CN114216115A - Primary frequency modulation automatic control system based on feedforward pressure - Google Patents
Primary frequency modulation automatic control system based on feedforward pressure Download PDFInfo
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- CN114216115A CN114216115A CN202111469139.7A CN202111469139A CN114216115A CN 114216115 A CN114216115 A CN 114216115A CN 202111469139 A CN202111469139 A CN 202111469139A CN 114216115 A CN114216115 A CN 114216115A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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Abstract
The invention belongs to the technical field of automatic control, and particularly relates to a primary frequency modulation automatic control system based on feedforward pressure, which comprises: the invention solves the technical problems of poor adjusting quality of important parameters of a unit and large deviation of main steam pressure during primary frequency modulation action, and solves the problems of load response lag, insufficient primary frequency modulation response or response overshoot and poor load stability.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a primary frequency modulation automatic control system based on feedforward pressure.
Background
Since electric energy cannot be stored, the balance between power supply and power consumption is very important, and the grid frequency is an important index reflecting the condition. The basic principle of primary frequency modulation is that a unit directly receives a deviation signal of the power grid frequency, and the purpose of stabilizing the power grid frequency is achieved by changing the actual load of the unit, and the primary frequency modulation mainly aims at quickly eliminating the small-amplitude load disturbance of the whole power grid. With the large-scale access of intermittent power sources to a power grid and the continuous increase of the power receiving scale of extra-high voltage alternating current and direct current, the uncertainty of power generation, power transmission and power utilization of the power grid forms a new challenge for the active power balance control of an interconnected power grid, and the existing thermal power generating units and hydroelectric power generating units mainly participate in primary frequency modulation of the power grid; and part of wind power, photovoltaic and energy storage also has the primary frequency modulation capability of the power grid.
Under the operation condition of a complex power grid, the performance of primary frequency modulation is necessarily improved. The primary frequency modulation of the thermal power generating unit is realized by changing the opening degree of a steam turbine adjusting valve to quickly respond to the load requirement of a power grid, and energy is stored in a boiler. When the unit carries out a large frequency difference test or the actual power grid frequency deviates from a rated value for a long time, the fluctuation of main parameters such as the main steam pressure of the unit is large, the safety of the unit is influenced, and the continuity of primary frequency modulation action is reduced.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides an automatic control system based on feedforward pressure for primary frequency modulation.
In order to solve the technical problems, the invention adopts the technical scheme that:
a primary frequency modulation feedforward-based pressure automatic control system, comprising: grid frequency parameter transmitter PT1, main steam pressure parameter transmitter PT2, boiler master control command parameter transmitter PT3, new boiler master control command parameter transmitter PT4, function generator module M1, function generator module M2, multiplier module M3, switching module M4, set value module M5, rate generator module M6, dead zone module M7, adder module M8, output end of grid frequency parameter transmitter PT1 and input end i of function generator module M11Output O of the connection, function generator module M11And a first input terminal i of the multiplier module M33The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M22Output O of the connection, function generator module M22And a second input terminal of the multiplier module M3i4Connected to the output O of the multiplier module M33And a first input terminal i of the switching module M45Connected to the output O of the setpoint module M54And a second input terminal i of the switching module M46The switching end S of the switching module M4 is connected with a primary frequency modulation input signal, and the output end O of the switching module M45Input terminal i of and rate generator module M67Connected to the output O of the rate generator module M66Input terminal i of dead zone module M78Connected to the output O of the dead band module M77And a first input terminal i of the adder module M89The output end of the boiler main control instruction parameter transmitter PT3 is connected with the second input end i of the adder module M810Connected to the output O of the adder module M88And connecting a new boiler main control instruction parameter transmitter PT 4.
The calculation method of the function generator module M1 is as follows: when the grid frequency is less than or equal to 49.7167Hz, O is output1=30, when the grid frequency is 50.2833Hz or higher, O is output1= -30, otherwise, output O1=0。
The calculation method of the function generator module M2 is as follows: output O2And (= X/30), wherein X is the main steam pressure value.
The calculation method of the multiplier module M3 is as follows: o is3=i3×i4。
The calculation method of the switching module M4 is as follows: when S =0, O5= i5When S =1, O5= i6。
Set value R =0, i.e. output O, of set value block M54=0。
The calculation method of the rate generator module M6 is as follows: when inputting the value i7When changed, output value O6Gradually changing to an input value i according to a measuring range of 2.5 percent per second7。
The dead band module M7 is a dead band module with a dead band value of 2, i.e., when the input value i is8When the absolute value of (A) is less than or equal to 2, O is outputted7=0, when a value i is input8When the absolute value of (A) is greater than 2, the output O is7= i8。
The calculation method of the adder module M8 is as follows: o is8=i9+i10。
Compared with the prior art, the invention has the following beneficial effects.
The invention solves the technical problems of poor quality of unit important parameter adjustment and large deviation of main steam pressure during primary frequency modulation action, solves the problems of load response lag, insufficient primary frequency modulation response or response overshoot and poor load stability, and has the control principle that on the basis of a conventional electric regulation side primary frequency modulation control strategy and a unit coordination side control strategy, a time frequency difference signal of the primary frequency modulation action is fitted into a load signal to form a primary frequency modulation input signal which is directly superposed on the output of an original boiler main control loop by introducing a feedforward control loop so as to respond the change of the load more quickly, and abandons the conventional control idea that the coal quantity and the air quantity water supply quantity are synchronously increased and decreased according to the proportion when the primary frequency modulation of the unit changes, so that the boiler main control is operated in advance, the change of the grid frequency is limited in a certain range, and the high efficiency of the primary frequency modulation function is ensured, the stability of a power grid is maintained, and meanwhile, important parameters of the unit are effectively kept in a safe and stable range, and the unit is operated safely and stably.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples.
A primary frequency modulation feedforward-based pressure automatic control system, comprising: grid frequency parameter transmitter PT1, main steam pressure parameter transmitter PT2, boiler master control command parameter transmitter PT3, new boiler master control command parameter transmitter PT4, function generator module M1, function generator module M2, multiplier module M3, switching module M4, set value module M5, rate generator module M6, dead zone module M7, adder module M8, output end of grid frequency parameter transmitter PT1 and input end i of function generator module M11Output O of the connection, function generator module M11And a first input terminal i of the multiplier module M33The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M22Output O of the connection, function generator module M22And a second input terminal i of the multiplier module M34Connected to the output O of the multiplier module M33And a first input terminal i of the switching module M45Connected to the output O of the setpoint module M54And a second input terminal i of the switching module M46The switching end S of the switching module M4 is connected with a primary frequency modulation input signal, and the output end O of the switching module M45Input terminal i of and rate generator module M67Connected to the output O of the rate generator module M66Input terminal i of dead zone module M78Connected to the output O of the dead band module M77And a first input terminal i of the adder module M89The output end of the boiler main control instruction parameter transmitter PT3 is connected with the second input end i of the adder module M810Connected to the output O of the adder module M88And connecting a new boiler main control instruction parameter transmitter PT 4.
The calculation method of the function generator module M1 is as follows: when the grid frequency is less than or equal to 49.7167Hz, O is output1=30, when the grid frequency is 50.2833Hz or higher, O is output1= -30, otherwise, output O1=0。
The calculation method of the function generator module M2 is as follows: output O2And (= X/30), wherein X is the main steam pressure value.
The calculation method of the multiplier module M3 is as follows: o is3=i3×i4。
The calculation method of the switching module M4 is as follows: when S =0, O5= i5When S =1, O5= i6。
Set value R =0, i.e. output O, of set value block M54=0。
The calculation method of the rate generator module M6 is as follows: when inputting the value i7When changed, output value O6Gradually changing to an input value i according to a measuring range of 2.5 percent per second7。
The dead band module M7 is a dead band module with a dead band value of 2, i.e., when the input value i is8When the absolute value of (A) is less than or equal to 2, O is outputted7=0, when a value i is input8When the absolute value of (A) is greater than 2, the output O is7= i8。
The calculation method of the adder module M8 is as follows: o is8=i9+i10。
The principle of the invention is as follows:
the invention is provided with a dead zone module M7, the dead zone value of the dead zone module M7 is 2, in order to ensure the control effectiveness, the calculation method of a function generator module M1 is adjusted according to the dead zone value, the grid frequency of the boiler is 50Hz under the normal condition, and when the grid frequency is less than or equal to 49.7167Hz, O is output1=30, when the grid frequency is 50.2833Hz or higher, O is output1= -30, otherwise, output O1= 0; since the limit value of the main steam pressure value of the normal boiler is 30MPa, the calculation method of the function generator module M2 in the invention is set as follows: output O2=X/30。
