CN116093978B - Self-contained power plant and load coordination control method and system oriented to power grid frequency modulation, electronic equipment and readable medium - Google Patents
Self-contained power plant and load coordination control method and system oriented to power grid frequency modulation, electronic equipment and readable medium Download PDFInfo
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- CN116093978B CN116093978B CN202310258227.5A CN202310258227A CN116093978B CN 116093978 B CN116093978 B CN 116093978B CN 202310258227 A CN202310258227 A CN 202310258227A CN 116093978 B CN116093978 B CN 116093978B
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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
- H02J3/241—The oscillation concerning frequency
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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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- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or 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 application provides a self-contained power plant and load coordination control method, a system, electronic equipment and a readable medium for power grid frequency modulation, which belong to the technical field of power grid frequency adjustment and comprise the following steps: acquiring the real-time frequency of a power grid; comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid; correcting the frequency deviation value; acquiring power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values; and adjusting the power of the load and the self-contained power plant based on the power deviation value. The self-contained power plant and the electric arc furnace participate in grid frequency modulation in a coordinated mode, so that a steel plant can provide good flexibility service for a power system, and the frequency transient stability of the power system is improved.
Description
Technical Field
The application relates to the technical field of power grid frequency regulation, in particular to a self-contained power plant and load coordination control method, system, electronic equipment and readable medium for power grid frequency modulation.
Background
The use of fossil energy is reduced, and the renewable energy ratio is further improved to be the future development trend. However, the generated energy of new energy sources such as light, wind and the like has strong randomness and fluctuation, the generated energy quality is low, and distributed power sources such as wind power, photovoltaic and energy storage are connected to a power grid through power electronic equipment, so that sufficient inertia is difficult to provide for the system. The reduction of the inertia of the power system results in the weakening of the anti-interference capability and the reduction of the system stability, the traditional method for stabilizing the frequency of the power system through the power supply side is difficult to realize the flexibility requirement, and the flexibility characteristics of the resources of the user side are necessary to be researched and fully utilized. The steel plant is taken as a typical industrial user, has large load capacity and high automation degree, and has a good flexibility regulation basis. An electric arc furnace in a steel plant belongs to a high-power industrial temperature control load, and has higher freedom degree in regulating time compared with other loads. In addition, steel plants are usually equipped with self-contained power plants, which can achieve rapid power interaction with the external grid. It can be seen that the users of the steel works can provide abundant flexible resources for the power system. However, the time for the load of the steel plant to participate in the transient response of the frequency of the power system is not too long, otherwise the normal production process in the plant is affected. How to put the load of the steel plant into the frequency transient response of the power system on the premise of ensuring normal production, and what strategy is adopted to cooperatively control the load of the steel plant and the power of the self-contained power plant so as to optimize the frequency modulation effect and provide flexible service for the power system better, and the method still lacks an effective solution.
Aiming at providing flexibility service for a power system in a steel plant, the management of the participation demand side of the steel plant in the prior study relates to the power system dispatching, and most of the steel plant is utilized to cut peaks and fill valleys of power load. The existing method comprises the steps of setting time-of-use electricity price, and enabling the steel plant to adjust load electricity consumption in the plant and the electricity generation amount of the self-contained power plant under the given electricity price of the power grid so as to achieve peak regulation effect. Similar strategies also include the steel works reporting their own power production and consumption conditions preset for a period of time in advance to assist the power suppliers in better scheduling of power generation for which the power suppliers can set lower electricity prices. However, in the method, the steel plant can only participate in the regulation and control of the power system in a large time scale range, the regulation period is long, and the method does not contribute to the transient stability of the power system. In areas with higher new energy permeability, the method for stably adjusting the transient frequency by using the traditional thermal power plant is difficult to eliminate the fluctuation of new energy power generation, and the regulation and control capability of the power supply side is insufficient, so that the normal operation of the system can be possibly influenced. The capacity of the thermal power generating unit at the power supply side is increased, the transient stability regulation and control capability of the system can be improved, but the actual utilization rate of the additionally increased unit is very low, the overlarge spare capacity can generate higher cost, and the economy and environmental friendliness are reduced. The industrial temperature control load is researched in literature to participate in primary frequency modulation of a power grid, the on-off state of the load is controlled according to the frequency of the power grid, the power grid frequency stability is improved to a certain extent, continuous adjustment cannot be realized, and the adjustment method has excessive influence on the normal production process of an electric arc furnace of a steel plant, so that the production safety problem is easily caused. The self-contained power plant of the steel plant can continuously adjust active power and reactive power, but due to capacity and the climbing rate limit value of the generator set, the response speed required for fast transient frequency regulation is difficult to meet by the self-contained power plant only. Therefore, in areas with high new energy occupation, the existing method has good peak regulation effect in iron and steel works, but is difficult to realize control targets in the aspect of transient frequency stability.
