CN216974935U - Primary frequency modulation system for thermal power generation - Google Patents
Primary frequency modulation system for thermal power generation Download PDFInfo
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Abstract
The application relates to a primary frequency modulation system for thermal power generation, which comprises a frequency detector, a frequency acquisition module, a frequency conversion module and a frequency conversion module, wherein the frequency detector is connected to a power grid to acquire the frequency of the power grid; the speed regulating valve is arranged on a communication pipeline between the main steam main pipe and a steam inlet of the steam turbine; the control unit is connected with the speed regulation valve and is used for regulating the opening of the speed regulation valve; the first detection piece is arranged on the main steam main pipe to collect first steam parameters corresponding to the main steam main pipe; the second detection piece is arranged on the heat supply main pipe to acquire a second steam parameter corresponding to the heat supply main pipe; the control unit is connected to the frequency detector, and when the frequency detector detects that the frequency deviation value of the power grid frequency exceeds a set threshold value, the control unit controls the opening of the speed regulation throttle according to the first steam parameter, the second steam parameter and the frequency deviation value. The frequency correction method and device have the effects of reducing the response time of power grid frequency correction and improving the quality and efficiency of primary frequency modulation.
Description
Technical Field
The application relates to the field of primary frequency modulation of a power grid, in particular to a primary frequency modulation system for thermal power generation.
Background
Thermal power generation is a power generation mode in which water is converted into steam by using heat energy generated by combustible materials during combustion, the kinetic energy of the steam is converted by a steam turbine, and finally the kinetic energy is converted into electric energy by a generator connected with the steam turbine.
Among the thermal power generation process, the steam that the boiler produced can advance into the female pipe of main steam, then in the reentrant steam turbine, the steam of pressure decay can let in the female pipe of heat supply behind the steam turbine, and the female pipe of heat supply communicates with each user's pipeline, forms the heat supply network to this recycles steam, promotes resource and energy utilization.
In the power generation process, the frequency of the power grid may deviate, so that the output of the power grid is unstable, the power utilization quality is influenced, and potential safety hazards may be generated. Therefore, the grid frequency needs to be corrected through primary frequency modulation so as to be recovered to be normal.
In a general primary frequency modulation method, the output of a steam turbine is adjusted by adjusting the steam flow and pressure by adjusting the dye supply amount, the air supply amount, the water supply amount, and the like of a boiler, thereby adjusting the grid frequency.
In view of the above-mentioned related technologies, the inventor believes that it takes a long time for the adjustment of the dye supply amount, the air supply amount, and the water supply amount of the boiler to be converted into the actual steam flow change, so that the correction of the grid frequency has a large hysteresis, and the response is too slow, resulting in a poor effect of primary frequency modulation.
SUMMERY OF THE UTILITY MODEL
In order to reduce the response time of grid frequency correction and improve the quality and the efficiency of primary frequency modulation, the application provides a primary frequency modulation system for thermal power generation.
The application provides a primary frequency modulation system for thermal power, adopts following technical scheme:
a primary frequency modulation system for thermal power generation, comprising:
the frequency detector is connected to a power grid to acquire the frequency of the power grid;
the speed regulating valve is arranged on a communication pipeline between the main steam main pipe and a steam inlet of the steam turbine;
the control unit is connected with the speed regulation valve and is used for regulating the opening of the speed regulation valve;
the first detection piece is arranged on the main steam main pipe to collect first steam parameters corresponding to the main steam main pipe; and the number of the first and second groups,
the second detection piece is arranged on the heat supply main pipe to acquire a second steam parameter corresponding to the heat supply main pipe;
the control unit is connected with the frequency detector, and when the frequency detector detects that the frequency deviation value of the power grid frequency exceeds a set threshold value, the control unit controls the opening of the speed regulating throttle according to the first steam parameter, the second steam parameter and the frequency deviation value.
