CN108702103A - Power-converting device - Google Patents
Power-converting device Download PDFInfo
- Publication number
- CN108702103A CN108702103A CN201780010117.XA CN201780010117A CN108702103A CN 108702103 A CN108702103 A CN 108702103A CN 201780010117 A CN201780010117 A CN 201780010117A CN 108702103 A CN108702103 A CN 108702103A
- Authority
- CN
- China
- Prior art keywords
- frequency
- voltage
- power
- correction
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012937 correction Methods 0.000 claims abstract description 542
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000007665 sagging Methods 0.000 claims description 43
- 238000012544 monitoring process Methods 0.000 claims description 36
- 238000003860 storage Methods 0.000 claims description 27
- 230000005611 electricity Effects 0.000 claims description 24
- 230000009467 reduction Effects 0.000 claims description 17
- 230000033228 biological regulation Effects 0.000 claims description 12
- 230000004913 activation Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 91
- 230000008569 process Effects 0.000 description 83
- 230000001276 controlling effect Effects 0.000 description 40
- 238000010586 diagram Methods 0.000 description 25
- 230000006870 function Effects 0.000 description 19
- 230000009471 action Effects 0.000 description 9
- 239000013641 positive control Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 101100028908 Lotus japonicus PCS3 gene Proteins 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Abstract
AC power will be transformed to be output to the power converter portion of the alternating current line of force from the direct current power of DC supply input by having,Control the output frequency of the AC power exported from power converter portion and the AC power control unit of output voltage,Detect the voltage detection department of the output voltage of AC power,With the current detecting part of the output current of detection AC power,AC power control unit in the alternating current line of force puts into load and to after loading and outputing AC power with rated frequency and rated voltage,The output current that the output voltage and current detecting part detected based on voltage detection department is detected,The output frequency for making AC power and output voltage are implemented after the droop control that rated frequency and rated voltage reduce respectively,Implement the Correction and Control that output frequency and output voltage are gradually adapted to rated frequency and rated voltage.
Description
Technical field
The present invention relates to power-converting devices.
Background technology
With the introducing recently to the raising of the care of regenerative resource, government to electric power purchase system, such as it is utilized
Solar cell (PV:Photovoltaic solar power system) is just in rapid proliferation.As long as the system has solar radiation
It can be readily available electric power, on the contrary according to solar radiation condition, be easy to be influenced by power fluctuation, night cannot be sent out
Electricity.Therefore propose a kind of following solar cell-accumulator cooperative system, that is, will put aside electric power accumulator and
Solar cell is attached, and the variation of the electric power generated by solar cell is handled by the charge and discharge to accumulator.
It is important that a kind of electric power tune as power-converting device in the structure of solar cell-accumulator cooperative system
Section system (Power Conditioning System:Also it is expressed as PCS sometimes below) device.PCS is arranged in solar-electricity
Between the DC power supplies such as pond, accumulator and the alternating current line of force, it will be transformed to AC power from the direct current power of direct-current power supply,
And supply AC power to the important load for being connected to the alternating current line of force.
In power-converting device, in the case where making multiple power-converting devices (PCS etc.) operate parallel, it is contemplated that make each
A power-converting device liberally shares contribution electric power, and to implement to be referred to as the control of droop control, the droop control is
Intentionally make the frequency for being supplied to the AC power of load and voltage from specified reduction (sagging).
Patent Document 1 discloses a kind of control methods, by changing as defined in the sag of chain progress to frequency, voltage
Droop characteristic, to effectively utilize the electric power of DC power supply (generator).
Citation
Patent document
Patent document 1:International Publication No. 2014/098104
Invention content
The subject that the invention solves
If implementing droop control, the frequency of the AC power of load, voltage are supplied to less than specified.Therefore, sagging spy
Property is set to converge in the permissible range of load.But even if droop characteristic in the permissible range of load, according to connection
Load difference, there is also influenced by the frequency after sagging, voltage.For example, being synchronized in load use electronic
In the case that machine carries out timing, it can be put aside as timing error by the part for the frequency that droop control reduces.
If in addition, setting droop characteristic in order to inhibit the influence of droop control and to reduce sag of chain, droop control
Caused frequency and voltage is inhibited from specified offset.But implement it is with other power-converting devices and
In the case of row operating, each power-converting device can be caused, which to implement the fair control accuracy shared, to be reduced.
Therefore, the object of the present invention is to provide a kind of power-converting devices for the influence that can reduce droop control.
Means for solving the problems
In order to solve the above problems, have:Power converter portion will be transformed to hand over from the direct current power of DC supply input
Galvanic electricity power and be output to the alternating current line of force;AC power control unit controls the defeated of the AC power exported from power converter portion
Go out frequency and output voltage;Voltage detection department detects the output voltage of AC power;And current detecting part, detection are handed over
The output current of galvanic electricity power, AC power control unit load be put to the alternating current line of force and to load with rated frequency with
And after rated voltage outputs AC power, the output voltage and current detecting part that are detected based on voltage detection department are detected
Output current, implementation so that the output frequency of AC power and output voltage is reduced respectively from rated frequency and rated voltage
Droop control after, implement gradually for output frequency and output voltage to be adapted to the amendment of rated frequency and rated voltage
Control.
Invention effect
If simpling illustrate the effect that representational invention is obtained in invention disclosed herein, following institute
It states.
That is, representational embodiment according to the present invention, is capable of providing the electric power for the influence for reducing droop control
Converting means.
Description of the drawings
Fig. 1 is the figure for showing to have used an example of the system of the power-converting device involved by embodiments of the present invention 1.
Fig. 2 is the figure of an example for the structure for showing the power-converting device in embodiments of the present invention 1.
Fig. 3 is the figure for illustrating droop characteristic.
Fig. 4 is the figure of an example for the structure for showing the command value correction portion in Correction and Control portion.
Fig. 5 is the figure for showing FREQUENCY CONTROL and the involved flow chart of voltage control in embodiments of the present invention 1.
Fig. 6 is the figure of the droop characteristic involved by the FREQUENCY CONTROL that shows in embodiments of the present invention 1.
Fig. 7 is the figure for showing the involved droop characteristic of voltage control in embodiments of the present invention 1.
Fig. 8 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in embodiments of the present invention 1.
Fig. 9 is the figure for showing the involved sequence diagram of voltage control in embodiments of the present invention 1.
Figure 10 is the figure of an example for showing the system involved by embodiments of the present invention 2.
Figure 11 is to show the FREQUENCY CONTROL in embodiments of the present invention 2 and the flow chart involved by voltage control
Figure.
Figure 12 is the figure of the droop characteristic involved by the FREQUENCY CONTROL that shows in embodiments of the present invention 2.
Figure 13 is the figure for showing the involved droop characteristic of voltage control in embodiments of the present invention 2.
Figure 14 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in embodiments of the present invention 2.
Figure 15 is the figure for showing the involved sequence diagram of voltage control in embodiments of the present invention 2.
Figure 16 is the figure of an example for the structure for showing the power-converting device involved by embodiments of the present invention 3.
Figure 17 is the figure of an example for the structure for showing the command value correction portion in embodiments of the present invention 3.
Figure 18 is the figure of an example for the structure for showing the Cooperation controlling portion in embodiments of the present invention 3.
Figure 19 is to show the FREQUENCY CONTROL in embodiments of the present invention 3 and the flow chart involved by voltage control
Figure.
Figure 20 is the figure of the droop characteristic involved by the FREQUENCY CONTROL that shows in the case that time constant is big.
Figure 21 is the figure for showing the involved droop characteristic of voltage control in the case that time constant is big.
Figure 22 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in the case that time constant is big.
Figure 23 is the figure for showing the involved sequence diagram of voltage control in the case that time constant is big.
Figure 24 is the figure of the droop characteristic involved by the FREQUENCY CONTROL that shows in the case that time constant is small.
Figure 25 is the figure for showing the involved droop characteristic of voltage control in the case that time constant is small.
Figure 26 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in the case that time constant is small.
Figure 27 is the figure for showing the involved sequence diagram of voltage control in the case that time constant is small.
Figure 28 is the figure of an example for the structure for showing the power-converting device involved by embodiments of the present invention 4.
Figure 29 is the figure of an example for showing the command value correction portion structure in Correction and Control portion.
Figure 30 is involved by FREQUENCY CONTROL and voltage control when showing the parallel operating in embodiments of the present invention 4
Flow chart figure.
Figure 31 is the droop characteristic involved by FREQUENCY CONTROL when showing the parallel operating in embodiments of the present invention 4
Figure.
Figure 32 is the involved droop characteristic of voltage control when showing the parallel operating in embodiments of the present invention 4
Figure.
Figure 33 is the sequence diagram involved by FREQUENCY CONTROL when showing the parallel operating in embodiments of the present invention 4
Figure.
Figure 34 is the involved sequence diagram of voltage control when showing the parallel operating in embodiments of the present invention 4
Figure.
Figure 35 is the figure of an example for showing the system involved by embodiments of the present invention 5.
Figure 36 is the figure of an example for showing the system involved by embodiments of the present invention 6.
Figure 37 is the figure of an example for showing the system involved by embodiments of the present invention 7.
Figure 38 be show the present inventor discussion power-converting device in frequency and voltage control involved by when
The figure of sequence figure.
Figure 39 is the characteristic for showing output frequency and output voltage in the power-converting device of the present inventor's discussion
Figure.
Figure 40 is the sagging spy for showing output frequency and output voltage in the power-converting device of the present inventor's discussion
The figure of property.
Figure 41 be show the present inventor discussion power-converting device in frequency and voltage control involved by when
The figure of sequence figure.
Figure 42 is the figure for the droop characteristic for showing the output frequency in the power-converting device of the present inventor's discussion.
Figure 43 is the figure for the droop characteristic for showing the output voltage in the power-converting device of the present inventor's discussion.
Figure 44 be show the present inventor discussion power-converting device in FREQUENCY CONTROL involved by sequence diagram figure.
Figure 45 is the figure for showing the involved sequence diagram of voltage control in the power-converting device of the present inventor's discussion.
Specific implementation mode
Hereinafter, illustrating embodiment using attached drawing.In addition, in whole figures for illustrating embodiment, as original
Then, same symbol is marked to the same part, and omits its repeated explanation.
(embodiment 1)
In the present embodiment, to power-converting device is used alone the case where, illustrates.
[Device constitutes ]
Fig. 1 is the figure of an example for the system for showing to have used the power-converting device involved by present embodiment.Electric power becomes
Changing device 200 connects DC power supply 111 in DC side, and the alternating current line of force 120 is connected in exchange side.Power-converting device 200
The direct current power inputted from DC power supply 111 is transformed to AC power and is output to the alternating current line of force 120.As power converter
Device 200, such as become direct current power used as a kind of electric power regulating system of power-converting device (PCS) or have
It is changed to the various devices of the function of AC power.Load 130 receives the AC power converted by power-converting device 200
Supply and drive.
Power-converting device 200 has power converter portion 210, voltage to frequency control unit 220, droop control portion 230 and repaiies
Positive control portion 240.
Fig. 2 is the figure of an example for the structure for showing the power-converting device 200 in present embodiment.Power-converting device
200 have power converter portion 210, voltage detection department 214, current detecting part 215 and AC power control unit 250.
The direct current power inputted from DC power supply 111 is transformed to AC power and is output to exchange by power converter portion 210
Power line 120.AC power control unit 250 controls the output frequency of AC power exported from power converter portion 210 and defeated
Go out voltage.Power converter portion 210 has semiconductor element 211, reactor 212, transformer 213, and composition converts direct current power
For the inverter of AC power.Semiconductor element 211 is dynamic by the switch of the control based on aftermentioned voltage to frequency control unit 220
Make, pulse width modulation is carried out to the direct current power of input.Reactor 212 carries out pulse width from semiconductor element 211
Modulated electric power removes higher hamonic wave.By these processes, direct current power is transformed to the AC power of 3 phases.Transformer 213 will
It is defined output voltage to have carried out the modulated alternating voltage transformation of pulse width.The AC power quilt of power converter is carried out
It is output to the alternating current line of force 120.The output frequency of the AC power of output is, for example, 50Hz, 60Hz etc..In addition, the exchange of output
The output voltage of electric power is, for example, 100V, 200V etc..
Voltage detection department 214 detects the output voltage of AC power.Specifically, the detection of voltage detection department 214 is output to
The output voltage of the AC power of the alternating current line of force 120.
Current detecting part 215 detects the output current of AC power.Specifically, the detection of current detecting part 215 is output to
The output current of the AC power of the alternating current line of force 120.
AC power control unit 250 is based on voltage after so that AC power is exported with rated frequency and rated voltage
The output current that the output voltage and current detecting part 215 that test section 214 detects detect, implementing makes AC power
Respectively after the droop control that rated frequency and rated voltage reduce, implementing will output frequency for output frequency and output voltage
Rate and output voltage are gradually adapted to the Correction and Control of rated frequency and rated voltage.
AC power control unit 250 has droop control portion 230, Correction and Control portion 240, voltage to frequency control unit 220.
Droop control portion 230 based on output voltage and output current come export AC power contribution active power and
Reactive power is contributed, based on frequency droop rate as defined in the frequency reduction amount by per unit active power and contribution wattful power
Rate, export makes the frequency droop amount that output frequency is reduced from rated frequency, based on the decrease amount av by per unit reactive power
The sagging rate of defined voltage and contribution reactive power, export make the voltage sag of chain that output voltage is reduced from rated voltage.
Specifically, droop control portion 230 has the tribute that AC power is exported based on output voltage and output current
It offers active power and contributes the electric power operational part 231 of reactive power, to contributing active power by electric power operational part 231 is derived
It is multiplied with frequency droop rate to export frequency droop amount, to by the derived contribution reactive power of electric power operational part 231 and electricity
The vertical rate of pressure is multiplied to export voltage sag of chain.
Electric power operational part 231 is for example examined by the output voltage and current detecting part 215 that are detected to voltage detection department 214
The size of the inner product for the output current measured carries out operation, to export contribution active power.Electric power operational part 231 is for example by right
The size of the apposition for the output current that the output voltage and current detecting part 215 that voltage detection department 214 detects detect carries out
Operation, to export contribution reactive power.
