CN112181035B - Segmented accurate control method for control current of nuclear power station driving mechanism - Google Patents
Segmented accurate control method for control current of nuclear power station driving mechanism Download PDFInfo
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Abstract
The invention discloses a segmented accurate control method for control current of a nuclear power station driving mechanism, which designs an independent control mode for each segmented time sequence state to perform segmented accurate control by analyzing the segmented state of the time sequence current and combining the characteristics of electrical parameters in a CRDM power supply loop of each stage, designs a linking method based on state advanced prejudgment for the time sequence change segmented transition stage, optimizes the time sequence current waveform and effectively improves the power supply quality of a driving mechanism power supply.
Description
Technical Field
The invention belongs to the technical field of nuclear power station control, and particularly relates to a sectional type accurate control method for control current of a nuclear power station driving mechanism, which is used for sectional accurate control of control current of a pressurized water reactor nuclear power station control rod driving mechanism.
Background
A rod control power supply cabinet (power supply cabinet for short) in a rod control position system of a nuclear power station provides time sequence current meeting the precision and the response speed of a coil of a Control Rod Driving Mechanism (CRDM) and controls actions of a CRDM armature and a hook, so that the CRDM armature and the hook operate normally. The timing current output from the power cabinet to the CRDM is divided into a boost timing current and an insertion timing current, and each timing current corresponds to three coils of the CRDM: the Lifting Coil (LC), the transfer coil (MC) and the holding coil (SC) supply power, thereby controlling the driving mechanism to complete mechanical action. In the timing current, LC has a large current 40A and a small current 16A, and MC and SC have a large current 8A and a small current 4.7A. The LC current is divided into in time series variation: 8 stages of zero current to large current, large current holding, large current to small current, small current holding, small current to zero current and the like; the MC current is divided in the time-series variation into: 6 stages of zero current to large current, large current holding, large current to small zero current and the like; the SC current is divided in the time-series variation into: zero current to large current, large current hold, large current to small zero current, small current hold, small current to large current, large current hold, small current to zero current, etc. 11 stages.
The power cabinet in the nuclear power plant all adopts single control and regulation mode for the control current that CRDM provided, and the control module of controlling several kinds of coil power supply major loop all adopts the closed loop mode of single mode promptly, does not carry out the adaptability dynamic adjustment of current control and regulation mode to each current change stage, consequently can appear that current waveform bulges, ripple are great, control when current step change phenomenon such as overshoot.
The quality of the time sequence current waveform directly relates to the stability and reliability of the long-term stable operation of the driving mechanism, and influences the service life of the CRDM to a certain extent.
Disclosure of Invention
In order to improve the power supply quality of a control rod driving mechanism power supply and optimize and control a time sequence current waveform, the invention provides a sectional type accurate control method for the control current of a nuclear power station driving mechanism.
The invention is realized by the following technical scheme:
a segmented accurate control method for control current of a nuclear power station driving mechanism comprises the following steps:
performing subsection time sequence state analysis on the time sequence current output to the control rod driving mechanism by the rod control power cabinet;
and each subsection time sequence state is accurately controlled in a subsection mode by adopting an independent control strategy.
Preferably, the segment precise control process of the present invention specifically includes:
judging the current time sequence current state output to the control rod driving mechanism by the rod control power cabinet:
if the current time sequence current state is in a stable state, judging that the current time sequence current state is a large current, small current or zero current state; if the current is in a zero-current state, the control is switched off completely under a zero-current steady state; if the current is in a large-current or small-current state, the current enters a control closed-loop feedback steady-state regulation under the large-current or small-current steady state;
if the current state of the current time sequence is in a transient state, judging the transient state change state of the current time sequence current; if the current is changed from zero current to large current or from small current to large current, the control is started to be fully switched on; if the current is in the state from large current to small current or from large current to zero current or from small current to zero current, the transient regulation of the control open loop is started; if the coil current reaches the large current preset range after the coil armature actuation is finished, the control loop feedback dynamic regulation is started; and if the output voltage is in a large-current steady state or a small-current steady state output state, the control closed-loop feedback steady state regulation is entered.
