CN108768230A - A kind of control method of high efficiency diesel generator group - Google Patents
A kind of control method of high efficiency diesel generator group Download PDFInfo
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- CN108768230A CN108768230A CN201810725005.9A CN201810725005A CN108768230A CN 108768230 A CN108768230 A CN 108768230A CN 201810725005 A CN201810725005 A CN 201810725005A CN 108768230 A CN108768230 A CN 108768230A
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- unit
- phase difference
- capacitor
- pulse
- power factor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/46—Control of asynchronous generator by variation of capacitor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/25—Special adaptation of control arrangements for generators for combustion engines
Abstract
A kind of control method of high efficiency diesel generating set,Belong to technical field of power generation,In order to which the output power for solving diesel-driven generator is low,The step of calculating process, is complicated,Poor accuracy,The technical solution of proposition includes capacitor bank units,Capacitor switching unit,Sampling unit,Phase difference detection unit,Parameter setting unit,Comparing unit,Drive circuit unit and diesel generating set,Capacitor bank units are connect with one end of capacitor switching unit,The output end of capacitor switching unit and diesel generating set converges to be connect with one end of sampling unit afterwards,Phase difference detection unit, which is divided into, not to be connect with parameter setting unit and comparing unit,Parameter setting unit is connected with the input terminal of comparing unit,The output end of comparing unit and one end of drive circuit unit connect,The other end of drive circuit unit is connected with capacitor switching unit,The output power for solving generator is low,And accuracy greatly improves.
Description
Technical field
The present invention relates to technical field of power generation more particularly to a kind of control methods of high efficiency diesel generating set.
Background technology
Due to the fast development of industry, power supply shortage, many units are powered using diesel generating set, diesel oil
Generator majority is islet operation, and off-network works, compared with grid-connected power supply system, the capacity of diesel-electric set electric supply system
It is smaller, therefore when there is the electrical equipment of a large amount of reactive load, the output power factor of diesel-driven generator is relatively low, it is corresponding to send out
The output power of motor is less than normal, under the generating state of same capacity, loss increase, power supply efficiency is low, thus with public bulk power grid
Power quality compare, the power quality of diesel generating set is often relatively low, in traditional high efficiency generated output power control
In system, the power factor for calculating generator is needed, and the power factor of generator calculates typically generator output end by adopting
After collector, then A/D sampling modules in the signal input processing chip after acquisition carry out processing calculating, the step of such software
Rapid complicated, easily there is error, poor accuracy in calculating process, and requires height, system response time slow processing chip.
Invention content
The present invention overcomes above-mentioned the deficiencies in the prior art, provide a kind of controlling party of high efficiency diesel generating set
Method.
A kind of control device of high efficiency diesel generating set of the present invention, the technical side taken to solve the above-mentioned problems
Case, including capacitor bank units, capacitor switching unit, sampling unit, phase difference detection unit, parameter setting unit, compare
Unit, drive circuit unit and diesel generating set, the capacitor bank units are connect with one end of capacitor switching unit, electricity
Container switching unit and diesel generating set converge to be connect with one end of sampling unit afterwards, sampling unit and phase difference detection unit
Connection, phase difference detection unit, which is divided into, not to be connect with parameter setting unit and comparing unit, parameter setting unit and comparing unit
Input terminal connection, one end of the output end of comparing unit and drive circuit unit connects, the other end of drive circuit unit with
Capacitor switching unit is connected.
Further, the phase difference detection unit includes zero passage detection module and latch module, voltage end and current terminal
Voltage zero-cross pulse and current over-zero pulse and the phase difference pulse of latch module output across the output of zero passage detection module connect
It connects.
Further, the parameter setting unit is disposed with knob setting module, phase difference pulse and knob setting module
The input terminal for being each passed through 555 timer modules is connect with the given time pulse of the output end of 555 timer modules.