Fig. 3 is the figure for illustrating droop characteristic.Droop control is for example to imagine multiple power-converting devices 200 being connected to friendship
The galvanic electricity line of force 120 and implement from multiple power-converting devices 200 export AC power parallel operating the case where, in order to make respectively
A power-converting device 200 implements the fair control shared and implemented.
(a) of Fig. 3 is the figure for showing variation of the frequency relative to active power.Frequency droop rate is per unit active power
Frequency reduction amount, the slope of straight line shown in (a) by Fig. 3 provides.Frequency droop rate is set as example so that frequency
Reduction amount (frequency droop rate) converge on the range being allowed relative to the maximum active power of power-converting device 200
It is interior.
(b) of Fig. 3 is the figure for showing variation of the voltage relative to reactive power.The sagging rate of voltage is per unit reactive power
Voltage reduction amount, the slope of straight line shown in (b) by Fig. 3 provides.The sagging rate of voltage is set as example so that voltage
Reduction amount (the sagging rate of voltage) converge on the range being allowed relative to the maximum reactive power of power-converting device 200
It is interior.
Each portion in droop control portion 230 and each function are constituted, can be constituted using hardware or software.It is sagging constituting
In the case that each portion of control unit 230 and each function are by software realization, for example, droop control portion 230 includes CPU (not shown)
(or application specific processor), CPU execute the program that is stored in memory (not shown) etc. to realize each portion and each function.
Correction and Control portion 240 is set based on frequency correction value for will be by output that droop control reduces frequency
Rate be gradually adapted to rated frequency during output frequency carry out as defined in frequency targets values, and based on voltage correction value come
It sets for the output electricity during to will gradually be adapted to rated voltage by the output voltage that droop control reduces
Pressure carries out defined voltage-target.
Correction and Control portion 240 is described in detail.
Correction and Control portion 240 has:Condition monitoring portion 241 is exported, it is derived to electric power operational part 231 to contribute active power
And contribution reactive power is monitored;Data store 242 stores under preset rated frequency, rated voltage, frequency
The rate of hanging down and the sagging rate of voltage;With command value correction portion 243.
It is various to be stored in rated frequency, rated voltage, frequency droop rate and sagging rate of voltage of data store 242 etc.
Data, such as inputted by operation panel 290.
Operation panel 290 accepts the various data such as rated frequency, rated voltage, frequency droop rate and the sagging rate of voltage
Input, and the various data inputted are output to data store 242.The storage of data store 242 is exported from operation panel
Various data.
Operation panel 290 has display unit (not shown), is configured to that the contribution that condition monitoring portion 241 monitors will be exported
Various data such as active power, contribution reactive power etc. are shown in display unit.
Fig. 4 is the figure of an example for the structure for showing the command value correction portion in Correction and Control portion.Command value correction portion 243 has
Standby frequency first-order lag element (frequency hysteresis element) 244 ω, voltage first-order lag element (voltage delay element) 244v.Instruction
Value correction portion 243 is to the contribution active power for exporting 241 monitoring of condition monitoring portion and the frequency being stored in data store 242
Sagging rate is multiplied (original text:Plot is calculated) and frequency correction value is exported, frequency correction value is input to frequency first-order lag element
244 ω will be set from the gradual correction value of frequency that 244 ω of frequency first-order lag element is exported plus value obtained from rated frequency
For output frequency to be gradually adapted to the frequency targets value of the output frequency during rated frequency for regulation.Here, make
For the method for making correction value gradually change, first-order lag element is used, but for identical purpose, second order can also be used
Lag the lag element of element or higher order.
Command value correction portion 243 stores the contribution reactive power of 241 monitoring of output condition monitoring portion with data are stored in
The sagging rate of voltage in portion 242 is multiplied and exports voltage correction value, and voltage correction value, which is input to voltage first-order lag, to be wanted
Plain 244v will be set from the gradual correction value of voltage that voltage first-order lag element 244v is exported plus value obtained from rated voltage
For output voltage to be gradually adapted to the voltage-target of the output voltage during rated voltage for regulation.
244 ω of frequency first-order lag element and voltage first-order lag element 244v is based on Correction and Control portion 240 for making
Correction and Control gradually implement, that is, rallentando implement.244 ω of frequency first-order lag element and voltage first-order lag are wanted
Plain 244v is constituted such as by low-pass filter or the digital filter with the function same with it, and low-pass filter is by resistance
And the compositions such as capacitor.If obstructed 244 ω of overfrequency first-order lag element and voltage first-order lag element 244v and implement
Correction and Control then for example implements Correction and Control with the time of number 10us~100us.In contrast, if passing through frequency first-order lag
244 ω of element and voltage first-order lag element 244v implements Correction and Control, then for example with time of number ms~number 100ms reality
Apply Correction and Control.Therefore, compared to the feelings of obstructed 244 ω of overfrequency first-order lag element and voltage first-order lag element 244v
Condition takes an undesirably long time to implement Correction and Control.Hereby it is possible to inhibit the contribution active power before and after Correction and Control on one side
And Correction and Control is implemented in the variation of contribution reactive power on one side.
Each portion in Correction and Control portion 240 and each function are constituted, can be constituted using hardware or software.With software
In the case of realizing each portion for constituting Correction and Control portion 240 and each function, for example, Correction and Control portion 240 includes (not shown)
CPU (or application specific processor), CPU execute the program that is stored in memory (not shown) etc. to realize each portion and each work(
Energy.
In addition, Correction and Control portion 240 can also for example use the Programmable logical controller for being equipped on power-converting device 200
Device (Programable Logic Controller:Hereinafter sometimes referred to as PLC) it realizes.
Voltage to frequency control unit 220, which is based on down well-behaved amount and voltage sag of chain under 230 calculated frequency of well-behaved control unit, to be come
Implement droop control, after droop control, the frequency targets value and voltage-target set based on Correction and Control portion 240,
Implement the Correction and Control that output frequency and output voltage are gradually adapted to rated frequency and rated voltage.
Voltage to frequency control unit 220 has feedback control section 221.Voltage to frequency control unit 220 will be stored in data storage
Rated frequency and rated voltage in portion 242 are input to feedback control section as frequency instruction value and voltage instruction value
221, feedback control section 221 is based on the frequency instruction value and voltage instruction value inputted so that with rated frequency and specified
Voltage output AC power.
Later, voltage to frequency control unit 220 will in droop control portion 230 derived frequency droop amount plus being stored in number
Feedback control section 221 is input to as frequency instruction value according to value obtained from the rated frequency in storage part 242, and will be under
Derived voltage sag of chain is made plus value obtained from the rated voltage in data store 242 is stored in vertical control unit 230
It is input to feedback control section 221 for voltage instruction value, feedback control section 221 is based on the frequency instruction value and voltage inputted
Command value implements droop control.
Frequency targets value that voltage to frequency control unit 220 sets the command value correction portion 243 in Correction and Control portion 240 and
Voltage-target is input to feedback control section 221 as frequency instruction value and voltage instruction value, and feedback control section 221 is based on
The frequency instruction value and voltage instruction value inputted is implemented output frequency and output voltage being gradually adapted to rated frequency
And the Correction and Control of rated voltage.
Feedback control section 221 is connect with voltage detection department 214, the output voltage that monitoring voltage detection department 214 detects.Instead
Output voltage of the control unit 221 based on monitoring is presented, pulse-modulated signal is controlled so that output voltage becomes assigned voltage.In addition,
Feedback control section 221 is connect with current detecting part 215, the output voltage that standby current test section 215 detects.Feedback control section
221 output currents based on monitoring control pulse-modulated signal so that output voltage becomes assigned voltage.Output voltage due to
It flows through the electric current of reactor 212 and reduces, thus feedback control section 221 is compensated according to the information from current detecting part 215
Reduction part.Therefore, feedback control section 221 carries out feedback control to output voltage and output current.Accordingly, steadily
Export the contribution active power and contribution reactive power of AC power.
Each portion of voltage to frequency control unit 220 and each function are constituted, it can be by hardware or software sharing.With software
In the case of realizing each portion for constituting voltage to frequency control unit 220 and each function, for example, voltage to frequency control unit 220 includes
CPU (or application specific processor) (not shown), CPU execute the program that is stored in memory (not shown) etc. realize each portion with
And each function.
[The Kong Zhifangfa ] of frequency and voltage;
Here, the control method of frequency and voltage in the case of exclusive use power-converting device 200 is said
It is bright.
Fig. 5 is the figure for showing FREQUENCY CONTROL and the involved flow chart of voltage control in present embodiment.Fig. 6 is to show
Go out the figure of the droop characteristic involved by the FREQUENCY CONTROL in present embodiment.Fig. 7 is the voltage control shown in present embodiment
The figure of involved droop characteristic.Fig. 8 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in present embodiment.Fig. 9 is
The figure of the involved sequence diagram of voltage control in present embodiment is shown.
In addition, hereinafter, for convenience of description, the controlling cycle of power converter portion (inverter) 210 being set as Δ t, will be repaiied
The controlling cycle Δ T in positive control portion (PLC) is set as 4 Δ t.In addition, 244 ω of frequency first-order lag element and voltage single order is stagnant
The time constant of element 244v is set as 4 Δ T afterwards.
As shown in figure 5, power-converting device 200 is by implementing rated output process S10, frequency droop controls process S20,
The each process of frequency Correction and Control process S25, voltage droop control process S30, voltage Correction and Control process S35 are handed over to control
The output frequency and output voltage of galvanic electricity power.It is included in a series of sequence of " beginning " to " end " shown here as whole processes
Example in row.When starting sequence, rated output process S10 is performed every time, and sagging process S20, S30 is with certain proportion
Thinization executes.That is, in the case of with N thinization, do nothing in N-1 calling, and just starts to hold in n-th
Row process content.In turn, process S25, S35 is corrected also to execute with certain proportion thinization.In addition, these processes need not also become one
The sequence of series, can also be the mode individually called from the supervisory sequence of multitask OS etc..At that time, each process is called
Frequency is also important by each process difference.In the explanation of this example, it is contemplated that be included in a series of sequence, and imagine
Rated output process S10 and sagging process S20, S30 execute process content with identical timing (timing), correct process S25,
Thinization executes S35 to a certain extent.
[Rated output process S10]
First, illustrate rated output process S10.Before input load 130, make 200 autonomous operation of power-converting device.
In this case, the contribution active power and contribution reactive power of power-converting device 200 are all " 0 ".At this point, such as Fig. 6
(a), shown in (a) of Fig. 7, output frequency and output voltage are all specified.
Specifically, command value correction portion 243 reads the rated frequency stored in data store 242 and specified electricity
Pressure.At this point, because be Correction and Control implementation before, the correction value of frequency and voltage is all " 0 ".Therefore, command value is repaiied
Frequency targets value and voltage-target are set as rated frequency and rated voltage by positive portion 243.Correction and Control portion 240 is to frequently
Rate voltage control division 220 is exported as frequency targets value and the rated frequency and rated voltage of voltage-target.
In addition at this point, because be droop control implementation before, the sag of chain of frequency and voltage is all " 0 ".Therefore,
Frequency instruction value and voltage instruction value are set as rated frequency and rated voltage by voltage to frequency control unit 220.Frequency electricity
The rated frequency for being set as frequency instruction value and voltage instruction value and rated voltage are input to feedback control by pressure control unit 220
Portion 221 processed.Feedback control section 221 makes AC power with specified frequency based on the frequency instruction value and voltage instruction value that are inputted
Rate and rated voltage output.
If in moment T1 input load 130, power converter portion (inverter) 210 makes during its controlling cycle Δ t
Current direction loads and maintains alternating voltage.Then, it is used as contribution to have as shown in figure 8, power-converting device 200 exports P ω
Work(power.In addition, as shown in figure 9, power-converting device 200 exports Qv as contribution reactive power.
[Frequency droop controls process S20]
If exporting AC power, droop control portion 230 implements droop control to frequency and voltage.It is sagging implementing
After control, Correction and Control is implemented to frequency and voltage.In droop control and Correction and Control, concurrently implement to frequency with
And the control of voltage, but here for convenience of description, after illustrating to the droop control and Correction and Control of frequency, explanation
To the droop control and Correction and Control of voltage.
Here, frequency droop control process S20 is illustrated.If input load 130 simultaneously exports AC power, such as scheme
Shown in 6 (b), Fig. 8, the implementation of power-converting device 200 makes the droop control that output frequency is reduced from rated frequency.
Specifically, droop control portion 230 is had based on output voltage and output current come the contribution for exporting AC power
Work(power (P ω), based on frequency droop rate as defined in the frequency reduction amount by per unit active power and contribution active power
(P ω), to export the frequency droop amount (- ω) for making output frequency be reduced from rated frequency.
For example, output voltage and current detecting part 215 that electric power operational part 231 is detected based on voltage detection department 214
The output current detected exports the contribution active power (P ω) of AC power.Droop control portion 230 reads data store
The frequency droop rate stored in 242, to being stored by the derived contribution active power (P ω) of electric power operational part 231 and from data
The frequency droop rate that portion 242 is read is multiplied to export frequency droop amount (- ω).Droop control portion 230 is to voltage to frequency control
Portion 220 processed exports so derived frequency droop amount (- ω).
Correction and Control portion 240 exports the rated frequency as frequency targets value to voltage to frequency control unit 220.
Voltage to frequency control unit 220 adds the frequency droop amount (- ω) inputted from droop control portion 230 from Correction and Control
Value is input to feedback control section 221 as frequency instruction value obtained from the rated frequency that portion 240 inputs.Feedback control section
221 implement the droop control for making frequency from specified reduction frequency droop amount (- ω) based on the frequency instruction value inputted.Such as figure
Shown in 8, voltage to frequency control unit 220 implements droop control during the controlling cycle Δ t of inverter.
[Frequency Correction and Control process S25]
Next, illustrating frequency Correction and Control process S25.After implementing droop control, power-converting device 200 is from Fig. 8
At the time of T2 rise and implement gradually for frequency to be adapted to the Correction and Controls of rated frequency.Specifically, Correction and Control portion 240 is by frequency
Sag of chain (- ω) is as the frequency correction value (+ω) that output frequency is adapted to rated frequency, based on for being repaiied to being based on frequency
Positive value (+ω) output frequency is gradually adapted to rated frequency during output frequency carry out as defined in gradually correction value (+
Δ ω), setpoint frequency desired value.
