CN116599082A - Frequency adjusting method and frequency adjusting device of nuclear power unit - Google Patents
Frequency adjusting method and frequency adjusting device of nuclear power unit Download PDFInfo
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- CN116599082A CN116599082A CN202310610957.7A CN202310610957A CN116599082A CN 116599082 A CN116599082 A CN 116599082A CN 202310610957 A CN202310610957 A CN 202310610957A CN 116599082 A CN116599082 A CN 116599082A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a frequency adjusting method and a frequency adjusting device of a nuclear power unit. The frequency adjustment method of the nuclear power unit provided by the embodiment of the invention comprises the steps of obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit, wherein the unit load parameters comprise a unit load range and a unit work load; determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid; and responding to the load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter. The technical scheme provided by the embodiment realizes the rapid adjustment of the power grid frequency through the primary frequency modulation of the nuclear power unit, meets the requirement of small load of rapid lifting of the nuclear power unit, and ensures the stable operation of the power grid.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a frequency adjusting method and a frequency adjusting device of a nuclear power unit.
Background
When the power grid frequency changes to a certain extent, in order to ensure the stability of the power grid frequency, the power grid frequency can be regulated in a primary frequency modulation mode. With the development of the electric power market, the primary frequency modulation function can be realized through a nuclear power unit. The existing nuclear power unit generally responds slowly in the primary frequency modulation process, and the problem that the maximum power of the nuclear power unit can be exceeded in the adjustment process is solved. Therefore, a control method capable of rapidly and stably completing the primary frequency modulation process is required.
Disclosure of Invention
The invention provides a frequency adjusting method and a frequency adjusting device for a nuclear power unit, which are used for solving the problems that the response speed of the nuclear power unit is low and the nuclear power unit is not stable enough in the primary frequency modulation process.
According to an aspect of the present invention, there is provided a frequency adjustment method of a nuclear power unit, including:
obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit, wherein the unit load parameters comprise a unit load range and a unit work load;
determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid;
and responding to the load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter.
Optionally, the determining a first frequency modulation parameter according to the core thermal power, the unit load range and the frequency parameter of the power grid includes:
determining an initial frequency adjustment amount of the power grid according to the target frequency of the power grid and the actual frequency of the power grid, wherein the frequency parameters of the power grid comprise the target frequency of the power grid and the actual frequency of the power grid;
and determining the first frequency modulation parameter according to the reactor core thermal power, the unit load range and the initial frequency adjustment quantity of the power grid.
Optionally, the determining the first tuning parameter according to the core thermal power, the unit load range and the initial frequency adjustment amount of the power grid includes:
comparing the initial frequency adjustment quantity of the power grid with the unit load range to obtain a first comparison result;
determining the first frequency modulation parameter according to the first comparison result;
comparing the sum of the core thermal power and the first frequency modulation parameter with the maximum value of the core thermal power to obtain a second comparison result;
and adjusting the first frequency modulation parameter according to the second comparison result.
Optionally, after determining the first tuning parameter according to the core thermal power, the unit load range and the frequency parameter of the power grid, the method further includes:
and generating a second frequency modulation instruction according to the first frequency modulation parameter and the unit work load.
Optionally, the generating a second frequency modulation instruction according to the first frequency modulation parameter and the unit workload includes:
determining a preset adjustment quantity of the first frequency modulation parameter according to the unit work load;
and calculating a second frequency modulation instruction according to the product of the first frequency modulation parameter and the preset adjustment quantity.
Optionally, after the generating the second tuning instruction according to the first tuning parameter and the unit workload, the method further includes:
and generating a first valve instruction according to the second frequency modulation instruction and the valve characteristic curve.
Optionally, after determining the first tuning parameter according to the core thermal power, the unit load range and the frequency parameter of the power grid, the method further includes:
and if the absolute value of the first frequency modulation parameter is larger than zero, adjusting the load change rate of the load adjusting instruction of the nuclear power unit to zero.
Optionally, the responding to the load adjusting instruction of the nuclear power unit generates a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter, and the method includes:
determining the load adjustment quantity of the nuclear power unit according to the load adjustment instruction of the nuclear power unit;
calculating a second frequency modulation parameter according to the sum of the load adjustment quantity of the nuclear motor unit and the first frequency modulation parameter;
determining the current load quantity of the nuclear power unit according to the unit work load;
and generating a first frequency modulation instruction according to the difference value between the second frequency modulation parameter and the current load capacity of the nuclear power unit.
