CN103956948B - Intelligent AC speed changing diesel generator group - Google Patents
Intelligent AC speed changing diesel generator group Download PDFInfo
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- CN103956948B CN103956948B CN201410187761.2A CN201410187761A CN103956948B CN 103956948 B CN103956948 B CN 103956948B CN 201410187761 A CN201410187761 A CN 201410187761A CN 103956948 B CN103956948 B CN 103956948B
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Abstract
The present invention relates to a kind of intelligent AC speed changing diesel generator group.Including a diesel generating set change control system and the industrial diesel engine, threephase alternator and the frequency-fixed voltage-stable device that are connected with this diesel generating set change control system；Described diesel generating set change control system is for controlling the rotating speed of described industrial diesel engine and threephase alternator；Described industrial diesel engine is used for providing rotational power；Described threephase alternator is for being converted into electric energy by the mechanical kinetic energy of diesel engine；Described frequency-fixed voltage-stable device uses the working method of AC DC AC for the electric energy into preset frequency of being adjusted by the electric energy of change frequency, frequency-fixed voltage-stable device.Present system is greatly saved diesel generating set acquisition expenses；Reduce waste gas discharge；Improve the diesel generating set life-span；Reducing diesel generating set maintaining expense, and voltage uses DVR to be automatically adjusted, frequency uses fixed frequency device regulation, and frequency regulation and voltage-regulation are separately.
Description
Technical field
The present invention relates to a kind of intelligent AC speed changing diesel generator group.
Background technology
Diesel generating set is lightweight with it, simple in construction, power density are widely used in greatly in all trades and professions, and in real world applications, all types of loads are divided into three major types, inductive load, resistive load, capacitive load
Wherein use with inductive load the most extensive, occupy more than the 70% of all loads, such as motor, electricity-saving lamp, computer, communication class equipment.Although these inductive loads vary, dividing according to function and can be divided into two big classes, signal processing load and dynamic property load.Wherein dynamic property load occupies more than the 80% of inductive load.Such as motor.Motor drives various loaded work pieces, always revolts according to the faradic effect of Lenz's law and causes faradic reason.The transient starting electric current of motor typically can reach 5-7 times of rated current, and single motor transient starting electric current is big again, but is to be negligible from the point of view of the capacity to municipal administration electrical network.So the problem that the motor connecing municipal administration electrical network electricity consumption typically need not consider starting current.But, if driving motor with diesel generating set generating, the compressor of air conditioner of particularly drive motor-driven or the load of this kind of big instant starting currents of electric welding machine.The rated power of the diesel generating set of configuration will be than big 3-5 times of the rated power of load.Because the capacity of diesel generating set is to being the most limited from the point of view of motor load.If the configuration power of unit is larger than load rating power, then instant starting currents is excessive, and diesel engine cannot bear, and then stops working.Bigger than the rated power of motor load 3-5 times of the electromotor unit rated power that we typically configure in actual use.
Still further aspect, we most popular diesel generating set be magnetic pole logarithm be the threephase alternator group of 4 grades, the frequency of three-phase diesel generating set output electric energy preferably must be held in 50Hz, this just requires that diesel engine speed must be stablized at 1500RPM, according to horse-power formula P=9550*N*T, the power of diesel engine is multiplied by rotating speed (N) equal to 9550 and is multiplied by button square (T).The rotating speed that diesel engine for power generation can use is between 500 2200RPM, because the restriction of generating set frequency, the spendable rotating speed of diesel engine is between 900-1500, diesel engine for power generation maximum button square is at 1500RPM, industrial diesel engine maximum button square is at 1800RPM, (only injection system is different for same a Diesel engine, other is all the same), the diesel engine peak power output of engineering machinery is than diesel engine for power generation power big 15% 25%, when low speed zero load, the diesel fuel consumption of engineering machinery is lower because of rotating speed than electromotor diesel engine fuel consumption low 10% when zero load.
