CN113162065A - Power grid frequency modulation method and system based on cooperative coordination between production loads - Google Patents
Power grid frequency modulation method and system based on cooperative coordination between production loads Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 130
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 130
- 230000001105 regulatory effect Effects 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 230000006641 stabilisation Effects 0.000 claims abstract description 6
- 238000011105 stabilization Methods 0.000 claims abstract description 6
- 230000009466 transformation Effects 0.000 claims description 26
- 230000003068 static effect Effects 0.000 claims description 22
- 238000010891 electric arc Methods 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 10
- 230000002452 interceptive effect Effects 0.000 abstract description 4
- 230000033228 biological regulation Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention provides a power grid frequency modulation method and system based on cooperative matching among production loads, which belong to the technical field of power grid system frequency modulation. The method respectively calculates the frequency modulation capacity of the electrolytic aluminum and the submerged arc furnace, and calculates the power to be regulated of the electrolytic aluminum and the submerged arc furnace respectively by taking the frequency modulation capacity ratio as a distribution principle, thereby realizing the cooperative stabilization of power grid power fluctuation, and the electrolytic aluminum and the submerged arc furnace cooperatively participate in power grid interactive response, increasing the adjustable capacity of a load side, and simultaneously reducing the output pressure of a generator side; the problem of limited frequency modulation capacity when electrolytic aluminum or a submerged arc furnace independently participates in power grid demand side response is solved, and the power fluctuation of a power grid is stabilized by the cooperation of the electrolytic aluminum and the submerged arc furnace.
Description
Technical Field
The invention relates to the technical field of power grid system frequency modulation, in particular to a power grid frequency modulation method and system based on the cooperative coordination between two production loads of electrolytic aluminum and a submerged arc furnace.
Background
With the expansion of the scale of the power grid, the access of high-proportion new energy and the increasing load, the problems of peak load regulation, frequency modulation and frequency stability of the power grid become more and more severe. The high-energy-consumption industrial loads such as electrolysis loads and arc loads have the characteristics of high power consumption and stable power, have huge power regulation and control potential, and the power regulation of the industrial loads in a short time does not cause serious influence on industrial production, so that the high-energy-consumption industrial loads with large capacity can participate in peak regulation and frequency modulation of a power grid.
Conventionally, electrolytic aluminum and a submerged arc furnace respectively have certain capacity of participating in frequency modulation on a demand side, but the respective frequency modulation capacity is limited, and for large disturbance of a power system, the system is stabilized by increasing the output of a generator or the output of stored energy.
Disclosure of Invention
The invention aims to provide a power grid frequency modulation method and a power grid frequency modulation system based on the cooperation of electrolytic aluminum and a submerged arc furnace, which can increase the adjustable capacity of a load side and reduce the side pressure of a generator, so as to solve at least one technical problem in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a power grid frequency modulation method based on cooperative coordination between production loads, which comprises the following steps:
and calculating the frequency modulation capacity corresponding to the production load based on the production boundary constraint condition of the production load, calculating the power required to be adjusted by each production load according to the frequency modulation capacity ratio among the production loads, and performing power adjustment on each production load to realize the cooperative stabilization of power fluctuation of the power grid.
Preferably, the production load comprises electrolytic aluminium and a submerged arc furnace.
Preferably, the production boundary constraint conditions of the electrolytic aluminum comprise the transformation ratio of an on-load tap changer of the electrolytic aluminum and the voltage drop of a saturable reactor; the production boundary constraint conditions of the submerged arc furnace comprise a transformer adjustable range, an electric arc static resistance range, a power factor constraint and a minimum smelting power constraint for the submerged arc furnace.
Preferably, calculating the fm capacity of the electrolytic aluminum comprises: and determining the range of the direct-current side voltage of the electrolytic aluminum by combining the transformation ratio of the on-load tap changer and the voltage drop of the saturable reactor, and determining the adjustable range of the power of the electrolytic aluminum, namely the frequency modulation capacity of the electrolytic aluminum by combining the load power characteristic of the electrolytic aluminum.