Preferably, the control full-off of the invention is specifically that the rod-controlled power supply cabinet turns off a power device in the main control loop through logic control, so that the current output by the power supply cabinet to the control rod drive mechanism coil is effectively turned off.
Preferably, the full-open control system is characterized in that the rod control power supply cabinet completely loads the power supply to the coil of the control rod driving mechanism by logically controlling the power device in the full-open main control loop, so that the current rising speed is maximum.
Preferably, the control open-loop transient regulation of the present invention specifically comprises: when the current changes suddenly, in order to avoid reverse voltage impact on a power device caused by overlarge reverse electromotive force, the rod-controlled power supply cabinet controls the speed of the current change of the coil by adopting a control open loop in a preset gradual duty ratio regulation mode.
Preferably, the control closed-loop feedback steady-state regulation specifically comprises: the rod-controlled power supply cabinet is controlled to be in closed-loop feedback steady-state PID regulation, and current is stabilized in a large-current, small-current or zero-current state.
Preferably, the control closed-loop feedback dynamic regulation of the present invention specifically comprises: the rod-controlled power supply cabinet intervenes in the closed-loop feedback dynamic PID regulation in advance through difference value prejudgment, and controls the current within a large-current preset range, so that the coil current can be stably transited to enter a stable state.
Preferably, the method of the present invention is used for analyzing and controlling the current timing sequence of the driving mechanism lifting coil LC in a segmented manner, and specifically comprises:
analyzing the time sequence current output to a control rod drive mechanism lifting coil LC by the rod control power cabinet, and obtaining the current time sequence state of the coil LC comprises the following steps: the first stage is a zero-current steady-state stage, the second stage and the third stage are a conversion stage from zero current to large current, the fourth stage is a large-current steady-state stage, the fifth stage is a conversion stage from large current to small current, the sixth stage is a small-current steady-state stage, the seventh stage is a conversion stage from small current to zero current, and the eighth stage is a zero-current steady-state stage;
a first stage and an eighth stage: adopting control full turn-off;
and a second stage: adopting control full opening;
and a third stage: closed loop feedback dynamic regulation is adopted;
fourth and sixth stages: adopting control closed loop feedback steady state regulation;
fifth and seventh stages: control open loop transient regulation is employed.
Preferably, the method of the present invention is used for analyzing and controlling the current timing sequence of the driving mechanism transfer coil MC in a segmented manner, and specifically comprises:
analyzing the current time sequence output from the rod control power cabinet to the control rod drive mechanism transmission coil MC, and obtaining the current time sequence state of the coil MC comprises the following steps: the first stage is a zero-current steady-state stage, the second stage and the third stage are a conversion stage from zero current to large current, the fourth stage is a large-current steady-state stage, the fifth stage is a conversion stage from large current to zero current, and the sixth stage is a zero-current steady-state stage;
a first stage and a sixth stage: adopting control full turn-off;
and a second stage: adopting control full opening;
and a third stage: adopting control closed loop feedback dynamic regulation;
a fourth stage: adopting control closed loop feedback steady state regulation;
the fifth stage: control open loop transient regulation is employed.
Preferably, the method of the present invention is used for analyzing and controlling the current timing of the driving mechanism holding coil SC in a segmented manner, and specifically includes:
analyzing the current time sequence output from the rod control power cabinet to the control rod drive mechanism holding coil SC, and obtaining the current time sequence state of the coil SC comprises the following steps: the first stage is a low-current steady-state stage, the second stage and the third stage are conversion stages from low current to high current, the fourth stage is a high-current steady-state stage, the fifth stage is a conversion stage from high current to zero current, the sixth stage is a zero-current steady-state stage, the seventh stage and the eighth stage are conversion stages from zero current to high current, the ninth stage is a high-current steady-state stage, the tenth stage is a conversion stage from high current to low current, and the eleventh stage is a low-current steady-state stage;
first and eleventh stages: adopting closed loop feedback steady state regulation;
second and seventh stages: adopting control full opening;
third stage and eighth stage: adopting control closed loop feedback dynamic regulation;
fourth and ninth stages: adopting control closed loop feedback steady state regulation;
fifth and tenth stages: adopting control open-loop transient regulation;
the sixth stage: and adopting control full turn-off.
