CN109755965B - Operation control method of wind-solar power generation and hydrogen production and storage system - Google Patents
Operation control method of wind-solar power generation and hydrogen production and storage system Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 112
- 239000001257 hydrogen Substances 0.000 title claims abstract description 112
- 238000003860 storage Methods 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 69
- 238000010248 power generation Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 97
- 238000012544 monitoring process Methods 0.000 claims abstract description 51
- 239000000446 fuel Substances 0.000 claims description 50
- 238000004146 energy storage Methods 0.000 claims description 44
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 31
- 229910052760 oxygen Inorganic materials 0.000 claims description 31
- 239000001301 oxygen Substances 0.000 claims description 31
- 239000007787 solid Substances 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005338 heat storage Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000006870 function Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- 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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses an operation control method of a wind-solar power generation and hydrogen production and storage system, and relates to the technical field of new energy wind-solar power generation hydrogen production. A rectifier on the side of a wind power plant fan is connected with a grid-side inverter; the direct current bus is connected with a DC/DC super capacitor, and the rear part of the super capacitor is connected with a hydrogen production and storage system; the photovoltaic system is connected with a direct current bus in front of the super capacitor through the DC/DC and used as a power compensation unit of the wind power plant, and the wind power and hydrogen generation hydrogen storage system further comprises a power coordination control module and a monitoring module, wherein the problems of poor peak regulation capability, unsmooth hydrogen generation, short equipment service life and the like of the wind power generation and hydrogen generation hydrogen storage system are mainly solved.
Description
Technical Field
The invention relates to the technical field of new energy wind-solar power generation hydrogen production, in particular to an operation control method of a wind-solar power generation and hydrogen production and storage system.
Background
With the rapid development of modern society, the demand for energy has reached a stage of rapid increase. Not only the shortage of electric energy, but also the serious air pollution caused by the refrigerating and heating system. The problems of energy safety, supply and demand matching and the like are increasingly highlighted. Resources such as wind and light are beginning to be spotlighted. Wind power grid connection difficulty is caused by the characteristics of randomness, volatility and irregularity of wind energy, the impact on a power grid is large, and the abandoned wind quantity is high. The wind power generation system cannot meet the requirements of late and high load peaks. Enhancing the peak regulation capability of the system and improving the energy utilization rate are still main targets. Meanwhile, balancing the power of the wind power system is also a subject to be researched urgently, and how heat energy and oxygen generated in the hydrogen production and storage process are recycled has great significance on how users in areas near the wind power plant utilize wind, light and heat resources to a greater extent for energy conservation and emission reduction.
According to the traditional wind-solar energy storage system grid-connected control method, on one hand, the utilization efficiency of new energy caused by mismatching between wind power plants and power grid dispatching indexes is low; oxygen and heat generated by the hydrogen production and storage system are directly discharged, and zero carbon emission cannot be realized by energy consumed by people in life. On the other hand, the hydrogen production is not smooth, and the service life of the equipment is short; in addition, extreme conditions are not considered in the control method, and the complementarity of wind energy and light energy is neglected, so that certain devices in the energy storage system are quitted, and the service life of equipment is influenced.
Disclosure of Invention
The invention provides an operation control method of a wind-solar power generation and hydrogen production and storage system, which mainly solves the problems that the peak regulation capacity of the wind-solar power generation and hydrogen production and storage system cannot meet the requirement of late and high load peak, wind energy has large impact on a power grid, grid connection is difficult, hydrogen production is not smooth, the service life of equipment is short, and the energy utilization rate is low. The invention has the characteristics of strong system peak regulation capacity, capability of meeting the requirement of late peak load, capability of ensuring the smoothness of hydrogen production, prolonging the service life of equipment and capability of flexibly connecting to the grid on the premise of ensuring the purity of the hydrogen production.
In order to achieve the purpose, the invention adopts the technical scheme that: the AC/DC rectifier on the wind power plant fan side is connected with the grid side DC/AC inverter, and the other end of the grid side DC/AC inverter is connected with a transformer on a power grid alternating current bus; the direct current bus is connected with a DC/DC super capacitor, and the rear part of the super capacitor is connected with a hydrogen production and storage system; the photovoltaic system is connected with a direct current bus in front of the super capacitor through DC/DC and used as a power compensation unit of the wind power plant; the power coordination control module is connected with the monitoring module. The super capacitor is matched with the power coordination control module to enable the hydrogen production system to work in a constant power state, so that the wind power plant is flexibly connected to the grid.
Preferably, the hydrogen production and storage system comprises a solid oxide electrolysis cell and a hydrogen-air fuel cell, wherein the input end of the solid oxide electrolysis cell and the output end of the hydrogen-air fuel cell are connected with a direct current bus behind the super capacitor through a multi-port DC/DC converter; the output end of the solid oxide electrolytic cell is connected with an energy storage device through an oxygen storage device and an internal combustion engine, and the energy storage device is connected with the input end of the solid oxide electrolytic cell through DC/DC; the output end of the solid oxide electrolytic cell is connected with the input end of the hydrogen-air fuel cell through a hydrogen storage device; the heat energy generated by the hydrogen-air fuel cell and the internal combustion engine is used for the solid oxide electrolytic cell to carry out chemical reaction; the hydrogen production and storage system absorbs and compensates the system power based on hydrogen energy, ensures the smooth power of the grid-connected point, and takes the energy storage device as a system standby power supply.
Preferably, a high-voltage electrical switch is arranged on a line between the DC/DC output end of the photovoltaic system and the direct current bus in front of the super capacitor.
Preferably, the wind-solar power generation and hydrogen production and storage system is characterized in that: the photovoltaic system is also provided with a cold and hot system, and a DC/DC output end of the photovoltaic system is connected with the cold and hot system through a high-voltage electrical switch; when the hydrogen production and storage system can meet the system requirements, the photovoltaic system is connected with a user to refrigerate and heat the user; when the hydrogen production and storage system cannot balance the system power, the photovoltaic system or the cold and hot system is connected to the wind power system, so that the limit problem of the hydrogen production and storage system is solved; the heat storage tank and the closed water cold storage tank meet the cold and heat requirements of users, and provide heat energy for the solid oxide electrolytic cell together with the hydrogen-air fuel cell so as to provide refrigeration for the internal combustion engine; the cold and hot system can be used as a power consumption unit of the wind power plant; the heat energy generated by the internal combustion engine is used for the solid oxide electrolytic cell to carry out chemical reaction.
