CN102591201B - 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 runback process.
Background technology
High capacity along with firepower unit, when the Important Auxiliary equipment of unit breaks down, also increasing on the impact of electrical network and impact, the safe and stable operation of unit is being related to 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 to reduce to the load desired value still can bear at the subsidiary engine moving.This function of coordinated control system is called runback (RUNBACK); be called for short RB; the object of RB Functional Design is automatic handling failure and automatically the load of unit is down to current operational outfit and is allowed the corresponding target of exerting oneself; maintain the major parameter of unit in allowed limits; avoid the protection action of unit, guarantee the safe operation of unit and electrical network.
In there is a period of time in moment and RB generating process in RB, due to breaker trip, process variable moment generation significantly changes, it is saturated very easily to there is integration in system controller, this is because of the effect due to counterbalance weight, as Fig. 1, counterbalance weight is exported x under normal circumstances, both sides output UA=y1=x1=x ± z, UB=y2=x2=xz, a unexpected side breaker trip, function due to counterbalance weight and biasing logic, the instruction of tripping operation side subsidiary engine can be added to and not trip in the instruction of side subsidiary engine, make the z=x that setovers, produce the process variable of x1=2x (or x2=2x), this variable may produce an instruction over subsidiary engine maximum output, if the side that at this time do not trip subsidiary engine will be adjusted back, must be through the readjustment of an idle motion, this idle motion has just produced saturated, in zone of saturation, can make automatically to regulate effect out of hand, it is reasonable that this just needs RB to control Functional Design, importantly controller has the saturated function of anti-integration, otherwise cause that adjusting not in time, cause unit chaser, totally unfavorable to electrical production and power grid security.A good RB logical design is can make system afford to stand significantly fluctuate and remain in controlled range.
Common RB operating mode once blower fan trips, send fan trip, Feed Pump Trip, air preheater and coal pulverizer tripping operation etc.Be below anti-integration saturation process conventional in firepower unit as shown in Figure 1, take A side as example, at RB, occur moment, trigger controller produces follows the tracks of numerical value, and numerical value is, but after subsidiary engine B tripping operation, be output as zero, so Time Controller is followed the tracks of numerical value, become, now biasing logic is also forced to be output as, manual operator is output as, and completes the saturated function of anti-integration.
In thermal power generation unit, the anti-integration saturation logic design of conventional RB is when RB occurs, RB signal leading in the middle of logic to realize the function that anti-integration is saturated, this design of Fig. 1 can only realize RB, and that the anti-integration of moment occurs is saturated, but in RB process until in a period of time before resetting, if subsidiary engine is exerted oneself less or parameter arrange improper, still there will be integration saturated phenomenon, now may cause oppositely regulating the time slow, secondly, if subsidiary engine is exerted oneself larger, there is not saturated phenomenon, now RB signal still can move, produce a traceback signal, can make system have concussion, unfavorable to regulating.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, and the saturated control method of anti-integration in a kind of runback 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 runback process, this control method does not adopt RB signal to trigger, before manual operator, increased accordingly limiter, according to instruction and subsidiary engine, exert oneself and compare to trigger, when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine are during at auto state, causing that this side is exerted oneself increases suddenly, in this side subsidiary engine is exerted oneself the scope allowing, do not produce the saturated action of anti-integration, if surpassing this side exerts oneself, produce the saturated function of anti-integration, until it is saturated to eliminate integration, concrete methods of realizing is as follows:
Step 1: when A, B side are 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 represents subsidiary engine A instruction; Y1 represents the instruction after subsidiary engine A amplitude limit; X1 represents the instruction before subsidiary engine A amplitude limit; X represents the command value that controller calculates; H1 represents subsidiary engine A maximum output; UB represents subsidiary engine B instruction; Y2 represents the instruction after subsidiary engine B amplitude limit; X2 represents the instruction before subsidiary engine B amplitude limit; H2 represents subsidiary engine B maximum output; Z represents the instruction of setovering, the size of exerting oneself in order to adjust subsidiary engine; S represents 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 A side is exerted oneself increases suddenly, in A side subsidiary engine is exerted oneself the scope allowing, is x1-h1 s, does not produce the saturated action of anti-integration, system does not trigger the saturated function of anti-integration, system normal regulating; If while exerting oneself x1-h1 > s over this side, 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, then according to the situation of load shedding, automatically adjusts, and completes anti-integration saturated;
Step 3: if A side subsidiary engine breaks down or tripping operation and B side subsidiary engine when auto state, causing that B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope allowing, is x2-h2 s, does not produce the saturated action of anti-integration, system does not trigger the saturated function of anti-integration, system normal regulating; If while exerting oneself x2-h2 > s over this side, 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, then according to the situation of load shedding, automatically adjusts, and completes anti-integration saturated.
