CN104102788A - Speed regulation method based on combined circulation gas turbine system model - Google Patents
Speed regulation method based on combined circulation gas turbine system model Download PDFInfo
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Abstract
The invention relates to a speed regulation method based on a combined circulation gas turbine system model. The speed regulation method is characterized by comprising the following steps: 1) establishing a combined circulation gas turbine system model which comprises a regulation system model unit, a fuel valve electro hydraulic servo system model unit and a combined circulation gas turbine prime mover model unit, wherein the regulation system model unit, the fuel valve electro hydraulic servo system model unit and the combined circulation gas turbine prime mover model unit are connected in sequence; 2) adopting feedforward and feedback indifference PID (Proportion Integration Differentiation) control in the regulation system model unit, adding a one-time frequency modulation power change requirement value generated by power grid frequency deviation with AGC ((Automatic Generation Control) initial load to obtain a practical load command of the combined circulation gas turbine, and carrying out the feedforward and feedback indifference PID control to the practical load command to generate a fuel value command; 3) according to the fuel valve command, generating a fuel amount signal in the combined circulation gas turbine prime mover model unit; and 4) according to the fuel amount signal, controlling the combined circulation gas turbine in the combined circulation gas turbine prime mover model unit, and regulating the output power of the combined circulation gas turbine. The invention has the advantages of being high in control precision and high in response speed.
Description
Technical field
The present invention relates to a kind of speed regulating method, especially relate to a kind of speed regulating method based on combined cycle gas turbine system model.
Background technology
East China Power Grid has marched toward many drop points direct current, the interconnected new frame of extra-high voltage alternating current-direct current, and receiving end electrical network feature is obvious, and mains frequency stable problem becomes increasingly conspicuous.Genset prime mover and governing system thereof are the important net equipment that relates to, and have significant impact to electric system mains frequency is stable, are the bases of electrical network underfrequency protection strategy study, significant to improving the frequency control system of electrical network.
In the last few years, along with the continuous increase of combustion machine quantity, its weight that accounts for the whole network installed capacity can not be ignored, and electrical network becomes more meticulous, and to governing system, modeling has proposed urgent demand to operation and management.In state's net company standard " synchronous generator prime mover and the actual measurement of regulating system parameter and modeling directive/guide " of issuing for 2012, do not provide the complete standard mathematical model that can characterize domestic F level combined cycle gas turbine governing system, wherein provide part unit universal model and governing system partial parameters table, therefore can not effectively complete according to directive/guide the governing system modeling work of F level combined cycle gas turbine.In domestic Based on Power System Analysis Software Package PSD-BPA dynamic simulation program, also clearly do not define the universal model of the each unit of combustion machine governing system.Therefore be necessary to carry out the actual measurement of governing system parameter and the Modeling Research of combustion machine, calculate accurate mathematical model is provided for the stabilization of power grids, fill up the blank that grid simulation calculates Middle combustion engine governing system model, improve Shanghai Power Network computational data basis, make electrical network dynamic simulation can simulate the actual dynamic perfromance of electric system, will play important effect to analyzing electric power system transient stability, research power grid control strategy and the measure of power grid security forewarn etc.
Summary of the invention
Object of the present invention is exactly to provide in order to overcome the defect that above-mentioned prior art exists that a kind of control accuracy is high, the speed regulating method based on combined cycle gas turbine system model of fast response time.
Object of the present invention can be achieved through the following technical solutions:
Based on a speed regulating method for combined cycle gas turbine system model, comprise the following steps:
1) set up combined cycle gas turbine system model, comprise that regulating system model unit, fuel valve electrohydraulic servo system modeling cell combination close circulation combustion machine prime mover model unit;
2) in regulating system model unit, adopted the feedforward identical with the control of unit actual load and feedback indifference PID to control: the primary frequency modulation power variation requirements and the addition of AGC initial load that first mains frequency deviation are produced obtain the instruction of combined cycle gas turbine actual load, then the instruction of combined cycle gas turbine actual load has been passed to fuel valve electrohydraulic servo system modeling unit through the fuel valve instruction of feedforward and feedback indifference PID control generation;
3) in fuel valve electrohydraulic servo system modeling unit, the switch of based on fuel valve instruction control fuel valve produces fuel quantity signal and passes to combined cycle gas turbine prime mover model unit;
4) based on fuel amount signal controlling combined cycle gas turbine in combined cycle gas turbine prime mover model unit, changes the output speed of combined cycle gas turbine, and then regulates combined cycle gas turbine output power.
Described step 1) in regulating system model unit comprise PID adjustment module, feed-forward amplifier, speed discrepancy amplifier, first adder, second adder and the 3rd totalizer, described mains frequency deviation is amplified and is produced primary frequency modulation power variation requirements through speed discrepancy amplifier, be added and produce the instruction of combined cycle gas turbine actual load by first adder and AGC initial load again, the feedforward of this instruction process PID adjustment module and feed-forward amplifier and feedback indifference PID control have produced fuel valve instruction by the 3rd totalizer and have passed to fuel valve electrohydraulic servo system modeling unit.
