CN115030857B - Power generation stable control method and system for hydraulic wave power generation device - Google Patents
Power generation stable control method and system for hydraulic wave power generation device Download PDFInfo
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- CN115030857B CN115030857B CN202210736602.8A CN202210736602A CN115030857B CN 115030857 B CN115030857 B CN 115030857B CN 202210736602 A CN202210736602 A CN 202210736602A CN 115030857 B CN115030857 B CN 115030857B
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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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
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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
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
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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
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention relates to the technical field of wave energy power generation, and discloses a stable control method and a stable control system for power generation of a hydraulic wave energy power generation device. Based on the problems of unstable power generation and high lithium battery charging and discharging frequency of the current hydraulic wave power generation device, the invention obtains the generating capacity function of the energy accumulator in an actual measurement mode, calculates the average power generation power of the device when the control valve bank implements an autonomous working mode in real time, calculates a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the calculated average power generation power, and switches the control valve bank to the electric control working mode to control the corresponding hydraulic motor based on the obtained calculation result, thereby realizing stable control of power generation of all generators in the device; the invention can fully exert the energy storage function of the energy accumulator, maintain the uninterrupted wave energy generation power, ensure that the wave energy generation power is more stable, simultaneously reduce the charge and discharge frequency of the lithium battery and prolong the service life of the lithium battery in the device.
Description
Technical Field
The invention relates to the technical field of wave energy power generation, in particular to a method and a system for stably controlling power generation of a hydraulic wave energy power generation device.
Background
Wave energy power generation is a main form of wave energy development and utilization, and is characterized in that wave energy is converted into mechanical energy or hydraulic energy through a wave energy power generation device and then is converted into electric energy.
At present, a hydraulic wave energy power generation device is widely applied. The device comprises a hydraulic cylinder, an energy accumulator, an overflow valve, an oil tank and a debugging oil pump, wherein the energy accumulator is connected with the overflow valve through a high-pressure oil pipe, the overflow valve is connected with the oil tank through an oil return pipe, the debugging oil pump is positioned between the hydraulic cylinder and the oil tank, the high-pressure oil pipe is connected with two control modules, each control module comprises a control valve group, a hydraulic motor, a generator and an AC/DC rectifier which are sequentially connected, and the two AC/DC rectifiers are connected with a lithium battery through a direct current bus. The control valve group in the device has two working modes, namely, a hydraulic motor is started and closed according to a preset value of a pressure switch in the control valve group, and the control valve group is called an autonomous working mode; secondly, the hydraulic motor is controlled by an electromagnetic valve in the control valve group, which is called an electric control working mode.
At present, the hydraulic wave energy power generation device uses an autonomous working mode when working, and an electric control working mode is only used during maintenance and debugging. In the autonomous working mode, the hydraulic cylinder compresses turbine oil to enter the energy accumulator when waves come, and the control valve group performs start-stop control on the corresponding hydraulic motor according to the comparison result of the pressure of the high-pressure oil pipe and the corresponding pressure threshold value, so that the control of power generation of the engine is realized. However, this control method cannot fully exert the energy storage function of the energy storage device, and the hydraulic energy loss during the control method causes that the hydraulic motor cannot be started for a period of time in the power generation period, and at this time, the device has no power generation, and lithium batteries are required to provide power generation. It can be seen that this hydraulic wave energy power generation device has two problems: firstly, intermittent and unstable wave energy power generation power; secondly, the lithium battery is subjected to frequent charge and discharge impact, and the service life of the lithium battery is influenced.
Disclosure of Invention
The invention provides a stable control method and a stable control system for the power generated by a hydraulic wave power generation device, and solves the technical problems that the existing hydraulic wave power generation device is unstable in power generation and high in charging and discharging frequency of a lithium battery.
The invention provides a stable control method for the generation power of a hydraulic wave energy power generation device, which comprises a hydraulic cylinder, an energy accumulator, an overflow valve, an oil tank and a debugging oil pump, wherein the energy accumulator is connected with the overflow valve through a high-pressure oil pipe, the overflow valve is connected with the oil tank through an oil return pipe, the debugging oil pump is positioned between the hydraulic cylinder and the oil tank, the high-pressure oil pipe is connected with two control modules, each control module comprises a control valve group, a hydraulic motor, a generator and an AC/DC rectifier which are sequentially connected, the two AC/DC rectifiers are connected with a lithium battery through a direct current bus, a pressure switch and an electromagnetic valve which are used for controlling the corresponding hydraulic motor are arranged in each control valve group, the corresponding hydraulic motor is controlled by the pressure switch under an autonomous working mode, and the corresponding hydraulic motor is controlled by the electromagnetic valve under an electric control working mode, and the method comprises the following steps:
Acquiring parameter thresholds of the hydraulic wave energy power generation device, wherein the parameter thresholds comprise a working pressure threshold range, and starting pressure, a starting pressure coefficient and a starting pressure correction quantity threshold range of each generator;
the method comprises the steps of actually measuring and obtaining electric quantity which can be generated when an energy accumulator is released to the minimum working pressure from any initial pressure, determining a generating capacity function of the energy accumulator according to the obtained actually measured data, and calculating the maximum time of the energy accumulator for maintaining the station service electricity according to the generating capacity function;
determining a monitoring period according to the maximum time, enabling a pressure switch in each control valve group to control a corresponding hydraulic motor according to preset control parameters after the hydraulic wave power generation device is put into operation, and calculating average power generation of the device in the monitoring period in real time;
and calculating a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the average power generation and the parameter threshold, taking the obtained calculation result as the latest control parameter threshold of the electromagnetic valve in each control valve group, and enabling the electromagnetic valve in each control valve group to control the corresponding hydraulic motor according to the latest control parameter threshold.