In described step 2 or 3, as follows according to the self-adjusting method of the situation of load shedding: after breaker trip, system-computed goes out a load instruction matching, this instruction passes to default value sp, 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 complete anti-integration.
Beneficial effect of the present invention:
1, during fired power generating unit auxiliary machinery fault, can reduce fast and effectively load, safeguard unit safety and power grid security.
2, in RB process until in a period of time before resetting, improper if subsidiary engine problem or parameter arrange, this design still can produce the saturated function of anti-integration.
If it is larger that 3 subsidiary engines are exerted oneself, during lower than the maximum output of one-sided subsidiary engine, RB just can not follow the tracks of by trigger controller, avoids the concussion of system, is conducive to regulate.
4, be conducive to safeguard the safe operation of subsidiary engine equipment.
Accompanying drawing explanation
Fig. 1 is conventional RB control program in firepower unit;
Fig. 2 is the scheme that the present invention adopts;
Fig. 3 is B side breaker trip control program process flow diagram;
Wherein: sp: default value; Pv: systematic procedure variable; 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 invention will be further described.
In an actual digital quantity PID control system, the variation Yin Shou topworks of controlled quentity controlled variable or the physics of executive component and the constraint of mechanical property (as valve opening) and be limited within the scope of certain effective travel
U
min≤U≤U
max
When the controlled quentity controlled variable of exporting is within the scope of this, system normal regulating, once controlled quentity controlled variable exceeds this limited field, the action of topworks is no longer the calculated amount of control system, when needing the quite a while, anti-timing controlled quentity controlled variable departs from saturation region, therefore cause significantly overshoot of system, it is unfavorable that system is regulated, the saturated time that has increased system adjusting of integration.
Control program that the present invention adopts as shown in Figure 2, it does not adopt RB signal to trigger, two limiters before manual operator, have been added, according to instruction and subsidiary engine, exert oneself and compare to trigger, when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine are during at auto state, causing that this side is exerted oneself increases suddenly, in the time of in this side subsidiary engine is exerted oneself the scope allowing (x1-h1 s), do not produce the saturated action of anti-integration, if while exerting oneself (x1-h1 > s) over this side, produce the saturated function of anti-integration, until it is saturated to eliminate integration, concrete function is achieved as follows explanation:
When A, B side are during all at auto state, under normal circumstances: counterbalance weight output x, both sides output UA=y1=x1=x ± z≤h1; UB=y2=x2=xz≤h2.
The B side of take tripping operation is example, as shown in Figure 3, if now B side subsidiary engine breaks down or trips, now the function due to counterbalance weight and biasing logic makes z=x to process flow diagram, due to x1=x ± z, therefore x1=2x, now, if x1≤h1, be x1-h1 s, system does not trigger the saturated function of anti-integration, y1=x1, system normal regulating, if x1>h1, be x1-y1>s (s>0), trigger the saturated function of anti-integration, controller carries out traceback, again because y1 maximum can only be exported h1, be y1=h1, make controller follow the tracks of and be output as x=h1/2, again because z=h1/2, so y1=h1, the maximum output that keeps subsidiary engine, complete the saturated function of anti-integration, with Time Controller, according to the situation of load shedding, automatically adjust, after being breaker trip, system-computed goes out a load instruction matching, this instruction meeting impact or pass to sp, simultaneity factor state can change because of breaker trip, thereby affect pv, controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby enter 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 B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope allowing, is x2-h2 s, does not produce the saturated action of anti-integration, system does not trigger the saturated function of anti-integration, system normal regulating, if while exerting oneself x2-h2 > s over this side, 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 z=h2/2, so y2=h2, the maximum output that keeps subsidiary engine, then according to the situation of load shedding, automatically adjust, after being breaker trip, system-computed goes out a load instruction matching, this instruction meeting impact or pass to sp, simultaneity factor state can change because of breaker trip, thereby affect pv, controller can calculate exerting oneself of subsidiary engine according to new sp and pv, thereby enter into new equilibrium state.