The invention has the following advantages and beneficial effects:
according to the method, through the analysis of the segmented state of the time sequence current and the combination of the characteristics of the electrical parameters in the CRDM power supply loop of each stage, an independent control mode is designed for each segmented time sequence state to carry out segmented accurate control, a connection method based on state advanced prejudgment is designed for the time sequence change segmented transition stage, the time sequence current waveform is optimized, and therefore the power supply quality of the power supply of the driving mechanism is effectively improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a waveform illustrating a typical coil current timing for a control rod drive mechanism of the present invention.
FIG. 2 is a schematic sectional-type precise control flow diagram according to the present invention.
FIG. 3 is a schematic diagram of the LC coil current timing analysis and segment control according to the present invention.
FIG. 4 is a schematic diagram of MC coil current timing analysis and segment control according to the present invention.
FIG. 5 is a schematic diagram of the SC coil current timing analysis and segment control according to the present invention.
FIG. 6 is a graph of a CRDM current waveform prior to (i.e., not used in conjunction with) the use of the segmented precision control method of the present invention.
FIG. 7 is a graph of a CRDM current waveform after using the segmented precision control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a segmented accurate control method for control current of a driving mechanism of a nuclear power station. According to the control method, by analyzing the segmented state of the time sequence current and combining the characteristics of the electrical parameters in the CRDM power supply loop of each stage, an independent control mode is designed for each segmented time sequence state to carry out segmented accurate control, and a linking method based on state advanced prejudgment is designed for the time sequence change segmented transition stage, so that the time sequence current waveform is optimized, and the power supply quality of the power supply of the driving mechanism is effectively improved.
The control principle of the embodiment is as follows: in this embodiment, the power cabinet of the rod control system is firstly output to the CRDM, and the time sequence current for controlling the operation of the CRDM is analyzed in a segmented manner, where the main time sequence current continuous state is as follows: large current, small current, zero current; the main time sequence current change stages are: zero current to large current, zero current to small current, large current to small current, small current to large current, large current to zero current, and small current to zero current; the changes in the CRDM coil timing current correspond one-to-one to the actions of the CRDM armature and finger.
The large current and the small current in the embodiment are determined according to the time sequence current output requirement of the control rod driving mechanism action on the power supply control equipment.
A typical coil current timing waveform and CRDM armature and finger motion can be summarized as the current timing waveform shown in fig. 1 below.
As can be seen from fig. 1, the coil current is divided into a plurality of stages during the time sequence conversion process, and exhibits transition states and steady-state current waveforms of different states corresponding to the actions of the CRDM. According to the invention, through the analysis of the subsection time sequence state of the time sequence current output to the CRDM by the rod-controlled power cabinet, an independent control method is designed for each subsection time sequence, the current precision is improved, and meanwhile, the current transformation state in the transformation state is pre-judged in advance to ensure the stability of the control process.
Specifically, as shown in fig. 2, the sectional type precise control method for controlling current of the driving mechanism in this embodiment specifically includes:
firstly, judging the time sequence state of CRDM current, if the current is in a stable state, directly judging whether the current is large current, small current or zero current, controlling full turn-off under the zero current stable state, and pre-judging to intervene in advance to control closed loop feedback stable state regulation under the large current or small current stable state through difference values; if the current is in a transient state, the state of transient change of the current is directly judged, the control full opening is carried out under the state from zero to large or from small to large, the control open-loop feedback transient regulation is carried out under the state from large to small or from large to zero or from small to zero, and the control closed-loop feedback dynamic regulation is carried out at the stage from the initial action of the CRDM armature to the firm attraction.