Further, step 1：Measure power factor PF；
Diesel generating set sends out the alternating current of fixed frequency 50HZ, and cycle T 20ms is sent out by phase difference detection unit
Pulse, according to pulse width timePower-factor angle can be calculatedSize, calculation formulaBy work(
Actual power factor can be obtained in rate factor angle
Step 2：The numerical value for setting power factor, determines the time that arteries and veins fills width by the numerical computations of power factor It is compared by filling spaced time to determining arteries and veins, controls the switching unit of capacitor respectively；
Given pulse width time can be calculated accordinglyIt is wide that power factor 0.95 corresponds to given pulse
Spend the timeFor 1ms, power factor 0.8, which corresponds to, gives pulse width timeFor 2ms, power factor 0.6, which corresponds to, gives pulse
Spaced timeFor 3m, the pulse width time exported by phase difference detection unitRespectively withWithCompared
Compared with three groups of output results compared control three group capacitor switching unit K1, K2 and K3 respectively；
Step 3：The switching state for controlling signal control capacitor, obtains given power factor；
It is PF1, PF2 and PF3 respectively to set three groups of given power factors, is less than PF1 when measuring actual power factor, by the
One group capacitor C1 puts into the output end of diesel-driven generator unit, and capacitor group C2 and C3 are not put into, when measuring practical work(
Rate factor is less than PF2, and the first group capacitor C1 and the second group capacitor C2 are put into the output end of diesel-driven generator unit, and
The C3 excisions of capacitor group, when record power factor is less than PF3, three group capacitors put into the output of diesel-driven generator unit entirely
End；
Step 4：After obtaining the output result that three groups are compared, three groups of comparison result controls capacitor switching unit respectively
K1, K2 and K3, capacitor switching unit are connect with phase difference detection unit and parameter setting unit respectively by sampling unit, phase
Potential difference detection unit and parameter setting unit, which are divided into, not to be connect with comparing unit, the phase difference pulse that phase difference detection unit is sent out
With the given arteries and veins factor of parameter setting unit setting, given arteries and veins factor is connected with timer module, sends out given time pulse, phase
Potential difference pulse and given time pulse enter comparing unit and are compared, if the phase difference burst length is less than given timing
Burst length then exports low level, and drive circuit unit is without response, if the phase difference burst length is more than the arteries and veins of given timing
It rushes the time, then exports high level, latch high level, drive circuit unit response by latch module, driving circuit works.
Beneficial effects of the present invention are：The control method of the present invention is calculated without power factor, is reduced because of power factor
The error brought of calculating and delay, no microcontroller processing, the exploitation of no software, the just not no cost of software development accordingly,
The overall cost for reducing device adds phase difference detection unit using pure hardware circuit, accurate to detect zero crossing and phase
Difference is compared using the timing of 555 timers, increases the stability of system response time and system and the accuracy of system, adopt
With parameter setting unit and three group capacitors, the control range of generated output power factor can be expanded, avoid overcompensation or owed
Compensation.
Description of the drawings
Fig. 1 is the system principle structural schematic diagram of the present invention；
Fig. 2 is the schematic diagram of the zero passage detection module and latch module of the present invention；
Fig. 3 is the schematic diagram of the Knob module and timer module of the present invention；
Fig. 4 is four kinds of switching state schematic diagrams of the capacitor group switch control of the present invention；
Fig. 5 is the voltage sampling circuit and voltage zero crossing circuit of the present invention；
Fig. 6 is the current sampling circuit and current over-zero circuit of the present invention；
Fig. 7 is the phase difference latch cicuit of the present invention；
Fig. 8 is 555 timer circuits of the present invention；
Fig. 9 is the comparison circuit of the present invention；
Figure 10 is control method figure of the present invention.
In figure：1- capacitor bank units, 2- capacitor switching units, 3- sampling units, 4- phase difference detection units, 5- ginsengs
Number setup unit, 6- comparing units, 7- drive circuit units, 8- diesel generating set 9- zero passage detection modules, 10- latch mould
Block, 11- knob setting modules, 12- timer modules.