Optionally, after the generating the first tuning instruction according to the unit workload and the first tuning parameter in response to the load adjustment instruction of the nuclear power unit, the method further includes:
and determining a second valve instruction according to the first frequency modulation instruction and the valve characteristic curve.
In a second aspect, an embodiment of the present invention provides a frequency adjustment device of a nuclear power unit, including:
the acquisition module is used for acquiring core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit;
the calculation module is used for determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid;
and the control module is used for responding to the load adjusting instruction of the nuclear power unit and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter.
According to the technical scheme provided by the embodiment of the invention, the core thermal power of the nuclear power unit, the unit load parameter and the frequency parameter of the power grid are obtained. Wherein the unit load parameters include a unit load range and a unit workload. And determining a first frequency modulation parameter according to the core thermal power, the unit load range and the frequency parameter of the power grid. And responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter. According to the frequency adjusting method for the nuclear power unit, the first frequency modulation instruction is generated to adjust the frequency of the power grid through the obtained core thermal power of the nuclear power unit, the unit load parameters and the frequency parameters of the power grid, so that the rapid adjustment of the frequency of the power grid through primary frequency modulation of the nuclear power unit is realized, the requirement of small load of rapid lifting of the nuclear power unit is met, and the stable operation of the power grid is ensured.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for adjusting frequency of a nuclear power unit according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a primary frequency modulation process according to an embodiment of the present invention;
FIG. 4 is a flow chart of yet another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 5 is a flow chart of yet another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 6 is a flow chart of yet another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 7 is a flow chart of yet another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 8 is a flow chart of yet another method for frequency adjustment of a nuclear power unit provided by an embodiment of the present invention;
FIG. 9 is a schematic diagram of another primary frequency modulation process according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a frequency adjustment device of a nuclear power unit according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled 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.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a frequency adjustment method of a nuclear power unit according to an embodiment of the present invention. Referring to fig. 1, a method for adjusting frequency of a nuclear power unit according to an embodiment of the present invention includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
Wherein, the unit load parameters comprise a unit load range and a unit work load;
specifically, the current running state of the power grid can be determined by acquiring the frequency parameters of the power grid, so as to judge whether the frequency of the power grid needs to be adjusted. The core thermal power and the unit work load of the nuclear power unit are obtained to reflect the working state of the nuclear power unit, so that the adjustment quantity required by the load of the nuclear power unit is determined. The unit load range is used for determining the working range of the nuclear power unit, so that the safety can be improved by adjusting the nuclear power unit within the unit load range.
S102, determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid.
Specifically, the frequency difference of the power grid can be determined according to the acquired frequency parameters of the power grid, and then the primary frequency modulation parameters can be determined according to the frequency difference of the power grid, the core thermal power and the unit load range. The primary frequency modulation parameter reflects the load amount required by the nuclear power unit, namely, the load of the nuclear power unit is adjusted according to the first frequency modulation parameter, so that the acting size of steam in the steam turbine can be controlled, the power of a generator connected with the steam turbine is controlled, and the frequency of a power grid is adjusted.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Specifically, the nuclear power unit generally adopts an automatic load control mode or a manual control mode to adjust the unit load, and in the automatic load control mode, the nuclear power unit adjusts the unit load according to the obtained load adjustment instruction. When the load quantity of the nuclear power unit needs to be changed to adjust the frequency of the power grid, the load adjusting instruction of the current nuclear power unit needs to be confirmed. Based on the unit work load of the current nuclear power unit, the first frequency modulation parameter is adjusted through the load adjustment instruction, and the first frequency modulation instruction for adjusting the unit load can be generated, so that the power grid frequency is adjusted.
When the frequency of the power grid is regulated, the core thermal power of the nuclear power unit, the unit load range, the unit work load and the frequency parameter of the power grid are firstly obtained, the frequency difference of the current power grid is determined through the frequency parameter of the power grid, and then the primary frequency modulation parameter is determined according to the frequency difference of the power grid, the core thermal power and the unit load range. Confirming a load adjusting instruction of the current nuclear power unit, adjusting the first frequency modulation parameter through the load adjusting instruction based on the unit work load of the current nuclear power unit, and generating a first frequency modulation instruction for adjusting the unit load. After the load of the unit is regulated through the first frequency modulation instruction, the power of the generator is changed, and then the frequency of the power grid is regulated.