The operation control method of the wind-solar power generation and hydrogen production and storage system is characterized by comprising the following steps: firstly, a monitoring system needs to establish communication with a power coordination control and monitoring module to acquire various monitoring data of the wind-solar power generation and hydrogen production and storage system; comparing the power of the wind power plant with the power required by the power grid through analyzing the obtained monitoring data, distributing the operating power of each system according to the difference value of the power of the wind power plant and the power required by the power grid, and simultaneously feeding back the distribution data and the operating state to the power coordination control and monitoring module; the hydrogen production system converts the redundant wind energy into hydrogen energy for storage after receiving the power signal; when the system has the shortage power, the fuel cell consumes hydrogen for compensation, the super capacitor absorbs the high-frequency power of the system and compensates the difference value between the hydrogen production system and the rated power of the hydrogen production system, and when the system is balanced, the system is flexibly connected to the grid.
Preferably, the method is characterized by comprising the following steps:
A. establishing low-bandwidth communication between the controller of each converter and the power coordination control module and the monitoring module: the controller of each converter adopts the self-adaptation PI controller, gathers the monitoring data of each monitoring system, and the monitoring data includes a plurality of or all of following: the system comprises wind power plant power, upper-level power grid dispatching power, power of a cold and hot system, user power, photovoltaic system power, overall power of a solid oxide electrolytic cell group/hydrogen fuel cell group, oxygen/hydrogen storage tank pressure, power and state of charge (SOC) of an energy storage device, and voltage and power of a super capacitor; the monitoring data are sequentially connected with an input interface of the ARM processor, and output ports of power reference values of all parts are determined;
B. the difference value between the equipment power in the current working state and the dispatching index of the superior power grid and the user load is calculated through data acquisition and judgment of a processor ARM, the difference value signal passes through a high/low pass filter in parallel, the output power value of the low pass filter is distributed to a hydrogen production and storage system, the output power value of the high pass filter is delivered to a super capacitor, and a high frequency component and a low frequency component are divided by taking the delivery frequency as a boundary; further obtaining the number of devices connected into the electrolytic cell or the fuel cell; if the equipment needs to be disconnected from running, the equipment with the longest working time is shut down firstly; and whether the system is connected to a photovoltaic system; calculating power following reference values of the converters of the control units: by means of a power-current double closed-loop control, PrefInputting a difference value of the power P of the control object and the power PI regulator, inputting a quotient of a power loop output value and voltage into the current PI regulator as a difference value of a reference value of current and a controlled object to obtain a numerical value for amplitude limiting, obtaining a PWM waveform by utilizing the ARM, and changing a duty ratio through the PWM waveform to realize converter control;
C. determining U of supercapacitor using fuzzy logic control in control of supercapacitorhighAnd Ulow: collecting the voltage sum P of the super capacitorseData, respectively multiplied by 1/USCmaxAnd 1/PwindChanging the actual value into fuzzy value, inputting into fuzzy controller, regulating by fuzzy rule, and determining U by using output variable to solve fuzzyhighAnd UlowSize;
D. and realizing mode selection: measuring signals such as power, voltage, current, pressure and the like through a sensor, a mutual inductor and the like, selecting a system operation mode, and calculating power reference values of a fan interface converter, a photovoltaic interface converter, an alternating current load interface converter, a grid-connected interface converter, a multi-port converter, an energy storage interface converter and a super capacitor interface converter; the reference value of the power is input to the controller of the corresponding interface converter through low bandwidth communication, after the reference value of the power is received, each unit interface converter works along with the reference signal, when the instruction is consistent, the current running state is kept, and when the instruction is inconsistent, the running mode is changed, and the updating value is quickly followed.
Preferably, the method is characterized in that in the step C, the voltage argument {0.9, 0.6, 0.3} of the super capacitor is PseThe universe of discourse { -1, -0.5, 0, 0.5, 1}, and the setting UhighOr UlowThe number of (a) is 6: PB, very large; PM, greater; PS, large; ZE, medium; NS, smaller; NM, very small; determining the membership function by using the universal membership function evalmf, wherein the fuzzy rule is as follows:
in the table, the abscissa is the voltage of the super capacitor, and the ordinate is PseThe middle part is Uhigh/UlowThe setting being of a magnitude such as PB, P when the supercapacitor voltage is PB, PseVoltage U of super capacitor at PBhighSet to PB, then UlowHas no effect on the operation of the supercapacitor, so that UhighAnd UlowThe same fuzzy rule table may be used.