By implementing the control method, the CRDM coil current segmentation accurate control is realized, and the current waveform is ensured to meet the accuracy requirement.
In the embodiment, the time sequence current of each coil (including an LC coil, an MC coil and an SC coil) of the control rod driving mechanism is controlled accurately in a sectional mode, and the specific process is as follows:
(1) for LC coil
The method comprises the steps of carrying out time sequence state segmentation analysis on the current waveform of the LC coil, wherein the initial stage is 0A zero current, the second stage and the third stage are 0A to large current 40A change stages, the fourth stage is a 40A large current steady-state stage, the fifth stage is a conversion stage from 40A large current to 16A small current, the sixth stage is a 16A small current steady-state stage, the seventh stage is a conversion stage from 16A small current to 0A zero current, and the eighth stage is a 0A zero current steady-state stage. The control mode adopted by each stage is shown in fig. 3.
As shown in fig. 3, in 8 stages of the LC coil current timing control, the control methods respectively adopted are as follows:
s1 and S8: and controlling to be completely turned off. The output of the current stage is LC zero current, and the bar-controlled power supply cabinet turns off a power device in the main control loop through logic control, so that the current output to the CRDM coil by the power supply cabinet is effectively turned off.
S2: and controlling full opening. The current stage is a change stage that the LC current rises from zero current to large current, and in order to ensure that the rising edge time of the current is short enough, the rod-controlled power supply cabinet completely loads a power supply onto the LC coil through the logic control of the power devices in the fully-open main control loop, so that the rising speed of the current is maximized.
S3: and controlling closed loop feedback dynamic regulation. The current stage is a stage from the LC current approaching a large current to the effective action completion of the LC armature, in order to avoid current overshoot caused by the rapid rise of the current in the full-open stage of S2, the current is controlled to be near the large current value by pre-judging the difference value to intervene in the closed-loop feedback dynamic PID regulation in advance before the connection stage of S2 and S3, namely the S3 stage. After the stable transition enters the stage of S3, the LC armature continues to carry load action under the high-current steady state (the armature is pressed from the beginning of attraction to the completion), and the gap change caused by the action of the LC armature causes the inductance change in the loop, so that the loop parameter which continuously adapts to the change is regulated by closed-loop feedback dynamic PID in the whole work-doing process of the load action, and the current is controlled within the precision range of the high-current value. Effective attraction action of the LC armature is realized in the S2 and S3 stages, the action time is T1 (starting from a change point from zero current to large current, the attraction action of the LC armature is firm as an end point), the current rise time is ensured to be fast enough in the S2 stage, and the LC armature is effectively attracted with load and stable in current in the S3 stage.
S4: and controlling closed-loop feedback steady-state regulation. In the stage, the LC armature iron finishes the action and is firmly attracted, and the control process is switched from the loaded motion to the loaded steady state work. At the moment, the inductance in the loop is stable, so the power supply cabinet control should be switched into closed loop feedback stable PID regulation to stabilize the current within the precision range of the large current value.
S5: controlling open loop transient regulation. The phase is a sudden change phase from large LC current to small LC current. To ensure that the falling edge time from large current to small current is sufficiently short, a control full off must be used. However, the sudden drop of current will cause a large back electromotive force on the inductive load, such as an LC coil, and if the sudden drop of current is not controlled, a current bulge will occur when a large LC current is converted into a small current. Therefore, the speed of converting the large LC current into the small LC current is controlled by adopting the control open loop in a certain gradual change type duty ratio adjusting mode, so that the reverse electromotive force in the LC coil is low enough, and the current bulge phenomenon is avoided.
S6: the S6 and S4 phases are similar, and after the current mutation is completed, the closed-loop feedback steady-state regulation phase is entered.