By adopting the technical scheme, whether the grid frequency of the current power generation grid is normal is detected through the frequency detector, if the deviation is overlarge, the requirement of primary frequency modulation is indicated, the control unit controls the opening of the speed regulation valve so as to increase or decrease the steam inlet flow of the steam turbine, and the rotating speed of the generator is adjusted according to the frequency deviation value of the grid frequency, so that the grid frequency is corrected. And because the speed regulation valve directly acts on the steam turbine, the response speed of the speed regulation valve is far greater than that of boiler regulation, so that the response time of power grid frequency correction is reduced, and the quality and the efficiency of primary frequency regulation are improved. Considering the stability of the heat supply network, when the speed regulation valve is regulated, the adjustable range of the steam parameters of the main steam pipe and the heat supply pipe is reflected by the first steam parameter detected by the first detection part and the second steam parameter detected by the second detection part, so that the steam parameters in the main steam pipe and the heat supply pipe are prevented from being abnormal due to the regulation of the speed regulation valve, and the safety problem is avoided.
Preferably, the steam extraction and heat supply system further comprises a steam extraction and heat supply regulating valve, wherein the steam extraction and heat supply regulating valve is installed on a communication pipeline between a steam outlet of the steam turbine and the heat supply main pipe, and the control unit is connected to the steam extraction and heat supply regulating valve and is used for controlling the opening degree of the steam extraction and heat supply regulating valve according to the first steam parameter, the second steam parameter and the frequency deviation value when the frequency deviation value exceeds a set threshold value.
By adopting the technical scheme, the steam flow or the pressure of the steam outlet of the steam turbine can be adjusted by the steam extraction heat supply adjusting valve, so that the pressure difference of inlet steam and outlet steam of the steam turbine is adjusted, the rotation speed of the generator can be adjusted, and the frequency of a power grid can be corrected conveniently.
Preferably, the control unit comprises an adjusting subunit, the adjusting subunit is configured to calculate a first adjusting margin according to the first steam parameter and a preset boundary condition of the main steam pipe, calculate a second adjusting margin according to the second steam parameter and a preset boundary condition of the main heat supply pipe, and control the opening degree of the steam extraction and heat supply adjusting valve and the opening degree of the speed control throttle according to a comparison result of the first adjusting margin and the second adjusting margin.
By adopting the technical scheme, as the steam parameters of the main steam pipe and the heat supply pipe respectively have boundary conditions, and the heat supply network is abnormal when the steam parameters exceed the boundary conditions, in order to guarantee the safety and the stability of the heat supply network, the opening of the steam extraction and heat supply regulating valve and the opening of the speed regulating valve need to be regulated in the first regulation allowance and the second regulation allowance, so that the quality of primary frequency modulation is improved, the power grid is improved, and the safety of the heat supply network can be guaranteed.
Preferably, the control unit further comprises a switching subunit, and the switching subunit is connected to the adjusting subunit;
when the first adjusting allowance is lower than a first set value, stopping adjusting the opening of the speed adjusting valve and adjusting the opening of the steam extraction heat supply adjusting valve;
and when the second adjusting allowance is lower than a second set value, stopping adjusting the opening of the steam extraction and heat supply adjusting valve and adjusting the opening of the speed adjusting valve.
By adopting the technical scheme, when the first regulation allowance is lower than the first set value, the main steam pipe is close to the limit, at the moment, the regulation of the speed regulation valve is required to be stopped, the regulation is changed into the regulation of the steam extraction heat supply regulating valve, and if the second regulation allowance is lower than the second set value, the regulation of the opening of the steam extraction heat supply regulating valve is required to be stopped, the adjustment is changed into the opening of the speed regulation valve, so that the primary frequency modulation quality is improved while the safety of a heat network is not influenced.
Preferably, the steam-heating system further comprises a pressure-reducing adjusting door, the pressure-reducing adjusting door is mounted on a communicating pipeline of the main steam main pipe and the heat supply main pipe, and the control unit is connected to the pressure-reducing adjusting door and used for controlling the opening degree of the pressure-reducing adjusting door according to the first steam parameter, the second steam parameter and the frequency deviation value.