For example, command value correction portion 243 is stored to the contribution active power of 241 monitoring of output condition monitoring portion and from data
The frequency droop rate that portion 242 is read is multiplied to export frequency correction value (+ω), and frequency correction value (+ω) is input to frequency
244 ω of rate first-order lag element.For 244 ω of frequency first-order lag element based on the frequency correction value inputted, output frequency is gradual
Correction value (+Δ ω).Command value correction portion 243 by the gradual correction value of frequency exported from 244 ω of frequency first-order lag element (+
Δ ω) output frequency is gradually corrected plus being set as regulation from value obtained from the rated frequency that data store 242 is read
To the frequency targets value of the output frequency during rated frequency.The frequency targets that command value correction portion 243 will be set here
Value is output to voltage to frequency control unit 220.
Voltage to frequency control unit 220 is using the frequency targets value inputted from command value correction portion 243 as frequency instruction value
Implement the Correction and Control of output frequency.At this point, as shown in (c) of Fig. 6, Fig. 8, output frequency is from starting Correction and Control initial
The controlling cycle Δ t of inverter increase Δ ω.
In the controlling cycle Δ T of next PLC, frequency first-order lag element 244 ω output (+2 Δ ω) as by
Gradually correction value.Voltage to frequency control unit 220 further implements the Correction and Control of the frequency of the parts Δ ω based on the gradual correction value.
By this Correction and Control repeatedly, to such as Fig. 6 (d), shown in Fig. 8, feedback control section 221 is to output frequency implementation+ω amounts
Correction and Control.If the controlling cycle Δ T of the PLC in last Correction and Control passes through (T3), 220 knot of voltage to frequency control unit
Beam Correction and Control.Accordingly, output frequency is gradually adapted to rated frequency by voltage to frequency control unit 220.That is, by through overfrequency
244 ω of first-order lag element, to feedback control section 221 by output frequency gradually at leisure Correction and Control to rated frequency.
In fig. 8, it as an example of Correction and Control, the case where illustrating to be modified with 4 stages, but is not limited to
Such case, such as Correction and Control can also be implemented by more stages.
[Voltage droop control process S30]
Next, account for voltage droop control process S30.As described above, concurrently real with frequency droop control process S20
Apply voltage droop control process S30.If input load 130 simultaneously exports AC power, as shown in (b) of Fig. 7, Fig. 9, electric power change
The implementation of changing device 200 makes the droop control that output voltage is reduced from rated voltage.
Specifically, droop control portion 230 exports the contribution nothing of AC power based on output voltage and output current
Work(power (Qv), and based on the sagging rate of voltage as defined in the decrease amount av by per unit reactive power and contribution reactive power
(Qv), export makes the voltage sag of chain (- v) that output voltage is reduced from rated voltage.
For example, output voltage and current detecting part 215 that electric power operational part 231 is detected based on voltage detection department 214
The output current detected exports the contribution reactive power (Qv) of AC power.Droop control portion 230 reads data store
The sagging rate of voltage stored in 242, to by the derived contribution reactive power (Qv) of electric power operational part 231 and from data store
The 242 sagging rates of voltage read are multiplied to export voltage sag of chain (- v).It droop control portion 230 will so derived voltage
Sag of chain (- v) is output to voltage to frequency control unit 220.
Correction and Control portion 240 exports the rated voltage as voltage-target to voltage to frequency control unit 220.
Voltage to frequency control unit 220 adds the voltage sag of chain (- v) inputted from droop control portion 230 from Correction and Control
The obtained value of rated voltage that portion 240 inputs is input to feedback control section 221 as voltage instruction value.Feedback control section
221 implement the droop control for making voltage from specified reduction voltage sag of chain (- v) based on the voltage instruction value inputted.
As shown in figure 9, voltage to frequency control unit 220 makes output voltage reduce during the controlling cycle Δ t of inverter
Voltage sag of chain (- v).
[Voltage Correction and Control process S35]
Next, account for voltage Correction and Control process S35.As described above, concurrently real with frequency droop control process S30
Apply voltage Correction and Control process S35.After implementing droop control, power-converting device 200 is implemented at the time of Fig. 9 T2 will be electric
Pressure is gradually adapted to the Correction and Control of rated voltage.Specifically, Correction and Control portion 240 will be defeated by voltage sag of chain (- v) conduct
Go out the voltage correction value (+v) that voltage is adapted to rated voltage, based on for be based on voltage correction value (+v) by output voltage by
Gradually be adapted to the output voltage during rated voltage carry out as defined in gradually (+Δ v) sets voltage-target to correction value.
For example, command value correction portion 243 is stored to the contribution reactive power of 241 monitoring of output condition monitoring portion and from data
The sagging rate of voltage that portion 242 is read is multiplied to export voltage correction value (+v), and voltage correction value (+v) is input to voltage
244 ω of first-order lag element.Voltage first-order lag element 244v is gradually corrected based on the voltage correction value inputted, output voltage
It is worth (+Δ v).By the gradual correction value of voltage exported from voltage first-order lag element 244v, (+Δ v) adds command value correction portion 243
On the obtained value of rated voltage that is read from data store 242 be set as regulation output voltage be gradually adapted to specified electricity
The voltage-target of output voltage during pressure.Here the voltage-target set is output to by command value correction portion 243
Voltage to frequency control unit 220.
Voltage to frequency control unit 220 is using the voltage-target inputted from command value correction portion 243 as voltage instruction value
Implement the Correction and Control of output voltage.At this point, as shown in (c) of Fig. 7, Fig. 9, output voltage is from starting Correction and Control initial
The controlling cycle Δ t of inverter increase Δ ω.
In the controlling cycle Δ T of next PLC, (+2 Δ v) are as gradual for voltage first-order lag element 244v outputs
Correction value.Voltage to frequency control unit 220 further implements the Correction and Control of the voltage of the parts Δ v based on this.By repeatedly this
Correction and Control, as shown in (d) of Fig. 7, Fig. 9, Correction and Control that feedback control section 221 measures output voltage implementation+ω.If last
Correction and Control in the controlling cycle Δ T of PLC pass through (T3), then voltage to frequency control unit 220 terminates Correction and Control.Accordingly,
Output voltage is gradually adapted to rated voltage by voltage to frequency control unit 220.That is, by through overvoltage first-order lag element
244v, to which feedback control section 221 is gradually by output voltage Correction and Control to rated voltage.
In fig.9, it as an example of Correction and Control, the case where illustrating to be modified with 4 stages, but is not limited to
Such case, such as Correction and Control can also be implemented by more stages.
By these processes S10~S35, power-converting device 200 implement the output frequency for the AC power to be exported with
And the control of output voltage.
In the present embodiment, as described above, being implemented by different mechanisms (droop control portion 230, Correction and Control portion 240)
Droop control and Correction and Control.
Controlling cycle Δ Ts of the controlling cycle Δ t of inverter in most cases than PLC is short enough, but such as these weeks
Phase can also be roughly equal.
According to the present embodiment, voltage to frequency control unit 220 outputs AC power with rated frequency and rated voltage
Afterwards, by droop control portion 230 derived from frequency droop amount obtained plus the rated frequency stored in data store 242
To value feedback control section 221 is input to as frequency instruction value.In addition, voltage to frequency control unit 220 is by droop control portion
In 230 derived from voltage sag of chain plus value obtained from the rated voltage stored in data store 242 as voltage
Command value and be input to feedback control section 221.Feedback control section 221 is based on the frequency instruction value and voltage instruction value inputted
To implement droop control.Moreover, the frequency that voltage to frequency control unit 220 sets the command value correction portion 243 in Correction and Control portion 240
Rate desired value and voltage-target are input to feedback control section 221, feedback control as frequency instruction value and voltage instruction value
Output frequency and output voltage are gradually repaiied based on the frequency instruction value and voltage instruction value inputted, implementation in portion 221 processed
Just arrive the Correction and Control of rated frequency and rated voltage.
Hereby it is possible to the output frequency and output voltage that are reduced by droop control are adapted to it is specified, so
The influence of droop control can be reduced.
In addition, according to the present embodiment, when implementing the Correction and Control of frequency, 244 ω of frequency first-order lag element starts
After Correction and Control (T2), make the gradual correction value of frequency gradually increase+Δ ω by the controlling cycle Δ T of each PLC.Accordingly, due to
Command value correction portion 243 is set as that frequency targets value is made to gradually increase, thus feedback control section 221 can make frequency targets value
Output frequency is gradually adapted to rated frequency for frequency instruction value.In addition, hereby it is possible to before and after Correction and Control, incite somebody to action
Contribution active power is maintained almost equal.
In addition, according to the present embodiment, when implementing the Correction and Control of voltage, voltage first-order lag element 244v is starting
After Correction and Control (T2), make the gradual correction value of voltage gradually increase+Δ v by the controlling cycle Δ T of each PLC.Accordingly, due to referring to
Enable value correction portion 243 be set as that voltage-target is made to gradually increase, thus feedback control section 221 can using voltage-target as
Voltage instruction value and output frequency is gradually adapted to rated frequency.In addition, hereby it is possible to before and after Correction and Control, by tribute
It offers reactive power and is maintained almost equal.
In addition, according to the present embodiment, feedback control section 221 becomes the output that can monitor that voltage detection department 214 detects
The output current that voltage and current detecting part 215 detect.Accordingly, feedback control section 221 can be to output voltage and output
Electric current carries out feedback control.In addition hereby it is possible to steadily export the contribution active power and the idle work(of contribution of AC power
Rate.In addition, hereby it is possible to AC power is stably supplied to load 130.
Here, for the present inventor discussion power-converting device and present embodiment involved by power-converting device
200 difference is discussed.Figure 38 is the control for showing frequency and voltage in the power-converting device of the present inventor's discussion
The figure of involved sequence diagram.Figure 39 is to show the output frequency in the power-converting device of the present inventor's discussion and output electricity
The figure of the characteristic of pressure.It is shown in FIG. 38 the case where not implementing Correction and Control after implementing droop control.Because not implementing to repair
Positive control, so as shown in figure 38, output frequency is kept to reduce the state supply of frequency droop amount (- ω 1) from rated frequency
AC power.In addition, the state that output voltage has reduced voltage sag of chain (- v1) from rated voltage is kept to supply AC power.
Thus, for example, in the case where the alternating current line of force is connected to system, output frequency and output power such as Figure 39's
(a) it is changed centered on specified shown in, but in the case of no connection system, output frequency and output voltage are such as
Continue from the specified shape for reducing frequency droop amount (such as-ω 1) and voltage sag of chain (such as-v1) shown in (b) of Figure 39
State.
(embodiment 2)
Next, illustrating embodiment 2.In embodiment 2, illustrate by multiple power-converting devices 200 (PCS1,
PCS2) to 130 output AC power of load the case where.
Figure 10 is the figure of an example for showing the system involved by present embodiment.Power-converting device 200 (PCS1) is straight
Stream side is connected to DC power supply 121, and the alternating current line of force 120 is connected in exchange side.Power-converting device 200 (PCS1) will be from straight
The direct current power that galvanic electricity source 121 inputs is transformed to AC power and is output to the alternating current line of force 120.Power-converting device 200
(PCS2) it is connected to DC power supply 122 in DC side, the alternating current line of force 120 is connected in exchange side.Power-converting device 200
(PCS2) direct current power inputted from DC power supply 122 is transformed to AC power and is output to the alternating current line of force 120.
[The Kong Zhifangfa ] of frequency and voltage;
Here, the control method of frequency and voltage in present embodiment is illustrated.Figure 11 is to show this implementation
The figure of FREQUENCY CONTROL and the involved flow chart of voltage control in mode.Figure 12 is the frequency control shown in present embodiment
The figure of the involved droop characteristic of system.Figure 13 is the figure for showing the involved droop characteristic of voltage control in present embodiment.
Figure 14 is the figure of the sequence diagram involved by the FREQUENCY CONTROL that shows in present embodiment.Figure 15 is the electricity shown in present embodiment
The figure of sequence diagram involved by voltage-controlled system.
As shown in figure 11, each power-converting device 200 (PCS1, PCS2) is by implementing rated output process S110, frequency
Rate droop control process S120, frequency Correction and Control process S125, voltage droop control process S130, voltage Correction and Control process
The each process of S135, to control the output frequency and output voltage of AC power.In addition, above-mentioned each process S110~S135 exists
Concurrently implement in each power-converting device 200.Therefore, when illustrating each process, each power-converting device is described collectively
Action in 200 (PCS1, PCS2).
In addition, hereinafter, for convenience of description, the controlling cycle of power converter portion (inverter) 210 being set as Δ t, will be repaiied
The controlling cycle Δ T in positive control portion (PLC) is set as 4 Δ t.In addition, 244 ω of frequency first-order lag element and voltage single order is stagnant
The time constant of element 244v is set as 4 Δ T afterwards.In addition, with divide into inverter control timing and PLC control timing in electricity
Difference illustrates between force conversion system 200 (PCS1, PCS2).
[Rated output process S110]
First, illustrate rated output process S110.Before input load 130, power-converting device 200 (PCS1,
PCS2 contribution active power and contribution reactive power) is all " 0 ".At this point, output frequency and output voltage are with specified
The state of balance.
If the moment T1 input load 130, each power-converting device 200 (PCS1, PCS2) almost simultaneously export to
The AC power of 130 supply of load.The AC power of each power-converting device 200 (PCS1, PCS2) output is according to respective
Output impedance is distributed.
The power converter portion (inverter) 210 of each power-converting device 200 (PCS1, PCS2) is in its controlling cycle Δ t
During make current direction load and maintain alternating voltage.Then, as shown in figure 14, power-converting device 200 (PCS1) is defeated
Go out P ω 1 as contribution active power.In addition, as shown in figure 15, power-converting device 200 (PCS1) exports Qv1 as contribution nothing
Work(power.
As shown in figure 14, power-converting device 200 (PCS2) output P ω 2 are as contribution active power.In addition, such as Figure 15
Shown, power-converting device 200 (PCS2) exports Qv2 as contribution reactive power.
