CN117977622A - Electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method and system - Google Patents
Electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for assisting in controlling the frequency of an electrolytic aluminum load participating in an asynchronous power grid, wherein the method comprises the steps of obtaining historical operation parameters of an electric power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining a transient maximum frequency deviation range of the asynchronous power grid when the electric power system of the asynchronous power grid is in power shortage; acquiring a transient maximum frequency offset of a real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system; if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model; and according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid. The transient maximum frequency offset of the system is ensured to be in an allowable range, and the accurate control of the system frequency is realized.
Description
Technical Field
The invention relates to the technical field of electrolytic aluminum load participation asynchronous power grid frequency auxiliary control, in particular to a method and a system for electrolytic aluminum load participation asynchronous power grid frequency auxiliary control.
Background
In order to cope with the global warming and environmental pollution problems, the new energy source represented by photovoltaic and wind power is rapidly developed in the global scope. With the continuous increase of the permeability of the new energy, the strong randomness and fluctuation of the output of the new energy inevitably leads to the fluctuation of the system frequency, and in extreme cases, the frequency stability of the power system can be ensured by adopting measures of discarding the new energy. With the continuous increase of the new energy duty ratio, after asynchronous networking, the problem of frequency stabilization of the power grid at the transmitting end and the prominence thereof, and serious faults such as high-capacity direct current blocking and the like can cause the frequency of the power grid at the transmitting end to be greatly increased, so that the high-frequency switching device is caused to frequently act, and the frequency instability of the power grid is further caused by improper action.
In a power grid system with electrolytic aluminum load access, the electrolytic aluminum load cannot realize accurate control of isolated grid frequency, when the system is in high power shortage, the transient frequency of the system can be rapidly reduced, and in order to ensure that the maximum transient frequency deviation of the system is in an allowable range, a method for assisting in accurate control of the system frequency by the electrolytic aluminum load is required to be designed.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides a method and a system for assisting in controlling the frequency of an electrolytic aluminum load participating in an asynchronous power grid, which can solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme that the electrolytic aluminum load participates in the frequency auxiliary control method of the asynchronous power grid, which comprises the following steps:
acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, and determining a transient maximum frequency offset range of the asynchronous power grid when the power shortage of the asynchronous power grid power system occurs;
Acquiring a transient maximum frequency offset of a real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system;
if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model;
And according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the method comprises the steps of obtaining historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, determining the transient maximum frequency offset range of the asynchronous power grid when the asynchronous power grid power system has power shortage,
When the system has power shortage, the transient frequency of the system is reduced, frequency deviation is generated, and a saturation reactor of electrolytic aluminum is introduced, so that the active power adjustment quantity and response speed of the electrolytic aluminum can automatically follow the frequency change of the system;
the relationship between the amount of change in the voltage drop of the saturable reactor and the system frequency deviation is as follows:
ΔVyj＝εk·Δfbias
Wherein DeltaV yj is the variation of the voltage drop of the saturation reactor, epsilon k is the frequency feedback control coefficient of each electrolytic aluminum load, and Deltaf bias is the system frequency deviation value;
And when the offset is not in the transient maximum frequency offset range of the asynchronous power grid power system, replacing other auxiliary control modes.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
The relationship between the transient frequency maximum deviation and the active power absence of the system is as follows:
Wherein Deltaω max represents the maximum deviation of transient frequency of the system, deltaP represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the power system, K m represents the mechanical power gain, alpha, Omega n、tz is a function of the damping coefficient of the power system.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
Wherein D max represents the power system damping coefficient, D state represents the system inherent damping coefficient, D i represents the damping coefficient of the ith electrolytic aluminum load, and n represents the total number of electrolytic aluminum loads connected.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
Wherein H represents an inertia time constant of the system, F H represents a mechanical power percentage, T R represents a reheating time constant, deltaP represents a system active power deficiency, R represents a droop coefficient of a speed regulator, D max represents a damping coefficient of an electric power system, K m represents a mechanical power gain, alpha,Omega n、tz is a function of the damping coefficient of the power system.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the preset system frequency response model includes,
Wherein, H(s) represents a transfer function of a system frequency response model, H represents an inertia time constant of the system, deltaP G represents primary frequency modulation total power of the generator, deltaP ALΣ represents total adjustment quantity of active power of the electrolytic aluminum corresponding to a system frequency control target in which all electrolytic aluminum loads participate.
As a preferable scheme of the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method, the invention comprises the following steps: the preset system frequency response model further comprises,
Wherein Δp G represents the primary frequency modulation total power of the generator, Δp ALΣ represents the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target in which all electrolytic aluminum loads participate, D i represents the damping coefficient of the ith electrolytic aluminum load, n represents the total number of the electrolytic aluminum loads connected in, Δp represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the electric power system, and K m represents the mechanical power gain.