Preferably, the control of the supercapacitor is artificially set to three voltage ranges, as shown in equation (1) (U)SCmin<Uhigh<USCmax,USCmin<Ulow<USCmax) (ii) a Three voltage ranges correspond to three working states (state 1 with over-high voltage and no charging, state 2 with charging and discharging, state 3 with over-low voltage and no discharging), and the bar of the super capacitor switching voltage rangeMember ηSC→ηSClowEta. same as the conditions for the mode 1 to mode 3 of the electrolyzerSC→ηSChighThe same conditions as in the fuel cell operation modes 8 to 9; the super capacitor works with the fuel cell or the electrolytic cell according to the running state of the system;
USCminand USCmaxIs an inherent characteristic of the super capacitor and needs to be selected according to system requirements, and UhighAnd UlowThe selected constant value can influence whether the super capacitor can continuously cooperate with the system to work after long-time charging or discharging, so that the acquired P is controlled by adopting fuzzy logicseFuzzifying data and supercapacitor voltage, carrying out scale transformation on input quantity, determining fuzzy language of multiple input quantities and membership function, defuzzifying fuzzified output quantity, and determining supercapacitor UhighAnd Ulow。
Preferably, the mode selection is a multiple power coordination limit state solution:
the meanings of the symbols in the following modes are as follows: pwindRepresenting wind power, PusersRepresenting user power, PnetIndicating superior grid dispatching index.，PPVRepresenting the power of the photovoltaic system, PSRepresenting energy storage device power, PhlIndicating the power of the cold and hot system, PSCRepresenting the power of the supercapacitor, PnIndicating power of the internal combustion engine, FH2Denotes the hydrogen storage tank pressure, FO2Denotes the pressure of the oxygen storage tank, PfcRepresenting the power of the hydrogen-air fuel cell, PELIndicating the rated power of the cell, Pse＝Pwind+PPV+PS-Pusers-Pnet-Phl，ηSC、ηSClow、ηSChighRespectively representing a rated voltage range, a low voltage range, a high voltage range, UscRepresenting super capacitor electricityPress Uhigh、UlowThe voltage boundary values in the high-voltage and low-voltage ranges of the super capacitor are represented, and m and k are positive integers between 0 and n and t respectively; in the subscript, ref is taken as reference power, and max and min are respectively maximum and minimum values;
judgment of Pwind>Pusers+Pnet，PfcrefWhen P is equal to 0PV＝PS＝Phl＝Pn＝0；
Mode 1: judging whether all the electrolytic tanks can meet the power Pse，mPEL>Pse>0 and super capacitor voltage UscDoes not reach the maximum limit voltage USCmaxM-1 electrolytic cells with rated power PELThe operation is carried out, the electrolytic tank is enabled to work to electrolyze water to produce hydrogen, and the operation reference power of the super capacitor is set to be PSCref＝Pse-mPEL，
Mode 2: if the remaining chargeable space of the super capacitor is not enough at the moment, P isSC+mPEL<PseThe energy storage equipment releases electric energy to lead the power of the energy storage equipment in rated operation of the electrolytic cell to be PSref＝Pse-PSCmax-mPEL；
Mode 3: if U isSC＝USCmaxOpening m electrolytic cells to obtain Pse-mPEL<0, system power changes from excess to insufficient Pse>0→Pse<0, the super capacitor P at this timeSCref＝mPEL-PseThe discharged power makes up the shortage of system power;
mode 4: if the pressure of the hydrogen storage unit FH2<FH2maxIf the upper limit is not reached, the hydrogen gas is continuously stored;
mode 5: if FH2>FH2maxTo the upper limit, the electrolysis cell mP is closedELWhen the hydrogen generation is stopped at 0, the fuel cell cannot operate, and the switch K is closed1、K2Connected to photovoltaic and cold-hot system, due to the power P of the photovoltaic systemPVIs not controllable, so that P is presentPV≠0，PS≠0，PhlNot equal to 0, wind and lightCooling or heating the system for the user, and judging the working state of the system again by the system;
mode 6: if the pressure F of the oxygen storage deviceO2<FO2maxIf the upper limit is not reached, the oxygen is consumed through the internal combustion engine, and the generated electric energy is stored in the energy storage device and supplied to the electrolytic cell for standby;
mode 7: if Pse>tPELAll the electrolytic cells are opened and connected to the photovoltaic and cooling-heating system, and P is measured at the momentPV≠0，PS≠0，Phl≠0，PnWhen the system power is equal to 0, the energy storage device and the super capacitor absorb energy and rebalance the system power;
when the wind energy is less than the sum P of the user power and the internet powerwind<PusersFirstly, the load of local users is satisfied, and the power of the solid oxide electrolytic cell is zero PELref＝0，Pse<0；
Mode 8: if kPfc>|Pse|>0 and USC>USCminThen k-1 fuel cells compensate the system power with constant power, | PSCref|＝|Pse|-kPfcIf the remaining space of the super capacitor is insufficient | PSC|+kPfc<|PseIf yes, the energy storage equipment is accessed to complement the residual power PSref＝|Pse|-|PSC|-kPfc；
Mode 9: if U isSC＝USCminTurning on k fuel cells, Pse<0→Pse>0, then | Pse|-kPfc>0, the super capacitor absorbs the excess power | PSCref|＝kPfc-|Pse|；
Mode 10: if the pressure of the hydrogen storage unit FH2＝FH2minReaches the lower limit value, disconnect K4Starting the energy storage device to operate the electrolytic hydrogen production P at the maximum value not exceeding the power required by the fuel cellSref＝Pse-kPfcIf the chemical reaction is too slow to meet the requirements of the fuel cell, the switch K is closed1Opening K2、K3The photovoltaic system is connected, the heat storage tank and the closed water cold storage tank continuously meet the cold and heat requirements of usersAnd (6) obtaining. Because the power supplied by the photovoltaic system is determined by the current illumination condition, the power is rebalanced together with the super capacitor;
mode 11: the oxygen storage device has not reached the upper pressure limit FO2<FO2maxThe electrolytic cell can continue to operate to generate oxygen;
mode 12: if the oxygen storage equipment reaches the upper pressure limit F at the momentO2<FO2maxStarting the internal combustion engine to consume oxygen, and if the SOC of the energy storage device is 1, supplying power P to the direct current bus in cooperation with the fuel cellSref＝PS+kPfc；
Mode 13: if Pse>tPfcAll fuel cells are put into operation, and the energy storage equipment and the super capacitor supply power P to the direct current busse＝|PSC|+tPfc+PS；
Mode 14: when all accessible power supply devices are inoperative Pse<|PSC|+tPfc+PSAccess to photovoltaic systems, PPVNot equal to 0, rebalancing the power level.
The invention has the positive effects that: the invention mainly solves the problems that the peak regulation capability of a wind-solar power generation and hydrogen production hydrogen storage system is poor and cannot meet the requirement of late and high load, the wind energy has large impact on a power grid and is difficult to grid, hydrogen production is not smooth, the service life of equipment is short, and the energy utilization rate is low. The invention effectively solves the problem by utilizing the super capacitor, the power coordination control module and the monitoring module. The invention has the characteristics of strong system peak regulation capacity, capability of meeting the requirement of late peak load, capability of ensuring the smoothness of hydrogen production, prolonging the service life of equipment, capability of flexibly combining networks on the premise of ensuring the purity of the hydrogen production and high energy utilization rate.
