CN116865356A - Method, device and medium for optimizing primary frequency modulation power response performance - Google Patents
Method, device and medium for optimizing primary frequency modulation power response performance Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 71
- 238000005728 strengthening Methods 0.000 claims abstract description 38
- 230000005764 inhibitory process Effects 0.000 claims abstract description 9
- 230000000670 limiting effect Effects 0.000 claims description 71
- 230000001629 suppression Effects 0.000 claims description 48
- 230000000630 rising effect Effects 0.000 claims description 28
- 238000005457 optimization Methods 0.000 claims description 25
- 238000004590 computer program Methods 0.000 claims description 16
- 230000004927 fusion Effects 0.000 claims description 15
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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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- Control Of Turbines (AREA)
Abstract
The application discloses a method, a device and a medium for optimizing primary frequency modulation power response performance, which comprise the steps of adding the output of a spontaneous fluctuation cancellation inhibition link into a total valve instruction to optimize the primary frequency modulation power response performance, adding the output of a primary frequency modulation strengthening link into the total valve instruction after gain of the primary frequency modulation strengthening link is K times, adding the primary frequency modulation strengthening link output serving as a frequency modulation target value and a load set value to obtain a controller set value, calculating a load difference value between the controller set value and input load feedback, taking the load difference value as input of a main control or power closed-loop control of a steam turbine of a thermal power unit, and adding the output of the main control or the power closed-loop control of the steam turbine of the thermal power unit into the total valve instruction. The application aims to inhibit adverse effect of spontaneous fluctuation on primary frequency modulation performance of the thermal power unit, so that the thermal power unit has better primary frequency modulation power response performance.
Description
Technical Field
The application relates to the technical field of primary frequency modulation of thermal power units, in particular to a method, a device and a medium for optimizing primary frequency modulation power response performance.
Background
The primary frequency modulation performance of the thermal power generating unit influences the frequency control capability and primary frequency modulation electric quantity assessment of the power grid. When the power grid normally operates, the fluctuation amplitude of the grid frequency is smaller, and the frequency modulation load target value corresponding to the primary frequency modulation action is correspondingly smaller. The spontaneous fluctuation of the load and the main steam pressure of the thermal power generating unit influences the primary frequency modulation load response capability, and the influence has randomness, and when the spontaneous fluctuation is the same as the frequency modulation target direction, the actual frequency modulation load response has higher probability to meet the performance requirement, so that the electric quantity assessment caused by unqualified performance is avoided; when spontaneous fluctuation is opposite to the frequency modulation target direction, the response capability of the actual frequency modulation load is weakened, so that the electric quantity assessment caused by the performance problem is more likely to occur.
At present, a conventional primary frequency modulation control strategy of the thermal power generating unit generally adopts a feedforward-feedback control strategy, and the influence of load, especially spontaneous fluctuation of main steam pressure, on primary frequency modulation response characteristics is less considered in the typical design. In order to effectively improve the primary frequency modulation performance of the thermal power generating unit under the normal running condition of the power grid, the primary frequency modulation control strategy of the thermal power generating unit needs to be optimized aiming at the spontaneous fluctuation influence of load and main steam pressure.
Disclosure of Invention
The application aims to solve the technical problems: aiming at the problems in the prior art, the application provides a method, a device and a medium for optimizing primary frequency modulation power response performance, which aim to inhibit adverse effects of spontaneous fluctuation on the primary frequency modulation performance of a thermal power unit, so that the thermal power unit has better primary frequency modulation power response performance.
In order to solve the technical problems, the application adopts the following technical scheme:
the method for optimizing the response performance of the primary frequency modulation power comprises the step of adding the output of a spontaneous fluctuation cancellation inhibition link to a total valve instruction to optimize the response performance of the primary frequency modulation power, wherein the step of generating the output by the spontaneous fluctuation cancellation inhibition link comprises the following steps: after the power grid frequency or the unit rotating speed passes over the primary frequency modulation dead zone, the main steam pressure p at the moment is locked T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; and taking the output of the speed limiting link as the output of the spontaneous fluctuation counteracting and inhibiting link.
Optionally, the calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
Optionally, the preset smaller values are all 0, and the preset larger values are all 100.
Optionally, the method further includes adding the output of the primary frequency modulation strengthening link to the total valve instruction after gain K times of the gain link to achieve optimization of primary frequency modulation power response performance, wherein the primary frequency modulation strengthening link generates the output including: forming an original frequency modulation target value by a rotational speed unequal rate link of a power grid frequency or unit rotational speed signal; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening link, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening link.
