CN102591201A - Control method of integral saturation resistance in auxiliary machine failure load reduction process - Google Patents
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Abstract
The invention discloses a control method of integral saturation resistance in the auxiliary machine failure load reduction process, which is characterized in that a RB (Radio Beacon) signal is not adopted to trigger; two amplitude limiters are additionally arranged in front of a hand-operated device; triggering is carried out through comparing a command with the output of an auxiliary machine; when an auxiliary machine at the other side trips or fails, and the auxiliary machine at the side is in an automatic state; the output at the side is suddenly increased; within the scope allowed by the output of the auxiliary machine at the side, the integral saturation resistance action is not generated; and if the output at the side is exceeded, an integral saturation resistance function is generated till the integral saturation is eliminated. The control method has the beneficial effects that when an auxiliary machine of a thermal power unit fails, the load can be quickly and effectively reduced; within a period of time before reset in the RB process, if the auxiliary machine fails or parameters are improperly set, the integral saturation resistance function can also be generated through the design; and when the output of the auxiliary machine is larger and is lower than the maximum output of the auxiliary machine at the single side, the RB signal cannot trigger a controller to track, so that the oscillation of a system is prevented; and the safe operation of the auxiliary machine is favorably maintained.
Description
Technical field
The present invention relates to the saturated control method of anti-integration in a kind of auxiliary machinery fault Reduction of Students' Study Load lotus process.
Background technology
High capacity along with the firepower unit; When the Important Auxiliary equipment of unit broke down, also increasing to the influence and the impact of electrical network, the safe and stable operation of unit was concerning the safety of electrical network; In order to improve the stable operation of power plant and electrical network; When unit major pant item fault trip causes the real power of unit to be restricted (coordinated control system is at auto state), for adaptation equipment is exerted oneself, coordinated control system forces unit load is reduced to the load desired value that still can bear at the subsidiary engine that moves.This function of coordinated control system is called auxiliary machinery fault Reduction of Students' Study Load lotus (RUNBACK); Be called for short RB; The purpose of RB function design is that automatic handling failure and the automatic load of unit is reduced to current operational outfit allow the corresponding target of exerting oneself; The major parameter of keeping unit is avoided the protection action of unit in allowed limits, guarantees the safe operation of unit and electrical network.
In a period of time in moment and the RB generating process takes place in RB; Because the subsidiary engine tripping operation, process variable moment generation changes significantly, and it is saturated that integration very easily takes place system controller; This is because because the effect of counterbalance weight; Like Fig. 1, counterbalance weight output x under the normal condition, both sides output UA=y1=x1=x ± z; UB=y2=x2=xz, unexpected side subsidiary engine tripping operation is because the function of counterbalance weight and biasing logic; Can be added to the instruction of tripping operation side subsidiary engine and not trip in the instruction of side subsidiary engine, make biasing z=x, produce the process variable of x1=2x (or x2=2x); This variable may produce an instruction above the subsidiary engine EIAJ, and the side that at this time do not trip subsidiary engine then must be through the readjustment of an idle motion if will adjust back; This idle motion has just produced saturated, can make automatic adjusting effect out of hand in the zone of saturation, and this just needs the RB control function reasonable in design; Importantly controller has the saturated function of anti-integration; Otherwise cause that adjusting is untimely, cause unit jumping machine, totally unfavorable to electrical production and power grid security.Good RB logical design is system can afford to stand significantly fluctuate and remain in the controlled range.
Common RB operating mode once blower fan trips, send fan trip, feed pump tripping operation, air preheater and coal pulverizer tripping operation etc.The anti-integration saturation process that below is routine in the firepower unit is as shown in Figure 1, is example with the A side, at RB takes place moment; Trigger controller and produce and follow the tracks of numerical value, numerical value does, but after the subsidiary engine B tripping operation; Be output as zero, so the time controller follow the tracks of numerical value and become, biasing logic also was forced and was output as this moment; Manual operator is output as, and accomplishes the saturated function of anti-integration.