And the traditional control mode only divides the system operation mode through the direct current bus voltage. The active power fluctuation of a grid-connected point is caused by the mismatching between the wind power plant and the power grid dispatching index, the equipment operation and the hydrogen production and storage system reaching the limit, the wind abandon is easy to occur, and the control mode has higher requirement on the equipment capacity. The invention solves the problems of complex time sequence and low energy utilization rate between the wind power field and the power grid dispatching index in the prior art, ensures the smooth input power of the hydrogen production system, improves the hydrogen purity, prolongs the service life of equipment, reduces the system cost, and overcomes the defect that the prior art only divides the working mode according to the DC bus voltage. While the system is capable of forming an electro-hydro-electro cycle, the chemical reactions of hydrogen generation and utilization are slow, requiring a super capacitor to track the rapid response of the system changes. The super capacitor can still work with the system after reaching the limit voltage, the probability of the operation quit can be reduced by selecting the super capacitor with smaller capacity through fuzzy control, and the super capacitor can be kept in a chargeable and dischargeable state to resist the change of the system for a period of time in the future. The operation strategy of the whole system is matched with the working mode of the super capacitor, so that the extreme conditions of the system are solved, for example: wind power is low, load demand increases suddenly, but hydrogen storage is low (or wind power is high, load demand is low, hydrogen storage is high). The byproduct oxygen of hydrogen production enters the internal combustion engine on site, and the generated electric energy is used as a standby power supply of the system, so that the oxygen transportation cost is saved. The photovoltaic system is used as a main energy source for the cold and hot demands of users, and the problem of environmental pollution in the heating season can be effectively solved. Secondly, utilize domestic waste water to wash photovoltaic cell board, prolong photovoltaic system life-span. The problem of local consumption of redundant grid-connected wind power is solved through a cold and hot system, and heat energy generated by the cold and hot system and a fuel cell is used for a solid oxide electrolytic cell to generate chemical reaction. Therefore, the problem that the high-permeability wind power is connected into a power grid is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention.
FIG. 2 is a system flow diagram of an embodiment of the present invention.
Fig. 3 is a control structure diagram for realizing continuous operation of the super capacitor according to the embodiment of the present invention.
FIG. 4 illustrates a system control monitor circuit according to an embodiment of the present invention.
Fig. 5 shows the active power of the grid-connected point.
The method comprises the following steps of (1) meaning of a number in a graph, a photovoltaic power signal 2, a wind power signal 3, a power reference signal 4 of a photovoltaic system, a voltage and power signal 5 of a super capacitor, a control signal 6 of a wind power plant rectifier, a power reference signal 7 of the super capacitor, a power signal 8 of a cold and hot system, a power reference signal and a temperature signal 9 of a fuel cell and an electrolytic cell, a power signal of a grid-connected point and a wind power plant inverter control signal 10, a pressure signal 11 of a hydrogen storage device, a power and temperature signal 12 of an internal combustion engine, a pressure signal 13 of an oxygen storage device, a power reference signal and an SOC monitoring signal 14 of an energy storage device, a power signal of a user electric load and a power signal 15, and an upper-level power grid dispatching index signal.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Reference is made to the accompanying drawings. The invention is now explained, as a specific embodiment provided by the invention, the technical scheme adopted by the invention is as follows: the AC/DC rectifier on the wind power plant fan side is connected with the grid side DC/AC inverter, and the other end of the grid side DC/AC inverter is connected with a transformer on a power grid alternating current bus; the direct current bus is connected with a DC/DC super capacitor, and the rear part of the super capacitor is connected with a hydrogen production and storage system; the photovoltaic system is connected with a direct current bus in front of the super capacitor through DC/DC and used as a power compensation unit of the wind power plant; the power coordination control module is connected with the monitoring module. The monitoring module comprises a wind power, photoelectricity, a super capacitor and power monitoring of a grid-connected point, voltage monitoring of the super capacitor and a hydrogen production and storage system monitoring system; SOC and power monitoring of the energy storage device, temperature monitoring system and the like; the super capacitor is matched with the power coordination control module to enable the hydrogen production system to work in a constant power state, so that the wind power plant is flexibly connected to the grid.
Compared with the prior art, the invention mainly solves the problems that the peak regulation capability of the wind-solar power generation and hydrogen production and storage system is poor and cannot meet the requirement of late peak load, the wind energy has large impact on a power grid and is difficult to be combined into the power grid, the hydrogen production is not smooth, the service life of equipment is short and the energy utilization rate is low. The invention effectively solves the problem by utilizing the super capacitor, the power coordination control module and the monitoring module. The invention has the characteristics of strong system peak regulation capacity, capability of meeting the requirement of late peak load, capability of ensuring the smoothness of hydrogen production, prolonging the service life of equipment and capability of flexibly connecting to the grid on the premise of ensuring the purity of the hydrogen production.
As a specific embodiment provided by the invention, a three-phase PWM rectifier on the fan (50kW) side is connected with a three-phase DC/AC inverter on the grid side, and the other end of the DC/AC inverter on the grid side is connected with a transformer on a 20kV power grid alternating current bus; a DC/DC super capacitor (15F) is connected to the 1kV direct current bus, and a hydrogen production and storage system (an electrolytic cell and a fuel battery pack of 50kW) is connected behind the super capacitor; the photovoltaic system is connected with a direct current bus in front of the super capacitor through DC/DC and used as a power compensation unit of the wind power plant, and the photovoltaic system also comprises a power coordination control module and a monitoring module, wherein the monitoring module is connected with the power coordination control module; the monitoring module comprises a wind power system, a photoelectric system, a cold and hot system, a super capacitor and a power monitoring system of a grid-connected point, a voltage monitoring system (580V-400V) of the super capacitor and a monitoring system of a hydrogen production and storage system; SOC and power monitoring of the energy storage device and a temperature monitoring system; the super capacitor is matched with the power coordination control module to enable the hydrogen production system to work in a constant power state. (10%<FO2/FO2maxOr FH2/FH2max<90％，20％<SOC<90％)
As a specific embodiment provided by the present invention, preferably, the hydrogen production and storage system includes a solid oxide electrolysis cell and a hydrogen-air fuel cell, and the input end of the solid oxide electrolysis cell and the output end of the hydrogen-air fuel cell are both connected to a DC bus behind the supercapacitor through a multi-port DC/DC converter; the output end of the solid oxide electrolytic cell is connected with an energy storage device through an oxygen storage device and an internal combustion engine, and the energy storage device is connected with the input end of the solid oxide electrolytic cell through DC/DC; the output end of the solid oxide electrolytic cell is connected with the input end of the hydrogen-air fuel cell through a hydrogen storage device; the heat energy generated by the hydrogen-air fuel cell and the internal combustion engine is used for the solid oxide electrolytic cell to carry out chemical reaction; the hydrogen production and storage system absorbs and compensates the system power based on hydrogen energy, ensures the smooth power of the grid-connected point, and takes the energy storage device as a system standby power supply.