Optionally, the step of multiplying the output of the primary frequency modulation strengthening link by K times through the gain link means that the output of the primary frequency modulation strengthening link is multiplied by 1 time through the gain link.
Optionally, the preset smaller values are all 0, and the preset larger values are all 100.
Optionally, when the second intermediate value output by the speed limiting link passes through a limiting link to form a third intermediate value, the limiting lower limit of the limiting link is-2, and the limiting upper limit is 2.
Optionally, the method further comprises the steps of adding the primary frequency modulation strengthening link output as a frequency modulation target value and a load set value to obtain a controller set value, calculating a load difference value between the controller set value and input load feedback, taking the load difference value as input of a main control or power closed-loop control of a steam turbine of the thermal power generating unit, and adding the output of the main control or the power closed-loop control of the steam turbine of the thermal power generating unit to a total valve instruction to realize optimization of primary frequency modulation power response performance.
In addition, the application also provides an optimizing device for primary frequency modulation power response performance, which comprises the following components:
a spontaneous fluctuation cancellation suppression program unit for performing spontaneous fluctuation cancellation suppression; the spontaneous fluctuation cancellation and suppression program unit performs spontaneous fluctuation cancellation and suppression, which comprises the step of locking the main steam pressure p at the moment after the power grid frequency or the unit rotating speed passes through a primary frequency modulation dead zone T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; taking the output of the speed limit link as the output of the spontaneous fluctuation cancellation inhibition program unit;
and the instruction fusion program unit is used for adding the output of the spontaneous fluctuation cancellation suppression program unit into the total valve instruction so as to realize the optimization of primary frequency modulation power response performance.
Optionally, the calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
Optionally, the preset smaller values are all 0, and the preset larger values are all 100.
Optionally, the input end of the instruction fusion program unit is also connected with a gain link and a primary frequency modulation strengthening program unit, the gain link is used for outputting the output of the primary frequency modulation strengthening program unit to the instruction fusion program unit after being gained by K times through the gain link, and the primary frequency modulation strengthening program unit is used for forming an original frequency modulation target value by the power grid frequency or unit rotating speed signal through a rotating speed unequal rate link; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening program unit, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening program unit so as to realize the optimization of primary frequency modulation power response performance.
Optionally, the step of multiplying the output of the primary frequency modulation strengthening link by K times through the gain link means that the output of the primary frequency modulation strengthening link is multiplied by 1 time through the gain link.
Optionally, the preset smaller values are all 0, and the preset larger values are all 100.
Optionally, when the second intermediate value output by the speed limiting link passes through a limiting link to form a third intermediate value, the limiting lower limit of the limiting link is-2, and the limiting upper limit is 2.
Optionally, the input end of the instruction fusion program unit is further connected with a load closed-loop control program unit, and the load closed-loop control program unit is used for adding the primary frequency modulation strengthening link output as a frequency modulation target value and a load set value to obtain a controller set value, calculating a load difference value between the controller set value and input load feedback, taking the load difference value as input of a thermal power unit steam turbine main control or power closed-loop control, and sending output of the thermal power unit steam turbine main control or power closed-loop control to the instruction fusion program unit to realize optimization of primary frequency modulation power response performance.
In addition, the application also provides a device for optimizing the response performance of the primary frequency modulation power, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the optimization method of the response performance of the primary frequency modulation power.
Furthermore, the present application provides a computer readable storage medium having stored therein a computer program for being programmed or configured by a microprocessor to perform the method of optimizing the primary frequency modulated power response performance.
Compared with the prior art, the application has the following advantages: the application includes adding the output of the spontaneous fluctuation cancellation suppression link to the total valve instruction to optimize the response performance of the primary frequency modulation power, the spontaneous fluctuation cancellation suppression link generating output includes: after the power grid frequency or the unit rotating speed passes over the primary frequency modulation dead zone, the main steam pressure p at the moment is locked T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As input of speed limiting link with adjustable speed limiting rate, if the input rises, when the input is originally adjustedSetting the rising rate to a preset larger value when the frequency target value is positive or zero, and setting the rising rate to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the output of the speed limiting link is used as the output of the spontaneous fluctuation cancellation and suppression link, cancellation and suppression of spontaneous fluctuation can be realized through the spontaneous fluctuation cancellation and suppression loop, adverse effects of spontaneous fluctuation on primary frequency modulation performance of the thermal power generating unit can be suppressed, the thermal power generating unit has better primary frequency modulation power response performance, and the primary frequency modulation contribution electric quantity rate of the unit can be effectively improved, so that the primary frequency modulation qualification rate under the primary frequency modulation contribution rate assessment rule is improved, and the primary frequency modulation electric quantity assessment is reduced.