According to the frequency adjusting method for the nuclear power unit, the first frequency modulation instruction is generated through the obtained core thermal power of the nuclear power unit, the unit load parameters and the frequency parameters of the power grid. The first frequency modulation instruction adjusts the load of the nuclear power unit so as to adjust the frequency of the power grid. The frequency adjustment method of the nuclear power unit provided by the embodiment realizes the rapid adjustment of the frequency of the power grid through primary frequency modulation of the nuclear power unit, meets the requirement of small load of rapid lifting of the nuclear power unit, and ensures the stable operation of the power grid.
Optionally, fig. 2 is a flowchart of another method for adjusting a frequency of a nuclear power unit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S201, determining initial frequency adjustment quantity of the power grid according to the target frequency of the power grid and the actual frequency of the power grid.
Wherein the frequency parameters of the power grid include a target frequency of the power grid and an actual frequency of the power grid.
Specifically, according to the actual frequency of the power grid and the target frequency of the power grid, the frequency difference of the power grid to be adjusted can be determined, the frequency difference of the power grid and the initial frequency adjustment quantity of the power grid form a functional relation, the frequency difference of the power grid is input into a primary frequency modulation function, and the initial frequency adjustment quantity of the power grid can be determined. The initial frequency adjustment amount of the power grid is the load amount required to be adjusted for the nuclear power unit to adjust the power grid frequency to the target frequency based on the frequency difference of the power grid.
S202, determining the first frequency modulation parameter according to the reactor core thermal power, the unit load range and the initial frequency adjustment quantity of the power grid.
Specifically, the initial frequency adjustment amount of the power grid is a frequency adjustment amount required by the power grid determined according to the frequency difference of the power grid. The frequency adjustment quantity which can be realized by the nuclear power unit is needed to be adjusted according to the core thermal power and the unit load range of the nuclear power unit, so that the initial frequency adjustment quantity of the power grid becomes a first frequency modulation parameter which meets the limiting condition of the nuclear power unit. The load of the nuclear power unit can be adjusted through the first frequency modulation parameter, the load range of the unit can not be exceeded, and further safety and stability of the nuclear power unit are guaranteed.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Fig. 3 is a schematic diagram of a primary frequency modulation process according to an embodiment of the present invention. Referring to fig. 3, a is an actual frequency of a power grid, B is a target frequency of the power grid, C is a unit load, D is a load adjustment instruction, E is a first frequency modulation parameter, F is a first frequency modulation instruction, and G is a valve instruction. The primary frequency modulation basic process is as follows: and determining the frequency difference of the power grid based on the difference value between the target frequency B of the power grid and the actual frequency A of the power grid, and generating a first frequency modulation parameter E according to the frequency difference of the power grid and the primary frequency modulation function. And under the automatic load mode, the nuclear power unit outputs a load adjusting instruction D according to the unit load C. And (3) the sum of the adjustment quantity of the first frequency modulation parameter E and the adjustment quantity of the load adjustment instruction D is differed with the unit load C to obtain a first frequency modulation instruction F. And inputting the first frequency modulation command F into a valve characteristic curve to generate a valve command G. The valve command G adjusts the opening of the valve, and then controls the acting of the steam in the steam turbine, so as to control the power of a generator connected with the steam turbine, and further adjust the frequency of a power grid.
Optionally, fig. 4 is a flowchart of a frequency adjustment method of a nuclear power unit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S201, determining initial frequency adjustment quantity of the power grid according to the target frequency of the power grid and the actual frequency of the power grid.
S301, comparing the initial frequency adjustment quantity of the power grid with the unit load range to obtain a first comparison result.
Specifically, the unit load range is a load range in which the nuclear power unit can stably operate. If the initial frequency adjustment quantity of the power grid exceeds or is lower than the unit load range, the adjustment quantity of the nuclear power unit needs to be determined according to the maximum or minimum value of the unit load range. The arrangement can further improve the safety and stability of the nuclear power unit.
S302, determining the first frequency modulation parameter according to the first comparison result.