S7: in the same way in the stages S7 and S5, when the current suddenly changes, in order to avoid the reverse voltage impact on the power device caused by the excessive reverse electromotive force, the speed of the LC low current to zero current transition is controlled by a control open loop in a certain gradual duty ratio adjustment mode. The stages S7 and S8 realize the effective release action of the LC armature, the action time is T2 (the starting point is the change point from small current to zero current, and the end point is the complete release of the LC armature), the stage S7 ensures that the current fall time is fast enough, and the stage S8 ensures that the current is zero, thereby realizing the rapid release of the LC armature.
(2) For MC coil
And performing sequential state segmentation analysis on the current waveform of the MC coil, wherein the initial stage is 0A zero current, the second stage and the third stage are 0A to large current 8A change stages, the fourth stage is an 8A large current steady-state stage, the fifth stage is a conversion stage from 8A large current to 0A zero current, and the sixth stage is a 0A zero current steady-state stage. The control mode adopted in each stage is shown in fig. 4.
As shown in fig. 4, in 6 stages of MC coil current timing control, the control methods respectively adopted are as follows:
s1 and S6: and controlling to be completely turned off. The output of the current stage is MC zero current, and the bar-controlled power supply cabinet turns off a power device in the main control loop through logic control, so that the current output to the CRDM coil by the power supply cabinet is effectively turned off.
S2: and controlling full opening. The current phase is a change phase that the MC current rises from zero current to large current, and in order to ensure that the rising edge time of the current is short enough, the rod control power supply cabinet completely loads a power supply on the MC coil by logically controlling power devices in the full-on main control loop, so that the rising speed of the current is maximized. After the time T1, the MC armature starts to pull in action, and T2 is the time from the moment that the MC armature just starts to pull in to the moment that the MC armature completely pulls in and presses tightly.
S3: and controlling closed loop feedback dynamic regulation. The current stage is a stage in which the whole action process of the MC armature starts to act and the current is close to the large current, in order to avoid current overshoot caused by rapid rise of the current in the S2 full-open-circuit stage, the current is subjected to closed-loop feedback dynamic PID regulation in advance through difference value pre-judgment before the connection stage of the S2 and S3 stages, namely the S3 stage, and the stable transition of the current from the action point groove to the vicinity of the large current value is ensured. After the stage of S3, the MC armature continues to carry load action under the high-current steady state (the armature is from attraction to complete compression), and the gap of the MC armature changes due to the action to cause the inductance change in the loop, so that the loop parameters which continuously adapt to the change are regulated by closed-loop feedback dynamic PID in the whole work-doing process of the load action, the current is quickly restored to the high current, and the current is controlled within the precision range of the high current value.
S4: and controlling closed-loop feedback steady-state regulation. At the stage, the MC armature finishes the action and is firmly attracted, and the control process is switched from the loaded motion to the loaded steady state work. At the moment, the inductance in the loop is stable, so the power supply cabinet control should be switched into closed loop feedback stable PID regulation to stabilize the current within the precision range of the large current value.
S5: controlling open loop transient regulation. When the current suddenly changes, in order to avoid the reverse voltage impact on the power device caused by the overlarge reverse electromotive force, the speed of the MC large current to zero current conversion is controlled by adopting a control open loop in a certain gradual change type duty ratio regulation mode. Effective release action of the MC armature is realized at the stages of S5 and S6, wherein the action time T3 takes a change point from large current to zero current as a starting point, and takes the end point that the MC armature just starts to release after the large current is reduced to a certain value; the actuation time T4 is the time from when the MC armature just started to when the actuation was completed. The stage S5 ensures that the current fall time is fast enough, and the stage S6 ensures that the current is zero, thereby achieving rapid release of the MC armature.
(3) For SC coil
The SC coil current waveform is subjected to sequential state segmentation analysis, the initial stage is a 4.7A low current, the second stage and the third stage are a stage from the low current 4.7A to the high current 8A, the fourth stage is an 8A high current stable stage, the fifth stage is a stage from the high current 8A to the zero current 0A, the sixth stage is a 0A zero current stable stage, the seventh stage and the eighth stage are a stage from the zero current 0A to the high current 8A, the ninth stage is an 8A high current stable stage, the tenth stage is a stage from the high current 8A to the low current 4.7A, and the eleventh stage is a 4.7A low current stable stage. The control mode adopted in each stage is shown in fig. 5.