RB controls and especially in big power station, to have a wide range of applications to improving the automatic handling failure function of unit, if RB Functional Design is improper, can cause after breaker trip unit parameter operation improper and affect stable operation of unit, and chaser accident even occurs.Therefore, perfect RB Functional Design has great importance to improving the safe and stable operation of the capable reliability of unit and electrical network.The saturated function of the anti-integration of this critical value relative method combines with the maximum output of subsidiary engine, and can realize the dynamic control function in whole RB process, makes system more stable and healthy and strong.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the 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 do not need to 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 a runback process, it is characterized in that, this control method does not adopt runback signal to trigger, before manual operator, increased accordingly limiter, according to instruction and subsidiary engine, exert oneself and compare to trigger, when the generation tripping operation of opposite side subsidiary engine or fault and this side subsidiary engine are during at auto state, causing that this side is exerted oneself increases suddenly, in this side subsidiary engine is exerted oneself the scope allowing, do not produce the saturated action of anti-integration, if surpassing this side exerts oneself, produce the saturated function of anti-integration, until it is saturated to eliminate integration, concrete methods of realizing is as follows:
Step 1: when A, B side are 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 represents subsidiary engine A instruction; Y1 represents the instruction after subsidiary engine A amplitude limit; X1 represents the instruction before subsidiary engine A amplitude limit; X represents the command value that controller calculates; H1 represents subsidiary engine A maximum output; UB represents subsidiary engine B instruction; Y2 represents the instruction after subsidiary engine B amplitude limit; X2 represents the instruction before subsidiary engine B amplitude limit; H2 represents subsidiary engine B maximum output; Z represents the instruction of setovering, the size of exerting oneself in order to adjust subsidiary engine; σ represents 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 A side is exerted oneself increases suddenly, in A side subsidiary engine is exerted oneself the scope allowing, is x1-h1≤σ, does not produce the saturated action of anti-integration, system does not trigger the saturated function of anti-integration, system normal regulating; If while exerting oneself x1-h1 > σ over this side,
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, then according to the situation of load shedding, automatically adjusts, and completes anti-integration saturated;
Step 3: if A side subsidiary engine breaks down or tripping operation and B side subsidiary engine when auto state, causing that B side is exerted oneself increases suddenly, in B side subsidiary engine is exerted oneself the scope allowing, is x2-h2≤σ, does not produce the saturated action of anti-integration, system does not trigger the saturated function of anti-integration, system normal regulating; If while exerting oneself x2-h2 > σ over this side,
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, then according to the situation of load shedding, automatically adjusts, and completes anti-integration saturated.
2. the saturated control method of anti-integration in runback process as claimed in claim 1, it is characterized in that, in described step 2 or 3, as follows according to the self-adjusting method of the situation of load shedding: after breaker trip, system-computed goes out a load instruction matching, 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 complete anti-integration.
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| CN102591201B (en) * | 2012-02-09 | 2014-02-12 | 山东电力研究院 | Control method of integral saturation resistance in auxiliary machine failure load reduction process |
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| CN112346365B (en) * | 2020-11-03 | 2021-10-08 | 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 |
| 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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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: SHANDONG ELECTRIC POWER Research Institute Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: State Grid Corporation of China |
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Effective date of registration: 20220128 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |
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