Preferably, the calculating the frequency modulation capacity of the submerged arc furnace comprises: according to the adjustable range of the transformer for the submerged arc furnace and the static resistance range of the electric arc, the voltage range of the low-voltage side of the transformer for the submerged arc furnace is determined, the minimum smelting power constraint and the active and reactive power characteristics of the submerged arc furnace are met in each smelting stage, the variation range of the active power and the reactive power of the submerged arc furnace is determined, and the adjustable capacity of the active power of the submerged arc furnace is obtained.
Preferably, the power required to be regulated by the electrolytic aluminum and the submerged arc furnace respectively is determined according to the frequency modulation capacity ratio of the electrolytic aluminum and the submerged arc furnace and by combining the active power shortage of a power grid.
Preferably, the values of the on-load tap changer transformation ratio and the saturable reactor voltage drop corresponding to the power to be regulated of the electrolytic aluminum are issued to the electrolytic aluminum load, and the active power of the electrolytic aluminum is regulated; and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace to finally realize the purpose of stabilizing the power shortage of the power grid based on the cooperative coordination of the electrolytic aluminum and the submerged arc furnace.
In a second aspect, the present invention provides a grid frequency modulation system based on coordination between production loads, which utilizes the grid frequency modulation method based on coordination between production loads as described above, and includes:
the first calculation module is used for calculating the first frequency modulation capacity of the first production load;
the second calculation module is used for calculating a second frequency modulation capacity of a second production load;
the distribution module is used for determining the power to be regulated of the first production load and the power to be regulated of the second production load according to the first frequency modulation capacity and the second frequency modulation capacity;
the first adjusting module is used for adjusting the active power of the first production load according to the power required to be adjusted of the first production load;
and the second adjusting module is used for adjusting the active power of the second production load according to the power required to be adjusted of the second production load.
Preferably, the first production load is electrolytic aluminum, and the second production load is a submerged arc furnace.
Preferably, the first adjusting module is configured to: the on-load tap changer transformation ratio corresponding to the power to be regulated of the electrolytic aluminum and the voltage drop value of the saturable reactor are issued to the electrolytic aluminum load, and the active power of the electrolytic aluminum is regulated; the second adjustment module is configured to: and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace.
The invention has the beneficial effects that: analyzing production boundary constraint conditions of the electrolytic aluminum and the submerged arc furnace, respectively calculating frequency modulation capacities of the electrolytic aluminum and the submerged arc furnace based on the production boundary conditions, and solving the power to be regulated of the electrolytic aluminum and the submerged arc furnace respectively by taking the frequency modulation capacity ratio of the electrolytic aluminum and the submerged arc furnace as a distribution principle, so as to realize the cooperative stabilization of power fluctuation of a power grid, and the electrolytic aluminum and the submerged arc furnace cooperatively participate in power grid interactive response, thereby greatly increasing the adjustable capacity of a load side and simultaneously reducing the output pressure of a generator side; the problem of limited frequency modulation capacity when electrolytic aluminum or a submerged arc furnace independently participates in power grid demand side response is solved, and the power fluctuation of a power grid is stabilized by the cooperation of the electrolytic aluminum and the submerged arc furnace.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced 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 creative efforts.
Fig. 1 is a functional schematic block diagram of a power grid frequency modulation system based on cooperation between production loads according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a power grid frequency modulation method based on cooperation between production loads according to embodiment 2 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.
It should be understood by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements shown in the drawings are not necessarily required to practice the invention.
Example 1
As shown in fig. 1, in order to solve the problem that the frequency modulation capacity is limited when the electrolytic aluminum or the submerged arc furnace participates in the response of the power grid demand side alone, embodiment 1 provides a power grid frequency modulation system based on the cooperative coordination between production loads, so that the frequency modulation capacity evaluation based on the cooperative coordination between the electrolytic aluminum and the submerged arc furnace is realized, and the power fluctuation of the power grid is stabilized through the cooperative coordination between the electrolytic aluminum and the submerged arc furnace.