Therefore, being supplied to the active power of load 130 becomes P ω 1+P ω 2, and being supplied to the reactive power of load 130 becomes
Qv1+Qv2。
[Frequency droop controls process S120]
If exporting AC power, the droop control portion 230 of each power-converting device 200 (PCS1, PCS2) is to frequency
And voltage implements droop control.After implementing droop control, Correction and Control is implemented to frequency and voltage.In droop control
And in Correction and Control, control of the parallel practice to frequency and voltage, but here for convenience of description, it is illustrating to frequency
After the droop control and Correction and Control of rate, illustrate the droop control and Correction and Control to voltage.
Here, illustrate frequency droop control process S120.If input load 130 simultaneously exports AC power, such as Figure 12
(a), shown in Figure 14, power-converting device 200 (PCS1, PCS2) implementation makes the sagging control that output frequency is reduced from rated frequency
System.Wherein, as shown in figure 14, power-converting device 200 (PCS1) is compared to power-converting device 200 (PCS2), inverter
Control timing is more early, so power-converting device 200 (PCS1) first starts droop control.
It is led specifically, the droop control portion 230 of power-converting device 200 (PCS1) is based on contribution active power (P ω 1)
Go out frequency droop amount (- ω 1).The feedback control section 221 of voltage to frequency control unit 220 is by frequency droop amount (- ω 1) plus specified
The obtained value of frequency is implemented to make output frequency from the sagging of specified reduction frequency droop amount (- ω 1) as frequency instruction value
Control.Accordingly, as shown in figure 14, voltage to frequency control unit 220 makes output frequency drop during the controlling cycle Δ t of inverter
Low frequency sag of chain (- ω 1).As shown in figure 14, under feedback control section 221 is implemented during the controlling cycle Δ t of inverter
It hangs down and controls.
As shown in figure 14, power-converting device 200 (PCS2) starts in the droop control of power-converting device 200 (PCS1)
Start droop control afterwards and before the end of droop control.
It is led specifically, the droop control portion 230 of power-converting device 200 (PCS2) is based on contribution active power (P ω 2)
Go out frequency droop amount (- ω 2).The feedback control section 221 of voltage to frequency control unit 220 is by frequency droop amount (- ω 2) plus specified
The obtained value of frequency is implemented to make output frequency from the sagging of specified reduction frequency droop amount (- ω 2) as frequency instruction value
Control.Accordingly, voltage to frequency control unit 220 makes output frequency reduce frequency droop during the controlling cycle Δ t of inverter
It measures (- ω 2).
Frequency droop amount in power-converting device 200 (PCS1, PCS2) each power-converting device 200 (PCS1,
PCS2 almost equal in).But as described above, because implement droop control timing power-converting device 200 (PCS1,
PCS2 different between), thus and the reflection of the contribution corresponding frequency droop amount of active power in generate deviation.Partially due to this
Difference, electric current are flowed through in the form of flowing between power-converting device 200 (PCS1, PCS2).But in the control of next inverter
During period Δ t, the convergence of this deviation, as shown in (a) of Figure 12, Figure 14, power-converting device 200 (PCS1, PCS2)
It is balanced each other with identical frequency droop amount (- ω 1=- ω 2) corresponding with respective contribution active power.
[Frequency Correction and Control process S125]
Next, illustrating frequency Correction and Control process S125.After implementing droop control, power-converting device 200
(PCS1) implement the Correction and Control that frequency is gradually adapted to rated frequency T2 at the time of Figure 14.Wherein, as shown in figure 14,
Power-converting device 200 (PCS1) is compared to power-converting device 200 (PCS2), and the control timing of inverter is more early, so electric
Force conversion system 200 (PCS1) first starts the Correction and Control of output frequency.
For example, the command value correction portion 243 of power-converting device 200 (PCS1) is to 241 monitoring of output condition monitoring portion
Contribution active power is multiplied to export frequency correction value (+ω with the frequency droop rate read from data store 242
1) frequency correction value (+ω 1), is input to 244 ω of frequency first-order lag element.244 ω of frequency first-order lag element is based on institute
The frequency correction value of input, the gradual correction value of output frequency (+Δ ω 1).Command value correction portion 243 will be wanted from frequency first-order lag
It is obtained that the gradual correction value of frequency (+Δ ω 1) of element 244 ω outputs adds the rated frequency read from data store 242
Value is set as the frequency targets value of the output frequency during output frequency is gradually adapted to rated frequency by regulation.Command value
Here set frequency targets value is output to voltage to frequency control unit 220 by correction portion 243.Voltage to frequency control unit 220 will
The frequency targets value inputted from command value correction portion 243 implements the Correction and Control of output frequency as frequency instruction value.
At this point, the output frequency of power-converting device 200 (PCS1) by Correction and Control to output frequency increase.Cause
This, as shown in (b) of Figure 12, the active power of power-converting device 200 (PCS2) contribution is reduced, power-converting device 200
(PCS1) active power contributed increases.
Then, after the Correction and Control in power-converting device 200 (PCS1) starts, when becoming moment T3, power converter
Device 200 (PCS2) also begins to the Correction and Control of output frequency.
For example, the command value correction portion 243 of power-converting device 200 (PCS2) is to 241 monitoring of output condition monitoring portion
Contribution active power is multiplied to export frequency correction value (+ω with the frequency droop rate read from data store 242
2) frequency correction value (+ω 2), is input to 244 ω of frequency first-order lag element.244 ω of frequency first-order lag element is based on institute
The frequency correction value of input, the gradual correction value of output frequency (+Δ ω 2).Command value correction portion 243 will be wanted from frequency first-order lag
It is obtained that the gradual correction value of frequency (+Δ ω 2) of element 244 ω outputs adds the rated frequency read from data store 242
Value is set as the frequency targets value of the output frequency during output frequency is gradually adapted to rated frequency by regulation.Command value
Here set frequency targets value is output to voltage to frequency control unit 220 by correction portion 243.As shown in (c) of Figure 12, frequency
The frequency targets value inputted from command value correction portion 243 is implemented output frequency by voltage control division 220 as frequency instruction value
Correction and Control.
At this point, the output frequency of power-converting device 200 (PCS2) by Correction and Control to output frequency increase.Cause
This, as shown in (c) of Figure 12, the active power of power-converting device 200 (PCS1) contribution is reduced, power-converting device 200
(PCS2) active power contributed increases.
Moreover, during power-converting device 200 (PCS2) implements Correction and Control, as shown in figure 14, power converter dress
Set next Correction and Control that 200 (PCS1) start gradual correction value (+2 Δ ω 1) part.Moreover, power-converting device 200
(PCS2) during power-converting device 200 (PCS2) implements the Correction and Control of gradual correction value (+2 Δ ω 1) part, start
The Correction and Control of gradual part correction value (+2 Δ ω 21).By such action repeatedly, to each power-converting device 200
Output frequency is such as adapted to rated frequency by (PCS1, PCS2) shown in (d) of Figure 12, Figure 14.
[Voltage droop control process S130]
Next, account for voltage droop control process S130.If input load 130 simultaneously exports AC power, such as Figure 13
(a), shown in Figure 15, power-converting device 200 (PCS1, PCS2) implementation makes the sagging control that output voltage is reduced from rated voltage
System.Wherein, as shown in figure 15, power-converting device 200 (PCS1) is compared to power-converting device 200 (PCS2), inverter
Control timing is more early, so power-converting device 200 (PCS1) first starts droop control.
It is led specifically, the droop control portion 230 of power-converting device 200 (PCS1) is based on contribution reactive power (Qv1)
Go out voltage sag of chain (- v1).Voltage sag of chain (- v1) is added specified electricity by the feedback control section 221 of voltage to frequency control unit 220
Obtained value is pressed as voltage instruction value to implement the sagging control for making output voltage from specified reduction voltage sag of chain (- v1)
System.Accordingly, as shown in figure 15, voltage to frequency control unit 220 makes output voltage reduce during the controlling cycle Δ t of inverter
Voltage sag of chain (- v1).As shown in figure 15, feedback control section 221 implements sagging control during the controlling cycle Δ t of inverter
System.
As shown in figure 15, power-converting device 200 (PCS2) starts in the droop control of power-converting device 200 (PCS1)
Afterwards and droop control terminates preceding beginning droop control.
It is led specifically, the droop control portion 230 of power-converting device 200 (PCS2) is based on contribution reactive power (Qv2)
Go out voltage sag of chain (- v2).Voltage sag of chain (- v2) is added specified electricity by the feedback control section 221 of voltage to frequency control unit 220
Obtained value is pressed as voltage instruction value to implement the sagging control for making output voltage from specified reduction voltage sag of chain (- v2)
System.Accordingly, voltage to frequency control unit 220 makes output voltage drop low-voltage sag of chain during the controlling cycle Δ t of inverter
(-v2)。
Voltage sag of chain in power-converting device 200 (PCS1, PCS2) each power-converting device 200 (PCS1,
PCS2 almost equal in).But as described above, because implement droop control timing power-converting device 200 (PCS1,
PCS2 different between), thus and the reaction of the contribution corresponding voltage sag of chain of reactive power in generate deviation.Due to the deviation,
Electric current is flowed through in the form of flowing between power-converting device 200 (PCS1, PCS2).But in the control of next inverter week
During phase Δ t, the convergence of this deviation, as shown in (a) of Figure 13, Figure 15, power-converting device 200 (PCS1, PCS2) with
Identical voltage sag of chain (- v1=-v2) balance corresponding with respective contribution reactive power.
[Voltage Correction and Control process S135]
Next, account for voltage Correction and Control process S135.After implementing droop control, power-converting device 200
(PCS1) implement the Correction and Control that voltage is gradually adapted to rated voltage T2 at the time of Figure 15.Wherein, as shown in figure 15,
Power-converting device 200 (PCS1) is compared to power-converting device 200 (PCS2), and the control timing of inverter is more early, so electric
Force conversion system 200 (PCS1) first starts the Correction and Control of output voltage.
For example, the command value correction portion 243 of power-converting device 200 (PCS1) is to 241 monitoring of output condition monitoring portion
Contribution active power is multiplied to export voltage correction value (+v1) with the sagging rate of voltage read from data store 242,
Voltage correction value (+v1) is input to voltage first-order lag element 244v.Voltage first-order lag element 244v is based on being inputted
Voltage correction value, the gradual correction value of output voltage (+Δ v1).Command value correction portion 243 will be from voltage first-order lag element 244v
The gradual correction value of voltage (+Δ v1) of output adds the obtained value of rated voltage read from data store 242 and is set as
Regulation output voltage is gradually adapted to rated voltage during output voltage voltage-target.Command value correction portion
Here set voltage-target is output to voltage to frequency control unit 220 by 243.Voltage to frequency control unit 220 will be from instruction
The voltage-target that value correction portion 243 inputs implements the Correction and Control of output voltage as voltage instruction value.
At this point, the output voltage of power-converting device 200 (PCS1) by Correction and Control to output voltage increase.Cause
This, as shown in (b) of Figure 13, the reactive power of power-converting device 200 (PCS2) contribution is reduced, power-converting device 200
(PCS1) reactive power contributed increases.
Moreover, after the Correction and Control in power-converting device 200 (PCS1) starts, when becoming moment T3, power converter
Device 200 (PCS2) also begins to the Correction and Control of output voltage.
For example, the command value correction portion 243 of power-converting device 200 (PCS2) is to 241 monitoring of output condition monitoring portion
Contribution active power is multiplied to export voltage correction value (+v2) with the sagging rate of voltage read from data store 242,
Voltage correction value (+v2) is input to voltage first-order lag element 244v.Voltage first-order lag element 244v is based on being inputted
Voltage correction value, the gradual correction value of output voltage (+Δ v2).Command value correction portion 243 will be from voltage first-order lag element 244v
The gradual correction value of voltage (+Δ v2) of output adds the obtained value of rated voltage read from data store 242 and is set as
Regulation output voltage is gradually adapted to rated voltage during output voltage voltage-target.Command value correction portion
Here set voltage-target is output to voltage to frequency control unit 220 by 243.As shown in (c) of Figure 13, voltage to frequency control
Portion 220 processed is implemented to the amendment of output voltage by the voltage-target inputted from command value correction portion 243 as voltage instruction value
Control.
At this point, the output voltage of power-converting device 200 (PCS2) by Correction and Control to output voltage increase.Cause
This, as shown in (c) of Figure 13, the reactive power of power-converting device 200 (PCS1) contribution is reduced, power-converting device 200
(PCS2) reactive power contributed increases.
Moreover, during power-converting device 200 (PCS2) implements Correction and Control, as shown in figure 15, power converter dress
Set next Correction and Control that 200 (PCS1) start gradual correction value (+2 Δ v1) part.Moreover, power-converting device 200
(PCS2) during power-converting device 200 (PCS2) implements the Correction and Control of gradual correction value (+2 Δ v1) part, start
The Correction and Control of gradual part correction value (+2 Δ v21).By such action repeatedly, to each power-converting device 200
Output voltage is such as modified to rated voltage by (PCS1, PCS2) shown in (d) of Figure 13, Figure 15.
By these processes S110~S135, power-converting device 200 (PCS1, PCS2) implements the AC power to be exported
Output frequency and output voltage control.Here, it illustrates to keep two power-converting devices 200 (PCS1, PCS2) parallel
The case where operating, but not limited to this, for example, three or more power-converting devices 200 can be connected in parallel.
According to the present embodiment, in each of multiple power-converting devices 200 (PCS1, PCS2), gradually implement to repair
Positive control.Accordingly, even if each electric power can be made if output frequency and output voltage are adapted to specified by Correction and Control
The active power and reactive power of converting means 200 (PCS1, PCS2) contribution front and back are maintained almost equal modified.
In addition, according to the present embodiment, after having carried out droop control, implementing Correction and Control.Accordingly, make multiple electric power
Converting means 200 parallel operating in the case of, can make each power-converting device 200 liberally share contribution active power with
And contribution reactive power.Therefore, it is possible to effectively utilize the controlling of liberally load sharing, and frequency and voltage are tieed up
It is specified to hold.
