CN105179032A - Coordinated control system for low-heating-value coal generator set - Google Patents
Coordinated control system for low-heating-value coal generator set Download PDFInfo
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Abstract
The invention discloses a coordinated control system for a low-heating-value coal generator set and belongs to the technical field of automatic control over power stations. The coordinated control system for the low-heating-value coal generator set is capable of regulating boiler loads and steam turbine loads quickly and reasonably. According to the technical scheme, the coordinated control system for the low-heating-value coal generator set comprises a boiler regulation and control module, a steam turbine regulation and control module, a load instruction processing module, a generator set operation data measurement module, a main steam pressure set value operation module and a load coordinated control module. The load instruction processing module comprises a set load instruction setting module, a set load speed setting module and a set load variation module. The generator set operation data measurement module comprises a main steam pressure measured value module, a steam pocket pressure measured value module, a regulating stage pressure measured value module and an actual load measured value module. The coordinated control system for the low-heating-value coal generator set is suitable for the application field of power generating boilers.
Description
Technical field
Low calorific value coal generator group coordination and control system of the present invention, belongs to the technical field that power station controls automatically.
Background technique
A large amount of gangue, coal slime can be produced in coal production and washing, wash the low calorific value coal resources such as middle coal, for want of market, there is mining area in long-term heap mostly, due to easy spontaneous combustion, and severe contamination is caused to air, water body and soil, long-distance transportation also can increase the shortcomings such as transport energy consumption, has become the hard nut to crack in mining area, therefore, utilize low calorific value coal to generate electricity and just become the effective means addressed this problem.
Utilizing in low calorific value coal power generation process, due to the dynamic characteristic of low calorific value coal boiler and common pulverized coal fired boiler, to have parameter many, non-linear and purely to delay and except Great inertia feature except same, also also exist and have that input/output variable is many, coupled relation is complicated, steam and the problem such as lag time of accumulation of heat is large, effect is bad, main vapour pressure fluctuation is comparatively large to cause the combustion control system of low calorific value coal boiler automatically to drop into, and then causes low calorific value coal generator group coordination and control system can not bringing normally into operation.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of low calorific value coal generator group coordination and control system that reasonably can regulate boiler load and steam turbine load fast.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
Low calorific value coal generator group coordination and control system, comprising: boiler regulation and control module, steam turbine regulation and control module, load instruction puocessing module and data unit operation measurement module; Described coordinated control system also comprises: main vapour pressure setting value computing module and load coordinated control module; Described load instruction puocessing module comprises: unit load instruction setting module, unit load rate setting module and unit load variation module, and described data unit operation measurement module comprises: main vapour pressure measured value module, drum pressure measured value module, first stage pressure measured value module, actual load measured value module; Described main vapour pressure setting value computing module changes module with described unit load instruction setting module, unit load rate setting module with unit load respectively and is connected; Described load coordinated control module regulates and controls module respectively and regulates and controls module with steam turbine and be connected with described unit load instruction setting module, main vapour pressure measured value module, drum pressure measured value module, first stage pressure measured value module, actual load measured value module, main vapour pressure setting value computing module, boiler.
In the present invention, described main vapour pressure setting value computing module comprises: speed limit module U1, analog amount handover module U2, Changing load-acceleration parameter input module K1, first add computing module U4, first and subtract computing module U5, the first functional operation module U6, pulse module U7, the second functional operation module U8 and the 3rd functional operation module U9; the energy requirement output terminal OUT1 of the described first positive input terminal S1.1 and load coordinated control module subtracting computing module U5 is connected, the boiler heat output terminal OUT2 of the described first negative input end S1.2 and load coordinated control module subtracting computing module U5 is connected, the described first output terminal S1.3 subtracting computing module U5 is connected with the input end of the first functional operation module U6, the output terminal of described first functional operation module U6 is connected with the described first input end A1.2 adding computing module U4, the described first input end A1.1 adding computing module U4 is connected with the output terminal of described unit load rate setting module, described first output terminals A 1.3 adding computing module U4 is connected with the input end Q2 of analog amount handover module U2, the input end Q1 of described analog amount handover module U2 is connected with described Changing load-acceleration parameter input module K1, the input end Q3 of described analog amount handover module U2 is connected with the output terminal of described pulse module U7, input end and the described unit load of described pulse module U7 change module and are connected, the output terminal Q4 of described analog amount handover module U2 is connected with the input end V1.2 of described speed limit module U1, the input end V1.1 of described speed limit module U1 is connected with the output terminal of described unit load instruction setting module, the output terminal V1.3 of described speed limit module U1 and the load instruction input end IN0 of load coordinated control module, the input end of the second functional operation module U8 is all connected, the output terminal of described second functional operation module U8 is connected with the input end of the 3rd functional operation module U9, the output terminal of described 3rd functional operation module U9 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module.