The control principle of the invention is that on the basis of a conventional electric regulation side primary frequency modulation control strategy and a unit coordination side control strategy, a primary frequency modulation action time-frequency difference signal is fitted into a load signal to form a primary frequency modulation input signal, and the primary frequency modulation input signal is directly superposed on the output of an original boiler main control loop by introducing a feedforward control loop, so that the load change is responded more quickly.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (9)
1. A primary frequency modulation feedforward-based pressure automatic control system is characterized by comprising: power grid frequency parameter transmitter PT1 and main steam pressure parameter changeThe device comprises a transmitter PT2, a boiler master control command parameter transmitter PT3, a new boiler master control command parameter transmitter PT4, a function generator module M1, a function generator module M2, a multiplier module M3, a switching module M4, a set value module M5, a rate generator module M6, a dead zone module M7 and an adder module M8, wherein the output end of a grid frequency parameter transmitter PT1 and the input end i of the function generator module M1 are connected in series1Output O of the connection, function generator module M11And a first input terminal i of the multiplier module M33The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M22Output O of the connection, function generator module M22And a second input terminal i of the multiplier module M34Connected to the output O of the multiplier module M33And a first input terminal i of the switching module M45Connected to the output O of the setpoint module M54And a second input terminal i of the switching module M46The switching end S of the switching module M4 is connected with a primary frequency modulation input signal, and the output end O of the switching module M45Input terminal i of and rate generator module M67Connected to the output O of the rate generator module M66Input terminal i of dead zone module M78Connected to the output O of the dead band module M77And a first input terminal i of the adder module M89The output end of the boiler main control instruction parameter transmitter PT3 is connected with the second input end i of the adder module M810Connected to the output O of the adder module M88And connecting a new boiler main control instruction parameter transmitter PT 4.
2. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 1, wherein the function generator module M1 is calculated by: when the grid frequency is less than or equal to 49.7167Hz, O is output1=30, when the grid frequency is 50.2833Hz or higher, O is output1= -30, otherwise, output O1=0。
3. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 2,the calculation method of the function generator module M2 is as follows: output O2And (= X/30), wherein X is the main steam pressure value.
4. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 3, wherein the multiplier module M3 is calculated by: o is3=i3×i4。
5. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 4, wherein the calculation method of the switching module M4 is as follows: when S =0, O5= i5When S =1, O5= i6。
6. A primary frequency modulation feed forward based pressure automatic control system as claimed in claim 5, characterized in that the set point R =0 of the set point module M5.
7. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 6, wherein the calculation method of the rate generator module M6 is as follows: when inputting the value i7When changed, output value O6Gradually changing to an input value i according to a measuring range of 2.5 percent per second7。
8. A chirp-based feed forward pressure automatic control system according to claim 7, wherein the deadband module M7 is a deadband module with a deadband value of 2.
9. A primary frequency modulation feed forward pressure based automatic control system as claimed in claim 8, wherein the adder module M8 is calculated by: o is8=i9+i10。
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| JP2001082701A (en) * | 1999-09-16 | 2001-03-30 | Mitsubishi Heavy Ind Ltd | Boiler/turbine generator control system |
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| CN203223900U (en) * | 2013-04-09 | 2013-10-02 | 国家电网公司 | Predictive feedforward control-adopting boiler master control system for large generating sets |
| CN105222130A (en) * | 2014-06-12 | 2016-01-06 | 国网山西省电力公司电力科学研究院 | Double Dipleg CFB Boiler First air control system |
| CN108767894A (en) * | 2018-04-28 | 2018-11-06 | 国网山东省电力公司电力科学研究院 | Unit integrated control method and system based on Grid control deviation |
| CN111562736A (en) * | 2020-05-20 | 2020-08-21 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Boiler master control system and method during primary frequency modulation action of supercritical unit |
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Patent Citations (6)
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| JP2001082701A (en) * | 1999-09-16 | 2001-03-30 | Mitsubishi Heavy Ind Ltd | Boiler/turbine generator control system |
| JP2009300038A (en) * | 2008-06-16 | 2009-12-24 | Babcock Hitachi Kk | Boiler controller and boiler control method |
| CN203223900U (en) * | 2013-04-09 | 2013-10-02 | 国家电网公司 | Predictive feedforward control-adopting boiler master control system for large generating sets |
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| CN108767894A (en) * | 2018-04-28 | 2018-11-06 | 国网山东省电力公司电力科学研究院 | Unit integrated control method and system based on Grid control deviation |
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