CN109799707B - Biogas charging and discharging control method and system based on energy state of biogas tank and storage medium - Google Patents
Biogas charging and discharging control method and system based on energy state of biogas tank and storage medium Download PDFInfo
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Abstract
The invention provides a biogas charging and discharging control method, a biogas charging and discharging control system and a storage medium based on the energy state of a biogas tank, wherein the method comprises the following steps: step S10, establishing a wind energy-light energy-biomass energy-water energy hub frame to form a biogas energy storage system; step S20, establishing a biogas fluid network model for describing a biogas transmission process according to the dynamic fluid characteristics of biogas in the energy hub framework established in the step S10; step S30, estimating the energy state of a methane tank in the methane energy storage system by a preset method according to the methane fluid network model; and step S40, adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank. The invention regulates the methane charging and discharging process of the methane tank in the methane energy storage system by accurately estimating the energy state of the methane tank, ensures the safe operation of an energy hub based on the methane energy storage system and improves the accuracy of energy management.
Description
Technical Field
The invention relates to the technical field of energy control, in particular to a biogas charging and discharging control method and system based on the energy state of a biogas tank and a storage medium.
Background
In order to solve the problems of difficult power utilization, high grid connection cost, aggravation of environmental deterioration caused by long-term use of a diesel generator and the like in remote areas, a feasible scheme is formed by fully utilizing the conditions of local natural resources (such as methane, solar energy, wind energy and the like) to establish a multi-energy complementary micro-grid. In order to suppress the intermittency and randomness of the new energy output, a storage battery is generally selected as an energy storage system. However, as the energy storage capacity required by the energy storage system continuously increases, more storage batteries are required, and the investment cost correspondingly increases. And the storage battery has to be frequently charged and discharged to maintain the supply and demand balance of the microgrid, so that the service life of the microgrid is greatly shortened. Meanwhile, the post-treatment of the storage battery has great influence on the environment and the treatment cost is high. For the biogas as a clean energy, electric energy and heat energy can be directly or indirectly converted into the biogas through corresponding equipment, and the biogas can also be directly converted into electric energy or heat energy through corresponding equipment, so that the biogas is more and more concerned as a transitional energy storage substance to replace a storage battery energy storage system.
However, the existing research on the State of energy remaining (SOE) of the biogas tank is limited to a static process only, which obviously does not conform to the dynamic characteristics of the gas, resulting in inaccuracy in monitoring the State of energy remaining. Meanwhile, in an energy hub mainly based on a biogas energy storage system, the safety problems of pressure restriction of a biogas tank and pressure restriction of a biogas pipeline are solved, and the real-time pressure of the biogas tank and the biogas pipeline is required to be known when the biogas tank is inflated and deflated, so that the difficulty in safe operation and accurate energy management of the energy hub is brought by the fact that the energy state of the biogas tank in the biogas energy storage system cannot be accurately evaluated.
In view of the above, it is necessary to provide a method for accurately estimating the energy state of a methane tank and a methane gas charge/discharge control method based on the estimation of the energy state of the methane tank.
Disclosure of Invention
The invention mainly aims to provide a biogas charging and discharging control method, a biogas charging and discharging control system and a storage medium based on the energy state of a biogas tank, and aims to solve the problems of safe operation and accurate energy management of an energy hub based on a biogas energy storage system by accurately estimating the energy state of the biogas tank and forming a corresponding biogas charging and discharging control strategy.
In order to achieve the purpose, the invention provides a biogas charging and discharging control method based on the energy state of a biogas tank, which comprises the following steps:
step S10, establishing a wind energy-light energy-biomass energy-water energy hub frame to form a biogas energy storage system;
step S20, establishing a biogas fluid network model for describing a biogas transmission process according to the dynamic characteristics of biogas in the energy hub framework established in the step S10;
step S30, estimating the energy state of a methane tank in the methane energy storage system by adopting a preset method according to the methane fluid network model established in the step S20;
and step S40, adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank.