According to one implementation manner of the first aspect of the present invention, the actually measuring obtains an amount of electricity that can be generated when the accumulator is released to a minimum working pressure under any initial pressure, and determines a generating capacity function of the accumulator according to the obtained actually measured data, where the determining includes:
controlling and debugging an oil pump to perform pressurization operation, and testing the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under any initial pressure to obtain measured data;
the following generating capacity function is established according to the measured data:
wherein W (P) represents the electric quantity which can be generated when the accumulator is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
According to one implementation manner of the first aspect of the present invention, the calculating, according to the power generation capacity function, a maximum time for which the energy accumulator can maintain the service electricity includes:
calculating the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under the maximum working pressure according to the generating capacity function;
according to the obtained electric quantity calculation result, calculating the maximum time for the energy accumulator to maintain the station service electricity according to the following formula:
T x ＝W(P max )/Q min
Wherein T is x Represents the maximum time for the accumulator to maintain the station service electricity, Q min Is the minimum value of the generated power of each generator.
According to one implementation manner of the first aspect of the present invention, the calculating, according to the average generated power and the parameter threshold, a dynamic pressure constant value and a running time parameter used in an electronically controlled operation mode includes:
the dynamic pressure constant and the running time parameter used in the electric control working mode are calculated according to the following formula:
wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' minimum working pressure used in an electric control working mode, wherein a generator with smaller power generation in the device is used as a first generator, a generator with larger power generation in the device is used as a second generator, and P 1 ' represents the starting pressure of the first generator, P 2 ' represents the starting pressure of the second generator, t 2 ' represents the operating time of the second generator, L P1 A lower limit value L for the starting pressure correction amount of the first generator P2 A lower limit value H for the correction amount of the starting pressure of the second generator P1 An upper limit value H for the starting pressure correction amount of the first generator P2 For the upper limit value, K, of the starting pressure correction amount of the second generator 1 For the starting pressure coefficient, K, of the first generator 2 For the start-up pressure coefficient, Q of the second generator 1 For the power generated by the first generator, Q 2 For the power generated by the second generator, Q ave To average power of electricity, T x And representing the maximum time for which the energy accumulator can maintain the station service electricity, wherein m is the lower limit value of the running duration of the second generator.
The invention provides a stable control system for the generated power of a hydraulic wave energy generating device, the hydraulic wave energy generating device comprises a hydraulic cylinder, an energy accumulator, an overflow valve, an oil tank and a regulating oil pump, the energy accumulator is connected with the overflow valve through a high-pressure oil pipe, the overflow valve is connected with the oil tank through an oil return pipe, the regulating oil pump is positioned between the hydraulic cylinder and the oil tank, the high-pressure oil pipe is connected with two control modules, each control module comprises a control valve group, a hydraulic motor, a generator and an AC/DC rectifier which are sequentially connected, the two AC/DC rectifiers are connected with a lithium battery through a direct current bus, a pressure switch and an electromagnetic valve which are used for controlling the corresponding hydraulic motor are arranged in each control valve group, the corresponding hydraulic motor is controlled by the pressure switch in an autonomous working mode, and the corresponding hydraulic motor is controlled by the electromagnetic valve in an electric control working mode, and the system comprises:
The system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring parameter thresholds of the hydraulic wave energy power generation device, and the parameter thresholds comprise a working pressure threshold range, starting pressure of each generator, a starting pressure coefficient and a starting pressure correction quantity threshold range;
the energy storage parameter determining module is used for actually measuring and obtaining the electric quantity which can be generated when the energy storage device is released to the minimum working pressure from any initial pressure, determining the generating capacity function of the energy storage device according to the obtained actually measured data, and calculating the maximum time of the energy storage device for maintaining the station service electricity according to the generating capacity function;
the average power generation calculation module is used for determining a monitoring period according to the maximum time, and after the hydraulic wave power generation device is put into operation, a pressure switch in each control valve group controls a corresponding hydraulic motor according to preset control parameters to calculate the average power generation power of the device in the monitoring period in real time;
and the power stability control module is used for calculating a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the average power generation and the parameter threshold value, taking the obtained calculation result as the latest control parameter threshold value of the electromagnetic valve in each control valve group, and enabling the electromagnetic valve in each control valve group to control the corresponding hydraulic motor according to the latest control parameter threshold value.