Described load coordinated control module comprises: steam turbine load ordering calculation module and boiler load ordering calculation module, described steam turbine load ordering calculation module comprises: second adds computing module U32, a PD control module U33, the first multiplication module U34, the first differential parameter load module K5, second subtract computing module U36, the first pid control computation module U37, the load instruction input end IN0 of described load coordinated control module adds the input end A2.1 of computing module U32 respectively with described second, the input end of a described PD control module U33 is connected, the described second input end A2.2 adding computing module U32 is connected with the output terminal M1.3 of described first multiplication module U34, the input end M1.2 of described first multiplication module U34 is connected with the first differential parameter load module K5, the input end M1.1 of described first multiplication module U34 is connected with the output terminal of a described PD control module U33, described second output terminals A 2.3 adding computing module U32 is connected with the described second positive input terminal S2.1 subtracting computing module U36, the described second negative input end S2.2 subtracting computing module U36 is connected with described actual load measured value module, the described second output terminal S2.3 subtracting computing module U36 is connected with the input end of the first pid control computation module U37, the output terminal of described first pid control computation module U37 is connected with steam turbine load instruction output end OUT3, described steam turbine load instruction output end OUT3 regulates and controls module with steam turbine and is connected, described boiler load ordering calculation module comprises: the first division operation module U10, the second multiplication module U11, the 3rd subtract that computing module U12, the 3rd adds computing module U13, the 2nd PD control module U14, the 3rd multiplication module U15, drum accumulation of heat parameter input module K2, the second pid control computation module U17, the 4th add computing module U18 and feed-forward signal computing module, the divided scale input end D1.1 of described first division operation module U10, divisor input end D1.2 respectively with the main vapour pressure setting value input end IN1 of described load coordinated control module, main vapour pressure measured value module is connected, the output terminal D1.3 of described first division operation module U10 is connected with the input end M2.1 of the second multiplication module U11, the input end M2.2 of described second multiplication module U11 is connected with described first stage pressure measured value module, the output terminal M2.3 of described second multiplication module U11 respectively with the energy requirement output terminal OUT1 of described load coordinated control module, the 3rd positive input terminal S3.1 subtracting computing module U12 is connected, described first stage pressure measured value module is also connected with the described 3rd input end A3.1 adding computing module U13, the described 3rd input end A3.2 adding computing module U13 is connected with the output terminal M3.3 of described 3rd multiplication module U15, the input end M3.2 of described 3rd multiplication module U15 is connected with drum accumulation of heat parameter input module K2, the input end M3.1 of described 3rd multiplication module U15 is connected with the output terminal of the 2nd PD control module U14, the input end of described 2nd PD control module U14 is connected with drum pressure measured value module, described 3rd output terminals A 3.3 adding computing module U13 respectively with the boiler heat output terminal OUT2 of described load coordinated control module, the 3rd negative input end S3.2 subtracting computing module U12 is connected, the described 3rd output terminal S3.3 subtracting computing module U12 is connected with the input end of the second pid control computation module U17, the output terminal of described second pid control computation module U17 is connected with the described 4th input end A4.1 adding computing module U18, the output terminal OUT5 of the described 4th input end A4.2 and feed-forward signal computing module adding computing module U18 is connected, described 4th output terminals A 4.3 adding computing module U18 is connected with boiler load instruction output end OUT4, and described boiler load instruction output end OUT4 regulates and controls module with boiler and is connected, described feed-forward signal computing module comprises: the 4th subtracts computing module U19, 4th functional operation module U20, slender acanthopanax computing module U21, 3rd PD control module U22, 6th adds computing module U23, 4th multiplication module U24, 7th adds computing module U25, 8th adds computing module U26, 4th PD control module U27, 5th subtracts computing module U28, 5th PD control module U29, 5th multiplication module U30, calorific value correction parameter load module K3, second differential parameter load module K4, the described 4th positive input terminal S4.1 subtracting computing module U19 is connected with unit load instruction setting module, the load instruction input end IN0 of the described 4th negative input end S4.2 and load coordinated control module subtracting computing module U19 is connected, described load instruction input end IN0 also with the input end of the 3rd PD control module U22, the input end M4.1 of the 4th multiplication module U24 is connected, the described 4th output terminal S4.3 subtracting computing module U19 is connected with the input end of the 4th functional operation module U20, the output terminal of described 4th functional operation module U20 is connected with the input end A5.1 of slender acanthopanax computing module U21, the input end A5.2 of described