CN110966138B - Safe and energy-saving hydraulic power generation system - Google Patents
Safe and energy-saving hydraulic power generation system Download PDFInfo
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- CN110966138B CN110966138B CN201911130396.0A CN201911130396A CN110966138B CN 110966138 B CN110966138 B CN 110966138B CN 201911130396 A CN201911130396 A CN 201911130396A CN 110966138 B CN110966138 B CN 110966138B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/26—Reciprocating-piston liquid engines adapted for special use or combined with apparatus driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/003—Reciprocating-piston liquid engines controlling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/003—Reciprocating-piston liquid engines controlling
- F03C1/004—Reciprocating-piston liquid engines controlling speed-control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to the technical field of hydraulic power generation, in particular to a safe and energy-saving hydraulic power generation system which comprises a hydraulic oil tank, a hydraulic pump, a proportional multi-way valve, an electric control unloading valve, a variable motor, a generator and a control system, wherein an oil delivery port is communicated with a high-pressure port of the proportional multi-way valve, a high-pressure oil output port of the proportional multi-way valve is communicated with a high-pressure oil port of the variable motor, an oil return port of the variable motor returns to the hydraulic oil tank after passing through an oil return port of the proportional multi-way valve, an output shaft of the variable motor is connected with an input shaft of the generator, a first pressure sensor, a second pressure sensor, a displacement sensor, a current sensor, a voltage sensor, a rotating speed sensor and a third pressure sensor of the control system are respectively connected with an input end of a controller, and an output end of the controller is connected with executing elements of the proportional multi-way valve, the electric control unloading valve and the variable motor. The system provided by the invention has the advantages of high response speed, stable transient power generation characteristic of the generator, safer hydraulic power generation system and power generation index meeting the requirement of high-precision power load.
Description
Technical Field
The invention relates to the technical field of hydraulic power generation, in particular to a safe and energy-saving hydraulic power generation system.
Background
Hydraulic power generation is a technology that converts mechanical energy into electrical energy by rotating a hydraulic motor to drive a generator to operate. The application of the hydraulic generator is based on a hydraulic system, the diversity of energy output forms of the hydraulic system is enriched, the blank that the hydraulic system cannot output electric energy is filled, the power density is greatly improved compared with a hydraulic generator of a fuel generator set, and the hydraulic generator is widely applied by virtue of the characteristics of small volume, light weight, high reliability and strong environmental adaptability.
At present, hydraulic power generation is applied to the fields of engineering machinery, rescue vehicles, railway transportation, airplanes, ships and the like, and the technical problems of low power generation power, poor sudden increase and decrease power generation indexes, poor no-load rotating speed stability, incapability of mutual conversion of alternating current and direct current and the like are solved by the conventional hydraulic power generator.
However, the existing hydraulic generator has the following disadvantages:
1. because the characteristic of the hydraulic system is that the system pressure is determined by the load with the highest pressure demand, in the hydraulic system with a single pump and multiple loads, due to the particularity of the electric load, the hydraulic generator is required to be in a state of idle running standby or low-power output under many conditions, and the pressure required by other loads is very high, at the moment, the hydraulic oil flowing through the hydraulic motor of the generator is still high-pressure hydraulic oil, and the hydraulic energy is not converted into electric energy to be provided for the electric load, so that the high-pressure hydraulic energy is converted into heat energy, the situation is not only great waste of energy, but also can cause the temperature of the hydraulic oil of the hydraulic system to be rapidly increased, and the service life of a hydraulic element is reduced. The defects of low energy conversion rate and large heat generation are still not effectively solved.
2. The existing hydraulic generator only carries out the setting of safety protection measures from the output end of the generator, for example, a breaker, a leakage protector, an insurance and the like are installed, the safety level of the safety protection measures is not enough, once the safety protection measures fail, the high voltage of the generator can bring great threat to the safety of personnel, and meanwhile, the equipment also faces the risk of damage.
3. The transient indexes of the existing hydraulic alternating-current generator during the sudden load increase and decrease are difficult to reach the standard of a shaft-belt direct-connection generator set product, and the defect that the use requirement of a high-precision power load cannot be met is difficult to overcome.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safe and energy-saving hydraulic power generation system which has high response speed, more stable transient power generation characteristics of a generator, higher safety of a hydraulic power generation system, greatly improved power generation indexes and capability of meeting the use requirements of high-precision power utilization loads.
