CN104102788B - A kind of speed regulating method based on combined cycle gas turbine system model - Google Patents
A kind of speed regulating method based on combined cycle gas turbine system model Download PDFInfo
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- CN104102788B CN104102788B CN201410360669.1A CN201410360669A CN104102788B CN 104102788 B CN104102788 B CN 104102788B CN 201410360669 A CN201410360669 A CN 201410360669A CN 104102788 B CN104102788 B CN 104102788B
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Abstract
The present invention relates to a kind of speed regulating method based on combined cycle gas turbine system model, it is characterised in that comprise the following steps：1) combined cycle gas turbine system model, including regulating system model unit, fuel valve electrohydraulic servo system modeling unit and the combined cycle gas turbine prime mover model unit being sequentially connected are set up；2) using feedforward and feedback indifference PID control in regulating system model unit：The primary frequency modulation changed power requirements that mains frequency deviation is produced are added with AGC initial loads and obtain the instruction of combined cycle gas turbine actual load, then by the instruction by feedovering and feeding back the fuel valve instruction that indifference PID control is produced；3) fuel quantity signal is produced according to fuel valve instruction control fuel valve in fuel valve electrohydraulic servo system modeling unit；4) combined cycle gas turbine is controlled according to fuel quantity signal in combined cycle gas turbine prime mover model unit, adjusts combined cycle gas turbine power output.Compared with prior art, the present invention has the advantages that control accuracy is high, fast response time.
Description
Technical field
The present invention relates to a kind of speed regulating method, more particularly, to a kind of speed governing side based on combined cycle gas turbine system model
Method.
Background technology
East China Power Grid has marched toward many drop point direct currents, the new frame of extra-high voltage alternating current-direct current interconnection, and receiving end power network feature is substantially, electric
Net frequency stabilization problem becomes increasingly conspicuous.Generating set prime mover and its governing system be it is important relate to net equipment, to power system
Mains frequency stabilization has significant impact, is the basis of power network underfrequency protection strategy study, the FREQUENCY CONTROL to improving power network
System is significant.
In the last few years, being continuously increased with combustion engine quantity, its weight for accounting for the whole network installed capacity can not be ignored, power network
Become more meticulous to run and manage and urgent demand is proposed to governing system modeling.The state's net company standard issued for 2012《It is synchronous
Generator prime machine and its actual measurement of regulating system parameter and modeling directive/guide》In be not given and complete can characterize F grades of country joint
The standardized mathematical model of combustion engine governing system is circulated, wherein provided unit universal model and governing system part ginseng
Number table, therefore the F grades of governing system modeling work of combined cycle gas turbine can not be efficiently accomplished according to directive/guide.Domestic electrical system point
Also the universal model of combustion engine governing system each unit is not exactly defined in analysis synthesizer PSD-BPA dynamic simulation programs.Therefore
It is necessary that the governing system parameter for carrying out combustion engine is surveyed and Modeling Research, accurate Mathematical Modeling is provided for the stabilization of power grids is calculated,
The blank that grid simulation calculates Middle combustion engine governing system model is filled up, Shanghai Power Network is improved and is calculated data basis, make power network dynamic
Emulation can simulate the actual dynamic characteristic of power system, to analysis electric power system transient stability, research power grid control strategy and
Power grid security early warning control measure etc. will be played an important role.
The content of the invention
The purpose of the present invention is exactly to provide that a kind of control accuracy is high for the defect for overcoming above-mentioned prior art to exist, ring
Answer the fireballing speed regulating method based on combined cycle gas turbine system model.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of speed regulating method based on combined cycle gas turbine system model, comprises the following steps：
1) combined cycle gas turbine system model, including regulating system model unit, fuel valve electrohydraulic servo system mould are set up
Type unit and combined cycle gas turbine prime mover model unit；
2) employed in regulating system model unit and the control identical feedforward of unit actual load and feedback indifference PID
Control：Mains frequency deviation is produced primary frequency modulation changed power requirements first are added with AGC initial loads is combined
Circulation combustion engine actual load instruction, then by the instruction of combined cycle gas turbine actual load by feedforward and feedback indifference PID control
The fuel valve instruction of generation passes to fuel valve electrohydraulic servo system modeling unit；
3) switch according to fuel valve instruction control fuel valve in fuel valve electrohydraulic servo system modeling unit produces combustion
Doses signal transmission gives combined cycle gas turbine prime mover model unit；
4) combined cycle gas turbine is controlled according to fuel quantity signal in combined cycle gas turbine prime mover model unit, changes connection
The output speed of circulation combustion engine is closed, and then adjusts combined cycle gas turbine power output.
