CN112436561A - Dynamic parameter adjusting method for active power of generator set and storage medium - Google Patents
Dynamic parameter adjusting method for active power of generator set and storage medium Download PDFInfo
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- CN112436561A CN112436561A CN202011128582.3A CN202011128582A CN112436561A CN 112436561 A CN112436561 A CN 112436561A CN 202011128582 A CN202011128582 A CN 202011128582A CN 112436561 A CN112436561 A CN 112436561A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
Abstract
The invention discloses a dynamic parameter adjusting method of active power of a generator set and a storage medium. The method comprises (1) a dynamic parameter PID adjusting method; (2) dynamic parameter adjustment, wherein 3 groups of different proportional coefficients Kp1, Kp2 and Kp3 are set and are respectively suitable for large-amplitude fast adjustment, intermediate-amplitude slow adjustment and small-amplitude fine adjustment; (3) a dynamic parameter adjustment method, when the e (k) is judged to be larger, the Kp1 is called; calling Kp2 when the e (k) is judged to be medium; when the e (k) is judged to be small, Kp3 is called. When the unit is in different active power regulation working conditions or in different stages of certain active power regulation, the method can automatically call a proper proportionality coefficient to participate in PID calculation in each regulation period, finally obtain the most proper calculation result, send the most proper calculation result to a speed regulator system, act on the guide vane, finally adjust the active power output of the unit, and enable the unit to obtain the optimal active power regulation dynamic effect.
Description
Technical Field
The invention relates to a dynamic parameter adjusting method and a storage medium for active power of a generator set, and belongs to the technical field of hydroelectric power generation.
Background
At present, the active power regulation of domestic large and medium-sized water turbine generator sets generally adopts a PID control strategy, but generally only adopts a proportional link, does not adopt an integral link and a differential link, and has fixed parameters.
In the mode, the active power regulation performance of the unit depends on the setting of the proportionality coefficient Kp, the mode is too single, and the flexibility is insufficient. Once the control parameters are improperly set or the operating conditions of the unit change, the active power regulation performance is deteriorated, and even accidents and equipment damage are caused.
For a bulb tubular water turbine generator set in a weak power grid with small power grid capacity, no large-capacity fixed-load users, frequent active regulation and unstable operation, on one hand, due to the adoption of a paddle-guide vane double regulation mode, the bulb tubular water turbine generator set has the characteristics of small rotational inertia and quick change of rotating speed, the traditional active PID control strategy often has unqualified regulation conditions of overtime regulation, large overshoot amplitude, multiple fluctuation times and the like, the power quality is seriously reduced, and the safe and stable operation of the generator set and the power grid is threatened. On the other hand, under the condition of large-machine small-net, the machine set frequently participates in active regulation, and the improper active regulation strategy can cause the machine set to operate under the guide vane-blade non-cooperative working condition frequently and for a long time, so that the vibration and the swing of the machine set are intensified, the problems of bolt loosening of a water turbine part, local stress increase and the like are easily caused, the damage risk of the main machine part of the machine set is increased rapidly, and the long-period safe and stable operation of the machine set is threatened.
Disclosure of Invention
The invention aims to solve the problems and the defects, and is realized by adopting the following technical means:
(1) aiming at the operation rule of the unit under a weak power grid and the characteristics of the bulb through-flow type water turbine generator set, the optimal control quantity can be calculated by a dynamic parameter PID control strategy under different active regulation working conditions and at different stages in the active regulation process each time, so that the rapid regulation, the slow regulation of the middle amplitude and the fine regulation of the small amplitude are realized, the good balance is obtained between the dynamic performance and the transient performance, and the good regulation effect of 'rapid, stable and accurate' is realized.
(2) The active power regulation performance of the unit is improved, the power quality is improved, the adaptability of the unit in a weak power grid with frequent adjustment and unstable operation is improved, and the safe and stable operation level of the unit and the power grid is improved.