The invention is realized by the following technical scheme:
a safe and energy-saving hydraulic power generation system comprises a hydraulic oil tank, a hydraulic pump, a proportional multi-way valve, an electric control unloading valve, a variable motor, a generator and a control system, wherein an oil suction port of the hydraulic pump is connected with the hydraulic oil tank through an oil suction pipeline, an oil delivery port of the hydraulic pump is communicated with a high pressure port of the proportional multi-way valve through a high pressure pipeline, the electric control unloading valve is installed between a high pressure oil output port of the proportional multi-way valve and a high pressure oil port of the variable motor, an oil return port of the variable motor returns to the hydraulic oil tank through an oil return pipeline after passing through an oil return port of the proportional multi-way valve, an output shaft of the variable motor is connected with an input shaft of the generator through a coupler, the control system comprises a controller, a first pressure sensor installed at the high pressure port of the variable motor, a second pressure sensor installed at the low pressure port of the variable motor, a displacement sensor installed in the variable motor, a current sensor installed in the generator, The hydraulic control system comprises a voltage sensor, a rotating speed sensor arranged at a coupler and a third pressure sensor arranged at a high-pressure port of a hydraulic pump, wherein the first pressure sensor, the second pressure sensor, a displacement sensor, a current sensor, the voltage sensor, the rotating speed sensor and the third pressure sensor are respectively connected with the input end of a controller through cables, and the output end of the controller is respectively connected with a proportional multi-way valve, an electric control unloading valve and an execution element of a variable motor through cables.
Further, the hydraulic pump is driven by the prime mover.
The invention has the advantages of
A safe and energy-saving hydraulic power generation system has the following advantages:
1. due to the characteristics of adjustable displacement and high response speed of the variable hydraulic motor and the like, the speed regulation control point of the generator can be directly changed from a control proportional valve or a hydraulic pump to a hydraulic motor closer to a load end, so that the generator is more convenient and faster, and has high response speed, and the transient power generation characteristic of the generator is more stable.
2. After the safety protection measures of the circuit system fail, the safety protection measures can still be effectively provided for personnel and equipment, so that the hydraulic power generation system has higher safety.
3. The power generation index is greatly improved, the use requirement of a high-precision power utilization load is met, and the use range of hydraulic power generation is wider.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the hydraulic principle of the present invention;
FIG. 3 is a schematic diagram of the control principle of the system of the present invention;
in the figure: 1. the variable displacement hydraulic motor comprises a variable displacement motor, 2 parts of a coupler, 3 parts of a generator, 4 parts of a first pressure sensor, 5 parts of a second pressure sensor, 6 parts of a displacement sensor, 7 parts of a current sensor, 8 parts of a voltage sensor, 9 parts of a rotating speed sensor, 10 parts of a third pressure sensor, 11 parts of a controller, 12 parts of an electric control unloading valve, 13 parts of a hydraulic pump, 14 parts of a hydraulic oil tank and 15 parts of a proportional multi-way valve.
Detailed Description
A safe and energy-saving hydraulic power generation system comprises a hydraulic oil tank 14, a hydraulic pump 13, a proportional multi-way valve 15, an electronic control unloading valve 12, a variable motor 1, a generator 3 and a control system, wherein an oil suction port of the hydraulic pump is connected with the hydraulic oil tank through an oil suction pipeline, an oil delivery port is communicated with a high pressure port of the proportional multi-way valve through a high pressure pipeline, the electronic control unloading valve is installed between a high pressure oil outlet of the proportional multi-way valve and a high pressure port of the variable motor, an oil return port of the variable motor returns to the hydraulic oil tank through an oil return pipeline after passing through an oil return port of the proportional multi-way valve, an output shaft of the variable motor is connected with an input shaft of the generator through a coupler 2, and the control system comprises a controller 11, a first pressure sensor 4 installed at the high pressure port of the variable motor, a second pressure sensor 5 installed at the low pressure port of the variable motor, a displacement sensor 6 installed in the variable motor, The hydraulic control system comprises a current sensor 7, a voltage sensor 8, a rotating speed sensor 9 and a third pressure sensor 10, wherein the current sensor 7 and the voltage sensor are installed in a generator, the rotating speed sensor 9 is installed at a coupler, the third pressure sensor 10 is installed at a high-pressure port of a hydraulic pump, the first pressure sensor, the second pressure sensor, the displacement sensor, the current sensor, the voltage sensor, the rotating speed sensor and the third pressure sensor are respectively connected with the input end of a controller through cables, and the output end of the controller is respectively connected with an execution element of a proportional multi-way valve, an electric control unloading valve and a variable motor through cables.