According to one implementation manner of the second aspect of the present invention, the energy storage parameter determining module includes:
the testing unit is used for controlling the debugging oil pump to perform pressurization operation, testing the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under any initial pressure, and obtaining measured data;
the generating capacity function determining unit is used for establishing the following generating capacity functions according to the actual measurement data:
wherein W (P) represents the electric quantity which can be generated when the accumulator is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
According to one implementation manner of the second aspect of the present invention, the energy storage parameter determining module further includes:
the first calculation unit is used for calculating the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under the maximum working pressure according to the generating capacity function;
the second calculation unit is used for calculating the maximum time for the energy accumulator to maintain the station service according to the following formula according to the obtained electric quantity calculation result:
T x ＝W(P max )/Q min
wherein T is x Represents the maximum time for the accumulator to maintain the station service electricity, Q min Is the minimum value of the generated power of each generator.
According to one manner of implementation of the second aspect of the present invention, the power smoothing control module includes:
the third calculation unit is used for calculating a dynamic pressure fixed value and a running time parameter used in the electric control working mode according to the following formula:
wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' minimum operating pressure for use in electronically controlled mode of operation to accommodateCentering a generator with smaller power as a first generator, and centering a generator with larger power as a second generator, P 1 ' represents the starting pressure of the first generator, P 2 ' represents the starting pressure of the second generator, t 2 ' represents the operating time of the second generator, L P1 A lower limit value L for the starting pressure correction amount of the first generator P2 A lower limit value H for the correction amount of the starting pressure of the second generator P1 An upper limit value H for the starting pressure correction amount of the first generator P2 For the upper limit value, K, of the starting pressure correction amount of the second generator 1 For the starting pressure coefficient, K, of the first generator 2 For the start-up pressure coefficient, Q of the second generator 1 For the power generated by the first generator, Q 2 For the power generated by the second generator, Q ave To average power of electricity, T x And representing the maximum time for which the energy accumulator can maintain the station service electricity, wherein m is the lower limit value of the running duration of the second generator.
A third aspect of the present invention provides a hydraulic wave power generation device power stability control system, including:
a memory for storing instructions; the instruction is used for realizing the stable control method of the power generation power of the hydraulic wave energy power generation device in any mode;
and the processor is used for executing the instructions in the memory.
A fourth aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, implements the hydraulic wave power generation device power stability control method according to any one of the above-described modes.
From the above technical scheme, the invention has the following advantages:
based on the problems of unstable power generation and high lithium battery charging and discharging frequency of the current hydraulic wave power generation device, the invention obtains the generating capacity function of the energy accumulator in an actual measurement mode, calculates the average power generation power of the device when the control valve bank implements an autonomous working mode in real time, calculates a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the calculated average power generation power, and switches the control valve bank to the electric control working mode to control the corresponding hydraulic motor based on the obtained calculation result, thereby realizing stable control of power generation of all generators in the device; the invention can fully exert the energy storage function of the energy accumulator, maintain the uninterrupted wave energy generation power, ensure that the wave energy generation power is more stable, simultaneously reduce the charge and discharge frequency of the lithium battery and prolong the service life of the lithium battery in the device.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydraulic wave energy power plant on which the method and system of the present invention is based;
FIG. 2 is a graph illustrating a control scheme of the generated power of a hydraulic wave energy power generator when a control valve set according to an alternative embodiment of the present invention performs an autonomous mode of operation;
FIG. 3 is a flow chart of a method for controlling the power generation stability of a hydraulic wave energy power generation device according to an alternative embodiment of the present invention;
FIG. 4 is a schematic illustration of a small wave regime (Q) provided by an alternative embodiment of the present invention ave ＜Q 1 ) The power generation control curve graph of the hydraulic wave energy power generation device;
FIG. 5 is a diagram of medium-to-large wave conditions (Q) provided by an alternative embodiment of the present invention ave ≥Q 2 ) The power generation control curve graph of the hydraulic wave energy power generation device;
Fig. 6 is a schematic block diagram of a hydraulic wave energy power generation device power stability control system according to an alternative embodiment of the present invention.
Reference numerals:
1-an oil tank; 2-check valve; 3-a hydraulic cylinder; 4-an accumulator; 5-controlling a valve group; 6-a hydraulic motor; 7-a generator; 8-overflow valve; 9-high pressure oil pipe; 10-an oil return pipe; an 11-AC/DC rectifier; 12-direct current buses; a 13-lithium battery; 14-debugging an oil pump; g1-a first generator; g2—a second generator; m1-a first hydraulic motor; m2-a second hydraulic motor M2; f1-a first control valve group; f2-a second control valve group; 100-an acquisition module; 200-an energy storage parameter determining module; 300-an average generated power calculation module; 400-power smoothing control module.