In this embodiment 1, a power grid frequency modulation system based on cooperation between production loads includes:
the first calculation module is used for calculating the first frequency modulation capacity of the first production load;
the second calculation module is used for calculating a second frequency modulation capacity of a second production load;
the distribution module is used for determining the power to be regulated of the first production load and the power to be regulated of the second production load according to the first frequency modulation capacity and the second frequency modulation capacity;
the first adjusting module is used for adjusting the active power of the first production load according to the power required to be adjusted of the first production load;
and the second adjusting module is used for adjusting the active power of the second production load according to the power required to be adjusted of the second production load.
In this example 1, the first production load is electrolytic aluminum, and the second production load is a submerged arc furnace.
The first computing module is configured to: and determining the range of the direct-current side voltage of the electrolytic aluminum by combining the transformation ratio of the on-load tap changer and the voltage drop of the saturable reactor, and determining the adjustable range of the power of the electrolytic aluminum, namely the frequency modulation capacity of the electrolytic aluminum by combining the load power characteristic of the electrolytic aluminum.
The second computing module is configured to: according to the adjustable range of the transformer for the submerged arc furnace and the static resistance range of the electric arc, the voltage range of the low-voltage side of the transformer for the submerged arc furnace is determined, the minimum smelting power constraint and the active and reactive power characteristics of the submerged arc furnace are met in each smelting stage, the variation range of the active power and the reactive power of the submerged arc furnace is determined, and the adjustable capacity of the active power of the submerged arc furnace is obtained.
The assignment module is configured to: and determining the power of the electrolytic aluminum and the submerged arc furnace which need to be adjusted respectively according to the frequency modulation capacity proportion of the electrolytic aluminum and the submerged arc furnace and by combining the active power shortage of the power grid.
In this embodiment 1, the first adjusting module is configured to: the on-load tap changer transformation ratio corresponding to the power to be regulated of the electrolytic aluminum and the voltage drop value of the saturable reactor are issued to the electrolytic aluminum load, and the active power of the electrolytic aluminum is regulated; the second adjustment module is configured to: and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace.
As shown in fig. 1, in this embodiment 1, the system further includes a first obtaining module, configured to obtain a production boundary constraint condition of the electrolytic aluminum, and send the production boundary constraint condition to the first calculating module, where the production boundary constraint condition of the electrolytic aluminum includes a ratio range of the on-load tap-changing transformer and a voltage drop adjustment range of the saturable reactor.
The system also comprises a second acquisition module which is used for acquiring the production boundary constraint conditions of the submerged arc furnace and sending the constraint conditions to the second calculation module, wherein the production boundary constraint conditions of the submerged arc furnace comprise the transformer transformation ratio range, the electric arc static resistance constraint, the electric arc power factor constraint and the minimum smelting power constraint of each stage for the submerged arc furnace.
In this embodiment 1, a power grid frequency modulation method based on cooperation between production loads is implemented by using the system described above, and the method includes:
and calculating the frequency modulation capacity corresponding to the production load based on the production boundary constraint condition of the production load, calculating the power required to be adjusted by each production load according to the frequency modulation capacity ratio among the production loads, and performing power adjustment on each production load to realize the cooperative stabilization of power fluctuation of the power grid.
Calculating the FM capacity of the electrolytic aluminum comprises: and determining the range of the direct-current side voltage of the electrolytic aluminum by combining the transformation ratio of the on-load tap changer and the voltage drop of the saturable reactor, and determining the adjustable range of the power of the electrolytic aluminum, namely the frequency modulation capacity of the electrolytic aluminum by combining the load power characteristic of the electrolytic aluminum.
The step of calculating the frequency modulation capacity of the submerged arc furnace comprises the following steps: according to the adjustable range of the transformer for the submerged arc furnace and the static resistance range of the electric arc, the voltage range of the low-voltage side of the transformer for the submerged arc furnace is determined, the minimum smelting power constraint and the active and reactive power characteristics of the submerged arc furnace are met in each smelting stage, the variation range of the active power and the reactive power of the submerged arc furnace is determined, and the adjustable capacity of the active power of the submerged arc furnace is obtained.