Preferably, the biogas fluid network model of step S20 is established according to a mass conservation equation by using the flow characteristics of biogas in the biogas energy storage system.
Preferably, the biogas fluid network model of step S20 is established according to the following method:
obtaining the pressure P at the node of the methane tank according to the mass conservation equation at the methane tanktankThe formula (2) is calculated.
Preferably, the step S30 is:
the energy state of the methane tank under the rated state is represented by the following formula:
SOEN＝QNVN(1)，s.t.PNVN＝nNRTN(2)；
wherein, SOENIs the energy state of the methane tank in a rated state, PNFor rated pressure, TNTo rated temperature, VNIs the volume of the biogas, QNIs the heat value of the marsh gas under rated pressure, nNThe amount of the substances of the biogas under a rated state, R is a universal gas constant;
the energy state of the methane tank in the actual operation process is represented by the following formula:
SOE＝QNVbio(3)，s.t.PbioVbio＝nRTN(4)；
q is equal to QNI.e. constant value of Q, volume V of biogasNConversion to PN，TNVolume V ofbio，PbioThe pressure of the methane tank after inflation and deflation is shown, and n is the amount of the substances of the methane;
from the above equations (2) and (4), it follows:
wherein P isbioCalculating according to the biogas fluid network model in the step S20;
and (5) calculating according to the formula (3) and the formula (5) to obtain the energy state of the methane tank at a certain moment.
Preferably, the step S40 further includes:
and step S42, adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub frame according to the estimated energy state of the methane tank and the output condition of the new energy.
Preferably, the method for adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub frame according to the estimated energy state of the methane tank and the new energy output condition comprises the following steps:
(1) when the power supply is insufficient, the methane tank transmits gas to the CCHP unit and then converts the gas into electric energy; when the heat supply is insufficient, the methane tank transmits gas to the gas boiler or the CCHP to convert the gas into heat energy; when the gas supply is insufficient, controlling the methane tank to transmit gas to the gas load;
(2) when the power supply is excessive, converting the electric energy into heat energy through the electric boiler to heat the methane tank so as to convert the heat energy into methane, and then conveying the converted methane to the methane tank for storage; when the heat supply is excessive, the methane tank is heated by heat energy to increase the methane yield, so that the heat energy is converted into methane, and then the converted methane is conveyed to the methane tank for storage; when the gas supply is excessive, the methane tank transmits gas to the methane tank;
in the adjusting process, the scheduling of the energy hub level and the adjustment of the methane tank are in different time scales, the scheduling time of the energy hub level is set to be 1 hour once, and the methane tank is adjusted every 10 minutes within the hour.
Preferably, in the process of adjusting the charging and discharging gas of the methane tank and adjusting the energy hub level, the following information is obtained by the methane tank energy state estimation method:
1) biogas tank SOEtank；
2) Pressure P in the biogas tanktank；
3) Average pressure P of methane delivery pipelinetube；
And judging whether the energy stored in the methane tank can meet the supply and demand requirements and whether the pressure of the methane tank and the methane conveying pipeline is in a safe range according to the information.
Preferably according to the SOE of the biogas tanktankPressure P in the methane tanktankAnd the average pressure P of the methane delivery pipelinetubeThe method for judging whether the pressure of the methane tank and the methane delivery pipeline is in a safe range comprises the following steps:
judging the SOE of the methane tanktankPressure P in the methane tanktankAnd the average pressure P of the methane delivery pipelinetubeWhether the following constraints are satisfied:
SOEmin＜SOEtank＜SOEmax
0＜Ptank＜Ptank-max
0＜Ptube＜Ptube-max
wherein, SOEmaxIs the maximum energy allowed to be stored in the methane tank, SOEminIs the lowest energy, P, which is required by the biogas tank to meet the current supply and demand relationship and should be storedtank-maxIs the maximum pressure, P, allowed by the methane tanktube-maxThe maximum average pressure allowed by the biogas pipeline;
average pressure P of biogas pipelinetubeCan be calculated from the following formula:
in the formula: ptube: the average pressure of the biogas pipelines;
P1: the initial end pressure of the biogas pipeline;
P2: the pressure at the tail end of the methane pipeline.