Disclosure of Invention
The application aims to provide a self-contained power plant and load coordination control method, a system, electronic equipment and a readable medium for power grid frequency modulation, which enable a steel plant to provide good flexibility service for a power system and improve the frequency transient stability of the power system through coordination participation of the self-contained power plant and an electric arc furnace in power grid frequency modulation.
The application provides a self-contained power plant and load coordination control method for power grid frequency modulation, which comprises the following steps: acquiring the real-time frequency of a power grid; comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid; correcting the frequency deviation value; acquiring power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values; and adjusting the power of the load and the self-contained power plant based on the power deviation value.
Further, correcting the frequency deviation value includes:
wherein f is the real-time frequency of the power grid, f 0 And dh is the dead zone link start signal value for the rated frequency.
Further, obtaining the power offset value of the load and the self-contained power plant based on the corrected frequency offset value includes: acquiring a load and a target power deviation value of the self-contained power plant based on the corrected frequency deviation value; and correcting the target power deviation value to obtain a power deviation value.
Further, the calculation formula of the target power deviation value of the self-contained power plant is as follows:
wherein DeltaP m0 For the self-contained power plant target power deviation value, s is Laplacian, T 1 For the time constant of the previous order filter, T 1 The value range of (C) is 3-25s, T 2 For the time constant of the latter order filter, T G Is the equivalent time constant of the self-contained power plant speed regulator, T T For the equivalent time constant of the power generation equipment, A is a control coefficient of a self-contained power plant side proportional link, and the value range of A is 0.2-0.4p.u.
The time constant T of the latter-order filter 2 The calculation formula of (2) is as follows:
wherein P is bid For the bid amount of the self-contained power plant participating in frequency modulation, R up And R is down An upward and a downward climb rate limit of the turbine, respectively.
Further, the calculation formula of the target power deviation value of the load is as follows:
wherein DeltaP load0 For the load target power deviation value, K is the in-plant load side proportion link control coefficient, s is the Laplacian operator, T 1 For the time constant of the previous order filter, T 1 The range of the value of (2) is 3-25s;
the calculation formula of K is as follows:
lambda is a correction coefficient, the value range is 1-2, P lin0 Rated for the load.
Further, the power deviation value of the load is calculated as follows:
wherein DeltaP Load Is the load power deviation value, P Lmax And P Lmin Maximum and minimum limits of load power, P lin0 Rated for the load.
Further, the power deviation of the self-contained power plant is calculated as follows:
ΔP m is the power deviation value, P of the self-contained power plant m0 Is the mechanical power, P, of a self-contained power plant of the steel plant under steady-state conditions mmax Is the upper power limit that a self-contained power plant can provide.
The second aspect of the application provides a self-contained power plant and load coordination control system oriented to power grid frequency modulation, which comprises the following components: the data acquisition module is used for acquiring the real-time frequency of the power grid; the comparison module is used for comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid; the correction module is used for correcting the frequency deviation value; the power calculation module is used for acquiring power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values; and the adjusting module is used for adjusting the power of the load and the self-contained power plant based on the power deviation value.
A third aspect of the present application provides an electronic device comprising a memory and a processor, the memory having stored therein a computer program, the processor being arranged to run the computer program to perform the grid-frequency modulation oriented self-contained power plant and load coordination control method described above.
A fourth aspect of the present application provides a computer readable medium, wherein a computer program is stored in the computer readable medium, and the computer program is configured to execute the self-owned power plant and the load coordination control method facing to the frequency modulation of the power grid when running.