Detailed Description
The embodiment of the invention provides a method and a system for stably controlling the power generation of a hydraulic wave power generation device, which are used for solving the technical problems of unstable power generation and high charging and discharging frequency of a lithium battery in the conventional hydraulic wave power generation device.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The hydraulic wave energy power generation device commonly used at present is shown in fig. 1. The device comprises an oil tank 1, a check valve 2, a hydraulic cylinder 3, an energy accumulator 4, a control valve group 5, a hydraulic motor 6, a generator 7, an overflow valve 8, a high-pressure oil pipe 9, an oil return pipe 10, an AC/DC rectifier 11, a direct current bus 12, a lithium battery 13 and a debugging oil pump 14.
The accumulator 4 is connected with the overflow valve 8 through the high-pressure oil pipe 9, the overflow valve 8 is connected with the oil tank 1 through the oil return pipe 10, and the debugging oil pump 14 is positioned between the hydraulic cylinder 3 and the oil tank 1.
The generator 7 includes a first generator G1 and a second generator G2, wherein the generated power of the first generator G1 is smaller than the generated power of the second generator G2. Typically, the generated power of the first generator G1 is 5kW and the generated power of the second generator G2 is 10kW.
The hydraulic motor 6 comprises a first hydraulic motor M1 and a second hydraulic motor M2, the control valve block 5 comprising a first control valve block F1 and a second control valve block F2, wherein the first control valve block F1, the first hydraulic motor M1, the first generator G1 and the AC/DC rectifier 11 connected to the first generator G1 are used as one control module, and the second control valve block F2, the second hydraulic motor M2, the second generator G2 and the AC/DC rectifier 11 connected to the second generator G2 are used as another control module.
At present, the hydraulic wave energy power generation device uses an autonomous working mode when working, and an electric control working mode is only used during maintenance and debugging.
The working principle under the autonomous working mode is as follows: when waves come, the wave-absorbing floating body moves up and down, the linkage hydraulic cylinder 3 compresses turbine oil to enter the accumulator 4, the air bag in the accumulator 4 is compressed, when the oil pressure of the high-pressure oil pipe 9 reaches the starting pressure of the first hydraulic motor M1 (namely P in figure 2 1 ) When in use, the first control valve group F1 is conducted, the first hydraulic motor M1 is started to drive the first generator G1 to generate electricity, and the generated electricity power is Q 1 The method comprises the steps of carrying out a first treatment on the surface of the When the oil pressure of the high-pressure oil pipe 9 reaches the start pressure of the second hydraulic motor M2 (i.e., P in fig. 2 2 ) When in use, the second control valve group F2 is conducted, the second hydraulic motor M2 is started to drive the second generator G2 to generate electricity, and the total power of the electricity generation is Q 1 +Q 2 The method comprises the steps of carrying out a first treatment on the surface of the When the oil pressure is less than P 2 -△P 1 (△P 1 A first return difference value), the hydraulic motor M2 is stopped; when the oil pressure is less than P min At this time, the first hydraulic motor M1 is stopped.
The relief valve 8 is protective when the oil pressure exceeds the maximum operating pressure P max When the overflow valve 8 is conducted, the pressure oil is released to the oil return pipe 10, which is lower than P max - Δp2 (Δp2 is the second difference value) and then automatically shut down.
From the generated power control graph of fig. 2, it can be seen that the apparatus has the following problems in power control:
The starting and stopping of the second hydraulic motor M2 are only based on the feedback action of the pressure switch, and are not judged according to the analysis of the external input energy under the current working condition, if T3-T2 is less than T x (namely, the maximum time that the energy accumulator can maintain the station service electricity) shows that the second hydraulic motor M2 consumes excessive hydraulic energy, so that the first hydraulic motor M1 cannot generate electricity in the period from t3 to t4 due to insufficient hydraulic energy, the fact that the energy accumulator is not fully utilized for energy storage is reflected, and the station service electricity of the device in the period from t3 to t4 needs to be supplied with power by means of external energy sources.
Aiming at the problems of the existing hydraulic wave energy power generation device, the invention provides a stable control method and a stable control system for the power generation power of a pressure type wave energy power generation device.
Referring to fig. 3, fig. 3 shows a flowchart of a method for controlling power generation stability of a hydraulic wave power generation device according to an embodiment of the present invention.
The method for stably controlling the power generation power of the pressure type wave energy power generation device provided by the embodiment of the invention comprises the steps S1-S4.
Step S1, acquiring parameter thresholds of the hydraulic wave energy power generation device, wherein the parameter thresholds comprise a working pressure threshold range, and a starting pressure, a starting pressure coefficient and a starting pressure correction quantity threshold range of each power generator 7.
And S2, actually measuring and obtaining the electric quantity which can be generated when the accumulator 4 is released to the minimum working pressure from any initial pressure, determining the generating capacity function of the accumulator 4 according to the obtained actually measured data, and calculating the maximum time for the accumulator 4 to maintain the station service electricity according to the generating capacity function.
