CN1450705A - Method and device for controlling parallel power sources - Google Patents
Method and device for controlling parallel power sources Download PDFInfo
- Publication number
- CN1450705A CN1450705A CN 02106082 CN02106082A CN1450705A CN 1450705 A CN1450705 A CN 1450705A CN 02106082 CN02106082 CN 02106082 CN 02106082 A CN02106082 A CN 02106082A CN 1450705 A CN1450705 A CN 1450705A
- Authority
- CN
- China
- Prior art keywords
- command signal
- output
- voltage
- power supply
- signal
- 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
Images
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
This invention provides a control method and device for a parallel power supplier including at leasr two power source suppliers. The control method provides an analog impedance to the said supplier to increase the output impedance of the supplier in parallel to make them connect directly in parallel without using a connect reactor to adjust an output voltage reference quasi-position of the said supplier to control the two to have the same actual power output.
Description
(1) technical field
The relevant a kind of parallel power sources device of the present invention and be applied to the control method of this parallel power sources is mainly used in the parallel running of UPS, with the output impedance that a virtual impedance is provided and improves the UPS that is connected in parallel.
(2) background technology
When the parallel operation system that considers a power supply unit, as short its steady running of desire, need between this parallel power sources, to exist enough impedance operators, the different generating sets of present utility power company are parallel operation directly, is because this parallel generator group itself and power transmission and distribution networking have existed due to the suitable reactive; In addition, for different generator parallel runnings etc. the power output assignment problem, according to the direction of energy theory analysis of electric power system, can explain via following formula:
P
oi＝(V
oiV
o/X
s)sinδ
I (1)
Q
oi＝(V
oiV
ocosδI-V
o 2)/X
s (2)
Wherein, the real power output of every generator of Poi representative, the fictitious power output of every generator of Qoi representative, Q
OiRepresent the power angle between parallel generator, Xs represents the binding reactance between parallel generator, an output voltage of every generator of Voi representative, and Vo represents the output voltage of this parallel system, and i is 1,2,3 ...Can find out by formula (1), work as δ
IValue very hour, this real power output valve Poi is and this power angle δ
IRelevant, and this fictitious power is defeated, and to be worth Qoi be relevant with this output voltage V oi, therefore desire is controlled this real power output valve of every generator, can realize by an operating frequency value that changes this generator, this fictitious power output valve of every generator of desire control, can utilize the accurate position of the output voltage of adjusting generator to finish, this is the prior art of power supply parallel connection, and has been widely used in the power transmission and distribution control of electric power system.
(3) summary of the invention
Main purpose of the present invention is to provide a kind of control method and device of parallel power sources, make this parallel power sources have a virtual impedance, output impedance when increasing parallel connection can directly be connected in parallel this parallel power sources and need not to use one to connect reactor.
Secondary objective of the present invention is to provide a kind of control method and device of parallel power sources, make this parallel power sources have a virtual impedance, output impedance when increasing parallel connection, this parallel power sources can directly be connected in parallel, and need not to use one to connect reactor, and control every power supply unit by the output voltage of adjusting this power supply unit with reference to accurate position and have identical real power output.
According to conception of the present invention, this control method is to be applied to a power supply unit in parallel, this parallel power sources comprises at least two power supply units, this control method provides this power supply unit one virtual impedance, one output impedance of this power supply unit when increasing parallel connection, this power supply unit directly is connected in parallel, to provide an ac output voltage and an ac output current to a load; Be characterized in that this control method of arbitrary power supply unit comprises the following steps: to detect this ac output voltage, produce an ac output voltage signal; Detect this ac output current, produce an ac output current signal; Convert this ac output current signal to one first ac voltage signal through this virtual impedance, to increase the output impedance of this power supply unit; Set one first alternating voltage command signal, be used to control the real power output and the fictitious power output of this power supply unit; This first alternating voltage command signal and this first ac voltage signal are compared, to produce one second alternating voltage command signal; This second alternating voltage command signal and this ac output voltage signal are compared,, control this power supply unit and stablize this ac output voltage to produce one the 3rd alternating voltage command signal.
According to above-mentioned conception, the numerical value of wherein setting this virtual impedance makes this virtual impedance become the main output impedance of this power supply unit greater than original this output impedance of this power supply unit itself.