Specifically, when the initial frequency adjustment quantity of the power grid exceeds the unit load range, taking the maximum value of the unit load range as the frequency adjustment quantity, and taking the difference between the maximum value of the unit load range and the current unit load as the first frequency modulation parameter. When the initial frequency adjustment quantity of the power grid is lower than the unit load range, taking the minimum value of the unit load range as the frequency adjustment quantity, and taking the difference between the minimum value of the unit load range and the current unit load as the first frequency modulation parameter. For example, if the current unit load is 98%, and the initial frequency adjustment amount of the power grid is 104%, 100% is taken as the frequency adjustment amount, and the first frequency modulation parameter is the difference between the maximum value of the unit load range and the current unit load, namely 2%. If the current unit load is 82% and the initial frequency adjustment amount of the power grid is 79%, 80% is used as the frequency adjustment amount, and the first frequency modulation parameter is the difference between the current unit load and the minimum value of the unit load range, namely 2%.
S303, comparing the sum of the core thermal power and the first frequency modulation parameter with the maximum value of the core thermal power to obtain a second comparison result.
Specifically, if the core thermal power of the nuclear power unit exceeds the maximum value of rated power, the safety of the nuclear power unit is affected. The sum of the current core thermal power and the first tuning parameter of the nuclear power unit cannot exceed the maximum value of the core thermal power. The arrangement can further improve the safety and stability of the nuclear power unit.
S304, adjusting the first frequency modulation parameter according to the second comparison result.
Specifically, if the sum of the current core thermal power and the first frequency modulation parameter of the nuclear power unit is greater than the maximum value of the core thermal power, taking the difference between the maximum value of the core thermal power and the current core thermal power of the nuclear power unit as the first frequency modulation parameter. If the sum of the current core thermal power and the first frequency modulation parameter of the nuclear power unit is smaller than or equal to the maximum value of the core thermal power, the first frequency modulation parameter does not need to be adjusted.
Illustratively, when the current core thermal power of the nuclear power unit is 80%, if the first tuning parameter is 3%, and the sum of the current core thermal power and the first tuning parameter of the nuclear power unit is smaller than the maximum value of the core thermal power, the first tuning parameter is unchanged. When the current core thermal power of the nuclear power unit is 98.6%, if the first frequency modulation parameter is 2%, and the sum of the current core thermal power and the first frequency modulation parameter of the nuclear power unit is greater than the maximum value of the core thermal power, the first frequency modulation parameter is adjusted to be 1.4%.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Optionally, fig. 5 is a flowchart of a frequency adjustment method of a nuclear power unit according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S102, determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid.
S401, generating a second frequency modulation instruction according to the first frequency modulation parameter and the unit workload.
Specifically, according to the unit work load of the current nuclear power unit, a second frequency modulation instruction can be generated through the first frequency modulation parameter, the second frequency modulation instruction can be used for feedforward adjustment, and the load of the nuclear power unit is partially adjusted through the second frequency modulation instruction, so that the frequency of a power grid starts to change. This arrangement can increase the grid frequency regulation speed.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Optionally, fig. 6 is a flowchart of a frequency adjustment method of a nuclear power unit according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S102, determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid.
S501, determining a preset adjustment amount of the first frequency modulation parameter according to the unit workload.
Specifically, according to the unit work load of the current nuclear power unit, the first frequency modulation parameter can be adjusted through a preset adjustment amount, so that the feedforward adjustment requirement of the nuclear power unit is met. The value of the preset adjustment amount is greater than or equal to 0 and less than or equal to 1. By way of example, the preset adjustment is set to 1 when the unit workload of the nuclear power unit is 80%, to 0.7 when the unit workload of the nuclear power unit is 90%, and to 0.5 when the unit workload of the nuclear power unit is 95%.
S502, calculating a second frequency modulation instruction according to the product of the first frequency modulation parameter and the preset adjustment quantity.
Specifically, after a preset adjustment amount is determined according to the unit work load of the nuclear power unit, the product of the preset adjustment amount and the first frequency modulation parameter is the second frequency modulation instruction. Benefits of such an arrangement include: the completion speed of primary frequency modulation can be increased by the feedforward adjustment of the second frequency modulation instruction. When the working load of the unit is in a higher level, the first frequency modulation parameter is adjusted to be a smaller value by the preset adjustment amount, so that the core thermal power in the adjustment process can be prevented from exceeding the maximum value, and the safety and stability of the nuclear power unit are further ensured.
An alternative embodiment, after calculating a second tuning instruction according to the product of the first tuning parameter and the preset tuning amount, the method may further include:
s601, generating a first valve instruction according to the second frequency modulation instruction and the valve characteristic curve.
