CN113279912A - Control method of wind-heat unit energy system - Google Patents
Control method of wind-heat unit energy system Download PDFInfo
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- CN113279912A CN113279912A CN202110568698.7A CN202110568698A CN113279912A CN 113279912 A CN113279912 A CN 113279912A CN 202110568698 A CN202110568698 A CN 202110568698A CN 113279912 A CN113279912 A CN 113279912A
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- 238000010438 heat treatment Methods 0.000 claims description 7
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- 238000006243 chemical reaction Methods 0.000 abstract description 6
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- 238000012986 modification Methods 0.000 description 3
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- 241000282414 Homo sapiens Species 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
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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
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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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
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0236—Adjusting aerodynamic properties of the blades by changing the active surface of the wind engaging parts, e.g. reefing or furling
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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
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
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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
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/28—Wind motors characterised by the driven apparatus the apparatus being a pump or a compressor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a control method of an energy system of a wind-heat unit, wherein a wind turbine drives a compressor and a generator by one driving two, and the method comprises the following steps: s1: calculating rated rotating speeds of the compressor and the generator; s2: setting an energy system of the wind-heat machine set according to the rated rotating speed calculated in the S1; s3: judging the mode used in the current state, selecting the first mode for S4, and selecting the second mode for S5; s4: disconnecting a clutch connected between the wind turbine and the compressor, wherein the wind turbine preferentially drives the generator to work; s5: and (3) disconnecting the clutch connected between the wind turbine and the generator, wherein the wind turbine preferentially drives the compressor to work. The control method of the wind-heat unit energy system provided by the invention adopts one-driving-two wind turbines to drive the compressor and the generator, effectively reduces the energy conversion loss in the intermediate conversion process, controls the power distribution of the compressor and the generator according to the real-time wind speed and the requirements of users, and controls the wind-heat unit to achieve the highest utilization efficiency.
Description
Technical Field
The invention belongs to the field of control of a cogeneration system, and particularly relates to a control method of an energy system of a wind-heat unit.
Background
Energy is the basis of human survival and development, but with rapid development of economy, fossil energy consumption is continuously increased, human beings face increasingly serious energy shortage and environmental problems, and global warming becomes a hot spot of international concern. The development of clean energy has important significance for guaranteeing energy safety, promoting environmental protection, reducing greenhouse gas emission and realizing national economy sustainable development.
In recent years, new energy development and utilization technologies mainly based on solar energy, wind energy, geothermal energy and ocean energy have been rapidly developed. The wind power generation device is influenced by wind energy volatility and power grid capacity expansion, and the phenomenon of wind abandon and power limit in China is serious at present. In the field of non-electric heating, particularly in the aspects of building heat supply and industrial heat, the wind energy is directly converted into heat energy, so that the heating of clean energy can be realized, and the problem of wind energy consumption can be solved.
However, the wind-heat machine set is designed according to wind resource assessment of an installation place, the problem of building height limitation exists in partial areas, only the impeller of the fan can be reduced, wind energy capture of the wind machine is limited, and the heating requirement of a user is difficult to meet by a single wind-heat machine set. The ground source heat pump is a heat supply central air conditioning system which takes rock and soil mass, stratum soil, underground water or surface water as a low-temperature heat source and consists of a water ground source heat pump unit, a geothermal energy exchange system and a system in a building. However, in winter and summer in the north, the soil temperature is reduced due to unbalanced heat absorption and heat release of the ground source heat pump.
Therefore, it is necessary to provide a control method for an energy system of a wind turbine to solve the above problems.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for controlling an energy system of a wind turbine, where the energy system of the wind turbine includes a wind turbine, a compressor, and a generator, the wind turbine drives the compressor and the generator with one driving two, and the energy system of the wind turbine has a first mode and a second mode, and the method includes the following steps:
s1: calculating rated rotating speeds of the compressor and the generator;
s2: setting an energy system of the wind-heat machine set according to the rated rotating speed calculated in the S1;
s3: judging the mode used in the current state, selecting the first mode for S4, and selecting the second mode for S5;
s4: disconnecting a clutch connected between the wind turbine and the compressor, wherein the wind turbine preferentially drives the generator to work;
s5: and (3) disconnecting the clutch connected between the wind turbine and the generator, wherein the wind turbine preferentially drives the compressor to work.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that the wind turbine is provided with a first cut-in wind speed and a second cut-in wind speed; the first cut-in wind speed is for a single-belt generator and the second cut-in wind speed is for a single-belt compressor.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that the wind turbine is connected with a speed increasing box, the speed increasing box is provided with two output shafts, the two output shafts are respectively connected with the generator and the compressor, and the speed increasing ratio of the two output shafts is configured to ensure that the generator and the compressor simultaneously reach the highest rotating speed when the wind turbine reaches the rated rotating speed.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that the first mode is applied to the condition that the power supply demand of a user is greater than the heat supply/cold demand.