In addition, in order to achieve the above object, the present invention further provides a biogas charging and discharging control system based on the energy state of a biogas tank, the system includes a wind energy-light energy-biomass energy-water energy hub frame, the energy hub frame forms a biogas energy storage system, and the biogas charging and discharging control system based on the energy state of the biogas tank further includes:
the biogas fluid network model establishing module is used for establishing a biogas fluid network model for describing a biogas transmission process according to the wind energy-light energy-biomass energy-water energy hub framework;
the biogas energy state estimation module is used for estimating the energy state of a biogas tank in the biogas energy storage system by adopting a preset method according to the biogas fluid network model;
and the adjusting module is used for adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank.
Furthermore, in order to achieve the above object, the present invention also proposes a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above.
The invention relates to a biogas charging and discharging control method based on the energy state of a biogas tank, which comprises the following steps:
step S10, establishing a wind energy-light energy-biomass energy-water energy hub frame to form a biogas energy storage system;
step S20, establishing a biogas fluid network model for describing a biogas transmission process according to the dynamic characteristics of biogas in the energy hub framework established in the step S10;
step S30, estimating the energy state of a methane tank in the methane energy storage system by adopting a preset method according to the methane fluid network model established in the step S20;
and step S40, adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank.
The biogas charging and discharging control method based on the energy state of the biogas tank adjusts the corresponding biogas charging and discharging process by accurately estimating the energy state of the biogas tank, and solves the problems of safe operation and accurate energy management of an energy hub based on a biogas energy storage system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic flow chart of an embodiment of a biogas charging and discharging control method based on the energy state of a biogas tank according to the invention;
FIG. 2 is a schematic view of a wind-light-biomass-water energy hub frame proposed by the present invention;
FIG. 3 is a biogas fluid network model established by the present invention;
FIG. 4 is a graph showing the pressure of the methane tank according to the present invention as a function of time;
FIG. 5 is a graph showing the change of SOE of the methane tank obtained by the present invention with time.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical problems solved, the technical solutions adopted and the technical effects achieved by the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings and the specific embodiments. It is to be understood that the described embodiments are merely a few, and not all, of the embodiments of the present application. All other equivalent or obviously modified embodiments obtained by the person skilled in the art on the basis of the embodiments presented in the present application fall within the scope of protection of the invention without inventive step. The embodiments of the invention can be embodied in many different ways as defined and covered by the claims.
It should be noted that in the following description, numerous specific details are set forth in order to provide an understanding. It may be evident, however, that the subject invention may be practiced without these specific details.
It should be noted that, unless explicitly defined or conflicting, the embodiments and technical features in the present invention may be combined with each other to form a technical solution.
The invention provides a biogas charging and discharging control method based on the energy state of a biogas tank, aiming at solving the problems of safe operation and accurate energy management of an energy hub based on a biogas energy storage system by accurately estimating the energy state of the biogas tank and forming a corresponding biogas charging and discharging control strategy.
Referring to fig. 1, the biogas charging and discharging control method based on the energy state of the biogas tank comprises the following steps:
step S10, establishing a wind energy-light energy-biomass energy-water energy hub frame to form a biogas energy storage system;
the invention firstly constructs a wind energy-light energy-biomass energy-water energy hub frame, which is a hybrid energy system with 100 percent of renewable energy, and comprises wind energy, solar energy, water energy and biomass energy, wherein the biomass energy is methane. In this energy hub, renewable energy is converted into biogas, heat/cold energy and electrical energy by means of biogas tanks, CCHP, fans, water turbines. In addition, the energy sources are mutually converted by utilizing the complementary characteristics of the energy sources.