Because no matter alternating current generator to be kept is unloaded or the three-phase alternating current frequency of full load output is held at 50Hz, so the power that so Diesel engine is laid in can not give full play of, when electromotor zero load, because the rotating speed of 1500RPM to be kept, causing can not be with lower load running, thus many fuel consumption.
Although we configure powerful diesel generating set and ensure that the normal use of load, but bring series of problems.After motor successfully starts up, electric current revert to rapidly rated current, this operation conditions that diesel generating set will be caused to be chronically at underloading, and this long-term low load with strong power can cause following problem:
(1) diesel generating set acquisition expenses is bigger；
(2) the diesel generating set life-span is greatly shortened；
(3) consumption of diesel generating set fuel oil increases, and causes running cost huge.
Example:
There is motor-operated freezer compressor of a 7KW.50HZ.380V.3P.Rated current is about 12A, and transient starting current time is 60A.2S.
Diesel generating set rated power for this load configuration must reach 21KW.Wherein diesel engine rated power have to reach 22Kw (during 1500RPM) (peak power is 24Kw (during 1500RPM)), and compressor can be driven properly functioning.
If using transmission technology that remaining for diesel engine 25% power is brought into play, then reaching 16.5Kw (during 1500RPM) (peak power can reach 24Kw (during 2200RPM)) for diesel engine rated power in the generating set of load configuration, can to meet compressor properly functioning.
In the case of meeting load power demand equally, the diesel oil of Diesel engine rated power 16.5Kw (during 1500RPM) (peak power 24Kw (during 2200RPM)) of the same brand Diesel engine price than rated power 22Kw (during 1500RPM) (peak power 24KW (during 1500RPM)) will the most nearly 25%.
After load starting success, during oepration at full load, the generating set dump power of 16.5KW (during 1500RPM) is 7KW.The engine residual power of 22KW is 2KW.16.5KW unit fuel consumption is 3.46L/h.The generating set fuel consumption of 22KW is 4.32L/h.Expend 0.68L fuel oil although the most per hour more. do manual work identical.
Unit deteriorates due to long-term light running, burning.Parts depreciation can be caused to aggravate.Maintaining expense will be greatly increased.
Summary of the invention
It is an object of the invention to provide potential output when a kind of method of operation by diesel engine for power generation speed change excavates diesel engine high-speed cruising, thus increase the output of generating set, improve diesel generating set anti-overload ability, reduce the intelligent AC speed changing diesel generator group that diesel generating set fuel oil consumes, reduces the maintaining expense of diesel generating set.
For achieving the above object, the technical scheme is that a kind of intelligent AC speed changing diesel generator group, including a diesel generating set change control system and the industrial diesel engine, threephase alternator and the frequency-fixed voltage-stable device that are connected with this diesel generating set change control system；
Described diesel generating set change control system is for controlling the rotating speed of described industrial diesel engine and threephase alternator；When the output voltage of the threephase alternator detected increases less than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine faster rotational speed, to improve the output of industrial diesel engine；When the output voltage of the threephase alternator detected reduces more than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine rotating speed and reduces, to reduce the output of industrial diesel engine；
Described industrial diesel engine is used for providing rotational power；
Described threephase alternator is for being converted into electric energy by the mechanical kinetic energy of diesel engine；
Described frequency-fixed voltage-stable device uses the working method of AC DC AC for the electric energy into preset frequency of being adjusted by the electric energy of change frequency, this frequency-fixed voltage-stable device.
In embodiments of the present invention, described diesel generating set change control system includes a processor and the sensor assembly being connected with this processor, the starter controlling industrial diesel engine and throttle actuator；Described processor be also associated with one for for diesel generating set change control system provide electric energy power module, this power module is also associated with an accumulator；Described processor is S3C6410 processor.
In embodiments of the present invention, described sensor assembly includes the detecting voltage by three phase sensor for detecting the output of intelligent AC speed changing diesel generator group, for detecting the three-phase current detection sensor of intelligent AC speed changing diesel generator group output electric current, for detecting the engine oil pressure pickup of diesel engine oil pressure, for detecting the cooling-water temperature sensor of water temperature in diesel engine and for work machine diesel engine and the speed probe of threephase alternator rotating speed.
