CN109343409B - Auxiliary control system and method for primary frequency modulation of full-cycle steam inlet unit - Google Patents
Auxiliary control system and method for primary frequency modulation of full-cycle steam inlet unit Download PDFInfo
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Abstract
The invention provides an auxiliary control system and method for primary frequency modulation of a full-cycle steam turbine unit, comprising a primary frequency modulation capacity judging unit and a condensate water throttling rapid load-changing control unit in the current state of the unit, wherein the input end of the primary frequency modulation capacity judging unit in the current state of the unit is input with the valve opening of a turbine of the current unit, the deviation between the actual main steam pressure and a set value and a power grid primary frequency modulation power increment instruction; the output end of the primary frequency modulation capacity judging unit is connected with the condensate water throttling rapid load-changing control unit in the current state of the unit; the throttle energy storage utilization is precisely controlled by quickly adjusting the condensate flow, and meanwhile, the pressure controlled by the machine furnace side is relieved by decomposing the instruction, so that a better dynamic control effect is obtained.
Description
Technical Field
The invention belongs to the field of control of thermal power generating units, and particularly relates to an auxiliary control system and method for primary frequency modulation of a full-cycle steam turbine unit.
Background
In order to further improve the running economy of the thermal power generating unit and reduce the power generation coal consumption of the unit, the unit often adopts a sliding pressure running mode in the running process, namely: the valve opening of the steam turbine is opened as much as possible to avoid throttling loss in the steam inlet process. In particular to a full-cycle steam turbine unit, as the full-cycle steam turbine unit adopts two groups of high-speed regulating gates in the design process and the two groups of valves synchronously act in the load regulating process, in order to pursue economy of unit operation, the full-cycle steam turbine unit is often in a deep sliding pressure control mode, and the opening degree of the steam turbine valve is almost close to a full-open state, so that the economy is improved at the moment, but the operation flexibility of the thermal power unit is greatly reduced.
Particularly, with the access of large-scale new energy power in China, in order to restrain the influence of new energy power fluctuation on the running stability of a power grid, a thermal power unit needs to frequently participate in primary frequency modulation and rapid peak regulation processes, and at the moment, the primary frequency modulation requirement of the power grid is difficult to be met by a full-cycle steam turbine unit under the condition of high valve opening.
Disclosure of Invention
The invention aims to provide an auxiliary control system and method for primary frequency modulation of a full-cycle steam turbine set, which solve the defect that the primary frequency modulation capability of the existing set is insufficient in the deep sliding pressure operation process and cannot meet the primary frequency modulation assessment requirement of a power grid.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides an auxiliary control system for primary frequency modulation of a full-cycle admission turbine unit, which comprises a primary frequency modulation capacity judging unit and a condensate water throttling rapid load-changing control unit in the current state of the unit, wherein,
the input end of the primary frequency modulation capacity judging unit in the current state of the unit is input with the current valve opening of the turbine of the unit, the deviation between the actual main steam pressure and a set value and the primary frequency modulation power increment instruction of the power grid; the output end of the primary frequency modulation capacity judging unit is connected with the condensate water throttling rapid load-changing control unit in the current state of the unit.
Preferably, the primary frequency modulation capacity judging unit in the current state of the unit comprises a first judging block, a first AND gate block, a second judging block, a second AND gate block, a first NOT gate block, a third judging block, a first difference block, a first OR gate block and an RS trigger, wherein the opening of a steam turbine valve is connected to the input end of the first judging block, and the output end of the first judging block is connected with the first AND gate block;
the primary frequency modulation power increment instruction is connected to the input end of a second judgment block, the output end of the second judgment block is connected with the input ends of a first AND gate block, a second AND gate block and a first NOT gate block, and the output end of the first NOT gate block is connected with the reset end R end of the RS trigger;
the deviation between the actual main steam pressure and the set value is connected to the input end of a third judgment block, and the output end of the third judgment block is connected to the input end of a second AND gate block;
the output ends of the first AND gate block and the second AND gate block are respectively connected with the input end of the first OR gate block, and the output end of the first OR gate block is connected with the trigger end S end of the RS trigger; the output end of the RS trigger is connected with a condensate water throttling rapid load-changing control unit.