Specifically, the second frequency modulation instruction is input into a valve characteristic curve of the valve, a first valve instruction can be generated and used for adjusting the flow of steam entering the high-pressure cylinder or the low-pressure cylinder through the valve, the steam quantity can be adjusted to control the acting of the steam in the steam turbine, so that the power of a generator connected with the steam turbine is changed, and the frequency of a power grid is adjusted.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Optionally, fig. 7 is a flowchart of a frequency adjustment method of a nuclear power unit according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 7, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S102, determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid.
And S701, if the absolute value of the first frequency modulation parameter is larger than zero, adjusting the load change rate of the load adjusting instruction of the nuclear power unit to zero.
Specifically, the load adjusting instruction of the nuclear power unit is used for adjusting the work load of the nuclear power unit, and when the adjusting direction of the load instruction is opposite to the adjusting direction of the first frequency modulation parameter, the condition that the adjusting instruction counteracts can occur, so that the load of the unit is underadjusted. When the adjusting direction of the load command is communicated with the adjusting direction of the first frequency modulation parameter, the superposition condition can occur, and the unit load is over-adjusted. If the absolute value of the first frequency modulation parameter is larger than zero, the nuclear power unit is used for adjusting the power grid frequency through the first frequency modulation parameter, at the moment, the load change rate of a load adjusting instruction of the nuclear power unit can be adjusted to zero, namely the load adjusting instruction is not changed any more, and only the current working load of the nuclear power unit is maintained until the adjustment is completed. The arrangement can further ensure the effect of adjusting the frequency of the power grid and prevent the condition of undershoot or overshoot of the load of the unit.
S103, responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and a first frequency modulation parameter.
Optionally, fig. 8 is a flowchart of a frequency adjustment method of a nuclear power unit according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 8, the frequency adjustment method of the nuclear power unit includes:
s101, obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit.
S102, determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid.
S801, determining the load adjustment quantity of the nuclear power unit according to the load adjustment instruction of the nuclear power unit.
Specifically, according to the load adjustment instruction of the nuclear power unit, the load adjustment amount of the maintenance work of the current nuclear power unit can be determined. The load of the nuclear power unit needs to be adjusted on the basis of the load adjustment quantity. The load of the unit can be adjusted on the basis of keeping the nuclear power unit to stably operate.
S802, calculating a second frequency modulation parameter according to the sum of the load adjustment quantity of the nuclear motor unit and the first frequency modulation parameter.
Specifically, the sum of the load adjustment amount and the first frequency modulation parameter is the second frequency modulation parameter.
S803, determining the current load quantity of the nuclear power unit according to the unit work load.
Specifically, according to the unit work load of the nuclear power unit, the actual load quantity of the nuclear power unit can be determined. The load of the nuclear power unit in the actual running process may deviate from the load adjusting instruction to a certain extent, and the load of the nuclear power unit needs to be adjusted according to the actual load quantity.
S804, generating a first frequency modulation instruction according to the difference value between the second frequency modulation parameter and the current load capacity of the nuclear power unit.
Specifically, the difference between the second frequency modulation parameter and the load of the current nuclear power unit is the adjustment quantity required by the load of the nuclear power unit, and the first frequency modulation instruction can be generated according to the adjustment quantity required by the load of the nuclear power unit.
An optional implementation manner, after generating the first frequency modulation instruction according to the difference between the second frequency modulation parameter and the current load capacity of the nuclear power unit, the method may further include:
and S901, determining a second valve instruction according to the first frequency modulation instruction and the valve characteristic curve.
Specifically, the first frequency modulation instruction is output to a valve characteristic curve of a valve, a second valve instruction can be generated and used for adjusting the flow of steam entering a high-pressure cylinder or a low-pressure cylinder through the valve, the steam quantity can be adjusted to control the acting of the steam in a steam turbine, so that the power of a generator connected with the steam turbine is changed, and the frequency of a power grid is adjusted.
Illustratively, when adjusting the grid frequency, core thermal power of the nuclear power unit, a unit load range, a unit workload, an actual frequency of the grid, and a target frequency of the grid are first obtained. According to the actual frequency of the power grid and the target frequency of the power grid, the frequency difference of the power grid to be regulated is determined, the frequency difference of the power grid is input into a primary frequency modulation function, and the initial frequency regulation quantity of the power grid can be determined. And after the initial frequency adjustment quantity of the power grid is adjusted through the core thermal power of the nuclear power unit and the unit load range, obtaining a first frequency modulation parameter. And if the absolute value of the first frequency modulation parameter is larger than zero, the load change rate of the load regulation command of the nuclear power unit is regulated to zero, so that the condition of undershooting or overshoot of the unit load is prevented.