According to above-mentioned conception, wherein this virtual impedance is a resistive impedance.
According to above-mentioned conception, wherein this first alternating voltage command signal comprises a transformation size and a phase place, by controlling this voltage swing controlling the output of this real power, and by controlling this phase place to control the output of this fictitious power.
According to above-mentioned conception, wherein control the voltage swing of this first alternating voltage command signal of this power supply unit respectively, make this power supply unit have identical real power output.
According to a further aspect of the invention, a kind of parallel power sources is provided, it comprises at least two power supply units, this power supply unit provides a virtual impedance, and the output impedance of this power supply unit when increasing parallel connection makes this power supply unit directly in parallel, to provide an ac output voltage and an ac output current to a load, be characterized in that any power supply unit comprises: a reference voltage generator provides a direct current reference voltage signal; One voltage feedback controller, it is electrically connected this ac output voltage, feeds back this ac output voltage, exchanges feedback voltage signal to produce one; One rectifier filter, it is electrically connected this voltage feedback controller, should exchanging the feedback voltage signal rectifying and wave-filtering, and produces a direct current feedback voltage signal; One first comparator, it is electrically connected this reference voltage generator and this filter, with this DC reference voltage signal and this DC feedback voltage signal relatively, and produces one first direct voltage command signal; One direct current voltage commands compensator, it is electrically connected this first comparator, so that this first direct voltage command signal is compensated, and produces one second direct voltage command signal; One string wave generator, it provides a string ripple signal; One multiplier, it is electrically connected this direct voltage order compensator and this string wave generator, with this second direct voltage command signal and this string ripple signal multiplication, and produces one first alternating voltage command signal; One current sensor, it is electrically connected this ac output current, detects this ac output current, to produce an ac output current command signal; One virtual impedance generator, it is electrically connected this current sensor, so that a virtual impedance to be provided, this virtual impedance and this ac output current command signal multiply each other, to produce one second alternating voltage command signal, this virtual impedance generator is to be used to provide this virtual impedance, to increase the output impedance of this power supply unit; One first subtracter, it is electrically connected this multiplier and this virtual impedance generator, so that this first alternating voltage command signal and this second alternating voltage command signal are subtracted each other, and produces one the 3rd alternating voltage command signal; One second subtracter, it is electrically connected this first subtracter and this voltage feedback controller, subtracts each other so that the 3rd alternating voltage command signal is exchanged feedback voltage signal with this, and produces one the 4th alternating voltage command signal; One alternating voltage order compensator, it is electrically connected this second subtracter, so that the 4th alternating voltage command signal is compensated, and produces one the 5th alternating voltage command signal; One triggers drive signal generation circuit, and it is electrically connected this alternating voltage order compensator, the conversion of the 5th alternating voltage command signal is produced one trigger drive signal; And one switch switching device, and it is electrically connected this a triggerings drive signal generation circuit and an input power supply, exports an ac output voltage should import the power supply switching.
According to above-mentioned conception, wherein the numerical value of this virtual impedance makes this virtual impedance become the main output impedance of this power supply unit greater than the original output impedance of this power supply unit itself.
According to above-mentioned conception, wherein this virtual impedance is a load impedance.
According to above-mentioned conception, wherein this DC reference voltage signal is the real power output size that is used to control this power supply unit.
According to above-mentioned conception, wherein the phase value of this string ripple signal is the fictitious power output size that is used to control this power supply unit.
According to above-mentioned conception, wherein control the size of this DC reference voltage signal, make this power supply unit have this identical real power output.
According to above-mentioned conception, wherein this power supply unit also comprises a choke-condenser filter, and it is electrically connected this converting switch device, with to this output voltage filtering.
According to above-mentioned conception, wherein this rectifier filter is a peak value counting circuit.
According to above-mentioned conception, wherein this rectifier filter is a root-mean-square value counting circuit.