slender acanthopanax computing module U21 is connected with the output terminal of the 3rd PD control module U22, the input end A6.1 that the output terminals A 5.3 and the 6th of described slender acanthopanax computing module U21 adds computing module U23 is connected, the described 6th input end A6.2 adding computing module U23 is connected with the output terminal M4.3 of described 4th multiplication module U24, the input end M4.2 of described 4th multiplication module U24 is connected with calorific value correction parameter load module K3, the input end A7.1 that described 6th output terminals A 6.3 and the 7th adding computing module U23 adds computing module U25 is connected, the described 7th input end A7.2 adding computing module U25 is connected with the output terminal of the 4th PD control module U27, the input end of described 4th PD control module U27 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module, described main vapour pressure setting value input end IN1 also subtracts computing module U28 positive input terminal S5.1 with the 5th is connected, the described 5th negative input end S5.2 subtracting computing module U28 is connected with main vapour pressure measured value module, the described 5th output terminal S5.3 subtracting computing module U28 is connected with the input end of the 5th PD control module U29, the output terminal of described 5th PD control module U29 is connected with the input end M5.1 of the 5th multiplication module U30, the input end M5.2 of described 5th multiplication module U30 is connected with second differential parameter load module K4, the input end A8.2 that the output terminal M5.3 and the 8th of described 5th multiplication module U30 adds computing module U26 is connected, the output terminals A 7.3 that the described 8th input end A8.1 and the 7th adding computing module U26 adds computing module U25 is connected, described 8th output terminals A 8.3 adding computing module U26 is connected with the output terminal OUT5 of described feed-forward signal computing module.
The present invention compared with prior art has following beneficial effect:
The present invention, by the computing between instruction setting module, data unit operation measurement module, main vapour pressure setting value computing module and load coordinated control module, obtains steam turbine load instruction and boiler load instruction; Ensure that low calorific value coal unit under various operating mode, can maintain the stable of unit, the requirement of electrical network to unit load adjustment performance can be met again simultaneously as early as possible; The present invention can reasonably regulate boiler load and steam turbine load fast, avoids the main vapour pressure caused because of load adjustment and fluctuates widely, and the requirement making load variations amplitude and speed all can meet electrical network to examine AGC, practicability are extremely strong.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is electrical block diagram of the present invention;
Fig. 2 is the connection diagram of main vapour pressure setting value computing module in the present invention;
Fig. 3 is the connection diagram of the steam turbine load ordering calculation module in load coordinated control module of the present invention;
Fig. 4 is the connection diagram of the boiler load ordering calculation module in load coordinated control module of the present invention;
Fig. 5 is the modular character figure of the first functional operation module U6 in the present invention;
Fig. 6 is the modular character figure of the second functional operation module U8 in the present invention;
Fig. 7 is the modular character figure of the 3rd functional operation module U9 in the present invention;
Fig. 8 is the modular character figure of the 4th functional operation module U20 in the present invention;
In figure: 1 is boiler regulation and control module, 2 is steam turbine regulation and control module, 3 is load instruction puocessing module, 4 is data unit operation measurement module, 5 is main vapour pressure setting value computing module, 6 is load coordinated control module, 7 is unit load setting module, 8 is unit load rate setting module, 9 is unit load variation module, 10 is main vapour pressure measured value module, 11 is drum pressure measured value module, 12 is first stage pressure measured value module, 13 is actual load measured value module, 14 is steam turbine load ordering calculation module, 15 is boiler load ordering calculation module, 16 is feed-forward signal computing module.
Embodiment
As shown in Figures 1 to 8, low calorific value coal generator group coordination and control system, comprising: boiler regulation and control module 1, steam turbine regulation and control module 2, load instruction puocessing module 3 and data unit operation measurement module 4, main vapour pressure setting value computing module 5 and load coordinated control module 6; Described load instruction puocessing module 3 comprises: unit load setting module 7, unit load rate setting module 8 and unit load variation module 9, and described data unit operation measurement module 4 comprises: main vapour pressure measured value module 10, drum pressure measured value module 11, first stage pressure measured value module 12, actual load measured value module 13; Described main vapour pressure setting value computing module 5 changes module 9 with described unit load setting module 7, unit load rate setting module 8 with unit load respectively and is connected; Described load coordinated control module 6 regulates and controls module 1 respectively and regulates and controls module 2 with steam turbine and be connected with described unit load setting module 7, main vapour pressure measured value module 10, drum pressure measured value module 11, first stage pressure measured value module 12, actual load measured value module 13, main vapour pressure setting value computing module 5, boiler.