Compared with the prior art, the self-contained power plant and the electric arc furnace are coordinated to participate in the power grid frequency modulation, so that the steel plant can provide good flexibility service for the power system, and the frequency transient stability of the power system is improved; secondly, when the load is brought into the power grid frequency modulation, the safe operation of the load is the most important consideration factor involved in the power grid frequency modulation, based on the fact that the front-order filter and the rear-order filter are set through the corresponding models, and the value rule of the K value is set, on the premise that the safe operation of the load is ensured, the initial adjustment speed of the transient process is higher, the maximum deviation value of the system frequency in the transient process is smaller, and the frequency change curve is smoother.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a self-contained power plant and load coordination control method for power grid frequency modulation provided by an embodiment of the application;
FIG. 2 is a schematic diagram of a calculation model according to an embodiment of the present application;
FIG. 3 is a block diagram of a self-contained power plant and a load coordination control system for power grid frequency modulation, which is provided by the embodiment of the application;
fig. 4 is a node diagram of a power grid system provided in embodiment 1 of the present application;
FIG. 5 is a schematic representation of a computational model provided in comparative example 2 of the present application;
FIG. 6 is a graph of grid frequency regulation for load step events within a primary frequency modulation time scale provided by an embodiment of the present application;
FIG. 7 is a graph of grid frequency regulation for generator turn-off events over a primary frequency modulation time scale provided by an embodiment of the present application;
FIG. 8 is a graph showing the change in arc furnace power during a transient state at a load step event provided by an embodiment of the present application;
FIG. 9 is a graph showing the variation of electric arc furnace power during transients during a generator shutdown event provided by an embodiment of the present application;
icon: 1-a data acquisition module; 2-a comparison module; 3-a frequency correction module; 4-a power calculation module; 40-a first calculation module; 41-a power correction module; 5-an adjustment module.
Detailed Description
The technical solutions of the present application will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
As shown in fig. 1 and fig. 2, the embodiment of the application provides a self-contained power plant and load coordination control method for power grid frequency modulation, which comprises the following steps:
s1, acquiring the real-time frequency of a power grid.
The working frequency of the power grid is an intuitive representation of the power grid energy, when the output of the power plant is equal to the power grid load, the working frequency of the power grid is the rated frequency, the rated frequency of the power grid in the prior art is usually 50Hz, when the output of the power plant is larger than the load, the working frequency of the power grid rises, and otherwise, when the output of the power plant is smaller than the power grid load, the power grid frequency falls. According to the principle, the application is based on the real-time frequency of the power grid, and the self-contained power plant and the electric arc furnace participate in the frequency modulation of the power grid in a coordinated manner, so that the steel plant can provide good flexibility service for the power system, and the frequency transient stability of the power system is improved.
According to the application, the frequency measuring device is arranged to accurately acquire the working frequency of the power grid in real time, so that the power of the self-contained power plant and the electric arc furnace is regulated, and the frequency transient stability of the power system is improved.
It should be noted that, the self-contained power plant in the application is electric energy generated by photovoltaic, wind energy, nuclear energy, coal and other energy sources, and the load is electric equipment with high rated power, such as an electric arc furnace.
S2, comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid.
In the prior art, the rated frequency of the power grid is usually 50Hz or 60Hz, and the frequency is the value of the rated frequency; when the real-time frequency of the power grid is larger than the rated frequency, the current frequency deviation value is a positive number value; when the real-time frequency of the power grid is smaller than the rated frequency, the current frequency deviation value is a negative number value; when the real-time frequency of the power grid is equal to the rated frequency, the current frequency deviation value is 0.
S3, correcting the frequency deviation value;
specifically, correcting the frequency deviation value includes:
wherein f is the real-time frequency of the power grid, f 0 And dh is the dead zone link start signal value for the rated frequency.
By setting the dead zone link, the control device is prevented from repeatedly operating due to a small error when the operating state is close to the rated frequency. As can be seen from the above formula, when the difference between the real-time frequency and the rated frequency of the power grid is smaller than dh, the frequency deviation value is 0, and when the difference between the real-time frequency and the rated frequency of the power grid is larger than dh, the frequency fluctuation amplitude is larger, and feedback adjustment is needed.
S4, acquiring power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values.
The step of obtaining the power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values comprises the following steps:
s40, acquiring target power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values.
The calculation formula of the target power deviation value of the self-contained power plant is as follows:
wherein DeltaP m0 For the self-contained power plant target power deviation value, s is Laplacian, T 1 For the time constant of the previous order filter, T 1 The value range of (C) is 3-25s, T 2 For the time constant of the latter order filter, T G Is the equivalent time constant of the self-contained power plant speed regulator, T T For the equivalent time constant of the power generation equipment, A is a control coefficient of a self-contained power plant side proportional link, and the value range of A is 0.2-0.4p.u. Wherein T is G And T T The test was performed using the prior art.