Generally, increasing the fermentation temperature increases the biogas production, while increasing the productivity. Therefore, in the process of energy conversion, heat energy can be converted into methane by heating the methane tank, and electric energy can be indirectly converted into methane. In fig. 2, the heat generated by the second electric boiler is used for heating the biogas digester, while the heat generated by the first electric boiler is mainly supplied to the heat load, but also provides a part for heating the biogas digester. In the energy hub shown in fig. 1, electrical energy can be converted into heat energy by means of an electrical boiler. The biogas and the electric energy can be changed into heat energy through a gas boiler and an electric boiler (comprising a first electric boiler and a second electric boiler), respectively. Biogas can also be converted into heat/cold energy and electrical energy by CCHP. And the heat energy and the electric energy can be converted into the methane by heating the methane tank. Besides the existence of the conversion device, an energy storage unit is arranged in the energy hub to process the redundant energy. The battery energy storage system is used for storing redundant electric energy, and the methane energy storage system is used for storing excessive methane. Because electrical and thermal energy can be converted into biogas, the biogas energy storage system provides an economically viable method of storing all the energy, thereby reducing the reliance of the energy hub on battery energy storage systems.
It should be noted that the proposed wind energy-light energy-biomass energy-water energy hub framework is not limited to the structure shown in fig. 2, and all architectures that can store and convert wind energy, light energy, biomass energy and water energy to each other are within the scope of the present invention.
Step S20, establishing a biogas fluid network model for describing a biogas transmission process according to the dynamic characteristics of biogas in the energy hub framework established in the step S10;
firstly, the flow of the biogas in the biogas energy storage system is a continuous process, and the parameters of each device are interrelated. The pressure and flow relationships of each device or system can be summarized as a fluid network model as shown in fig. 3. In FIG. 3, Pdig、Ptank、PLg、PFur、PCCHPRespectively showing the pressure of the nodes such as a methane tank, a methane load, a gas boiler, CCHP (combined cooling and Power, combined heat and Power generation system) and the like. The arrows in the figure indicate the direction of flow of biogas, Qdig、QLg、QFur、QCCHPRepresenting the flow of biogas transmitted in the pipeline. The wavy object between two nodes in the figure represents the admittance of the corresponding pipe. Finally according to node PtankThe conservation of mass equation of the point can be used to obtain the node pressure PtankThe calculation formula of (2). In the modeling process, assume:
(1)Ptankthe volume around the point is all centered at PtankThe other points are treated in the same way;
(2) except for PtankBesides, the pressure intensity of other nodes is a fixed value;
(2) adopting a lumped parameter method;
(3) the density of the whole methane tank is the same;
(4) the temperature of the gas in the biogas tank is constant;
(5) the methane tank has constant volume and variable pressure.
Next, P is determined from the biogas fluid network model created in step S20tankAccording to the conservation of mass equationComprises the following steps:
in the formula: m-pressure node PtankThe mass of the methane in the methane tank is the mass (kg) of the methane in the methane tank;
Qdiginflow pressure node PtankFlow rate (kg/s) of biogas;
QLg，QFur，QCCHPoutflow pressure node PtankFlow rate (kg/s) of biogas;
and m ═ ρ V:
because the methane tank has constant volume and variable pressure, the volume V of the methane in the current state is a constant value, and then:
during the process of filling and discharging the methane in the methane tank, the density of the compressible gas is changed, and rho is f (P, H); therefore, the method comprises the following steps:
in fluid mechanics, the rate of change of enthalpy H of a fluid is much lower than the rate of change of pressure, i.e. the rate of change of enthalpy H of a fluid
Ratio of
Much smaller, negligible, and then,
order to
Is the compressibility of the fluid, which represents the variation of the density of the fluid with the pressure, and once the type of the fluid is determined, K is regarded as a fixed value.