And adjusting the first frequency modulation parameter according to the unit work load of the current nuclear power unit by a preset adjustment amount to obtain a second frequency modulation instruction for feedforward adjustment. And inputting the second frequency modulation instruction into a valve characteristic curve of the valve to generate a first valve instruction to control the valve so as to regulate the frequency of the power grid. And determining the load adjustment quantity of the current nuclear power unit maintaining work according to the load adjustment instruction of the nuclear power unit, wherein the sum of the load adjustment quantity and the first frequency modulation parameter is the second frequency modulation parameter.
And determining the actual load quantity of the nuclear power unit according to the unit work load of the nuclear power unit, wherein the difference value between the second frequency modulation parameter and the current load quantity of the nuclear power unit is the adjustment quantity required by the load of the nuclear power unit, and generating a first frequency modulation instruction according to the adjustment quantity required by the load of the nuclear power unit. And outputting the first frequency modulation instruction to a valve characteristic curve of the valve to generate a second valve instruction to control the valve, so as to regulate the frequency of the power grid. The frequency adjusting method of the nuclear power unit provided by the embodiment of the invention realizes the rapid adjustment of the frequency of the power grid through primary frequency modulation of the nuclear power unit, meets the requirement of small load of rapid lifting of the nuclear power unit, and ensures the stable operation of the power grid. And the feedforward circuit is arranged, so that the frequency modulation speed is increased, the load range of the nuclear power unit is considered, and the safety and stability of the nuclear power unit are improved.
Fig. 9 is a schematic diagram of another primary frequency modulation process according to an embodiment of the present invention. Referring to fig. 9, a is an actual frequency of a power grid, B is a target frequency of the power grid, C is a unit load, D is a load adjustment command, E is a first tuning parameter, F is a first tuning command, G is a valve command, H is core thermal power, I is a second tuning command, and J is an initial frequency adjustment amount of the power grid. The valve instructions G include a first valve instruction and a second valve instruction.
The primary frequency modulation basic process is as follows: and determining the frequency difference of the power grid based on the difference value between the target frequency B of the power grid and the actual frequency A of the power grid, and determining the initial frequency adjustment quantity J of the power grid according to the frequency difference and the primary frequency modulation function of the power grid. And obtaining a first frequency modulation parameter E after limiting the initial frequency adjustment quantity J of the power grid by the unit load C and the reactor core thermal power H. And under the automatic load mode, the nuclear power unit outputs a load adjusting instruction D according to the unit load C. And if the absolute value of the first frequency modulation parameter E is larger than zero, the load change rate of the load adjustment instruction D is adjusted to zero. And adjusting the first frequency modulation parameter E according to the unit work load C of the current nuclear power unit by a preset adjustment quantity to obtain a second frequency modulation instruction I for feedforward adjustment. And inputting the second frequency modulation instruction I into a valve characteristic curve of the valve to generate a first valve instruction control valve. And (3) the sum of the adjustment quantity of the first frequency modulation parameter E and the adjustment quantity of the load adjustment instruction D is differed with the unit load C to obtain a first frequency modulation instruction F. And inputting the first frequency modulation command F into a valve characteristic curve to generate a first valve command control valve. The valve command G adjusts the opening of the valve, and then controls the acting of the steam in the steam turbine, so as to control the power of a generator connected with the steam turbine, and further adjust the frequency of a power grid.
Optionally, fig. 10 is a schematic structural diagram of a frequency adjusting device of a nuclear power unit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 10, a frequency adjusting device 10 of a nuclear power unit according to an embodiment of the present invention includes:
the acquisition module 11 is used for acquiring core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit;
a calculation module 12, configured to determine a first frequency modulation parameter according to the core thermal power, the unit load range, and the frequency parameter of the power grid;
and the control module 13 is used for responding to the load adjustment instruction of the nuclear power unit and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter.