As a specific embodiment provided by the present invention, preferably, a high voltage electrical switch is disposed on a line between the DC/DC output terminal of the photovoltaic system and the DC bus in front of the super capacitor.
The cold and hot system that this patent relates to is through the system that has refrigeration heat supply function that electric heat pump unit and heat accumulation jar and closed water hold cold jar are constituteed.
As a specific embodiment provided by the present invention, preferably, the wind-solar power generation and hydrogen production and storage system is characterized in that: the photovoltaic system is also provided with a cold and hot system, and a DC/DC output end of the photovoltaic system is connected with the cold and hot system through a high-voltage electrical switch; when the hydrogen production and storage system can meet the system requirements, the photovoltaic system is connected with a user to refrigerate and heat the user; when the hydrogen production and storage system cannot balance the system power, the photovoltaic system or the cold and hot system is connected to the wind power system, so that the limit problem of the hydrogen production and storage system is solved; the heat storage tank and the closed water cold storage tank meet the cold and heat requirements of users, and provide heat energy for the solid oxide electrolytic cell together with the hydrogen-air fuel cell so as to provide refrigeration for the internal combustion engine; the cold and hot system can be used as a power consumption unit of the wind power plant; the heat energy generated by the internal combustion engine is used for the solid oxide electrolytic cell to carry out chemical reaction.
As a specific embodiment provided by the invention, the operation control method of the wind-solar power generation and hydrogen production and storage system is characterized by comprising the following steps: firstly, a monitoring system needs to establish communication with a power coordination control and monitoring module to acquire various monitoring data of the wind-solar power generation and hydrogen production and storage system; comparing the power of the wind power plant with the power required by the power grid through analyzing the obtained monitoring data, distributing the operating power of each system according to the difference value of the power of the wind power plant and the power required by the power grid, and simultaneously feeding back the distribution data and the operating state to the power coordination control and monitoring module; the hydrogen production system converts the redundant wind energy into hydrogen energy for storage after receiving the power signal; when the system has the shortage power, the fuel cell consumes hydrogen for compensation, the super capacitor absorbs the high-frequency power of the system and compensates the difference value between the hydrogen production system and the rated power of the hydrogen production system, and when the system is balanced, the system is flexibly connected to the grid.
Thereby further improving the utilization rate of energy.
As a specific embodiment provided by the present invention, it is preferable that the method comprises the steps of:
A. establishing low-bandwidth communication between the controller of each converter and the power coordination control module and the monitoring module: the controller of each converter adopts the self-adaptation PI controller, gathers the monitoring data of each monitoring system, and the monitoring data includes a plurality of or all of following: the system comprises wind power plant power, upper-level power grid dispatching power, power of a cold and hot system, user power, photovoltaic system power, overall power of a solid oxide electrolytic cell group/hydrogen fuel cell group, oxygen/hydrogen storage tank pressure, power and state of charge (SOC) of an energy storage device, and voltage and power of a super capacitor; the monitoring data are sequentially connected with an input interface of the ARM processor, and output ports of power reference values of all parts are determined;
B. the difference value between the equipment power in the current working state and the dispatching index of the superior power grid and the user load is calculated through data acquisition and judgment of a processor ARM, the difference value signal passes through a high/low pass filter in parallel, the output power value of the low pass filter is distributed to a hydrogen production and storage system, the output power value of the high pass filter is delivered to a super capacitor, and a high frequency component and a low frequency component are divided by taking the delivery frequency as a boundary; further obtaining the number of devices connected into the electrolytic cell or the fuel cell; if the equipment needs to be disconnected from running, the equipment with the longest working time is shut down firstly; and whether the system is connected to a photovoltaic system; calculating power following reference values of the converters of the control units: by means of a power-current double closed-loop control, PrefOf power P to the control objectThe power loop is connected with the controlled object through the power loop, and the power loop is connected with the controlled object through the power loop;
C. determining U of supercapacitor using fuzzy logic control in control of supercapacitorhighAnd Ulow: collecting the voltage sum P of the super capacitorseData, respectively multiplied by 1/USCmaxAnd 1/PwindChanging the actual value into fuzzy value, inputting into fuzzy controller, regulating by fuzzy rule, and determining U by using output variable to solve fuzzyhighAnd UlowSize;
D. and realizing mode selection: measuring signals such as power, voltage, current, pressure and the like through a sensor, a mutual inductor and the like, selecting a system operation mode, and calculating power reference values of a fan interface converter, a photovoltaic interface converter, an alternating current load interface converter, a grid-connected interface converter, a multi-port converter, an energy storage interface converter and a super capacitor interface converter; the reference value of the power is input to the controller of the corresponding interface converter through low bandwidth communication, after the reference value of the power is received, each unit interface converter works along with the reference signal, when the instruction is consistent, the current running state is kept, and when the instruction is inconsistent, the running mode is changed, and the updating value is quickly followed.