Drawings
Fig. 1 is a schematic diagram of a control principle of a spontaneous fluctuation cancellation suppression link in the first embodiment of the present application.
Fig. 2 is a schematic diagram of a control principle of a primary frequency modulation strengthening link in a second embodiment of the present application.
Fig. 3 is a schematic diagram illustrating a control principle of the formation of the total valve command in the third embodiment of the present application.
Detailed Description
The method disclosed by the application of the application is used for optimizing the primary frequency modulation performance of a certain 300MW subcritical thermal power generating unit.
Embodiment one:
the method for optimizing the response performance of the primary frequency modulation power in this embodiment includes adding the output of the spontaneous fluctuation cancellation suppression link to the total valve command to optimize the response performance of the primary frequency modulation power, as shown in fig. 1, where the generating the output of the spontaneous fluctuation cancellation suppression link includes: after the grid frequency or the unit rotational speed passes over the primary frequency modulation dead zone (for example, in the embodiment, when the unit rotational speed is more than 3002r/min or less than 2998 r/min), the main steam pressure p is locked T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; and taking the output of the speed limiting link as the output of the spontaneous fluctuation counteracting and inhibiting link.
In the present embodiment, a first intermediate value tmp for spontaneous fluctuation cancellation suppression is calculated 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
In the present embodiment, the first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 The functional expression of (2) is:
tmp 2 ＝tmp 1 -μ 0。
it should be noted that, the preset smaller value and larger value in the spontaneous fluctuation cancellation suppression link may be set according to actual needs. For example, as an alternative implementation manner, in this embodiment, the preset smaller values in the spontaneous fluctuation cancellation suppression link are all 0, and the preset larger values are all 100. When the original frequency modulation target value is positive or zero, the rising rate is set to 100, and when the original frequency modulation target value is negative, the rising rate is set to 0; the deceleration rate is set to 0 when the raw fm target value is positive and 100 when the raw fm target value is negative or zero.
It should be noted that, the spontaneous fluctuation cancellation suppression link in this embodiment is an auxiliary control method, and the implementation of the method does not depend on a specific total valve instruction generation strategy, but can be integrated with various existing total valve instruction generation strategies.
In addition, this embodiment also provides an optimization device for primary frequency modulation power response performance, including:
a spontaneous fluctuation cancellation suppression program unit for performing spontaneous fluctuation cancellation suppression; the spontaneous fluctuation cancellation and suppression program unit performs spontaneous fluctuation cancellation and suppression, which comprises the step of locking the main steam pressure p at the moment after the power grid frequency or the unit rotating speed passes through a primary frequency modulation dead zone T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; taking the output of the speed limit link as the output of the spontaneous fluctuation cancellation inhibition program unit;
and the instruction fusion program unit is used for adding the output of the spontaneous fluctuation cancellation suppression program unit into the total valve instruction so as to realize the optimization of primary frequency modulation power response performance.
In the present embodiment, a first intermediate value tmp for spontaneous fluctuation cancellation suppression is calculated 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
In this embodiment, the preset smaller values are all 0, and the preset larger values are all 100.
In addition, the embodiment also provides an optimization device for the primary frequency modulation power response performance, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the optimization method for the primary frequency modulation power response performance. In addition, the present embodiment also provides a computer readable storage medium having a computer program stored therein, the computer program being configured or programmed by a microprocessor to perform the above-described method for optimizing the primary frequency modulation power response performance.
Embodiment two:
the embodiment is a further improvement of the first embodiment, specifically, a primary frequency modulation strengthening link is further added on the basis of the spontaneous fluctuation counteracting and inhibiting link in the embodiment, and the embodiment further comprises adding the output of the primary frequency modulation strengthening link to a total valve instruction after gain of the gain link is K times so as to realize optimization of primary frequency modulation power response performance.