In the thermal power generation unit, the anti-integration saturation logic design of RB commonly used is when RB takes place, and is incorporated into the function to realize that anti-integration is saturated in the middle of the logic to the RB signal; It is saturated that this design of Fig. 1 can only realize that the anti-integration of moment takes place RB, but in the RB process in a period of time before resetting, if subsidiary engine is exerted oneself less or parameter be provided with improper; Still the integration saturated phenomenon can occur, may cause oppositely regulating the time this moment slow, secondly; If subsidiary engine is exerted oneself bigger, saturated phenomenon does not take place, this moment, the RB signal still can move; Produce a traceback signal, can make system that concussion is arranged, unfavorable to regulating.
Summary of the invention
The object of the invention is exactly in order to address the above problem, and the saturated control method of anti-integration in a kind of auxiliary machinery fault Reduction of Students' Study Load lotus process is provided.
To achieve these goals, the present invention adopts following technical scheme:
The saturated control method of anti-integration in a kind of auxiliary machinery fault Reduction of Students' Study Load lotus process, this control method does not adopt the RB signal to trigger, and has increased limiter accordingly in the manual operator front; Exert oneself to compare and trigger according to instruction and subsidiary engine,, cause that this side is exerted oneself to increase suddenly when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine during at auto state; In this side subsidiary engine is exerted oneself the scope that allows; Do not produce the saturated action of anti-integration, exert oneself, then produce the saturated function of anti-integration if surpass this side; Integration is saturated until eliminating, and concrete implementation method is following:
Step 1: when A, B side during all at auto state, counterbalance weight output x, both sides output UA=y1=x1=x ± z≤h1; UB=y2=x2=xz≤h2; Wherein: UA representes subsidiary engine A instruction; Y1 representes the instruction after the subsidiary engine A amplitude limit; X1 representes the instruction before the subsidiary engine A amplitude limit; X representes the command value that controller calculates; H1 representes subsidiary engine A EIAJ; UB representes subsidiary engine B instruction; Y2 representes the instruction after the subsidiary engine B amplitude limit; X2 representes the instruction before the subsidiary engine B amplitude limit; H2 representes subsidiary engine B EIAJ; Z representes the biasing instruction, in order to adjust the size that subsidiary engine is exerted oneself; S representes a positive number, is empirical value;
Step 2: if B side subsidiary engine breaks down or tripping operation and A side subsidiary engine when auto state; Causing that the A side is exerted oneself increases suddenly, in A side subsidiary engine is exerted oneself the scope that allows, is x1-h1 s, does not produce the saturated action of anti-integration; System does not trigger the saturated function of anti-integration, system's normal regulating; If when surpassing this side and exerting oneself x1-h1＞s, then produce the saturated function of anti-integration, controller carries out traceback, and controller is followed the tracks of and is output as x=h1/2, adjusts automatically according to the situation of Reduction of Students' Study Load lotus then, and it is saturated to accomplish anti-integration;
Step 3: if A side subsidiary engine breaks down or tripping operation and B side subsidiary engine when auto state; Causing that the B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope that allows, is x2-h2 s, does not produce the saturated action of anti-integration; System does not trigger the saturated function of anti-integration, system's normal regulating; If when surpassing this side and exerting oneself x2-h2＞s, then produce the saturated function of anti-integration, controller carries out traceback, and controller is followed the tracks of and is output as x=h2/2, adjusts automatically according to the situation of Reduction of Students' Study Load lotus then, and it is saturated to accomplish anti-integration.
In the said step 2 or 3; The self-adjusting method of situation according to the Reduction of Students' Study Load lotus is following: after the subsidiary engine tripping operation; System-computed goes out a load instruction that matches, and this instruction passes to default value sp, and simultaneity factor process variable pv changes; Controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby it is saturated to accomplish anti-integration.
Beneficial effect of the present invention:
1, during the fired power generating unit auxiliary machinery fault, can reduce load fast and effectively, safeguard unit safety and power grid security.
2, in the RB process in a period of time before reset, improper if subsidiary engine problem or parameter are provided with, this design still can produce the saturated function of anti-integration.
If it is bigger that 3 subsidiary engines are exerted oneself, when being lower than the EIAJ of one-sided subsidiary engine, RB follows the tracks of with regard to not triggering controller, avoids the concussion of system, helps regulating.
4, help safeguarding the safe operation of subsidiary engine equipment.
