CN107370156B - Power grid frequency modulation system based on electrode boiler - Google Patents
Power grid frequency modulation system based on electrode boiler Download PDFInfo
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- CN107370156B CN107370156B CN201710737861.1A CN201710737861A CN107370156B CN 107370156 B CN107370156 B CN 107370156B CN 201710737861 A CN201710737861 A CN 201710737861A CN 107370156 B CN107370156 B CN 107370156B
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Abstract
The invention provides a system for participating in power grid frequency modulation by an electrode boiler, which comprises a power grid, a power plant frequency modulation control module, an electrode boiler power control cabinet, the electrode boiler and a heat output module, and is linked with a unit by utilizing the characteristic of high power adjustment response speed of the electrode boiler, and the quick load response of the online electric quantity of the unit is realized by quickly lifting the power consumption load power of the electrode boiler, so that the increase of the operation difficulty and the reduction of the service life of the unit caused by the frequency modulation measures of the unit such as unit steam turbine door adjustment, the quick change of the steam turbine rotating speed, high-low plus switching and the like caused by frequency modulation AGC (automatic gain control) adjustment and DEH (digital. The hot water or steam heated by the electrode boiler can be used for supplying heat to the outside in winter, and for a pure condensing unit or a summer combined heat and power unit, the hot water or steam heated by the electrode boiler can be pumped into a corresponding thermodynamic system of a power plant according to the temperature and the pressure of the hot water or steam, so that the generator of the electrode boiler linkage unit can be utilized all the year round, and the requirement of the unit for rapidly responding to the power grid frequency modulation is met.
Description
Technical Field
The invention relates to the field of power grid frequency modulation, in particular to a thermal generator set which utilizes an electrode boiler to participate in power grid frequency modulation auxiliary service.
Background
Along with the rapid development of the national economy of China in recent years, the demand of people on electric power is also sharply increased, and the peak-to-valley difference is increasingly increased. The peak-to-valley ratio of Chinese power supply is about 10/0.7, which is much higher than the average level of general developing countries 1/0.63, and much higher than the peak-to-valley ratio of U.S. 1/0.25, so the peak-to-valley ratio of Chinese generator sets is a difficult task. The frequency modulation capability of the generator set is a first important barrier for maintaining power balance and safety and stability of a power grid, and the adjustment capability and performance of the generator set are particularly important for the dynamic stability of the power grid; in addition, the rapid development of power supplies such as wind energy and nuclear energy relatively reduces the self-regulation capability of the power grid, and the large-scale access of the wind turbine generator even introduces additional random power disturbance, so that the stability of the power grid is further deteriorated. The method has the advantages that the frequency modulation parameters and performance of the unit are reasonably standardized and monitored, the good frequency modulation capability of the unit is guaranteed, and the method has important significance for safe and stable operation of a power grid and optimal scheduling in the future smart power grid environment.
The Automatic Generation Control (AGC) and frequency modulation performance of the conventional thermal generator set is 2 important indexes in the grid-related performance of the overall-regulation set, the power grid dispatching has strict requirements on the AGC and frequency modulation performance of the set, the 2 indexes are also important contents for the evaluation of two detailed rules of the power grid, and particularly, the AGC quality directly reflects the performance of the set. At present, a unit mainly responds to the requirement of a power grid by opening or closing a turbine regulating valve by increasing or decreasing fuel quantity through coordinated control of a boiler and a turbine, and because the boiler has delay, the load response of the unit has limitation all the time; in order to ensure the adjustment allowance of the steam turbine, the adjusting door cannot be kept in a fully open state, and the adjustment depth is limited.
In addition, most power plants adopt a digital electro-hydraulic (DEH) control system at present, in order to meet the requirements of load stability and examination, frequent adjustment of a unit along with frequency change is avoided, the load stability is influenced, a large primary frequency modulation dead zone of a turbine rotating speed adjusting system is set, the primary frequency modulation effect is almost eliminated, and the frequency of a power grid is mainly maintained by secondary frequency modulation. Research shows that in sudden accidents and large load (power) disturbance, although many units have the capacity of adjusting the load, the frequency modulation response to the frequency deviation is almost zero, and then serious accidents that the frequency fluctuates greatly and even the system is broken down occur.