And determining the power of the electrolytic aluminum and the submerged arc furnace which need to be adjusted respectively according to the frequency modulation capacity proportion of the electrolytic aluminum and the submerged arc furnace and by combining the active power shortage of the power grid.
The on-load tap changer transformation ratio corresponding to the power to be regulated of the electrolytic aluminum and the voltage drop value of the saturable reactor are issued to the electrolytic aluminum load, and the active power of the electrolytic aluminum is regulated; and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace to finally realize the purpose of stabilizing the power shortage of the power grid based on the cooperative coordination of the electrolytic aluminum and the submerged arc furnace.
In summary, in this embodiment 1, first, production boundary constraint conditions of the electrolytic aluminum and the submerged arc furnace are analyzed, then frequency modulation capacities of the electrolytic aluminum and the submerged arc furnace are respectively calculated based on the production boundary conditions, and power to be adjusted of the electrolytic aluminum and the submerged arc furnace is obtained by taking a frequency modulation capacity ratio of the electrolytic aluminum and the submerged arc furnace as a distribution principle, so as to achieve cooperative stabilization of power fluctuation of a power grid, and the electrolytic aluminum and the submerged arc furnace cooperatively participate in power grid interactive response, thereby greatly increasing adjustable capacity on a load side and reducing output pressure on a generator side.
Example 2
As shown in fig. 2, this embodiment 2 provides a grid power frequency modulation method based on the cooperative coordination between two production loads of electrolytic aluminum and a submerged arc furnace, and mainly achieves the cooperative coordination between the electrolytic aluminum and the submerged arc furnace to stabilize the power fluctuation of the grid. The method comprises the steps of firstly analyzing production constraint boundary conditions of the electrolytic aluminum, including conditions such as the regulating range of an on-load tap changer, the regulating range of a saturable reactor and the temperature of the electrolytic aluminum, and determining the theoretical adjustable capacity of the electrolytic aluminum. Secondly, analyzing production constraint boundary conditions of the submerged arc furnace, including conditions of a transformer adjustable range, an arc static resistance range, power factor constraint, minimum smelting power constraint and the like, and determining the theoretical adjustable capacity of the submerged arc furnace. And finally, normalizing the power of the electrolytic aluminum and the submerged arc furnace, calculating the frequency modulation capacity ratio of the electrolytic aluminum and the submerged arc furnace, and calculating the power of the electrolytic aluminum and the submerged arc furnace which are respectively required to be adjusted under the power disturbance by taking the frequency modulation capacity ratio as a distribution principle.
In this embodiment 2, a grid power frequency modulation method based on cooperation between two production loads of electrolytic aluminum and a submerged arc furnace includes the following specific steps:
(1) determining the tunable capacity of an electrolytic aluminum load
The electrolytic aluminum load power is adjusted mainly by adjusting the transformation ratio k of the on-load tap changing transformer and the voltage drop V of the saturable reactorsrBy determining k and VsrTo determine the DC side voltage V of the electrolytic aluminumdAnd finally, determining the adjustable range of the power according to the load power characteristic of the electrolytic aluminum.
The transformation ratio k of the on-load tap changer has m levels, namely the conditions are met:
k＝{k1,k2,...,km} (1)
the voltage drop adjustable range of the electrolytic aluminum load saturable reactor is supposed to meet the following requirements:
Vsrmin≤Vsr≤Vsrmax (2)
direct current side voltage V of electrolytic aluminumdThe expression is as follows:
wherein, VAHIs the high-voltage side voltage of the on-load transformer.
