic pump, and the displacement control signal of variable hydraulic motor.
2. ocean current energy generator as claimed in claim 1, is characterized in that: the entrance pipe of described variable hydraulic motor (9) is connected with accumulator (5) through stop valve (4).
3. ocean current energy generator as claimed in claim 1 or 2, is characterized in that: the entrance pipe of described variable hydraulic motor (9) is connected with relief valve (6).
4. control the method for ocean current energy generator as claimed in claim 1, it is characterized in that:
1) countertorque suffered when the rotating speed of impeller (1) depends on that ocean current is applied to the torque on impeller (1) and drags the first volume adjustable hydraulic pump (2), current flow velocity signal is transferred to controller (12) by described flow transducer (14), controller (12) obtains the best wheel speed that will realize needed for impeller maximum energy capture according to current ocean current flow relocity calculation, controller (12) detects current wheel speed by the first speed probe (15) and compared with best wheel speed, controller (12) controls the discharge capacity of the first volume adjustable hydraulic pump (2) according to the comparison value of current wheel speed and best wheel speed, thus change it and be applied to countertorque on impeller (1) main shaft, thus wheel speed is adjusted to best wheel speed, control to realize impeller maximum energy capture,
2) pressure transducer (19) by the system current pressure Signal transmissions that collects to controller (12), system current pressure and the force value preset compare by controller (12), obtain the discharge capacity needed for variable hydraulic motor (9) according to its mathematic interpolation, the discharge capacity of controller (12) controlled variable oil hydraulic motor (9) thus regulating system pressure are to the value preset; The current generator tach signal collected is transferred to controller (12) by the second speed probe (20), current for generator rotating speed and generator rated speed compare by controller (12), controller (12) controls the discharge capacity of the second volume adjustable hydraulic pump (8) according to the comparison value of the current rotating speed of generator and generator rated speed, thus change it and be applied to moment on generator (10) main shaft, thus generator speed is adjusted to generator rated speed, to realize generator constant speed control.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6248017B2 (en) * | 2014-09-12 | 2017-12-13 | 三菱重工業株式会社 | Start-up method and start-up control device for ocean current power generator |
| CN106438186A (en) * | 2016-12-26 | 2017-02-22 | 江苏海事职业技术学院 | Vertical shaft tidal current energy power generation device based on tidal current shear-line characteristics |
| CN108331704B (en) * | 2018-02-13 | 2023-12-26 | 佛山科学技术学院 | Horizontal opposite double-turbine hydraulic transmission type ocean current energy power generation system |
| CN108915942A (en) * | 2018-07-16 | 2018-11-30 | 山东大学 | A kind of energy storage type hydraulic Wave energy generating system and its working method |
| CN109253040A (en) * | 2018-11-13 | 2019-01-22 | 大连海事大学 | A kind of high efficiency raft formula wave energy generating set |
| DE102018219711A1 (en) * | 2018-11-16 | 2020-05-20 | Siemens Aktiengesellschaft | Power supply system for a water-bound facility |
| CN113389764B (en) * | 2021-06-30 | 2022-11-15 | 四川航天烽火伺服控制技术有限公司 | Hydraulic equipment and turbo pump outlet pressure control system thereof |
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| JPH11287179A (en) * | 1998-03-31 | 1999-10-19 | Kayaba Ind Co Ltd | Generating set |
| CN2937535Y (en) * | 2006-07-18 | 2007-08-22 | 浙江大学 | Hydraulic underwater windmill generator |
| CN102011716A (en) * | 2010-12-03 | 2011-04-13 | 浙江大学 | Multi-energies hybrid power generating system |
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| JPH11287179A (en) * | 1998-03-31 | 1999-10-19 | Kayaba Ind Co Ltd | Generating set |
| CN2937535Y (en) * | 2006-07-18 | 2007-08-22 | 浙江大学 | Hydraulic underwater windmill generator |
| CN102011716A (en) * | 2010-12-03 | 2011-04-13 | 浙江大学 | Multi-energies hybrid power generating system |
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