Description of drawings
Fig. 1 is a conventional RB controlling schemes in the firepower unit;
The scheme that Fig. 2 adopts for the present invention;
Fig. 3 is a B side subsidiary engine tripping operation controlling schemes process flow diagram;
Wherein: sp: default value; Pv: systematic procedure variable; The RB:RB asserts signal; UA: subsidiary engine A instruction; UB: subsidiary engine B instruction; TS: follow the tracks of and switch; TR: pursuit gain.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
In the digital quantity PID of reality control system, the variation of controlled quentity controlled variable is limited in certain effective travel scope because of the physics that receives topworks or executive component and the constraint (like valve opening) of mechanical property
U
min≤U≤U
max
When the controlled quentity controlled variable of exporting is in this scope; System's normal regulating, in case controlled quentity controlled variable exceeds this limited field, the action of topworks no longer is the calculated amount of control system; When needing the quite a while, anti-timing controlled quentity controlled variable breaks away from the saturation region; Therefore cause system's overshoot significantly, it is unfavorable that system is regulated, the saturated time that has increased system's adjusting of integration.
Controlling schemes that the present invention of being as shown in Figure 2 adopts, it does not adopt the RB signal to trigger, and has added two limiters in the manual operator front; Exert oneself to compare and trigger according to instruction and subsidiary engine,, cause that this side is exerted oneself to increase suddenly when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine during at auto state; In the time of in this side subsidiary engine is exerted oneself the scope that allows (x1-h1 s); Do not produce the saturated action of anti-integration, exert oneself and (during x1-h1＞s), then produce the saturated function of anti-integration if surpass this side; Integration is saturated until eliminating, and concrete function is realized description below:
When A, B side during all at auto state, under the normal condition: counterbalance weight output x, both sides output UA=y1=x1=x ± z≤h1; UB=y2=x2=xz≤h2.
With the tripping operation of B side is example, and process flow diagram is as shown in Figure 3, if B side subsidiary engine broke down or tripped this moment; This moment is because the function of counterbalance weight and biasing logic makes z=x, because x1=x ± z, so x1=2x; At this moment, if x1≤h1, i.e. x1-h1 s; System does not trigger the saturated function of anti-integration, y1=x1 then, system's normal regulating; If x1>h1, i.e. x1-y1>s (s>0), triggering the saturated function of anti-integration, controller carries out traceback; Because the y1 maximum can only be exported h1, promptly y1=h1 then makes controller follow the tracks of and is output as x=h1/2, again because z=h1/2 again; So y1=h1, the EIAJ of maintenance subsidiary engine is accomplished the saturated function of anti-integration, and controller is adjusted according to the situation of Reduction of Students' Study Load lotus automatically simultaneously; After being the subsidiary engine tripping operation, system-computed goes out a load instruction that matches, and this instruction can influence or pass to sp, and the simultaneity factor state can change because of the subsidiary engine tripping operation; Thereby influence pv, controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby enters into new equilibrium state.
If same A side subsidiary engine breaks down or tripping operation and B side subsidiary engine when auto state; Causing that the B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope that allows, is x2-h2 s, does not produce the saturated action of anti-integration; System does not trigger the saturated function of anti-integration, system's normal regulating; If when surpassing this side and exerting oneself x2-h2＞s, then produce the saturated function of anti-integration, controller carries out traceback; Controller is followed the tracks of and is output as x=h2/2, again because of z=h2/2, so y2=h2; The EIAJ that keeps subsidiary engine is adjusted according to the situation of Reduction of Students' Study Load lotus then automatically, i.e. after the subsidiary engine tripping operation; System-computed goes out a load instruction that matches, and this instruction can influence or pass to sp, and the simultaneity factor state can change because of the subsidiary engine tripping operation; Thereby influence pv, controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby enters into new equilibrium state.
RB control especially has a wide range of applications in big power station to the automatic handling failure function that improves unit, if the design of RB function is improper, it is improper and influence the set steady operation to cause the unit parameter operation of subsidiary engine tripping operation back, even generation jumping machine accident.Therefore, perfect RB function design has great importance to the safe and stable operation that improves capable reliability of unit and electrical network.The saturated function of the anti-integration of this critical value relative method combines with the EIAJ of subsidiary engine, and can be implemented in the dynamic control function in the whole RB process, makes system more stable and healthy and strong.