Disclosure of Invention
The invention utilizes the characteristic that the load power of the high-voltage electrode boiler can be rapidly adjusted and responded and steplessly adjusted, innovatively links the load control of the electrode boiler with the AGC of a power plant and the frequency modulation control of a power grid, and realizes the change requirements of the AGC and the frequency modulation of a unit response power grid on the load of the unit through the rapid load increase and decrease of the electrode boiler.
The technical scheme adopted by the invention for solving the technical problems is as follows: an electrode boiler based grid frequency modulation system, comprising:
the frequency modulation control module comprises a power grid power dispatching center and a power plant unit centralized control system, and is connected to the power supply control module and the power control cabinet to control the power supply control module and the power control cabinet;
the input end of the power supply control module is connected to the output of the power plant, and the output end of the power supply control module is connected to the power control cabinet of the electrode boiler and used for converting the electric energy output by the power plant and then transmitting the electric energy to the power control cabinet;
the power control cabinet is used for directly transmitting the received voltage or transmitting the voltage to the electrode boiler after transformation and controlling the power of the electrode boiler;
and the electrode boiler is used for converting input electric energy into heat energy.
Preferably, the power supply control module includes:
the first transformer is used for transforming the input voltage and then transmitting the transformed voltage to the power control cabinet; and
and the first switch is connected to two ends of the first transformer in parallel and directly transmits the input voltage to the power control cabinet after being closed.
Preferably, the power supply control module includes:
the second transformer is used for transforming the input voltage and then transmitting the transformed voltage to the power control cabinet; and
and the second switch is connected to the second transformer in series and transmits the input voltage to the power control cabinet through the second transformer after being closed.
Preferably, the power supply control module includes:
the third transformer is used for transforming the input voltage and then transmitting the transformed voltage to the power control cabinet; and
and the third switch is connected to two ends of the third transformer in parallel and directly transmits the input plant voltage to the power control cabinet after being closed.
Preferably, one end of the heat output module receives the output heat of the primary heat exchanger of the electrode boiler, and the other end outputs the heat to a heat supply pipe network or a thermal system of a power plant.
Preferably, the frequency modulation control module is configured to perform at least one of the following frequency modulation operations: primary frequency modulation control of a generator set, secondary frequency modulation control of the generator set, DEH adjustment of the generator set and Automatic Generation Control (AGC).
Preferably, the primary frequency modulation, the secondary frequency modulation, the Automatic Generation Control (AGC) and the control instruction in the frequency modulation service control module of the power grid and the power plant can directly act on the power control cabinet of the electrode boiler.
Preferably, the control instruction in the power grid and power plant frequency modulation service control module directly acts on the electrode boiler power control cabinet, and the power of the electrode boiler is rapidly increased and decreased, so that the power of the whole power plant on the internet can rapidly respond and change the load along with the power grid frequency modulation control signal under the condition that the load of the generator set outlet is not changed.
Preferably, the rapid increase and decrease of the power of the electrode boiler can be realized by adjusting the power through a power control cabinet of the electrode boiler, and can also be realized by adjusting the power supply voltage supplied to the electrode boiler by the first transformer, the second transformer and the third transformer.
Preferably, the power of the electrode boiler is rapidly increased and decreased, the fastest response time can reach the millisecond level, the general response time is 30S to 1 minute, and the power adjustment range of the electrode boiler is from 0% load to 100% load.
Preferably, the electrode boiler may be of a submerged type, a spray type, or a combination of the submerged type and the spray type.
Preferably, the supply voltage of the electrode boiler ranges from 380V to 110 kV.
Preferably, the power of the electrode boiler ranges from 3MW to 100 MW.
Preferably, the electrode boiler may be one of an electrode hot water boiler or an electrode steam boiler.
Preferably, the electrode boiler and the heat output module are connected with a centralized heat supply pipe network in winter heat supply seasons to supply heat or steam to the outside.
Preferably, the electrode boiler and the heat output module are used for driving output hot water or steam into a thermodynamic system of the power plant according to parameters in non-heating seasons and pure condensing units of the thermal power plant.
Preferably, the frequency modulation power regulation range of each unit of the power plant is +/-1% -6% MCR, the units are set to fully transmit according to rated power, the electrode boilers and the units in the power ranges corresponding to +/-1% -6% MCR are linked to perform frequency modulation response, and at the moment, the AGC (automatic gain control) response frequency modulation control of the units is realized by means of the increase or decrease of the power of the electrode boilers.
Preferably, when the AGC control instruction power generation amount PA of the power plant given by the power grid is greater than the actual power generation amount PG of the power plant, the frequency modulation control module and the electrode boiler power control cabinet reduce the power consumption power Δ PB of the electrode boiler to be equal to the difference between the AGC instruction power generation amount PA and the actual power generation amount PG of the power plant, that is, Δ PB is PA-PG; when the AGC control instruction generating capacity PA of the power plant given by the power grid is smaller than the actual generating capacity PG of the power plant, the frequency modulation control module is combined with the electrode boiler power control cabinet to increase the power consumption power Delta PB of the electrode boiler to be equal to the difference value between the AGC control instruction generating capacity PA and the actual generating capacity PG of the power plant, namely Delta PB is PG-PA.
Preferably, the frequency modulation power regulation range of each unit of the power plant is +/-1% to +/-6% MCR, and for a power grid frequency modulation command requiring the rapid load reduction of the power plant, the downward load regulation command is realized by putting the electrode boiler and increasing the electric power of the electrode boiler.
The command for requiring the power plant to rapidly increase the load is realized by at least one of primary frequency load-increasing means of the unit, such as AGC combined with DEH to increase and adjust the opening of a valve, cutting off a certain grade of high-pressure heater, cutting off a certain grade of low-pressure heater or condensate water throttling, and the like.
Preferably, when the AGC control command power generation amount PA of the power plant given by the power grid is larger than the actual power generation amount PG of the power plant, the frequency modulation control module is combined with a primary frequency modulation load raising means of the unit such as DEH to increase the opening of an adjusting valve, cut off a certain level of high-pressure heater, cut off a certain level of low-pressure heater or condensate water throttling and the like to increase the power generation amount delta P of the unit to be equal to the difference value between the AGC control command power generation amount PA and the actual power generation amount PG of the power plant, namely, the delta P is PA; when the AGC control instruction generated energy PA of the power plant given by the power grid is smaller than the actual generated energy PG of the power plant, the power consumption power Delta PB of the frequency modulation control module combined with the electrode boiler power control cabinet and put into the electrode boiler is equal to the difference value of the AGC control instruction generated energy PA and the actual generated energy PG of the power plant, namely Delta PB is PG-PA.
Preferably, each unit of the power plant can be linked with one or more electrode boilers to respond to the frequency modulation of the power grid.
Preferably, the plurality of units in the power plant can also share one or more electrode boilers through switching of a power supply line to respond to power grid frequency modulation.
The invention has the beneficial effects that:
1) the invention utilizes the characteristics of quick response and stepless regulation of the electrode boiler, and meets the assessment requirement of the power grid on the frequency modulation of the power plant by quickly increasing and decreasing the load power of the electrode boiler;
2) the invention abandons the conventional unit to meet the requirement of power grid frequency modulation, and the unit disturbance such as frequent movement of a steam turbine throttle or a large amount of quick load adjustment of a boiler, output change of a coal mill and the like caused by the control of a DEH system increases the operation safety of the unit and prolongs the service life of the unit;
3) according to the invention, the fastest response time of the load change of the electrode boiler can reach 4ms, and the response rate of frequency modulation of the thermal power generating unit can be greatly increased, so that the thermal power generating unit is suitable for more unstable wind power photovoltaic power grid structures in the future.
Drawings
Fig. 1 is a schematic diagram of a preferred embodiment of the grid frequency modulation system based on an electrode boiler according to the present invention.
Fig. 2 is a schematic view of another preferred embodiment of the grid frequency modulation system based on the electrode boiler according to the present invention.
Fig. 3 is a schematic view of a further preferred embodiment of the grid frequency modulation system based on an electrode boiler according to the present invention.
Fig. 4 is a schematic diagram of still another preferred embodiment of the grid frequency modulation system based on the electrode boiler according to the present invention.
Illustration of the drawings:
1. a step-up transformer; 2. a second transformer; 2-1, a switch; 3. a first transformer; 3-1, a switch; 4. a third transformer; 4-1, a switch; 5. an electrode boiler; 6. a power control cabinet; 7. the electrode boiler primary heat exchanger.
Detailed Description
For a further understanding of the inventive content of the present invention, the present invention will be described in more detail below with reference to specific examples, which are given for illustrative purposes only and are not intended to be limiting in any way; any insubstantial modifications of the invention, which would be obvious to those skilled in the art, are intended to be included within the scope of the invention.
Example 1
As shown in fig. 2, an electrode boiler-based grid frequency modulation system includes:
a frequency modulation control module comprising a power grid power dispatching center and a power plant centralized control system, which is connected to the power supply control module and the power control cabinet 6 to control the two;
the input end of the power supply control module is connected to the output of the power plant, and the output end of the power supply control module is connected to the power control cabinet 6 of the electrode boiler 5, and the power supply control module is used for converting the electric energy output by the power plant and then transmitting the electric energy to the power control cabinet 6;
the power control cabinet 6 is used for directly transmitting the received voltage or transmitting the voltage to the electrode boiler after transformation and controlling the power of the electrode boiler;
and the electrode boiler is used for converting input electric energy into heat energy.
In this embodiment, the power supply control module includes:
the first transformer 3 is used for transforming the input voltage and then transmitting the transformed voltage to the power control cabinet 6; and
and the first switch 3-1 is connected to two ends of the first transformer 3 in parallel and directly transmits the input voltage to the power control cabinet 6 after being closed.
In this embodiment, one end of the heat output module receives the output heat of the primary heat exchanger 7 of the electrode boiler, and the other end outputs the heat to a heat supply pipe network or a thermal system of a power plant.
In this embodiment, the frequency modulation control module is configured to perform at least one of the following frequency modulation operations: primary frequency modulation control of a generator set, secondary frequency modulation control of the generator set, DEH adjustment of the generator set and Automatic Generation Control (AGC).
In this embodiment, the primary frequency modulation, the secondary frequency modulation, the Automatic Generation Control (AGC), and the control command in the frequency modulation service control module of the power grid and the power plant may directly act on the power control cabinet (6) of the electrode boiler:
in this embodiment, the control instructions in the power grid and power plant frequency modulation service control module directly act on the electrode boiler power control cabinet, and through the rapid increase and decrease of the power of the electrode boiler, the grid power of the whole power plant makes rapid response and load change along with the power grid frequency modulation control signal under the condition that the load of the generator set outlet is kept unchanged;
in this embodiment, the rapid increase and decrease of the power of the electrode boiler can be realized by adjusting the power through a power control cabinet (6) of the electrode boiler itself, or by adjusting the supply voltages supplied to the electrode boiler by the first transformer 3, the second transformer 2, and the third transformer 4;
in this embodiment, the power of the electrode boiler 5 is rapidly increased and decreased, the fastest response time can reach the millisecond level, the general response time is 30S to 1 minute, and the power adjustment range of the electrode boiler is from 0% load to 100% load;
in this embodiment, the electrode boiler 5 may be of a submerged type, a spraying type, or a combination of the submerged type and the spraying type;
in this embodiment, the power supply voltage range of the electrode boiler 5 is 380V to 110 kV;
in this embodiment, the power range of the electrode boiler 5 is 3MW to 100 MW;
in this embodiment, the electrode boiler 5 may be one of an electrode hot water boiler or an electrode steam boiler;
in this embodiment, the electrode boiler 5 and the heat output module are connected to a central heating pipe network in winter heating seasons to supply heat or steam to the outside;
in the embodiment, the electrode boiler 5 and the heat output module are used for pumping the output hot water or steam into a thermodynamic system of the power plant according to parameters in non-heating seasons and pure condensing units of the thermal power plant;
in this embodiment, the frequency modulation power adjustment range of each unit of the power plant is ± 1% to ± 6% MCR, the units are set to fully transmit according to the rated power, the electrode boiler 5 in the power range corresponding to the ± 1% to ± 6% MCR is set to perform frequency modulation response in linkage with the units, and at this time, the unit AGC response frequency modulation control is realized by increasing or decreasing the power of the electrode boiler 5.
In this embodiment, when the AGC control instruction power generation amount PA of the power plant given by the power grid is greater than the actual power generation amount PG of the power plant, the frequency modulation control module is combined with the electrode boiler power control cabinet (6) to reduce the power consumption power Δ PB of the electrode boiler to be equal to the difference between the AGC instruction power generation amount PA and the actual power generation amount PG of the power plant, that is, Δ PB is PA-PG; when the AGC control instruction generated energy PA of the power plant given by the power grid is smaller than the actual generated energy PG of the power plant, the frequency modulation control module is combined with the electrode boiler power control cabinet (6) to increase the power consumption power Delta PB of the electrode boiler 5 to be equal to the difference value between the AGC instruction generated energy PA and the actual generated energy PG of the power plant, namely the Delta PB is PG-PA;
in this embodiment, the frequency modulation power adjustment range of each unit of the power plant is ± 1% to ± 6% MCR, and for the power grid frequency modulation command requiring the rapid load reduction of the power plant, the downward load adjustment command is realized by inputting the electrode boiler 5 and increasing the electric power thereof;
the command for requiring the power plant to rapidly increase the load is realized by at least one of primary frequency load-increasing means of the unit, such as AGC combined with DEH to increase and adjust the opening of a valve, cutting off a certain grade of high-pressure heater, cutting off a certain grade of low-pressure heater or condensate water throttling, and the like.
In this embodiment, when the AGC control instruction power generation amount PA of the power plant given by the power grid is greater than the actual power generation amount PG of the power plant, the frequency modulation control module increases the adjustment valve opening, cuts off a certain level of high-voltage heater, cuts off a certain level of low-voltage heater, or throttles condensed water, and the like, by a primary frequency modulation load-raising means of the unit itself, the power generation amount Δ P of the unit is increased to be equal to the difference between the AGC instruction power generation amount PA and the actual power generation amount PG of the power plant, that is, the Δ P is PA; when the AGC control instruction generated energy PA of the power plant given by the power grid is smaller than the actual generated energy PG of the power plant, the power consumption power Delta PB of the frequency modulation control module combined with the electrode boiler power control cabinet (6) put into the electrode boiler is equal to the difference value of the AGC instruction generated energy PA and the actual generated energy PG of the power plant, namely the Delta PB is PG-PA;
in this embodiment, each unit of the power plant may be linked to one or more electrode boilers to respond to the frequency modulation of the power grid;
in this embodiment, the multiple units in the power plant can also share one or more electrode boilers through power supply line switching to respond to power grid frequency modulation;
the invention has the beneficial effects that:
1) the invention utilizes the characteristics of quick response and stepless regulation of the electrode boiler, and meets the assessment requirement of the power grid on the frequency modulation of the power plant by quickly increasing and decreasing the load power of the electrode boiler;
2) the invention abandons the conventional unit to meet the requirement of power grid frequency modulation, and the unit disturbance such as frequent movement of a steam turbine throttle or a large amount of quick load adjustment of a boiler, output change of a coal mill and the like caused by the control of a DEH system increases the operation safety of the unit and prolongs the service life of the unit;
3) according to the invention, the fastest response time of the load change of the electrode boiler can reach 4ms, and the response rate of frequency modulation of the thermal power generating unit can be greatly increased, so that the thermal power generating unit is suitable for more unstable wind power photovoltaic power grid structures in the future.
Example 2
As shown in fig. 3, the electrode boiler of the present embodiment is substantially the same as the electrode boiler participating frequency modulation system mechanism described in embodiment 1, except that the power supply of the electrode boiler is wired at 220 kV-500 kV after the unit booster station, and then is stepped down to 380V-110 kV through the step-down transformer to supply power to the electrode boiler.
Example 3
As shown in fig. 4, the electrode boiler participating frequency modulation system mechanism in this embodiment is substantially the same as that in embodiment 1, except that the power supply of the electrode boiler is wired on the service line, if the voltage of the service line is consistent with the voltage required by the power supply of the electrode boiler, the power supply can be directly wired through an electrical switch, and if the voltages are different, the voltages are regulated to 380V-110 kV through a transformer to supply power to the electrode boiler.