Wherein, CtubeThe admittance (flow coefficient) of the pipeline is a fixed value related to the structure of the pipeline.
Linearizing the pipeline admittance
converting the implicit Euler formula into a difference equation, the following equations are obtained:
the pressure P of the methane tank can be obtained by solving the differential equationtank。
Step S30, estimating the energy state of a methane tank in the methane energy storage system by adopting a preset method according to the methane fluid network model established in the step S20;
the step S30 is:
the energy state of the methane tank under the rated state is represented by the following formula:
SOEN＝QNVN(1)，s.t.PNVN＝nNRTN(2)；
wherein, SOENIs the energy state of the methane tank in a rated state, PNFor rated pressure, TNTo rated temperature, VNIs the volume of the biogas, QNIs the heat value of the marsh gas under rated pressure, nNThe amount of the substances of the biogas under a rated state, R is a universal gas constant;
the energy state of the methane tank in the actual operation process is represented by the following formula:
SOE＝QNVbio(3)，s.t.PbioVbio＝nRTN(4)；
q is equal to QNI.e. Q is constant, the volume V of the biogasNWhen converted into PN，TNVolume V ofbio，PbioThe pressure of the methane tank after inflation and deflation is shown, and n is the amount of the substances of the methane;
from the above equations (2) and (4), it follows:
wherein P isbioCalculated according to the biogas fluid network model in step S20, wherein P isbio＝Ptank；
And (5) calculating according to the formula (3) and the formula (5) to obtain the energy state of the methane tank at a certain moment.
And (3) simulating by using the model, and calculating the pressure and energy state of the methane tank every 10min to obtain a methane tank pressure variation curve with time as shown in figure 4 and a methane tank SOE variation curve with time as shown in figure 5.
Fig. 4 shows the pressure change of the biogas tank every 10min, the pressure of the biogas tank being obtained by solving equation (12) or equation (13).
From fig. 4 and the equations (3) and (5), the SOE of the methane tank at the corresponding time can be calculated, and the curve shown in fig. 5 can be obtained.
The simulation results were analyzed as follows:
1. the simulation curve of fig. 5 shows that the actual energy state of the biogas is not linearly related to the air inflow in the process of air inflow of the biogas tank. When the pressure in the tank is increased along with the increase of the air inflow, the equivalent volume of the stored marsh gas is changed under the conversion of the equivalent volume into the standard condition, and the research on the dynamic characteristics of the marsh gas is helpful for knowing the real-time energy state in the marsh gas tank.
2. In terms of time scale, the time interval of energy change in the methane tank is smaller than the time scale of micro-grid energy scheduling. The multi-scale energy management is helpful for judging whether the methane tank is in safe states of pressure, capacity and the like in real time.
3. Due to the difference of the working pressure of the devices for producing, storing and consuming the biogas, the devices such as a compressor and a turbine are needed in the transmission process of the biogas, the use of the devices also influences the energy decision of the microgrid, and the consumption of the microgrid on the electric energy is not ignored in the energy management process.
And step S40, adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank.
Further, the step S40 further includes:
and step S42, adjusting the biogas charging and discharging of a biogas tank in the biogas energy storage system under the energy hub framework according to the estimated energy state of the biogas tank and the load requirement.