An electrolytic aluminum load participation asynchronous power grid frequency auxiliary control system is characterized in that: comprises a range acquisition module, a judgment module, a calculation module and a control and regulation module,
The range acquisition module is used for acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load and determining a transient maximum frequency offset range of the asynchronous power grid when the asynchronous power grid power system is in power shortage;
The judging module is used for acquiring the transient maximum frequency offset of the real-time asynchronous power grid power system and judging whether the offset is in the transient maximum frequency offset range of the asynchronous power grid power system;
The calculation module is used for calculating the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target by combining a preset system frequency response model if the total adjustment quantity is within the range;
And the control and regulation module is used for completing the participation of electrolytic aluminum load in the frequency auxiliary control and regulation of the power system of the asynchronous power grid according to the total regulation quantity of the electrolytic aluminum active power corresponding to the system frequency control target.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method as described above when executing the computer program.
A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method as described above.
The invention has the beneficial effects that: the invention provides a method and a system for assisting in controlling the frequency of an electrolytic aluminum load participating in an asynchronous power grid, which are used for acquiring historical operation parameters of an electric power system of the asynchronous power grid connected with the electrolytic aluminum load and determining a transient maximum frequency deviation range of the asynchronous power grid when the electric power system of the asynchronous power grid is in power shortage; acquiring a transient maximum frequency offset of a real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system; if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model; and according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid. The transient maximum frequency offset of the system is ensured to be in an allowable range, and the accurate control of the system frequency is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a flow chart of a method and system for controlling the participation of electrolytic aluminum load in the frequency assistance of an asynchronous power grid according to one embodiment of the present invention;
fig. 2 is an internal structural diagram of a computer device for participating in an asynchronous power grid frequency auxiliary control method and system for electrolytic aluminum load according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1-2, a first embodiment of the present invention provides a method and a system for assisting control of electrolytic aluminum load participating in asynchronous power grid frequency, comprising:
acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, and determining a transient maximum frequency offset range of the asynchronous power grid when the power shortage of the asynchronous power grid power system occurs;
The method comprises the steps that historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load are obtained, and when the asynchronous power grid power system is in power shortage, the transient maximum frequency deviation range of the asynchronous power grid is determined, wherein when the power shortage occurs in the asynchronous power grid power system, the transient frequency of the system is reduced, frequency deviation is generated, a saturation reactor of electrolytic aluminum is introduced, so that the active power adjustment quantity and response speed of the electrolytic aluminum can automatically follow the frequency change of the system;
It should be noted that the relationship between the amount of change in the voltage drop of the saturable reactor and the deviation of the system frequency is as follows:
ΔVyj＝εk·Δfbias
Wherein DeltaV yj is the variation of the voltage drop of the saturation reactor, epsilon k is the frequency feedback control coefficient of each electrolytic aluminum load, and Deltaf bias is the system frequency deviation value;
furthermore, when the offset is not within the transient maximum frequency offset range of the asynchronous power grid power system, other auxiliary control modes are replaced.
Further, acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, and determining a transient maximum frequency deviation range of the asynchronous power grid when the asynchronous power grid power system has power shortage further comprises the following relationship between the transient maximum frequency deviation and active power shortage of the system:
Wherein Deltaω max represents the maximum deviation of transient frequency of the system, deltaP represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the power system, K m represents the mechanical power gain, alpha, Omega n、tz is a function of the damping coefficient of the power system.
Furthermore, obtaining historical operation parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, determining the transient maximum frequency offset range of the asynchronous power grid when the power system of the asynchronous power grid is in power shortage further comprises,
Wherein D max represents the power system damping coefficient, D state represents the system inherent damping coefficient, D i represents the damping coefficient of the ith electrolytic aluminum load, and n represents the total number of electrolytic aluminum loads connected.
Furthermore, obtaining historical operation parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, determining the transient maximum frequency offset range of the asynchronous power grid when the power system of the asynchronous power grid is in power shortage further comprises,
Wherein H represents an inertia time constant of the system, F H represents a mechanical power percentage, T R represents a reheating time constant, deltaP represents a system active power deficiency, R represents a droop coefficient of a speed regulator, D max represents a damping coefficient of an electric power system, K m represents a mechanical power gain, alpha,Omega n、tz is a function of the damping coefficient of the power system.
Further, acquiring the transient maximum frequency offset of the real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system;
It should be noted that if the total adjustment amount of the active power of the electrolytic aluminum is within the range, the total adjustment amount of the active power of the electrolytic aluminum corresponding to the system frequency control target is calculated by combining with a preset system frequency response model;
wherein the preset system frequency response model comprises,
Wherein, H(s) represents a transfer function of a system frequency response model, H represents an inertia time constant of the system, deltaP G represents primary frequency modulation total power of the generator, deltaP ALΣ represents total adjustment quantity of active power of the electrolytic aluminum corresponding to a system frequency control target in which all electrolytic aluminum loads participate.
Further, the preset system frequency response model further comprises,
Wherein Δp G represents the primary frequency modulation total power of the generator, Δp ALΣ represents the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target in which all electrolytic aluminum loads participate, D i represents the damping coefficient of the ith electrolytic aluminum load, n represents the total number of the electrolytic aluminum loads connected in, Δp represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the electric power system, and K m represents the mechanical power gain.
Furthermore, according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid is completed.
In summary, the invention provides a method for assisting in controlling the frequency of an electrolytic aluminum load participating in an asynchronous power grid, which comprises the steps of determining the transient maximum frequency deviation range of the asynchronous power grid when the power shortage occurs in the asynchronous power grid power system by acquiring historical operation parameters of the asynchronous power grid power system connected with the electrolytic aluminum load; acquiring the transient maximum frequency offset of the real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system; if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model; and then according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid. The transient maximum frequency offset of the system is ensured to be in an allowable range, and the accurate control of the system frequency is realized.
In one embodiment, the electrolytic aluminum load participation asynchronous power grid frequency auxiliary control system comprises a range acquisition module, a judgment module, a calculation module and a control and regulation module,
The range acquisition module is used for acquiring historical operation parameters of an asynchronous power grid power system connected with the electrolytic aluminum load and determining a transient maximum frequency offset range of the asynchronous power grid when the asynchronous power grid power system is in power shortage;
the judging module is used for acquiring the transient maximum frequency offset of the real-time asynchronous power grid power system and judging whether the offset is in the transient maximum frequency offset range of the asynchronous power grid power system;
The calculation module is used for calculating the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target by combining a preset system frequency response model if the total adjustment quantity is within the range;
And the control and regulation module is used for completing the participation of the electrolytic aluminum load in the frequency auxiliary control and regulation of the power system of the asynchronous power grid according to the total regulation quantity of the electrolytic aluminum active power corresponding to the system frequency control target.
The above unit modules may be embedded in hardware or independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above units.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 2. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program when executed by the processor is used for realizing an electrolytic aluminum load participating in an asynchronous power grid frequency auxiliary control method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, and determining a transient maximum frequency offset range of the asynchronous power grid when the power shortage of the asynchronous power grid power system occurs;
Acquiring a transient maximum frequency offset of a real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system;
if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model;
And according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid.
Example 2
Referring to fig. 1-2, for one embodiment of the present invention, a method and a system for assisting in controlling the frequency of an electrolytic aluminum load participating in an asynchronous power grid are provided, and in order to verify the beneficial effects of the present invention, scientific demonstration is performed through comparative experiments.
In this embodiment, according to the nonlinear equation iteration principle, the maximum offset of the transient frequency of the system can be calculated to be 0.14Hz, and the corresponding D max and D max when the maximum offset of the transient frequency of the system can be calculatedIt can be seen that the system transient frequency maximum offset is a highly complex nonlinear function of D max, and D max is the only unknown at a system transient frequency maximum offset of 0.14 Hz. Based on the physical significance of the damping coefficient D max of the power system, the effect of D max is to prevent the frequency of the system from shifting after disturbance (low frequency), so that the larger the D max is, the smaller the maximum shift of the transient frequency of the system is. In an actual power grid, D max must have an upper bound D up, and when the system damping is in the range of [0, D up ], the maximum offset of the system transient frequency is monotonically reduced along with the increase of D max, so that when the maximum offset of the system transient frequency is 0.14Hz, the unique D max corresponds to the maximum offset of the system transient frequency.
According to the relation between the transient frequency maximum deviation and the active power shortage of the system:
Wherein Deltaω max represents the maximum deviation of transient frequency of the system, deltaP represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the power system, K m represents the mechanical power gain, alpha, Omega n、tz is a function of the damping coefficient of the power system.
Wherein D max represents the power system damping coefficient, D state represents the system inherent damping coefficient, D i represents the damping coefficient of the ith electrolytic aluminum load, and n represents the total number of electrolytic aluminum loads connected.
Wherein H represents an inertia time constant of the system, F H represents a mechanical power percentage, T R represents a reheating time constant, deltaP represents a system active power deficiency, R represents a droop coefficient of a speed regulator, D max represents a damping coefficient of an electric power system, K m represents a mechanical power gain, alpha,Omega n、tz is a function of the damping coefficient of the power system.