Direct current side voltage V of electrolytic aluminumdThe variation range of (b) satisfies:
Vdmin≤Vd≤Vdmax (4)
wherein,
the expression of the active power of the electrolytic aluminum is as follows:
wherein, PALActive power for electrolytic aluminium load, VdThe voltage on the direct current side of the electrolytic aluminum is E, the equivalent electromotive force of the electrolytic aluminum load electrolytic cell is E, and the equivalent resistance of the electrolytic aluminum load electrolytic cell is R.
Determined DC side voltage VdThe active power of the electrolytic aluminum has a variation range as follows:
PALmin≤PAL≤PALmax (8)
wherein,
the electrolytic aluminum load adjustable capacity is determined as follows:
ΔPAL＝PALmax-PALmin (11)
(2) ore furnace adjustable capacity determination
The power regulation mode of the submerged arc furnace mainly comprises two modes of fixed impedance voltage regulation and fixed voltage impedance regulation, and the impedance-voltage cooperative regulation method is obtained by combining the two regulation modes.
Active and reactive power characteristics of the submerged arc furnace:
wherein, PSAFIs active power of ore furnace, QSAFIs the reactive power of ore furnace, VLIs provided withLow-voltage side voltage, R, of voltage-regulating transformerlineAnd XlineFor network resistance and reactance, RarcAnd XarcIs the static resistance and static reactance of the arc, wherein the arc static resistance RarcAnd a static reactance XarcThe relationship between them can be fitted from actual production data.
For the special transformer of the submerged arc furnace, the voltage at the high-voltage side is VAHThe low-voltage side voltage is VL，kSAFFor the transformer transformation ratio, assuming that the static impedance of the electric arc is unchanged, and the voltage of the low-voltage side of the special transformer for the submerged arc furnace meets the following requirements:
VL＝VAH/kSAF (14)
wherein, assuming that the adjustable stage number of the transformer transformation ratio is n, the selectable range of the transformer transformation ratio is as follows:
kSAF∈{kSAF1,kSAF2,kSAF3,…,kSAFn} (15)
the arc static resistance variable range is:
Rarcmin≤Rarc≤Rarcmax (16)
the arc power factor variable range is:
i.e. the arc resistance and the arc reactance satisfy the relationship:
Xarcmin≤Xarc≤Xarcmax (18)
wherein,
and then considering that each smelting stage meets the minimum active power limit:
PSAF,t≥Pt,min (21)
the active power and the reactive power of the submerged arc furnace have the following variation ranges:
PSAFmin≤PSAF≤PSAFmax (22)
QSAFmin≤QSAF≤QSAFmax (23)
wherein,
therefore, the active power adjustable capacity of the submerged arc furnace is as follows:
ΔPSAF＝PSAFmax-PSAFmin (28)
(3) frequency modulation capacity evaluation method based on synergistic cooperation of electrolytic aluminum and submerged arc furnace
And supposing that the active power shortage of the power grid is delta P, determining the power which should be adjusted by the electrolytic aluminum and the submerged arc furnace respectively according to the frequency modulation capacity proportion of the electrolytic aluminum and the submerged arc furnace so as to realize the cooperative coordination of the electrolytic aluminum and the submerged arc furnace to stabilize the power shortage of the power grid.
Power required to regulate the electrolytic aluminum load:
power required to be adjusted by the submerged arc furnace:
determination of the load adjustment Δ P for electrolytic aluminumAL,tTime on-load tap changing transformer transformation ratio k and saturable reactor voltage drop VsrThe value of (2) is sent to the electrolytic aluminum load, so that the active power of the electrolytic aluminum can be adjusted. Determining submerged arc furnace load adjustment delta PSAF,tTransformation ratio k of time transformerSAFAnd the values of the arc static resistance and the reactance are issued to the load of the submerged arc furnace, so that the active power of the submerged arc furnace can be adjusted, and finally, the power shortage of the power grid can be stabilized based on the cooperative coordination of the electrolytic aluminum and the submerged arc furnace.