Specific implementation mode
Specific implementation mode one, below with reference to attached drawing 1-10, the present invention is described in detail：
A kind of control device of high efficiency diesel generating set disclosed by the invention, including capacitor bank units 1, capacitor
Switching unit 2, sampling unit 3, phase difference detection unit 4, parameter setting unit 5, comparing unit 6, drive circuit unit 7 and bavin
Oily generating set 8, capacitor bank units 1 are connect with one end of capacitor switching unit 2, capacitor switching unit 2 and diesel oil hair
Motor group 8 is converged to be connect with one end of sampling unit 3 afterwards, sampling unit 3 and phase difference detection unit 4 and is connect, phase difference inspection
Survey unit 4, which is divided into, not to be connect with parameter setting unit 5 and comparing unit 6, the input terminal of parameter setting unit 5 and comparing unit 6
Connection, the output end of comparing unit 6 are connect with one end of drive circuit unit 7, the other end and capacitor of drive circuit unit 7
Switching unit 2 is connected, and sampling unit 3 sends out voltage and current signal from diesel-driven generator output end acquisition generator, and sampling is single
The input terminal of the output end connection phase difference detection unit 4 of member 3, exports by zero passage detection module 9 in phase difference detection unit 4
About the two-way pulse of voltage and current zero passage, connects latch module 10 in phase difference detection unit 4 and export about two-way pulse
Phase difference pulse, input comparing unit 6 simultaneously with parameter setting unit 5 and be compared, so control capacitor switching unit
2, sampling unit 3 acquires out voltage from diesel generating set unit leading-out terminal and is sent into phase difference detection unit with current signal
4 output voltages and current phase difference detecting circuit are passed through passes through comparing unit calculating ratio with given power factor setting timer block
Power factor control signal is relatively obtained, the switching of capacitance group is determined by power factor control signal, to realize control generator
Power factor realize improve the effective fan-out capability of unit.
Specific implementation mode two, below with reference to attached drawing 1-10, the present invention is described in detail：
Phase difference detection unit 4 includes zero passage detection module 9 and latch module 10, and voltage end and current terminal are examined across zero passage
The voltage zero-cross pulse and current over-zero pulse for surveying the output of module 9 are connect with the phase difference pulse that latch module 10 exports, and are latched
Module 10 exports two states, if voltage zero-cross pulse advance is in current over-zero pulse, phase difference output pulse, if voltage mistake
Zero pulse lags behind current over-zero pulse, then is exported without phase difference, and parameter setting unit is there are two module, Knob module 11 and fixed
When device module 12, Knob module 11 sets the power factor that generator needs, connects the potentiometer of timer, adjust potentiometer and set
Determine timer timing pulse, the two-way pulse of 9 output voltage of zero passage detection module and current over-zero simultaneously obtains voltage and current
The square-wave signal of phase difference, and then input to the calculating of comparing unit 6 and need to control power factor signal, the output of latch module 10 two
Kind state, the phase difference output pulse if current over-zero if voltage zero-cross pulse advance, if voltage zero-cross pulse lags behind electric current
Zero-crossing pulse is then exported without phase difference, and there are two module, Knob module 11 and timer module 12, knobs for parameter setting unit 5
Module 11 sets the power factor that generator needs, and connects the potentiometer of timer, adjusts potentiometer and sets timer timing arteries and veins
Punching.
Specific implementation mode three, below with reference to attached drawing 1-10, the present invention is described in detail：
Parameter setting unit 5 is disposed with knob setting module 11, and phase difference pulse and knob setting module 11 are each passed through
The input terminal of 555 timer modules 12 is connect with the given time pulse of the output end of 555 timer modules 12, and Knob module can
Setting gives the value of power factor, can set 3 groups of power factors, and timer module 12 uses 555 timers, is according to given hair
The power factor of motor carries out the timing of 555 timers of setting, generates 3 groups of timing pulses, 3 groups of given time pulses
3 groups of power factor control signals are generated compared with being calculated with phase difference pulse, power factor control signal generates 3 by driving circuit
Group drive signal, drive signal controls combination switch, and then controls the switching situation of capacitor, and parameter setting unit 5 is using rotation
Button is set, and knob sets the power factor that generator needs, and knob connects the potentiometer of 555 timers, and adjusting potentiometer can set
Fixed different timing, to realize the correspondence of the power factor of setting generator and the timing of 555 timers,
Knob module 11 can set the value of given power factor, can set 3 groups of power factors, and timer module 12 uses 555 timers,
Be according to give generator power factor carry out setting 555 timers timing, generate 3 groups of timing pulses, 3 groups
Given time pulse generates 3 groups of power factor control signals compared with being calculated with phase difference pulse, and power factor control signal passes through
Driving circuit generates 3 groups of drive signals, and drive signal controls combination switch, and then controls the switching situation of capacitor.