The present invention is by the computing between load instruction puocessing module, data unit operation measurement module, main vapour pressure setting value computing module and load coordinated control module, obtain steam turbine load instruction and boiler load instruction, achieve when low calorific value coal unit load changes, control the change of fuel quantity, primary air flow, air output, absorbing quantity etc. according to boiler load instruction in real time, control steam turbine pitch aperture in real time according to steam turbine load instruction; Ensure that low calorific value coal unit under various operating mode, can maintain the stable of unit, the requirement of electrical network to unit load adjustment performance can be met again simultaneously as early as possible.
As shown in Figure 2, described main vapour pressure setting value computing module 5 comprises: speed limit module U1, analog amount handover module U2, Changing load-acceleration parameter input module K1, first add computing module U4, first and subtract computing module U5, the first functional operation module U6, pulse module U7, the second functional operation module U8 and the 3rd functional operation module U9; the energy requirement output terminal OUT1 of the described first positive input terminal S1.1 and load coordinated control module 6 subtracting computing module U5 is connected, the boiler heat output terminal OUT2 of the described first negative input end S1.2 and load coordinated control module 6 subtracting computing module U5 is connected, the described first output terminal S1.3 subtracting computing module U5 is connected with the input end of the first functional operation module U6, the output terminal of described first functional operation module U6 is connected with the described first input end A1.2 adding computing module U4, the described first input end A1.1 adding computing module U4 is connected with the output terminal of described unit load rate setting module 8, described first output terminals A 1.3 adding computing module U4 is connected with the input end Q2 of analog amount handover module U2, the input end Q1 of described analog amount handover module U2 is connected with described Changing load-acceleration parameter input module K1, the input end Q3 of described analog amount handover module U2 is connected with the output terminal of described pulse module U7, input end and the described unit load of described pulse module U7 change module 9 and are connected, the output terminal Q4 of described analog amount handover module U2 is connected with the input end V1.2 of described speed limit module U1, the input end V1.1 of described speed limit module U1 is connected with the output terminal of described unit load instruction setting module 7, the output terminal V1.3 of described speed limit module U1 and the load instruction input end IN0 of load coordinated control module 6, the input end of the second functional operation module U8 is all connected, the output terminal of described second functional operation module U8 is connected with the input end of the 3rd functional operation module U9, the output terminal of described 3rd functional operation module U9 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module 6.
Particularly, unit load variation module 9 is connected with the input end of pulse module U7, at the output terminal of load change initial stage pulse module U7 by the pulse output signals of a generation given pulse width, and access the control input end Q3 of analog amount handover module U2, as Q3=1, the output terminal Q4 of analog amount handover module U2 using the input value of Changing load-acceleration parameter input module K1 as output, and access the speed limit input end V1.2 of speed limit module U1, as the speed limit in load change initial stage certain hour; In the load change later stage, namely, after pulse signal disappears, Q3=0, analog amount handover module U2 then add the output of computing module U4 output terminals A 1.3 as analog amount handover module U2 using first, and access the speed limit input end V1.2 of speed limit module U1, as the speed limit in load change later stage.
Further, the signal that the output terminal V1.3 of described speed limit module U1 exports is load instruction, this load instruction respectively with the load instruction input end IN0 of load coordinated control module 6, the input end of the second functional operation module U8 is connected, access the input end of the 3rd functional operation module U9 as the output signal of the second functional operation module U8 after load instruction is transformed into the main vapour pressure characteristic with load variations by the second functional operation module U8, 3rd functional operation module U9 is that the low calorific value coal boiler arranged according to expertise steams and the process characteristic required for energy storage, the output of described 3rd functional operation module U9 is exactly main vapour pressure duty setting signal, said process completes the computing of main vapour pressure setting value, this main vapour pressure duty setting signal is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module 6 subsequently, participates in the process of steam turbine load ordering calculation, boiler load ordering calculation.
