CN103051268A - Micro gas turbine power generation integrated control system - Google Patents
Micro gas turbine power generation integrated control system Download PDFInfo
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- CN103051268A CN103051268A CN2012105371757A CN201210537175A CN103051268A CN 103051268 A CN103051268 A CN 103051268A CN 2012105371757 A CN2012105371757 A CN 2012105371757A CN 201210537175 A CN201210537175 A CN 201210537175A CN 103051268 A CN103051268 A CN 103051268A
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Abstract
The invention discloses a micro gas turbine power generation integrated control system, which belongs to the technical field of gas turbine control. The system comprises a micro gas turbine power generation sub-system and an integrated control sub-system, wherein a storage battery and a braking resistance are added on the micro gas turbine power generation sub-system on the basis of a traditional technology; and the integrated control sub-system is formed by a central control module, a motor control module, a storage battery control module and a fuel control module. When a load is applied or removed unexpectedly, the storage battery is controlled to discharge or charge quickly, a direct-current bus voltage is controlled, and the braking resistance is started when necessary. The central control module is used for carrying out the following calculations: calculating target rotation speed according to feedback power and target power; calculating target discharge temperature according to feedback rotation speed and the target rotation speed; and calculating target fuel amount according to the target discharge temperature and feedback discharge temperature. The gas turbine rotation speed and the fuel input amount are controlled through the calculated values. The micro gas turbine power generation integrated control system is applicable to integrated control of micro gas turbines.
Description
Technical field
The present invention relates to a kind of miniature gas turbine generating integrated form control system, belong to the Gas Turbine Control Technique field.
Background technology
Miniature gas turbine is a kind of heat engine, the heat energy of fuel can be changed into mechanical energy, during miniature gas turbine work, air amount continuously, air produce high-temperature high-pressure fuel gas (exhaust of namely hereinafter mentioning) and spray from jet pipe through processes such as overcompression, burning and expansions in gas turbine.Regenerator in the miniature gas turbine can utilize the waste-heat compressed air of exhaust, has therefore greatly saved energy cost.Miniature gas turbine power station is a kind of practical, low electricity generation system of safeguarding of polluting, hang down.
In the practical application, the method that traditional miniature gas turbine control system adopts wants to reach the required rotating speed of target power gas turbine according to power output and given target power calculating often, be designated as rotating speed of target, send to motor control module, to realize the control to gas turbine rotary speed, control system sends to fuel control module according to the rotating speed of target generation target amount of gas turbine, to realize the control to the gas turbine fuel supply.
Yet traditional technical scheme is only with miniature gas turbine power output and rotating speed opening relationships, the while fuel duty is considered as the relation with rotating speed, this control system is so that in a single day the power output of generation system of micro turbine changes the variation of the rotating speed that can cause miniature gas turbine, thereby fuel duty changes thereupon, causes the miniature gas turbine job insecurity.When load variations is more violent, the operating state of gas turbine will produce serious variation.
Specifically, when heavy load loads suddenly, the micro-gas-turbine machine rotor is experienced powerful load resistance immediately, therefore the rotor speed of miniature gas turbine have the trend of abrupt deceleration immediately, and the increase of load often requires miniature gas turbine to accelerate as early as possible, to keep bearing power, this just often causes miniature gas turbine " surge " and even flame-out;
When the heavy load Condition of Sudden Unloading, this moment, gas turbine reduced suddenly owing to load pressure, the trend that overspeed is arranged, gas turbine not only will slow down or overcome because power reduces the rotating speed increase that causes this moment, but also want so that rotating speed reduces, improperly then may cause the gas turbine excess revolutions if control, finally cause engine to damage.
As seen existing Gas Turbine Control Technique can not adapt to the extreme case of sudden unloading process load, often causes the frequent flame-out of miniature gas turbine, and its core component and even whole miniature gas turbine life-span shorten greatly.