As a specific implementation mode provided by the invention, the method is preferably characterized in that in the step C, the voltage argument of the super capacitor is {0.9, 0.6, 0.3}, PseThe universe of discourse { -1, -0.5, 0, 0.5, 1}, and the setting UhighOr UlowThe number of (a) is 6: PB, very large; PM, greater; PS, large; ZE, medium; NS, smaller; NM, very small; determining the membership function by using the universal membership function evalmf, wherein the fuzzy rule is as follows:
the abscissa of the table is a super capacitorMagnitude of voltage, ordinate PseThe middle part is Uhigh/UlowThe setting being of a magnitude such as PB, P when the supercapacitor voltage is PB, PseVoltage U of super capacitor at PBhighSet to PB, then UlowHas no effect on the operation of the supercapacitor, so that UhighAnd UlowThe same fuzzy rule table may be used.
As an embodiment provided by the present invention, it is preferable that the control of the supercapacitor artificially sets three voltage ranges as shown in formula (1) (U)SCmin<Uhigh<USCmax,USCmin<Ulow<USCmax) (ii) a Three voltage ranges correspond to three working states (a state 1 with overhigh voltage and no charging, a state 2 with charging and discharging, and a state 3 with overlow voltage and no discharging), the condition of the voltage range switched by the super capacitor, etaSC→ηSClowEta. same as the conditions for the mode 1 to mode 3 of the electrolyzerSC→ηSChighThe same conditions as in the fuel cell operation modes 8 to 9; the super capacitor works with the fuel cell or the electrolytic cell according to the running state of the system;
USCminand USCmaxIs an inherent characteristic of the super capacitor and needs to be selected according to system requirements, and UhighAnd UlowThe selected constant value can influence whether the super capacitor can continuously cooperate with the system to work after long-time charging or discharging, so that the acquired P is controlled by adopting fuzzy logicseFuzzifying data and supercapacitor voltage, carrying out scale transformation on input quantity, determining fuzzy language of multiple input quantities and membership function, defuzzifying fuzzified output quantity, and determining supercapacitor UhighAnd Ulow。
As a specific embodiment provided by the present invention, it is preferable that the mode selection is a solution for multiple power coordination limit states:
the meanings of the symbols in the following modes are as follows: pwindRepresenting wind power, PusersRepresenting user power, PnetIndicating superior grid dispatching index.，PPVRepresenting the power of the photovoltaic system, PSRepresenting energy storage device power, PhlIndicating the power of the cold and hot system, PSCRepresenting the power of the supercapacitor, PnIndicating power of the internal combustion engine, FH2Denotes the hydrogen storage tank pressure, FO2Denotes the pressure of the oxygen storage tank, PfcRepresenting the power of the hydrogen-air fuel cell, PELIndicating the rated power of the cell, Pse＝Pwind+PPV+PS-Pusers-Pnet-Phl，ηSC、ηSClow、ηSChighRespectively representing a rated voltage range, a low voltage range, a high voltage range, UscRepresenting the supercapacitor voltage, Uhigh、UlowThe voltage boundary values in the high-voltage and low-voltage ranges of the super capacitor are represented, and m and k are positive integers between 0 and n and t respectively; in the subscript, ref is taken as reference power, and max and min are respectively maximum and minimum values;
judgment of Pwind>Pusers+Pnet，PfcrefWhen P is equal to 0PV＝PS＝Phl＝Pn＝0；
Mode 1: judging whether all the electrolytic tanks can meet the power Pse，mPEL>Pse>0 and super capacitor voltage UscDoes not reach the maximum limit voltage USCmaxM-1 electrolytic cells with rated power PELThe operation is carried out, the electrolytic tank is enabled to work to electrolyze water to produce hydrogen, and the operation reference power of the super capacitor is set to be PSCref＝Pse-mPEL，
Mode 2: if the remaining chargeable space of the super capacitor is not enough at the moment, P isSC+mPEL<PseThe energy storage equipment releases electric energy to lead the power of the energy storage equipment in rated operation of the electrolytic cell to be PSref＝Pse-PSCmax-mPEL；
Mode 3: if U isSC＝USCmaxOpening m electrolytic cells to obtain Pse-mPEL<0, system power changes from excess to insufficient Pse>0→Pse<0, the super capacitor P at this timeSCref＝mPEL-PseThe discharged power makes up the shortage of system power;
mode 4: if the pressure of the hydrogen storage unit FH2<FH2maxIf the upper limit is not reached, the hydrogen gas is continuously stored;
mode 5: if FH2>FH2maxTo the upper limit, the electrolysis cell mP is closedELWhen the hydrogen generation is stopped at 0, the fuel cell cannot operate, and the switch K is closed1、K2Connected to photovoltaic and cold-hot system, due to the power P of the photovoltaic systemPVIs not controllable, so that P is presentPV≠0，PS≠0，PhlNot equal to 0, the wind and light refrigerate or heat for users together, and the system judges the working state of the system again;
mode 6: if the pressure F of the oxygen storage deviceO2<FO2maxIf the upper limit is not reached, the oxygen is consumed through the internal combustion engine, and the generated electric energy is stored in the energy storage device and supplied to the electrolytic cell for standby;
mode 7: if Pse>tPELAll the electrolytic cells are opened and connected to the photovoltaic and cooling-heating system, and P is measured at the momentPV≠0，PS≠0，Phl≠0，PnWhen the system power is equal to 0, the energy storage device and the super capacitor absorb energy and rebalance the system power;
when the wind energy is less than the sum P of the user power and the internet powerwind<PusersFirstly, the load of local users is satisfied, and the power of the solid oxide electrolytic cell is zero PELref＝0，Pse<0；
Mode 8: if kPfc>|Pse|>0 and USC>USCminThen k-1 fuel cells compensate the system power with constant power, | PSCref|＝|Pse|-kPfcIf the remaining space of the super capacitor is insufficient | PSC|+kPfc<|PseIf yes, the energy storage equipment is accessed to complement the residual power PSref＝|Pse|-|PSC|-kPfc；
Mode 9: if U isSC＝USCminTurning on k fuel cells, Pse<0→Pse>0, then | Pse|-kPfc>0, the super capacitor absorbs the excess power | PSCref|＝kPfc-|Pse|；
Mode 10: if the pressure of the hydrogen storage unit FH2＝FH2minReaches the lower limit value, disconnect K4Starting the energy storage device to operate the electrolytic hydrogen production P at the maximum value not exceeding the power required by the fuel cellSref＝Pse-kPfcIf the chemical reaction is too slow to meet the requirements of the fuel cell, the switch K is closed1Opening K2、K3And the photovoltaic system is connected, and the heat storage tank and the closed water cold storage tank continuously meet the cold and hot demands of users. Because the power supplied by the photovoltaic system is determined by the current illumination condition, the power is rebalanced together with the super capacitor;
mode 11: the oxygen storage device has not reached the upper pressure limit FO2<FO2maxThe electrolytic cell can continue to operate to generate oxygen;
mode 12: if the oxygen storage equipment reaches the upper pressure limit F at the momentO2<FO2maxStarting the internal combustion engine to consume oxygen, and if the SOC of the energy storage device is 1, supplying power P to the direct current bus in cooperation with the fuel cellSref＝PS+kPfc；
Mode 13: if Pse>tPfcAll fuel cells are put into operation, and the energy storage equipment and the super capacitor supply power P to the direct current busse＝|PSC|+tPfc+PS；
Mode 14: when all accessible power supply devices are inoperative Pse<|PSC|+tPfc+PSAccess to photovoltaic systems, PPVNot equal to 0, rebalancing the power level.