In addition, because after having carried out droop control, implement Correction and Control, so need not be in order to inhibit from specified inclined
It moves and reduces sag of chain.Hereby it is possible to which the required control accuracy of sharing of load is not made to be filled with other power converters with reducing
Set the information that 200 (PCS1, PCS2) share contribution power.
Here, to the present inventor discussion power-converting device and present embodiment involved by power-converting device 200
Difference discussed.Figure 40 is the output frequency and output voltage shown in the power-converting device of the present inventor's discussion
The figure of droop characteristic.Figure 41 is shown involved by the control of frequency and voltage in the power-converting device of the present inventor's discussion
Sequence diagram figure.Here, it shows the case where not implementing Correction and Control after implementing droop control.
If implementing droop control, such as shown in (a) of Figure 40, the power-converting device (PCS1, PCS2) of both sides make it is defeated
Go out frequency from the sagging state balance of frequency droop amount (- ω 1) of rated frequency.In addition, shown in (b) of Figure 40, the electricity of both sides
Force conversion system (PCS1, PCS2) is in the state balance for making output voltage reduce from rated voltage voltage sag of chain (- v1).
Moreover, as shown in figure 41, the power-converting device (PCS1, PCS2) of both sides so that output frequency under rated frequency
The state of frequency droop amount of having hung down (- ω 1) supplies AC power.In addition, as shown in figure 41, the power-converting device of both sides
(PCS1, PCS2) is so that output voltage has reduced the state output AC power of voltage sag of chain (- v1) from rated voltage.
In this way, in the power-converting device of the present inventor's discussion, output frequency and output voltage cannot carry out
It is adapted in the state of droop control specified.Therefore, implement droop control while to inhibit sag of chain, then can make to share negative
Carrying required control accuracy reduces.In addition, it also occur that being difficult to shared with other power-converting devices 200 (PCS1, PCS2)
The information of contribution power.
(embodiment 3)
In the present embodiment, it is described as follows situation:When making multiple power-converting devices operate parallel, by each
The frequency correction value and voltage correction value of the shared parallel involved whole power-converting devices of operating of power-converting device, from
And implement Correction and Control while cooperation.
Figure 16 is the figure of an example for the structure for showing the power-converting device involved by present embodiment.
Figure 17 is the figure of an example for the structure for showing the command value correction portion in Correction and Control portion.Figure 18 is to show to correct control
The figure of an example of the structure in the Cooperation controlling portion in portion processed.
Power-converting device 300 has power converter portion 210, voltage detection department 214, current detecting part 215 and alternating current
Force control unit 350.
AC power control unit 350 has droop control portion 230, Correction and Control portion 340, voltage to frequency control unit 220.
As shown in figure 16, Correction and Control portion 340 has output condition monitoring portion 241, data store 242, command value are repaiied
Positive portion 343, Cooperation controlling portion 345, network interface portion 346.
Implement the data transmit-receive of other power-converting devices 300 involved with parallel operating in network interface portion 346.In detail
For, network interface portion 346 realize used in the communication with multiple power-converting devices 300 meet wanting for procotol
The required element of the general network communication such as communication arbitration of plain, each purpose.
Network interface portion 346 receives foreign frequency that participate in other power-converting devices 300 operated parallel, aftermentioned and repaiies
Positive value and external voltage correction value.Specifically, aftermentioned correction value entry control unit 361 is looked into via network interface portion 346
Ask other the whole power-converting devices 300 participated in and operated parallel.Other whole power-converting devices 300 send each electric power and become
The internal frequency correction value and builtin voltage correction value that changing device 300 is held are repaiied as foreign frequency correction value, external voltage
Positive value.Network interface portion 346 receives foreign frequency correction value and the outside of other the whole power-converting devices 300 sent
Voltage correction value.Network interface portion 346 is by the foreign frequency correction value of other power-converting devices 300 received and outside
Voltage correction value is sent to Cooperation controlling portion 345.In addition, network interface portion 346 is by the internal frequency correction value of itself and interior
Portion's voltage correction value is sent to other power-converting devices 300 as foreign frequency correction value, external voltage correction value.
Other power-converting devices 300 involved with parallel operating of Cooperation controlling portion 345 cooperate to implement Correction and Control.
As shown in figure 18, Cooperation controlling portion 345 has correction value entry control unit 361,362 ω of foreign frequency correction value storage part, outer
363 ω of portion's frequency correction value comparing section, external voltage correction value storage part 362v, external voltage correction value comparing section 363v.
Correction value entry control unit 361 accepts the outside of other power-converting devices 300 sent from network interface portion 346
The input of frequency correction value and external voltage correction value.Correction value entry control unit 361 is by the foreign frequency correction value of input
And the foreign frequency correction value in external voltage correction value is output to 362 ω of foreign frequency correction value storage part, by external electrical
Pressure correction value is output to external voltage correction value storage part 362v.The 362 ω storages of foreign frequency correction value storage part are inputted
Foreign frequency correction value.External voltage correction value storage part 362v stores inputted external voltage correction value.
Correction value entry control unit 361,362 ω of foreign frequency correction value storage part, external voltage correction value storage part
362v implements these actions for other whole power-converting devices 300 that participation operates parallel.
363 ω of foreign frequency correction value comparing section compares the whole stored in 362 ω of foreign frequency correction value storage part
Foreign frequency correction value is output to command value amendment using maximum foreign frequency correction value as maximum foreign frequency correction value
Portion 343.Specifically, 363 ω of foreign frequency correction value comparing section readings are stored in 362 ω of foreign frequency correction value storage part
Whole foreign frequency correction values, more each foreign frequency correction value, using maximum foreign frequency correction value as maximum outer
Portion's frequency correction value is output to command value correction portion 343.
It is outer that external voltage correction value comparing section 363v compares the whole stored in external voltage correction value storage part 362v
Portion's voltage correction value is output to command value correction portion using maximum external voltage correction value as maximum external voltage correction value
343.Specifically, it is stored in external voltage correction value comparing section 363v reading external voltage correction value storage parts 362v complete
Portion's external voltage correction value, more each external voltage correction value, using maximum external voltage correction value as maximum external electrical
It presses correction value and is output to command value correction portion 343.
Command value correction portion 343 provides the output frequency in Correction and Control and the output voltage.Such as Figure 17 institutes
Show, command value correction portion 343 has 347 ω of frequency correction value comparing section, voltage correction value comparing section 347v, frequency first-order lag
244 ω of element, voltage first-order lag element 244v.
Command value correction portion 343 is in the contribution active power and data store 242 of 241 monitoring of output condition monitoring portion
The frequency droop rate of storage is multiplied to export internal frequency correction value.Internal frequency correction value is input into derived from institute
347 ω of frequency correction value comparing section.
347 ω of frequency correction value comparing section accepts the external frequency of the maximum exported from 363 ω of foreign frequency correction value comparing section
The input of rate correction value.347 ω of frequency correction value comparing section compares internal frequency correction value and maximum foreign frequency correction value, leads
Go out the larger value of either one or two of internal frequency correction value and maximum foreign frequency correction value as frequency correction value.Frequency amendment
Frequency correction value is input to 244 ω of frequency first-order lag element by value.Command value correction portion 343 will be from frequency first-order lag element
The gradual correction value of frequency of 244 ω outputs is set as regulation plus the obtained value of rated frequency and is gradually adapted to output frequency
The frequency targets value of output frequency during rated frequency.
In this way, in the present embodiment, the frequency correction value in whole power-converting devices 300 that participation is operated parallel
In maximum frequency correction value be utilized as frequency correction value.That is, in whole power-converting devices 300, make in Correction and Control
With identical frequency correction value, so being cooperated to implement Correction and Control.
Command value correction portion 343 will export in the contribution reactive power and data store 242 that condition monitoring portion 241 monitors
The sagging rate of voltage of storage is multiplied to export builtin voltage correction value.Builtin voltage correction value is input into electricity derived from institute
Press correction value comparing section 347v.
Voltage correction value comparing section 347v accepts the maximum external voltage exported from external voltage correction value comparing section 363v
The input of correction value.Voltage correction value comparing section 347v compares builtin voltage correction value and maximum external voltage correction value, export
The larger value of either one or two of builtin voltage correction value and maximum external voltage correction value is as voltage correction value.Voltage correction value
Voltage correction value is input to voltage first-order lag element 244v.Command value correction portion 343 will be from voltage first-order lag element
The gradual correction value of voltage of 244v outputs is set as regulation plus the obtained value of rated voltage and is gradually adapted to output voltage
The voltage-target of output voltage during rated voltage.
In this way, in the present embodiment, the voltage correction value in whole power-converting devices 300 that participation is operated parallel
In maximum voltage correction value be utilized as voltage correction value.That is, in whole power-converting devices 300, in Correction and Control
Using identical voltage correction value, so being cooperated to implement Correction and Control.
Each portion and each function for constituting Correction and Control portion 340 can be constituted using hardware or software.It is repaiied in composition
In the case of each portion in positive control portion 340 and each function software realization, for example, Correction and Control portion 340 includes (not shown)
CPU (or application specific processor), CPU execute the program that is stored in memory (not shown) etc. to realize each portion and each work(
Energy.
The programmable logic controller (PLC) (PLC) for being equipped on power-converting device 300 can be used for example in Correction and Control portion 340
To realize.
[The Kong Zhifangfa ] of frequency and voltage in the case that time constant is big;
Here, to having used the frequency of the power-converting device 300 involved by present embodiment and the controlling party of voltage
Method illustrates.Here, the case where participating in parallel operating for two power-converting devices 300 (PCS1, PCS2) illustrates.
In addition, below for convenience of description, the controlling cycle of power converter portion (inverter) 210 being set as Δ t, will be corrected
The controlling cycle Δ T of control unit (PLC) is set as 4 Δ t.In addition, by 244 ω of frequency first-order lag element and voltage first-order lag
The time constant of element 244v is set as 4 Δ T.In addition, in two power-converting devices 300 (PCS1, PCS2), if inverter
Controlling cycle Δ t is identical, and the control timing of inverter and the control of PLC timing are different.
First, illustrate that the time constant of 244 ω of frequency first-order lag element and voltage first-order lag element 244v is big
Situation.Figure 19 is the figure for showing FREQUENCY CONTROL and the involved flow chart of voltage control in present embodiment.Figure 20 is to show
Go out time constant it is big in the case of FREQUENCY CONTROL involved by droop characteristic figure.Figure 21 is the situation for showing that time constant is big
Under the involved droop characteristic of voltage control figure.Figure 22 is involved by the FREQUENCY CONTROL that shows in the case that time constant is big
Sequence diagram figure.Figure 23 is the figure for showing the involved sequence diagram of voltage control in the case that time constant is big.
As shown in figure 19, power-converting device 300 is by implementing rated output process S210, frequency droop control process
The each process of S220, frequency Correction and Control process S225, voltage droop control process S230, voltage Correction and Control process S235,
To control the output frequency and output voltage of AC power.In addition, controlling work for rated output process S210, frequency droop
Sequence S220, voltage droop control process S230 because implement respectively in the above embodiment 2 rated output process S110,
Frequency droop controls process S120, the identical controls of voltage droop control process S130, so omitting the description here.
[Frequency Correction and Control process S225]
Illustrate frequency Correction and Control process S225.347 ω of frequency correction value comparing section of power-converting device 300 (PCS1)
Compare the foreign frequency correction value exported from 363 ω of foreign frequency correction value comparing section in Cooperation controlling portion 345 and by command value
Internal frequency correction value derived from correction portion 343 exports any larger value as frequency correction value.Frequency correction value comparing section
Derived frequency correction value is input to 244 ω of frequency first-order lag element by 347 ω.244 ω of frequency first-order lag element is based on
The frequency correction value inputted carrys out the gradual correction value of output frequency.Feedback control section 221 is implemented based on the gradual correction value of frequency
The Correction and Control of frequency.In this way, the internal frequency that the whole power-converting devices 300 (PCS1, PCS2) operated parallel will be participated in
Maximum value in correction value implements Correction and Control as frequency correction value.
In addition, power-converting device 300 (PCS2) also exports and the identical frequency amendment of power-converting device 300 (PCS1)
The frequency Correction and Control based on the frequency correction value is implemented in value, cooperation.
Here, in the case where time constant is big, the gradual correction value of frequency of frequency first-order lag element 244 ω outputs is simultaneously
It is not immediate response to frequency targets value (frequency instruction value).Therefore, the power-converting device caused by correction value will not occur
Contribution active power between 300 (PCS1) and power-converting device 300 (PCS2) it is big unbalanced.Such as Figure 12, Figure 14, figure
20, shown in Figure 22, in the frequency Correction and Control process S125 in frequency Correction and Control and the above embodiment 2 in this case
Frequency Correction and Control is almost without difference.
[Voltage Correction and Control process S235]
Account for voltage Correction and Control process S235.The voltage correction value comparing section 347v of power-converting device 300 (PCS1)
Compare the external voltage correction value exported from the external voltage correction value comparing section 363v in Cooperation controlling portion 345 and is repaiied by command value
Builtin voltage correction value derived from positive portion 343 exports any larger value as voltage correction value.Voltage correction value comparing section
Derived voltage correction value is input to voltage first-order lag element 244v by 347v.It is defeated that voltage first-order lag element 244v is based on institute
The voltage correction value entered carrys out the gradual correction value of output voltage.Feedback control section 221 implements voltage based on the gradual correction value of voltage
Correction and Control.In this way, the builtin voltage amendment that the whole power-converting devices 300 (PCS1, PCS2) operated parallel will be participated in
Maximum value in value implements Correction and Control as voltage correction value.
In addition, power-converting device 300 (PCS2) also exports and the identical voltage amendment of power-converting device 300 (PCS1)
The voltage Correction and Control based on the voltage correction value is implemented in value, cooperation.
Here, in the case where time constant is big, the gradual correction value of voltage of voltage first-order lag element 244v outputs is simultaneously
It is not immediate response to voltage-target (voltage instruction value).Therefore, the power-converting device caused by correction value will not occur
Contribution reactive power between 300 (PCS1) and power-converting device 300 (PCS2) it is big unbalanced.Such as Figure 13, Figure 15, figure
21, shown in Figure 23, in the voltage Correction and Control process S135 in voltage Correction and Control and the above embodiment 2 in this case
Voltage Correction and Control is almost without difference.