The control method of the wind-heat machine set energy system provided by the invention is also characterized in that the S4 comprises the following steps:
s4.1: the wind turbine drives the generator to work, and the generator generates electricity after the rotating speed of the generator is not less than the first tangential wind speed;
s4.2: the pitch angle is unchanged, the rotating speed of the wind turbine is controlled by adjusting the load of the generator, the compressor is connected after the generator is fully loaded, and the wind turbine, the generator and the compressor are adjusted to reach the highest rotating speed; s4.3: adjusting the pitch angle through a variable pitch system of the wind turbine to ensure that an energy system of the wind-heat unit runs at constant power;
s4.4: when the wind speed is reduced to the extent that the generator and the compressor cannot be driven to work normally at the same time, the compressor is switched out to keep the wind turbine to operate according to the optimal tip speed ratio;
s4.5: and after the compressor is switched out, the wind turbine still cannot operate according to the optimal tip speed ratio, the generator is switched out, and the propeller is withdrawn after the rotating speed is lower than the cut-in rotating speed for 10 s.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that S4.2 comprises the following steps:
s4.2.1: the load of the generator is adjusted so as to adjust the rotating speed of the generator and control the rotating speed of the wind turbine, so that the wind turbine can run at the optimal tip speed ratio;
s4.2.2: after the load of the generator exceeds the rated torque and lasts for 10s, the compressor is connected;
s4.2.3: adjusting the generator to a rated load, and adjusting the load of a compressor to enable the wind turbine to be at an optimal rotating speed;
s4.2.4: when the capacity valve of the compressor is full, the wind turbine, the generator and the compressor all reach the highest rotating speed, and the wind turbine unit reaches the rated power.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that the second mode is applied to the condition that the heat supply/cold demand of a user is greater than the power supply demand.
The control method of the wind-heat machine set energy system provided by the invention is also characterized in that the S5 comprises the following steps:
s5.1: when the wind speed is lower than the second cut-in wind speed, the pitch angle is unchanged, and the compressor carrying position is at the lowest load position and is matched with the wind turbine to start;
s5.2: the wind turbine set adjusts the rotating speed according to the change of the wind speed, when the wind speed reaches a second cut-in wind speed, the wind turbine changes the pitch, the compressor is connected, the rotating speed of the wind turbine is controlled by adjusting a sliding valve of the compressor, and when a capacity valve of the compressor is full, the generator is connected, and the wind turbine, the generator and the compressor are adjusted to reach the highest rotating speed;
s5.3: the pitch angle is adjusted through a variable pitch system of the wind turbine, so that the wind energy capturing efficiency of the wind wheel is reduced, and the system is ensured to operate at constant power;
s5.4: when the wind speed is reduced to the extent that the compressor and the generator cannot be driven to work normally at the same time, the generator is switched out to keep the wind turbine to operate according to the optimal tip speed ratio;
s5.5: and after the generator is switched out, the wind turbine still cannot operate according to the optimal tip speed ratio, the compressor is switched out, and the propeller is withdrawn after the rotating speed is lower than the cut-in rotating speed for 10 s.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that in S5.2, the pitch angle of the variable pitch of the wind turbine is adjusted from 90 degrees to 40 degrees, and after the wind turbine is connected to the compressor, the pitch angle is adjusted from 40 degrees to 0 degrees after the rotating speed of the compressor reaches the lowest heating rotating speed.
The control method of the wind-heat unit energy system provided by the invention is also characterized in that the wind-heat unit energy system is provided with the maximum safe wind speed, and when the incoming wind speed is higher than the maximum safe wind speed, the whole wind-heat unit energy system is cut out and the oar is retracted.
