CN114216115B - Primary frequency modulation based feedforward pressure automatic control system - Google Patents
Primary frequency modulation based feedforward pressure automatic control system Download PDFInfo
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- CN114216115B CN114216115B CN202111469139.7A CN202111469139A CN114216115B CN 114216115 B CN114216115 B CN 114216115B CN 202111469139 A CN202111469139 A CN 202111469139A CN 114216115 B CN114216115 B CN 114216115B
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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 feedforward pressure-based automatic control system, which comprises the following components: 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, 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 electrical energy is not storable, the balance of power supply and power usage is very important, and grid frequency is an important indicator reflecting this situation. The basic principle of primary frequency modulation is that a unit directly receives a deviation signal of the power grid frequency, the purpose of stabilizing the power grid frequency is achieved by changing the actual load of the unit, and the primary frequency modulation is mainly aimed at rapidly eliminating small-amplitude load disturbance of the whole power grid. With the continuous increase of the large-scale access of an intermittent power supply to a power grid and the power receiving and transmitting scale of ultra-high voltage alternating current and direct current, the uncertainty of power generation, power transmission and power consumption of the power grid forms a new challenge for the active balance control of the interconnected power grid, and the active balance control mainly participates in primary frequency modulation of the power grid; and part of wind power, photovoltaic and energy storage also have the primary frequency modulation capability of the power grid.
Under the operation condition of a complex power grid, the primary frequency modulation performance is required to be 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 the energy is stored in a boiler. When the unit performs a large-frequency-difference test or the actual power grid frequency deviates from the rated value for a long time, main parameters such as main steam pressure of the unit are greatly fluctuated, so that the safety of the unit is affected, and the persistence of primary frequency modulation action is reduced.
Disclosure of Invention
The invention overcomes the defects existing in the prior art and provides a primary frequency modulation feedforward pressure-based automatic control system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a primary frequency modulation feedforward pressure based automatic control system comprising: the system comprises a power grid frequency parameter transmitter PT1, a main steam pressure parameter transmitter PT2, a boiler main control instruction parameter transmitter PT3, a new boiler main control instruction 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 the power grid frequency parameter transmitter PT1 and the input end i of the function generator module M1 are connected with each other through a power grid frequency parameter transmitter PT3 and a power grid frequency parameter transmitter PT 8 1 Connected to the output O of the function generator module M1 1 And a first input i of multiplier module M3 3 The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M2 2 Connected to the output O of the function generator module M2 2 And a second input i of multiplier module M3 4 Output terminal O of multiplier module M3 3 First input terminal i of and switching module M4 5 Output end O of the setting value module M5 is connected with 4 A second input terminal i of the AND switching module M4 6 A switching end S of the switching module M4 is connected with the primary frequency modulation input signal, and an output end O of the switching module M4 5 Input i of rate generator module M6 7 Connected to the output O of the rate generator module M6 6 Input i of dead zone module M7 8 Connected with the output end O of the dead zone module M7 7 And a first input i of adder module M8 9 The output end of the boiler main control instruction parameter transmitter PT3 is connected with the second input end i of the adder module M8 10 Output terminal O of adder module M8 8 And the new boiler main control instruction parameter transmitter PT4 is connected.
The calculation method of the function generator module M1 is as follows: when the frequency of the power grid is less than or equal to 49.7167HzOutput O 1 When the power grid frequency is equal to or higher than 50.2833Hz, the output O is 1 = -30, in the rest of the cases, output O 1 =0。
The calculation method of the function generator module M2 is as follows: output O 2 X/30, where X is the main vapor pressure value.