As shown in fig. 5, in 6 stages of MC coil current timing control, the control methods respectively adopted are as follows:
s1 and S11: and controlling closed-loop feedback steady-state regulation. The output of the current stage is SC low current, the power supply cabinet is controlled to be in closed loop feedback stable PID regulation, and the current is stabilized within the precision range of the low current value.
S2: and controlling full opening. The current stage is a change stage that the SC current rises from zero current to large current, and in order to ensure that the rising edge time of the current is short enough, the rod-controlled power supply cabinet completely loads a power supply on the SC coil by logically controlling a power device in a full-on main control loop, so that the rising speed of the current is maximized. In the process, the SC armature is already in an attraction state and does not generate mechanical action.
S3: and controlling closed loop feedback dynamic regulation. The current stage is a stage in which the current of the SC coil is close to a large current, and the control needs to intervene in closed loop feedback dynamic PID regulation in advance through difference value pre-judgment before the stage S3 comes, so that current overshoot caused by rapid rise of the current in the full-open stage S2 is avoided.
S4: and controlling closed-loop feedback steady-state regulation. In the stage, the power supply cabinet control is switched into closed-loop feedback steady-state PID regulation, so that the current is stabilized within the precision range of a large current value.
S5: controlling open loop transient regulation. When the current suddenly changes, in order to avoid the reverse voltage impact on the power device caused by the overlarge back electromotive force, the open loop is controlled to control the conversion speed of the SC large current to the zero current in a certain gradual change type duty ratio regulation mode. Effective release action of the SC armature is realized at the stages of S5 and S6, wherein the action time T1 takes a change point from large current to zero current as a starting point, and takes the end point that the SC armature just starts to release after the large current is reduced to a certain value; action time T2 is when the SC armature has just started to complete. The stage S5 ensures that the current fall time is fast enough, and the stage S6 ensures that the current is zero, thereby achieving a quick release of the SC armature.
S6: and controlling to be completely turned off. This phase ensures that the SC coil current is 0A.
S7: and controlling full opening. The current stage is a change stage that the SC current rises from zero current to large current, and in order to ensure that the rising edge time of the current is short enough, the rod-controlled power supply cabinet completely loads a power supply on the SC coil by logically controlling a power device in a full-on main control loop, so that the rising speed of the current is maximized. After the time T3, the SC armature starts to pull in, and T4 is the time from the SC armature just starting to pull in to the time of complete pull-in and pressing.
S8: and controlling closed loop feedback dynamic regulation. The current stage is a stage in which the whole action process of the SC armature starts to act and the current is close to the large current, in order to avoid current overshoot caused by the rapid rise of the current in the S7 full-open-circuit stage, the current is subjected to closed-loop feedback dynamic PID regulation in advance through difference value pre-judgment before the connection stage of the S7 and S8 stages, namely the S8 stage, and the smooth transition of the current from the action point groove to the vicinity of the large current value is ensured. After the stage S8, the SC armature continues to carry load action (the armature is pressed from the beginning of attracting to the complete), because the action of the SC armature causes the gap change and the inductance change in the loop, the loop parameter which is adapted to change continuously should be adjusted by closed loop feedback dynamic PID in the whole working process of carrying load action, the current is restored to the large current rapidly, and the current is controlled in the precision range of the large current value.
S9: and controlling closed-loop feedback steady-state regulation. At the stage, the SC armature iron finishes the action and is firmly attracted, and the control process is switched from the loaded motion to the loaded steady state work. At the moment, the inductance in the loop is stable, so the power supply cabinet control should be switched into closed loop feedback stable PID regulation to stabilize the current within the precision range of the large current value.