In the present embodiment, described load coordinated control module 6 comprises: steam turbine load ordering calculation module 14 and boiler load ordering calculation module 15;
As shown in Figure 3, described steam turbine load ordering calculation module 14 comprises: second adds computing module U32, a PD control module U33, the first multiplication module U34, the first differential parameter load module K5, second subtract computing module U36, the first pid control computation module U37; the load instruction input end IN0 of described load coordinated control module 6 adds the input end A2.1 of computing module U32 respectively with described second, the input end of a described PD control module U33 is connected, the described second input end A2.2 adding computing module U32 is connected with the output terminal M1.3 of described first multiplication module U34, the input end M1.2 of described first multiplication module U34 is connected with the first differential parameter load module K5, the input end M1.1 of described first multiplication module U34 is connected with the output terminal of a described PD control module U33, described second output terminals A 2.3 adding computing module U32 is connected with the described second positive input terminal S2.1 subtracting computing module U36, the described second negative input end S2.2 subtracting computing module U36 is connected with described actual load measured value module 13, the described second output terminal S2.3 subtracting computing module U36 is connected with the input end of the first pid control computation module U37, the output terminal of described first pid control computation module U37 is connected with steam turbine load instruction output end OUT3, described steam turbine load instruction output end OUT3 regulates and controls module 2 with steam turbine and is connected, in said process, the output terminal of described first pid control computation module U37 is the steam turbine load instruction of low calorific value coal unit, this steam turbine load instruction is as the input signal of steam turbine set regulation and control module 2, make steam turbine regulate and control module 2 and can control steam turbine pitch aperture in real time according to steam turbine load instruction, ensure that low calorific value coal unit can under various operating mode, the stable of unit can be maintained, the requirement of electrical network to unit load adjustment performance can be met again simultaneously as early as possible.
As shown in Figure 4, described boiler load ordering calculation module 15 comprises: the first division operation module U10, the second multiplication module U11, the 3rd subtract that computing module U12, the 3rd adds computing module U13, the 2nd PD control module U14, the 3rd multiplication module U15, drum accumulation of heat parameter input module K2, the second pid control computation module U17, the 4th add computing module U18 and feed-forward signal computing module 16, the divided scale input end D1.1 of described first division operation module U10, divisor input end D1.2 respectively with the main vapour pressure setting value input end IN1 of described load coordinated control module 6, main vapour pressure measured value module 10 is connected, the output terminal D1.3 of described first division operation module U10 is connected with the input end M2.1 of the second multiplication module U11, the input end M2.2 of described second multiplication module U11 is connected with described first stage pressure measured value module 12, the output terminal M2.3 of described second multiplication module U11 respectively with the energy requirement output terminal OUT1 of described load coordinated control module 6, the 3rd positive input terminal S3.1 subtracting computing module U12 is connected, described first stage pressure measured value module 12 is also connected with the described 3rd input end A3.1 adding computing module U13, the described 3rd input end A3.2 adding computing module U13 is connected with the output terminal M3.3 of described 3rd multiplication module U15, the input end M3.2 of described 3rd multiplication module U15 is connected with drum accumulation of heat parameter input module K2, the input end M3.1 of described 3rd multiplication module U15 is connected with the output terminal of the 2nd PD control module U14, the input end of described 2nd PD control module U14 is connected with drum pressure measured value module 11, described 3rd output terminals A 3.3 adding computing module U13 respectively with the boiler heat output terminal OUT2 of described load coordinated control module 6, the 3rd negative input end S3.2 subtracting computing module U12 is connected, the described 3rd output terminal S3.3 subtracting computing module U12 is connected with the input end of the second pid control computation module U17, the output terminal of described second pid control computation module U17 is connected with the described 4th input end A4.1 adding computing module U18, the output terminal OUT5 of the described 4th input end A4.2 and feed-forward signal computing module 16 adding computing module U18 is connected, described 4th output terminals A 4.3 adding computing module U18 is connected with boiler load instruction output end OUT4, and described boiler load instruction output end OUT4 regulates and controls module 1 with boiler and is connected,