The step 1) in regulating system model unit include PID adjustment modules, feed-forward amplifier, speed discrepancy amplify
Device, first adder, second adder and the 3rd adder, described mains frequency deviation amplify product by speed discrepancy amplifier
Raw primary frequency modulation changed power requirements, then generation combined cycle gas turbine reality is added with AGC initial loads by first adder
Border load instruction, the instruction adds by the feedforward and feedback indifference PID control of PID adjustment modules and feed-forward amplifier by the 3rd
Musical instruments used in a Buddhist or Taoist mass generates fuel valve instruction and passes to fuel valve electrohydraulic servo system modeling unit.
Described fuel valve electrohydraulic servo system modeling unit includes that the electro-hydraulic servo being connected with the 3rd adder performs machine
Structure module.
Described prime mover model unit includes prime mover module being connected with Electro-Hydraulic Servo-Actuator module, described
Prime mover model unit includes that prime mover module exports the power signal of combined cycle gas turbine according to fuel quantity signal, and should
Power signal feeds back to second adder.
The transmission function of described Electro-Hydraulic Servo-Actuator module is one has the fitting function of switching characteristic.
The transmission function of described prime mover module is a first-order transfer function or by combustion engine and the load mould of steam turbine
Type transmission function is formed by stacking.
Compared with prior art, the present invention has advantages below.
First, combined cycle gas turbine system model is proposed, the sky that grid simulation calculates Middle combustion engine governing system model is filled up
Lack.
2nd, control accuracy is high, and PID indifference feedback controls are employed in regulating system model unit, reduces stable state mistake
Difference, improves system accuracy.
3rd, fast response time, employs feedforward control and the feedback control of PID indifferences simultaneously in regulating system model unit
System so that the response speed of system is further improved.
4th, applied widely, this method is not only applicable F grades of gas turbine governing system, is also suitable other similar structures
Gas turbine governing system is modeled.
Brief description of the drawings
Fig. 1 is modular concept block diagram of the invention；
Fig. 2 is MATLAB model emulations figure of the invention；
Fig. 3 is LOAD FREQUENCY control principle drawing of the invention；
Fig. 4 is a kind of F gas turbine models simulation result and test data comparison diagram under -5rpm disturbances；
Fig. 5 is a kind of F gas turbine models simulation result and test data comparison diagram under+5rpm disturbances.
Wherein, 1, rotating speed deviation module, 2, PID adjustment modules, 3, feedforward amplification module, 4, Electro-Hydraulic Servo-Actuator
Module, 5, prime mover module.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
As shown in figure 1, the invention provides a kind of Controlling model of F grades of gas turbine governing system, model mainly includes
Three model units, regulating system model unit, electrohydraulic servo system modeling unit, prime mover model unit, its FREQUENCY CONTROL
Schematic diagram in regulating system model unit as shown in figure 3, employ and the control identical feedforward of unit actual load and feedback
Indifference PID control：The primary frequency modulation changed power requirements that mains frequency deviation is produced are added with AGC initial loads first
To the instruction of combined cycle gas turbine actual load, then by the instruction of combined cycle gas turbine actual load by feedovering and feeding back indifference
The fuel valve instruction that PID control is produced passes to fuel valve electrohydraulic servo system modeling unit；In fuel valve electrohydraulic servo system
It is former dynamic that switch in model unit according to fuel valve instruction control fuel valve produces fuel quantity signal to pass to combined cycle gas turbine
Machine model unit；Combined cycle gas turbine is controlled according to fuel quantity signal in combined cycle gas turbine prime mover model unit, is changed
The output speed of combined cycle gas turbine, and then adjust combined cycle gas turbine power output.