(3) The operating condition of the bulb tubular turbine generator set in a weak power grid is improved, the aging and damage of the set equipment caused by poor active regulation performance are reduced, and the health cycle of the set equipment is prolonged.
The technical scheme of the invention has the general idea that:
(1) using dynamic parameter PID regulation
On the basis of a conventional active power regulation PID strategy of the water turbine generator set, a dynamic parameter PID control strategy is adopted according to the characteristics of small rotational inertia and poor regulation stability of the bulb tubular generator set and the special conditions of frequent active power regulation and poor power grid stability of a weak power grid.
In the formula: e (k) is the difference between the target value and the actual value of the PID link in the k-th regulation period;
u (k) is a first regulation period, and the control quantity output to the speed regulator system is obtained through active regulation PID calculation of the unit computer monitoring system;
and Kpn is a variable proportional parameter (Kp), and dynamic adjustment is carried out according to the actual operation condition of the unit.
(2) Dynamic parameter settable
3 groups of different proportionality coefficients Kp1, Kp2 and Kp3 are set and are respectively suitable for large-amplitude fast adjustment, middle-amplitude slow adjustment and small-amplitude fine adjustment;
according to the performance of the unit and through a power regulation test of a monitoring-speed regulation system, a group of regulation parameters with small overshoot, fast convergence and less fluctuation times are selected:
kp1 is 400-700, and is called when the deviation amount is large, so as to achieve the purpose of accelerating the adjustment speed;
kp2 is 200-400, and is called when the deviation amount is medium and is used in the normal adjusting process;
and Kp3 is 50-200, and is called when the deviation amount is small, so that the aims of reducing overshoot and fluctuation times and improving the adjustment precision are fulfilled.
The specific value can be set through tests according to the specific conditions (such as unit specification, operating water head, requirements of a scheduling mechanism on the adjustment performance and the like) of different application cases.
(3) Dynamic parameter adjusting method
The real-time judgment is carried out by a computer monitoring program, and after the unit enters active PID regulation:
calling Kp1 when deviation amount of active power target value and actual value e (k) is larger (e (k) is larger than 5 MW);
calling Kp2 when the deviation value e (k) between the active power target value and the actual value is medium (e (k) is more than or equal to 2 and less than or equal to 5 MW);
kp3 is invoked when the active power target value deviation from the actual value e (k) is small (e (k) < 2 MW).
When the unit is in different active power regulation working conditions or in different stages of certain active power regulation, the strategy can automatically call a proper proportionality coefficient to participate in PID calculation in each regulation period, finally, the most proper calculation result can be obtained, the calculation result is sent to a speed regulator system, the calculation result acts on a guide vane, and finally, the active power output of the unit is adjusted, so that the unit obtains the optimal active power regulation dynamic effect.
According to the above thought, the active power regulation PID control strategy of the dynamic parameter unit has the following specific technical scheme:
a dynamic parameter adjusting method for active power of a generator set comprises the following steps:
(1) dynamic parameter PID regulation
In the formula: e (k) is the difference between the regulation target value and the actual value of the PID link in the k regulation period; u (k) is output control quantity obtained by performing PID (proportion integration differentiation) regulation calculation on the active power of the bulb tubular turbine set in the k regulation period; kpn is a variable proportional parameter Kp, and can be dynamically set according to the actual operating condition of the unit;
(2) dynamic parameter setting
The proportional parameters Kp are set to be Kp1, Kp2 and Kp3 which are three groups, and the Kp1 is more than Kp2 is more than Kp 3;
the Kp1, the Kp2 and the Kp3 are respectively suitable for large-amplitude fast tuning, intermediate-amplitude slow tuning and small-amplitude fine tuning;
(3) dynamic parameter adjusting method
After the bulb tubular set enters active power PID regulation:
calling Kp1 when the e (k) is judged to be larger;
calling Kp2 when the e (k) is judged to be medium;
when the e (k) is judged to be small, Kp3 is called.
Further, the Kp1 is 500; said Kp2 ═ 375; the Kp3 is 200.