S10: controlling open loop transient regulation. The phase is a sudden change phase from a large current to a small current of the SC. To ensure that the falling edge time from large current to small current is sufficiently short, a control full off must be used. However, the sudden drop of current causes a large back electromotive force on an inductive load such as an SC coil, and if the sudden drop speed of current is not controlled, a current bulge phenomenon occurs when a large SC current is converted into a small SC current. Therefore, the open loop is controlled to control the conversion speed of the SC high current to the low current in a certain gradual change type duty ratio regulation mode, so that the back electromotive force in the SC coil is low enough, and the current bulge phenomenon is avoided.
Example 2
This example tests the control method proposed in example 1 above.
The CRDM power waveform before the control scheme described in embodiment 1 above is not used is shown in fig. 6.
As can be seen from fig. 6, the current waveform ripple of the CRDM is large before the control method described in embodiment 1 above is used, and the current overshoot phenomenon occurs on the current waveform large current stage; the current waveform has a current bulge phenomenon when the large current of the lifting coil LC and the holding coil SC is converted into the small current. These abnormal fluctuations in the waveform will affect both the CRDM life and the normal operation of the plant.
The CRDM power waveform after using the control method described in embodiment 1 above is shown in fig. 7.
As can be seen from fig. 7, after the control method described in embodiment 1 is adopted, the ripple of the current waveform of the CRDM is small, the current waveform is smooth, and the current waveform has no abnormal bulge, which is more beneficial to the stable operation of the CRDM.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A segmented accurate control method for control current of a nuclear power station driving mechanism is characterized by comprising the following steps:
performing subsection time sequence state analysis on the time sequence current output to the control rod driving mechanism by the rod control power cabinet;
each subsection time sequence state adopts an independent control strategy to carry out subsection accurate control; the segmented accurate control process specifically comprises the following steps:
judging the current time sequence current state output to the control rod driving mechanism by the rod control power cabinet:
if the current time sequence current state is in a stable state, judging that the current time sequence current state is a large current, small current or zero current state; if the current is in a zero-current state, the control is switched off completely under a zero-current steady state; if the current is in a large-current or small-current state, the current enters a control closed-loop feedback steady-state regulation under the large-current or small-current steady state;
if the current state of the current time sequence is in a transient state, judging the transient state change state of the current time sequence current; if the current is changed from zero current to large current or from small current to large current, the control is started to be fully switched on; if the current is in the state from large current to small current or from large current to zero current or from small current to zero current, the transient regulation of the control open loop is started; if the coil current reaches the large current preset range after the coil armature actuation is finished, the control loop feedback dynamic regulation is started; and if the output voltage is in a large-current steady state or a small-current steady state output state, the control closed-loop feedback steady state regulation is entered.
2. The segmented precise control method for the control current of the nuclear power plant driving mechanism is characterized in that the full control switch-off is realized by switching off a power device in a main control loop through logic control by a rod control power cabinet, so that the current output by the power cabinet to a control rod driving mechanism coil is effectively switched off.
3. The segmented precise control method for the control current of the driving mechanism of the nuclear power plant as claimed in claim 1, wherein the control full-on power supply cabinet is used for completely loading a power supply to a coil of the control rod driving mechanism by logically controlling a power device in a full-on main control loop, so that the current rising speed is maximum.
4. The segmented precise control method for the control current of the driving mechanism of the nuclear power plant as claimed in claim 1, wherein the control open-loop transient regulation is specifically as follows: when the current changes suddenly, in order to avoid reverse voltage impact on a power device caused by overlarge reverse electromotive force, the rod-controlled power supply cabinet controls the speed of the current change of the coil by adopting a control open loop in a preset gradual duty ratio regulation mode.
5. The segmented precise control method for the control current of the nuclear power plant driving mechanism according to claim 1, wherein the control closed-loop feedback steady-state regulation is specifically as follows: the rod-controlled power supply cabinet is controlled to be in closed-loop feedback steady-state PID regulation, and current is stabilized in a large-current, small-current or zero-current state.