A kind of parallel power sources is provided according to a further aspect of the invention, it comprises at least two power supply units, this power supply unit provides a virtual impedance, the output impedance of this power supply unit when increasing parallel connection, make this power supply unit directly in parallel,, be characterized in to provide an ac output voltage and an ac output current to a load, any power supply unit comprises: a reference voltage generator provides a direct current reference voltage signal; One voltage feedback controller, it is electrically connected this ac output voltage, feeds back this ac output voltage, exchanges feedback voltage signal to produce one; One string wave generator, it provides a string ripple signal; One multiplier, it is electrically connected this reference voltage generator and this string wave generator, with this DC reference voltage signal and this string ripple signal multiplication, and produces one first alternating voltage command signal; One current sensor, it is electrically connected this ac output current, detects this ac output current, to produce an ac output current command signal; One virtual impedance generator, it is electrically connected this current sensor, so that a virtual impedance to be provided, this virtual impedance and this ac output current command signal multiply each other, to produce one second alternating voltage command signal, this virtual impedance generator is to be used to provide this virtual impedance, to increase the output impedance of this power supply unit; One first subtracter, it is electrically connected this multiplier and this virtual impedance generator, so that this first alternating voltage command signal and this second alternating voltage command signal are subtracted each other, and produces one the 3rd alternating voltage command signal; One second subtracter, it is electrically connected this first subtracter and this voltage feedback controller, subtracts each other so that the 3rd alternating voltage command signal is exchanged feedback voltage signal with this, to produce one the 4th alternating voltage command signal; One feedforward compensation device, it is electrically connected this first subtracter, so that the 3rd alternating voltage command signal compensation conversion is produced one first alternating current command signal; One alternating voltage order compensator, it is electrically connected this second subtracter, produces one second alternating current command signal the 4th alternating voltage command signal is compensated conversion; One adder, it is electrically connected this alternating voltage order compensator and this feedforward compensation device, so that this first alternating current command signal and this second alternating current command signal are synthesized generation one capacitance current command signal; One alternating current calculates device, and it is electrically connected this voltage feedback controller, produces a capacitance current signal so that this interchange feedback voltage signal is changed; One the 3rd subtracter, it is electrically connected this adder and this alternating current and calculates device, with this capacitance current command signal and this capacitance current signal subtraction, and produces one the 3rd alternating current command signal; One alternating current order compensator, it is electrically connected the 3rd subtracter, so that the 3rd alternating current command signal is compensated, and produces one the 4th alternating current command signal; One triggers drive signal generation circuit, and it is electrically connected this alternating current order compensator, triggers drive signal so that the conversion of the 4th alternating current command signal is produced one; And one switch switching device, and it is electrically connected this a triggerings drive signal generation circuit and an input power supply, exports an ac output voltage should import the power supply switching.
For further specifying purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 (a) ~ (b) is the circuit diagram with parallel power sources of virtual resistance characteristic of the present invention.
Fig. 2 (a) ~ (b) is the schematic diagram of real power-dropping voltage characteristic of the present invention and fictitious power-frequency falling characteristic.
Fig. 3 is the circuit diagram of power supply unit of the tool virtual resistance characteristic of the present invention's first preferred embodiment.
Fig. 4 is the circuit diagram of power supply unit of the tool virtual resistance characteristic of the present invention's second preferred embodiment.
(5) embodiment
Seeing also Fig. 1 (a) ~ (b), is the circuit diagram of the parallel power sources of tool virtual resistance characteristic of the present invention.As shown in Figure 1, one first power supply unit 1 is to represent with one first voltage source V, 01 series connection, one first output impedance Z01, one second source supply 2 is to represent with one second voltage source V, 02 series connection, one second output impedance Z02, this power supply unit is to be electrically connected a resistance respectively, is electrically connected with a load again.
Yet this resistance is a virtual resistance R, and this virtual resistance R is simulated by the characteristic (resistive voltage droop) of a resistance drop by this power supply unit 1,2 to get.This power supply unit 1,2 thereby directly connection connect reactor and need not to add one.When this virtual resistance R much larger than this output impedance Z01, Z02, the equivalent circuit diagram of this parallel power sources then is shown in Fig. 1 (b).Utilize the circuitry basic principle can derive following equation this moment:
P
oi＝(V
oiV
ocosδi-V
o 2)/R (3)
Q
oi＝(V
oiV
o/R)sinδi (4)
Wherein, Poi is the real power output of every power supply unit, and Qoi is the fictitious power output of every power supply unit, and δ i represents power angle (power angle), that is phase place, the output voltage of every power supply unit of Voi representative, Vo is the output voltage of this parallel system, i is 1,2,3 ...By equation (3) as can be known, when δ i value very hour, this real power output valve Poi is relevant with this output voltage V oi, and this fictitious power output valve Qoi is relevant with this power angle δ i, therefore this real power output valve of every power supply unit of desire control can be finished with reference to accurate position by the output voltage of adjusting this power supply unit, and this fictitious power output valve of every power supply unit of desire control can realize by the operating frequency value of adjusting this power supply unit.