Further, the larger judgment basis of e (k) is that e (k) is more than 5 MW; the judgment basis of the e (k) being medium is that 2MW is less than or equal to e (k) is less than or equal to 5 MW; the smaller criterion of e (k) is that e (k) is less than 2 MW.
A computer readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the active regulation dynamic parameter PID control method.
The dynamic parameter adjusting system for the active power of the generator set comprises an automatic control computer, wherein the readable storage medium is arranged in the computer and is used for realizing the active power adjustment of the generator set.
The invention has the beneficial effects that:
compared with the active PID control method widely used by the monitoring system of the hydroelectric generating set at present, the active regulation dynamic parameter PID control method can dynamically and autonomously select and call PID regulation parameters according to the actual operation condition of the set, and further realize that:
(1) the dynamic response performance of the unit under various active power regulation working conditions is improved, and a control method which not only gives consideration to rapidity, but also ensures the regulation process to be stable and free from fluctuation is found;
(2) the active power adjustability is improved, so that the power quality level of the unit and the whole plant is improved;
(3) the adaptability of the unit (especially a bulb tubular unit) to complex operating conditions under a weak power grid is improved, and the health level of equipment is improved.
Drawings
Figure 1 prior art active regulation curve before the invention is implemented.
FIG. 2 is a block diagram of the dynamic parameter PID control strategy of the present invention.
FIG. 3 is a schematic diagram of a dynamic parameter invocation link according to the present invention.
Fig. 4 shows the active power regulation curve of the unit after the method of the invention is implemented.
Detailed Description
The invention discloses an active power regulation PID control strategy of a dynamic parameter unit, which has the following technical scheme in specific implementation:
PID control Overall strategy
On the basis of a conventional active power regulation PID strategy of a water turbine generator set, a dynamic parameter PID control strategy is adopted according to the characteristics of small rotational inertia and poor regulation stability of a bulb tubular generator set and the special conditions of frequent active power regulation and poor power grid stability of a weak power grid, and a control block diagram of the dynamic parameter PID control strategy is shown in FIG. 2.
After the unit enters active PID adjustment, the deviation of the target value and the actual value of the unit active power is calculated, and PID parameters, namely a dynamic parameter calling link, are selectively called according to the calculation result. And dynamically calling every active power regulation calculation period once to ensure that every regulation period can call to obtain the optimal PID parameter.
2. Dynamic parameter adjustment strategy
According to the operation experience, 3 groups of different proportional coefficients Kp1, Kp2 and Kp3 are set, and the method is respectively suitable for large-amplitude fast adjustment, medium-amplitude slow adjustment and small-amplitude fine adjustment.
Here, Kp1 is 500; kp 2-375; kp3 is 200.
The dynamic parameter invocation link is shown in fig. 3.
The real-time judgment is carried out by a computer monitoring program, and after the unit enters active PID regulation:
when the deviation amount e (k) between the active power target value and the actual value is larger (e (k) is more than 5MW), calling Kp1 to accelerate the regulation speed;
calling Kp2 when the deviation value e (k) between the active power target value and the actual value is medium (e (k) is more than or equal to 2 and less than or equal to 5 MW);
when the deviation amount e (k) of the active power target value and the actual value is smaller (e (k) < 2MW), the Kp3 is called to reduce the overshoot and the fluctuation times and improve the regulation precision.
After the dynamic parameter calling link, the calculated result participates in the subsequent control flow.
As can be seen from fig. 3, when the unit is in different active power regulation conditions or in different stages of a certain active power regulation, the strategy can automatically call a suitable proportionality coefficient to participate in PID calculation in each regulation period, and finally obtain the most suitable calculation result, and send the most suitable calculation result to the speed regulator system to act on the guide vane to finally adjust the active power output of the unit, so that the unit obtains the optimal active power regulation dynamic effect.
