CN116260195A - Method for preventing primary frequency modulation from causing reactor overpower for nuclear power station - Google Patents
Method for preventing primary frequency modulation from causing reactor overpower for nuclear power station Download PDFInfo
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- CN116260195A CN116260195A CN202211683027.6A CN202211683027A CN116260195A CN 116260195 A CN116260195 A CN 116260195A CN 202211683027 A CN202211683027 A CN 202211683027A CN 116260195 A CN116260195 A CN 116260195A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to the technical field of control of a steam turbine generator unit of a nuclear power station, and particularly relates to a method for preventing primary frequency modulation from causing reactor overpower for the nuclear power station, which comprises the following steps: step one, acquiring a current nuclear power measured value of a reactor and acquiring an allowable nuclear power set value; calculating the power deviation between the nuclear power measured value and the allowable nuclear power set value, and judging the calculated power deviation value by using a reactor power controller to generate an allowable nuclear power overrun signal; and thirdly, simultaneously sending an overrun signal of the allowable nuclear power and the allowable electric power to a turbine power regulation controller, and locking primary frequency regulation by the controller after the overrun signal is triggered. The method of the invention reforms the control logic of the current primary frequency modulation, and increases the locking condition of the primary frequency modulation of the steam turbine generator unit so as to prevent the nuclear power from exceeding the limit and ensure the safe operation of the reactor.
Description
Technical Field
The invention belongs to the technical field of control of a steam turbine generator unit of a nuclear power station, and particularly relates to a method for preventing primary frequency modulation from causing reactor overpower for the nuclear power station.
Background
The capacity of a nuclear power unit in the current power grid is continuously increased, and the nuclear power unit is imperative to participate in primary frequency modulation of the power grid. Because the nuclear power unit is often used as the base load of the power grid, the nuclear power unit is not specially logically designed according to the primary frequency modulation requirement of the power grid at the beginning of the birth of the nuclear power unit. There is currently a common risk of reactor overpower operation due to unit up-regulation. The over-power operation of the reactor severely threatens the safety of the fuel elements and may cause melting damage to the fuel rods and fuel cladding. The control logic of primary frequency modulation in the current unit turbine power regulation controller adopts "allowable electric power" as a blocking condition of primary frequency modulation (i.e. when the turbine reaches allowable electric power operation, the unit no longer has the capability of upward regulation).
When the unit works in summer working condition or the efficiency of the steam turbine generator changes, or the corresponding relation between the nuclear power and the electric power of the unit changes due to technical transformation of the unit, which affects the power or the efficiency of the steam turbine, the unit has the condition that the nuclear power reaches the 'allowed nuclear power' but the electric power does not reach the 'allowed electric power'. According to the current logic, the unit still has the capability of upward adjustment at this time. If the primary tuning action increases the generator output at this time, the turbine main tuning gate will be opened and the main steam header pressure will decrease, which will result in a decrease in the coolant temperature of the reactor cold leg, which will introduce positive reactivity into the reactor, which will lead to an increase in reactor power, due to the negative moderator temperature coefficient of the pressurized water reactor. The temperature coefficient of the moderator is more negative at the end of the service life, the reactivity change introduced by the same temperature change is larger, the fluctuation range of the reactor power is correspondingly increased, and the condition that the primary frequency modulation action causes the reactor to overpower can occur at the moment.
Therefore, a control method for preventing the reactor from overpower during primary frequency modulation of the turbo generator set needs to be studied to solve the defects in the prior art.
Disclosure of Invention
The invention aims to provide a method for preventing the nuclear power station from exceeding the power of a reactor caused by primary frequency modulation.
The technical scheme for realizing the purpose of the invention comprises the following steps:
a method for preventing primary frequency modulation from causing reactor overpower for a nuclear power plant, the method comprising:
step one, acquiring a current nuclear power measured value of a reactor and acquiring an allowable nuclear power set value;
calculating the power deviation between the nuclear power measured value and the allowable nuclear power set value, and judging the calculated power deviation value by using a reactor power controller to generate an allowable nuclear power overrun signal;
and thirdly, simultaneously sending an overrun signal of the allowable nuclear power and the allowable electric power to a turbine power regulation controller, and locking primary frequency regulation by the controller after the overrun signal is triggered.