[The Kong Zhifangfa ] of frequency and voltage in the case that time constant is small;
Next, illustrating that the time constant of 244 ω of frequency first-order lag element and voltage first-order lag element 244v are small
The case where.Figure 24 is the figure of the droop characteristic involved by the FREQUENCY CONTROL that shows in the case that time constant is small.Figure 25 is to show
The figure of the involved droop characteristic of voltage control in the case that time constant is small.Figure 26 is in the case of showing that time constant is small
FREQUENCY CONTROL involved by sequence diagram figure.Figure 27 be show voltage control in the case that time constant is small it is involved when
The figure of sequence figure.
In addition, hereinafter, the example of the situation small as time constant, by 244 ω of frequency first-order lag element and voltage
The time constant of first-order lag element 244v is set as 2 Δ T.
[Frequency Correction and Control process S225]
Before implementing frequency Correction and Control, as shown in (a) of Figure 24, becomes frequency droop amount (contribution active power) and exist
The state balanced between power-converting device 300 (PCS1, PCS2).
In the case where time constant is small, the gradual correction value of frequency of frequency first-order lag element 244 ω outputs is anti-immediately
Frequency targets value (frequency instruction value) should be arrived.Therefore, if power-converting device 300 (PCS1) implements frequency amendment control at moment T2
System, then as shown in (b) of Figure 24, Figure 26, the contribution active power of power-converting device 300 (PCS1) is temporary and sharp increases
Add, the contribution active power of power-converting device 300 (PCS2) is temporary and sharp reduces, and generates the unevenness of contribution active power
Weighing apparatus state.
Power-converting device 300 (PCS2) implements frequency Correction and Control at moment T3.Power-converting device 300 (PCS2) is no
The calculated frequency correction value using the contribution active power according to the drastically reduction of itself, but become using as to electric power
The frequency correction value of the frequency correction value and power-converting device 300 (PCS1) of changing device 300 (PCS1) itself carries out size ratio
Compared with result power-converting device 300 (PCS1) frequency correction value.Then, as shown in (c) of Figure 24, Figure 26, this tribute
The unbalanced of active power is offered to be eliminated.By implementing these frequency Correction and Controls repeatedly, to (d), the Tu26Suo such as Figure 24
Show, output frequency is adapted to specified by power-converting device 300 (PCS1, PCS2).At this point, in power-converting device 300
In (PCS1, PCS2), the contribution active power before and after frequency Correction and Control is maintained almost equal.
[Voltage Correction and Control process S235]
Before implementing voltage Correction and Control, as shown in (a) of Figure 25, becomes voltage sag of chain (contribution reactive power) and exist
The state balanced between power-converting device 300 (PCS1, PCS2).
In the case where time constant is small, the gradual correction value immediate response of voltage of voltage first-order lag element 244v outputs
To voltage-target (voltage instruction value).Therefore, if power-converting device 300 (PCS1) implements voltage amendment control at moment T2
System, then as shown in (b) of Figure 25, Figure 27, the contribution reactive power of power-converting device 300 (PCS1) is temporary and sharp increases
Add, the contribution reactive power of power-converting device 300 (PCS2) is temporary and sharp reduces, and generates the unevenness of contribution reactive power
Weighing apparatus state.
Power-converting device 300 (PCS2) implements voltage Correction and Control at moment T3.Power-converting device 300 (PCS2) is no
The calculated voltage correction value using the contribution reactive power according to the drastically reduction of itself, and using as to power converter
The voltage correction value of the voltage correction value and power-converting device 300 (PCS1) of device 300 (PCS1) itself carries out size comparison
Result power-converting device 300 (PCS1) voltage correction value.Then, as shown in (c) of Figure 25, Figure 27, this contribution
The unbalanced of reactive power is eliminated.By implementing these voltage Correction and Controls repeatedly, to as shown in (d) of Figure 25, Figure 27,
Output voltage is adapted to specified by power-converting device 300 (PCS1, PCS2).At this point, power-converting device 300 (PCS1,
PCS2 in), the contribution reactive power before and after frequency Correction and Control remains almost equal.
According to the present embodiment, the inside of the whole power-converting devices 300 (PCS1, PCS2) operated parallel is participated in export
Maximum value in frequency correction value is as frequency correction value.Accordingly, whole power-converting devices 300 (PCS1, PCS2) can
The maximum value is exported as common frequency correction value, is cooperated to implement frequency Correction and Control.
In addition, although the time constant of 244 ω of frequency first-order lag element is small, 244 ω of frequency first-order lag element is exported
The gradual correction value immediate response of frequency to frequency targets value (frequency instruction value), but according to the present embodiment, due to electric power
The frequency Correction and Control of converting means 300 (PCS1) and the contribution active power that generates it is unbalanced, pass through power-converting device
The frequency Correction and Control of 300 (PCS2) and be eliminated.Accordingly, in power-converting device 300 (PCS1, PCS2), frequency is repaiied
Contribution active power before and after positive control remains almost equal.
In addition, according to the present embodiment, the whole power-converting devices 300 (PCS1, PCS2) operated parallel are participated in export
Builtin voltage correction value in maximum value as voltage correction value.Accordingly, whole power-converting devices 300 (PCS1,
PCS2 the maximum value) can be exported as common voltage correction value, cooperated to implement voltage Correction and Control.
In addition, although the time constant of voltage first-order lag element 244v is small, the 244v outputs of voltage first-order lag element
The gradual correction value immediate response of voltage is to voltage-target (voltage instruction value), but according to the present embodiment, since electric power becomes
The voltage Correction and Control of changing device 300 (PCS1) and the contribution reactive power that generates it is unbalanced, pass through power-converting device 300
(PCS2) voltage Correction and Control and be eliminated.Accordingly, in power-converting device 300 (PCS1, PCS2), voltage amendment control
The front and back contribution reactive power of system remains almost equal.
Here, for the present inventor discussion power-converting device and present embodiment involved by power-converting device
300 difference is discussed.Figure 42 is the droop characteristic for showing the output frequency in the power-converting device of the present inventor's discussion
Figure.Figure 43 is the figure for the droop characteristic for showing the output voltage in the power-converting device of the present inventor's discussion.Figure 44 is to show
Go out the figure of the sequence diagram involved by the FREQUENCY CONTROL in the power-converting device of the present inventor's discussion.Figure 45 is to show the present inventor
The figure of the involved sequence diagram of voltage control in the power-converting device of discussion.
In the power-converting device (for example, power-converting device 200 etc. involved by embodiment 2) of the present inventor's discussion
In, for example, participating in the power-converting device that operates parallel is not based on common frequency correction value to implement frequency Correction and Control,
And individual frequency correction value derived from institute is used in each power-converting device to implement frequency Correction and Control.
Therefore, inferior in the small situation of the time constant of frequency first-order lag element, there are following situations, that is, such as Figure 42
(b), shown in Figure 44, by the frequency Correction and Control of power-converting device (PCS1) to contribute active power to become unbalanced
In the case of, as shown in (c) of Figure 42, Figure 44, even if the frequency Correction and Control of the power-converting device (PCS2) after passing through,
The unbalanced of contribution active power can not be eliminated.Then, as shown in (d) of Figure 42, Figure 44, even if completing frequency amendment control
System, contribution active power also become unbalanced.
Similarly, the power-converting device that participation operates parallel is not based on common voltage correction value and is repaiied to implement voltage
Positive control, and individual voltage correction value derived from institute is used in each power-converting device to implement voltage amendment control
System.
Therefore, inferior in the small situation of the time constant of voltage first-order lag element, there are following situations, that is, such as Figure 43
(b), shown in Figure 45, by the voltage Correction and Control of power-converting device (PCS1) to contribute reactive power to become unbalanced
In the case of, as shown in (c) of Figure 43, Figure 45, even if the voltage Correction and Control of the power-converting device (PCS2) after passing through,
The unbalanced of contribution reactive power can not be eliminated.Then, as shown in (d) of Figure 43, Figure 45, even if completing voltage amendment control
System, contribution reactive power also become unbalanced.
(embodiment 4)
In the present embodiment, it is described as follows situation, that is, by applying the power-converting device operated parallel in participation total
It enjoys frequency correction value and voltage correction value and is cooperated to implement the action of Correction and Control, to make new power converter
Device in the power-converting device of operating for participating in parallel the case where operating.
Figure 28 is the figure of an example for the structure for showing the power-converting device involved by present embodiment.
Figure 29 is the figure of an example for the structure for showing the command value correction portion in Correction and Control portion.
As shown in figure 28, power-converting device 400 has power converter portion 210, voltage detection department 214, current detecting part
215 and AC power control unit 450.
AC power control unit 450 has droop control portion 230, Correction and Control portion 440, voltage to frequency control unit 220.
As shown in figure 28, Correction and Control portion 440 has output condition monitoring portion 241, data store 242, command value are repaiied
Positive portion 443, Cooperation controlling portion 345, network interface portion 346.
As shown in Figure 28, Figure 29, command value correction portion 443 has 347 ω of frequency correction value comparing section, voltage correction value ratio
444 ω of switch portion is corrected compared with portion 347v, frequency, voltage corrects switch portion 444v, 244 ω of frequency first-order lag element, voltage one
Rank lags element 244v.
Frequency corrects 444 ω of switch portion and chooses whether the frequency correction value that will be exported from 347 ω of frequency correction value comparing section
It is input to 244 ω of frequency first-order lag element.If frequency, which corrects 444 ω of switch portion, to be become activating (Active), frequency is repaiied
Positive value is input to 244 ω of frequency first-order lag element, implements frequency Correction and Control.If frequency, which corrects 444 ω of switch portion, becomes non-
Activation, then be not input to 244 ω of frequency first-order lag element by frequency correction value, do not implement frequency Correction and Control.That is, by frequency
It corrects 444 ω of switch portion and is switched to state of activation, be the parallel instruction that instruction makes power-converting device 300 implement to operate parallel.
Voltage amendment switch portion 444v chooses whether the voltage correction value exported from voltage correction value comparing section 347v is defeated
Enter to voltage first-order lag element 244v.If voltage, which corrects switch portion 444v, to be become activating, voltage correction value is input to electricity
First-order lag element 244v is pressed, voltage Correction and Control is implemented.If voltage, which corrects switch portion 444v, becomes inactive, not by voltage
Correction value is input to voltage first-order lag element 244v, does not implement voltage Correction and Control.That is, voltage amendment switch portion 444v is cut
It is changed to state of activation, is the parallel instruction that instruction makes power-converting device 300 implement to operate parallel.
Each portion and each function for constituting Correction and Control portion 440 can be made of hardware or software.It is corrected constituting
In the case that each portion of control unit 440 and each function are by software realization, for example, Correction and Control portion 440 includes CPU (not shown)
(or application specific processor), CPU execute the program that is stored in memory (not shown) etc. to realize each portion and each function.
The programmable logic controller (PLC) (PLC) for being equipped on power-converting device 300 can be used for example in Correction and Control portion 440
To realize.
[The Kong Zhifangfa ] of frequency and voltage when parallel operating;
Next, explanation makes the power-converting device 400 involved by present embodiment participate in the method operated parallel.
Here, for make another power-converting device 300 (PCS2) relative to load 130 supply AC powers electricity
The case where force conversion system 400 (PCS1) operates parallel illustrates.In addition, two power-converting devices 300 (PCS1,
PCS2 in), if the controlling cycle Δ t of inverter is identical, and the control timing of inverter and the control of PLC timing are different.
Figure 30 is the figure of the FREQUENCY CONTROL and the involved flow chart of voltage control when showing to operate parallel.Figure 31 is to show
The figure of the droop characteristic involved by FREQUENCY CONTROL when going out parallel operating.Figure 32 is involved by voltage control when showing to operate parallel
And droop characteristic figure.Figure 33 is the figure of the sequence diagram involved by FREQUENCY CONTROL when showing to operate parallel.Figure 34 is to show
The figure of the involved sequence diagram of voltage control when parallel operating.
As shown in figure 30, in order to participate in parallel operating, by implementing rated output process S310, frequency droop controls process
The each process of S320, frequency Correction and Control process S325, voltage droop control process S330, voltage Correction and Control process S335,
To control the output frequency and output voltage of AC power.
[Rated output process S310, frequency droop control process S320]
In the initial state, power-converting device 300 (PCS1) exports AC power with rated frequency and rated voltage,
It is supplied to load 130.Moreover, in moment T1, power-converting device 300 (PCS2) is connected to the alternating current line of force 120.At this point,
As shown in (a) of Figure 31, (a) of Figure 32, Figure 33, Figure 34, from power-converting device 300 (PCS2) contribution active power with
And contribution reactive power is all " 0 ".At this point, the frequency of power-converting device 300 (PCS2) corrects 444 ω of switch portion and voltage
It is inactive to correct switch portion 444v.
Next, in moment T2, by parallel instruction, frequency amendment 444 ω of switch portion is switched to state of activation.Such as figure
Shown in 31 (b), Figure 33, power-converting device 300 (PCS2) is based on the frequency correction value of power-converting device 300 (PCS1),
Output frequency and contribution active power is set to increase.
In this way, making another power-converting device 300 (PCS2) become for supplying the electric power of AC power to load 130
Changing device 300 (PCS1) parallel operate when, another power-converting device 300 (PCS2) frequency correct 444 ω of switch portion with
And voltage correct switch portion 444v be it is inactive in the state of start parallel operating, after starting parallel operating, make frequency amendment
444 ω of switch portion and voltage, which correct switch portion 444v, becomes the state of activation.
Moreover, in the inverter control timing T3 of power-converting device 300 (PCS1), such as (c) and Figure 33 institute of Figure 31
Show, the active power of power-converting device 300 (PCS1) contribution reduces.It is adjoint and this, power-converting device 300 (PCS1) it is defeated
Go out frequency to be temporarily increased.
As shown in figure 33, because between power-converting device 300 (PCS1) and power-converting device 300 (PCS2),
The inverter control period, there are deviations, thus and contribution the corresponding frequency droop amount of active power also generate deviation.In the feelings
Under condition, electric current is flowed through in the form of flowing between power-converting device 300 (PCS1) and power-converting device 300 (PCS2).This
Kind electric current is restrained during inverter control period Δ t, is become in the output frequency of power-converting device 300 (PCS1, PCS2)
It is balanced when being identical.