Example 4
The power supply mode of the electrode boiler in this embodiment can adopt any one of the three power supply modes, and the main difference from the three power supply modes is that hot water heated by the electrode boiler is directly injected into a centralized heat supply pipe network, and if steam is heated by the electrode boiler, the steam is directly supplied to the outside.
Example 5
The power supply mode of the electrode boiler in this embodiment can adopt any one of the power supply modes of embodiments 1, 2 and 3, and is mainly different from the three embodiments in that hot water heated by the electrode boiler is directly fed into a proper position of a thermodynamic system of a power plant according to parameters of the hot water, and if steam is heated by the electrode boiler, the steam is fed into a proper position of the thermodynamic system of the power plant according to parameters of the steam.
While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the invention as set forth in the following claims. The foregoing detailed description has been presented in conjunction with specific embodiments of this invention, but is not intended to limit the invention thereto. Any simple modifications of the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims (16)
1. An electrode boiler based grid frequency modulation system, comprising:
the frequency modulation control module comprises a power grid power dispatching center and a power plant unit centralized control system, and is connected to the power supply control module and a power control cabinet (6) of the electrode boiler (5) to control the power supply control module and the power control cabinet;
the input end of the power supply control module is connected to the output of the power plant, and the output end of the power supply control module is connected to the power control cabinet (6) and used for converting the electric energy output by the power plant and then transmitting the electric energy to the power control cabinet (6);
the power control cabinet (6) is used for transmitting the received electric energy output by the power supply control module to the electrode boiler (5) and controlling the power of the electrode boiler (5);
the electrode boiler (5) is used for converting the electric energy output by the power control cabinet (6) into heat energy;
one end of the heat output module receives heat output by the primary heat exchanger (7) of the electrode boiler, and the other end outputs the heat to a heat supply pipe network or a thermodynamic system of a power plant;
control instructions of primary frequency modulation, secondary frequency modulation and Automatic Generation Control (AGC) in the frequency modulation control module directly act on the power control cabinet (6), and under the condition that the load of the generator outlet of the unit is kept unchanged by controlling the rapid increase and decrease of the power of the electrode boiler (5), the online electric quantity of the whole power plant makes rapid response and load change along with the frequency modulation control signal of the power grid;
the frequency modulation power regulation range of each unit of the power plant is +/-1% -6% MCR, the electrode boiler (5) with the power range corresponding to the +/-1% -6% MCR is linked with the units to perform frequency modulation response, and the AGC response frequency modulation control of the units is realized by depending on the increase or decrease of the power of the electrode boiler (5).
2. The electrode boiler based grid frequency modulation system according to claim 1, wherein said power supply control module comprises:
the input end of the first transformer (3) is connected to the output end of the generator and is used for transforming the electric energy output by the power plant and then transmitting the electric energy to the power control cabinet (6); and
and the first switch (3-1) is connected to two ends of the first transformer (3) in parallel and directly transmits the input voltage output by the power plant to the power control cabinet (6) after being closed.
3. The frequency modulation system for power grid based on electrode boiler as claimed in claim 1, wherein the output voltage of the power plant is boosted to 220 kV-500 kV by a step-up transformer (1) and then outputted to the power grid, and the power supply control module comprises:
a second transformer (2) with its input end connected to the output end of the step-up transformer (1) for transforming the electric energy output by the power plant and delivering it to the power control cabinet (6), an
And the second switch (2-1) is connected to the second transformer (2) in series and transmits the input power plant output voltage to the power control cabinet (6) through the second transformer (2) after being closed.
4. The electrode boiler based grid frequency modulation system according to claim 1, wherein said power supply control module comprises:
a third transformer (4) for transforming the service voltage and transmitting it to the power control cabinet (6), and
and the third switch (4-1) is connected to two ends of the third transformer (4) in parallel and directly transmits the input plant voltage to the power control cabinet (6) after being closed.
5. Frequency modulation system according to claim 1, characterized in that the power of the electrode boiler (5) is rapidly increased and decreased with fastest response time in the order of milliseconds and the power of the electrode boiler is adjusted in the range from 0% load to 100% load.
6. Grid frequency modulation system based on electrode boilers, according to claim 5, characterized in that the type of electrode boiler (5) is submerged or injection or a combination of submerged and injection.