Has the advantages that:
the control method of the wind-heat unit energy system overcomes the defects of a single device of the existing wind-heat unit, adopts the wind turbine with one driving two to drive the compressor and the generator, can effectively reduce the energy conversion loss in the middle conversion process, controls the power distribution of the compressor and the generator according to the real-time wind speed and the requirements of users, and controls the wind-heat unit to achieve the highest utilization efficiency.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a control block diagram of an energy system of a wind-heat unit provided by the present invention;
FIG. 2 is a relation curve of wind power, generator power and wind speed of the control method of the wind-heat set energy system provided by the invention;
fig. 3 is a relation curve of the wind turbine power, the compressor power and the wind speed of the control method of the wind-heat unit energy system provided by the invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the invention easy to understand, the following embodiments are specifically set forth in the following description with reference to the accompanying drawings.
In the description of the embodiments of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing and simplifying the description of the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1-3, a method for controlling an energy system of a wind turbine set is provided, the energy system of the wind turbine set comprises a wind turbine, a compressor and a generator, the wind turbine drives the compressor and the generator with one driving two, the energy system of the wind turbine set is provided with a first mode and a second mode, metal hoses are adopted at an inlet and an outlet of the compressor, the system is provided with a storage battery and a heat/cold storage water tank, and the method comprises the following steps:
s1: calculating rated rotating speeds of the compressor and the generator;
s2: setting an energy system of the wind-heat machine set according to the rated rotating speed calculated in the S1;
s3: judging the mode used in the current state, selecting the first mode for S4, and selecting the second mode for S5;
s4: disconnecting a clutch connected between the wind turbine and the compressor, wherein the wind turbine preferentially drives the generator to work;
s5: and (3) disconnecting the clutch connected between the wind turbine and the generator, wherein the wind turbine preferentially drives the compressor to work.
The control method of the wind-heat unit energy system provided by the embodiment adopts the wind turbine to drive the compressor and the generator by one driving two, can effectively reduce the energy conversion loss in the middle conversion process, controls the power distribution of the compressor and the generator according to the real-time wind speed and the requirements of users, and controls the wind-heat unit to achieve the highest utilization efficiency.
In some embodiments, the wind turbine has a rated power P of a kW, a rated rotating speed n and a cut-in wind speed vaRated wind speed vbBlade radius R, optimum tip speed ratio λ, maximum windEnergy utilization coefficient of CpCompressor and generator power rating P1,P2Both are a/2kW, the type of the compressor and the generator needs to be selected according to the rated power, and the rated rotating speed of the compressor is n1Rated speed of the generator is n2With this, the design of the speed increasing box can be determined, and the starting torque of the compressor is T3。
Determining rated torque T of compressor and generator1,T2。
And respectively calculating the corresponding wind speeds when the compressor and the generator reach rated torque in the regulation and control.
Assuming a wind speed v1In the process, the compressor reaches a rated torque in tracking the maximum wind energy utilization, namely the energy valve is fully adjusted.
Wind power machine
Speed of compressor
Compressor power
When P is present3＝PaAt this time, v can be obtained1. The same principle can be used to determine when the generator reaches T2At time, the wind speed is v 2.
The wind turbine is provided with a first cut-in wind speed and a second cut-in wind speed; the first cut-in wind speed is for a single-belt generator and the second cut-in wind speed is for a single-belt compressor. The wind turbine is connected with a speed increasing box, the speed increasing box is provided with two output shafts, the two output shafts are respectively connected with a generator and a compressor, and the speed increasing ratio of the two output shafts is configured to enable the generator and the compressor to reach the highest rotating speed simultaneously.
In some embodiments, the first mode is applied when the demand of the user for power is greater than the heating/cooling demand. For example, in spring and autumn, the user's demand for heat and cold is not high. The control method of the wind-heat unit energy system can be divided into the following stages:
and (5) starting. During this phase, the generator speed gradually increases from near zero to the cut-in speed, and once the generator speed is greater than or equal to the cut-in speed, the generator starts generating power.