In embodiments of the present invention, in described industrial diesel engine is operated in the 510RPM 2200RPM range of speeds.
In embodiments of the present invention, described threephase alternator is 4 grades of threephase alternator groups, is operated between 510RPM 2200RPM；
In embodiments of the present invention, described threephase alternator is held in rated voltage 400V at 510RPM 2200RPM range of speeds inner terminal voltage, and output electric energy frequency is power frequency 17Hz-100Hz in this velocity interval.
In embodiments of the present invention, described frequency-fixed voltage-stable device includes that an intelligent control unit and provides the power subsystem of electric energy for whole frequency-fixed voltage-stable device；Described intelligent control unit is connected with detecting signal unit, rectification filtering unit, inversion voltage regulation unit, communication unit and display operating unit.
In embodiments of the present invention, described detecting signal unit is used for detecting parameters in frequency-fixed voltage-stable device；Described detecting signal unit is additionally operable to detect air themperature and relative humidity；Described rectification filtering unit for carrying out rectification, filtering by the electric energy of intelligent AC speed changing diesel generator group, and then output galvanic current can be to inversion voltage regulation unit；Described inversion voltage regulation unit is for the AC energy that direct current energy inversion is preset frequency exported by rectification filtering unit；Parameters in the system that described intelligent control unit gathers according to described detecting signal unit, is controlled described rectification filtering unit and inversion voltage regulation unit, and realizes the deficient overvoltage of system, owes overfrequency and overload protection；Parameters in the system that described detecting signal unit is gathered by described communication unit, is transferred to described display operating unit and carries out.
In embodiments of the present invention, described frequency-fixed voltage-stable device normally work input electric energy frequency range be 1Hz-200Hz, specified output frequency is 50Hz.
In embodiments of the present invention, the working method of described intelligent AC speed changing diesel generator group is as follows,
Low-speed run state:
After described intelligent AC speed changing diesel generator group starts, under the control of described diesel generating set change control system, described industrial diesel engine drives described threephase alternator to rotate, intelligent AC speed changing diesel generator group is in no-load running state, frequency-fixed voltage-stable device is entered after threephase alternator electric energy exports, electric energy adjusted by frequency-fixed voltage-stable device, exports preset frequency, the electric energy of predetermined voltage, and then electric energy flows to load；When, after load starting, diesel generating set change control system controls intelligent AC speed changing diesel generator group so that it is output follows load, give the electric energy that load offer is stable；
High-speed cruising state:
When the load that intelligent AC speed changing diesel generator group is undertaken is heavier, industrial diesel engine, under diesel generating set change control system effect, improves running speed thus increases the output of industrial diesel engine.
Compared to prior art, the method have the advantages that
1, present system is greatly saved diesel generating set acquisition expenses；Save diesel oil；Reduce waste gas discharge；Improve the diesel generating set life-span；Reduce diesel generating set maintaining expense；
2, intelligent AC speed changing diesel generator group power 8KW-2000KW total power section of the present invention can use；
3, the present invention is equipped with the multiple communication interfaces such as serial ports RS485, network, USB, GPRS, can remotely realize three " remote control " function；
4, voltage uses DVR to be automatically adjusted, and frequency uses fixed frequency device regulation, and frequency regulation and voltage-regulation are separately.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of intelligent AC speed changing diesel generator group of the present invention.
Fig. 2 is diesel generating set change control system schematic block diagram of the present invention.
Fig. 3 is frequency-fixed voltage-stable device entire block diagram of the present invention.