In combustion engine stopped status, premixing valve 0-100% switch step tests are carried out, can set up electro-hydraulic according to T0, Tc and Kp2
Servo actuator model of element：Pick out T0 and Tc parameters；Then 0-5% and 5%-0 switch amplitude step tests are carried out, is led to
Cross to test result curve matching, identification obtains Kp2.
Under combustion engine normal operating condition, transmission function model of element of prime mover can be set up according to Tch：Unit band
Manual mode is put in 80% rated load, premixing valve control.Carry out 5% amplitude step switch test, record premix valve opening and connection
Cycle Unit actual power change curve is closed, and result is fitted, identification obtains Tch.
Under combustion engine normal operating condition, auto state is put in unit 80% rated load of band, premixing valve control.Carry out ±
5rpm frequency disturbances are tested, and the primary frequency modulation changed power demand that mains frequency deviation is produced is added to AGC (automatic generation controls
System) in load instruction, a combined cycle actual load is produced, instruction produces fuel by feedforward+feedback Fuel Control System
Valve is instructed, and is instructed according to fuel valve, and open and close fuel control valve (premixing valve) increases or decreases fuel quantity, and then change unit goes out
Power.Identification is fitted according to result of the test and curve, KP1, Ti1 and K2 can be picked out.According to above-mentioned parameter, combustion can be built
Machine regulating system model of element.
As shown in Fig. 2 the combustion engine governor system control model built with MATLAB according to above three model of element.Root
According to 4% rotating speed variable speed rate, it is 25 to set rotating speed deviation multiplication factor, and tach signal postpones to be 0.02 second, dead band ± 2rpm.
Model, by model emulation, obtains simulation curve in input 5rpm rotating speed disturbances, compares with combustion engine actual test curve and distinguishes
Know, obtain parameter：Kp1=0.01, Ki=0.08, K2=0.7.So far, a kind of F grades of combustion engine regulating system model buildings are finished.
The model is used, one rotating speed disturbance (＞ 2rpm) of input carries out simulation calculation, Fig. 4 and Fig. 5 simulation calculation curves obtained, with actual measurement
Result is compared, and its consistency is fairly good.
Claims (1)
1. a kind of speed regulating method based on combined cycle gas turbine system model, it is characterised in that comprise the following steps：
1) combined cycle gas turbine system model, including regulating system model unit, the fuel valve electro-hydraulic servo being sequentially connected are set up
System model unit and combined cycle gas turbine prime mover model unit, described regulating system model unit include that PID adjusts mould
Block (1), feed-forward amplifier (2), speed discrepancy amplifier (3), first adder, second adder and the 3rd adder, it is described
Fuel valve electrohydraulic servo system modeling unit includes the Electro-Hydraulic Servo-Actuator module (4) being connected with the 3rd adder, described
Prime mover model unit include prime mover module (5) for being connected with Electro-Hydraulic Servo-Actuator module (4), described prime mover
Model unit includes that prime mover module (5) exports the power signal of combined cycle gas turbine according to fuel quantity signal, and by the work(
Rate signal back second adder, mains frequency deviation is amplified generation primary frequency modulation power and is become by speed discrepancy amplifier (3)
Change requirements, then generation combined cycle gas turbine actual load is added with AGC initial loads by first adder and instruct, the instruction
Generated by the 3rd adder by the feedforward and feedback indifference PID control of PID adjustment modules (1) and feed-forward amplifier (2)
Fuel valve instruction passes to fuel valve electrohydraulic servo system modeling unit, the biography of described Electro-Hydraulic Servo-Actuator module (4)
Delivery function is one has the fitting function of switching characteristic, and the transmission function of described prime mover module (5) is a single order biography
Delivery function is formed by stacking by the load model transmission function of combustion engine and steam turbine；
2) employed in regulating system model unit and controlled with the control identical feedforward of unit actual load and feedback indifference PID