The time constant T of the latter-order filter 2 The calculation formula of (2) is as follows:
wherein P is bid For the bid amount of the self-contained power plant participating in frequency modulation, R up And R is down An upward and a downward climb rate limit of the turbine, respectively. By the arrangement, the constraint limit of the climbing rate of the self-contained power plant of the steel plant is considered, so that the model is closer to the actual production process, and the time constant of the first-order filter takes the value T 2 A faster response speed can be obtained.
The calculation formula of the target power deviation value of the load is as follows:
wherein DeltaP load0 For the load target power deviation value, K is the in-plant load side proportion link control coefficient, s is the Laplacian operator, T 1 For the time constant of the previous order filter, T 1 The range of the value of (2) is 3-25s;
the calculation formula of K is as follows:
lambda is a correction coefficient, the value range is 1-2/Hz, P lin0 Rated for the load.
In the application, by the method of T 1 、T 2 Parameters such as K and the like are limited, so that the transient stability of the system frequency can be improved, the initial adjustment speed of the transient process in the transient process is higher, the maximum deviation value of the system frequency in the transient process is smaller, and the frequency change curve is smoother.
S41, correcting the target power deviation value to obtain a power deviation value.
And according to the target power variation of the self-contained power plant of the steel plant and the load in the plant, combining the capacity limit of the self-contained power plant of the steel plant and the limit of normal production demand in the plant, and obtaining the set power deviation value of the self-contained power plant of the steel plant and the load in the plant.
The power deviation value of the load is calculated as follows:
wherein DeltaP Load Is the load power deviation value, P Lmax And P Lmin Maximum and minimum limits of load power, P lin0 Rated for the load.
The power deviation of the self-contained power plant is calculated as follows:
ΔP m is the power deviation value, P of the self-contained power plant m0 Is the mechanical power, P, of a self-contained power plant of the steel plant under steady-state conditions mmax Is the upper power limit that a self-contained power plant can provide.
S5, adjusting the power of the load and the self-contained power plant based on the power deviation value.
As shown in fig. 3, another aspect of the embodiment of the present application further provides a self-owned power plant and load coordination control system for grid frequency modulation, including:
the data acquisition module 1 is used for acquiring the real-time frequency of the power grid; the data acquisition module 1 may be configured to execute step S1 in the embodiment of the present application;
the comparison module 2 is used for comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid; the comparison module 2 may be configured to perform step S2 in the embodiment of the present application;
a frequency correction module 3 for correcting the frequency deviation value; the frequency correction module 3 may be configured to perform step S3 in the embodiment of the present application;
the power calculation module 4 is used for acquiring power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values; the correction module 4 may be configured to perform step S4 in the embodiment of the present application;
the power calculation module 4 may further include:
the first calculation module 40, the first calculation module 40 obtains the load and the target power deviation value of the self-contained power plant based on the corrected frequency deviation value. The first computing module 40 may be configured to perform step S40 in the embodiment of the present application;
and the power correction module 41 corrects the target power deviation value by the power correction module 41 to obtain a power deviation value. The power correction module 41 may be configured to perform step S41 in the embodiment of the present application;
the adjusting module 5 adjusts the power of the load and the self-contained power plant based on the power deviation value.
In a third aspect of the application, an electronic device is provided, comprising a memory and a processor, the memory storing a computer program, the processor being arranged to run the computer program to perform the grid-frequency modulation oriented self-contained power plant and the load coordination control method described above.
In an embodiment of the application, an electronic device includes a storage medium, a processor, and a computer program stored in the storage medium and executable by the processor, the computer program implementing the method when executed by the processor. The electronic device of the present application may include one or more of the following components: a memory, a processor, and one or more application programs, wherein the one or more application programs may be stored in the memory and configured to be executed by the one or more processors, the one or more program configured to perform the method as described in the foregoing method embodiments.
The Memory may include random access Memory (Random Access Memory, RAM) or Read-Only Memory (ROM). The memory may be used to store instructions, programs, code sets, or instruction sets. The memory may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a histogram equalization function, etc.), instructions for implementing the various method embodiments described below, etc. The storage data area may also store data created by the electronic device in use (such as image matrix data, etc.).