Preferably, the condensate water throttling rapid load-changing control unit comprises a function F (x) module, a first selection block and a first addition block, wherein a primary frequency modulation power increment instruction is connected to the input end of the function F (x) module, and the output end of the function F (x) module is connected to the input end of the first selection block;
the throttle trigger signal and the constant are both connected with the input end of the first selection block, the output end of the first selection block is connected with the input end of the first addition block, and the output of the first addition block is used as a condensing pump frequency converter instruction.
An auxiliary control method for primary frequency modulation of a full-cycle steam turbine set is based on the auxiliary control system for primary frequency modulation of the full-cycle steam turbine set, and comprises the following steps:
and constructing a condensate water throttling trigger signal h of the auxiliary unit primary frequency modulation according to the valve opening of the turbine of the current unit, the deviation between the actual main steam pressure and the set value and the power grid primary frequency modulation power increment instruction, inputting the condensate water throttling trigger signal h into a condensate water throttling rapid load-changing control unit, and performing switching control by using the condensate water throttling rapid load-changing control unit as judgment.
Preferably, the concrete method for constructing the condensation water throttling trigger signal h of the primary frequency modulation of the auxiliary unit is as follows:
first, upper and lower limit values of the opening degree of a turbine valve of a unit turbine are set in a first judgment block, upper and lower limit values of a primary frequency modulation power increment command are set in a second judgment block, upper and lower limit values of a deviation between an actual main steam pressure and a set value are set in a third judgment block,
if the current valve opening value of the unit turbine is smaller than the set upper limit value of the valve opening of the unit turbine and larger than the set lower limit value of the valve opening of the unit turbine, the logic signal a output by the first judging block is 0;
if the current valve opening value of the unit turbine is larger than the set upper limit value of the valve opening of the unit turbine or smaller than the set lower limit value of the valve opening of the unit turbine, the logic signal a output by the first judging block is 1;
if the primary frequency modulation power increment instruction value is smaller than the set primary frequency modulation power increment instruction upper limit value and larger than the set primary frequency modulation power increment instruction lower limit value, the logic signal b output by the second judging block is 0;
if the primary frequency modulation power increment instruction value is larger than the set primary frequency modulation power increment instruction upper limit value or smaller than the set primary frequency modulation power increment instruction lower limit value, the logic signal b output by the second judging block is 1;
if the deviation value between the actual main steam pressure and the set value is smaller than the upper deviation limit value between the set actual main steam pressure and the set value and is larger than the lower deviation limit value between the set actual main steam pressure and the set value, the logic signal c output by the third judging block is 0;
if the deviation value between the actual main steam pressure and the set value is larger than the upper deviation limit value between the set actual main steam pressure and the set value or smaller than the lower deviation limit value between the set actual main steam pressure and the set value, the logic signal c output by the third judging block is 1;
secondly, inputting a logic signal a and a logic signal b into a first AND gate block for performing AND calculation, and outputting a logic signal e by the first AND gate block;
inputting the logic signal b into a first NOT gate block for inversion calculation, and outputting a logic signal d by the first NOT gate block;
inputting the logic signal b and the logic signal c into a second AND gate block for AND calculation, and outputting a logic signal f by the second AND gate block;
inputting a logic signal e and a logic signal f into a first OR gate block to perform OR judgment, wherein the first OR gate block outputs a logic signal g;
then, the following steps are carried out; the logic signal g is used as the S end input of the RS trigger, and the logic signal d is used as the R end input of the RS trigger;
finally, the RS trigger triggers and resets the logic signal g and the logic signal d, and the RS trigger outputs a condensate water throttling trigger signal h; when the S input end and the R input end of the RS trigger are both 0, the RS trigger is kept in an original state; when the S input end of the RS trigger is 1 and the R input end of the RS trigger is 0, the condensed water throttling trigger signal h output by the RS trigger is 1; when the R input end is 1 and the S input end is 0, the condensed water throttling trigger signal h output by the RS trigger is 0.