The calculation method of the multiplier module M3 is as follows: o (O) 3 =i 3 ×i 4 。
The calculation method of the switching module M4 is as follows: when s=0, O 5 = i 5 When s=1, O 5 = i 6 。
The set value r=0 of the set value module M5, i.e. the output O 4 =0。
The calculation method of the rate generator module M6 is as follows: when inputting the value i 7 When the change occurs, the output value O 6 Gradually changing to the input value i according to the measuring range of 2.5% per second 7 。
The dead zone module M7 is a dead zone module with a dead zone value of 2, i.e. when the input value i 8 When the absolute value of (2) or less, output O 7 When the input value i is =0 8 When the absolute value of (2) is larger than the absolute value of (2), output O 7 = i 8 。
The calculation method of the adder module M8 is as follows: o (O) 8 =i 9 +i 10 。
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 regulation and large main steam pressure deviation 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 the control principle is that on the basis of a conventional primary frequency modulation control strategy at the electric modulation side and a control strategy at the unit coordination side, a primary frequency modulation input signal is formed by combining a primary frequency modulation action time-frequency difference signal into a load signal, a feedforward control loop is introduced and directly overlapped on the output of an original boiler main control loop, thereby more rapidly responding to the change of load, discarding the conventional control thought that the coal quantity and the air quantity water supply quantity are synchronously and proportionally increased during the primary frequency modulation change of the unit, leading the boiler main control to act in advance, limiting the change of the power grid frequency within a certain range, ensuring the high efficiency of the primary frequency modulation function, maintaining the stability of the power grid, simultaneously effectively ensuring that the important parameters of the unit are kept in a safe and stable operation of the unit.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is further illustrated below with reference to specific examples.
A primary frequency modulation feedforward pressure based automatic control system comprising: the system comprises a power grid frequency parameter transmitter PT1, a main steam pressure parameter transmitter PT2, a boiler main control instruction parameter transmitter PT3, a new boiler main control instruction 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 the power grid frequency parameter transmitter PT1 and the input end i of the function generator module M1 are connected with each other through a power grid frequency parameter transmitter PT3 and a power grid frequency parameter transmitter PT 8 1 Connected to the output O of the function generator module M1 1 And a first input i of multiplier module M3 3 The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M2 2 Connected to the output O of the function generator module M2 2 And a second input i of multiplier module M3 4 Output terminal O of multiplier module M3 3 First input terminal i of and switching module M4 5 Output end O of the setting value module M5 is connected with 4 A second input terminal i of the AND switching module M4 6 A switching end S of the switching module M4 is connected with the primary frequency modulation input signal, and an output end O of the switching module M4 5 Input i of rate generator module M6 7 Connected to the output O of the rate generator module M6 6 Input i of dead zone module M7 8 Connected with the output end O of the dead zone module M7 7 And a first input i of adder module M8 9 The output end of the boiler main control instruction parameter transmitter PT3 is connected with the adder module M8A second input terminal i 10 Output terminal O of adder module M8 8 And the new boiler main control instruction parameter transmitter PT4 is connected.
The calculation method of the function generator module M1 is as follows: when the frequency of the power grid is less than or equal to 49.7167Hz, the output O 1 When the power grid frequency is equal to or higher than 50.2833Hz, the output O is 1 = -30, in the rest of the cases, output O 1 =0。
The calculation method of the function generator module M2 is as follows: output O 2 X/30, where X is the main vapor pressure value.
The calculation method of the multiplier module M3 is as follows: o (O) 3 =i 3 ×i 4 。
The calculation method of the switching module M4 is as follows: when s=0, O 5 = i 5 When s=1, O 5 = i 6 。
The set value r=0 of the set value module M5, i.e. the output O 4 =0。
The calculation method of the rate generator module M6 is as follows: when inputting the value i 7 When the change occurs, the output value O 6 Gradually changing to the input value i according to the measuring range of 2.5% per second 7 。
The dead zone module M7 is a dead zone module with a dead zone value of 2, i.e. when the input value i 8 When the absolute value of (2) or less, output O 7 When the input value i is =0 8 When the absolute value of (2) is larger than the absolute value of (2), output O 7 = i 8 。
The calculation method of the adder module M8 is as follows: o (O) 8 =i 9 +i 10 。
The principle of the invention is as follows:
the dead zone module M7 is arranged in the invention, the dead zone value of the dead zone module M7 is 2, the calculation method of the function generator module M1 is adjusted according to the dead zone value in order to ensure the control effectiveness, the power grid frequency of the boiler is 50Hz under normal conditions, and when the power grid frequency is less than or equal to 49.7167Hz, O is output 1 When the power grid frequency is equal to or higher than 50.2833Hz, the output O is 1 = -30, in the rest of the cases, output O 1 =0; since the limit value of the main steam pressure value of the normal boiler is 30MPa, the main steam pressure value of the normal boiler is not equal to the limit value of the main steam pressure valueThe calculation method for setting the function generator module M2 in the invention is as follows: output O 2 =X/30。
The control principle of the invention is that on the basis of a conventional electric tuning 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 superimposed on the output of an original boiler main control loop by introducing a feedforward control loop, so that the change of load is responded more rapidly.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and are not intended to limit the invention. Modifications and improvements to the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications and changes which have been accomplished by those skilled in the art without departing from the spirit and technical spirit of the present invention should be covered by the appended claims.