Described fuel valve electrohydraulic servo system modeling unit comprises the Electro-Hydraulic Servo-Actuator module being connected with the 3rd totalizer.
Described prime mover model unit comprises prime mover module being connected with Electro-Hydraulic Servo-Actuator module, described prime mover model unit comprises the power of prime mover module based on fuel amount signal output combined cycle gas turbine, and this power signal is fed back to second adder.
The transport function of described Electro-Hydraulic Servo-Actuator module is a fitting function with switching characteristic.
The transport function of described prime mover module is a single order transport function or is formed by stacking by the load model transport function of combustion machine and steam turbine.
Compared with prior art, the present invention has the following advantages.
One, propose combined cycle gas turbine system model, filled up the vacancy of grid simulation calculating Middle combustion engine governing system model.
Two, control accuracy is high, has adopted PID indifference FEEDBACK CONTROL in regulating system model unit, has reduced steady-state error, improves system accuracy.
Three, fast response time has adopted feedforward control and PID indifference FEEDBACK CONTROL in regulating system model unit simultaneously, and the response speed of system is further improved.
Four, applied widely, this method is not only suitable for F level gas turbine governing system, is also suitable for the gas turbine governing system modeling of other similar structures.
Brief description of the drawings
Fig. 1 is modular concept block diagram of the present invention;
Fig. 2 is MATLAB model emulation figure of the present invention;
Fig. 3 is LOAD FREQUENCY control principle drawing of the present invention;
Fig. 4 be a kind of F gas turbine model under-5rpm disturbance simulation result and test figure comparison diagram;
Fig. 5 be a kind of F gas turbine model under+5rpm disturbance simulation result and test figure comparison diagram.
Wherein, 1, rotating speed deviate module, 2, PID adjustment module, 3, feedforward amplification module, 4, Electro-Hydraulic Servo-Actuator module, 5, prime mover module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment:
As shown in Figure 1, the invention provides a kind of control model of F level gas turbine governing system, model mainly comprises three model units, regulating system model unit, electrohydraulic servo system modeling unit, prime mover model unit, its frequency control schematic diagram as shown in Figure 3, in regulating system model unit, adopt the feedforward identical with the control of unit actual load and feedback indifference PID to control: the primary frequency modulation power first mains frequency deviation being produced changes requirements and the addition of AGC initial load obtains the instruction of combined cycle gas turbine actual load, then the instruction of combined cycle gas turbine actual load is passed to fuel valve electrohydraulic servo system modeling unit through the fuel valve instruction of feedforward and feedback indifference PID control generation, in fuel valve electrohydraulic servo system modeling unit, the switch of based on fuel valve instruction control fuel valve produces fuel quantity signal and passes to combined cycle gas turbine prime mover model unit, based on fuel amount signal controlling combined cycle gas turbine in combined cycle gas turbine prime mover model unit, changes the output speed of combined cycle gas turbine, and then regulates combined cycle gas turbine output power.
In combustion machine stopped status, carry out premixing valve 0-100% switch step test, can set up Electro-Hydraulic Servo-Actuator model of element according to T0, Tc and Kp2: pick out T0 and Tc parameter; Then carry out 0-5% and 5%-0 switch amplitude step test, by test result curve, identification obtains Kp2.
Under combustion machine normal operating condition, can set up transport function model of element of prime mover according to Tch: unit band 80% rated load, manual mode is put in premixing valve control.Carry out 5% amplitude step switch test, record premixing valve aperture and Combined Cycle Unit real power change curve, and result is carried out to matching, identification obtains Tch.
Under combustion machine normal operating condition, unit band 80% rated load, auto state is put in premixing valve control.The test of carry out ± 5rpm frequency disturbance, the primary frequency modulation power variation demand that mains frequency deviation produces is added in the instruction of AGC (Automatic Generation Control) load, produce a combined cycle actual load, instruction produces fuel valve instruction by feedforward+feedback Fuel Control System, the instruction of based on fuel valve, open and close fuel control valve (premixing valve) increases or reduces fuel quantity, and then changes unit output.Carry out matching identification according to test findings and curve, can pick out KP1, Ti1 and K2.According to above-mentioned parameter, can build combustion machine regulating system model of element.
As shown in Figure 2, the combustion machine governing system control model building with MATLAB according to above-mentioned three model of elements.According to 4% rotating speed variable speed rate, it is 25 that rotating speed deviation enlargement factor is set, and it is 0.02 second that tach signal postpones, dead band ± 2rpm.In the disturbance of input 5rpm rotating speed, by model emulation, obtain simulation curve at model, with the identification of comparing of the actual test curve of combustion machine, obtain parameter: Kp1=0.01, Ki=0.08, K2=0.7.So far, a kind of F level combustion machine regulating system model buildings is complete.Use this model, input a rotating speed disturbance (> 2rpm) and carry out simulation calculation, obtain Fig. 4 and Fig. 5 simulation calculation curve, compare with measured result, its consistance is fairly good.