7. Grid frequency modulation system based on an electrode boiler, according to claim 6, characterized in that the supply voltage of the electrode boiler (5) is in the range of 380V to 110 kV.
8. Grid frequency modulation system based on an electrode boiler according to claim 7, characterized in that the power of the electrode boiler (5) ranges from 3MW to 100 MW.
9. System for frequency modulation of an electrical network based on electrode boilers according to claim 8, characterized in that the electrode boiler (5) is one of an electrode hot water boiler or an electrode steam boiler.
10. The grid frequency modulation system based on the electrode boiler as claimed in claim 1, wherein the electrode boiler (5) and the heat output module are connected with a centralized heating network in winter heating season to supply heat or steam for external use.
11. The grid frequency modulation system based on the electrode boiler as claimed in claim 1, wherein the electrode boiler and the heat output module are used for inputting the output hot water or steam into the thermodynamic system of the power plant according to parameters in the non-heating season of the thermal power plant and in the straight condensing unit.
12. Electrode boiler based grid frequency modulation system according to claim 1,
the frequency modulation power regulation range of each unit of the power plant is +/-1% -6% MCR, and for a power grid frequency modulation command requiring rapid load reduction of the power plant, a downward load regulation command is realized by putting an electrode boiler (5) and increasing electric power of the electrode boiler;
for a command requiring a rapid load increase of the power plant, at least one of the adjustment of the valve opening or the condensate throttling is performed by the AGC in combination with the DEH increase.
13. The system of claim 12, wherein the power generation amount P is commanded when the AGC control of the grid to the power plant is performedAGreater than the actual power generation capacity P of the power plantGWhen the frequency modulation control module is combined with the power control cabinet (6), the power consumption △ P of the electrode boiler (5) is reducedBEqual to AGC command generating capacity PAAnd the actual power generation amount P of the power plantGDifference value, i.e. △ PB=PA-PGWhen the power grid gives AGC control instruction power generation amount P of power plantALess than the actual power generation P of the power plantGMeanwhile, the power consumption △ P of the electrode boiler (5) is increased by the combination of the frequency modulation control module and the power control cabinet (6)BEqual to AGC command generating capacity PAAnd the actual power generation amount P of the power plantGDifference value, i.e. △ PB=PG-PA。
14. The system of claim 12, wherein the power generation amount P is commanded when the AGC control of the grid to the power plant is performedAGreater than the actual power generation capacity P of the power plantGWhen the frequency modulation control module is combined with DEH (digital electro-hydraulic) to increase the opening of the adjusting valve or the generated energy △ P of the condensed water throttling increasing unit is equal to the generated energy P of the AGC (automatic gain control) instructionAAnd the actual power generation amount P of the power plantGDifference value △ P = PA-PG, and power generation amount P when AGC control command of power grid to power plantALess than the actual power generation P of the power plantGWhen the frequency modulation control module is combined with the power control cabinet (6) to be put into the power consumption △ P of the electrode boilerBEqual to AGC command generating capacity PAAnd the actual power generation amount P of the power plantGDifference value, i.e. △ PB=PG-PA。
15. System for modulating frequency in an electric network based on electrode boilers, in accordance with claim 1, characterized by the fact that each unit of the electric power plant is associated with one or more electrode boilers (5) in response to the modulation of the frequency in the electric network.
16. The system according to claim 1, wherein a plurality of units in the power plant share one or more electrode boilers (5) through power line switching to respond to the grid frequency modulation.
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| CN108534113A (en) * | 2018-04-28 | 2018-09-14 | 赫普科技发展（北京）有限公司 | A kind of load side electric heat storage boiler frequency modulation system and method |
| CN108448596B (en) * | 2018-05-30 | 2024-06-21 | 西安热工研究院有限公司 | Primary frequency modulation control system and method for thermal power generating unit |
| CN108826413A (en) * | 2018-07-13 | 2018-11-16 | 大连亨利测控仪表工程有限公司 | It is a kind of to utilize intelligence injection pressure reducer auxiliary power plant frequency modulation system |
| CN112994046A (en) * | 2021-04-13 | 2021-06-18 | 华中科技大学 | Method and device for electric boiler to participate in primary frequency modulation of electric power system |
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