Further, the hydraulic pump is driven by the prime mover.
The working principle of the invention is as follows: the prime motor drives the hydraulic pump, the hydraulic pump absorbs oil from the hydraulic oil tank through the oil absorption pipeline, and the hydraulic pump absorbs the power of the prime motor and then transmits high-pressure hydraulic oil to a high-pressure port of the proportional multi-way valve group through the high-pressure pipeline. The proportional multi-way valve group distributes hydraulic oil to a high-pressure oil port of the variable motor of the generator according to working condition requirements to drive the variable motor to rotate, the variable motor drives the alternating current generator through the coupler, and the variable motor collects the hydraulic oil which has released pressure energy to an oil return port of the proportional multi-way valve group through a pipeline. The oil return port of the proportional multi-way valve group conveys hydraulic oil back to the hydraulic oil tank through an oil return pipeline to complete the circulation process of the hydraulic oil, so that the energy conversion of converting hydraulic energy into electric energy is realized.
The principle of the control system is as follows: the variable displacement hydraulic motor control system comprises a first pressure sensor, a second pressure sensor, a displacement sensor, a current sensor, a voltage sensor, a rotating speed sensor, a third pressure sensor and a controller, wherein the first pressure sensor is used for reading the pressure of a high pressure port of a variable motor, the second pressure sensor is used for reading the pressure of a low pressure port of the variable motor, the displacement sensor is used for reading the displacement of the variable motor, the current sensor is used for reading the output current of an alternating current generator, the voltage sensor is used for reading the output current of the alternating current generator, the rotating speed sensor is used for reading the rotating speed of the variable hydraulic motor, namely the rotating speed of the generator, the third pressure sensor is used for reading the pressure of a hydraulic system, and the controller is used for receiving the information of the sensors, comparing and controlling the operation of the system.
The energy-saving function is realized by that when a plurality of loads in a hydraulic system run simultaneously, the energy-saving function comprises a generator, a controller reads a variable motor high-pressure port pressure P1 through a first pressure sensor, reads a hydraulic system high-pressure P3 through a third pressure sensor, and compares the pressures, when P1 is lower than P3, the controller adjusts the variable motor to control the displacement of a current control variable motor to be reduced until P1 approaches P3, and the heating power at the moment is P (kilowatt) ═ P3-P1 × Q/60(Q is the flow passing through the variable motor), so that the heating power is extremely low because P1 approaches P3, and the energy-saving effect is achieved.
The realization principle of the safety function is as follows: the controller presets a power safety protection value P (preset) according to technical parameters of the generator, reads the pressure P1 of a variable motor high-pressure port through a first pressure sensor, reads the pressure P2 of the variable motor high-pressure port through a second pressure sensor, reads the rotating speed n of the variable motor through a rotating speed sensor, reads the displacement v of the variable motor through a displacement sensor, calculates the P (actual) as (P1-P2) v n/60 by using a formula, compares the P (actual) with the P (preset), and controls the opening of the electric control unloading valve to unload the variable motor when the P (actual) is higher than the P (preset), so that hydraulic oil crosses the variable motor and directly flows back to the oil return port of the multi-way valve bank. Thereby playing the role of safety protection. The protection function distinguishes the protection measures of the generator circuit, and can thoroughly cut off power output from an energy source, so that the safety protection measures of the system are further improved.