By adopting the technical scheme, the pressure difference between the main steam main pipe and the heat supply main pipe can be adjusted through the pressure reduction adjusting door, so that the pressure difference of inlet and outlet steam of the steam turbine is adjusted, and the rotating speed of the generator and the frequency of a power grid are adjusted.
Preferably, the control unit is configured to control the opening degree of the pressure-reducing adjustment door when the frequency deviation value exceeds a higher set value, which is higher than the set threshold value.
Through adopting above-mentioned technical scheme, because the flow between main steam main pipe of direct adjustment through the decompression adjustment door and the heat supply main pipe can lead to partial steam not to pass through the steam turbine to this waste that leads to the steam internal energy, consequently the decompression adjustment door only produces power compensation in the operating mode that the big frequency difference appears, with this promotion energy utilization.
Preferably, the system further comprises a resource distribution device connected to the boiler and used for being connected with the fuel supply source, the water supply source and the air supply equipment, and the control unit is connected to the resource distribution device and used for controlling the resource distribution device to adjust the fuel supply quantity, the water supply quantity and the air supply quantity of the boiler when the frequency deviation value of the power grid exceeds a set threshold value.
By adopting the technical scheme, when the frequency of the power grid needs to be corrected, the control unit controls the resource distribution device to adjust the input quantity of fuel, water and air of the boiler, so that the steam supply is adjusted according to the requirement of the power grid.
Preferably, the control unit further comprises a back-regulating subunit, when the frequency deviation value is lower than a safety preset value and the attenuation rate of the frequency deviation value is not zero, the back-regulating subunit controls the opening degree back of the steam extraction heat supply regulating valve and/or the speed regulation valve, and the safety preset value is lower than a set threshold value.
By adopting the technical scheme, the back adjustment of the three valves of the speed regulation steam valve, the steam extraction heat supply regulating valve and the pressure reduction regulating valve is realized through the back adjustment subunit, the effect is gradually exerted by matching with the raw material feeding amount regulation of the boiler, the balance between the boiler supply and demand regulation and the three valves of the speed regulation steam valve, the steam extraction heat supply regulating valve and the pressure reduction regulating valve is realized, and therefore, the waste of resources and energy is reduced while the stability of a power grid and a heat supply network is maintained.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the control unit controls the opening of the speed regulating valve to increase or decrease the steam inlet flow of the steam turbine, so that the rotating speed of the generator is adjusted according to the frequency deviation value of the power grid frequency, and the power grid frequency is corrected. The speed-regulating valve directly acts on the steam turbine, so that the response speed of the speed-regulating valve is far higher than that of boiler regulation, the response time of power grid frequency correction is shortened, and the quality and efficiency of primary frequency regulation are improved;
2. the steam flow or pressure of the steam outlet of the steam turbine can be adjusted through the steam extraction heat supply adjusting valve, so that the pressure difference of inlet steam and outlet steam of the steam turbine is adjusted, the rotation speed of the generator can be adjusted, and the frequency of a power grid can be conveniently corrected;
3. the pressure difference between the main steam main pipe and the heat supply main pipe can be adjusted through the pressure reduction adjusting door, so that the pressure difference of inlet steam and outlet steam of the steam turbine is adjusted, and the rotating speed of the generator and the frequency of a power grid are adjusted.
Drawings
Fig. 1 is a system block diagram of a primary frequency modulation system for thermal power generation according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of the primary frequency modulation system for thermal power generation applied to a power grid and a heat supply network according to the embodiment of the present application.
Description of reference numerals: 1. a boiler; 11. a resource allocation device; 12. a steam turbine; 2. a main steam main pipe; 21. a heat supply main pipe; 22. a first detecting member; 23. a second detecting member; 3. a frequency detector; 31. a speed regulation valve; 32. a steam extraction heat supply regulating valve; 33. a pressure reducing adjustment door; 4. a control unit; 41. a regulator subunit; 42. a switching subunit; 43. the subunit is recalled.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a boiler 1 is communicated with a main steam pipe 2, the main steam pipe 2 is communicated with steam inlets of a plurality of steam turbines 12, steam outlets of the steam turbines 12 are communicated with a heat supply main pipe 21, the heat supply main pipe 21 is divided into a medium-pressure main pipe and a low-pressure main pipe, and the medium-pressure main pipe and the low-pressure main pipe are used for respectively providing steam with different pressures so as to adapt to different user requirements.
The embodiment of the application discloses a primary frequency modulation system for thermal power generation. Referring to fig. 1 and 2, the primary frequency modulation system for thermal power generation includes a frequency detector 3, a speed regulation valve 31, an extraction and heat supply regulating valve 32, a pressure reduction regulating valve 33, and a control unit 4, wherein the frequency detector 3 is electrically connected to a power grid and used for collecting a current power grid frequency and calculating a frequency deviation value of the power grid frequency from a normal value, and the control unit 4 is connected to the frequency detector 3 and triggers a primary frequency modulation operation when the frequency deviation value exceeds a set threshold value. For example, when the normal value of the power grid frequency is 50Hz, and the current acquisition value is 50.06Hz, the frequency deviation value is 0.06Hz, and the set threshold value is 0.01, and then primary frequency modulation operation is triggered.
The speed regulation valve 31 is installed on the communicating pipeline of the main steam pipe 2 and the steam inlet of the steam turbine 12 and used for adjusting the flow and pressure of steam entering the steam turbine 12, the steam extraction and heat supply regulating valve 32 is installed on the communicating pipeline of the steam outlet of the steam turbine 12 and the heat supply pipe 21 and used for adjusting the flow and pressure of steam output by the steam turbine 12, and the pressure reduction regulating valve 33 is installed on the communicating pipeline of the main steam pipe 2 and the heat supply pipe 21 and used for adjusting the steam pressure difference between the main steam pipe 2 and the heat supply pipe 21.
The control unit 4 is connected to the speed regulation valve 31, the steam extraction and heat supply regulating valve 32 and the pressure reduction regulating valve 33 at the same time, and is used for controlling the opening degrees of the speed regulation valve 31, the steam extraction and heat supply regulating valve 32 and the pressure reduction regulating valve 33 according to the frequency deviation value. Since the flow rate between the main steam main 2 and the heating main 21 is directly adjusted by the decompression adjusting door 33, a part of steam does not pass through the steam turbine 12, thereby resulting in waste of internal energy of the steam. Therefore, when the frequency deviation value exceeds the set threshold and is lower than the high set value, the control unit 4 only starts the speed regulating valve 31 and/or the steam extraction and heat supply regulating valve 32, and when the frequency deviation value exceeds the high set value, the starting of the pressure reduction regulating valve 33 is increased, so that the utilization rate of resources and energy is improved.
When the heat supply network is kept stable, if the frequency of the power network is lower, the control unit 4 can increase the opening of the speed regulating valve 31, or increase the opening of the steam extraction heat supply regulating valve 32 or reduce the opening of the pressure reduction regulating valve 33, so that the stress of the steam turbine 12 is increased, and the frequency of the power network is increased; on the contrary, if the grid frequency is higher, the control unit 4 may reduce the opening of the speed regulation valve 31, or reduce the opening of the extraction heat supply regulating valve 32, or increase the opening of the pressure reduction regulating valve 33, so as to reduce the stress of the steam turbine 12, thereby reducing the grid frequency.
Considering the influence of the primary frequency modulation operation on the stability of the heat supply network, the steam parameters of the main steam main pipe 2 and the heat supply main pipe 21 need to be detected while the speed regulating valve 31, the steam extraction and heat supply regulating valve 32 and the pressure reduction regulating valve 33 are regulated, so that the safety of the main steam main pipe 2 and the heat supply main pipe 21 is prevented from being excessively influenced when the three valves are regulated. Therefore, a first detection part 22 is installed on the main steam main pipe 2, the first detection part 22 collects first steam parameters corresponding to the main steam main pipe 2, a second detection part 23 is installed on the heat supply main pipe 21, the second detection part 23 collects second steam parameters corresponding to the heat supply main pipe 21, and the first detection part 22 and the second detection part 23 can comprise one or more of a flow meter, a thermometer and a pressure meter.
