The Multirate adjusting method of steam turbine feedforward
阅读说明：本技术 汽轮机前馈的多级速率调节方法 (The Multirate adjusting method of steam turbine feedforward ) 是由 石家魁 姚坤 万杰 曹勇 任国瑞 付俊丰 孙殿承 张磊 江万泽 李晓明 刘东旭 于 2019-09-04 设计创作，主要内容包括：汽轮机前馈的多级速率调节方法,属于电力系统自动控制技术领域,本发明为解决现有在大范围变负荷时汽轮机侧的自动增益控制调节性能无法满足需要的问题。本发明调节方法的具体过程为：获取AGC负荷指令和机组实际负荷,计算偏差值ΔN；获取加负荷段阈值L；判断偏差值ΔN的范围,如果-L≤ΔN≤L,输出功率信号为机组实际负荷；否则实时计算速率限制参数M；判断偏差值ΔN的范围,如果-M≤ΔN≤M,则将最大修正速率加负荷时的负荷输出值作为输出功率信号,否则将最小修正速率加负荷时的负荷输出值作为输出功率信号。本发明用于火电机组中。(The Multirate adjusting method of steam turbine feedforward, belongs to automatic control technology of power system field, the present invention is to solve the problems, such as that the automatic growth control regulation performance of the existing steamer pusher side in a wide range of varying duty is unable to satisfy to need.The detailed process of adjusting method of the present invention are as follows: obtain AGC load instruction and unit actual load, calculate deviation Δ N；Obtain application of load section threshold value L；The range of judgment bias value Δ N, if-L≤Δ N≤L, output power signal is unit actual load；Otherwise real-time computation rate limits parameter M；The range of judgment bias value Δ N, if-M≤Δ N≤M, load output valve when using maximum modified rate application of load as output power signal, otherwise using it is minimum correct rate application of load when load output valve as output power signal.The present invention is in fired power generating unit.)
1. the Multirate adjusting method of steam turbine feedforward, which is characterized in that the detailed process of the adjusting method are as follows:
S1, AGC load instruction N' and unit actual load N is obtained, calculates deviation Δ N=N-N'；
S2, application of load section threshold value L is obtained；
The range of S3, judgment bias value Δ N, if it is-L≤Δ N≤L, then output power signal is unit actual load N, such as Fruit is no, then executes S4；
S4, real-time computation rate limit parameter M；
The range of S5, judgment bias value Δ N, if it is-M≤Δ N≤M, then by maximum modified rate application of load when load it is defeated Value N outmaxAs output power signal, otherwise minimum is corrected to load output valve N when rate application of loadminAs output power Signal.
2. the Multirate adjusting method of steam turbine feedforward according to claim 1, which is characterized in that acquisition described in S2 adds negative Lotus section threshold value L's method particularly includes:
L=1% × (35%~40%) × N0；
Wherein, N0Indicate unit rated load.
3. the Multirate adjusting method of steam turbine feedforward according to claim 1 or claim 2, which is characterized in that described in S4 in real time Computation rate limits parameter M's method particularly includes:
M=d (Cb(Pdt-Pd0))/dt；
Wherein, PdtIndicate unit minimum pressure, Pd0Indicate load point pressure, CbIndicate boiler energy storage coefficient.
4. the Multirate adjusting method of steam turbine feedforward according to claim 3, which is characterized in that boiler energy storage coefficient Cb Circular are as follows:
Cb=∫ (N (t)-N (0)) dt/ (Pdt-Pd0)；
Wherein, N (0) indicates unit actual power value, and N (t) indicates to open the unit load value after the decline of pitch application of load pressure；N (t)-N (0) indicates the variable quantity of load.
5. the Multirate adjusting method of steam turbine feedforward according to claim 4, which is characterized in that minimum amendment rate adds Load output valve N when loadminAre as follows:
Nmin=d (Cb(Pdt-Pd0))/dt+N(0)。
Technical field
The present invention relates to a kind of Multirate adjusting methods of steam turbine feedforward, belong to automatic control technology of power system neck Domain.
Background technique
In recent years, increased year by year using the accounting that solar energy, wind energy are the new energy of representative in electricity generation system, solar energy and The new energy such as wind energy have stronger randomness, this brings new challenge to the stabilization of power grid, also to traditional fired power generating unit More stringent requirements are proposed for load responding ability.