In one possible implementation, the actually measuring obtains an amount of electricity that can be generated when the accumulator 4 is released to a minimum working pressure at any initial pressure, and determines a power generation function of the accumulator 4 according to the obtained actually measured data, including:
controlling and debugging the oil pump 14 to perform pressurization operation, and testing the electric quantity which can be generated when the energy accumulator 4 is released to the minimum working pressure under any initial pressure to obtain actual measurement data;
the following generating capacity function is established according to the measured data:
wherein W (P) represents the electric quantity which can be generated when the accumulator 4 is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
In one possible implementation, the calculating the maximum time that the energy storage 4 can maintain the service electricity according to the power generation capacity function includes:
Calculating the electric quantity which can be generated when the energy accumulator 4 is released to the minimum working pressure under the maximum working pressure according to the generating capacity function;
according to the obtained electric quantity calculation result, calculating the maximum time for which the energy accumulator 4 can maintain the station service electricity according to the following formula:
T x ＝W(P max )/Q min
wherein T is x Indicating the maximum time for which the accumulator 4 can sustain service electricity, Q min Is the minimum value of the generated power of each of the generators 7.
With respect to FIG. 1, in this embodiment, Q min I.e. the generated power of the first generator G1.
And step S3, determining a monitoring period according to the maximum time, enabling a pressure switch in each control valve group 5 to control a corresponding hydraulic motor 6 according to preset control parameters after the hydraulic wave power generation device is put into operation, and calculating the average power generation of the device in the monitoring period in real time.
After the wave energy power generation device is put into operation, the wave energy power generation device starts to operate in an autonomous working mode, and at the moment, a pressure switch in the control valve group 5 controls a corresponding hydraulic motor 6 according to preset control parameters. In this step S3, the average generated power may be calculated according to the following formula:
wherein (0, T) m ) To monitor the period of time, Q ave Represents the average generated power of the electric power generator,representing T m The amount of electricity that can be generated by the time accumulator 4, W (P 0 ) Indicating the amount of power that the accumulator 4 can deliver at time 0.
As a preferred embodiment, T is set m ＝3T x 。
According to the embodiment of the invention, the calculation of the average power generation is performed based on the actually measured power generation function, so that the calculation result is more fit with the actual situation, and the accuracy of the dynamic pressure fixed value and the running time parameter used in the electric control working mode in the subsequent calculation is ensured.
And S4, calculating a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the average power generation and the parameter threshold, taking the obtained calculation result as the latest control parameter threshold of the electromagnetic valve in each control valve group 5, and enabling the electromagnetic valve in each control valve group 5 to control the corresponding hydraulic motor 6 according to the latest control parameter threshold.
In one implementation manner, the calculating the dynamic pressure constant value and the running time parameter used in the electronic control working mode according to the average generated power and the parameter threshold value includes:
the dynamic pressure constant and the running time parameter used in the electric control working mode are calculated according to the following formula:
wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' is the minimum working pressure used in the electric control working mode, the generator 7 with smaller power generation in the device is used as the first generator G1, the generator 7 with larger power generation in the device is used as the second generator G2,P 1 ' represents the starting pressure, P, of the first generator G1 2 ' represents the starting pressure, t, of the second generator G2 2 ' represents the operating time length, L, of the second generator G2 P1 A lower limit value L of the correction amount of the starting pressure of the first generator G1 P2 A lower limit value H of the start pressure correction amount of the second generator G2 P1 An upper limit value H for the correction amount of the starting pressure of the first generator G1 P2 An upper limit value K for the correction amount of the starting pressure of the second generator G2 1 For the starting pressure coefficient, K, of the first generator G1 2 For the start-up pressure coefficient, Q, of the second generator G2 1 For the power generated by the first generator G1, Q 2 For the power generated by the second generator G2, Q ave To average power of electricity, T x And representing the maximum time for which the accumulator 4 can maintain the station service electricity, wherein m is the lower limit value of the operation duration of the second generator G2.
Wherein P is 1 The' calculation principle is as follows: when Q is ave When the energy is larger, the first generator G1 is started earlier, so that the second generator G2 is started when the input energy of the energy accumulator 4 is locally larger, and the continuous operation time of the first generator G1 is prolonged; when Q is ave And starting later in smaller time, so that frequent starting is avoided. L (L) P1 、H P1 The specific value of (2) is given according to the actual situation in the field.
P 2 The' calculation principle is as follows: when Q is ave When the energy input by the energy accumulator 4 is locally larger, the overflow valve action is caused, and when the energy input by the energy accumulator 4 is locally larger, the second generator G2 is started earlier ave And starting later in smaller time, so that frequent starting is avoided. L (L) P2 、H P2 The specific value of (2) is given according to the actual situation in the field.
t 2 The' calculation principle is as follows: representing T x The duration of the second generator G2 in the cycle that needs to be operated is set according to the actual situation in the field in order to prevent the operation time from being too short.