The generating of the allowable core power overrun signal in the second step specifically includes: sending the calculated power deviation value to an analog quantity limiting value module, and generating an allowable core power overrun signal after judging that the value is greater than 0;
the second step further comprises the following steps: in consideration of signal redundancy, generating allowable core power overrun signals of a plurality of channels according to the first step to the second step, and generating total allowable core power overrun signals after taking X module logic vote through the switching value Y;
in the third step, the nuclear power overrun allowing signal is sent to the turbine power adjusting controller specifically: the total allowable nuclear power overrun signal is output to the turbine power conditioning controller via the output module via hard-wired communication.
After the overrun signal in the third step is triggered, the controller locks the primary frequency modulation to adjust upwards specifically as follows: after receiving the total allowable nuclear power overrun signal, the steam turbine power regulating controller latches the deviation output value of the current primary frequency modulation, and the latched value is sent to a primary frequency modulation limiting setting module to serve as an output upper limit so as to limit the capability of upward regulation of the primary frequency modulation.
The beneficial technical effects of the invention are as follows:
the invention relates to a control method for preventing the overpower of a reactor during the primary frequency modulation action of a steam turbine generator unit. When the efficiency of the turbo generator changes or the corresponding relation between the reactor power and the generator power changes due to other reasons, even if the control deviation of the primary frequency modulation controller increases, the primary frequency modulation controller should not be adjusted upwards when the unit is required to be loaded, so that the nuclear power can be prevented from exceeding the allowable value, and the downward adjustment of the primary frequency modulation time set can be ensured not to be influenced after the logic transformation.
Drawings
FIG. 1 is a schematic diagram of primary frequency modulation control logic of a current unit;
FIG. 2 is a schematic diagram of the relationship between a reactor power controller and a turbine power controller;
fig. 3 is a control schematic diagram for preventing the reactor from overpower during the primary frequency modulation of the turbo generator set of the nuclear power station.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The primary frequency modulation logic adopts 'allowable electric power' as a locking condition, but the nuclear power and the electric power of the unit are not strictly corresponding, and the reason is that the efficiency of the turbo generator unit is changed. Therefore, when using "allowable electric power" as the primary frequency modulation blocking condition, the foregoing problems exist, so in order to ensure the nuclear safety, whether the unit has the capability of up-frequency modulation should consider the "allowable nuclear power" of the reactor at the same time, and in order to perform the study of the logic improvement method, the method for preventing the primary frequency modulation from causing the super power of the reactor is implemented in the nuclear power station of the invention, which comprises the following steps:
step one, acquiring a current nuclear power measured value of a reactor and acquiring an allowable nuclear power set value;
calculating the power deviation between the nuclear power measured value and the allowable nuclear power set value, and judging the calculated power deviation value by using a reactor power controller to generate an allowable nuclear power overrun signal;
and thirdly, simultaneously sending an overrun signal of the allowable nuclear power and the allowable electric power to a turbine power regulation controller, and locking primary frequency regulation by the controller after the overrun signal is triggered.
As shown in fig. 2, the process system includes a reactor, control rods, coolant pumps or fans, steam generators, main turnstiles, turbo-generators and main steam supply systems, main feedwater supply systems, and the like. The associated control loop includes a reactor power controller, a turbine power controller.
As shown in fig. 3, the turbine power controller adopts the allowable electric power and the allowable nuclear power as the locking condition of the primary frequency modulation action logic, namely, when the turbine unit reaches the allowable electric power or the reactor reaches the allowable nuclear power, the unit is not regulated upwards any more.
Specifically, the control method for preventing the reactor from overpower during primary frequency modulation action of the steam turbine generator unit of the nuclear power station comprises the following steps:
step one, acquiring a current nuclear power measured value and acquiring a set value of allowed nuclear power;
calculating the deviation between the measured nuclear power measured value and the allowed nuclear power set value, sending the calculated power deviation value to an analog quantity limit value module, and generating an allowed nuclear power overrun signal after judging that the value is greater than 0;
in consideration of signal redundancy, generating allowable core power overrun signals of a plurality of channels according to the first step to the second step, and generating total allowable core power overrun signals after logically voting by a switching value Y X taking module (4 takes 2);
step three, the total allowable nuclear power overrun signal is output to a turbine power regulation controller through hard-wire communication by an output module;
after receiving the total allowable nuclear power overrun signal, the steam turbine power regulating controller latches the deviation output value of the current primary frequency modulation, and the latched value is sent to a primary frequency modulation limiting setting module to serve as an output upper limit so as to limit the capability of upward regulation of the primary frequency modulation.
Example 1
In this embodiment, a VVER pressurized water reactor nuclear generator set is taken as an example, and the process system includes a reactor, a control rod, a coolant pump or fan, a steam generator, a main valve, a turbo generator, a main steam supply system, and a main water supply system; the associated control loop includes a reactor power controller, a turbine power controller.