In this context, the regulation performance for improving Generation Side AGC (automatic growth control) is imperative, and traditional AGC is adjusted System is to receive the AGC signal of power grid with unit CCS (coordinating system) for main executive, after signal processing, coordinates machine Group boiler, steam turbine co-operating, to meet the requirement of power grid functions combination.
CCS system in a manner of BF premised on (Boiler Follow, boiler following mode), before increasing steam turbine to it Feedback system can significantly improve regulation performance.But this coordinated control mode, boiler side response itself lag behind steam turbine side, herein If steam turbine feedforward on the basis of only improves response speed and cannot improve and adjust stability and accuracy, it will gives boiler side band Carry out bigger adjusting pressure, vapour pressure can fluctuation in a wide range of variable parameter operation；The addition of feedforward can also cause slightly simultaneously Degree load disturbance can cause pitch frequent movement, and long-play will lead to pitch abrasion, so the feedforward of conventional steam turbine side System will lead to the problem of overshoot, equipment loss.
Existing AGC is adjusted, although the feedforward entered added by the steamer pusher side accelerates the tune of steam turbine side to a certain extent Speed is saved, but excessively sensitive adjust often leads to unit pitch frequent movement, longtime running certainly will influence the service life, and change in the past Into being mostly to utilize that the methods of feedforward, optimal controller is added to optimize control to boiler, steam turbine respectively, to improve unit response Rate, based on the unit cooperative under BF, boiler dominates the control to vapour pressure, when small range varying duty, though Steam Turhine Adjustment AGC signal of short duration can be so kept up with, but full adjustment rate fundamentally still relies on the response of boiler side when a wide range of varying duty.
Summary of the invention
The invention aims to solve the automatic growth control modulability of the existing steamer pusher side in a wide range of varying duty It can be unable to satisfy the problem of needing, provide a kind of Multirate adjusting method of steam turbine feedforward.
The Multirate adjusting method of steam turbine feedforward of the present invention, the detailed process of the adjusting method are as follows:
S1, AGC load instruction N' and unit actual load N is obtained, calculates deviation Δ N=N-N'；
S2, application of load section threshold value L is obtained；
The range of S3, judgment bias value Δ N, if it is-L≤Δ N≤L, then output power signal is unit actual load N, if it is not, then executing S4；
S4, real-time computation rate limit parameter M；
The range of S5, judgment bias value Δ N, if it is-M≤Δ N≤M, then by maximum modified rate application of load when it is negative Lotus output valve NmaxAs output power signal, otherwise minimum is corrected to load output valve N when rate application of loadminAs output Power signal.
Preferably, acquisition application of load section threshold value L described in S2 method particularly includes:
L=1% × (35%~40%) × N0；
Wherein, N0Indicate unit rated load.
Preferably, real-time computation rate limitation parameter M described in S4 method particularly includes:
M=d (Cb(Pdt-Pd0))/dt；
Wherein, PdtIndicate unit minimum pressure, Pd0Indicate load point pressure, CbIndicate boiler energy storage coefficient.
Preferably, boiler energy storage coefficient CbCircular are as follows:
Cb=∫ (N (t)-N (0)) dt/ (Pdt-Pd0)；
Wherein, N (0) indicates unit actual power value, and N (t) indicates to open the unit load after the decline of pitch application of load pressure Value；The variable quantity of N (t)-N (0) expression load.
Preferably, load output valve N when minimum amendment rate application of loadminAre as follows:
Nmin=d (Cb(Pdt-Pd0))/dt+N(0)。
Advantages of the present invention: the present invention is using steam turbine feedforward system as research object, on the basis of conventional feed forward system It proposes a kind of multi-change speed rate feedforward system, reduces overshoot while improving adjustment speed, reduce equipment loss.It is stored up with boiler It can be bridge, the feedforward control system of steamer pusher side is divided into multistage, guarantee that pitch infrequently acts in small range variation, greatly Boiler regulating power can be given full play to when range, reach rapidly keep up with AGC instruction while, maintain vapour pressure it is steady, reduce overshoot.
Detailed description of the invention
Fig. 1 is the flow diagram of the Multirate adjusting method of steam turbine feedforward of the present invention；
Fig. 2 is the actual operation curve of 200MW unit, and curve a indicates that power, curve b indicate integrated flow rate instruction, curve C indicates main vapour pressure；
It is according to the response curve for obtaining each load point that Fig. 3, which is with Fig. 2,.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.