Fig. 4 is frequency-fixed voltage-stable device connection diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
As it is shown in figure 1, one intelligent AC speed changing diesel generator group of the present invention, including a diesel generating set change control system and the industrial diesel engine, threephase alternator and the frequency-fixed voltage-stable device that are connected with this diesel generating set change control system；
Described diesel generating set change control system is for controlling the rotating speed of described industrial diesel engine and threephase alternator；When the output voltage of the threephase alternator detected increases less than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine faster rotational speed, to improve the output of industrial diesel engine；When the output voltage of the threephase alternator detected reduces more than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine rotating speed and reduces, to reduce the output of industrial diesel engine；
Described industrial diesel engine is used for providing rotational power；
Described threephase alternator is for being converted into electric energy by the mechanical kinetic energy of diesel engine；
Described frequency-fixed voltage-stable device uses the working method of AC DC AC for the electric energy into preset frequency of being adjusted by the electric energy of change frequency, this frequency-fixed voltage-stable device.
As in figure 2 it is shown, in the present embodiment, described diesel generating set change control system includes a processor and the sensor assembly being connected with this processor, the starter controlling industrial diesel engine and throttle actuator；Described processor be also associated with one for for diesel generating set change control system provide electric energy power module, this power module is also associated with an accumulator；Described processor is S3C6410 processor.
nullProcessor output order is to the starter of industrial diesel engine and accelerator actuating mechanism，The voltage and current of sensor assembly detection threephase alternator output，When detecting that generator voltage is less than rated value，When electric current increases，The voltage and current of this detection is input to processor signal，Processor is through calculating，The numerical value of one analog quantity of output is sent to throttle actuator，Increase the accelerator open degree of industrial diesel engine，Industrial diesel engine improves the most rapidly speed，Output increases，The output making industrial diesel engine meets the drive demand of threephase alternator and (expands the peak power output of diesel engine，When sensor assembly detects that threephase alternator output electric current reduces，Voltage constant，Then the processor electric current to collecting and voltage calculate，The value that now can send an analog quantity arrives throttle actuator，Reduce industrial diesel engine accelerator open degree，Industrial diesel engine is now in underloading low speed，To save fuel.(low speed is fuel-efficient)；Above-mentioned sensor assembly is exactly constantly detection load residing for intelligent AC speed changing diesel generator group, adjusts the output of industrial diesel engine in time, thus the high-power interval that Expansion of Engineering machinery diesel engine is at a high speed, low cruise saving diesel oil.
In the present embodiment, described sensor assembly includes the detecting voltage by three phase sensor for detecting intelligent AC speed changing diesel generator group output voltage, for detecting the three-phase current detection sensor of intelligent AC speed changing diesel generator group output electric current, for detecting the engine oil pressure pickup of diesel engine oil pressure, for detecting the cooling-water temperature sensor of water temperature in diesel engine and for work machine diesel engine and the speed probe of threephase alternator rotating speed.
In the present embodiment, described industrial diesel engine is operated in the 510RPM 2200RPM range of speeds.
In the present embodiment, described threephase alternator is 4 grades of threephase alternator groups, is operated between 510RPM 2200RPM；
In the present embodiment, described threephase alternator is held in rated voltage 400V at 510RPM 2200RPM range of speeds inner terminal voltage, and output electric energy frequency is power frequency 17Hz-100Hz in this velocity interval.
As shown in Figure 3-4, in the present embodiment, described frequency-fixed voltage-stable device includes that an intelligent control unit and provides the power subsystem of electric energy for whole frequency-fixed voltage-stable device；Described intelligent control unit is connected with detecting signal unit, rectification filtering unit, inversion voltage regulation unit, communication unit and display operating unit.
In the present embodiment, described detecting signal unit is used for detecting parameters in frequency-fixed voltage-stable device；Described detecting signal unit is additionally operable to detect air themperature and relative humidity；Described rectification filtering unit for carrying out rectification, filtering by the electric energy of intelligent AC speed changing diesel generator group, and then output galvanic current can be to inversion voltage regulation unit；Described inversion voltage regulation unit is for the AC energy that direct current energy inversion is preset frequency exported by rectification filtering unit；Parameters in the system that described intelligent control unit gathers according to described detecting signal unit, is controlled described rectification filtering unit and inversion voltage regulation unit, and realizes the deficient overvoltage of system, owes overfrequency and overload protection；Parameters in the system that described detecting signal unit is gathered by described communication unit, is transferred to described display operating unit and carries out.