Summary of the invention
In view of this, the present invention proposes a kind of control system of miniature gas turbine, can adapt to the heavy load conversion that the generation system of micro turbine band carries, guaranteed the stability of generation system of micro turbine.
For achieving the above object, technical scheme of the present invention is:
A kind of miniature gas turbine generating integrated control system comprises miniature gas turbine power generation sub-system and integrated control subsystem; The miniature gas turbine power generation sub-system comprises miniature gas turbine, commutation inversion control module, inversion grid connection control module and DC bus-bar voltage control module; Miniature gas turbine produces electric power transfer to the commutation inversion control module, the commutation inversion control module is carried out power change and is transferred to the inversion grid connection control module by dc bus, the inversion grid connection control module connects consumer networks, and the DC bus-bar voltage control module detects d-c bus voltage value in real time; Integrated control subsystem comprises central control module, motor control module and fuel control module.
This integrated control subsystem further comprises the storage battery control module, and miniature gas turbine generating integrated control system further comprises batteries and brake resistance; Batteries connects dc bus; Brake resistance is connected on by switch between the positive and negative terminal of dc bus, and brake resistance is connected to switch, controls whether enabling of brake resistance by the folding of control switch.
Central control module obtains the real output of inversion grid connection control module and the actual speed of gas turbine, and the rotating speed of target that produces gas turbine according to control strategy sends to motor control module, produces target amount and sends to fuel control module.
The central control module Real-Time Monitoring is from the d-c bus voltage value of DC bus-bar voltage control module; When the reduction amount of d-c bus voltage value unit interval during greater than limit value, send a signal to the storage battery control module, control battery discharging detects in the trim value range that actual speed reaches setting, then stops discharge; When the rise of d-c bus voltage value unit interval during greater than limit value, send a signal to the storage battery control module, the control charge in batteries, if still being higher than voltage, DC bus-bar voltage limits, then enable brake resistance, detect in the trim value range that actual speed reaches setting, then stop charging and disconnect brake resistance.
Motor control module according to the feedback rotating speed of rotating speed of target and gas turbine, produces motor drive signal and sends to miniature gas turbine.
Fuel control module is according to the fuel input variable of target amount control miniature gas turbine.
Further, the control strategy of central control module employing is:
Central control module receives the power output of inversion grid connection control module transmission, is designated as feedback power, according to feedback power and given target power Calculation Speed, is designated as rotating speed of target, sends to motor control module;
Central control module obtains the actual speed of gas turbine, is designated as the feedback rotating speed, calculates the required exhaust temperature of gas turbine according to described feedback rotating speed by exhaust temperature and the setting relation of feedback rotating speed, is designated as target exhaust temperature; Obtain the actual exhaust air temperature of miniature gas turbine, be designated as the feedback exhaust temperature, target exhaust temperature and feedback exhaust temperature are made poor rear setting relation by exhaust temperature and fuel duty calculate target amount, send to fuel control module.
Further, central control module has external object exhaust temperature input; When central control module detects the user by external object exhaust temperature input input setting exhaust temperature, then use the setting exhaust temperature to replace target exhaust temperature to participate in the calculating of target amount.
Beneficial effect:
1, the present invention has added storage battery, when the heavy load impact, by the storage battery auxiliary power supply, thereby keep DC bus-bar voltage, make gas turbine generating system can keep bearing power, then load reduces for the resistance of micro-gas-turbine machine rotor, so rotor speed no longer includes the trend of abrupt deceleration, then in the process that control system control rotor accelerates, gas turbine can not produce " surge " and even flame-out situation; When heavy load is prominent when unloading, reduce DC bus-bar voltage by charge in batteries, share a part of power by brake resistance simultaneously, what then the rotor of miniature gas turbine can be because of load resistance sharply reduces overspeed rotation, then control system need not to reduce in a large number fuel duty, the exhaust temperature of miniature gas turbine still maintains than stable state, has avoided the flame-out phenomenon of miniature gas turbine.