When D max is increased from 0 to 10 under the same disturbance of the same system, the frequency response characteristic of the system is obtained, and as D max is increased, the transient frequency deviation and the steady frequency deviation of the system are both reduced.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method is characterized by comprising the following steps of: comprising the steps of (a) a step of,
Acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, and determining a transient maximum frequency offset range of the asynchronous power grid when the power shortage of the asynchronous power grid power system occurs;
Acquiring a transient maximum frequency offset of a real-time asynchronous power grid power system, and judging whether the offset is within the transient maximum frequency offset range of the asynchronous power grid power system;
if the total active power adjustment quantity of the electrolytic aluminum is within the range, calculating the total active power adjustment quantity of the electrolytic aluminum corresponding to a system frequency control target by combining a preset system frequency response model;
And according to the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target, completing the participation of the electrolytic aluminum load in the frequency auxiliary control adjustment of the power system of the asynchronous power grid.
2. The electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 1, wherein: the method comprises the steps of obtaining historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load, determining the transient maximum frequency offset range of the asynchronous power grid when the asynchronous power grid power system has power shortage,
When the system has power shortage, the transient frequency of the system is reduced, frequency deviation is generated, and a saturation reactor of electrolytic aluminum is introduced, so that the active power adjustment quantity and response speed of the electrolytic aluminum can automatically follow the frequency change of the system;
the relationship between the amount of change in the voltage drop of the saturable reactor and the system frequency deviation is as follows:
ΔVyj＝εk·Δfbias
Wherein DeltaV yj is the variation of the voltage drop of the saturation reactor, epsilon k is the frequency feedback control coefficient of each electrolytic aluminum load, and Deltaf bias is the system frequency deviation value;
And when the offset is not in the transient maximum frequency offset range of the asynchronous power grid power system, replacing other auxiliary control modes.
3. The electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 2, wherein: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
The relationship between the transient frequency maximum deviation and the active power absence of the system is as follows:
Wherein Deltaω max represents the maximum deviation of transient frequency of the system, deltaP represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the power system, K m represents the mechanical power gain, alpha, Omega n、tz is a function of the damping coefficient of the power system.
4. An electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 3, wherein: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
Wherein D max represents the power system damping coefficient, D state represents the system inherent damping coefficient, D i represents the damping coefficient of the ith electrolytic aluminum load, and n represents the total number of electrolytic aluminum loads connected.
5. The electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 4, wherein: the method for obtaining the historical operating parameters of the power system of the asynchronous power grid connected with the electrolytic aluminum load, and determining the transient maximum frequency offset range of the asynchronous power grid when the power shortage of the power system of the asynchronous power grid occurs further comprises,
Wherein H represents an inertia time constant of the system, F H represents a mechanical power percentage, T R represents a reheating time constant, deltaP represents a system active power deficiency, R represents a droop coefficient of a speed regulator, D max represents a damping coefficient of an electric power system, K m represents a mechanical power gain, alpha,Omega n、tz is a function of the damping coefficient of the power system.
6. The electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 5, wherein: the preset system frequency response model includes,
Wherein, H(s) represents a transfer function of a system frequency response model, H represents an inertia time constant of the system, deltaP G represents primary frequency modulation total power of the generator, deltaP ALΣ represents total adjustment quantity of active power of the electrolytic aluminum corresponding to a system frequency control target in which all electrolytic aluminum loads participate.
7. The electrolytic aluminum load participation asynchronous power grid frequency auxiliary control method according to claim 6, wherein: the preset system frequency response model further comprises,
Wherein Δp G represents the primary frequency modulation total power of the generator, Δp ALΣ represents the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target in which all electrolytic aluminum loads participate, D i represents the damping coefficient of the ith electrolytic aluminum load, n represents the total number of the electrolytic aluminum loads connected in, Δp represents the active power shortage of the system, R represents the droop coefficient of the speed regulator, D max represents the damping coefficient of the electric power system, and K m represents the mechanical power gain.
8. An electrolytic aluminum load participation asynchronous power grid frequency auxiliary control system is characterized in that: comprises a range acquisition module, a judgment module, a calculation module and a control and regulation module,
The range acquisition module is used for acquiring historical operation parameters of an asynchronous power grid power system connected with an electrolytic aluminum load and determining a transient maximum frequency offset range of the asynchronous power grid when the asynchronous power grid power system is in power shortage;
The judging module is used for acquiring the transient maximum frequency offset of the real-time asynchronous power grid power system and judging whether the offset is in the transient maximum frequency offset range of the asynchronous power grid power system;
The calculation module is used for calculating the total adjustment quantity of the active power of the electrolytic aluminum corresponding to the system frequency control target by combining a preset system frequency response model if the total adjustment quantity is within the range;
And the control and regulation module is used for completing the participation of electrolytic aluminum load in the frequency auxiliary control and regulation of the power system of the asynchronous power grid according to the total regulation quantity of the electrolytic aluminum active power corresponding to the system frequency control target.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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