And a maximum wind energy tracking stage. The main goal of this stage is to make the system always run in the state of maximum wind energy capture, and the maximum wind energy is tracked by the optimum tip speed ratio method. For this reason, it is required that the wind power machine should adjust the rotational speed according to the change of the wind speed to maintain the maximum wind energy utilization coefficient. The wind turbine control system adopts a fixed pitch control mode, because the mode is to generate power preferentially, the load of the generator is adjusted firstly so as to adjust the rotating speed of the generator, the rotating speed of the wind turbine is controlled, the wind turbine can operate at the optimal tip speed ratio, the load of the generator is increased due to the increase of the wind speed, and in order to avoid frequent access and cut-out of the compressor, the load of the generator is detected to exceed T2And lasting for 10s, and switching on the compressor.
The wind speed when the compressor is connected is v2When the wind power is
The power of the compressor is
The torque that the generator should be at the moment can be obtained
Due to instant closingThe engagement of the clutch to the compressor results in a sudden increase in the torque of the gearbox, which should be reduced to T before the compressor is engaged4The torque keeps unchanged before and after the compressor is connected, mechanical impact is reduced, and the wind turbine generator set can be controlled better. After the compressor is connected, the generator is continuously adjusted until the rated load is reached, and then the load of the compressor is selectively adjusted to enable the wind turbine to be at the optimal rotating speed so as to achieve the maximum wind energy utilization, because if the load is added to the generator, the generator is easily burnt out due to the further increase of the rotating speed of the fan. And finally, when the compressor energy valve is full, the wind turbine, the generator and the compressor reach the highest rotating speed at the moment, and the wind turbine unit reaches the rated power.
A constant power stage. During this phase, the compressor and the generator of the wind power plant have reached the maximum rotational speed and the output power of the plant has reached the rated power. In order to ensure the safe operation of the unit, the maximum wind energy capture is no longer taken as a control target, so the pitch angle can be adjusted by a pitch-variable system of the wind turbine, the wind energy capture efficiency of the wind turbine is reduced, and the constant-power operation of the system is ensured.
And a wind speed reduction stage. When the wind speed is reduced to the extent that the generator and the compressor cannot be driven to work normally at the same time, the compressor needs to be switched out to keep the wind turbine to operate according to the optimal tip speed ratio. If the wind turbine still can not operate according to the optimal tip speed ratio after the compressor is switched off, the motor is switched off. And if the rotating speed is lower than the cut-in rotating speed for 10s, retracting the propeller.
And a cutting-out stage, wherein when the incoming flow wind speed is higher than the maximum safe wind speed, the whole system is cut out, and the propeller is retracted.
In some embodiments, the second mode is applied when the user heating/cooling demand is greater than the power demand. Generally applied to two seasons of summer and winter, the demand of users on heat and cold is higher. The control method of the wind-heat unit energy system can be divided into the following stages:
in the starting stage, because the compressor does not run in a no-load mode, when the wind speed is lower than b, the wind turbine control system adopts a fixed pitch control mode. Although the compressor is not unloaded, the load position is at the lowest load position and is matched with the starting of the wind turbine.
And a maximum wind energy tracking stage, wherein the main aim of the stage is to enable the system to always run in a maximum wind energy capture state, and the maximum wind energy is tracked by an optimal tip speed ratio method. For this reason, the wind turbine is required to adjust the rotational speed according to the change of the wind speed so as to maintain the maximum wind energy utilization coefficient. And after the wind speed reaches b, the wind turbine starts to change the pitch, the process of adjusting the pitch angle from 90 degrees to 40 degrees serves as a starting stage, the compressor is connected, and when the rotating speed reaches the lowest working rotating speed of the compressor, the pitch angle is adjusted to 0 degree. The torque is controlled by controlling the slide valve of the compressor so that the wind turbine is at the optimal rotating speed. When the compressor energy valve is full, the generator is connected, and the generator can be slowly started in a no-load mode, so that the load of the compressor does not need to be reduced like a priority power generation mode to enable the torque before and after connection to be equal. After the generator is connected, the rotating speed of the wind turbine is controlled by controlling the load of the generator, so that the wind turbine can run at the optimal tip speed ratio, and finally the torque of the generator reaches T2At the moment, the wind turbine, the generator and the compressor all reach the highest rotating speed, and the wind turbine unit reaches the rated power.
A constant power stage. During this phase, the compressor and the generator of the wind power plant have reached the maximum rotational speed and the output power of the plant has reached the rated power. In order to ensure the safe operation of the unit, the maximum wind energy capture is no longer taken as a control target, so the pitch angle can be adjusted by a pitch-variable system of the wind turbine, the wind energy capture efficiency of the wind turbine is reduced, and the constant-power operation of the system is ensured.