System：Mains frequency deviation is produced primary frequency modulation changed power requirements first are added to obtain combining and follow with AGC initial loads
Ring combustion engine actual load is instructed, and then the instruction of combined cycle gas turbine actual load is produced by feedovering and feeding back indifference PID control
Raw fuel valve instruction passes to fuel valve electrohydraulic servo system modeling unit；
3) switch according to fuel valve instruction control fuel valve in fuel valve electrohydraulic servo system modeling unit produces fuel quantity
Signal transmission gives combined cycle gas turbine prime mover model unit；
4) combined cycle gas turbine is controlled according to fuel quantity signal in combined cycle gas turbine prime mover model unit, changes to combine and follow
The output speed of ring combustion engine, and then adjust combined cycle gas turbine power output.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360669.1A CN104102788B (en) | 2014-07-25 | 2014-07-25 | A kind of speed regulating method based on combined cycle gas turbine system model |
| PCT/CN2014/091966 WO2016011751A1 (en) | 2014-07-25 | 2014-11-22 | Speed adjustment method based on combined circulation gas turbine system model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360669.1A CN104102788B (en) | 2014-07-25 | 2014-07-25 | A kind of speed regulating method based on combined cycle gas turbine system model |
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| CN104102788A CN104102788A (en) | 2014-10-15 |
| CN104102788B true CN104102788B (en) | 2017-06-13 |
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| CN201410360669.1A Active CN104102788B (en) | 2014-07-25 | 2014-07-25 | A kind of speed regulating method based on combined cycle gas turbine system model |
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| WO (1) | WO2016011751A1 (en) |
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| CN104102788B (en) * | 2014-07-25 | 2017-06-13 | 国网上海市电力公司 | A kind of speed regulating method based on combined cycle gas turbine system model |
| CN104847427B (en) * | 2015-04-10 | 2017-03-08 | 国家电网公司 | Two drag a heavy vapor fuel gas Combined Cycle Unit AGC control method |
| CN104950254B (en) * | 2015-05-18 | 2017-10-13 | 华北电力科学研究院有限责任公司 | The primary frequency modulation test method of Combined cycle gas-steam turbine unit, apparatus and system |
| CN105204372B (en) * | 2015-09-14 | 2018-02-09 | 国网福建省电力有限公司 | A kind of Combined cycle gas-steam turbine set speed adjustment system model and its modeling method |
| CN105811473B (en) * | 2016-05-19 | 2018-02-13 | 华能澜沧江水电股份有限公司 | A kind of power station automatic generation active power output control parameter preprocess method |
| CN107134812A (en) * | 2017-07-17 | 2017-09-05 | 广东电网有限责任公司电力科学研究院 | A kind of gas Combined Cycle Unit AGC control method and device |
| CN108321824A (en) * | 2018-03-23 | 2018-07-24 | 国家电投集团宁夏能源铝业有限公司 | " point-to-point " directly powered operation mode frequency modulation optimization method next time |
| CN109783882B (en) * | 2018-12-21 | 2022-09-09 | 哈尔滨工程大学 | Modeling simulation method for gas turbine fuel system combining matlab and flowmaster |
| CN110556840B (en) * | 2019-08-23 | 2023-04-28 | 广西电网有限责任公司电力科学研究院 | Damping control method and system for gas turbine generator set speed regulation system |
| CN110552791B (en) * | 2019-09-19 | 2021-08-20 | 国网天津市电力公司电力科学研究院 | Gas turbine valve frequency modulation continuous response control method |
| CN110867893B (en) * | 2019-11-22 | 2021-10-12 | 华北电力科学研究院有限责任公司 | Primary frequency modulation control method and device of combined cycle unit |
| CN112664511B (en) * | 2020-11-30 | 2023-06-16 | 北京精密机电控制设备研究所 | Servo mechanism energy loop modeling method suitable for pneumatic motor driving |
| CN113078658B (en) * | 2021-03-19 | 2023-09-05 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Primary frequency modulation control method based on unit output limit |
| CN113110316B (en) * | 2021-03-31 | 2022-06-14 | 华电电力科学研究院有限公司 | Primary frequency modulation control method for steam turbine of combined cycle unit |
| CN113565580A (en) * | 2021-07-08 | 2021-10-29 | 广东惠州天然气发电有限公司 | Load control system for steam turbine of split-shaft combined cycle unit |
| CN114200823B (en) * | 2021-11-26 | 2024-03-19 | 韩刚 | Primary frequency modulation control method and device for inertial-power-free synchronous unit |
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| WO2016011751A1 (en) | 2016-01-28 |
| CN104102788A (en) | 2014-10-15 |
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