As shown in fig. 2, the primary frequency modulation reinforcement link generation output includes: forming an original frequency modulation target value by a rotational speed unequal rate link of a power grid frequency or unit rotational speed signal; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening link, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening link. According to the method, the adverse effect of spontaneous fluctuation is overcome by setting the primary frequency modulation strengthening link and the spontaneous fluctuation counteracting and inhibiting link, and the primary frequency modulation power response performance is improved by further strengthening the primary frequency modulation regulating effect under the normal running condition of the power grid.
In this embodiment, the step of multiplying the output of the primary frequency modulation strengthening step by K times the gain step means that the output of the primary frequency modulation strengthening step is multiplied by 1 time the gain step.
It should be noted that, the preset smaller value and larger value in the primary frequency modulation strengthening link may be set according to actual needs. For example, as an alternative implementation manner, the preset smaller values in the primary frequency modulation strengthening link in this embodiment are all 0, and the preset larger values are all 100.
In the primary frequency modulation strengthening link, when the second intermediate value output by the speed limiting link passes through a limiting link to form a third intermediate value, the upper limit and the lower limit of the limiting link can be valued according to the requirement. For example, as an alternative implementation manner, the lower limit of the clipping link in this embodiment is-2, and the upper limit of the clipping link is 2.
It should be noted that, the primary frequency modulation reinforcement link in this embodiment is an auxiliary control method, and the implementation of the primary frequency modulation reinforcement link is not dependent on a specific total valve instruction generation strategy, but can be integrated with the existing various total valve instruction generation strategies.
The primary frequency modulation power response performance optimizing device of the present embodiment is based on the primary frequency modulation power response performance optimizing device of the first embodiment, and the input end of the command fusion program unit is further connected with a gain link and a primary frequency modulation enhancement program unit, where the gain link is used to output the output of the primary frequency modulation enhancement program unit to the command fusion program unit after gain K times through the gain link, and the primary frequency modulation enhancement program unit is used to form an original frequency modulation target value by passing the power grid frequency or the unit rotation speed signal through the rotation speed unequal rate link; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening program unit, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening program unit so as to realize the optimization of primary frequency modulation power response performance.
In this embodiment, the step of multiplying the output of the primary frequency modulation strengthening step by K times the gain step means that the output of the primary frequency modulation strengthening step is multiplied by 1 time the gain step.
In this embodiment, the preset smaller values are all 0, and the preset larger values are all 100.
In this embodiment, when the second intermediate value output by the speed limiting link passes through a limiting link to form a third intermediate value, the limiting lower limit of the limiting link is-2, and the limiting upper limit is 2.
In addition, the embodiment also provides an optimization device for the primary frequency modulation power response performance, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the optimization method for the primary frequency modulation power response performance. In addition, the present embodiment also provides a computer readable storage medium having a computer program stored therein, the computer program being configured or programmed by a microprocessor to perform the above-described method for optimizing the primary frequency modulation power response performance.
Embodiment III:
the embodiment is a further improvement of the second embodiment, as shown in fig. 3, the embodiment further includes adding the primary frequency modulation strengthening link output as a frequency modulation target value and a load set value to obtain a controller set value, calculating a load difference value between the controller set value and an input load feedback, taking the load difference value as an input of a main control or a power closed-loop control of a thermal power unit steam turbine, adding the output of the main control or the power closed-loop control of the thermal power unit steam turbine to a total valve instruction to realize optimization of primary frequency modulation power response performance, that is, performing primary frequency modulation strengthening by utilizing the primary frequency modulation strengthening link output on the basis of the main control or the power closed-loop control of the conventional thermal power unit steam turbine so as to further inhibit adverse effects of spontaneous fluctuation on primary frequency modulation performance of the thermal power unit, so that the thermal power unit has better primary frequency modulation power response performance. The main control or the power closed-loop control of the steam turbine of the thermal power generating unit can adopt a required closed-loop control method, such as PID control, PI control, fuzzy control and the like, according to the requirements.
In the embodiment, a primary frequency modulation strengthening link and a spontaneous fluctuation cancellation suppression link are applied to the unit distributed control system according to the structure shown in fig. 3, and the primary frequency modulation strengthening link output is used as a frequency modulation target value and added with a load set value to be used as a set value of the main control and the power closed-loop control of the steam turbine of the thermal power unit; the output of the primary frequency modulation strengthening regulation link passes through a gain link (the gain coefficient of the gain link is 1), and the sum of the output of the gain link and the output of the spontaneous fluctuation cancellation inhibition link is taken as feedforward and added with the output of a main control or power closed-loop controller of the steam turbine to form a total valve position instruction.