Autonomous mode of operation running several T' s x After the period, all calculated parameters have obtained the live values, the control valve group 5 is switched to an electric control working mode, and the power generation personThe conditions are as follows:
the first is a small wave condition (Q ave ＜Q 1 ) There is a period of 0 generated power when the oil pressure P is greater than or equal to P 1 The first generator G1 operates with a power curve as shown in curve (1) in fig. 4 and an oil pressure curve as shown in curve (2) in fig. 4. According to P 1 The 'calculation principle' shows that the starting time of the first generator G1 is based on Q ave Calculated in real time according to P 1 ' controlling the first generator G1 to start up can reduce the time without generating power, and also can avoid unnecessary starting up of the second generator G2.
The second is the medium and large wave condition (Q ave ≥Q 2 ) When the oil pressure P is more than or equal to P 1 When 'the oil pressure P is more than or equal to P', the first generator G1 is started 2 At' time, the second generator G2 is started. When the operation time of the second generator G2 reaches t 2 'after', and oil pressure P < P 2 At' time, the second generator G2 is stopped. The corresponding power curve is shown in fig. 5 as curve (1), and the oil pressure curve is shown in fig. 5 as curve (2). The working condition overcomes the discontinuous power generation phenomenon in the autonomous working mode, and the power generation is relatively stable.
The invention also provides a system for stably controlling the power generated by the hydraulic wave energy power generation device, which is used for realizing the method for stably controlling the power generated by the hydraulic wave energy power generation device.
Referring to fig. 6, fig. 6 shows a schematic block diagram of a power generation power stabilizing control system of a hydraulic wave power generation device according to an embodiment of the invention.
The embodiment of the invention provides a power generation power stable control system of a hydraulic wave energy power generation device, which comprises the following components:
the acquiring module 100 is configured to acquire parameter thresholds of the hydraulic wave energy power generation device, where the parameter thresholds include a working pressure threshold range, and a starting pressure, a starting pressure coefficient, and a starting pressure correction amount threshold range of each power generator 7;
The energy storage parameter determining module 200 is configured to actually measure and obtain an electric quantity which can be generated when the energy storage 4 is released from any initial pressure to a minimum working pressure, determine a generating capacity function of the energy storage 4 according to the obtained actually measured data, and calculate a maximum time for the energy storage 4 to maintain station service according to the generating capacity function;
the average power generation calculation module 300 is configured to determine a monitoring period according to the maximum time, and after the hydraulic wave power generation device is put into operation, make the pressure switch in each control valve group 5 control the corresponding hydraulic motor 6 according to preset control parameters, and calculate the average power generation of the device in the monitoring period in real time;
the power stability control module 400 is configured to calculate a dynamic pressure constant value and a running time parameter used in an electric control working mode according to the average generated power and the parameter threshold, and use the obtained calculation result as a latest control parameter threshold of the electromagnetic valve in each control valve group 5, so that the electromagnetic valve in each control valve group 5 controls the corresponding hydraulic motor 6 according to the latest control parameter threshold.
In one implementation, the energy storage parameter determination module 200 includes:
The testing unit is used for controlling the debugging oil pump 14 to perform pressurization operation, testing the electric quantity which can be generated when the energy accumulator 4 is released to the minimum working pressure under any initial pressure, and obtaining measured data;
the generating capacity function determining unit is used for establishing the following generating capacity functions according to the actual measurement data:
wherein W (P) represents the electric quantity which can be generated when the accumulator 4 is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
In one implementation, the energy storage parameter determination module 200 further includes:
a first calculation unit for calculating the amount of electricity that the accumulator 4 can generate when releasing to the minimum operating pressure at the maximum operating pressure according to the electric power generation function;
the second calculating unit is configured to calculate, according to the obtained electric quantity calculation result, a maximum time for which the energy accumulator 4 can maintain the station service according to the following formula:
T x ＝W(P max )/Q min
wherein T is x Indicating the maximum time for which the accumulator 4 can sustain service electricity, Q min Is the minimum value of the generated power of each of the generators 7.
In one implementation, the power smoothing control module 400 includes:
The third calculation unit is used for calculating a dynamic pressure fixed value and a running time parameter used in the electric control working mode according to the following formula:
wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' minimum working pressure used in the electric control working mode, the generator 7 with smaller power in the device is used as the first generator G1, and the generator 7 with larger power in the device is used as the second generators G2 and P 1 ' represents the starting pressure, P, of the first generator G1 2 ' represents the starting pressure, t, of the second generator G2 2 ' represents the operating time length, L, of the second generator G2 P1 A lower limit value L of the correction amount of the starting pressure of the first generator G1 P2 A lower limit value H of the start pressure correction amount of the second generator G2 P1 An upper limit value H for the correction amount of the starting pressure of the first generator G1 P2 An upper limit value K for the correction amount of the starting pressure of the second generator G2 1 For the starting pressure coefficient, K, of the first generator G1 2 For the start-up pressure coefficient, Q, of the second generator G2 1 For the power generated by the first generator G1, Q 2 Generating power for the second generator G2Power, Q ave To average power of electricity, T x And representing the maximum time for which the accumulator 4 can maintain the station service electricity, wherein m is the lower limit value of the operation duration of the second generator G2.