In conclusion, in this embodiment 2, a method of cooperatively matching two industrial loads of the electrolytic aluminum furnace and the submerged arc furnace with each other to participate in the frequency modulation response of the power grid is considered, and the power shortage of the power grid is eliminated by adjusting the active power of the electrolytic aluminum furnace and the submerged arc furnace. The electrolytic aluminum and the submerged arc furnace are used as smelting loads with high energy consumption and high-temperature production, and active power of the electrolytic aluminum and the submerged arc furnace is reduced for a short time within a corresponding production constraint range without influencing production, so that the method has great load power regulation potential, the adjustable capacity of the electrolytic aluminum and the submerged arc furnace is analyzed, a frequency modulation capacity evaluation method with the cooperation of the electrolytic aluminum and the submerged arc furnace is provided, and the power which needs to be adjusted respectively by the electrolytic aluminum and the submerged arc furnace under the condition of the same power grid power shortage can be determined to eliminate the power grid power shortage.
Example 3
This embodiment 3 provides a power grid frequency modulation method, which is implemented based on the mutual cooperation of two industrial loads, namely electrolytic aluminum and a submerged arc furnace. Aiming at large disturbance of a power grid, an industrial load side obtains a demand side response power regulating quantity instruction from a power grid dispatching position, supposing that active power required to be regulated by the industrial load in cooperation with the power grid is delta P, then respectively determining the current working conditions of the electrolytic aluminum furnace and the submerged arc furnace and the adjustable capacity under the production boundary constraint condition, calculating the active power required to be regulated by the electrolytic aluminum furnace and the submerged arc furnace respectively by taking the adjustable capacity ratio as a distribution principle, and simultaneously issuing the regulating instruction to power regulating devices such as a transformer, a saturable reactor and the like.
Step 1: and determining the power delta P required by the industrial load to be matched with the power grid regulation, wherein the instruction is obtained from a power grid dispatching place.
Step 2: determining the frequency modulation capacity of the electrolytic aluminum in the current production state. Specifically, the following formulae (1) to (11) can be referred to.
And step 3: and determining the frequency modulation capacity of the submerged arc furnace in the current production state. Specifically, the following formulae (12) to (27) can be referred to.
And 4, step 4: and (3) a collaborative frequency modulation capacity evaluation method.
Power required to regulate the electrolytic aluminum load:
power required to be adjusted by the submerged arc furnace:
determination of the load adjustment Δ P for electrolytic aluminumAL,tTime on-load tap changing transformer transformation ratio k and saturable reactor voltage drop VsrThe value of (2) is sent to the electrolytic aluminum load, so that the active power of the electrolytic aluminum can be adjusted. Determining submerged arc furnace load adjustment delta PSAF,tTransformation ratio k of time transformerSAFAnd the values of the arc static resistance and the reactance are issued to the load of the submerged arc furnace, so that the active power of the submerged arc furnace can be adjusted, and finally, the power shortage of the power grid can be stabilized based on the cooperative coordination of the electrolytic aluminum and the submerged arc furnace.
In summary, the method and the system for adjusting the power grid frequency based on the cooperative production load coordination in the embodiments of the present invention can realize that other various industrial loads such as electrolytic aluminum and submerged arc furnace collaboratively participate in the frequency modulation capacity evaluation of the power grid interactive response. The power grid frequency adjusting method based on the production load cooperative coordination determines the frequency modulation capacity of the electrolytic aluminum and the submerged arc furnace based on the actual production boundary constraint of the electrolytic aluminum and the submerged arc furnace in a certain production state, determines the power values required to be adjusted by the electrolytic aluminum and the submerged arc furnace under large disturbance by taking the frequency modulation capacity of the electrolytic aluminum and the submerged arc furnace as a distribution principle, can be popularized to other three or more industrial loads to cooperatively participate in power grid frequency modulation, and has important guiding significance for power grid demand side response.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to the specific embodiments shown in the drawings, it is not intended to limit the scope of the present disclosure, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive faculty based on the technical solutions disclosed in the present disclosure.