Further, described feed-forward signal computing module 16 comprises: the 4th subtracts computing module U19, the 4th functional operation module U20, slender acanthopanax computing module U21, the 3rd PD control module U22, the 6th add computing module U23, the 4th multiplication module U24, the 7th adds that computing module U25, the 8th adds computing module U26, the 4th PD control module U27, the 5th subtracts computing module U28, the 5th PD control module U29, the 5th multiplication module U30, calorific value correction parameter load module K3, second differential parameter load module K4; the described 4th positive input terminal S4.1 subtracting computing module U19 is connected with unit load instruction setting module 7, the load instruction input end IN0 of the described 4th negative input end S4.2 and load coordinated control module 6 subtracting computing module U19 is connected, described load instruction input end IN0 also with the input end of the 3rd PD control module U22, the input end M4.1 of the 4th multiplication module U24 is connected, the described 4th output terminal S4.3 subtracting computing module U19 is connected with the input end of the 4th functional operation module U20, the output terminal of described 4th functional operation module U20 is connected with the input end A5.1 of slender acanthopanax computing module U21, the input end A5.2 of described slender acanthopanax computing module U21 is connected with the output terminal of the 3rd PD control module U22, the input end A6.1 that the output terminals A 5.3 and the 6th of described slender acanthopanax computing module U21 adds computing module U23 is connected, the described 6th input end A6.2 adding computing module U23 is connected with the output terminal M4.3 of described 4th multiplication module U24, the input end M4.2 of described 4th multiplication module U24 is connected with calorific value correction parameter load module K3, the input end A7.1 that described 6th output terminals A 6.3 and the 7th adding computing module U23 adds computing module U25 is connected, the described 7th input end A7.2 adding computing module U25 is connected with the output terminal of the 4th PD control module U27, the input end of described 4th PD control module U27 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module 6, described main vapour pressure setting value input end IN1 also subtracts computing module U28 positive input terminal S5.1 with the 5th is connected, the described 5th negative input end S5.2 subtracting computing module U28 is connected with main vapour pressure measured value module 10, the described 5th output terminal S5.3 subtracting computing module U28 is connected with the input end of the 5th PD control module U29, the output terminal of described 5th PD control module U29 is connected with the input end M5.1 of the 5th multiplication module U30, the input end M5.2 of described 5th multiplication module U30 is connected with second differential parameter load module K4, the input end A8.2 that the output terminal M5.3 and the 8th of described 5th multiplication module U30 adds computing module U26 is connected, the output terminals A 7.3 that the described 8th input end A8.1 and the 7th adding computing module U26 adds computing module U25 is connected, described 8th output terminals A 8.3 adding computing module U26 is connected with the output terminal OUT5 of described feed-forward signal computing module 16.
In the present embodiment, the input end of described 2nd PD control module U14 is connected with drum pressure measured value module 11, the signal that the output terminal of described 2nd PD control module U14 exports is drum pressure pace of change, the drum heat storage coefficient exported with drum accumulation of heat parameter input module K2 does product calculation by the 3rd multiplication module U15, the output terminal M3.3 of the 3rd multiplication module U15 is connected to the input end A3.2 that the 3rd adds computing module U13, the 3rd input end A3.1 adding computing module U13 is first stage pressure measured value module 12 input value, 3rd output signal adding the output terminals A 3.3 of computing module U13 is low calorific value coal boiler heat, the output terminal access the 3rd of the second multiplication module U11 subtracts the positive input terminal S3.1 of computing module U12,3rd adds computing module U13 output terminals A 3.3 accesses the negative input end S3.2 that the 3rd subtracts computing module U12, the energy deviation of what the 3rd output terminal S3.3 subtracting computing module U12 obtained is low calorific value coal boiler, this energy deviation signal accesses the input end of the second pid control computation module U17, the energy feedback control signal exported after the control algorithm of the second pid control computation module U17 is connected to the 4th and adds computing module U18 input end A4.1,4th another road input end A4.2 adding computing module U18 connects the feed-forward control signals that feed-forward signal computing module 16 is sent here, and described feed-forward control signals is added by 5 road signals and obtains, the boiler load instruction being low calorific value coal unit that 4th output terminals A 4.3 adding computing module U18 exports, this boiler load instruction is as the input signal of boiler regulation and control module 1, make boiler regulation and control module 1 can control the change of fuel quantity, primary air flow, air output, absorbing quantity etc. in time according to boiler load instruction, ensure that low calorific value coal unit can under various operating mode, the stable of unit can be maintained, the requirement of electrical network to unit load adjustment performance can be met again simultaneously as early as possible.
Particularly, Fig. 5 to Fig. 6 is respectively: the modular character figure of the first functional operation module U6, the modular character figure of the second functional operation module U8, the modular character figure of the 3rd functional operation module U9, the modular character figure of the 4th functional operation module U20, in figure: i represents input, o represents output;
Further, all available formula (1) of the modular character of a PD control module U33, the 2nd PD control module U14, the 3rd PD control module U22, the 4th PD control module U27, the 5th PD control module U29 is expressed as follows:
In formula (1): o is output value, i is input value, k
1for proportional gain factor, k
2it is DG Differential Gain coefficient;
The modular character of a described PD control module U37, the second pid control computation module U17 all can be formulated as follows:
In formula (2): o is output value, i is input value, k
1for proportional gain factor, k
2integration gain factor, k
3for DG Differential Gain coefficient.