Claims (6)
1. the speed regulating method based on combined cycle gas turbine system model, is characterized in that, comprises the following steps:
1) set up combined cycle gas turbine system model, comprise that the regulating system model unit, the fuel valve electrohydraulic servo system modeling cell combination that connect successively close circulation combustion machine prime mover model unit;
2) in regulating system model unit, adopted the feedforward identical with the control of unit actual load and feedback indifference PID to control: the primary frequency modulation power variation requirements and the addition of AGC initial load that first mains frequency deviation are produced obtain the instruction of combined cycle gas turbine actual load, then the instruction of combined cycle gas turbine actual load has been passed to fuel valve electrohydraulic servo system modeling unit through the fuel valve instruction of feedforward and feedback indifference PID control generation;
3) in fuel valve electrohydraulic servo system modeling unit, the switch of based on fuel valve instruction control fuel valve produces fuel quantity signal and passes to combined cycle gas turbine prime mover model unit;
4) based on fuel amount signal controlling combined cycle gas turbine in combined cycle gas turbine prime mover model unit, changes the output speed of combined cycle gas turbine, and then regulates combined cycle gas turbine output power.
2. a kind of speed regulating method based on combined cycle gas turbine system model according to claim 1, it is characterized in that, described step 1) in regulating system model unit comprise PID adjustment module (1), feed-forward amplifier (2), speed discrepancy amplifier (3), first adder, second adder and the 3rd totalizer, described mains frequency deviation is amplified and is produced primary frequency modulation power variation requirements through speed discrepancy amplifier (3), be added and produce the instruction of combined cycle gas turbine actual load by first adder and AGC initial load again, the feedforward of this instruction process PID adjustment module (1) and feed-forward amplifier (2) and feedback indifference PID control have produced fuel valve instruction by the 3rd totalizer and have passed to fuel valve electrohydraulic servo system modeling unit.
3. a kind of speed regulating method based on combined cycle gas turbine system model according to claim 2, is characterized in that, described fuel valve electrohydraulic servo system modeling unit comprises the Electro-Hydraulic Servo-Actuator module (4) being connected with the 3rd totalizer.
4. a kind of speed regulating method based on combined cycle gas turbine system model according to claim 3, it is characterized in that, described prime mover model unit comprises prime mover module (5) being connected with Electro-Hydraulic Servo-Actuator module (4), described prime mover model unit comprises the power of prime mover module (5) based on fuel amount signal output combined cycle gas turbine, and this power signal is fed back to second adder.
5. a kind of speed regulating method based on combined cycle gas turbine system model according to claim 3, is characterized in that, the transport function of described Electro-Hydraulic Servo-Actuator module (4) is a fitting function with switching characteristic.
6. a kind of speed regulating method based on combined cycle gas turbine system model according to claim 4, it is characterized in that, the transport function of described prime mover module (5) is a single order transport function or is formed by stacking by the load model transport function of combustion machine and steam turbine.
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| 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 |
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| 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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Cited By (12)
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| CN104847427A (en) * | 2015-04-10 | 2015-08-19 | 国家电网公司 | Two-on-one heavy type gas-steam combined cycle unit AGC control method |
| CN104950254A (en) * | 2015-05-18 | 2015-09-30 | 华北电力科学研究院有限责任公司 | Primary frequency modulation testing method, device and system of gas and steam combined cycle unit |
| CN105204372A (en) * | 2015-09-14 | 2015-12-30 | 国网福建省电力有限公司 | Gas-steam combined circulation unit speed-regulating system model and model establishment method thereof |
| WO2016011751A1 (en) * | 2014-07-25 | 2016-01-28 | 国网上海市电力公司 | Speed adjustment method based on combined circulation gas turbine system model |
| CN105811473A (en) * | 2016-05-19 | 2016-07-27 | 华能澜沧江水电股份有限公司 | Active power output control parameter pre-processing method for hydropower station during automatic power generation |
| 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 |
| CN110174838A (en) * | 2019-04-30 | 2019-08-27 | 大唐陕西发电有限公司 | A kind of fired power generating unit improves the optimization method of primary frequency modulation qualification rate |
| CN110556840A (en) * | 2019-08-23 | 2019-12-10 | 广西电网有限责任公司电力科学研究院 | Damping control method and control system of gas turbine generator set speed regulating system |
| CN110552791A (en) * | 2019-09-19 | 2019-12-10 | 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 |
| CN110867893A (en) * | 2019-11-22 | 2020-03-06 | 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 |
| CN112664511A (en) * | 2020-11-30 | 2021-04-16 | 北京精密机电控制设备研究所 | Servo mechanism energy loop modeling method suitable for pneumatic motor driving |
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| CN104847427A (en) * | 2015-04-10 | 2015-08-19 | 国家电网公司 | Two-on-one heavy type gas-steam combined cycle unit AGC control method |
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| 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 |
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| 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 |
| CN112664511A (en) * | 2020-11-30 | 2021-04-16 | 北京精密机电控制设备研究所 | Servo mechanism energy loop modeling method suitable for pneumatic motor driving |
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| CN104102788B (en) | 2017-06-13 |
| WO2016011751A1 (en) | 2016-01-28 |
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