The control unit 4 is divided into an adjusting subunit 41, a switching subunit 42 and a back-adjusting subunit 43, and the adjusting subunit 41 is used for realizing the use selection and coordination complementation between the speed regulating valve 31 and the steam extraction heat supply regulating valve 32. The main steam main pipe 2 and the heat supply main pipe 21 both comprise independent preset boundary conditions, the preset boundary conditions comprise a plurality of steam parameters such as flow, pressure, temperature and the like, each parameter generally comprises an upper limit value and a lower limit value, and when the current value of any parameter is lower than the lower limit value or higher than the upper limit value, the pipeline has potential safety hazards.
The adjusting subunit 41 is configured to calculate a first adjusting margin according to the first steam parameter and a preset boundary condition of the main steam main pipe 2, and calculate a second adjusting margin according to the second steam parameter and a preset boundary condition of the heat supply main pipe 21. When the first steam parameter is in a descending trend, the first adjustment allowance is used for measuring a difference value between the first steam parameter and a lower limit value, when the first steam parameter is reduced to be lower than the lower limit value, the first adjustment allowance is zero, when the first steam parameter is in an ascending trend, the first adjustment allowance is used for measuring a difference value between the first steam parameter and an upper limit value, and when the first steam parameter is increased to be higher than the upper limit value, the first adjustment allowance is zero. Similarly, when the second steam parameter falls below the lower limit value or rises above the upper limit value, the second adjustment margin is zero. The first steam parameter is the minimum value of the first adjustment allowance obtained by separately calculating the steam flow, the pressure and the temperature, and the second steam parameter is the minimum value of the second adjustment allowance obtained by separately calculating the steam flow, the pressure and the temperature in the same way.
The adjusting subunit 41 controls the opening of the extraction heat supply adjusting valve 32 and the opening of the speed regulating valve 31 according to the comparison result of the first adjusting allowance and the second adjusting allowance, that is, when the first adjusting allowance is greater than the second adjusting allowance, the opening of the speed regulating valve 31 is preferentially adjusted, and when the first adjusting allowance is less than or equal to the second adjusting allowance, the extraction heat supply adjusting valve 32 is preferentially adjusted.
The switching subunit 42 is connected to the adjusting subunit 41, and is configured to switch and select the speed-regulating valve 31 or the steam-extraction heat-supply adjusting valve 32 when any one of the first adjustment margin and the second adjustment margin is too low, specifically, when the first adjustment margin is lower than a first set value, stop adjusting the opening degree of the speed-regulating valve 31, and adjust the opening degree of the steam-extraction heat-supply adjusting valve 32; when the second adjustment margin is lower than the second set value, the adjustment of the opening degree of the extraction heat supply adjustment valve 32 is stopped, and the opening degree of the speed regulation valve 31 is adjusted. When the first adjustment margin is lower than the first set value and the second adjustment margin is lower than the second set value, the decompression adjustment door 33 is activated.
The primary frequency modulation operation further comprises adjustment of supply quantity of the boiler 1, a resource distribution device 11 is connected to the boiler 1, the resource distribution device 11 is connected to the control unit 4, the resource distribution device 11 comprises a fuel conveying belt used for being connected with a fuel supply source, a water pipe used for being connected with a water supply source, an air supply pipe used for being communicated with air supply equipment, a servo motor connected to the fuel conveying belt, a flow valve installed on the water pipe and an air speed controller connected to the air supply equipment, and therefore the fuel supply quantity, the water supply quantity and the air supply quantity of the boiler 1 can be adjusted conveniently.
When the frequency deviation value of the grid exceeds a set threshold value, the control unit 4 controls the resource distribution device 11 to adjust the fuel supply amount, the water supply amount, and the air supply amount of the boiler 1. When the heat supply network is stable, if the frequency of the power grid is low, the resource distribution device 11 needs to be controlled to increase the fuel supply amount, the water supply amount and the air supply amount of the boiler 1, so that the steam flow of the main steam main pipe 2 is increased, the rotating speed of the steam turbine 12 and the generator is increased, and the frequency of the power grid is finally increased.