To sum up, the invention solves low calorific value coal unit load coordinated control system and adapt to the technical barrier in AGC examination process, avoid the main vapour pressure caused because of load adjustment to fluctuate widely, the requirement making load variations amplitude and speed all can meet electrical network to examine AGC, has outstanding substantive distinguishing features and significant progressive; By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (3)
1. low calorific value coal generator group coordination and control system, comprising: boiler regulation and control module (1), steam turbine regulation and control module (2), load instruction puocessing module (3) and data unit operation measurement module (4); It is characterized in that: described coordinated control system also comprises: main vapour pressure setting value computing module (5) and load coordinated control module (6);
Described load instruction puocessing module (3) comprising: unit load instruction setting module (7), unit load rate setting module (8) and unit load variation module (9), and described data unit operation measurement module (4) comprising: main vapour pressure measured value module (10), drum pressure measured value module (11), first stage pressure measured value module (12), actual load measured value module (13);
Described main vapour pressure setting value computing module (5) changes module (9) with described unit load instruction setting module (7), unit load rate setting module (8) and unit load respectively and is connected;
Described load coordinated control module (6) regulates and controls module (1) respectively and regulates and controls module (2) with steam turbine and be connected with described unit load instruction setting module (7), main vapour pressure measured value module (10), drum pressure measured value module (11), first stage pressure measured value module (12), actual load measured value module (13), main vapour pressure setting value computing module (5), boiler.
2. low calorific value coal generator group coordination and control system according to claim 1, is characterized in that: described main vapour pressure setting value computing module (5) comprising: speed limit module U1, analog amount handover module U2, Changing load-acceleration parameter input module K1, first add computing module U4, first and subtract computing module U5, the first functional operation module U6, pulse module U7, the second functional operation module U8 and the 3rd functional operation module U9;
The energy requirement output terminal OUT1 of the described first positive input terminal S1.1 and load coordinated control module (6) subtracting computing module U5 is connected, the boiler heat output terminal OUT2 of the described first negative input end S1.2 and load coordinated control module (6) subtracting computing module U5 is connected, the described first output terminal S1.3 subtracting computing module U5 is connected with the input end of the first functional operation module U6, the output terminal of described first functional operation module U6 is connected with the described first input end A1.2 adding computing module U4, the described first input end A1.1 adding computing module U4 is connected with the output terminal of described unit load rate setting module (8), described first output terminals A 1.3 adding computing module U4 is connected with the input end Q2 of analog amount handover module U2, the input end Q1 of described analog amount handover module U2 is connected with described Changing load-acceleration parameter input module K1, the input end Q3 of described analog amount handover module U2 is connected with the output terminal of described pulse module U7, input end and the described unit load of described pulse module U7 change module (9) and are connected, the output terminal Q4 of described analog amount handover module U2 is connected with the input end V1.2 of described speed limit module U1, the input end V1.1 of described speed limit module U1 is connected with the output terminal of described unit load instruction setting module (7), the output terminal V1.3 of described speed limit module U1 and the load instruction input end IN0 of load coordinated control module (6), the input end of the second functional operation module U8 is all connected, the output terminal of described second functional operation module U8 is connected with the input end of the 3rd functional operation module U9, the output terminal of described 3rd functional operation module U9 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module (6).
3. low calorific value coal generator group coordination and control system according to claim 1, is characterized in that: described load coordinated control module (6) comprising: steam turbine load ordering calculation module (14) and boiler load ordering calculation module (15);
Described steam turbine load ordering calculation module (14) comprising: second adds computing module U32, a PD control module U33, the first multiplication module U34, the first differential parameter load module K5, second subtract computing module U36, the first pid control computation module U37;
The load instruction input end IN0 of described load coordinated control module (6) adds the input end A2.1 of computing module U32 respectively with described second, the input end of a described PD control module U33 is connected, the described second input end A2.2 adding computing module U32 is connected with the output terminal M1.3 of described first multiplication module U34, the input end M1.2 of described first multiplication module U34 is connected with the first differential parameter load module K5, the input end M1.1 of described first multiplication module U34 is connected with the output terminal of a described PD control module U33, described second output terminals A 2.3 adding computing module U32 is connected with the described second positive input terminal S2.1 subtracting computing module U36, the described second negative input end S2.2 subtracting computing module U36 is connected with described actual load measured value module (13), the described second output terminal S2.3 subtracting computing module U36 is connected with the input end of the first pid control computation module U37, the output terminal of described first pid control computation module U37 is connected with steam turbine load instruction output end OUT3, described steam turbine load instruction output end OUT3 and steam turbine regulate and control module (2) and are connected,