2, the present invention is when controlling generation system of micro turbine, added the consideration to exhaust temperature, calculate the given exhaust temperature of keeping this feedback rotating speed based on the feedback rotating speed, and according to given exhaust temperature and feedback exhaust temperature calculating target amount, then regardless of the relative speed variation size of system, target amount is slow variation, then can realize Systems balanth work.This has guaranteed that further the present invention can adapt to the heavy load impact, prominent the extreme condition of work such as unload.
3, the present invention has outside exhaust temperature input port, can realize that the user is for the direct control of system by this port, when the user finds that relative speed variation is larger, can rule of thumb artificially input an exhaust temperature value, with the fuel metering supply, make system can keep the normal exhaust temperature, avoid occurring the unsettled situation of system works.
Description of drawings
Fig. 1 is miniature gas turbine power generation sub-system and integrated control subsystem structure chart among the present invention.
Fig. 2 is power among the present invention, rotating speed, exhaust temperature control structure figure.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The invention provides a kind of integrated control system of generation system of micro turbine, comprise miniature gas turbine power generation sub-system and integrated control subsystem.Be one embodiment of the present of invention such as Fig. 1.
A kind of miniature gas turbine generating integrated control system that present embodiment provides comprises miniature gas turbine power generation sub-system and integrated control subsystem.
Wherein, the miniature gas turbine power generation sub-system is compared with traditional generation system of micro turbine, all comprises miniature gas turbine, commutation inversion control module, inversion grid connection control module and DC bus-bar voltage control module; Miniature gas turbine produces electric power transfer to the commutation inversion control module, the commutation inversion control module is carried out power change and is transferred to the inversion grid connection control module by dc bus, the inversion grid connection control module connects consumer networks, and the DC bus-bar voltage control module detects d-c bus voltage value in real time.
Wherein the commutation inversion control module is direct current with the three-phase alternating current commutation inversion that the generator transmission comes, input to the inversion grid connection control module by dc bus, and be that three-phase alternating current is input to consumer networks by the inversion grid connection control module with dc inverter, the DC bus-bar voltage control module can kept the stable of DC bus-bar voltage in normal bearing power saltus step scope.
Wherein compare with existing generation system of micro turbine control system, this integrated control subsystem comprises central control module, motor control module and fuel control module equally.Motor control module is connected with the motor drive signal input of miniature gas turbine power generation sub-system, and fuel control module is connected with miniature gas turbine power generation sub-system fuel input by the oil gas pipeline.Central control module and commutation inversion control module, inversion grid connection control module, motor control module communication, central control module receives the actual speed from the commutation inversion control module, is designated as the feedback rotating speed; Central control module receives the power output of inversion grid connection control module transmission, is designated as feedback power.
Miniature gas turbine generating integrated control system in the present embodiment further comprises batteries and brake resistance, and integrated control subsystem further comprises the storage battery control module; Batteries connects dc bus; Brake resistance is connected on by switch between the positive and negative terminal of dc bus, and brake resistance is connected to switch, controls whether enabling of brake resistance by the folding of control switch;
Central control module wherein, obtain the real output of inversion grid connection control module and the actual speed of gas turbine, the rotating speed of target that produces gas turbine according to control strategy sends to motor control module, produces target amount and sends to fuel control module; Motor control module calculates in real time according to gas turbine rotating speed of target and the deviation of feedback rotating speed and output motor drives signal, and motor drive signal is input to the miniature gas turbine power generation sub-system.Fuel control module is according to the fuel input variable of target amount control miniature gas turbine.
Central control module and DC bus-bar voltage control module are carried out real-time communication, and Real-Time Monitoring is from the d-c bus voltage value of DC bus-bar voltage control module, and following two kinds of situations are controlled:
1, when the reduction amount of d-c bus voltage value unit interval during greater than limit value, central control module sends a signal to the storage battery control module, control battery discharging, central control module real-time detection practical rotating speed, and preset the trim value range of rotating speed, after reaching trim value range, rotating speed stops discharge; Then during this period in, native system is kept DC bus-bar voltage by the form of battery discharging, can temporarily guarantee the electric power of external load.