Seeing also Fig. 2 (a) ~ (b) is the schematic diagram of real power-dropping voltage characteristic of the present invention (P-V droopcharacteristics) and fictitious power-frequency falling characteristic (Q-f droop characteristics).Be depicted as the schematic diagram of real power-dropping voltage characteristic of the present invention as Fig. 2 (a), this output voltage of i power supply unit is:
V
oi＝V
noi-mi*P
oi (5)
Wherein, the voltage swing when Vnoi represents i power supply unit non-loaded, mi are represented decline coefficient (droop coefficient).And should determine its size by a predefined virtual resistance R by decline Coefficient m i.This real power output of old friend Poi then can realize by an output voltage values of adjusting this power supply unit.
In addition, if this output voltage of this power supply unit is almost equal, then can draw according to equation (4):
Q
I＝kδi (6)
See also Fig. 2 (b), Fig. 2 (b) is depicted as the schematic diagram of fictitious power of the present invention-frequency falling characteristic.This fictitious power output of old friend Qoi then can reach by an operating frequency value fi who adjusts this power supply unit.
See also Fig. 3, Fig. 3 is the circuit diagram of power supply unit of the tool virtual impedance characteristic of the present invention's first preferred embodiment.One power supply unit comprises: a reference voltage generator 3, a voltage feedback controller 4, a rectifier filter 5, one first comparator 6, a direct current voltage commands compensator 7, a string wave generator 8, a multiplier 9, a current sensor 10, a virtual impedance generator 11, one first subtracter 12, one second subtracter 13, an alternating voltage order compensator 14, trigger drive signal generation circuit 15, and switch switching device 16.This reference voltage generator 3 provides a direct current reference voltage signal V*oset.This voltage feedback controller 4, it is electrically connected this ac output voltage, feeds back this ac output voltage, produces one and exchanges feedback voltage signal Vofb.This rectifier filter 5, it is electrically connected this voltage feedback controller 4, should exchanging feedback voltage signal Vofb rectifying and wave-filtering, and produces a direct current feedback voltage signal Vofb (dc).This first comparator 6, it is electrically connected this reference voltage generator 3 and this rectifier filter 5, this DC reference voltage signal V*oset and this DC feedback voltage signal Vofb (dc) is compared, to produce one first direct voltage command signal S1.This direct voltage order compensator 7, it is electrically connected this first comparator 6, so that this first direct voltage command signal S1 is compensated, produces one second direct voltage command signal S2.This string wave generator 8, it provides a string ripple signal.This multiplier 9, it is electrically connected this direct voltage order compensator 7 and this string wave generator 8, with this second direct voltage command signal S2 and this string ripple signal multiplication, and produces one first alternating voltage command signal V*ref.This current sensor 10, it is electrically connected this ac output current, detects this ac output current, to produce an ac output current command signal io.This virtual impedance generator 11, it is electrically connected this current sensor 10, so that a virtual impedance to be provided, this virtual impedance and this ac output current command signal io multiply each other, to produce one second alternating voltage command signal S3, it is used to provide this virtual impedance this virtual impedance generator 11, to increase the output impedance of this power supply unit.This first subtracter 12, it is electrically connected this multiplier 9 and this virtual impedance generator 11, so that this first alternating voltage command signal V*ref and this second alternating voltage command signal S3 are subtracted each other, to produce one the 3rd alternating voltage command signal S4.This second subtracter 13, it is electrically connected this first subtracter 12 and this voltage feedback controller 4, subtracts each other so that the 3rd alternating voltage command signal S4 is exchanged feedback voltage signal Vofb with this, and produces one the 4th alternating voltage command signal S5.This alternating voltage order compensator 14, it is electrically connected this second subtracter 13, so that the 4th alternating voltage command signal S5 is compensated, and produces one the 5th alternating voltage command signal S6.This triggers drive signal generation circuit 15, and it is electrically connected this alternating voltage order compensator 14, triggers drive signal S7 so that the 5th alternating voltage command signal S6 conversion is produced one.And, this converting switch device 16, it is electrically connected this a triggering drive signal generation circuit 15 and an input power supply (not shown), switches output one ac output voltage Vo should import power supply.And this power supply unit also comprises a choke-condenser filter, and it is electrically connected this converting switch device 16, with to this output voltage V o filtering.