The invention also provides a multi-time scale-based biogas charging and discharging control method by combining the biogas tank energy state estimation method, which can ensure the accurate management and safe operation of an energy hub. The multi-time scale energy management strategy means that the time scale of energy hub level scheduling is different from the time scale of methane tank gas charging and discharging control, and in the invention, the time scale of energy hub level scheduling is set to be 1 hour (corresponding adjustment can be made according to specific conditions). Due to the fluctuation of energy supply of the new energy, the biogas energy storage system needs to be adjusted on a smaller time scale in order to ensure that the supply and the demand are kept balanced within 1 hour, so the time scale of the biogas tank inflation and deflation control in the invention is 10 minutes (the corresponding adjustment can be made according to specific conditions). The adjustment of the methane tank is carried out once every 10 minutes, and when the methane tank is subjected to methane charging and discharging adjustment, the adjustment process is carried out according to the following two ways:
(1) the demand side has four load types, i.e., a cold load, a heat load, an electric load, and a gas load. When the output of the new energy unit does not meet the load requirement, control strategies need to be designed according to different load types. However, since the adjustment measure for the cooling load is consistent with the heating load, the adjustment measure for the cooling load is not analyzed below. When the heat supply is insufficient, the methane tank transmits gas to the gas boiler or the CCHP unit, and then the gas is converted into heat energy. When the power supply is insufficient, the methane tank transmits gas to the CCHP unit and then converts the gas into electric energy. When the gas supply is insufficient, namely the output of the methane tank is insufficient, the methane tank transmits gas to the gas load.
(2) When the output of the new energy unit is more than the load demand, the load type is not changed, and the adjustment measures for the cold load are not analyzed. When the power supply is excessive, the electric energy is converted into heat energy through the electric boiler to heat the methane tank, and then the heat energy is converted into methane and then the methane is conveyed to the methane tank to be stored. When the heat supply is excessive, the heat energy can directly increase the methane yield by heating the methane tank, thereby converting the heat energy into methane and then conveying the methane to the methane tank for storage. When the gas supply is excessive, the methane tank transmits gas to the methane tank.
The following information is obtained by the accurate estimation method of the SOE of the methane tank at the same time of the adjustment:
1) biogas tank SOEtank；
2) Pressure P in the biogas tanktank；
3) Average pressure P of methane delivery pipelinetube。
According to the information, whether the energy stored in the methane tank can meet the supply and demand requirements and whether the pressure of the methane tank and the methane conveying pipeline is in a safe range can be accurately judged. Wherein the energy state SOE of the methane tanktankPressure P of methane tanktankAnd the average pressure P of the pipelinetubeThe following constraints will be obeyed:
SOEmin＜SOEtank＜SOEmax(14)
0＜Ptank＜Ptank-max(15)
0＜Ptube＜Ptube-max(16)
wherein, sOEmaxIs the maximum energy allowed to be stored in the methane tank, SOEminIs the lowest energy, P, which is required by the biogas tank to meet the current supply and demand relationship and should be storedtank-maxIs the maximum pressure, P, allowed by the methane tanktube-maxMaximum average pressure allowed for the biogas pipeline. Mean pressure P of the pipetubeCan be calculated from equation (17):
in the formula: ptube: biogas pipeline average pressure (MPa)
P1: biogas pipeline initial pressure (MPa)
P2: biogas pipeline end pressure (MPa)
If the calculation result shows that all the parameters meet the constraint conditions, the energy hub can safely operate according to the established scheduling plan, and if the parameters do not meet the constraint conditions, the parameters need to be fed back to the energy hub layer to enable the energy hub layer to adjust the scheduling plan to enable the operation of the energy hub to be in a safe range again.
The biogas charging and discharging control method based on the energy state of the biogas tank adjusts the corresponding biogas charging and discharging process by accurately estimating the energy state of the biogas tank, and solves the problems of safe operation and accurate energy management of an energy hub based on a biogas energy storage system.
In addition, the invention also provides a biogas charging and discharging control system based on the energy state of the biogas tank, the biogas charging and discharging control system based on the energy state of the biogas tank comprises a wind energy-light energy-biomass energy-water energy hub frame, the energy hub frame comprises a biogas energy storage system used for storing biogas, and the biogas charging and discharging control system based on the energy state of the biogas tank further comprises:
the biogas fluid network model establishing module is used for establishing a biogas fluid network model for describing a biogas transmission process according to the wind energy-light energy-biomass energy-water energy hub framework;
the biogas energy state estimation module is used for estimating the energy state of a biogas tank in the biogas energy storage system by adopting a preset method according to the biogas fluid network model;
and the adjusting module is used for adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank.