In order to test the optimization effect of the method of the embodiment, the primary frequency modulation qualification rate is used as a verification index of the optimization effect. The definition of the primary frequency modulation qualification rate is the percentage of the primary frequency modulation qualification times divided by the total times of the primary frequency modulation tests, and when the contribution rate of the primary frequency modulation electric quantity obtained by a primary frequency modulation test is more than or equal to 50%, the primary frequency modulation test is qualified. Before the method is applied, 100 primary frequency modulation tests are carried out on the unit, the qualified times are 63 times, and the primary frequency modulation qualification rate is 63%; after the method is applied, 100 primary frequency modulation tests are carried out on the unit, the qualification times are 95 times, and the primary frequency modulation qualification rate is 95%.
The primary frequency modulation power response performance optimizing device of the embodiment is characterized in that on the basis of the primary frequency modulation power response performance optimizing device of the embodiment II, the input end of the command fusion program unit is further connected with a load closed-loop control program unit, the load closed-loop control program unit is used for adding primary frequency modulation strengthening link output serving as a frequency modulation target value and a load set value to obtain a controller set value, calculating a load difference value between the controller set value and input load feedback, taking the load difference value as input of a thermal power unit turbine main control or power closed-loop control, and sending output of the thermal power unit turbine main control or power closed-loop control to the command fusion program unit to realize optimization of the primary frequency modulation power response performance.
In addition, the embodiment also provides an optimization device for the primary frequency modulation power response performance, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the optimization method for the primary frequency modulation power response performance. In addition, the present embodiment also provides a computer readable storage medium having a computer program stored therein, the computer program being configured or programmed by a microprocessor to perform the above-described method for optimizing the primary frequency modulation power response performance.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above examples, and all technical solutions belonging to the concept of the present application belong to the protection scope of the present application. It should be noted that modifications and adaptations to the present application may occur to one skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (18)
1. The method for optimizing the response performance of the primary frequency modulation power is characterized by comprising the step of adding the output of a spontaneous fluctuation cancellation inhibition link to a total valve instruction to optimize the response performance of the primary frequency modulation power, wherein the step of generating the output of the spontaneous fluctuation cancellation inhibition link comprises the following steps: after the power grid frequency or the unit rotating speed passes over the primary frequency modulation dead zone, the main steam pressure p at the moment is locked T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; and taking the output of the speed limiting link as the output of the spontaneous fluctuation counteracting and inhibiting link.
2. The method of optimizing chirped power response performance of claim 1 wherein said calculating a first intermediate value tmp for idiopathic ripple cancellation suppression 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
3. The method for optimizing primary frequency modulation power response performance according to claim 1, wherein the preset smaller values are all 0, and the preset larger values are all 100.
4. The method of claim 1, further comprising adding the output of the chirped power boost link to the total valve command after gain K times the gain link to achieve optimization of chirped power response performance, the chirped boost link generating an output comprising: forming an original frequency modulation target value by a rotational speed unequal rate link of a power grid frequency or unit rotational speed signal; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening link, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening link.
5. The method of claim 4, wherein the step of multiplying the output of the primary frequency modulation enhancement step by K times is to multiplying the output of the primary frequency modulation enhancement step by 1 time.
6. The method of claim 4, wherein the predetermined smaller values are all 0 and the predetermined larger values are all 100.
7. The method for optimizing primary frequency modulation power response performance according to claim 4, wherein when the second intermediate value outputted from the speed limiting section is passed through a limiting section to form a third intermediate value, the limiting lower limit of the limiting section is-2, and the limiting upper limit is 2.
8. The method for optimizing primary frequency modulation power response performance according to claim 4, further comprising adding the primary frequency modulation strengthening link output as a frequency modulation target value to a load set value to obtain a controller set value, calculating a load difference between the controller set value and an input load feedback, taking the load difference as an input of a thermal power unit steam turbine main control or a power closed loop control, and adding an output of the thermal power unit steam turbine main control or the power closed loop control to a total valve instruction to realize optimization of primary frequency modulation power response performance.