Preferably, the concrete method for performing switching control by using the signal as a judgment by the condensate water throttling rapid load-changing control unit is as follows:
firstly, inputting primary frequency modulation power increment into a function F (x) module, and outputting a frequency difference instruction of a coagulation pump frequency converter by the function F (x) module;
then, inputting a condensate water throttling trigger signal h to an En end on a first selection block, and respectively inputting a constant and a frequency difference instruction of a condensate pump frequency converter to a selection end In1 and a selection end In2 of the first selection block; when the condensation water throttling trigger signal h received by the En is 1, the selection end In2 of the first selection block is used as the input end of the first addition block; when the condensation water throttling trigger signal h received by the En is 0, the selection end In1 of the first selection block is used as the input end of the first addition block;
and then, inputting the original condensing pump frequency converter instruction into a first adding block, and carrying out summation calculation with the output signal of the first selecting block, wherein the first adding block outputs the condensing pump frequency converter instruction, so that auxiliary adjustment of primary frequency modulation is realized.
Compared with the prior art, the invention has the beneficial effects that:
according to the auxiliary control system for primary frequency modulation of the full-cycle steam turbine unit, the frequency modulation load instruction sent to the unit coordination control system is not limited by the variable load rate of the unit, however, the quick tracking of the frequency modulation load instruction cannot be completely realized due to the influence of the large delay inertia of the boiler side on the steam turbine regulating gate, and the quick response load of the boiler side generally adopts an overfire strategy, so that the load fluctuation of the unit is large in the regulating process;
and because the condensate water throttling is faster in response speed compared with the machine furnace side, the throttle energy storage utilization can be accurately controlled by quickly adjusting the condensate water flow, and meanwhile, the pressure controlled by the machine furnace side is relieved by decomposing the instruction, so that a better dynamic control effect is obtained.
Drawings
FIG. 1 is a primary frequency modulation assisted adjustment trigger logic;
FIG. 2 is primary frequency modulation auxiliary regulation control logic;
fig. 3 is a graph showing a comparison of the throttling effect of the condensed water.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a primary frequency modulation auxiliary control system of a full-cycle steam inlet unit.
As shown in fig. 1, the auxiliary control system for primary frequency modulation of a full-cycle steam turbine set provided by the invention comprises a primary frequency modulation capacity judging unit and a condensate water throttling rapid load-changing control unit for controlling the current state of the set, wherein,
the primary frequency modulation capability judging unit in the current state of the unit is a trigger signal for controlling the auxiliary regulating means of the condensate water throttling, and comprises a first judging block, a first AND gate block, a second judging block, a second AND gate block, a first NOT gate block, a third judging block, a first difference block, a first OR gate block and an RS trigger,
wherein, the judging block compares the input quantity with the high/low limit value and outputs the switching value 1 beyond the range; the AND gate block is the AND calculation in the logic operation; the NOT gate block is the negation calculation in the logic calculation; OR gate blocks are the OR operations within the logical computations; the difference block is a subtraction operation;
the opening of the steam turbine valve is connected with a first judging block, and the output of the first judging block is connected with a first AND gate block;
the primary frequency modulation power increment instruction is connected with a second judgment block, the output of the second judgment block is respectively connected with a first AND gate block, a second AND gate block and a first NOT gate block, and the output of the first NOT gate block is connected with the reset end R end of the RS trigger;
the actual main steam pressure and the main steam pressure set value are connected into a first difference block, the output of the first difference block is connected with a third judgment block, and the output of the third judgment block is connected with a second AND gate block;
the output of the first AND gate block and the output of the second AND gate block are both connected with the first OR gate block, and the output of the first OR gate block is connected with the trigger end S of the RS trigger; the RS flip-flop outputs a throttle trigger switching value signal h.