And a wind speed reduction stage. When the wind speed is reduced to the extent that the generator and the compressor cannot be driven to work normally at the same time, the generator needs to be switched out to keep the wind turbine to operate according to the optimal tip speed ratio. And if the wind turbine still cannot operate according to the optimal tip speed ratio after the generator is switched out, the compressor is switched out again. And if the rotating speed is lower than the cut-in rotating speed for 10s, retracting the propeller.
And a cutting-out stage, wherein when the incoming flow wind speed is higher than the maximum safe wind speed, the whole system is cut out, and the propeller is retracted.
In summary, basic control strategies of different modes of the wind-driven cogeneration unit can be established: before the compressor and the generator reach rated power, the pitch angle of the wind turbine is kept constant, the rotating speed of the generator or the rotating speed of the compressor is adjusted according to requirements, and maximum wind energy tracking control is firstly carried out to expect to capture maximum wind energy. When the wind speed fluctuates, whichever mode is preferred to track the maximum wind energy by adjusting the generator load, since adjusting the compressor is slower in response. When the compressor and the generator reach rated power, the capture of wind energy is inhibited by increasing the pitch angle of the wind turbine, so that the output power of the system is stabilized near the rated power.
In some embodiments, a 1MW wind turbine is adopted, the rated wind speed is 12m/s, the cut-in wind speed is 3m/s, and the wind energy utilization coefficient CPThe optimum tip speed ratio λ is 8 at 0.4, and the rated power of the compressor and the generator is 0.5 MW. The rated rotating speed of the generator is 1500rpm, the rated rotating speed of the compressor is 3000rpm, the starting torque of the compressor is 48N/m, and the rated rotating speed of the wind turbine is 30 rpm. Taking a preferential power supply mode as an example, a clutch connected with a speed increasing box and a compressor is disconnected firstly, when the wind speed reaches 3m/s, a wind turbine drives a generator to work, the rotating speed of the wind turbine is increased along with the increase of the wind speed, the wind speed and the rotating speed of the wind turbine are measured at the moment, whether the wind turbine is the optimal rotating speed or not is observed, and if not, the rotating speed is controlled by controlling the load of the generator, so that the wind turbine is in the optimal rotating speed to achieve the maximum wind energy utilization. When the wind speed reaches v2The method comprises the steps that when the speed of a wind turbine is 7.75m/s, the rotating speed of the wind turbine is 19.55rpm, a generator reaches a rated torque 3183N/m, the compressor is connected, the torque of the generator is reduced to 3119.5N/m in order to keep the torque before and after connection unchanged as the compressor needs to be started, and after the compressor and the generator work normally, the generator is adjusted to the rated torque, then a compressor slide valve is adjusted, and the unit always tracks the maximum wind energy to be utilized. When the generator and the compressor reach rated torque, the wind turbine set reaches rated power, and when the wind speed continues to increase, the pitch angle can be adjusted through the pitch-variable system of the wind turbine, so that the wind energy capturing efficiency of the wind turbine is reduced, and the system is ensured to run at constant power.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A control method of a wind-heat unit energy system is characterized in that the wind-heat unit energy system comprises a wind turbine, a compressor and a generator, the wind turbine drives the compressor and the generator by one driving two, the wind turbine energy system is provided with a first mode and a second mode, and the method comprises the following steps:
s1: calculating rated rotating speeds of the compressor and the generator;
s2: setting an energy system of the wind-heat machine set according to the rated rotating speed calculated in the S1;
s3: judging the mode used in the current state, selecting the first mode for S4, and selecting the second mode for S5;
s4: disconnecting a clutch connected between the wind turbine and the compressor, wherein the wind turbine preferentially drives the generator to work;
s5: and (3) disconnecting the clutch connected between the wind turbine and the generator, wherein the wind turbine preferentially drives the compressor to work.
2. The method of controlling a wind turbine energy system according to claim 1, wherein the wind turbine has a first cut-in wind speed and a second cut-in wind speed; the first cut-in wind speed is for a single-belt generator and the second cut-in wind speed is for a single-belt compressor.