6. The segmented precise control method for the control current of the nuclear power plant driving mechanism according to claim 1, wherein the dynamic regulation of the control closed-loop feedback specifically comprises: the rod-controlled power supply cabinet intervenes in the closed-loop feedback dynamic PID regulation in advance through difference value prejudgment, and controls the current within a large-current preset range, so that the coil current can be stably transited to enter a stable state.
7. The segmented precise control method for the control current of the driving mechanism of the nuclear power plant as claimed in any one of claims 1 to 6, wherein the method is used for analyzing and controlling the current time sequence of the lifting coil LC of the driving mechanism in a segmented manner, and comprises the following steps:
analyzing the time sequence current output to a control rod drive mechanism lifting coil LC by the rod control power cabinet, and obtaining the current time sequence state of the coil LC comprises the following steps: the first stage is a zero-current steady-state stage, the second stage and the third stage are a conversion stage from zero current to large current, the fourth stage is a large-current steady-state stage, the fifth stage is a conversion stage from large current to small current, the sixth stage is a small-current steady-state stage, the seventh stage is a conversion stage from small current to zero current, and the eighth stage is a zero-current steady-state stage;
a first stage and an eighth stage: adopting control full turn-off;
and a second stage: adopting control full opening;
and a third stage: closed loop feedback dynamic regulation is adopted;
fourth and sixth stages: adopting control closed loop feedback steady state regulation;
fifth and seventh stages: control open loop transient regulation is employed.
8. The segmented precise control method for the control current of the driving mechanism of the nuclear power plant as claimed in any one of claims 1 to 6, wherein the method is used for analyzing and controlling the current timing of the driving mechanism transmission coil MC in a segmented manner, and comprises the following steps:
analyzing the current time sequence output from the rod control power cabinet to the control rod drive mechanism transmission coil MC, and obtaining the current time sequence state of the coil MC comprises the following steps: the first stage is a zero-current steady-state stage, the second stage and the third stage are a conversion stage from zero current to large current, the fourth stage is a large-current steady-state stage, the fifth stage is a conversion stage from large current to zero current, and the sixth stage is a zero-current steady-state stage;
a first stage and a sixth stage: adopting control full turn-off;
and a second stage: adopting control full opening;
and a third stage: adopting control closed loop feedback dynamic regulation;
a fourth stage: adopting control closed loop feedback steady state regulation;
the fifth stage: control open loop transient regulation is employed.
9. The segmented precise control method for the control current of the driving mechanism of the nuclear power plant as claimed in any one of claims 1 to 6, wherein the method is used for analyzing and controlling the current timing of the driving mechanism holding coil SC in a segmented manner, and comprises the following steps:
analyzing the current time sequence output from the rod control power cabinet to the control rod drive mechanism holding coil SC, and obtaining the current time sequence state of the coil SC comprises the following steps: the first stage is a low-current steady-state stage, the second stage and the third stage are conversion stages from low current to high current, the fourth stage is a high-current steady-state stage, the fifth stage is a conversion stage from high current to zero current, the sixth stage is a zero-current steady-state stage, the seventh stage and the eighth stage are conversion stages from zero current to high current, the ninth stage is a high-current steady-state stage, the tenth stage is a conversion stage from high current to low current, and the eleventh stage is a low-current steady-state stage;
first and eleventh stages: adopting closed loop feedback steady state regulation;
second and seventh stages: adopting control full opening;
third stage and eighth stage: adopting control closed loop feedback dynamic regulation;
fourth and ninth stages: adopting control closed loop feedback steady state regulation;
fifth and tenth stages: adopting control open-loop transient regulation;
the sixth stage: and adopting control full turn-off.
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| US5949668A (en) * | 1997-03-10 | 1999-09-07 | Siemens Aktiengesellschaft | Power amplifier with multiple switched output stages, and method and driver for operating same |
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| US5949668A (en) * | 1997-03-10 | 1999-09-07 | Siemens Aktiengesellschaft | Power amplifier with multiple switched output stages, and method and driver for operating same |
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