After the method is implemented, the active power regulation performance of the unit is remarkably improved. It can be seen from fig. 4 that the problems of large overshoot amplitude, many overshoot times, slow adjustment speed, etc. existing in the active power adjustment of the unit are completely eliminated.
Through operation data statistics, the average response time of the unit active power regulation is shortened from 30.5s to 25.4s after the method is implemented, and the improvement is 16%; the active regulation rate is increased from 23.7% to 36.6%, the active regulation rate is increased by 22%, and the regulation effect of 'quick, accurate and stable' active regulation is realized.
In summary:
firstly, through experimental verification, the dynamic response performance of the unit under various active power regulation conditions is improved. Taking the curves shown in fig. 1 and fig. 4 as an example, it can be seen that the active power regulation dynamic response of the unit is obviously improved;
secondly, the active power regulation performance of the unit is improved, and the power quality performance such as voltage, frequency, transient process and the like is improved;
due to the characteristics of the bulb through-flow type turbine unit, when the unit performs active power adjustment, the coordinated action of blades and guide vanes is needed to maintain the cooperative relation, in the dynamic adjustment process, the unit is in a non-cooperative state, the vibration and the swing of the unit are much larger than those in a normal state in the state, the unit is frequently in the non-cooperative state for a long time, the problems of loosening of bolts of water turbine parts, increase of local stress and the like are easily caused, the damage risk of the main machine parts of the unit is increased rapidly, and the long-period safe and stable operation of the unit is threatened. Therefore, for the bulb tubular unit under a weak power grid which needs to be subjected to active power regulation frequently, the active power regulation performance is optimized, the unit regulation time is reduced, the running time of the unit under a non-cooperative working condition is obviously reduced, and the health level of the unit is improved.
Claims (5)
1. A dynamic parameter adjusting method for active power of a generator set is characterized by comprising the following steps:
(1) dynamic parameter PID regulation
In the formula: e (k) is the difference between the regulation target value and the actual value of the PID link in the k regulation period; u (k) is output control quantity obtained by performing PID (proportion integration differentiation) regulation calculation on the active power of the bulb tubular turbine set in the k regulation period; kpn is a variable proportional parameter Kp, and can be dynamically set according to the actual operating condition of the unit;
(2) dynamic parameter setting
The proportional parameters Kp are set to be Kp1, Kp2 and Kp3 which are three groups, and the Kp1 is more than Kp2 is more than Kp 3;
the Kp1, the Kp2 and the Kp3 are respectively suitable for large-amplitude fast tuning, intermediate-amplitude slow tuning and small-amplitude fine tuning;
(3) dynamic parameter adjusting method
After the bulb tubular set enters active power PID regulation:
calling Kp1 when the e (k) is judged to be larger;
calling Kp2 when the e (k) is judged to be medium;
when the e (k) is judged to be small, Kp3 is called.
2. The active regulation dynamic parameter PID control method according to claim 1, characterized in that:
400-700 is taken as the Kp 1;
the Kp2 can be 200-400;
the Kp3 may be 50-200.
3. Active regulation dynamic parameter PID control method according to claim 1 or 2, characterized in that:
the larger judgment basis of e (k) is that e (k) is more than 5 MW;
the judgment basis of the e (k) being medium is that 2MW is less than or equal to e (k) is less than or equal to 5 MW;
the smaller criterion of e (k) is that e (k) is less than 2 MW.
4. A computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the active regulation dynamic parameter PID control method according to any of the claims 1 to 3.
5. A dynamic parameter adjustment system for the active power of a generator set, comprising an automatic control computer, wherein the readable storage medium of claim 4 is arranged in the computer and used for realizing the active power adjustment of the generator set.
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| CN109301844A (en) * | 2018-11-13 | 2019-02-01 | 南方电网科学研究院有限责任公司 | A kind of hydro turbine governor pid parameter optimization method and device based on network system |
| CN110488601A (en) * | 2019-09-26 | 2019-11-22 | 山东和信智能科技有限公司 | Fired power generating unit load control system optimization system and method based on Real-time Monitoring Data |
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