Those skilled in the art will appreciate that the foregoing aspects are not described.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes, modifications, and equivalents may be made in the above-described aspects or portions thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An operation control method of a wind-solar power generation and hydrogen production and storage system is characterized in that the system comprises: the AC/DC rectifier on the wind power plant fan side is connected with the grid side DC/AC inverter, and the other end of the grid side DC/AC inverter is connected with a transformer on a power grid alternating current bus; the direct current bus is connected with a DC/DC super capacitor, and the rear part of the super capacitor is connected with a hydrogen production and storage system; the photovoltaic system is connected with a direct current bus in front of the super capacitor through DC/DC and used as a power compensation unit of the wind power plant; the power coordination control module is connected with the monitoring module; the super capacitor is matched with the power coordination control module to enable the hydrogen production system to work in a constant power state, so that the wind power plant is flexibly connected to the grid;
the system operation control method comprises the following steps: the monitoring system needs to establish communication with the power coordination control and monitoring module to acquire various monitoring data of the wind-solar power generation and hydrogen production and storage system; comparing the power of the wind power plant with the power required by the power grid through analyzing the obtained monitoring data, distributing the operating power of each system according to the difference value of the power of the wind power plant and the power required by the power grid, and simultaneously feeding back the distribution data and the operating state to the power coordination control and monitoring module; the hydrogen production system converts the redundant wind energy into hydrogen energy for storage after receiving the power signal; when the system has the shortage power, the fuel cell consumes hydrogen for compensation, the super capacitor absorbs the high-frequency power of the system and compensates the difference value between the hydrogen production system and the rated power of the hydrogen production system, and when the system is balanced, the system is flexibly connected to the grid; the method specifically comprises the following steps:
A. establishing low-bandwidth communication between the controller of each converter and the power coordination control module and the monitoring module: the controller of each converter adopts the self-adaptation PI controller, gathers the monitoring data of each monitoring system, and the monitoring data includes a plurality of or all of following: the system comprises wind power plant power, upper-level power grid dispatching power, power of a cold and hot system, user power, photovoltaic system power, overall power of a solid oxide electrolytic cell group/hydrogen fuel cell group, oxygen/hydrogen storage tank pressure, power and state of charge (SOC) of an energy storage device, and voltage and power of a super capacitor; the monitoring data are sequentially connected with an input interface of the ARM processor, and output ports of power reference values of all parts are determined;
B. the difference value between the equipment power in the current working state and the dispatching index of the superior power grid and the user load is calculated through data acquisition and judgment of a processor ARM, the difference value signal passes through a high/low pass filter in parallel, the output power value of the low pass filter is distributed to a hydrogen production and storage system, the output power value of the high pass filter is delivered to a super capacitor, and a high frequency component and a low frequency component are divided by taking the delivery frequency as a boundary; further obtaining the number of devices connected into the electrolytic cell or the fuel cell; if the equipment needs to be disconnected from running, the equipment with the longest working time is shut down firstly; and whether the system is connected to a photovoltaic system; calculating power following reference values of the converters of the control units: by means of a power-current double closed-loop control, PrefInputting a difference value of the power P of a control object and the power PI regulator, inputting a quotient of a power loop output value and voltage into the current PI regulator as a difference value of a reference value of current and a controlled object to obtain a numerical value for amplitude limiting, obtaining a PWM waveform by utilizing an ARM, and changing a duty ratio through the PWM waveform to realize converter control;
C. determining U of supercapacitor using fuzzy logic control in control of supercapacitorhighAnd Ulow: collecting the voltage sum P of the super capacitorseData, respectively multiplied by 1/USCmaxAnd 1/PwindChanging the actual value into fuzzy value, inputting into fuzzy controller, regulating by fuzzy rule, and determining U by using output variable to solve fuzzyhighAnd UlowSize;
D. and realizing mode selection: measuring power, voltage, current and pressure signals through a sensor and a mutual inductor, selecting a system operation mode, and calculating power reference values of a fan interface converter, a photovoltaic interface converter, an alternating current load interface converter, a grid-connected interface converter, a multi-port converter, an energy storage interface converter and a super capacitor interface converter; the reference value of the power is input to the controller of the corresponding interface converter through low bandwidth communication, after the reference value of the power is received, each unit interface converter works along with the reference signal, when the instruction is consistent, the current running state is kept, and when the instruction is inconsistent, the running mode is changed, and the updating value is quickly followed.