3. A control method for a wind turbine energy system according to claim 2, characterized in that the wind turbine is connected with a speed increasing box, the speed increasing box is provided with two output shafts, the two output shafts are respectively connected with a generator and a compressor, and the speed increasing ratio of the two output shafts is configured to enable the generator and the compressor to reach the highest rotating speed simultaneously when the wind turbine reaches the rated rotating speed.
4. A control method for a wind-heat unit energy system according to claim 3, wherein the first mode is applied when the demand for electricity from the user is greater than the demand for heat/cold.
5. A control method of a wind-heat set energy system according to claim 4, wherein the S4 includes the following steps:
s4.1: the wind turbine drives the generator to work, and the generator generates electricity after the rotating speed of the generator is not less than the first tangential wind speed;
s4.2: the pitch angle is unchanged, the rotating speed of the wind turbine is controlled by adjusting the load of the generator, the compressor is connected after the generator is fully loaded, and the wind turbine, the generator and the compressor are adjusted to reach the highest rotating speed;
s4.3: adjusting the pitch angle through a variable pitch system of the wind turbine to ensure that an energy system of the wind-heat unit runs at constant power;
s4.4: when the wind speed is reduced to the extent that the generator and the compressor cannot be driven to work normally at the same time, the compressor is switched out to keep the wind turbine to operate according to the optimal tip speed ratio;
s4.5: and after the compressor is switched out, the wind turbine still cannot operate according to the optimal tip speed ratio, the generator is switched out, and the propeller is withdrawn after the rotating speed is lower than the cut-in rotating speed for 10 s.
6. A control method for a wind-heat set energy system according to claim 5, characterized in that the S4.2 comprises the following steps:
s4.2.1: the load of the generator is adjusted so as to adjust the rotating speed of the generator and control the rotating speed of the wind turbine, so that the wind turbine can run at the optimal tip speed ratio;
s4.2.2: after the load of the generator exceeds the rated torque and lasts for 10s, the compressor is connected;
s4.2.3: adjusting the generator to a rated load, and adjusting the load of a compressor to enable the wind turbine to be at an optimal rotating speed;
s4.2.4: when the capacity valve of the compressor is full, the wind turbine, the generator and the compressor all reach the highest rotating speed, and the wind turbine unit reaches the rated power.
7. A control method for a wind-heat unit energy system according to claim 3, wherein the second mode is applied when the user heating/cooling demand is greater than the power demand.
8. A control method of a wind-heat set energy system according to claim 7, wherein the S5 includes the steps of:
s5.1: when the wind speed is lower than the second cut-in wind speed, the pitch angle is unchanged, and the compressor carrying position is at the lowest load position and is matched with the wind turbine to start;
s5.2: the wind turbine set adjusts the rotating speed according to the change of the wind speed, when the wind speed reaches a second cut-in wind speed, the wind turbine changes the pitch, the compressor is connected, the rotating speed of the wind turbine is controlled by adjusting a sliding valve of the compressor, and when a capacity valve of the compressor is full, the generator is connected, and the wind turbine, the generator and the compressor are adjusted to reach the highest rotating speed;
s5.3: the pitch angle is adjusted through a variable pitch system of the wind turbine, so that the wind energy capturing efficiency of the wind wheel is reduced, and the system is ensured to operate at constant power;
s5.4: when the wind speed is reduced to the extent that the compressor and the generator cannot be driven to work normally at the same time, the generator is switched out to keep the wind turbine to operate according to the optimal tip speed ratio;
s5.5: and after the generator is switched out, the wind turbine still cannot operate according to the optimal tip speed ratio, the compressor is switched out, and the propeller is withdrawn after the rotating speed is lower than the cut-in rotating speed for 10 s.
9. The method for controlling the energy system of the wind-heat machine set according to claim 8, wherein in S5.2, the pitch angle of the variable pitch of the wind turbine is adjusted from 90 degrees to 40 degrees, and after the compressor is connected, the pitch angle is adjusted from 40 degrees to 0 degrees after the rotating speed of the compressor reaches the lowest heating rotating speed.
10. The method for controlling the wind-heat unit energy system according to claim 1, wherein the wind-heat unit energy system has a maximum safe wind speed, and when the wind speed of the incoming flow is higher than the maximum safe wind speed, the whole wind-heat unit energy system is switched off and the propeller is retracted.
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