Wherein: the first judgment block, the second judgment block and the third judgment block judge the received signal value, and output 0 if the received signal value is smaller than or equal to the set upper limit value and larger than the set lower limit value, and output 1 if the received signal value is larger than the set upper limit value or smaller than the set lower limit value;
when all the input ends of the first AND gate block and the second AND gate block are connected with 1, the output is 1, and when any one of the input ends is 0, the output is 0;
the first NOT gate block inverts an access signal, outputs 0 when the input is 1, and outputs 1 when the input is 0;
outputting 0 when all access ends of the first OR gate block are 0, and outputting 1 when any access end is 1;
the output of the first difference block is the difference between the value of the input end In1 and the value of the input end In2;
in fig. 1, a logic signal a indicates that the opening of the valve of the steam turbine is compared with an upper limit value and a lower limit value set by a module, wherein the upper limit value set by the module is 55, and is a saturation region limit of the opening of the valve of the steam turbine; the lower limit value set by the module is 0, and the specific logic relation is as follows:
if the valve opening value of the steam turbine is smaller than the set upper limit value and larger than the set lower limit value, the logic signal a is 0; if the valve opening value of the steam turbine is larger than the set upper limit value or smaller than the set lower limit value, the logic signal a is 1.
The logic signal b represents that the primary frequency modulation power increment instruction is compared with the upper limit value and the lower limit value set by the module, the upper limit value of the second judging block is set to be 2MW, the lower limit value set value is-2 MW, and the specific logic relation is as follows:
if the primary frequency modulation power increment instruction value is smaller than the set upper limit value and larger than the set lower limit value, the logic signal b is 0; if the primary frequency modulation power increment command value is greater than the set upper limit value or less than the set lower limit value, the logic signal b is 1.
The logic signal c represents that the deviation of the set value of the main steam pressure and the actual main steam pressure is compared with the upper limit value and the lower limit value set by the module, the upper limit value of the third judging block is set to be 0.4Mpa, the lower limit value is set to be-0.4 Mpa, and the specific logic relationship is as follows:
if the set value of the main steam pressure and the deviation value of the actual main steam pressure are smaller than the set upper limit value and larger than the set lower limit value, the logic signal c is 0; if the set value of the main steam pressure and the deviation value of the actual main steam pressure are larger than the set upper limit value or smaller than the set lower limit value, the logic signal c is 1;
the logic signal d represents the inversion of the logic signal b, and the specific logic relationship is as follows:
the logic signal e represents the AND calculation of the logic signal a and the logic signal b, and the specific logic relationship is as follows: e=a.cndot.b.
The logic signal f represents and judges the logic signal b and the logic signal c, and the specific logic relationship is as follows: f=bjc.
The logic signal g is used for solving or judging the logic signal e and the logic signal f, and the specific logic relationship is as follows: g=e ≡f
The logic signal h is used for triggering and resetting the logic signal g and the logic signal d, and the specific logic relationship is as follows: when the S input end and the R input end of the RS trigger are both 0, the RS trigger is kept in an original state; when the S input end of the RS trigger is 1 and the R input end of the RS trigger is 0, the output of the RS trigger is 1; when the R input terminal is 1 and the S input terminal is 0, the output of the RS trigger is 0.
As shown in fig. 2, the condensate water throttling rapid load change control unit includes a function F (x) module, a first selection block and a first addition block, wherein,
the primary frequency modulation power increment instruction is connected with a function F (x) module, namely the primary frequency modulation power increment instruction is converted into a frequency difference instruction of a coagulation pump frequency converter, F (x) is generally set into a linear function relation, in the example, F (x) =0.8×dNE, wherein dNE is the primary frequency modulation power increment instruction, and the output of the function F (x) module is connected with a first selection block;
the throttle trigger signal and the constant 0 are both connected with a first selection block, the output of the first selection block is connected with a first addition block, the first addition block receives the output of the first selection block and the set original coagulation pump frequency converter instruction, and the output of the first addition block is used as the coagulation pump frequency converter instruction, so that the regulation and control effects are achieved.
The function F (x) module converts the received input signals into output through a set function relation;
the first selection block enable end En receives the switching value signal, the selection end In1 and the selection end In2 receive analog value signals, and when the enable end En is the switching value 1, the output end selects In2 as output; when the enable terminal En is the switching value 0, the output terminal selects In1 as the output.
The first adding block is the value of the input end In1 plus the value of the input end In2;
when the throttle trigger switching value signal is 0, the output of the first selection module is 0, the instruction of the condensate pump frequency converter is kept unchanged, and the condensate water throttle auxiliary regulating system does not act;
when the throttle trigger switching value signal is 1, the first selection module selects the output of the function F (x) module as the output of the first selection module, and the coagulation pump frequency converter instruction is superimposed with the output of the function F (x) module on the basis of the original instruction, so that the auxiliary adjustment of primary frequency modulation is realized.