Though the above-mentioned accompanying drawing specific embodiments of the invention that combines is described; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. the saturated control method of anti-integration in the auxiliary machinery fault Reduction of Students' Study Load lotus process is characterized in that this control method does not adopt the RB signal to trigger; Increased limiter accordingly in the manual operator front, exerted oneself to compare and trigger, when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine during at auto state according to instruction and subsidiary engine; Causing that this side is exerted oneself increases suddenly, in this side subsidiary engine is exerted oneself the scope that allows, does not produce the saturated action of anti-integration; If surpassing this side exerts oneself; Then produce the saturated function of anti-integration, integration is saturated until eliminating, and concrete implementation method is following:
Step 1: when A, B side during all at auto state, counterbalance weight output x, both sides output UA=y1=x1=x ± z≤h1; UB=y2=x2=xz≤h2; Wherein: UA representes subsidiary engine A instruction; Y1 representes the instruction after the subsidiary engine A amplitude limit; X1 representes the instruction before the subsidiary engine A amplitude limit; X representes the command value that controller calculates; H1 representes subsidiary engine A EIAJ; UB representes subsidiary engine B instruction; Y2 representes the instruction after the subsidiary engine B amplitude limit; X2 representes the instruction before the subsidiary engine B amplitude limit; H2 representes subsidiary engine B EIAJ; Z representes the biasing instruction, in order to adjust the size that subsidiary engine is exerted oneself; S representes a positive number, is empirical value;
Step 2: if B side subsidiary engine breaks down or tripping operation and A side subsidiary engine when auto state; Causing that the A side is exerted oneself increases suddenly, in A side subsidiary engine is exerted oneself the scope that allows, is x1-h1 s, does not produce the saturated action of anti-integration; System does not trigger the saturated function of anti-integration, system's normal regulating; If when surpassing this side and exerting oneself x1-h1＞s, then produce the saturated function of anti-integration, controller carries out traceback, and controller is followed the tracks of and is output as x=h1/2, adjusts automatically according to the situation of Reduction of Students' Study Load lotus then, and it is saturated to accomplish anti-integration;
Step 3: if A side subsidiary engine breaks down or tripping operation and B side subsidiary engine when auto state; Causing that the B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope that allows, is x2-h2 s, does not produce the saturated action of anti-integration; System does not trigger the saturated function of anti-integration, system's normal regulating; If when surpassing this side and exerting oneself x2-h2＞s, then produce the saturated function of anti-integration, controller carries out traceback, and controller is followed the tracks of and is output as x=h2/2, adjusts automatically according to the situation of Reduction of Students' Study Load lotus then, and it is saturated to accomplish anti-integration.
2. the saturated control method of anti-integration in the auxiliary machinery fault Reduction of Students' Study Load lotus process as claimed in claim 1 is characterized in that, in the said step 2 or 3; The self-adjusting method of situation according to the Reduction of Students' Study Load lotus is following: after the subsidiary engine tripping operation; System-computed goes out a load instruction that matches, and this instruction passes to default value sp, and simultaneity factor process variable pv changes; Controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby it is saturated to accomplish anti-integration.
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| CN111624870A (en) * | 2020-06-30 | 2020-09-04 | 中国科学院微电子研究所 | Inversion anti-integral saturation method for precise motion control |
| CN111624870B (en) * | 2020-06-30 | 2023-10-03 | 中国科学院微电子研究所 | Inversion anti-integral saturation method for precise motion control |
| CN112346365A (en) * | 2020-11-03 | 2021-02-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Control system and method suitable for double-auxiliary-machine configuration and capable of preventing auxiliary machine over-output |
| CN116845887A (en) * | 2023-09-01 | 2023-10-03 | 华北电力科学研究院有限责任公司 | Fault processing method and device for single-side auxiliary machine configuration unit |
| CN116845887B (en) * | 2023-09-01 | 2023-11-10 | 华北电力科学研究院有限责任公司 | Fault processing method and device for single-side auxiliary machine configuration unit |
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