2, when the rise of d-c bus voltage value unit interval during greater than limit value, central control module sends a signal to the storage battery control module, the control charge in batteries, if still being higher than voltage, DC bus-bar voltage limits, then enable brake resistance, central control module real-time detection practical rotating speed stops charging and disconnects brake resistance after rotating speed reaches trim value range; Then in this setting-up time, native system can temporarily reduce DC bus-bar voltage by the form of charge in batteries, if charge in batteries also is not enough to reduce DC bus-bar voltage, the switch of closed brake resistance then, brake resistance plays shunting action at the dc bus end, make the current reduction by the inversion grid connection control module, thereby reach the purpose that reduces the power output of miniature gas turbine power generation sub-system in the short time, meet prominent requirement of unloading load.
For the 1st kind of situation, be the extreme case of impact heavy load this moment, the instantaneous reduction of DC bus-bar voltage this moment, since in the present embodiment by the storage battery auxiliary power supply, thereby can make DC bus-bar voltage maintain a stable value, make gas turbine generating system can keep bearing power, then load reduces for the resistance of micro-gas-turbine machine rotor, therefore rotor speed no longer includes the trend of abrupt deceleration, then in the process that control system control rotor accelerates, gas turbine can not produce " surge " and even flame-out situation;
For the 2nd kind of situation, be the prominent extreme case of heavy load that unloads this moment, the instantaneous raising of DC bus-bar voltage this moment, owing to reduce DC bus-bar voltage by charge in batteries in the present embodiment, share a part of power by brake resistance simultaneously, what then the rotor of miniature gas turbine can be because of load resistance sharply reduces overspeed rotation, then control system need not to reduce in a large number fuel duty, the exhaust temperature of miniature gas turbine still maintains than stable state, has avoided the flame-out phenomenon of miniature gas turbine.
Respective design and the control program of more than carrying out for the extreme condition of work of sudden unloading process load for integrated control system in the present embodiment.For making this system also can be in more stable state under normal condition of work, present embodiment has carried out following design further:
Present embodiment has improved the employed control strategy of central control module in the integrated control system, and as shown in Figure 2, the control strategy after the improvement is specific as follows:
Central control module receives the power output of inversion grid connection control module transmission, and namely feedback power according to feedback power and given target power Calculation Speed, is designated as rotating speed of target, sends to motor control module;
Central control module obtains the actual speed of gas turbine, is designated as the feedback rotating speed, calculates the required exhaust temperature of gas turbine according to the feedback rotating speed by exhaust temperature and the setting relation of feedback rotating speed, is designated as target exhaust temperature; Wherein the setting relation of exhaust temperature and feedback rotating speed to draw mode as follows: detect by experiment under different feedback rotating speeds, the different exhaust temperature data of miniature gas turbine, experimental data is carried out curve fitting, obtain exhaust temperature and the setting relation of feeding back rotating speed.
Obtain the actual exhaust air temperature of miniature gas turbine, be designated as the feedback exhaust temperature, target exhaust temperature and feedback exhaust temperature are made poor rear setting relation by exhaust temperature difference and fuel duty calculate target amount, send to fuel control module.Wherein the setting of exhaust temperature and fuel duty relation to draw mode as follows: detect by experiment under different feedback exhaust temperatures and target exhaust temperature, for making miniature gas turbine reach target exhaust temperature, employed different fuel supply data, experimental data is carried out curve fitting, obtain the setting relation of exhaust temperature difference and fuel duty.
Can be found out by above control strategy, this control system is when controlling generation system of micro turbine, added the consideration to exhaust temperature, calculate the given exhaust temperature of keeping this feedback rotating speed based on the feedback rotating speed, and according to given exhaust temperature and feedback exhaust temperature calculating target amount, then regardless of the relative speed variation size of system, target amount is slow variation, then can realize Systems balanth work.This has guaranteed that further the present invention can adapt to the heavy load impact, prominent the extreme condition of work such as unload.
The integrated control system that present embodiment proposes has outside exhaust temperature input port simultaneously, can realize that the user is for the direct control of system by this port, the user is target power of central control module input, and central control module calculates the rotating speed of target of wanting to reach the target power gas turbine according to feedback power, target power and power control strategy.
This design can make the user when finding that relative speed variation is larger, rule of thumb artificially inputs an exhaust temperature value, with the fuel metering supply, makes system can keep the normal exhaust temperature, avoids occurring the unsettled situation of system works.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a miniature gas turbine generating integrated control system comprises miniature gas turbine power generation sub-system and integrated control subsystem; Described miniature gas turbine power generation sub-system comprises miniature gas turbine, commutation inversion control module, inversion grid connection control module and DC bus-bar voltage control module; Described miniature gas turbine produces electric power transfer to the commutation inversion control module, the commutation inversion control module is carried out power change and is transferred to the inversion grid connection control module by dc bus, the inversion grid connection control module connects consumer networks, and the DC bus-bar voltage control module detects d-c bus voltage value in real time; Integrated control subsystem comprises central control module, motor control module and fuel control module, it is characterized in that, this integrated control subsystem further comprises the storage battery control module, and miniature gas turbine generating integrated control system further comprises batteries and brake resistance; Batteries connects dc bus; Brake resistance is connected on by switch between the positive and negative terminal of dc bus, and brake resistance is connected to switch, controls whether enabling of brake resistance by the folding of control switch;
Described central control module, obtain the real output of inversion grid connection control module and the actual speed of gas turbine, the rotating speed of target that produces gas turbine according to control strategy sends to motor control module, produces target amount and sends to fuel control module;
The central control module Real-Time Monitoring is from d-c bus voltage value and the actual speed of DC bus-bar voltage control module; When the reduction amount of d-c bus voltage value unit interval during greater than limit value, send a signal to the storage battery control module, control battery discharging detects in the trim value range that actual speed reaches setting, then stops discharge; When the rise of d-c bus voltage value unit interval during greater than limit value, send a signal to the storage battery control module, the control charge in batteries, if still being higher than voltage, DC bus-bar voltage limits, then enable brake resistance, detect in the trim value range that actual speed reaches setting, then stop charging and disconnect brake resistance;
Motor control module according to the feedback rotating speed of rotating speed of target and gas turbine, produces motor drive signal and sends to miniature gas turbine;
Fuel control module is according to the fuel input variable of target amount control miniature gas turbine.
2. a kind of miniature gas turbine generating integrated control system as claimed in claim 1 is characterized in that the control strategy that described central control module adopts is:
Central control module receives the power output of inversion grid connection control module transmission, is designated as feedback power, according to feedback power and given target power Calculation Speed, is designated as rotating speed of target, sends to motor control module;
Central control module obtains the actual speed of gas turbine, is designated as the feedback rotating speed, calculates the required exhaust temperature of gas turbine according to described feedback rotating speed by exhaust temperature and the setting relation of feedback rotating speed, is designated as target exhaust temperature; Obtain the actual exhaust air temperature of miniature gas turbine, be designated as the feedback exhaust temperature, target exhaust temperature and feedback exhaust temperature are made poor rear setting relation by exhaust temperature and fuel duty calculate target amount, send to fuel control module.
3. a kind of miniature gas turbine generating integrated control system as claimed in claim 1 is characterized in that,
Described central control module target exhaust temperature input; When central control module detects the user by external object exhaust temperature input input setting exhaust temperature, then use the setting exhaust temperature to replace target exhaust temperature to participate in the calculating of target amount.
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| CN107587945A (en) * | 2017-09-04 | 2018-01-16 | 中国航发南方工业有限公司 | Gas turbine temperature control equipment |
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Application publication date: 20130417 |