The invention has the beneficial effects that for the full-cycle steam turbine set, when the valve is close to a saturation region or the main steam pressure deviates from a set value greatly, and the check requirement of a power grid on primary frequency modulation of the set cannot be met, the control quality of the primary frequency modulation of the set can be improved by adopting a condensate water throttling rapid load-changing auxiliary adjustment means.
As shown in fig. 3, the reason for this is that: the frequency modulation load instruction sent to the unit coordination control system is not limited by the variable load rate of the unit, however, the quick tracking of the frequency modulation load instruction cannot be completely realized due to the influence of the large delay inertia of the boiler side, and the overfire strategy is generally adopted for the quick response load of the boiler side, so that the load fluctuation of the unit is large in the adjustment process; compared with the machine furnace side, the condensation water throttling has the advantages that the response speed is faster, the throttling energy storage utilization can be precisely controlled by quickly adjusting the condensation water flow, meanwhile, the pressure controlled by the machine furnace side is relieved by decomposing the instruction, and therefore a better dynamic control effect is achieved.
Claims (4)
1. An auxiliary control method for primary frequency modulation of a full-cycle steam inlet unit is characterized by comprising a primary frequency modulation capacity judging unit, a condensate water throttling rapid load-changing control unit and a DCS boiler main control system based on the auxiliary control system of the primary frequency modulation of the full-cycle steam inlet unit in the current state of the unit,
the input end of the primary frequency modulation capacity judging unit in the current state of the unit is input with the current valve opening of the turbine of the unit, the deviation between the actual main steam pressure and a set value and the primary frequency modulation power increment instruction of the power grid; the output end of the primary frequency modulation capacity judging unit is connected with the input end of the condensate water throttling rapid load-changing control unit in the current state of the unit, and the output end of the condensate water throttling rapid load-changing control unit is connected with the DCS boiler main control system;
the method comprises the following steps:
constructing a condensate water throttling trigger signal h of auxiliary unit primary frequency modulation according to the valve opening of a turbine of the current unit, the deviation between the actual main steam pressure and a set value and a power grid primary frequency modulation power increment instruction, inputting the condensate water throttling trigger signal h into a condensate water throttling rapid load-changing control unit, and performing switching control by using the condensate water throttling rapid load-changing control unit as judgment;
the concrete method for constructing the condensation water throttling trigger signal h of the auxiliary unit primary frequency modulation is as follows:
first, upper and lower limit values of the opening degree of a turbine valve of a unit turbine are set in a first judgment block, upper and lower limit values of a primary frequency modulation power increment command are set in a second judgment block, upper and lower limit values of a deviation between an actual main steam pressure and a set value are set in a third judgment block,
if the valve opening value of the current unit turbine valve is smaller than the set upper limit value of the valve opening of the unit turbine and larger than the set lower limit value of the valve opening of the unit turbine, outputting a logic signal by the first judging blockaIs 0;
if the valve opening value of the current unit turbine valve is larger than the set upper limit value of the valve opening of the unit turbine or smaller than the set lower limit value of the valve opening of the unit turbine, outputting a logic signal by the first judging blocka1 is shown in the specification;
if the primary frequency modulation power increment command value is smaller than the set primary frequency modulation power increment command upper limit value and larger than the set primary frequency modulation power increment command lower limit value, the logic signal output by the second judging blockbIs 0;
if the primary frequency modulation power increment command value is larger than the set primary frequency modulation power increment command upper limit value or smaller than the set primary frequency modulation power increment command lower limit value, the logic signal output by the second judging blockb1 is shown in the specification;
if the deviation value between the actual main steam pressure and the set value is smaller than the set actual valueThe logic signal output by the third judging block when the upper limit value of the deviation between the main steam pressure and the set value is larger than the lower limit value of the deviation between the set actual main steam pressure and the set valuecIs 0;
if the deviation value between the actual main steam pressure and the set value is larger than the upper deviation limit value between the set actual main steam pressure and the set value or smaller than the lower deviation limit value between the set actual main steam pressure and the set value, the logic signal output by the third judging blockc1 is shown in the specification;