The invention also provides a system for stably controlling the power generated by the hydraulic wave energy power generation device, which comprises the following components:
a memory for storing instructions; the instruction is used for realizing the stable control method of the power generation power of the hydraulic wave energy power generation device according to any one of the embodiments;
and the processor is used for executing the instructions in the memory.
The invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the stable control method of the power generation power of the hydraulic wave power generation device according to any embodiment when being executed by a processor.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the above-described system and module may refer to the corresponding process in the foregoing method embodiment, and the specific beneficial effect of the above-described system and module may refer to the corresponding beneficial effect in the foregoing method embodiment, which is not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a stable control method of fluid pressure type wave energy power generation facility generating power, fluid pressure type wave energy power generation facility includes pneumatic cylinder, energy storage ware, relief valve, oil tank and debugging oil pump, and the energy storage ware passes through high-pressure oil pipe and connects the relief valve, and the relief valve passes through the oil return pipe and connects the oil tank, and the debugging oil pump is located between pneumatic cylinder and the oil tank, and two control module are connected to high-pressure oil pipe department, and every control module includes control valves, hydraulic motor, generator and the AC/DC rectifier that connect gradually, two the AC/DC rectifier passes through the direct current bus connection lithium cell, every be equipped with in the control valves and be used for controlling pressure switch and the solenoid valve that corresponds hydraulic motor, the control valves is by pressure switch control corresponding hydraulic motor under autonomous mode of operation, the control valves is by solenoid valve control corresponding hydraulic motor under automatically controlled mode of operation, its characterized in that, the method includes:
acquiring parameter thresholds of the hydraulic wave energy power generation device, wherein the parameter thresholds comprise a working pressure threshold range, and starting pressure, a starting pressure coefficient and a starting pressure correction quantity threshold range of each generator;
the method comprises the steps of actually measuring and obtaining electric quantity which can be generated when an energy accumulator is released to the minimum working pressure from any initial pressure, determining a generating capacity function of the energy accumulator according to the obtained actually measured data, and calculating the maximum time of the energy accumulator for maintaining the station service electricity according to the generating capacity function;
Determining a monitoring period according to the maximum time, enabling a pressure switch in each control valve group to control a corresponding hydraulic motor according to preset control parameters after the hydraulic wave power generation device is put into operation, and calculating average power generation of the device in the monitoring period in real time;
and calculating a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the average power generation and the parameter threshold, taking the obtained calculation result as the latest control parameter threshold of the electromagnetic valve in each control valve group, and enabling the electromagnetic valve in each control valve group to control the corresponding hydraulic motor according to the latest control parameter threshold.
2. The method for stabilizing the power generated by the hydraulic wave power generation device according to claim 1, wherein the actually measuring the amount of electricity that can be generated when the accumulator is released to the minimum working pressure at any initial pressure, determining the power generation function of the accumulator according to the obtained actually measured data, comprises:
controlling and debugging an oil pump to perform pressurization operation, and testing the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under any initial pressure to obtain measured data;
The following generating capacity function is established according to the measured data:
wherein W (P) represents the electric quantity which can be generated when the accumulator is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
3. The method for stabilizing the power generated by the hydraulic wave power generator according to claim 2, wherein calculating the maximum time for which the accumulator can maintain the service electricity according to the power generation capacity function includes:
calculating the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under the maximum working pressure according to the generating capacity function;
according to the obtained electric quantity calculation result, calculating the maximum time for the energy accumulator to maintain the station service electricity according to the following formula:
T x ＝W(P max )/Q min
wherein T is x Represents the maximum time for the accumulator to maintain the station service electricity, Q min Is the minimum value of the generated power of each generator.
4. The method for controlling the power generation stability of a hydraulic wave energy power generation device according to claim 1, wherein the calculating the dynamic pressure constant and the running time parameter used in the electric control operation mode according to the average power generation and the parameter threshold value comprises:
The dynamic pressure constant and the running time parameter used in the electric control working mode are calculated according to the following formula:
wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' minimum working pressure used in an electric control working mode, wherein a generator with smaller power generation in the device is used as a first generator, a generator with larger power generation in the device is used as a second generator, and P 1 ' represents the starting pressure of the first generator, P 2 ' represents the starting pressure of the second generator, t 2 ' represents the operating time of the second generator, L P1 A lower limit value L for the starting pressure correction amount of the first generator P2 A lower limit value H for the correction amount of the starting pressure of the second generator P1 An upper limit value H for the starting pressure correction amount of the first generator P2 For the upper limit value, K, of the starting pressure correction amount of the second generator 1 For the starting pressure coefficient, K, of the first generator 2 For the start-up pressure coefficient, Q of the second generator 1 For the power generated by the first generator, Q 2 For the power generated by the second generator, Q ave To average power of electricity, T x And representing the maximum time for which the energy accumulator can maintain the station service electricity, wherein m is the lower limit value of the running duration of the second generator.