Yet this rectifier filter can be a peak value counting circuit or a root-mean-square value counting circuit.
By adjusting the real power output size that this DC reference voltage signal V*oset can control this power supply unit, make this power supply unit have identical real power output.And can control the fictitious power output size of this power supply unit by the phase value of adjusting this string ripple signal.
See also Fig. 4, Fig. 4 is the circuit diagram of the power supply unit with virtual impedance characteristic of the present invention's second preferred embodiment.One power supply unit comprises: a reference voltage generator 17, one voltage feedback controller 18, one string wave generator 19, one multiplier 20, one current sensor 21, one virtual impedance generator 22, one first subtracter 23, one second subtracter 24, one feedforward compensation device 25, one alternating voltage order compensator 26, one adder 27, one alternating current calculates device 28, one the 3rd subtracter 29, one alternating current order compensator 30, one triggers drive signal generation circuit 31 and switches switching device 32.This reference voltage generator 17 provides a direct current reference voltage signal V*oset.This voltage feedback controller 18, it is electrically connected this ac output voltage, feeding back this ac output voltage, and produces one and exchanges feedback voltage signal Vofb.This string wave generator 19, it provides a string ripple signal.This multiplier 20, it is electrically connected this reference voltage generator 17 and this string wave generator 19, with this DC reference voltage signal V*oset and this string ripple signal multiplication, and produces one first alternating voltage command signal V*ref.This current sensor 21, it is electrically connected this ac output current, detecting this ac output current, and produces an ac output current command signal io.This virtual impedance generator 22, it is electrically connected this current sensor 21, so that a virtual impedance to be provided, this virtual impedance and this ac output current command signal io multiply each other, to produce one second alternating voltage command signal S8, this virtual impedance generator 22 is to be used to provide this virtual impedance, to increase the output impedance of this power supply unit.This first subtracter 23, it is electrically connected this multiplier 20 and this virtual impedance generator 22, so that this first alternating voltage command signal V*ref and this second alternating voltage command signal S8 are subtracted each other, and produces one the 3rd alternating voltage command signal S9.This second subtracter 24, it is electrically connected this first subtracter 23 and this voltage feedback controller 18, subtracts each other so that the 3rd alternating voltage command signal S9 is exchanged feedback voltage signal Vofb with this, and produces one the 4th alternating voltage command signal S10.This feedforward compensation device 25, it is electrically connected this first subtracter 23, so that the 3rd alternating voltage command signal S9 compensation conversion is produced one first alternating current command signal S11.This alternating voltage order compensator 26, it is electrically connected this second subtracter, produces one second alternating current command signal S12 the 4th alternating voltage command signal S10 is compensated conversion.This adder 27, it is electrically connected this alternating voltage order compensator 26 and this feedforward compensation device 25, so that this first alternating current command signal S11 and this second alternating current command signal S12 are synthesized generation one capacitance current command signal ic*.This alternating current calculates device 28, and it is electrically connected this voltage feedback controller 18, this interchange feedback voltage signal Vofb is compensated conversion produce a capacitance current signal ic.The 3rd subtracter 29, it is electrically connected this adder 27 and calculates device 28 with this alternating current, so that this capacitance current command signal ic* and this capacitance current signal ic are subtracted each other, and produces one the 3rd alternating current command signal S13.This alternating current order compensator 30, it is electrically connected the 3rd subtracter 29, so that the 3rd alternating current command signal S13 is compensated, and produces one the 4th alternating current command signal S14.This triggers drive signal generation circuit 31, and it is electrically connected this alternating current order compensator 30, triggers drive signal S15 so that the 4th alternating current command signal S14 conversion is produced one.And, this converting switch device 32, it is electrically connected this a triggering drive signal generation circuit 31 and an input power supply (not being shown on the figure), switches output one ac output voltage should import power supply.