second, the logic signal isaAnd logic signalbInputting the first AND gate block to perform AND operation, and outputting logic signalse；
Will logic signalbInputting the first NOT block to perform negation calculation, and outputting logic signals by the first NOT blockd；
Will logic signalbAnd logic signalcInputting the second AND gate block to perform AND operation, and outputting logic signalf；
Will logic signaleAnd logic signalfInputting the first OR gate block to perform OR determination, and outputting logic signalg；
Then, the following steps are carried out; will logic signalgAs S-terminal input of RS trigger, logic signaldR end input as RS trigger;
finally, the RS flip-flop pairs logic signalsgAnd logic signaldTriggering and resetting judgment are carried out, and the RS trigger outputs a condensate water throttling triggering signalhThe method comprises the steps of carrying out a first treatment on the surface of the When the S input end and the R input end of the RS trigger are both 0, the RS trigger is kept in an original state; when the S input end of the RS trigger is 1 and the R input end of the RS trigger is 0, the condensed water output by the RS trigger throttles the trigger signalh1 is shown in the specification; when the R input end is 1 and the S input end is 0, the condensed water throttling trigger signal output by the RS triggerhIs 0.
2. The auxiliary control method for primary frequency modulation of a full-cycle admission turbine unit according to claim 1, wherein the concrete method for performing switching control by using the signal as a judgment by the condensate water throttling rapid load-changing control unit is as follows:
firstly, inputting primary frequency modulation power increment into a function F (x) module, and outputting a frequency difference instruction of a coagulation pump frequency converter by the function F (x) module;
then, the condensed water is throttled and triggeredhAn En end on the first selection block of the input value, and frequency difference instructions of a constant and a coagulation pump frequency converter are respectively input to a selection end In1 and a selection end In2 of the first selection block; wherein, when the En receives the condensate water throttling trigger signalhWhen the input terminal is 1, the selection terminal In2 of the first selection block is used as the input terminal of the first addition block; when the En receives the condensate water throttling trigger signalhWhen the value is 0, the selection end In1 of the first selection block is used as the input end of the first addition block;
and then, inputting the original condensing pump frequency converter instruction into a first adding block, and carrying out summation calculation with the output signal of the first selecting block, wherein the first adding block outputs the condensing pump frequency converter instruction, so that auxiliary adjustment of primary frequency modulation is realized.
3. The auxiliary control method for primary frequency modulation of a full-cycle steam turbine unit according to claim 1, wherein the primary frequency modulation capacity judging unit in the current state of the unit comprises a first judging block, a first AND gate block, a second judging block, a second AND gate block, a first NOT gate block, a third judging block, a first OR gate block and an RS trigger, wherein the opening of a steam turbine valve is connected to the input end of the first judging block, and the output end of the first judging block is connected to the first AND gate block;
the primary frequency modulation power increment instruction is connected to the input end of a second judgment block, the output end of the second judgment block is connected with the input ends of a first AND gate block, a second AND gate block and a first NOT gate block, and the output end of the first NOT gate block is connected with the reset end R end of the RS trigger;
the deviation between the actual main steam pressure and the set value is connected to the input end of a third judgment block, and the output end of the third judgment block is connected to the input end of a second AND gate block;
the output ends of the first AND gate block and the second AND gate block are respectively connected with the input end of the first OR gate block, and the output end of the first OR gate block is connected with the trigger end S end of the RS trigger; the output end of the RS trigger is connected with a condensate water throttling rapid load-changing control unit.
4. The auxiliary control method for primary frequency modulation of a full-cycle steam turbine set according to claim 1, wherein the condensate water throttling rapid load-changing control unit comprises a function F (x) module, a first selection block and a first addition block, wherein a primary frequency modulation power increment instruction is connected to an input end of the function F (x) module, and an output end of the function F (x) module is connected to an input end of the first selection block;
the throttle trigger signal and the constant are both connected with the input end of the first selection block, the output end of the first selection block is connected with the input end of the first addition block, and the output of the first addition block is used as a condensing pump frequency converter instruction.
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