Claims (9)
1. A primary frequency modulation feedforward pressure based automatic control system, comprising: the system comprises a power grid frequency parameter transmitter PT1, a main steam pressure parameter transmitter PT2, a boiler main control instruction parameter transmitter PT3, a new boiler main control instruction 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 the power grid frequency parameter transmitter PT1 and the input end i of the function generator module M1 are connected with each other through a power grid frequency parameter transmitter PT3 and a power grid frequency parameter transmitter PT 8 1 Connected to the output O of the function generator module M1 1 And a first input i of multiplier module M3 3 The output end of the main steam pressure parameter transmitter PT2 is connected with the input end i of the function generator module M2 2 Connected to the output O of the function generator module M2 2 And a second input i of multiplier module M3 4 Output terminal O of multiplier module M3 3 First input terminal i of and switching module M4 5 Output end O of the setting value module M5 is connected with 4 A second input terminal i of the AND switching module M4 6 Connection, switching module M4The 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 S is connected with a primary frequency modulation input signal 5 Input i of rate generator module M6 7 Connected to the output O of the rate generator module M6 6 Input i of dead zone module M7 8 Connected with the output end O of the dead zone module M7 7 And a first input i of adder module M8 9 The output end of the boiler main control instruction parameter transmitter PT3 is connected with the second input end i of the adder module M8 10 Output terminal O of adder module M8 8 And the new boiler main control instruction parameter transmitter PT4 is connected.
2. The automatic control system for primary frequency modulation based on feedforward pressure according to claim 1, wherein the function generator module M1 calculates the method as follows: when the frequency of the power grid is less than or equal to 49.7167Hz, the output O 1 When the power grid frequency is equal to or higher than 50.2833Hz, the output O is 1 = -30, in the rest of the cases, output O 1 =0。
3. The automatic control system for primary frequency modulation based on feedforward pressure according to claim 2, wherein the function generator module M2 calculates the method as follows: output O 2 X/30, where X is the main vapor pressure value.
4. A primary frequency modulation feedforward pressure based automatic control system according to claim 3, wherein the multiplier module M3 is calculated by: o (O) 3 =i 3 ×i 4 。
5. The automatic control system for primary frequency modulation based on feedforward pressure according to claim 4, wherein the switching module M4 calculates the method as follows: when s=0, O 5 = i 5 When s=1, O 5 = i 6 。
6. A primary frequency modulation feedforward pressure based automatic control system according to claim 5, wherein the setpoint r=0 of the setpoint module M5.
7. The automatic control system for primary frequency modulation based on feedforward pressure according to claim 6, wherein the rate generator module M6 calculates the rate by: when inputting the value i 7 When the change occurs, the output value O 6 Gradually changing to the input value i according to the measuring range of 2.5% per second 7 。
8. The system of claim 7, wherein the deadband module M7 is a deadband module having a deadband value of 2.
9. The automatic control system for primary frequency modulation based on feedforward pressure according to claim 8, wherein the adder module M8 calculates the method as follows: o (O) 8 =i 9 +i 10 。
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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 |
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- 2021-12-04 CN CN202111469139.7A patent/CN114216115B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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