5. The utility model provides a stationary control system of fluid pressure type wave energy power generation facility generating power, fluid pressure type wave energy power generation facility includes pneumatic cylinder, energy storage ware, relief valve, oil tank and debugging oil pump, and the energy storage ware passes through high-pressure oil pipe and connects the relief valve, and the relief valve passes through the oil return pipe and connects the oil tank, and the debugging oil pump is located between pneumatic cylinder and the oil tank, and two control module are connected to high-pressure oil pipe department, and every control module is including control valves, hydraulic motor, generator and the AC/DC rectifier that connect gradually, two the AC/DC rectifier passes through direct current bus connection lithium cell, every be equipped with in the control valves and be used for controlling pressure switch and the solenoid valve that corresponds hydraulic motor, the control valves corresponds hydraulic motor by pressure switch control under autonomous mode of operation, the control valves corresponds hydraulic motor by solenoid valve control under automatically controlled mode of operation, its characterized in that, the system includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring parameter thresholds of the hydraulic wave energy power generation device, and the parameter thresholds comprise a working pressure threshold range, starting pressure of each generator, a starting pressure coefficient and a starting pressure correction quantity threshold range;
the energy storage parameter determining module is used for actually measuring and obtaining the electric quantity which can be generated when the energy storage device is released to the minimum working pressure from any initial pressure, determining the generating capacity function of the energy storage device according to the obtained actually measured data, and calculating the maximum time of the energy storage device for maintaining the station service electricity according to the generating capacity function;
The average power generation calculation module is used for determining a monitoring period according to the maximum time, and after the hydraulic wave power generation device is put into operation, a pressure switch in each control valve group controls a corresponding hydraulic motor according to preset control parameters to calculate the average power generation power of the device in the monitoring period in real time;
and the power stability control module is used for calculating a dynamic pressure fixed value and a running time parameter used in an electric control working mode according to the average power generation and the parameter threshold value, taking the obtained calculation result as the latest control parameter threshold value of the electromagnetic valve in each control valve group, and enabling the electromagnetic valve in each control valve group to control the corresponding hydraulic motor according to the latest control parameter threshold value.
6. The hydraulic wave energy power generation device power stability control system of claim 5, wherein the energy storage parameter determination module comprises:
the testing unit is used for controlling the debugging oil pump to perform pressurization operation, testing the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under any initial pressure, and obtaining measured data;
the generating capacity function determining unit is used for establishing the following generating capacity functions according to the actual measurement data:
Wherein W (P) represents the electric quantity which can be generated when the accumulator is released to the minimum working pressure under any initial pressure P, Q (t) is the total power generated by the device at the t-th moment, and P min At minimum working pressure, P max Is the maximum operating pressure.
7. The hydraulic wave energy power generation device power stability control system of claim 6, wherein the energy storage parameter determination module further comprises:
the first calculation unit is used for calculating the electric quantity which can be generated when the energy accumulator is released to the minimum working pressure under the maximum working pressure according to the generating capacity function;
the second calculation unit is used for calculating the maximum time for the energy accumulator to maintain the station service according to the following formula according to the obtained electric quantity calculation result:
T x ＝W(P max )/Q min
wherein T is x Represents the maximum time for the accumulator to maintain the station service electricity, Q min Is the minimum value of the generated power of each generator.
8. The hydraulic wave energy power generation device power stability control system of claim 5, wherein the power stability control module comprises:
the third calculation unit is used for calculating a dynamic pressure fixed value and a running time parameter used in the electric control working mode according to the following formula:
Wherein P is max ' maximum operating pressure for use in electrically controlled mode of operation, P min ' minimum working pressure used in an electric control working mode, wherein a generator with smaller power generation in the device is used as a first generator, a generator with larger power generation in the device is used as a second generator, and P 1 ' represents the starting pressure of the first generator, P 2 ' represents the starting pressure of the second generator, t 2 ' represents the operating time of the second generator, L P1 A lower limit value L for the starting pressure correction amount of the first generator P2 A lower limit value H for the correction amount of the starting pressure of the second generator P1 An upper limit value H for the starting pressure correction amount of the first generator P2 For the upper limit value, K, of the starting pressure correction amount of the second generator 1 For the starting pressure coefficient, K, of the first generator 2 For the start-up pressure coefficient, Q of the second generator 1 For the power generated by the first generator, Q 2 For the power generated by the second generator, Q ave To average power of electricity, T x And representing the maximum time for which the energy accumulator can maintain the station service electricity, wherein m is the lower limit value of the running duration of the second generator.
9. The utility model provides a fluid pressure type wave energy power generation facility generating power steady control system which characterized in that includes:
A memory for storing instructions; wherein the instruction is used for realizing the stable control method of the generated power of the hydraulic wave energy power generation device according to any one of claims 1 to 4;
and the processor is used for executing the instructions in the memory.
10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method for controlling the power generation stability of the hydraulic wave power generation device according to any one of claims 1 to 4 is implemented.
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