Specific implementation mode four, below with reference to attached drawing 1-10, the present invention is described in detail：
Step 1：Measure power factor PF；
Diesel generating set sends out the alternating current of fixed frequency 50HZ, and cycle T 20ms is sent out by phase difference detection unit 4
The pulse gone out, according to pulse width timePower-factor angle can be calculatedSize, calculation formulaBy
Actual power factor can be obtained in power-factor angle
Step 2：The numerical value for setting power factor, determines the time that arteries and veins fills width by the numerical computations of power factor It is compared by filling spaced time to determining arteries and veins, controls the switching unit of capacitor respectively；
Given pulse width time can be calculated accordinglyIt is wide that power factor 0.95 corresponds to given pulse
Spend the timeFor 1ms, power factor 0.8, which corresponds to, gives pulse width timeFor 2ms, power factor 0.6, which corresponds to, gives pulse
Spaced timeFor 3m, the pulse width time exported by phase difference detection unit 4Respectively withWithCompared
Compared with three groups of output results compared control three group capacitor switching unit 2K1, K2 and K3 respectively.
Step 3：The switching state for controlling signal control capacitor, obtains given power factor；
It is PF1, PF2 and PF3 respectively to set three groups of given power factors, is less than PF1 when measuring actual power factor, by the
One group capacitor C1 puts into the output end of diesel-driven generator unit, and capacitor group C2 and C3 are not put into, actual power factor
Less than PF2, the first group capacitor C1 and the second group capacitor C2 put into the output end of diesel-driven generator unit, and capacitor
Group C3 excisions, power factor are less than PF3, and three group capacitors put into the output end of diesel-driven generator unit, the throwing of capacitor entirely
The state of cutting is divided into four kinds of situations, 1. generally acquiescence actual power factor PF>0.95, without putting into capacitor；2. power factor
Meet 0.95>PF>0.8, the first group capacitor C1 is put into, and capacitor group C2 and C3 are not put into；3. power factor meets 0.8>
PF>0.6, the first group capacitor C1 and the second group capacitor C2 is put into, and capacitor group C3 is not put into；4. power factor meets PF
<0.6, three group capacitors are put into entirely, therefore general setting power factor PF1, PF2 and PF3 are respectively equal to 0.95,0.8 and 0.6,
By given power factor.
Step 4：After obtaining the output result that three groups are compared, three groups of comparison result controls capacitor switching unit 2 respectively
K1, K2 and K3, capacitor switching unit 2 by sampling unit 3 respectively with phase difference detection unit 4 and parameter setting unit 5
Connection, phase difference detection unit 4 and parameter setting unit 5 are divided into and are not connect with comparing unit 6, and phase difference detection unit 4 is sent out
Phase difference pulse and the given arteries and veins factor that sets of parameter setting unit 5, given arteries and veins factor be connected with timer module 12, send out
Given time pulse, phase difference pulse and given time pulse enter comparing unit 6 and are compared, if the phase difference burst length is small
In the burst length of given timing, then low level is exported, drive circuit unit 7 is without response, if the phase difference burst length is big
In the burst length of given timing, then high level is exported, high level, drive circuit unit 7 are latched by latch module 10
Response, driving circuit work.
Above example is only to the exemplary description of this patent does not limit its scope of protection, people in the art
Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.
Claims (4)
1. a kind of control device of high efficiency diesel generating set, which is characterized in that including capacitor bank units (1), capacitor
Switching unit (2), sampling unit (3), phase difference detection unit (4), parameter setting unit (5), comparing unit (6), driving electricity
Road unit (7) and diesel generating set (8), the capacitor bank units (1) connect with one end of capacitor switching unit (2),
Capacitor switching unit (2) and diesel generating set (8) are connect after converging with sampling unit (3), phase difference detection unit (4) point
It is not connect with parameter setting unit (5) and comparing unit (6), the input terminal of parameter setting unit (5) and comparing unit (6) connects
It connects, the output end of comparing unit (6) is connect with one end of drive circuit unit (7), the other end and the electricity of drive circuit unit (7)
Container switching unit (2) is connected.