In the present embodiment, described frequency-fixed voltage-stable device normally work input electric energy frequency range be 1Hz-200Hz, specified output frequency is 50Hz.
In the present embodiment, the working method of described intelligent AC speed changing diesel generator group is as follows,
Low-speed run state:
After described intelligent AC speed changing diesel generator group starts, under the control of described diesel generating set change control system, described industrial diesel engine drives described threephase alternator to rotate, intelligent AC speed changing diesel generator group is in no-load running state, frequency-fixed voltage-stable device is entered after threephase alternator electric energy exports, electric energy adjusted by frequency-fixed voltage-stable device, exports preset frequency, the electric energy of predetermined voltage, and then electric energy flows to load；When, after load starting, diesel generating set change control system controls intelligent AC speed changing diesel generator group so that it is output follows load, give the electric energy that load offer is stable；
High-speed cruising state:
When the load that intelligent AC speed changing diesel generator group is undertaken is heavier, industrial diesel engine, under diesel generating set change control system effect, improves running speed thus increases the output of industrial diesel engine.
The present invention (1) makes diesel engine be operated at a high speed (more than 1500RPM) by variable-speed operation mode, fully excavate the performance of Diesel engine: former diesel generating set is all constant speed diesel generating set, keep generating set frequency stable at 50Hz, now diesel engine speed must control at 1500RPM, but our normally used diesel engine speed is between 500 2200RPM, and according to horse-power formula P=9550*N*T, the power of diesel engine is multiplied by rotating speed (N) equal to 9550 and is multiplied by button square (T), the output function that the diesel engine so run in constant speed is had also has 15%-25% not bring into play.Given full play to the power of diesel engine by variable-speed operation mode, more power can be exported with a diesel engine in the application driving threephase alternator.
(2) under generating set no-load running state, make diesel generating set low cruise, thus in the case of zero load, reduce fuel oil consumption.
(3) by frequency-fixed voltage-stable device, directly former diesel engine speed and output frequency relation are disconnected (electromotor and generator coaxle, generator speed is identical with diesel engine speed, 60f=PN, f is the frequency of electromotor output electric energy, P is the 1/2 of generator magnetic pole logarithm, N is generator speed, if electromotor is with the P=2 of 4 grades, rotating speed is 1500 turns of then f=PN/60=(2*1500)/60=50Hz), by determining frequency device, the frequency setting of change is become stable 50Hz rate-adaptive pacemaker, no matter rotary speed of diesel engine is how many, remaining that electromotor finally exports the frequency of electric energy is 50Hz.So that the rotating speed of diesel engine does not affect the frequency of final output, the final output frequency of electromotor is made to keep stable, stable at 50Hz.
(4) intelligent: generating set power-supply device is communicated with load equipment foundation by CAN, become intelligence electrical power trans mission/distribution system.
It is above presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, when produced function is without departing from the scope of technical solution of the present invention, belong to protection scope of the present invention.
Claims (5)
1. an intelligent AC speed changing diesel generator group, it is characterised in that: include a diesel generating set change control system and the industrial diesel engine, threephase alternator and the frequency-fixed voltage-stable device that are connected with this diesel generating set change control system；
Described diesel generating set change control system is for controlling the rotating speed of described industrial diesel engine and threephase alternator；When the output voltage of the threephase alternator detected increases less than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine faster rotational speed, to improve the output of industrial diesel engine；When the output voltage of the threephase alternator detected reduces more than rated value and output electric current, described diesel generating set change control system controls industrial diesel engine rotating speed and reduces, to reduce the output of industrial diesel engine；
Described industrial diesel engine is used for providing rotational power；
Described threephase alternator is for being converted into electric energy by the mechanical kinetic energy of diesel engine；
Described frequency-fixed voltage-stable device uses the working method of AC DC AC for the electric energy into preset frequency of being adjusted by the electric energy of change frequency, this frequency-fixed voltage-stable device；
Described diesel generating set change control system includes a processor and the sensor assembly being connected with this processor, the starter controlling industrial diesel engine and throttle actuator；Described processor be also associated with one for for diesel generating set change control system provide electric energy power module, this power module is also associated with an accumulator；Described processor is S3C6410 processor；Described sensor assembly includes the detecting voltage by three phase sensor for detecting intelligent AC speed changing diesel generator group output voltage, for detecting the three-phase current detection sensor of intelligent AC speed changing diesel generator group output electric current, for detecting the engine oil pressure pickup of diesel engine oil pressure, for detecting the cooling-water temperature sensor of water temperature in diesel engine and for work machine diesel engine and the speed probe of threephase alternator rotating speed；Described industrial diesel engine is operated in the 510RPM 2200RPM range of speeds；Described threephase alternator is 4 grades of threephase alternator groups, is operated between 510RPM 2200RPM；Described threephase alternator is held in rated voltage 400V at 510RPM 2200RPM range of speeds inner terminal voltage, and output electric energy frequency is power frequency 17Hz-100Hz in this velocity interval.
Intelligent AC speed changing diesel generator group the most according to claim 1, it is characterised in that: described frequency-fixed voltage-stable device includes that an intelligent control unit and provides the power subsystem of electric energy for whole frequency-fixed voltage-stable device；Described intelligent control unit is connected with detecting signal unit, rectification filtering unit, inversion voltage regulation unit, communication unit and display operating unit.
Intelligent AC speed changing diesel generator group the most according to claim 2, it is characterised in that: described detecting signal unit is used for detecting parameters in frequency-fixed voltage-stable device；Described detecting signal unit is additionally operable to detect air themperature and relative humidity；Described rectification filtering unit for carrying out rectification, filtering by the electric energy of intelligent AC speed changing diesel generator group, and then output galvanic current can be to inversion voltage regulation unit；Described inversion voltage regulation unit is for the AC energy that direct current energy inversion is preset frequency exported by rectification filtering unit；Parameters in the system that described intelligent control unit gathers according to described detecting signal unit, is controlled described rectification filtering unit and inversion voltage regulation unit, and realizes the deficient overvoltage of system, owes overfrequency and overload protection；Parameters in the system that described detecting signal unit is gathered by described communication unit, is transferred to described display operating unit and shows.
Intelligent AC speed changing diesel generator group the most according to claim 3, it is characterised in that: described frequency-fixed voltage-stable device normally work input electric energy frequency range be 1Hz-200Hz, specified output frequency is 50Hz.
Intelligent AC speed changing diesel generator group the most according to claim 4, it is characterised in that: the working method of described intelligent AC speed changing diesel generator group is as follows,
Low-speed run state:
After described intelligent AC speed changing diesel generator group starts, under the control of described diesel generating set change control system, described industrial diesel engine drives described threephase alternator to rotate, intelligent AC speed changing diesel generator group is in no-load running state, frequency-fixed voltage-stable device is entered after threephase alternator electric energy exports, electric energy adjusted by frequency-fixed voltage-stable device, exports preset frequency, the electric energy of predetermined voltage, and then electric energy flows to load；When, after load starting, diesel generating set change control system controls intelligent AC speed changing diesel generator group so that it is output follows load, give the electric energy that load offer is stable；
High-speed cruising state:
When the load that intelligent AC speed changing diesel generator group is undertaken is heavier, industrial diesel engine, under diesel generating set change control system effect, improves running speed thus increases the output of industrial diesel engine.
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| CN105576822A (en) * | 2016-02-02 | 2016-05-11 | 合肥康尔信电力系统有限公司 | Diesel generating set capable of being started stably |
| CN109525031A (en) * | 2018-09-28 | 2019-03-26 | 无锡华东自动化科技有限公司 | Diesel engine speed change power supply economizer system |
| CN113410949B (en) * | 2021-06-18 | 2022-12-13 | 桂林星辰科技股份有限公司 | Control operation method of servo energy-saving internal combustion engine generator set |
| CN114047093A (en) * | 2021-11-11 | 2022-02-15 | 四川泛华航空仪表电器有限公司 | Oil quantity measuring and converting circuit and working method thereof |
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