Claims (10)
1. A power grid frequency modulation method based on cooperation between production loads is characterized by comprising the following steps:
and calculating the frequency modulation capacity corresponding to the production load based on the production boundary constraint condition of the production load, calculating the power required to be adjusted by each production load according to the frequency modulation capacity ratio among the production loads, and performing power adjustment on each production load to realize the cooperative stabilization of power fluctuation of the power grid.
2. The grid frequency modulation method based on coordination between production loads as claimed in claim 1, wherein said production loads comprise electrolytic aluminum and submerged arc furnace.
3. The grid frequency modulation method based on the cooperation between production loads according to claim 2, wherein the production boundary constraint conditions of the electrolytic aluminum comprise the transformation ratio of an on-load tap changer of the electrolytic aluminum and the voltage drop of a saturable reactor; the production boundary constraint conditions of the submerged arc furnace comprise a transformer adjustable range, an electric arc static resistance range, a power factor constraint and a minimum smelting power constraint for the submerged arc furnace.
4. The grid frequency modulation method based on coordination between production loads according to claim 3, wherein calculating the frequency modulation capacity of the electrolytic aluminum comprises: and determining the range of the direct-current side voltage of the electrolytic aluminum by combining the transformation ratio of the on-load tap changer and the voltage drop of the saturable reactor, and determining the adjustable range of the power of the electrolytic aluminum, namely the frequency modulation capacity of the electrolytic aluminum by combining the load power characteristic of the electrolytic aluminum.
5. The grid frequency modulation method based on coordination between production loads as claimed in claim 3, wherein calculating the frequency modulation capacity of the submerged arc furnace comprises: according to the adjustable range of the transformer for the submerged arc furnace and the static resistance range of the electric arc, the voltage range of the low-voltage side of the transformer for the submerged arc furnace is determined, the minimum smelting power constraint and the active and reactive power characteristics of the submerged arc furnace are met in each smelting stage, the variation range of the active power and the reactive power of the submerged arc furnace is determined, and the adjustable capacity of the active power of the submerged arc furnace is obtained.
6. The method of claim 2, wherein the power of the electrolytic aluminum and the submerged arc furnace to be adjusted is determined according to the ratio of the capacity of the electrolytic aluminum to the capacity of the submerged arc furnace to be adjusted, in combination with the power shortage of the active power of the power grid.
7. The power grid frequency modulation method based on the cooperation between the production loads according to claim 6, wherein the values of the on-load tap changer transformation ratio and the saturable reactor voltage drop corresponding to the power to be adjusted of the electrolytic aluminum are issued to the electrolytic aluminum load to adjust the active power of the electrolytic aluminum; and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace to finally realize the purpose of stabilizing the power shortage of the power grid based on the cooperative coordination of the electrolytic aluminum and the submerged arc furnace.
8. A grid frequency modulation system based on cooperation between production loads by using the grid frequency modulation method based on cooperation between production loads according to any one of claims 1 to 7, comprising:
the first calculation module is used for calculating the first frequency modulation capacity of the first production load;
the second calculation module is used for calculating a second frequency modulation capacity of a second production load;
the distribution module is used for determining the power to be regulated of the first production load and the power to be regulated of the second production load according to the first frequency modulation capacity and the second frequency modulation capacity;
the first adjusting module is used for adjusting the active power of the first production load according to the power required to be adjusted of the first production load;
and the second adjusting module is used for adjusting the active power of the second production load according to the power required to be adjusted of the second production load.
9. The grid frequency modulation system according to claim 8, wherein the first production load is electrolytic aluminum and the second production load is a submerged arc furnace.
10. The system according to claim 9, wherein the first adjusting module is configured to: the on-load tap changer transformation ratio corresponding to the power to be regulated of the electrolytic aluminum and the voltage drop value of the saturable reactor are issued to the electrolytic aluminum load, and the active power of the electrolytic aluminum is regulated; the second adjustment module is configured to: and transmitting the transformer transformation ratio corresponding to the power to be regulated of the submerged arc furnace and the values of the static resistance and the reactance of the electric arc to the submerged arc furnace load, and regulating the active power of the submerged arc furnace.
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