2. The method of claim 1, wherein in step C, the ultracapacitor voltage domain {0.9, 0.6, 0.3}, PseThe universe of discourse { -1, -0.5, 0, 0.5, 1}, and the setting UhighOr UlowThe number of (a) is 6: PB, very large; PM, greater; PS, large; ZE, medium; NS, smaller; NM, very small; determining the membership function by using the universal membership function evalmf, wherein the fuzzy rule is as follows:
in the table, the abscissa is the voltage of the super capacitor, and the ordinate is PseThe middle part is Uhigh/UlowThe setting being of a magnitude such as PB, P when the supercapacitor voltage is PB, PseVoltage U of super capacitor at PBhighSet to PB, then UlowHas no effect on the operation of the supercapacitor, so that UhighAnd UlowThe same fuzzy rule table may be used.
3. The method for controlling the operation of the wind-solar power generation and hydrogen generation and storage system according to claim 1 or 2, characterized by coordinating the extreme state solutions for a plurality of powers:
the meanings of the symbols in the following modes are as follows: pwindRepresenting wind power, PusersRepresenting user power, PnetIndicating superior grid dispatching index.，PPVRepresenting the power of the photovoltaic system, PSRepresenting energy storage device power, PhlIndicating the power of the cold and hot system, PSCRepresenting the power of the supercapacitor, PnIndicating power of the internal combustion engine, FH2Denotes the hydrogen storage tank pressure, FO2Denotes the pressure of the oxygen storage tank, PfcRepresenting the power of the hydrogen-air fuel cell, PELIndicating the rated power of the cell, Pse＝Pwind+PPV+PS-Pusers-Pnet-Phl，ηSC、ηSClow、ηSChighRespectively representing a rated voltage range, a low voltage range, a high voltage range, UscRepresenting the supercapacitor voltage, Uhigh、UlowThe voltage boundary values in the high-voltage and low-voltage ranges of the super capacitor are represented, and m and k are positive integers between 0 and n and t respectively; in the subscript, ref is taken as reference power, and max and min are respectively maximum and minimum values;
judgment of Pwind>Pusers+Pnet，PfcrefWhen P is equal to 0PV＝PS＝Phl＝Pn＝0；
Mode 1: judging whether all the electrolytic tanks can meet the power Pse，mPEL>Pse>0 and super capacitor voltage UscDoes not reach the maximum limit voltage USCmaxM-1 electrolytic cells with rated power PELThe operation is carried out, the electrolytic tank is enabled to work to electrolyze water to produce hydrogen, and the operation reference power of the super capacitor is set to be PSCref＝Pse-mPEL，
Mode 2: if the remaining chargeable space of the super capacitor is not enough at the moment, P isSC+mPEL<PseThe energy storage equipment releases electric energy to lead the power of the energy storage equipment in rated operation of the electrolytic cell to be PSref＝Pse-PSCmax-mPEL；
Mode 3: if U isSC＝USCmaxOpening m electrolytic cells to obtain Pse-mPEL<0, system power changes from excess to insufficient Pse>0→Pse<0, the super capacitor P at this timeSCref＝mPEL-PseThe discharged power makes up the shortage of system power;
mode 4: if the pressure of the hydrogen storage unit FH2<FH2maxIf the upper limit is not reached, the hydrogen gas is continuously stored;
mode 5: if FH2>FH2maxTo the upper limit, the electrolysis cell mP is closedELWhen the hydrogen generation is stopped at 0, the fuel cell cannot operate, and the switch K is closed1、K2Connected to photovoltaic and cold-hot system, due to the power P of the photovoltaic systemPVIs not controllable, so that P is presentPV≠0，PS≠0，PhlNot equal to 0, the wind and light refrigerate or heat for users together, and the system judges the working state of the system again;
mode 6: if the pressure F of the oxygen storage deviceO2<FO2maxIf the upper limit is not reached, the oxygen is consumed through the internal combustion engine, and the generated electric energy is stored in the energy storage device and supplied to the electrolytic cell for standby;
mode 7: if Pse>tPELAll the electrolytic cells are opened and connected to the photovoltaic and cooling-heating system, and P is measured at the momentPV≠0，PS≠0，Phl≠0，PnWhen the system power is equal to 0, the energy storage device and the super capacitor absorb energy and rebalance the system power;
when the wind energy is less than the sum P of the user power and the internet powerwind<PusersFirstly, the load of local users is satisfied, and the power of the solid oxide electrolytic cell is zero PELref＝0，Pse<0；
Mode 8: if kPfc>|Pse|>0 and USC>USCminThen k-1 fuel cells compensate the system power with constant power, | PSCref|＝|Pse|-kPfcIf the remaining space of the super capacitor is insufficient | PSC|+kPfc<|PseIf yes, the energy storage equipment is accessed to complement the residual power PSref＝|Pse|-|PSC|-kPfc；
Mode 9: if U isSC＝USCminTurning on k fuel cells, Pse<0→Pse>0, then | Pse|-kPfc>0, the super capacitor absorbs the excess power | PSCref|＝kPfc-|Pse|；
Mode 10: if the pressure of the hydrogen storage unit FH2＝FH2minReaches the lower limit value, disconnect K4Starting the energy storage device to operate the electrolytic hydrogen production P at the maximum value not exceeding the power required by the fuel cellSref＝Pse-kPfcIf the chemical reaction is too slow to meet the requirements of the fuel cell, the switch K is closed1Opening K2、K3The photovoltaic system, the heat storage tank and the closed water cold storage tank are connected to continuously meet the cold and heat requirements of users; because the power supplied by the photovoltaic system is determined by the current illumination condition, the power is rebalanced together with the super capacitor;
mode 11: the oxygen storage device has not reached the upper pressure limit FO2<FO2maxThe electrolytic cell can continue to operate to generate oxygen;
mode 12: if the oxygen storage equipment reaches the upper pressure limit F at the momentO2<FO2maxStarting the internal combustion engine to consume oxygen, and if the SOC of the energy storage device is 1, supplying power P to the direct current bus in cooperation with the fuel cellSref＝PS+kPfc；
Mode 13: if Pse>tPfcAll fuel cells are put into operation, and the energy storage equipment and the super capacitor supply power P to the direct current busse＝|PSC|+tPfc+PS；
Mode 14: when all accessible power supply devices are inoperative Pse<|PSC|+tPfc+PSAccess to photovoltaic systems, PPVNot equal to 0, rebalancing the power level.
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