The frequency adjusting device of the nuclear power unit provided by the embodiment of the invention obtains the core thermal power of the nuclear power unit, the unit load parameter and the frequency parameter of the power grid. And determining a first frequency modulation parameter according to the core thermal power, the unit load range and the frequency parameter of the power grid. And responding to a load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter. According to the frequency adjusting device of the nuclear power unit, the first frequency modulation instruction is generated to adjust the frequency of the power grid through the obtained core thermal power of the nuclear power unit, the unit load parameters and the frequency parameters of the power grid, so that the rapid adjustment of the frequency of the power grid through primary frequency modulation of the nuclear power unit is realized, the requirement of small load of rapid lifting of the nuclear power unit is met, and the stable operation of the power grid is ensured.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of frequency adjustment for a nuclear power unit, comprising:
obtaining core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit, wherein the unit load parameters comprise a unit load range and a unit work load;
determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid;
and responding to the load adjusting instruction of the nuclear power unit, and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter.
2. The tuning method of claim 1, wherein the determining a first tuning parameter based on the core thermal power, a unit load range, and a frequency parameter of a power grid comprises:
determining an initial frequency adjustment amount of the power grid according to the target frequency of the power grid and the actual frequency of the power grid, wherein the frequency parameters of the power grid comprise the target frequency of the power grid and the actual frequency of the power grid;
and determining the first frequency modulation parameter according to the reactor core thermal power, the unit load range and the initial frequency adjustment quantity of the power grid.
3. The tuning method of claim 2, wherein the determining the first tuning parameter based on the core thermal power, a unit load range, and an initial frequency tuning amount of the power grid comprises:
comparing the initial frequency adjustment quantity of the power grid with the unit load range to obtain a first comparison result;
determining the first frequency modulation parameter according to the first comparison result;
comparing the sum of the core thermal power and the first frequency modulation parameter with the maximum value of the core thermal power to obtain a second comparison result;
and adjusting the first frequency modulation parameter according to the second comparison result.
4. The tuning method of claim 1, further comprising, after said determining a first tuning parameter based on said core thermal power, unit load range, and grid frequency parameters:
and generating a second frequency modulation instruction according to the first frequency modulation parameter and the unit work load.
5. The tuning method of claim 4, wherein generating a second tuning instruction based on the first tuning parameter and the unit workload comprises:
determining a preset adjustment quantity of the first frequency modulation parameter according to the unit work load;
and calculating a second frequency modulation instruction according to the product of the first frequency modulation parameter and the preset adjustment quantity.
6. The tuning method of claim 4, further comprising, after said generating a second tuning instruction based on said first tuning parameter and said unit workload:
and generating a first valve instruction according to the second frequency modulation instruction and the valve characteristic curve.
7. The tuning method of claim 1, further comprising, after said determining a first tuning parameter based on said core thermal power, unit load range, and grid frequency parameters:
and if the absolute value of the first frequency modulation parameter is larger than zero, adjusting the load change rate of the load adjusting instruction of the nuclear power unit to zero.
8. The tuning method of claim 1, wherein generating a first tuning command based on the unit workload and a first tuning parameter in response to the load adjustment command of the nuclear power unit comprises:
determining the load adjustment quantity of the nuclear power unit according to the load adjustment instruction of the nuclear power unit;
calculating a second frequency modulation parameter according to the sum of the load adjustment quantity of the nuclear motor unit and the first frequency modulation parameter;
determining the current load quantity of the nuclear power unit according to the unit work load;
and generating a first frequency modulation instruction according to the difference value between the second frequency modulation parameter and the current load capacity of the nuclear power unit.
9. The tuning method of claim 6, further comprising, after said generating a first tuning command in response to said load adjustment command for said nuclear power unit based on said unit workload and a first tuning parameter:
and determining a second valve instruction according to the first frequency modulation instruction and the valve characteristic curve.
10. A frequency adjustment device for a nuclear power unit, comprising:
the acquisition module is used for acquiring core thermal power, unit load parameters and frequency parameters of a power grid of the nuclear power unit;
the calculation module is used for determining a first frequency modulation parameter according to the reactor core thermal power, the unit load range and the frequency parameter of the power grid;
and the control module is used for responding to the load adjusting instruction of the nuclear power unit and generating a first frequency modulation instruction according to the unit work load and the first frequency modulation parameter.
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| CN202310610957.7A CN116599082A (en) | 2023-05-25 | 2023-05-25 | Frequency adjusting method and frequency adjusting device of nuclear power unit |
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| CN202310610957.7A CN116599082A (en) | 2023-05-25 | 2023-05-25 | Frequency adjusting method and frequency adjusting device of nuclear power unit |
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