The methane charging and discharging control system based on the energy state of the methane tank is used for realizing the steps of the method, and the details are not repeated.
Furthermore, the present invention also proposes a computer-readable storage medium, in which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method as described above.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A biogas charging and discharging control method based on the energy state of a biogas tank is characterized by comprising the following steps:
step S10, establishing a wind energy-light energy-biomass energy-water energy hub frame to form a biogas energy storage system;
step S20, according to the energy hub frame established in the step S10, a biogas fluid network model for describing a biogas transmission process is established by combining the dynamic fluid characteristics of biogas, wherein the biogas fluid network model is established according to a mass conservation equation by utilizing the dynamic fluid characteristics of biogas in a biogas energy storage system;
step S30, estimating the energy state of a methane tank in the methane energy storage system by adopting a preset method according to the methane fluid network model established in the step S20, wherein the energy state estimation method of the methane tank comprises the following steps:
the energy state of the methane tank under the rated state is represented by the following formula:
SOEN＝QNVN(1)，s.t.PNVN＝nNRTN(2)；
wherein, SOENIs the energy state of the methane tank in a rated state, PNFor rated pressure, TNTo rated temperature, VNIs the volume of the biogas, QNIs the heat value of the marsh gas under rated pressure, nNThe amount of the substances of the biogas under a rated state, R is a universal gas constant;
the energy state of the methane tank in the actual operation process is represented by the following formula:
SOE＝QNVbio(3)，s.t.PbioVbio＝nRTN(4)；
q is equal to QNI.e. Q is constant, the volume V of the biogasNWhen converted into PN，TNVolume V ofbio，PbioThe pressure of the methane tank after inflation and deflation is shown, and n is the amount of the substances of the methane;
from the above equations (2) and (4), it follows:
wherein P isbioCalculating according to the biogas fluid network model in the step S20;
calculating according to the formula (3) and the formula (5) to obtain the energy state of the methane tank at a certain moment;
step S40, adjusting the biogas charging and discharging of the biogas tank in the biogas energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the biogas tank, further comprising: and adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework according to the estimated energy state of the methane tank and the output condition of the new energy.
2. The biogas charge and discharge control method based on the energy state of the biogas tank as claimed in claim 1, wherein the biogas fluid network model of step S20 is established according to the following method:
obtaining the pressure P at the node of the methane tank according to the mass conservation equation at the methane tanktankThe formula (2) is calculated.
3. The biogas charging and discharging control method based on the energy state of the biogas tank as claimed in claim 1, wherein the method for adjusting the charging and discharging of the biogas tank in the biogas energy storage system under the energy hub framework according to the estimated energy state of the biogas tank and the output condition of the new energy source comprises the following steps:
(1) when the power supply is insufficient, the methane tank transmits gas to the CCHP unit and then converts the gas into electric energy; when the heat supply is insufficient, the methane tank transmits gas to the gas boiler or the CCHP unit to convert the gas into heat energy; when the gas supply is insufficient, controlling the methane tank to transmit gas to the gas load;
(2) when the power supply is excessive, converting the electric energy into heat energy through the electric boiler to heat the methane tank so as to convert the heat energy into methane, and then conveying the converted methane to the methane tank for storage; when the heat supply is excessive, the methane tank is heated by heat energy to increase the methane yield, so that the heat energy is converted into methane, and then the converted methane is conveyed to the methane tank for storage; when the gas supply is excessive, the methane tank transmits gas to the methane tank;
in the adjusting process, the scheduling of the energy hub level and the adjustment of the methane tank are in different time scales, the scheduling time of the energy hub level is set to be 1 hour once, and the methane tank is adjusted every 10 minutes within the hour.