The processor may include one or more processing cores. The processor uses various interfaces and lines to connect various portions of the overall electronic device, perform various functions of the electronic device, and process data by executing or executing instructions, programs, code sets, or instruction sets stored in memory, and invoking data stored in memory. Alternatively, the processor may be implemented in hardware in at least one of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU) and a modem etc. Wherein, the CPU mainly processes an operating system, application programs and the like; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor and may be implemented solely by a single communication chip.
In a fourth aspect of the present application, a computer readable medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the grid-frequency modulation oriented self-contained power plant and the load coordination control method when running.
Example 1
Taking the 10-machine 39-node power system shown in fig. 4 as an example, the node 29 is taken as an in-out line node of an electric structure of the steel plant, the Load29 directly connected with the node 29 is an in-plant Load of the steel plant, wherein the electric arc furnace is included, and the generator G9 connected with the node 38 is a self-contained power plant generator set of the steel plant. The system physical parameters and control parameters in the examples are shown in tables 1-2.
Table 1 physical parameters of each plant in the system
Control parameter values in the Table 2 algorithm
To verify the effectiveness of the controller, two transient events that can cause grid frequency fluctuations, namely an external grid load step event and a generator shutdown event, are constructed. The load active and reactive power at node 25 in the load step event is stepped from 224MW, 80Mvar to 448MW, 160Mvar, respectively, and the genset G8 suddenly breaks in the generator trip event.
In order to compare the superiority of the proposed solution of the present application, two comparative examples are used for illustration, wherein comparative example 1 is a steel plant not participating in primary frequency modulation; comparative example 2 is a steel plant with only a self-contained power plant involved in primary frequency modulation, and its model is shown in fig. 5.
FIG. 6 is a graph of grid frequency regulation for load step events over a primary frequency modulation time scale; FIG. 7 is a graph of grid frequency regulation for generator shutdown events over a primary frequency modulation time scale. It can be seen that the primary frequency modulation is participated in by the self-contained power plant of the steel plant and the coordination controller of the electric arc furnace, compared with the primary frequency modulation is not participated in by the steel plant or only participated in by the self-contained power plant of the steel plant, the primary regulation speed of the transient process is faster, the maximum deviation value of the system frequency in the transient process is smaller, and the frequency change curve is smoother.
FIG. 8 is a graph showing the change in arc furnace power during a transient state at a load step event; fig. 9 is a graph of the change in arc furnace power during a transient in the event of a generator shutdown. It can be seen that in the scenario that the self-contained power plant of the steel plant and the electric arc furnace coordination controller participate in primary frequency modulation, the electric arc furnace power is rapidly reduced in a short time when a transient event occurs so as to compensate for the power shortage caused by the transient event. In the initial stage of the transient process, the absolute value of a high-frequency signal delta fH obtained by the frequency deviation signal through a first-order filter is larger, so that the power of the electric arc furnace is fast in descending speed, the absolute value of the delta fH gradually tends to be stable along with the system frequency, the absolute value of the delta fH gradually tends to be reduced, the delta fh=0 is achieved after the system is stable, and the power of the electric arc furnace is recovered to the power at the time of steady state. In the whole transient process, the duration of the reduction of the operating power of the electric arc furnace is in the second level, and the upper and lower limits of the power operation are set, so that the normal operation process of the iron and steel plant is basically not influenced.
Compared with the conventional primary frequency modulation of the self-contained power plant, the time for the self-contained power plant of the steel plant and the electric arc furnace cooperative controller of the electric arc furnace to reach the steady state by using the filter is prolonged, the steady state frequency of the power grid is not changed, and the resistance to frequency deviation in the transient process is considerable. The frequency in the later stage of the transient process is close to the steady-state frequency, the harm phase difference to the power system is not large, the influence of frequency extreme value fluctuation impact appearing in the earlier stage of the transient process on the system is more severe relatively, and the controller provided by the application can effectively reduce the impact, remarkably improve the frequency response curve level and improve the transient stability of the power system.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (6)
1. A self-contained power plant and load coordination control method for power grid frequency modulation is characterized by comprising the following steps:
acquiring the real-time frequency of a power grid;
comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid;
correcting the frequency offset value, comprising:
wherein f is the real-time frequency of the power grid, f 0 Dh is the dead zone link start signal value for the rated frequency;
acquiring the power deviation values of the load and the self-contained power plant based on the corrected frequency deviation values, including: acquiring a load and a target power deviation value of the self-contained power plant based on the corrected frequency deviation value; correcting the target power deviation value to obtain a power deviation value;
and adjusting the power of the load and the self-contained power plant based on the power deviation value, wherein the calculation formula of the target power deviation value of the self-contained power plant is as follows:
wherein DeltaP m0 For the self-contained power plant target power deviation value, s is Laplacian, T 1 For the time constant of the previous order filter, T 1 The value range of (C) is 3-25s, T 2 For the time constant of the latter order filter, T G Is the equivalent time constant of the self-contained power plant speed regulator, T T For the equivalent time constant of the power generation equipment, A is a control coefficient of a self-contained power plant side proportional link, and the value range of A is 0.2-0.4p.u.