The reactor power controller controls the control rod set according to the stack power deviation or the main steam pressure deviation to control the reactor power. In controlling the reactor power in accordance with the main steam pressure deviation, the regulated quantity is the two-circuit main steam header pressure, and the control signal of the reactor power is derived from the deviation between the current main steam header pressure and the set point in order to maintain the main steam pressure at the set point. The turbine adjustment controller adjusts the steam flow of the turbine according to the electric power deviation signal at the moment so as to control the power of the generator.
During normal operation of the reactor, a current nuclear power measured value and an allowable nuclear power set value are obtained, the power deviation between the measured nuclear power measured value and the allowable nuclear power set value is calculated, then the calculated power deviation value is sent to an analog quantity limit value module, and after the value is judged to be larger than 0, an allowable nuclear power overrun signal is generated; generating an allowable core power overrun signal of a plurality of channels by considering signal redundancy, voting by a switching value Y X-taking module (4X 2), and generating a total allowable core power overrun signal; the method comprises the steps that a total allowable nuclear power overrun signal is output to a turbine power adjusting controller through hard wire communication by an output module, after the turbine power adjusting controller receives the total allowable nuclear power overrun signal, a current output value of primary frequency modulation is latched and used as the upper limit of a primary frequency modulation limiting setting module, so that even if the output value of a subsequent primary frequency modulation is increased, the logical limit is limited, the up-regulation cannot be carried out until the nuclear power overrun signal disappears, and meanwhile, the downward regulation capability of a unit can be guaranteed not to be influenced.
Compared with the original primary frequency modulation control method, after the efficiency of the turbine generator of the unit is changed or the electric power or the turbine efficiency is influenced by other technical transformation of the unit, when the nuclear power reaches the allowable power and the electric power does not reach the allowable power, even if the deviation output of the primary frequency modulation is increased, the amplitude limiting logic acts, and the primary frequency modulation upward regulation action is blocked at the moment.
The present invention has been described in detail with reference to the drawings and the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The invention may be practiced otherwise than as specifically described.
Claims (5)
1. A method for preventing primary frequency modulation from causing reactor overpower for a nuclear power plant, the method comprising:
step one, acquiring a current nuclear power measured value of a reactor and acquiring an allowable nuclear power set value;
calculating the power deviation between the nuclear power measured value and the allowable nuclear power set value, and judging the calculated power deviation value by using a reactor power controller to generate an allowable nuclear power overrun signal;
and thirdly, simultaneously sending an overrun signal of the allowable nuclear power and the allowable electric power to a turbine power regulation controller, and locking primary frequency regulation by the controller after the overrun signal is triggered.
2. The method for preventing primary frequency modulation from causing reactor overpower according to claim 1, wherein the generating the allowable nuclear power overpower signal in the second step specifically comprises: and sending the calculated power deviation value to an analog quantity limiting value module, and generating an allowable core power overrun signal after judging that the value is greater than 0.
3. A method for preventing primary frequency modulation from causing reactor overpower according to claim 2, further comprising, after said step two: and (3) considering signal redundancy, generating allowable core power overrun signals of a plurality of channels according to the first step to the second step, and generating a total allowable core power overrun signal after taking the logic vote of the X module through the switching value Y.
4. A method for preventing primary frequency modulation from causing reactor overpower according to claim 3, wherein in said step three, the transmission of the nuclear power overpower signal to the turbine power conditioning controller is allowed specifically: the total allowable nuclear power overrun signal is output to the turbine power conditioning controller via the output module via hard-wired communication.
5. The method for preventing primary frequency modulation from causing reactor overpower as claimed in claim 4, wherein after the triggering of the overrun signal in the third step, the controller locks the primary frequency modulation to adjust upwards specifically: after receiving the total allowable nuclear power overrun signal, the steam turbine power regulating controller latches the deviation output value of the current primary frequency modulation, and the latched value is sent to a primary frequency modulation limiting setting module to serve as an output upper limit so as to limit the capability of upward regulation of the primary frequency modulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211683027.6A CN116260195A (en) | 2022-12-27 | 2022-12-27 | Method for preventing primary frequency modulation from causing reactor overpower for nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211683027.6A CN116260195A (en) | 2022-12-27 | 2022-12-27 | Method for preventing primary frequency modulation from causing reactor overpower for nuclear power station |
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| CN202211683027.6A Pending CN116260195A (en) | 2022-12-27 | 2022-12-27 | Method for preventing primary frequency modulation from causing reactor overpower for nuclear power station |
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