The back-adjusting subunit 43 is used for coordinating the balance between the adjustment of the boiler 1 and the valve adjustment, and since the adjustment of the three valves, i.e., the speed-adjusting valve 31, the steam-extraction heat-supply adjusting valve 32 and the pressure-reduction adjusting valve 33, can change the optimal state of the heat supply network, and the adjustment of the valves only realizes the internal adjustment of the steam, and does not fundamentally improve the supply and demand relationship of the steam, the supply and demand balance is finally realized by the adjustment of the boiler 1, and the resource and energy utilization rate is improved. And when the effect of the boiler 1 on adjusting the power grid frequency correction is gradually shown, the three valves need to be adjusted back, so that the heat supply network returns to the efficient stable state again.
When the frequency deviation value is lower than the safety preset value and the attenuation rate of the frequency deviation value is not zero, the back-adjusting subunit 43 controls the back-adjusting of the opening degree of the steam extraction heat supply regulating valve 32 and/or the speed regulating valve 31 and/or the pressure reducing regulating valve 33. Specifically, the safety preset value is lower than the set threshold, the frequency deviation value is lower than the safety preset value to indicate that the power grid frequency is close to normal, excessive correction is not needed, the attenuation rate of the frequency deviation value is not zero, the effect of adjusting the supply quantity of the boiler 1 is continuously generated, if the effect is not generated, the adjustment is not needed, and the opening degree of the three valves is kept unchanged when the attenuation rate of the frequency deviation value is detected. When the attenuation rate of the frequency deviation value is not zero, the opening degree of the three valves is adjusted back to just compensate the attenuated frequency deviation value, and the stability of the power grid frequency is maintained. The callback rate of the three valves changes according to the change of the frequency deviation value, if the frequency deviation value is too fast attenuated, the callback rate needs to be increased, and if the frequency deviation value is reversely increased, the callback rate needs to be reduced, so that the excessive fluctuation of the power grid frequency is avoided.
The implementation principle of a primary frequency modulation system for thermal power generation in the embodiment of the application is as follows: when the frequency deviation value detected by the frequency detector 3 exceeds the set threshold and is lower than the high-level set value, the control unit 4 starts the speed-regulating valve 31 and the steam-extraction heat-supply regulating valve 32, and during the period, the speed-regulating valve 31 or the steam-extraction heat-supply regulating valve 32 is selected to be started according to the first regulating margin and the second regulating margin, and when the frequency deviation value exceeds the high-level set value, the pressure-reduction regulating valve 33 is additionally started, so that the utilization rate of resources and energy is improved.
The fuel quantity, the air supply quantity and the water inlet quantity of the boiler 1 are synchronously adjusted while the three valves are adjusted, when the frequency deviation value is lower than the safety preset value and the attenuation rate of the frequency deviation value is not zero, the speed regulating valve 31, the steam extraction heat supply regulating valve 32 and the pressure reduction regulating valve 33 are adjusted back, and the valves which are not started during primary frequency modulation do not need to be adjusted back. In the process of callback, the change of the frequency deviation value is monitored, and the callback rate and the like are adjusted according to the change direction and the change rate of the frequency deviation value, so that the stability of the power grid frequency is maintained. The complementary combination of three valve regulation modes and the boiler 1 regulation mode not only improves the quality and efficiency of primary frequency modulation, but also improves the utilization rate of resources and energy.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a primary frequency modulation system for thermal power, its characterized in that: the method comprises the following steps:
a frequency detector (3) for connection to the grid to acquire the grid frequency;
the speed regulation valve (31) is arranged on a communication pipeline between the main steam main pipe (2) and a steam inlet of the steam turbine (12);
the control unit (4) is connected with the speed regulation air valve (31) and is used for adjusting the opening degree of the speed regulation air valve (31);
the first detection piece (22) is arranged on the main steam main pipe (2) to collect first steam parameters corresponding to the main steam main pipe (2); and the number of the first and second groups,
the second detection piece (23) is arranged on the heat supply main pipe (21) to acquire a second steam parameter corresponding to the heat supply main pipe (21);
the control unit (4) is connected to the frequency detector (3), and when the frequency detector (3) detects that the frequency deviation value of the power grid frequency exceeds a set threshold value, the control unit (4) controls the opening of the speed regulation valve (31) according to the first steam parameter, the second steam parameter and the frequency deviation value.