The time constant T of the latter-order filter 2 The calculation formula of (2) is as follows:
wherein P is bid For the bid amount of the self-contained power plant participating in frequency modulation, R up And R is down An upward climbing rate limit and a downward climbing rate limit of the turbine respectively;
the calculation formula of the target power deviation value of the load is as follows:
wherein DeltaP load0 For the load target power deviation value, K is the control coefficient of the load side proportion link in the plant, s is the Laplacian operator, T 1 For the former oneOrder filter time constant, T 1 The range of the value of (2) is 3-25s;
the calculation formula of K is as follows:
lambda is a correction coefficient, the value range is 1-2, P lin0 Rated power for the load;
the load is an arc furnace.
2. The grid frequency modulation oriented self-contained power plant and load coordination control method of claim 1, wherein,
the power deviation value of the load is calculated as follows:
wherein DeltaP Load Is the load power deviation value, P Lmax And P Lmin Maximum and minimum limits of load power, P lin0 Rated for the load.
3. The grid frequency modulation oriented self-contained power plant and load coordination control method of claim 2, wherein,
the power deviation of the self-contained power plant is calculated as follows:
ΔP m is the power deviation value, P of the self-contained power plant m0 Is the mechanical power, P, of a self-contained power plant of the steel plant under steady-state conditions mmax Is the upper power limit that a self-contained power plant can provide.
4. A self-contained power plant and load coordination control system oriented to power grid frequency modulation is characterized by comprising:
the data acquisition module is used for acquiring the real-time frequency of the power grid;
the comparison module is used for comparing the real-time frequency of the power grid with the rated frequency to obtain a frequency deviation value of the power grid;
a frequency correction module, configured to correct the frequency deviation value, including:
wherein f is the real-time frequency of the power grid, f 0 Dh is the dead zone link start signal value for the rated frequency;
the power calculation module obtains the power deviation value of the load and the self-contained power plant based on the corrected frequency deviation value, and comprises the following steps: acquiring a load and a target power deviation value of the self-contained power plant based on the corrected frequency deviation value; correcting the target power deviation value to obtain a power deviation value;
the adjusting module is used for adjusting the power of the load and the power of the self-contained power plant based on the power deviation value, and the calculation formula of the target power deviation value of the self-contained power plant is as follows:
wherein DeltaP m0 For the self-contained power plant target power deviation value, s is Laplacian, T 1 For the time constant of the previous order filter, T 1 The value range of (C) is 3-25s, T 2 For the time constant of the latter order filter, T G Is the equivalent time constant of the self-contained power plant speed regulator, T T For the equivalent time constant of the power generation equipment, A is a control coefficient of a self-contained power plant side proportional link, and the value range of A is 0.2-0.4p.u.
The time constant T of the latter-order filter 2 The calculation formula of (2) is as follows:
wherein P is bid For the bid amount of the self-contained power plant participating in frequency modulation, R up And R is down An upward climbing rate limit and a downward climbing rate limit of the turbine respectively;
the calculation formula of the target power deviation value of the load is as follows:
wherein DeltaP load0 For the load target power deviation value, K is the control coefficient of the load side proportion link in the plant, s is the Laplacian operator, T 1 For the time constant of the previous order filter, T 1 The range of the value of (2) is 3-25s;
the calculation formula of K is as follows:
lambda is a correction coefficient, the value range is 1-2, P lin0 Rated power for the load;
the load is an arc furnace.
5. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the grid frequency modulation oriented self-contained power plant and load coordination control method of any of claims 1-3.
6. A computer readable medium, characterized in that the computer readable medium has stored therein a computer program, wherein the computer program is arranged to execute the grid frequency modulation oriented self-contained power plant and the load coordination control method according to any of claims 1-3 when run.
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