4. The biogas tank energy status-based biogas charge and discharge control method according to claim 3, wherein the following information is obtained by the biogas tank energy status estimation method during the charging and discharging regulation of the biogas tank and the energy hub level regulation:
1) biogas tank SOEtank；
2) Pressure P in the biogas tanktank；
3) Average pressure P of methane delivery pipelinetube；
And judging whether the energy stored in the methane tank can meet the supply and demand requirements and whether the pressure of the methane tank and the methane conveying pipeline is in a safe range according to the information.
5. The biogas charge/discharge control method based on the energy state of the biogas tank as claimed in claim 4, wherein the control method is based on the SOE of the biogas tanktankPressure P in the methane tanktankAnd the average pressure P of the methane delivery pipelinetubeThe method for judging whether the pressure of the methane tank and the methane delivery pipeline is in a safe range comprises the following steps:
judging the SOE of the methane tanktankPressure P in the methane tanktankAnd the average pressure P of the methane delivery pipelinetubeWhether the following constraints are satisfied:
SOEmin＜SOEtank＜SOEmax
0＜Ptank＜Ptank-max
0＜Ptube＜Ptube-max
wherein, SOEmaxIs the maximum energy allowed to be stored in the methane tank, SOEminIs the lowest energy, P, which is required by the biogas tank to meet the current supply and demand relationship and should be storedtank-maxIs the maximum pressure, P, allowed by the methane tanktube-maxThe maximum average pressure allowed by the biogas pipeline;
average pressure P of biogas pipelinetubeCan be calculated from the following formula:
in the formula: ptube: the average pressure of the biogas pipelines;
P1: the initial end pressure of the biogas pipeline;
P2: the pressure at the tail end of the methane pipeline.
6. A biogas charging and discharging control system based on the energy state of a biogas tank is characterized by comprising a wind energy-light energy-biomass energy-water energy hub frame, wherein the energy hub frame comprises a biogas energy storage system used for storing biogas, and the biogas charging and discharging control system based on the energy state of the biogas tank further comprises:
the biogas fluid network model establishing module is used for establishing a biogas fluid network model for describing a biogas transmission process according to the wind energy-light energy-biomass energy-water energy hub framework, wherein the biogas fluid network model is established according to a mass conservation equation by utilizing the dynamic fluid characteristics of biogas in the biogas energy storage system;
the biogas energy state estimation module is used for estimating the energy state of a biogas tank in the biogas energy storage system by adopting a preset method according to a biogas fluid network model, wherein the energy state estimation method of the biogas tank comprises the following steps:
the energy state of the methane tank under the rated state is represented by the following formula:
SOEN＝QNVN(1)，s.t.PNVN＝nNRTN(2)；
wherein, SOENIs the energy state of the methane tank in a rated state, PNFor rated pressure, TNTo rated temperature, VNIs the volume of the biogas, QNIs the heat value of the marsh gas under rated pressure, nNThe amount of the substances of the biogas under a rated state, R is a universal gas constant;
the energy state of the methane tank in the actual operation process is represented by the following formula:
SOE＝QNVbio(3)，s.t.PbioVbio＝nRTN(4)；
q is equal to QNI.e. Q is constant, the volume V of the biogasNWhen converted into PN，TNVolume V ofbio，PbioThe pressure of the methane tank after inflation and deflation is shown, and n is the amount of the substances of the methane;
from the above equations (2) and (4), it follows:
wherein P isbioCalculating according to the biogas fluid network model in the step S20;
calculating according to the formula (3) and the formula (5) to obtain the energy state of the methane tank at a certain moment;
the adjusting module is used for adjusting the methane charging and discharging of a methane tank in the methane energy storage system under the energy hub framework by adopting a preset method according to the estimated energy state of the methane tank, and further comprises: and adjusting the methane charging and discharging of the methane tank in the methane energy storage system under the energy hub framework according to the estimated energy state of the methane tank and the output condition of the new energy.
7. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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