9. An apparatus for optimizing primary frequency modulation power response performance, comprising:
a spontaneous fluctuation cancellation suppression program unit for performing spontaneous fluctuation cancellation suppression; the spontaneous fluctuation cancellation and suppression program unit performs spontaneous fluctuation cancellation and suppression, which comprises the step of locking the main steam pressure p at the moment after the power grid frequency or the unit rotating speed passes through a primary frequency modulation dead zone T0 And a total valve position command mu 0 According to the main-steam pressure p at this time T0 And a total valve position command mu 0 Calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The first intermediate value tmp 1 Subtracting the total valve position command mu 0 As a second intermediate value tmp for spontaneous fluctuation cancellation suppression 2 Second intermediate value tmp 2 As the input of the speed limiting link with adjustable limiting speed, if the input rises, the rising speed is set to a preset larger value when the original frequency modulation target value is positive or zero, and the rising speed is set to be the negative value when the original frequency modulation target value is negativeA preset smaller value; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; taking the output of the speed limit link as the output of the spontaneous fluctuation cancellation inhibition program unit;
and the instruction fusion program unit is used for adding the output of the spontaneous fluctuation cancellation suppression program unit into the total valve instruction so as to realize the optimization of primary frequency modulation power response performance.
10. The apparatus according to claim 9, wherein the calculating is performed for calculating a first intermediate value tmp for spontaneous fluctuation cancellation suppression 1 The functional expression of (2) is:
in the above, p T0 Mu, as main vapor pressure 0 For the total valve position command, p T Is the current value of the main steam pressure.
11. The apparatus for optimizing primary frequency modulation power response performance according to claim 9, wherein the preset smaller values are all 0, and the preset larger values are all 100.
12. The device for optimizing the response performance of the primary frequency modulation power according to claim 9, wherein the input end of the command fusion program unit is further connected with a gain link and a primary frequency modulation strengthening program unit, the gain link is used for outputting the output of the primary frequency modulation strengthening program unit to the command fusion program unit after gain of the gain link is K times, and the primary frequency modulation strengthening program unit is used for forming an original frequency modulation target value by the power grid frequency or unit rotating speed signal through a rotating speed unequal rate link; after the original frequency modulation target value passes through a differential link with adjustable gain, the output of the differential link is added with the original frequency modulation target value to form a first intermediate value; taking the first intermediate value as input of a speed limiting link with adjustable speed limiting rate, if the input rises, setting the rising rate as a preset larger value when the original frequency modulation target value is positive or zero, and setting the rising rate as a preset smaller value when the original frequency modulation target value is negative; if the input drops, setting the deceleration rate to a preset smaller value when the original frequency modulation target value is positive, and setting the deceleration rate to a preset larger value when the original frequency modulation target value is negative or zero; the second intermediate value output by the speed limiting link is subjected to an amplitude limiting link to form a third intermediate value; when the absolute value of the third intermediate value is larger than or equal to the absolute value of the original frequency modulation target value, the third intermediate value is used as the output of the primary frequency modulation strengthening program unit, otherwise, the original frequency modulation target value is used as the output of the primary frequency modulation strengthening program unit so as to realize the optimization of primary frequency modulation power response performance.
13. The apparatus for optimizing a chirped power response performance of claim 12 wherein the step of multiplying the output of the chirped boost step by K times the gain step is performed by 1 time the output of the chirped boost step.
14. The apparatus for optimizing primary power response performance according to claim 12, wherein the predetermined smaller values are each 0 and the predetermined larger values are each 100.
15. The apparatus for optimizing primary frequency modulation power response performance according to claim 12, wherein when the second intermediate value outputted from the speed limiting section is passed through a limiting section to form a third intermediate value, a limiting lower limit of the limiting section is-2, and a limiting upper limit of the limiting section is 2.
16. The device for optimizing primary frequency modulation power response performance according to claim 12, wherein the input end of the command fusion program unit is further connected with a load closed-loop control program unit, the load closed-loop control program unit is configured to add the primary frequency modulation strengthening link output as a frequency modulation target value and a load setting value to obtain a controller setting value, calculate a load difference between the controller setting value and an input load feedback, and use the load difference as an input of a main control or a power closed-loop control of a steam turbine of the thermal power unit, and send an output of the main control or the power closed-loop control of the steam turbine of the thermal power unit to the command fusion program unit to realize optimization of primary frequency modulation power response performance.
17. An apparatus for optimizing the performance of a chirped power response comprising a microprocessor and a memory interconnected, wherein the microprocessor is programmed or configured to perform the method for optimizing the performance of a chirped power response of any of claims 1 to 8.
18. A computer readable storage medium having a computer program stored therein, wherein the computer program is for programming or configuring by a microprocessor to perform the method of optimizing the primary frequency modulated power response performance of any one of claims 1 to 8.
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