[Frequency Correction and Control process S325, voltage droop control process S330]
Next, in inverter control timing (T2+ Δ t), the power converter of next power-converting device 300 (PCS2)
Device 300 (PCS2) will be in the internal frequency correction value that participate in the whole power-converting devices 300 (PCS1, PCS2) operated parallel
Maximum value as frequency correction value.Power-converting device 300 (PCS2) implements frequency amendment control based on the frequency correction value
System.At this point, as shown in (b) of Figure 31, Figure 33, because the contribution active power of power-converting device 300 (PCS1) becomes than electric power
Changing device 300 (PCS2) greatly, if so frequency droop rate is almost equal, the internal frequency of power-converting device 300 (PCS1)
Correction value is larger.In this case, power-converting device 300 (PCS2) is by the internal frequency of power-converting device 300 (PCS1)
Correction value implements frequency Correction and Control as frequency correction value.
In contrast, it for power-converting device 300 (PCS1), is correspondingly corrected with the contribution active power reduced defeated
Go out frequency, as shown in (c) of Figure 31, Figure 33, output frequency reduces for the time being.But because come from power-converting device 300
(PCS2) contribution active power increases, so the contribution active power of power-converting device 300 (PCS1) further decreases, companion
With with this, output frequency rise.
If implementing these actions repeatedly, the frequency of power-converting device 300 (PCS1) and power-converting device 300 (PCS2)
Rate correction value becomes balancing.Then, the frequency amendment of power-converting device 300 (PCS1) and power-converting device 300 (PCS2)
Value no longer changes, as shown in (d) of Figure 31, Figure 33, to 130 supply of load while liberally load sharing under rated frequency
AC power.
Next, account for voltage controls.Voltage amendment switch portion 444v is switched to by parallel instruction in moment T2
State of activation.As shown in (b) of Figure 32, Figure 34, power-converting device 300 (PCS2) is based on power-converting device 300 (PCS1)
Voltage correction value, make output voltage and contribution reactive power increase.
In this way, making another power-converting device 300 (PCS2) become for supplying the electric power of AC power to load 130
Changing device 300 (PCS1) parallel operate when, another power-converting device 300 (PCS2) frequency correct 444 ω of switch portion with
And voltage correct switch portion 444v be it is inactive in the state of start parallel operating, after starting parallel operating, make frequency amendment
444 ω of switch portion and voltage, which correct switch portion 444v, becomes the state of activation.
Moreover, in the inverter control timing T3 of power-converting device 300 (PCS1), such as (c) and Figure 34 institute of Figure 32
Show, the reactive power of power-converting device 300 (PCS1) contribution reduces.It is adjoint and this, power-converting device 300 (PCS1) it is defeated
Go out voltage to be temporarily increased.
As shown in figure 34, because between power-converting device 300 (PCS1) and power-converting device 300 (PCS2),
The inverter control period, there are deviations, thus and contribution the corresponding voltage sag of chain of reactive power also generate deviation.In the feelings
Under condition, electric current is flowed through in the form of flowing between power-converting device 300 (PCS1) and power-converting device 300 (PCS2).This
Kind electric current is restrained during inverter control period Δ t, is become in the output voltage of power-converting device 300 (PCS1, PCS2)
It is balanced when being identical.
[Voltage Correction and Control process S335]
Next, in inverter control timing (T2+ Δ t), the power converter of next power-converting device 300 (PCS2)
Device 300 (PCS2) will be in the builtin voltage correction value that participate in the whole power-converting devices 300 (PCS1, PCS2) operated parallel
Maximum value as voltage correction value.Power-converting device 300 (PCS2) implements voltage amendment control based on the voltage correction value
System.At this point, as shown in (b) of Figure 32, Figure 34, the contribution reactive power of power-converting device 300 (PCS1) is filled than power converter
Set 300 (PCS2) greatly, if so the sagging rate of voltage is almost equal, the builtin voltage amendment of power-converting device 300 (PCS1)
It is worth larger.In this case, power-converting device 300 (PCS2) is by the builtin voltage amendment of power-converting device 300 (PCS1)
Value implements voltage Correction and Control as voltage correction value.
In contrast, it in power-converting device 300 (PCS1), is correspondingly corrected with the contribution reactive power reduced defeated
Go out voltage, as shown in (c) of Figure 32, Figure 34, output voltage reduces for the time being.But because come from power-converting device 300
(PCS2) contribution reactive power increases, so the contribution reactive power of power-converting device 300 (PCS1) further decreases, with
This accompanies, and output voltage rises.
If implementing these actions repeatedly, the electricity of power-converting device 300 (PCS1) and power-converting device 300 (PCS2)
Pressure correction value becomes balancing.Then, the voltage amendment of power-converting device 300 (PCS1) and power-converting device 300 (PCS2)
Value no longer changes, as shown in (d) of Figure 32, Figure 34, to 130 supply of load while liberally load sharing under rated voltage
AC power.
According to the present embodiment, for power-converting device 300 (PCS2), frequency corrects 444 ω of switch portion and voltage
It corrects switch portion 444v to start to operate parallel with inactive state, and after starting parallel operating, frequency amendment is made to open
444 ω of pass portion and voltage, which correct switch portion 444v, becomes the state of activation.Hereby it is possible to power-converting device 300
(PCS1) and power-converting device 300 (PCS2) implements droop control and Correction and Control, while it is negative liberally to share it
It carries.By this method, power-converting device 300 (PCS2) can be made to participate in parallel operating.
There is illustrated make a power-converting device in the state of making power-converting device 300 (PCS1) operating
300 (PCS1) participate in the example operated parallel, but are not limited to such case.For example, more power converter dresses can be made
In the state of setting 300 operatings, one or more power-converting device 300 is made to participate in parallel operating.
[From the ] operated parallel;
If using the control method involved by present embodiment, implementing simultaneously by more power-converting devices 300
In the case of row operating, any one power-converting device 300 can be made to be detached from from parallel operating.Specifically, by making needle
It is invalid to the parallel instruction for the power-converting device 300 to be detached from so that not implement in the power-converting device to be detached from 300
Correction and Control becomes " 0 " to make contribution active power and contribution reactive power continuously decrease.
By combining this action, so as to easily implement to consider DC power supply generated energy or charge volume spirit
System variation living.
(embodiment 5)
In the present embodiment, the case where illustrating that solar panel (QV plates) is used to be used as DC power supply.Figure 35 is to show
Go out the figure of an example of the system involved by present embodiment.In the present embodiment, by using 1~3 institute of the above embodiment
The power-converting device 200,300 being related to, to implement the droop control and Correction and Control of frequency and voltage.
Power-converting device 200,300 (PCS1) is connected with solar panel 131 in DC side, is connected in exchange side
The alternating current line of force 120.Power-converting device 200,300 (PCS2) is connected with solar panel 132 in DC side, in exchange side
It is connected with the alternating current line of force 120.
Solar panel is connected to the power-converting device not have systematic state to carry out concurrent activity by the past
When, according to the intensity of solar radiation for being irradiated to the solar panel, the active power and nothing contributed from power-converting device
Work(power changes.Because in most cases, implementing maximum power point control.Therefore, frequency caused by droop control
The sag of chain of rate and voltage also changes in the same manner as solar radiation.
But if use 200,300 pairs of the above-mentioned power-converting device frequency sagging by droop control and voltage
It is modified control, then can inhibit the variation of frequency caused by the variation of solar radiation.
(embodiment 6)
In the present embodiment, illustrate to use the case where accumulator is as DC power supply.Figure 36 is to show present embodiment
The figure of an example of involved system.As shown in figure 36, in the present embodiment, by using involved by the above embodiment 4
Power-converting device 400, to implement the droop control and Correction and Control of frequency and voltage.
Power-converting device 400 (PCS3) is connected with accumulator 141 in DC side, and the alternating current line of force is connected in exchange side
120.Power-converting device 400 (PCS4) is connected with accumulator 142 in DC side, and the alternating current line of force 120 is connected in exchange side.
Past, in the case of carrying out concurrent activity in the state of no system, it is difficult to make other electric power at any time
Converting means is participated in (input) and is operated parallel, or is detached from midway.But by combining above-mentioned 400 He of power-converting device
Accumulator 141,142, so as to put into power-converting device at any time according to the charged state of accumulator 141,142
400 (PCS3, PCS4), or be detached from.Hereby it is possible to carry out best utilization corresponding with battery state of charge.
(embodiment 7)
In the present embodiment, illustrate that the case where solar panel and accumulator are as DC power supply is applied in combination.
Figure 37 is the figure of an example for showing the system involved by present embodiment.
Power-converting device 200,300 (PCS1) is connected with solar panel 131 in DC side, is connected in exchange side
The alternating current line of force 120.Power-converting device 200,300 (PCS2) is connected with solar panel 132 in DC side, in exchange side
It is connected with the alternating current line of force 120.Power-converting device 400 (PCS3) is connected with accumulator 141 in DC side, is connected in exchange side
There is the alternating current line of force 120.Power-converting device 400 (PCS4) is connected with accumulator 142 in DC side, and friendship is connected in exchange side
The galvanic electricity line of force 120.
According to the structure, if implementing droop control and Correction and Control to solar panel, sun spoke can be inhibited
The variation of frequency caused by the variation penetrated.If, can be according to storage in addition, implement droop control and Correction and Control to accumulator
The charged state of battery puts into power-converting device at any time, or is detached from.Hereby it is possible to carry out accumulator
It is best to use.
In turn, can charge the electric power generated by solar panel to accumulator, apart from Li Island, coastal power plant
The area of the systems such as hinterland farther out fragility, it can be ensured that the power supply of the stabilization of load.In addition, due to thing
Therefore disaster etc. and in the case of losing system, it can be ensured that the power supply of the stabilization of load.
More than, based on the specifically clear invention researched and developed by the present inventor of embodiment, but the present invention is not limited to
The embodiment can make various changes within the scope of its spirit, this is unquestionable.
In addition, the present invention is not limited to above-mentioned embodiment, including various modifications example.For example, above-mentioned embodiment
For ease of understanding illustrate the present invention and be illustrated in detail, is not limited to the entire infrastructure that must have illustrated.
Furthermore it is possible to a part for the structure of certain embodiment is replaced into the structure of other embodiment, furthermore it is possible to
The structure of other embodiment is added in the structure of certain embodiment.In addition, a part for the structure for each embodiment,
It can carry out the addition, deletion, displacement of other structures.
In addition, above-mentioned each structure, function, processing unit, processing unit etc., such as can be by being designed with integrated circuit
Deng to use they part or all of hardware realization.In addition, above-mentioned each structure, function etc., can be explained by processor,
It executes and realizes the program of each function to be realized with software.Realize the information of program, table, file of each function etc., energy
Enough it is placed in storage devices or IC card, SD card, the DVD such as memory, hard disk, SSD (Solid State Drive, solid state disk)
Etc. in recording mediums.
In addition, for control line, information wire, the part felt the need in explanation is shown, not necessarily show production
Whole control lines, information wire on product.It can essentially think that almost all structure is mutually attached.
Symbol description
110 ... direct current powers;120 ... the alternating current line of forces;200 ... power-converting devices;210 ... power converter portions;220…
Voltage to frequency control unit;230 ... droop control portions;240 ... Correction and Control portions;243 ... command value correction portions;300 ... electric power become
Changing device;340 ... Correction and Control portions;343 ... command value correction portions;400 ... power-converting devices;440 ... Correction and Control portions;
443 ... command value correction portions.
Claims (14)
1. a kind of power-converting device, has:
Power converter portion is output to the alternating current line of force by AC power is transformed to from the direct current power of DC supply input;
AC power control unit controls output frequency and the output of the AC power exported from the power converter portion
Voltage;
Voltage detection department detects the output voltage of the AC power;With
Current detecting part detects the output current of the AC power,
The AC power control unit, load be put to the alternating current line of force and to it is described load with rated frequency with
And after rated voltage outputs the AC power, the output voltage that is detected based on the voltage detection department and described
The output current that current detecting part detects, to implement the output frequency for making the AC power and the output
The droop control that voltage reduces respectively from the rated frequency and the rated voltage, and implement by the output frequency with
And the output voltage is gradually adapted to the Correction and Control of the rated frequency and the rated voltage.
2. power-converting device according to claim 1, wherein
The AC power control unit has:
Droop control portion, be put to the alternating current line of force in load and to the load with the rated frequency and
After the rated voltage outputs the AC power, the friendship is exported based on the output voltage and the output current
The contribution active power and contribution reactive power of galvanic electricity power, based on frequency as defined in the frequency reduction amount by per unit active power
The sagging rate of rate and the contribution active power, export make the frequency droop that the output frequency is reduced from the rated frequency
Amount, based on the sagging rate of voltage as defined in the decrease amount av by per unit reactive power and the contribution reactive power, export
The voltage sag of chain for making the output voltage be reduced from the rated voltage;
The output frequency is adapted to the frequency correction value of the rated frequency by Correction and Control portion, export, is based on the frequency
Rate correction value is set for the output frequency during to the output frequency to be gradually adapted to the rated frequency
Rate carries out defined frequency targets value, and exports the voltage correction value that the output voltage is adapted to the rated voltage, base
It is set for the institute during to the output voltage is gradually adapted to the rated voltage in the voltage correction value
It states output voltage and carries out defined voltage-target;With
Voltage to frequency control unit, it is sagging based on the calculated frequency droop amount in the droop control portion and the voltage
It measures to implement the droop control, after the droop control, the frequency targets based on Correction and Control portion setting
Value and the voltage-target, to implement the output frequency and the output voltage being gradually adapted to the specified frequency
The Correction and Control of rate and the rated voltage.