Described boiler load ordering calculation module (15) comprising: the first division operation module U10, the second multiplication module U11, the 3rd subtract that computing module U12, the 3rd adds computing module U13, the 2nd PD control module U14, the 3rd multiplication module U15, drum accumulation of heat parameter input module K2, the second pid control computation module U17, the 4th add computing module U18 and feed-forward signal computing module (16);
The divided scale input end D1.1 of described first division operation module U10, divisor input end D1.2 respectively with the main vapour pressure setting value input end IN1 of described load coordinated control module (6), main vapour pressure measured value module (10) is connected, the output terminal D1.3 of described first division operation module U10 is connected with the input end M2.1 of the second multiplication module U11, the input end M2.2 of described second multiplication module U11 is connected with described first stage pressure measured value module (12), the output terminal M2.3 of described second multiplication module U11 respectively with the energy requirement output terminal OUT1 of described load coordinated control module (6), the 3rd positive input terminal S3.1 subtracting computing module U12 is connected, described first stage pressure measured value module (12) is also connected with the described 3rd input end A3.1 adding computing module U13, the described 3rd input end A3.2 adding computing module U13 is connected with the output terminal M3.3 of described 3rd multiplication module U15, the input end M3.2 of described 3rd multiplication module U15 is connected with drum accumulation of heat parameter input module K2, the input end M3.1 of described 3rd multiplication module U15 is connected with the output terminal of the 2nd PD control module U14, the input end of described 2nd PD control module U14 is connected with drum pressure measured value module (11), described 3rd output terminals A 3.3 adding computing module U13 respectively with the boiler heat output terminal OUT2 of described load coordinated control module (6), the 3rd negative input end S3.2 subtracting computing module U12 is connected, the described 3rd output terminal S3.3 subtracting computing module U12 is connected with the input end of the second pid control computation module U17, the output terminal of described second pid control computation module U17 is connected with the described 4th input end A4.1 adding computing module U18, the described 4th input end A4.2 adding computing module U18 is connected with the output terminal OUT5 of feed-forward signal computing module (16), described 4th output terminals A 4.3 adding computing module U18 is connected with boiler load instruction output end OUT4, and described boiler load instruction output end OUT4 and boiler regulate and control module (1) and be connected,
Described feed-forward signal computing module (16) comprising: the 4th subtracts computing module U19, 4th functional operation module U20, slender acanthopanax computing module U21, 3rd PD control module U22, 6th adds computing module U23, 4th multiplication module U24, 7th adds computing module U25, 8th adds computing module U26, 4th PD control module U27, 5th subtracts computing module U28, 5th PD control module U29, 5th multiplication module U30, calorific value correction parameter load module K3, second differential parameter load module K4,
The described 4th positive input terminal S4.1 subtracting computing module U19 is connected with unit load instruction setting module (7), the load instruction input end IN0 of the described 4th negative input end S4.2 and load coordinated control module (6) subtracting computing module U19 is connected, described load instruction input end IN0 also with the input end of the 3rd PD control module U22, the input end M4.1 of the 4th multiplication module U24 is connected, the described 4th output terminal S4.3 subtracting computing module U19 is connected with the input end of the 4th functional operation module U20, the output terminal of described 4th functional operation module U20 is connected with the input end A5.1 of slender acanthopanax computing module U21, the input end A5.2 of described slender acanthopanax computing module U21 is connected with the output terminal of the 3rd PD control module U22, the input end A6.1 that the output terminals A 5.3 and the 6th of described slender acanthopanax computing module U21 adds computing module U23 is connected, the described 6th input end A6.2 adding computing module U23 is connected with the output terminal M4.3 of described 4th multiplication module U24, the input end M4.2 of described 4th multiplication module U24 is connected with calorific value correction parameter load module K3, the input end A7.1 that described 6th output terminals A 6.3 and the 7th adding computing module U23 adds computing module U25 is connected, the described 7th input end A7.2 adding computing module U25 is connected with the output terminal of the 4th PD control module U27, the input end of described 4th PD control module U27 is connected with the main vapour pressure setting value input end IN1 of described load coordinated control module (6), described main vapour pressure setting value input end IN1 also subtracts computing module U28 positive input terminal S5.1 with the 5th is connected, the described 5th negative input end S5.2 subtracting computing module U28 is connected with main vapour pressure measured value module (10), the described 5th output terminal S5.3 subtracting computing module U28 is connected with the input end of the 5th PD control module U29, the output terminal of described 5th PD control module U29 is connected with the input end M5.1 of the 5th multiplication module U30, the input end M5.2 of described 5th multiplication module U30 is connected with second differential parameter load module K4, the input end A8.2 that the output terminal M5.3 and the 8th of described 5th multiplication module U30 adds computing module U26 is connected, the output terminals A 7.3 that the described 8th input end A8.1 and the 7th adding computing module U26 adds computing module U25 is connected, described 8th output terminals A 8.3 adding computing module U26 is connected with the output terminal OUT5 of described feed-forward signal computing module (16).
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