2. a kind of control device of high efficiency diesel generating set according to claim 1, which is characterized in that the phase
Poor detection unit (4) includes zero passage detection module (9) and latch module (10), and voltage end and current terminal pass through zero passage detection module
(9) the voltage zero-cross pulse and current over-zero pulse exported is connect with the phase difference pulse that latch module (10) exports.
3. a kind of control device of high efficiency diesel generating set according to claim 1, which is characterized in that the parameter
Setup unit (5) is disposed with Knob module (11), and phase difference pulse and Knob module (11) are each passed through 555 timer modules
(12) input terminal is connect with the given time pulse of the output end of 555 timer modules (12).
4. a kind of control method of high efficiency diesel generating set according to claim 1, which is characterized in that
Step 1：Measure power factor PF；
Diesel generating set sends out the alternating current of fixed frequency 50HZ, and cycle T 20ms is sent out by phase difference detection unit (4)
Pulse, according to pulse width timePower-factor angle can be calculatedSize, calculation formulaBy work(
Actual power factor can be obtained in rate factor angle
Step 2：The numerical value for setting power factor, determines the time that arteries and veins fills width by the numerical computations of power factor It is compared by filling spaced time to determining arteries and veins, controls the switching unit of capacitor respectively；
Given pulse width time can be calculated accordinglyWhen power factor 0.95 corresponds to given pulse width
BetweenFor 1ms, power factor 0.8, which corresponds to, gives pulse width timeFor 2ms, power factor 0.6, which corresponds to, gives pulse width
TimeFor 3m, the pulse width time exported by phase difference detection unit (4)Respectively withWithIt is compared,
Three groups of output results compared control three group capacitor switching unit (2) K1, K2 and K3 respectively；
Step 3：The switching state for controlling signal control capacitor, obtains given power factor；
It is PF1, PF2 and PF3 respectively to set three groups of given power factors, is less than PF1 when measuring actual power factor, by first group
Capacitor C1 puts into the output end of diesel-driven generator unit, and capacitor group C2 and C3 are not put into, when measure actual power because
Number is less than PF2, and the first group capacitor C1 and the second group capacitor C2 put into the output end of diesel-driven generator unit, and capacitance
The C3 excisions of device group, when record power factor is less than PF3, three group capacitors put into the output end of diesel-driven generator unit entirely；
Step 4：After obtaining the output result that three groups are compared, three groups of comparison result control respectively capacitor switching unit (2) K1,
K2 and K3, capacitor switching unit (2) by sampling unit (3) respectively with phase difference detection unit (4) and parameter setting unit
(5) it connects, phase difference detection unit (4) and parameter setting unit (5) are divided into and are not connect with comparing unit (6), phase difference detection
The given arteries and veins factor of phase difference pulse and parameter setting unit (5) setting that unit (4) is sent out, gives arteries and veins factor and timer mould
Block (12) is connected, and sends out given time pulse, and phase difference pulse and given time pulse enter comparing unit (6) and be compared,
If the phase difference burst length is less than the burst length of given timing, low level is exported, drive circuit unit (7) is without sound
It answers, if the phase difference burst length is more than the burst length of given timing, exports high level, locked by latch module (10)
High level, drive circuit unit (7) response are deposited, driving circuit works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810725005.9A CN108768230A (en) | 2018-07-04 | 2018-07-04 | A kind of control method of high efficiency diesel generator group |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810725005.9A CN108768230A (en) | 2018-07-04 | 2018-07-04 | A kind of control method of high efficiency diesel generator group |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110132600A (en) * | 2019-05-17 | 2019-08-16 | 哈尔滨理工大学 | A kind of electrical fault prediction technique based on audio |
| CN110557062A (en) * | 2019-10-16 | 2019-12-10 | 哈尔滨理工大学 | Efficient control device for power factor of diesel generator set |
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