3. power-converting device according to claim 2, wherein
The droop control portion has the institute that the AC power is exported based on the output voltage and the output current
The electric power operational part for stating contribution active power and the contribution reactive power, to the tribute derived from the electric power operational part
It offers active power to be multiplied with the frequency droop rate to export the frequency droop amount, to being exported by the electric power operational part
The contribution reactive power be multiplied with the sagging rate of the voltage to export the voltage sag of chain,
The Correction and Control portion has:
Condition monitoring portion is exported, monitors that the contribution active power derived from the electric power operational part and the contribution are idle
Power;
Data store stores the preset rated frequency, the rated voltage, the frequency droop rate and institute
State the sagging rate of voltage;With
Command value correction portion to the contribution active power for exporting the monitoring of condition monitoring portion and is stored in the data
The frequency droop rate in storage part is multiplied to export the frequency correction value, and the frequency correction value is input to frequency
Rate lags element, is worth being added from the gradual correction value of frequency that the frequency hysteresis element exports obtained from the rated frequency
It is set as the output frequency during to the output frequency to be gradually adapted to the rated frequency into professional etiquette
The fixed frequency targets value, and the contribution reactive power and the data of output condition monitoring portion monitoring are deposited
The sagging rate of the voltage stored in storage portion is multiplied to export the voltage correction value, and the voltage correction value is input to
Voltage delay element will be added from the gradual correction value of voltage that the voltage delay element exports obtained from the rated voltage
Value is set as carrying out for the output voltage during to the output voltage to be gradually adapted to the rated voltage
The defined voltage-target,
The voltage to frequency control unit is put to the alternating current line of force in load, will be stored in the data store
The rated frequency and the rated voltage be input to feedback control section as frequency instruction value and voltage instruction value,
And the feedback control section is based on the frequency instruction value and the voltage instruction value inputted with the rated frequency
And after the rated voltage outputs the AC power, will in the droop control portion the derived frequency droop
Amount is inputted plus value obtained from the rated frequency being stored in the data store as the frequency instruction value
To the feedback control section, will be deposited plus being stored in the data the derived voltage sag of chain in the droop control portion
Value is input to the feedback control section as the voltage instruction value obtained from the rated voltage in storage portion, described anti-
Feedback control unit implements the droop control based on the frequency instruction value and the voltage instruction value that are inputted, and by institute
It states described in the frequency targets value and the voltage-target conduct of the described instruction value correction portion setting in Correction and Control portion
Frequency instruction value and the voltage instruction value and be input to the feedback control section, the feedback control section is based on being inputted
The frequency instruction value and the voltage instruction value, to implement gradually to correct the output frequency and the output voltage
To the rated frequency and the Correction and Control of the rated voltage.
4. power-converting device according to claim 1, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
5. power-converting device according to claim 2, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
6. power-converting device according to claim 3, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
7. according to power-converting device according to any one of claims 1 to 6, wherein
The DC power supply is solar panel.
8. power-converting device according to claim 2, wherein
The droop control portion has the institute that the AC power is exported based on the output voltage and the output current
The electric power operational part for stating contribution active power and the contribution reactive power, to the tribute derived from the electric power operational part
Active power is offered to be multiplied with the frequency droop rate to export the frequency droop amount, and to being led by the electric power operational part
The contribution reactive power gone out is multiplied to export the voltage sag of chain with the sagging rate of the voltage,
The Correction and Control portion has:
Condition monitoring portion is exported, monitors that the contribution active power derived from the electric power operational part and the contribution are idle
Power;
Data store stores the preset rated frequency, the rated voltage, the frequency droop rate and institute
State the sagging rate of voltage;
Command value correction portion provides the output frequency in the Correction and Control and the output voltage;
The data transmit-receive of parallel other involved power-converting devices of operating is granted in network interface portion in fact;With
Cooperation controlling portion, other described power-converting devices involved with parallel operating cooperate to be controlled to implement the amendment
System,
Described instruction value correction portion stores the contribution active power of output condition monitoring portion monitoring and the data
The frequency droop rate stored in portion is multiplied to export internal frequency correction value, and the network interface portion receives other institutes
The internal frequency correction value of other power-converting devices of power-converting device output is stated, the Cooperation controlling portion will
The internal frequency correction value for other power-converting devices that the network interface receives is as foreign frequency amendment
It is worth and stores and arrive foreign frequency correction value storage part, and described in the whole to being stored in the foreign frequency correction value storage part
Foreign frequency correction value is compared, and is exported using the maximum foreign frequency correction value as maximum foreign frequency correction value
To described instruction value correction portion, described instruction value correction portion repaiies the internal frequency correction value and the maximum foreign frequency
Any larger value of positive value exports as the frequency correction value, and the frequency correction value is input to frequency hysteresis element, will
The gradual correction value of frequency exported from the frequency hysteresis element is set as regulation plus value obtained from the rated frequency will
The output frequency be gradually adapted to the rated frequency during the output frequency the frequency targets value, it is described
Command value correction portion in the contribution reactive power of output condition monitoring portion monitoring and the data store to storing
The sagging rate of the voltage be multiplied to export builtin voltage correction value, the network interface portion receives other described electric power and becomes
The builtin voltage correction value of other power-converting devices of changing device output, the Cooperation controlling portion is by the network
Interface to the builtin voltage correction values of other power-converting devices stored as external voltage correction value
To external voltage correction value storage part, and the whole external voltage to being stored in the external voltage correction value storage part
Correction value is compared, and the finger is output to using the maximum external voltage correction value as maximum external voltage correction value
Enable value correction portion, described instruction value correction portion is appointed the builtin voltage correction value and the maximum external voltage correction value
One larger value exports as the voltage correction value, and the voltage correction value is input to voltage delay element, will be from the electricity
The gradual correction value of voltage of pressure lag element output is set as regulation by the output plus value obtained from the rated voltage
Voltage be gradually adapted to the rated voltage during the output voltage the voltage-target,
The voltage to frequency control unit is put to the alternating current line of force in load, will be stored in the data store
The rated frequency and the rated voltage be input to feedback control section as frequency instruction value and voltage instruction value,
And the feedback control section is based on the frequency instruction value and the voltage instruction value inputted with the rated frequency
And after the rated voltage outputs the AC power, will in the droop control portion the derived frequency droop
Amount is inputted plus value obtained from the rated frequency being stored in the data store as the frequency instruction value
To the feedback control section, will be deposited plus being stored in the data the derived voltage sag of chain in the droop control portion
Value is input to the feedback control section as the voltage instruction value obtained from the rated voltage in storage portion, described anti-
Feedback control unit implements the droop control based on the frequency instruction value and the voltage instruction value that are inputted, will be described
The frequency targets value of the described instruction value correction portion setting in Correction and Control portion and the voltage-target are as the frequency
Rate command value and the voltage instruction value and be input to the feedback control section, the feedback control section is based on the institute inputted
Frequency instruction value and the voltage instruction value are stated, implements the output frequency and the output voltage being gradually adapted to institute
State the Correction and Control of rated frequency and the rated voltage.
9. power-converting device according to claim 8, wherein
Described instruction value correction portion has:
Frequency corrects switch portion, chooses whether the frequency correction value being input to the frequency hysteresis element;With
Voltage corrects switch portion, chooses whether the voltage correction value being input to the voltage delay element.
10. power-converting device according to claim 9, wherein
Make the other power-converting device relative to the power-converting device of the load supply AC power
When parallel operating,
It is inactive that the other power-converting device corrects switch portion and voltage amendment switch portion in the frequency
In the state of start parallel operating,
After starting parallel operating, make the shape that the frequency corrects switch portion and voltage amendment switch portion becomes activation
State.
11. power-converting device according to claim 8, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
12. power-converting device according to claim 9, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
13. power-converting device according to claim 10, wherein
In the case where making multiple power-converting devices operate parallel, in each power-converting device described in implementation
Droop control and the Correction and Control.
14. the power-converting device according to any one of claim 8~13, wherein
The DC power supply is accumulator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016078724A JP6609506B2 (en) | 2016-04-11 | 2016-04-11 | Power converter |
| JP2016-078724 | 2016-04-11 | ||
| PCT/JP2017/006584 WO2017179306A1 (en) | 2016-04-11 | 2017-02-22 | Power conversion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108702103A true CN108702103A (en) | 2018-10-23 |
| CN108702103B CN108702103B (en) | 2020-09-11 |
Family
ID=60042635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780010117.XA Expired - Fee Related CN108702103B (en) | 2016-04-11 | 2017-02-22 | Power conversion device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6609506B2 (en) |
| CN (1) | CN108702103B (en) |
| WO (1) | WO2017179306A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN110838799A (en) * | 2019-09-27 | 2020-02-25 | 湖南沃森电气科技有限公司 | Inverter droop method for realizing uniform load under multi-drive transmission |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112106288B (en) * | 2018-05-15 | 2023-11-24 | 三菱电机株式会社 | Power conversion device and power conversion system |
| JP7351620B2 (en) * | 2019-02-01 | 2023-09-27 | 三菱重工エンジン＆ターボチャージャ株式会社 | Command generation device and command generation method in multiple generation power supply system |
| KR20200117152A (en) * | 2019-04-03 | 2020-10-14 | 엘에스일렉트릭(주) | Apparatus for controlling inverter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003111428A (en) * | 2001-09-28 | 2003-04-11 | Denyo Co Ltd | Inverter controlled engine generator |
| US20130073109A1 (en) * | 2011-09-16 | 2013-03-21 | Po-Tai Cheng | Droop control system for grid-connected synchronization |
| CN103414207A (en) * | 2013-07-15 | 2013-11-27 | 中国科学院电工研究所 | Droop control-based smooth switching method |
| CN103956778A (en) * | 2014-04-16 | 2014-07-30 | 中国科学院广州能源研究所 | Micro-grid system and networking method based on phase angle droop control |
| CN104578144A (en) * | 2014-12-15 | 2015-04-29 | 浙江大学 | Anti-sagging control method for photovoltaic inverter in microgrid |
| CN105429170A (en) * | 2015-11-11 | 2016-03-23 | 中南大学 | Micro-grid inverter droop control method based on adjustable virtual impedance |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3679949B2 (en) * | 1999-06-29 | 2005-08-03 | 東芝トランスポートエンジニアリング株式会社 | Railway train power supply system |
| EP2940826B1 (en) * | 2012-12-27 | 2018-01-31 | Kawasaki Jukogyo Kabushiki Kaisha | Combined power generation system having power converting device |
| DE112014004589T5 (en) * | 2013-10-02 | 2016-08-18 | Murata Manufacturing Co., Ltd. | Power system |
-
2016
- 2016-04-11 JP JP2016078724A patent/JP6609506B2/en active Active
-
2017
- 2017-02-22 WO PCT/JP2017/006584 patent/WO2017179306A1/en active Application Filing
- 2017-02-22 CN CN201780010117.XA patent/CN108702103B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003111428A (en) * | 2001-09-28 | 2003-04-11 | Denyo Co Ltd | Inverter controlled engine generator |
| US20130073109A1 (en) * | 2011-09-16 | 2013-03-21 | Po-Tai Cheng | Droop control system for grid-connected synchronization |
| CN103414207A (en) * | 2013-07-15 | 2013-11-27 | 中国科学院电工研究所 | Droop control-based smooth switching method |
| CN103956778A (en) * | 2014-04-16 | 2014-07-30 | 中国科学院广州能源研究所 | Micro-grid system and networking method based on phase angle droop control |
| CN104578144A (en) * | 2014-12-15 | 2015-04-29 | 浙江大学 | Anti-sagging control method for photovoltaic inverter in microgrid |
| CN105429170A (en) * | 2015-11-11 | 2016-03-23 | 中南大学 | Micro-grid inverter droop control method based on adjustable virtual impedance |
Non-Patent Citations (1)
| Title |
|---|
| LIU TING ET AL.: ""A novel droop control strategy to share power equally and limit voltage deviation"", 《8TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS-ECCE ASIA，2011》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838799A (en) * | 2019-09-27 | 2020-02-25 | 湖南沃森电气科技有限公司 | Inverter droop method for realizing uniform load under multi-drive transmission |
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN110762794B (en) * | 2019-10-31 | 2021-07-20 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017192166A (en) | 2017-10-19 |
| CN108702103B (en) | 2020-09-11 |
| JP6609506B2 (en) | 2019-11-20 |
| WO2017179306A1 (en) | 2017-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108702103A (en) | Power-converting device | |
| KR101605272B1 (en) | Method and apparatus for controlling a hybrid power system | |
| CN102170241B (en) | System and method for a single stage power conversion system | |
| CN111817326B (en) | Distributed energy storage SOC control and integration method under alternating current micro-grid island mode | |
| US20130285457A1 (en) | Cascaded multilevel inverter and method for operating photovoltaic cells at a maximum power point | |
| Teekaraman et al. | Fuzzy based analysis of inverter fed micro grid in islanding operation-experimental analysis | |
| CN106451544B (en) | A kind of united three level grid-connected system control method of light storage | |
| Verma et al. | Decentralized Master-Slave operation of microgrid using current controlled distributed generation sources | |
| Guzman et al. | Load sharing strategy for autonomous AC microgrids based on FPGA implementation of ADALINE&FLL | |
| Rao et al. | Improvement of power quality using fuzzy logic controller in grid connected photovoltaic cell using UPQC | |
| US11502618B2 (en) | DC photovoltaic input emulation using an AC generator source | |
| Vandoorn et al. | Power balancing in islanded microgrids by using a dc-bus voltage reference | |
| CN103999319A (en) | Adaptive load sharing of parallel inverters system | |
| Ghani et al. | Simulation model linked PV inverter implementation utilizing dSPACE DS1104 controller | |
| CN114846716A (en) | Controlling the on-time of an energy module of an energy store | |
| Radwan et al. | Bidirectional power management in hybrid AC-DC islanded microgrid system | |
| CN105048837B (en) | controller for grid-connected inverter system | |
| Kumar et al. | Voltage control and power balance in a standalone microgrid supported from solar PV system | |
| D’silva et al. | Autonomous power reserve control for cluster of photovoltaic sources in microgrids | |
| CN103825303B (en) | For the control appliance of hybrid power system | |
| US11451054B2 (en) | Systems and methods for shunt power factor correction | |
| CN110277793A (en) | A kind of two-stage type photovoltaic DC-to-AC converter active power balance control method | |
| Lee et al. | Small-signal modeling, integration, and hardware implementation for optimized DC distribution system based on hierarchical control master–slave structure | |
| Chen et al. | CERTS microgrids with photovoltaic microsources and feeder flow control | |
| KR102133558B1 (en) | Cell balancing apparatus and method using fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200911 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |