CN104821609B - Method for controlling wind-hydrogen energy storage coupling system connected with wind electric field in distributed manner - Google Patents
Method for controlling wind-hydrogen energy storage coupling system connected with wind electric field in distributed manner Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims description 17
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Abstract
The invention provides a method for controlling a wind-hydrogen energy storage coupling system connected with a wind electric field in a distributed manner. The method is based on a difference between an actual electric wind field output power and a local load and coordinates with an upper-grade electric network scheduling plane. A hydrogen energy storage equivalent SOC (state of charge) state is used as a judging basis for controlling power distribution of wind power integration and hydrogen energy storage in the wind-hydrogen energy storage coupling system. Through monitoring changes of an actual wind electric field output power Pwind, a local load Pload and the upper-grade electric network scheduling plane Pjh in a real-time online manner, a comparison result between the actual wind electric field output power Pwind and the local load Pload is acquired, and furthermore the comparison result is combined with the hydrogen energy storage equivalent SOC state for secondary comparison with the upper-grade electric network scheduling plane Pjh. A system power comparator transmits a control instruction to a power distribution executor according to the two comparison results. The power distribution executor controls distribution of a wind power, and simultaneously feeds a wind power integration power back to an upper-grade electric network scheduling department. The upper-grade electric network scheduling department controls a wind electric cluster in a coherency-based equivalence principle according to integration data which are fed back from each wind electric field.
Description
Technical Field
The invention relates to a control method of a wind-hydrogen energy storage coupling system.
Background
Due to the impact of large-scale wind power grid connection on a power grid, the intermittent and random wind resource and the wind power peak-back regulation characteristics, the problems of 'difficult internet surfing', high wind abandoning and the like of wind power generation are more and more serious. To date, researchers at home and abroad propose the following two types of solutions for improving the wind power grid-connected consumption capacity: (1) the power supply is flexibly adjusted by three energy storage types of physical energy storage, electromagnetic energy storage and chemical energy storage, the proportion of the flexible power supply in a power grid is improved, and the possibility of fast peak regulation of wind power and improvement of wind power absorption capacity is provided; (2) and the dispatching department controls, and the wind power balance area is effectively expanded by depending on strong cross-region and cross-country interconnected power grid support based on wind power distributed development. However, because the wind energy resources in China are unevenly distributed, namely, the wind energy resources are mainly concentrated in northwest, northwest and northeast regions, and are limited by the conditions of imperfect construction of trans-regional transmission channels, single power supply structure and the like, the two schemes cannot achieve ideal wind power absorption effect when being singly adopted.
In 11 months 2012, the national grid company promulgates the enterprise standard "specification of distributed wind power access to grid technology" (Q/GDW 1866-2012), wherein it is explicitly specified that a distributed wind farm is generally located near a user, and is mainly consumed on site, and a grid connection mode of multipoint access and unified monitoring is adopted. The distributed wind power generation system is characterized by multi-point access and centralized control, is greatly different from the distributed wind power generation system with the traditional single-point access, and lacks relevant technical standards and means at home and abroad at present, so that certain difficulty exists in the aspect of realization.
Under the prior art condition, the method combines the prior schemes (1) and (2), takes a wind power plant, an electrolytic bath, a hydrogen storage tank, a fuel cell and a coal chemical production line as main components of the system, mainly develops the wind power in a distributed manner, coordinates the local load of each wind power plant with the dispatching of a superior power grid, realizes the consumption of redundant wind power by using the hydrogen production and energy storage mode of electrolyzed water, regulates the easy wind power fluctuation through a hydrogen energy storage system when the power grid needs, improves the consumption capacity of the power grid on large-scale wind power integration, reduces the impact of the large-scale wind power integration on the power grid, and reduces the wind power generation and wind abandon rate, thereby being an effective means.
Related documents published in open are fresh at home and abroad in the research aspect of controlling the reasonable distribution of wind power according to the instruction of a superior power grid based on a hydrogen energy storage mode. At home and abroad, researchers mostly study on a centrally distributed wind power plant and an energy storage system, or explain on a distributed wind power grid-connected monitoring and scheduling strategy. For example, document 1(t.zhou, b.francis. modelingand control design for an active hydrogen/wind power system [ J ]. int.j.hydrogen Energy,2009,34(1):21-30.) is also mainly studied for the control of a centrally distributed wind farm and a hydrogen Energy storage system, and does not refer to the application of coordinated control of wind power integration and hydrogen Energy storage in a distributed wind farm. Document 2 (shenhan, huangshan mountain, centralized control scheme design and implementation [ J ] solar energy based on distributed wind power, 2013,13:22-25.) explains a distributed wind power system including four parts, namely a centralized control center and a local control of a wind power generation unit, but does not consider the influence of a hydrogen energy storage system on a control architecture, and does not deeply research a specific control strategy.
For another example, chinese patent 201110154373 proposes an active power distribution method for a wind-light storage and transmission integrated power station, which dynamically and uniformly coordinates each part of the wind-light storage and transmission integrated power station according to the set power of the wind-light storage and transmission integrated power station, so as to achieve the purposes of improving the utilization rate of wind energy and solar energy resources and prolonging the service life of power generation and energy storage devices. However, the distribution scheme is limited to the active power dispatching and distributing research of a single wind power plant combining a photovoltaic power station and energy storage, and the power distribution problem of coordination of multiple wind power plants and energy storage is not considered from the global perspective.
Disclosure of Invention
The invention aims to overcome the defects of difficult grid-connected consumption and large wind abandon of the existing large-scale wind power, and provides a wind-hydrogen energy storage coupling system control method for distributed access to wind power plants, so as to realize coordinated grid connection of wind power clusters and ensure that redundant wind power generates hydrogen and stores energy on the premise that each wind power plant normally operates corresponding to a local load, thereby consuming the wind power to the maximum extent.
The wind-hydrogen energy storage coupling system control method is based on the difference value of the actual output of the wind power plant and the local load, cooperates with a higher-level power grid dispatching plan, and controls the power distribution of wind power integration and hydrogen energy storage in the wind-hydrogen energy storage coupling system by taking the hydrogen energy storage equivalent SOC state as a judgment basis; monitoring actual output P of wind power plant in real-time online mannerwindLocal load PloadAnd the upper-level power grid dispatching plan PjhObtaining the actual output P of the wind power plantwindWith local load PloadComparing the result, and combining the comparison result with the hydrogen energy storage equivalent SOC state and the superior power grid dispatching plan PjhCarrying out secondary comparison; and the system power comparator sends the control instruction to the power distribution actuator according to the two comparison results, the power distribution actuator controls the distribution of the wind power, the wind power grid-connected power is fed back to the superior power grid for scheduling, and the superior power grid scheduling department regulates and controls the wind power cluster according to the grid-connected data fed back by each wind power plant on the basis of the principle of homodyne equivalence. Local and whole grid combination is formed, the upper level power grid dispatching and distribution mechanism is coordinated and controlled, further the actual output of the wind power plant is controlled to go, the actual power distribution value of wind power is optimized, the wind power integration and the distribution control of the hydrogen production and energy storage of wind power are realized,the wind power is smoothly connected to the grid and completely consumed, and the grid-connected power feedback helps the superior power grid to schedule, correct, adjust and send instructions in time, so that the wind power utilization rate and the wind power consumption capacity are improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
firstly, real-time monitoring is carried out to obtain the actual output P of the wind power plantwind(ii) a Secondly, combining the hydrogen energy storage equivalent SOC state and setting the actual output P of the wind power plantwindLocal load PloadAnd the upper-level power grid dispatching plan PjhComparing the three; then, the actuator outputs P to the wind power plant according to the comparison resultwindThe allocation is performed, and the allocation direction is four: and local load absorption is carried out, the load is merged into a superior power grid, hydrogen is produced for storing energy, and wind is abandoned. The local load consumption and the part of the. And finally, the wind power grid-connected part feeds back the grid-connected power to the upper-level power grid dispatching department.
The steps of the invention are as follows in sequence:
firstly, a wind power Maximum Power Point Tracking (MPPT) method is adopted, and the actual wind power plant output P is obtained through real-time monitoringwind。
Secondly, the actual output P of the wind power plantwindWith local load PloadComparing to obtain the actual output P of the wind power plantwindWith local load PloadDifference value P ofre(ii) a And comparing the actual output P of the wind power plant by taking the hydrogen energy storage equivalent SOC as a criterion, namely taking the pressure state in a hydrogen storage tank in the hydrogen energy storage system as a criterionwindWith local load PloadDifference value P ofreAnd the upper-level power grid dispatching plan Pjh. Based on the two comparisons, 6 allocation orientations were obtained:
(1) when P is presentreWhen the content is less than or equal to 0: complete integration of wind power, Ps＝PwindActual output P of wind farmwindAll for local loads;
(2) when hydrogen energy storage equivalent SOC is equal to hydrogen energy storage equivalent SOCmaxAnd 0 is<Pre≤PjhThe method comprises the following steps: complete integration of wind power, Ps＝PwindActual output P of wind farmwindIn, PloadFor local loads, the actual field output PwindWith local load PloadDifference value P ofreThe system is used for being merged into an upper-level power grid;
(3) when hydrogen energy storage equivalent SOC is equal to hydrogen energy storage equivalent SOCmaxAnd 0 is<Pjh<PreThe method comprises the following steps: wind power is used for meeting the requirements of local load and wind abandon in the process of dispatching an upper-level power grid, wherein PloadFor local loads, PjhUsed for being merged into a superior power grid and abandoning wind power Pcur＝|Pjh-(Pwind-Pload)|；
(4) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreCan satisfy hydrogen energy storage, i.e. (P)re-PH)>When 0, consuming hydrogen energy storage power PHThen, there is (P)re-PH)≤PjhActual output P of wind farmwindWith local load PloadDifference value P ofreSubtracting the consumed hydrogen energy storage power PHI.e. (P)re-PH) All incorporated into the upper-level grid, Ps＝Pwind-PH；
(5) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreCan satisfy hydrogen energy storage, i.e. (P)re-PH)>When 0, consuming hydrogen energy storage power PHThen, there is (P)re-PH)>PjhActual output P of wind farmwindWith local load PloadDifference value P ofreSubtracting the consumed hydrogen energy storage power PHI.e. (P)re-PH) Is used for meeting the requirements of the remaining abandoned wind after the dispatching of the local load and the superior power grids＝Pload+PjhPower of abandoned wind Pcur＝Pwind-(Pload+PH+Pjh)；
(6) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreFailing to meet or just meeting the hydrogen energy storage, i.e. (P)re-PH) When the power is less than or equal to 0, the hydrogen energy storage power PHActual force P of wind farmwindWith local load PloadDifference value P ofreEqual, PH＝PreActual output P of wind farmwindWith local load PloadDifference value P ofreAll for energy storage.
Wherein, PwindFor the actual output of the wind farm, PloadFor local load, PreIs the difference between the actual output of the wind farm and the local load, PHStoring energy for hydrogen, PjhFor the upper-level power grid scheduling plan, wind power integration power PsFor meeting the local load power + merging into the upper-level grid wind power, PcurEquivalent SOC of hydrogen energy storage for abandoning wind powermaxIs the upper limit of the pressure state in the hydrogen storage tank in the hydrogen energy storage system.
For a single wind power plant, under an ideal condition, the real-time output of each single wind power plant must meet or exceed the sum of the local load demand, the local hydrogen energy storage demand and a superior power grid dispatching plan, so that the actual output of the wind power plant can not only ensure the normal operation of the local load, but also meet the operation of a local hydrogen energy storage system, and meet the superior power grid dispatching demand on the premise. For a cluster consisting of multiple wind power plants, the total wind power output of the cluster under an ideal condition must meet or exceed the total load demand of the cluster, hydrogen energy storage is preferentially carried out under the condition, and wind is abandoned for stopping the power plant urgently.
And finally, the upper-level dispatching department performs coordination distribution according to the clusters according to the grid-connected power fed back by each wind power plant. The distribution process follows a principle of 'homodyne equivalence', wherein 'homodyne' is understood as that a superior power grid dispatching department uniformly issues targeted instructions to each wind power plant from the whole; the equivalence represents that the cluster is equal in overall dynamic state, is understood as the sending of each instruction of the superior power grid dispatching, and is realized by converting the surplus output of the wind power cluster into hydrogen energy to be stored on the premise of ensuring that the overall total load demand of the system is met according to the capacity of each wind power plant. Through the coordination distribution mode, the defects of difficult grid connection, incomplete wind power consumption, high wind abandon rate and the like of a single wind power plant due to wind power randomness and volatility are overcome.
Drawings
FIG. 1 is a schematic diagram of a control flow of actual output distribution of a wind farm;
FIG. 2 is a power distribution control block diagram of a wind-hydrogen energy storage coupling system for distributed access to a wind power plant;
FIG. 3 is a schematic diagram of cluster scheduling of a distributed access wind farm.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
The actual output distribution control flow of the wind power plant in the invention is shown in figure 1. In order to overcome the fluctuation and randomness of wind power output and the randomness of local load, the invention provides a grid-connected and energy storage power distribution control method based on real-time monitoring of the actual output of a wind power plant. By the control method, the wind power is grid-connected according to the requirement, the wind power is adjusted when the wind power is lack of the grid-connected grid.
The specific control mode is as follows:
the actual output P of the wind power plantwindWith local load PloadComparing, and if the actual output of the wind power plant meets the residual power P after the local loadreLess than or equal to 0, the actual output of the wind power plant is all grid-connected Ps＝PwindAnd the method is used for supporting local load operation. If the actual output P of the wind power plantwindWith local load PloadDifference value P ofre>0, based on the hydrogen energy storage equivalent SOC state and the upper-level power grid dispatching plan PjhAnd continuing to judge:
when P is presentre>0 and hydrogen energy storage equivalent SOC (hydrogen energy storage equivalent SOC) ═ hydrogen energy storage equivalent SOCmaxWhen the hydrogen energy storage system reaches the upper energy storage limit, if P is reachedjh-PreThe actual output of the wind power plant can ensure that the local load normally operates but fails to meet or just meets the dispatching requirement of an upper-level power grid, and the actual output P of the wind power plant is more than or equal to 0windWith local load PloadDifference value P ofreAll the power grid is merged into a superior power grid; if Pjh-Pre<And 0, after the actual output of the wind power plant meets the local load and the superior power grid, remaining wind abandoning.
When P is presentre>0 and hydrogen energy storage equivalent SOC ≠ hydrogen energy storage equivalent SOCmaxWhen the hydrogen energy storage system does not reach the upper energy storage limit, the actual output P of the wind power plantwindWith local load PloadDifference value P ofreFirstly, hydrogen energy storage is carried out, if the hydrogen energy storage can not be met, the actual output P of the wind power plantwindWith local load PloadDifference value P ofreAll energy stored, PH＝Pre(ii) a If residual energy is left after energy storage, the hydrogen energy storage consumes power PHThen, if (P)re-PH)≤PjhThen (P)re-PH) All the grids are connected; if (P)re-PH)>PjhThen (P)re-PH) Satisfy superior power grid dispatching plan PjhAnd then the air is abandoned.
Wherein the equivalent SOC is used for representing the residual gas in the gas storage tank, which represents the residual pressure p of the gas storage tank after the gas storage tank is used for a period of time or is left unused for a long timevreAnd its pressure p when completely filled with gascapExpressed in percentage, i.e. equivalent SOC ═ pvre/pcap× 100%, representing the residual gas in the hydrogen storage tank in the hydrogen storage system by the hydrogen energy storage equivalent SOC, and the hydrogen energy storage equivalent SOCmaxIs the upper limit of the pressure state in the hydrogen storage tank in the hydrogen energy storage system.
The power distribution control of the wind-hydrogen energy storage coupling system for distributed access to the wind farm is shown in fig. 2, firstly, a wind power Maximum Power Point Tracking (MPPT) method is adopted to ensure that a fan is at the current optimal working point of wind speed, the efficient utilization of wind power output is ensured from the source, and the actual output P of the wind farm is obtained through real-time online monitoringwind(ii) a Then combining the hydrogen energy storage equivalent SOC state and the local load PloadAnd the upper-level power grid dispatching plan PjhAnd changing, and comparing in a system power comparator to obtain six results. The power comparator sends out a corresponding control instruction to the power distribution actuator according to the comparison result; the power distribution executor controls power distribution according to the received instruction, so that the actual output P of the wind power plantwindSix different directions were taken, as follows:
1. when P is presentwind≤PloadI.e. PreWhen the power is less than or equal to 0, the system power comparator sends an instruction 1 to the power distribution actuator, the system power distribution actuator controls the wind power grid-connected point to act, the hydrogen energy storage device does not act, at the moment, the wind power is completely connected to the grid, and the wind power grid-connected power Ps＝PwindHowever, at this time, the wind power output cannot support or can just support the normal operation of the local load, so that the condition is defined as 'lack', and the lack needs to be compensated by means of superior scheduling coordination.
2. When P is presentre>0 and hydrogen energy storage equivalent SOC (hydrogen energy storage equivalent SOC) ═ hydrogen energy storage equivalent SOCmaxWhen, if (P)jh-Pre) And if the wind power is not less than 0, the system power comparator sends an instruction 2 to the power distribution actuator, the power distribution actuator controls the wind power grid-connected point to act, the hydrogen energy storage device does not act, at the moment, the wind power is completely connected to the grid, and the wind power grid-connected power P iss＝PwindThe wind power output meets the local load but cannot or just meets the requirements of the superior scheduling, so that the condition is defined as 'lack' and needs to be supplemented by the superior scheduling coordination.
3. When P is presentre>0 and hydrogen energy storage equivalent SOC (hydrogen energy storage equivalent SOC) ═ hydrogen energy storage equivalent SOCmaxWhen, if(Pjh-Pre)<And 0, the system power comparator sends an instruction 3 to the power distribution actuator, the power distribution actuator controls the wind power grid-connected point to act, the hydrogen energy storage device does not act, at the moment, the actual output of the wind power plant meets the local load and is still remained but does not need to store energy after meeting the requirements of the upper-level power grid, therefore, the condition is defined as 'surplus', and the wind power meets the grid-connected power and then is abandoned.
4. When P is presentre>0 and hydrogen energy storage equivalent SOC ≠ hydrogen energy storage equivalent SOCmaxWhen, if PrePriority energy storage and surplus after energy storage, then Pjh-(Pre-PH) And when the power is more than or equal to 0, the system power comparator sends an instruction 4 to the power distribution actuator, the power distribution actuator controls the wind power grid-connected point to act, the hydrogen energy storage device acts, and the wind power output meets the requirements that the local load and the hydrogen energy storage cannot meet or just meet the requirements of superior scheduling.
5. When P is presentre>0 and hydrogen energy storage equivalent SOC ≠ hydrogen energy storage equivalent SOCmaxWhen, if PrePriority energy storage and surplus after energy storage, then Pjh-(Pre-PH)<When the power of the wind power system is 0, the system power comparator sends an instruction 5 to the power distribution actuator, the power distribution actuator controls the wind power grid-connected point to act, the hydrogen energy storage device acts, and at the moment, the wind power output sequentially meets the requirements of local load, hydrogen energy storage and superior dispatching, and the residual amount still remains, and the residual amount is abandoned, so that the condition is defined as 'residual';
6. when P is presentre>0 and hydrogen energy storage equivalent SOC ≠ hydrogen energy storage equivalent SOCmaxWhen, if PreThe system power comparator sends an instruction 6 to a power distribution actuator which controls the wind power grid-connected point to act and a hydrogen energy storage device to act, at the moment, the wind power meets the local load and then is stored fully, and P iss＝Pload，PH＝Pwind-PloadWind power output meets local load but cannot meet superior scheduling requirements, so this condition is the caseDefined as 'absence', and depends on upper-level scheduling coordination to make up for the absence.
Finally, wind power integration power P distributed by the power distribution executorsAnd feeding back to the upper-level scheduling, analyzing feedback data by the upper-level scheduling, and sending a next command according to a principle of 'coherent equivalence'.
Wherein, PwindFor the actual output of the wind farm, PloadFor local load, PreIs the difference between the actual output of the wind farm and the local load, PHStoring energy for hydrogen, PjhFor upper-level grid dispatching planning, PsFor wind-power integration power, wind-power integration power PsPower satisfying local load + power merged into upper grid, PcurEquivalent SOC of hydrogen energy storage for abandoning wind powermaxIs the upper limit of the pressure state in the hydrogen storage tank in the hydrogen energy storage system.
Fig. 3 is a schematic diagram of cluster scheduling implementation of a distributed access wind farm. As shown in fig. 3, a wind farm 1,2,3, …, n and a local load 1,2,3, …, n corresponding to the wind farm jointly form a wind power cluster, and the cluster is uniformly regulated and controlled by an instruction issued by a superior power grid, that is, the "homodyne equivalent" is "homodyne". From a cluster, a superior power grid dispatching department analyzes grid-connected power fed back by n wind power plantsi 1,2,3, …, n and local loads1,2,3, …, n is according to wind power integration total power Ps totalAnd cluster total load Pload assemblyAnd (3) carrying out macroscopic regulation and control on the dynamic equivalence, namely the equivalence principle in the 'homodyne equivalence'.
In this process, a single wind farm may have a regulation and control mode of a typical wind farm of a, b, c, d, e, f, 6 type, which is composed of wind farms and local loads corresponding to the wind farms in fig. 3:
wherein(j ═ a, b, c, d, e, f) is the actual output of the wind farm corresponding to the j-type regulation and control mode;(j ═ a, b, c, d, e, f) is the local load corresponding to the j-type regulation and control mode;(j is a, b, c, d, e, f) is the difference value between the actual output and the local load of the wind power plant corresponding to the j-type regulation and control mode;(j ═ a, b, c, d, e, f) is hydrogen energy storage power corresponding to j type regulation and control modes;(j ═ a, b, c, d, e, f) is a superior power grid dispatching plan corresponding to the j type regulation and control mode;(j is a, b, c, d, e, f) is wind power grid-connected power corresponding to the j type regulation mode, i.e. the power of the local load which is correspondingly met by the j type regulation mode + the wind power of the upper-level power grid which is correspondingly merged into the j type regulation mode,(j ═ a, b, c, d, e, f) is the wind power curtailment corresponding to j type regulation mode, hydrogen energy storage equivalent SOCjAnd (j ═ a, b, c, d, e and f) is the hydrogen energy storage system equivalent SOC corresponding to the j type regulation and control mode, and the hydrogen energy storage is equivalentAnd (j ═ a, b, c, d, e and f) is the upper limit of the pressure state in the hydrogen storage tank in the hydrogen energy storage system corresponding to the j-type regulation and control mode.
1. In the wind farm regulation represented by type a,namely, it isThe actual output of the wind power plant can not meet or just meet the local load, so the actual output of the wind power plant is completely combined to the grid,the upper-level power grid dispatching improves the grid merging amount of other wind power plants through regulating instructions, and makes up for the power shortage caused by the fact that the actual wind power output of the wind power plant of the type does not meet the self load;
2. in the wind farm regulation mode represented by the type b, whenTime, hydrogen energy storage equivalent SOCbHydrogen energy storage equivalentThe actual output of the wind power plant does not need to satisfy the hydrogen energy storage, andthe requirements of the upper-level power grid can not be met or just can be met, so that the actual output of the wind power plant is used for local load and then is completely merged into the upper-level power grid,the upper-level power grid dispatching improves the grid-connection quantity of other wind power plants through regulating instructions, and makes up for the power shortage caused by the fact that the actual wind power output of the wind power plant of the type does not reach the dispatching requirement of the upper-level power grid;
3. in the wind farm regulation mode represented by the type c, whenTime, hydrogen energy storage equivalent SOCcHydrogen energy storage equivalentWind power generationThe actual output of the field does not need to satisfy the requirement of hydrogen energy storage, andexceeds the requirements of the dispatching plan of the upper-level power grid, so that the wind power is used for local load and meets the dispatching requirements of the upper-level power grid,
4. in the wind farm regulation mode represented by the type d, whenTime, hydrogen energy storage equivalent SOCdNot equal to hydrogen energy storage equivalentThe actual output of the wind power plant needs to meet the requirement of hydrogen energy storage in advanceThen remains, i.e.Then ifThe dispatching requirement of the superior power grid can not be met or can just be met, therefore, the wind power is used for the local load and the hydrogen energy storage and then is completely merged into the superior power grid,the grid merging amount of other wind power plants is increased by the upper-level power grid through regulating instructions, and power shortage caused by the fact that the actual wind power output of the wind power plant of the type does not reach the dispatching requirement of the upper-level power grid is made up;
5. in the wind farm regulation mode represented by the type e, whenTime, hydrogen energy storage equivalent SOCeNot equal to hydrogen energy storage equivalentActual output of wind power plant meets hydrogen energy storage requirementThen remains, i.e.If it isIf the requirements of the upper-level power grid dispatching plan are exceeded, the wind power is used for local load and hydrogen energy storage and abandoned wind after meeting the requirements of the upper-level power grid dispatching,
6. in the wind farm regulation mode represented by the type f, whenTime, hydrogen energy storage equivalent SOCfNot equal to hydrogen energy storage equivalentThe actual output of the wind farm fails to meet or just meets the hydrogen storage, i.e.Therefore, the wind power is completely used for storing the hydrogen energy after meeting the local load,and the upper-level power grid dispatching improves the grid-connection quantity of other wind power plants by regulating the instruction, and makes up for the power shortage caused by the fact that the wind power plant f does not meet the dispatching requirement of the upper-level power grid.
Further, based on the regulation and control mode of the 6 types of typical wind power plants, an "equivalent" deployment formula is as follows:
(1) the actual total output of the wind power cluster is equal to the sum of the total power of the wind power grid, the total power of the hydrogen energy storage and the wind abandoning power:
(2) the total power of the wind power integration is equal to the local total load:
(3) the dispatching of the upper-level power grid is realized, the total power lack of local loads in the cluster is equal to the total power of wind power plants merged into the upper-level power grid in the cluster:
wherein,
equivalent SOCmaxAnd is
Equivalent SOCmaxAnd is
Non-equivalent SOCmaxAnd is
Non-equivalent SOCmaxAnd is
The upper-level power grid dispatching macroscopically regulates and controls the grid-connected power of each wind power plant according to a principle of 'homodyne equivalence', and combines the consumption of hydrogen energy storage of local wind power plants, so that the defects of difficulty in grid-connection of wind power of a single wind power plant, high wind abandoning rate and the like are overcome, and powerful technical support is provided for distributed development of wind power.
Claims (4)
1. A wind-hydrogen energy storage coupling system control method for a distributed access wind power plant is characterized in that the wind-hydrogen energy storage coupling system control method is based on a difference value between actual output of the wind power plant and local load, cooperates with a higher-level power grid dispatching plan, and controls power distribution of wind power integration and hydrogen energy storage in a wind-hydrogen energy storage coupling system by taking a hydrogen energy storage equivalent SOC (state of charge) as a judgment basis; monitoring actual output P of wind power plant in real-time online mannerwindLocal load PloadAnd the upper-level power grid dispatching plan PjhObtaining the actual output P of the wind power plantwindWith local load PloadComparing the result, and combining the comparison result with the hydrogen energy storage equivalent SOC state and the superior power grid dispatching plan PjhCarrying out secondary comparison; the system power comparator sends a control instruction to the power distribution actuator according to the two comparison results, the power distribution actuator controls the distribution of the wind power, meanwhile, the wind power grid-connected power is fed back to the upper-level power grid dispatching department, and the upper-level power grid dispatching department regulates and controls the wind power clusters according to the grid-connected data fed back by each wind power plant in a principle of 'homodyne equivalence';
the wind-hydrogen energy storage coupling system control method comprises the following steps:
firstly, a wind power Maximum Power Point Tracking (MPPT) method is adopted, and the actual wind power plant output P is obtained through real-time monitoringwind；
Secondly, the actual output P of the wind power plantwindWith local load PloadComparing to obtain the actual output P of the wind power plantwindWith local load PloadDifference value P ofre(ii) a And comparing the actual output P of the wind power plant by taking the hydrogen energy storage equivalent SOC as a criterion, namely taking the pressure state in a hydrogen storage tank in the hydrogen energy storage system as a criterionwindWith local load PloadDifference value P ofreAnd the upper-level power grid dispatching plan Pjh(ii) a Based on the two comparisons, 6 allocation orientations were obtained:
(1) when P is presentreWhen the content is less than or equal to 0: complete integration of wind power, Ps＝PwindActual output P of wind farmwindAll for local loads;
(2) when hydrogen energy storage equivalent SOC is equal to hydrogen energy storage equivalent SOCmaxAnd 0 is<Pre≤PjhThe method comprises the following steps: complete integration of wind power, Ps＝PwindActual output P of wind farmwindIn, PloadFor local load, actual output P of wind farmwindWith local load PloadDifference value P ofreThe system is used for being merged into an upper-level power grid;
(3) when hydrogen energy storage equivalent SOC is equal to hydrogen energy storage equivalent SOCmaxAnd 0 is<Pjh<PreThe method comprises the following steps: wind power is used for meeting the requirements of local load and wind abandon in the process of dispatching an upper-level power grid, wherein the wind power is leftPloadFor local loads, PjhUsed for being merged into a superior power grid and abandoning wind power Pcur＝|Pjh-(Pwind-Pload)|；
(4) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreCan satisfy hydrogen energy storage, i.e. (P)re-PH)>When 0, consuming hydrogen energy storage power PHThen, there is (P)re-PH)≤PjhActual output P of wind farmwindWith local load PloadDifference value P ofreSubtracting the consumed hydrogen energy storage power PHI.e. (P)re-PH) All incorporated in the upper grid, Ps＝Pwind-PH；
(5) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreCan satisfy hydrogen energy storage, i.e. (P)re-PH)>When 0, consuming hydrogen energy storage power PHThen, there is (P)re-PH)>PjhActual output P of wind farmwindWith local load PloadDifference value P ofreSubtracting the consumed hydrogen energy storage power PHI.e. (P)re-PH) Is used for meeting the requirements of the remaining abandoned wind after the dispatching of the local load and the superior power grids＝Pload+PjhPower of abandoned wind Pcur＝Pwind-(Pload+PH+Pjh)；
(6) When the hydrogen energy storage equivalent SOC is not equal to the hydrogen energy storage equivalent SOCmaxThe method comprises the following steps: if the actual output P of the wind power plantwindWith local load PloadDifference value P ofreFailing to meet or just meeting the hydrogen energy storage, i.e. (P)re-PH) When the power is less than or equal to 0, the hydrogen energy storage power PHActual force P of wind farmwindWith local load PloadDifference value P ofreEqual, PH＝PreActual output P of wind farmwindWith local load PloadDifference value P ofreAll for storingEnergy is saved;
wherein, PwindFor the actual output of the wind farm, PloadFor local load, PreIs the difference between the actual output of the wind farm and the local load, PHStoring energy for hydrogen, PjhFor the upper-level power grid scheduling plan, wind power integration power PsFor meeting the local load power + merging into the upper-level grid wind power, PcurEquivalent SOC of hydrogen energy storage for abandoning wind powermaxAnd is the upper limit of the hydrogen energy storage equivalent SOC.
2. The method for controlling the wind-hydrogen energy storage coupling system of the distributed access wind power plant according to claim 1, characterized in that for a single wind power plant, the real-time output of each single wind power plant under an ideal condition must meet or exceed the sum of the local load demand, the local hydrogen energy storage demand and the superior power grid dispatching plan, so that the actual output of the wind power plant can ensure the normal operation of the local load and meet the operation of the local hydrogen energy storage system, and the superior power grid dispatching demand is met under the premise; for a cluster consisting of multiple wind power plants, the total wind power output of the cluster under an ideal condition must meet or exceed the total load demand of the cluster, hydrogen energy storage is preferentially carried out under the condition, and wind is abandoned for stopping the power plant urgently.
3. The control method for the wind-hydrogen energy storage coupling system of the distributed access wind farm according to claim 1, characterized in that the principle of "coherent equivalence" is as follows: the 'homodyne' refers to that a superior power grid dispatching department gives targeted instructions to all wind power plants in a unified way from the whole; the equivalence represents that the cluster total dynamics are equal, the higher-level power grid dispatching sends out instructions according to the capacity of each wind power plant, and the surplus part of the output of the wind power cluster is converted into hydrogen energy to be stored on the premise of meeting the overall total load requirement of the system.
4. The wind-hydrogen energy storage coupling system control method for the distributed access wind power plant according to claim 1, wherein the hydrogen energy storage equivalent SOC state is a hydrogen storage and energy storage equivalent SOC stateResidual pressure p after the tank has been used for a period of time or left unused for a long period of timevreAnd its pressure p when completely filled with gascapThe ratio of (a) to (b).
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