2. The primary frequency modulation system for thermal power generation according to claim 1, characterized in that: the steam extraction and heat supply control system is characterized by further comprising a steam extraction and heat supply adjusting valve (32), wherein the steam extraction and heat supply adjusting valve (32) is installed on a communicating pipeline of a steam outlet of the steam turbine (12) and a heat supply main pipe (21), and the control unit (4) is connected to the steam extraction and heat supply adjusting valve (32) and used for controlling the opening degree of the steam extraction and heat supply adjusting valve (32) according to the first steam parameter, the second steam parameter and the frequency deviation value when the frequency deviation value exceeds a set threshold value.
3. The primary frequency modulation system for thermal power generation according to claim 2, characterized in that: the control unit (4) comprises an adjusting subunit (41), the adjusting subunit (41) is used for calculating to obtain a first adjusting allowance according to a first steam parameter and a preset boundary condition of the main steam main pipe (2), calculating to obtain a second adjusting allowance according to a second steam parameter and a preset boundary condition of the heat supply main pipe (21), and controlling the opening degree of the steam extraction heat supply adjusting valve (32) and the opening degree of the speed regulation steam valve (31) according to a comparison result of the first adjusting allowance and the second adjusting allowance.
4. The primary frequency modulation system for thermal power generation according to claim 3, characterized in that: the control unit (4) further comprises a switching subunit (42), the switching subunit (42) being connected to the regulating subunit (41);
when the first adjustment allowance is lower than a first set value, stopping adjusting the opening of the speed regulation valve (31) and adjusting the opening of the steam extraction heat supply adjusting valve (32);
and when the second adjustment allowance is lower than a second set value, stopping adjusting the opening of the steam extraction and heat supply adjusting valve (32), and adjusting the opening of the speed regulation valve (31).
5. The primary frequency modulation system for thermal power generation according to claim 2, characterized in that: the steam heating system is characterized by further comprising a decompression adjusting door (33), wherein the decompression adjusting door (33) is installed on a communication pipeline of the main steam main pipe (2) and the heat supply main pipe (21), and the control unit (4) is connected to the decompression adjusting door (33) and used for controlling the opening degree of the decompression adjusting door (33) according to the first steam parameters, the second steam parameters and the frequency deviation value.
6. The primary frequency modulation system for thermal power generation according to claim 5, characterized in that: the control unit (4) is used for controlling the opening of the decompression adjusting door (33) when the frequency deviation value exceeds a high set value, and the high set value is higher than a set threshold value.
7. The primary frequency modulation system for thermal power generation according to claim 2, characterized in that: the energy-saving and energy-saving boiler is characterized by further comprising a resource distribution device (11), wherein the resource distribution device (11) is connected to the boiler (1) and is used for being connected with a fuel supply source, a water supply source and air supply equipment, and the control unit (4) is connected to the resource distribution device (11) and is used for controlling the resource distribution device (11) to adjust the fuel supply quantity, the water supply quantity and the air supply quantity of the boiler (1) when the frequency deviation value of the power grid exceeds a set threshold value.
8. The primary frequency modulation system for thermal power generation according to claim 7, characterized in that: the control unit (4) further comprises a callback subunit (43), when the frequency deviation value is lower than a safety preset value and the attenuation rate of the frequency deviation value is not zero, the callback subunit (43) controls the opening degree callback of the steam extraction heat supply regulating valve (32) and/or the speed regulation valve (31), and the safety preset value is lower than a set threshold value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220898929.0U CN216974935U (en) | 2022-04-18 | 2022-04-18 | Primary frequency modulation system for thermal power generation |
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| CN202220898929.0U CN216974935U (en) | 2022-04-18 | 2022-04-18 | Primary frequency modulation system for thermal power generation |
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