The control principle of the power generation transient index is as follows: the controller reads the output voltage of the generator through the voltage sensor, and reads the power generation speed and the frequency of the generator through the speed sensor. The read parameters are compared with preset parameters, when the output power of the generator is suddenly increased, the transient rotating speed of the generator is reduced to reduce the output voltage and the frequency, the displacement of the variable motor is controlled by the controller to reduce at the moment, so that the rotating speed of the generator is quickly recovered, when the output power of the generator is suddenly reduced, the transient rotating speed of the generator is increased to increase the output voltage and the frequency, and the displacement of the variable motor is controlled by the controller to increase at the moment, so that the rotating speed of the generator is quickly recovered. The speed regulation control point of the generator is directly changed from a control proportional valve or a hydraulic pump to a hydraulic motor closer to a load end, and the response speed is very high.
In conclusion, the safe and energy-saving hydraulic power generation system protected by the application has the advantages that the response speed is high, the transient power generation characteristic of the generator tends to be more stable, the hydraulic power generation system has higher safety, the power generation index is greatly improved, and the use requirement of a high-precision power utilization load is met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A safe and energy-saving hydraulic power generation system is characterized by comprising a hydraulic oil tank, a hydraulic pump, a proportional multi-way valve, an electric control unloading valve, a variable motor, a generator and a control system, wherein an oil suction port of the hydraulic pump is connected with the hydraulic oil tank through an oil suction pipeline, a high pressure port of the hydraulic pump is communicated with a high pressure port of the proportional multi-way valve through a high pressure pipeline, the electric control unloading valve is installed between a high pressure oil outlet of the proportional multi-way valve and a high pressure port of the variable motor, an oil return port of the variable motor returns to the hydraulic oil tank through an oil return pipeline after passing through an oil return port of the proportional multi-way valve, an output shaft of the variable motor is connected with an input shaft of the generator through a coupler, and the control system comprises a controller, a first pressure sensor installed at the high pressure port of the variable motor, a second pressure sensor installed at the low pressure port of the variable motor, a displacement sensor installed in the variable motor, The hydraulic control system comprises a current sensor, a voltage sensor, a rotating speed sensor and a third pressure sensor, wherein the current sensor and the voltage sensor are arranged in a generator, the rotating speed sensor is arranged at a coupler, the third pressure sensor is arranged at a high-pressure port of a hydraulic pump, the first pressure sensor, the second pressure sensor, the displacement sensor, the current sensor, the voltage sensor, the rotating speed sensor and the third pressure sensor are respectively connected with the input end of a controller through cables, and the output end of the controller is respectively connected with a proportional multi-way valve, an electric control unloading valve and an execution element of a variable motor through cables.
2. A safe and energy-saving hydraulic power generation system according to claim 1, wherein the hydraulic pump is driven by a prime mover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911130396.0A CN110966138B (en) | 2019-11-19 | 2019-11-19 | Safe and energy-saving hydraulic power generation system |
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| CN201911130396.0A CN110966138B (en) | 2019-11-19 | 2019-11-19 | Safe and energy-saving hydraulic power generation system |
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| CN110966138A CN110966138A (en) | 2020-04-07 |
| CN110966138B true CN110966138B (en) | 2021-10-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111980851B (en) * | 2020-08-17 | 2022-09-06 | 三一汽车制造有限公司 | Hydraulic power generation system and special vehicle |
| CN113202843A (en) * | 2021-06-11 | 2021-08-03 | 张向东 | Hydraulic power generation system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126369A (en) * | 2007-09-19 | 2008-02-20 | 丹纳森工程装备（杭州）有限公司 | Hydraulic pressure generating system |
| CN103779873A (en) * | 2014-01-14 | 2014-05-07 | 燕山大学 | Low-voltage ride-through control method for hydraulic wind generating set |
| CN105128662A (en) * | 2015-07-31 | 2015-12-09 | 燕山大学 | Hydraulic bridge crane generator energy-saving power generation system |
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2019
- 2019-11-19 CN CN201911130396.0A patent/CN110966138B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126369A (en) * | 2007-09-19 | 2008-02-20 | 丹纳森工程装备（杭州）有限公司 | Hydraulic pressure generating system |
| CN103779873A (en) * | 2014-01-14 | 2014-05-07 | 燕山大学 | Low-voltage ride-through control method for hydraulic wind generating set |
| CN105128662A (en) * | 2015-07-31 | 2015-12-09 | 燕山大学 | Hydraulic bridge crane generator energy-saving power generation system |
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