Comprehensively above-mentioned, the present invention can provide a kind of parallel power sources device and be applied to the control method of this parallel power sources, and this parallel power sources device and control method are mainly used in the parallel running of UPS.Because control method that the present invention carries can provide a virtual parallel impedance characteristic of a UPS in parallel, put a reactor that links in parallel and need not again luggage, therefore solved the disappearance of prior art UPS parallel technology.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (15)
1. the control method of a parallel power sources, this parallel power sources comprises at least two power supply units, this control method provides this power supply unit one virtual impedance, the output impedance of this power supply unit when increasing parallel connection, this power supply unit directly is connected in parallel, to provide an ac output voltage and an ac output current to a load; It is characterized in that this control method of arbitrary power supply unit comprises the following steps:
Detect this ac output voltage, produce an ac output voltage signal;
Detect this ac output current, produce an ac output current signal;
Convert this ac output current signal to one first ac voltage signal through this virtual impedance, to increase the output impedance of this power supply unit;
Set one first alternating voltage command signal, be used to control the real power output and the fictitious power output of this power supply unit;
This first alternating voltage command signal and this first ac voltage signal are compared, to produce one second alternating voltage command signal;
This second alternating voltage command signal and this ac output voltage signal are compared, and produce one the 3rd alternating voltage command signal, controlling this power supply unit, and stablize this ac output voltage.
2. the control method of parallel power sources as claimed in claim 1, it is characterized in that, comprise that also the numerical value of setting this virtual impedance greater than original this output impedance of this power supply unit itself, makes this virtual impedance become the main output impedance of this power supply unit.
3. the control method of parallel power sources as claimed in claim 2 is characterized in that, this virtual impedance is a resistive impedance.
4. the control method of parallel power sources as claimed in claim 3, it is characterized in that, this first alternating voltage command signal comprises a transformation size and a phase place, by controlling this voltage swing controlling the output of this real power, and by controlling this phase place to control the output of this fictitious power.
5. the control method of parallel power sources as claimed in claim 4 is characterized in that, also comprises the voltage swing of this first alternating voltage command signal of controlling this power supply unit respectively, so that this power supply unit has identical real power output.
6. parallel power sources, comprise at least two power supply units, this power supply unit provides a virtual impedance, the output impedance of this power supply unit when increasing parallel connection, make this power supply unit directly in parallel, to provide an ac output voltage and an ac output current, it is characterized in that any power supply unit comprises to a load:
One reference voltage generator provides a direct current reference voltage signal;
One voltage feedback controller, it is electrically connected this ac output voltage, feeds back this ac output voltage, exchanges feedback voltage signal to produce one;
One rectifier filter, it is electrically connected this voltage feedback controller, should exchanging the feedback voltage signal rectifying and wave-filtering, and produces a direct current feedback voltage signal;
One first comparator, it is electrically connected this reference voltage generator and this filter, with this DC reference voltage signal and this DC feedback voltage signal relatively, and produces one first direct voltage command signal;
One direct current voltage commands compensator, it is electrically connected this first comparator, this first direct voltage command signal is compensated, to produce one second direct voltage command signal;
One string wave generator, it provides a string ripple signal;
One multiplier, it is electrically connected this direct voltage order compensator and this string wave generator, with this second direct voltage command signal and this string ripple signal multiplication, and produces one first alternating voltage command signal;
One current sensor, it is electrically connected this ac output current, detecting this ac output current, and produces an ac output current command signal;
One virtual impedance generator, it is electrically connected this current sensor, one virtual impedance is provided, this virtual impedance and this ac output current command signal multiply each other, to produce one second alternating voltage command signal, this virtual impedance generator is used to provide this virtual impedance, to increase the output impedance of this power supply unit;
One first subtracter, it is electrically connected this multiplier and this virtual impedance generator, this first alternating voltage command signal and this second alternating voltage command signal is subtracted each other, to produce one the 3rd alternating voltage command signal;
One second subtracter, it is electrically connected this first subtracter and this voltage feedback controller, subtracts each other so that the 3rd alternating voltage command signal is exchanged feedback voltage signal with this, and produces one the 4th alternating voltage command signal;
One alternating voltage order compensator, it is electrically connected this second subtracter, so that the 4th alternating voltage command signal is compensated, and produces one the 5th alternating voltage command signal;
One triggers drive signal generation circuit, and it is electrically connected this alternating voltage order compensator, triggers drive signal so that the conversion of the 5th alternating voltage command signal is produced one; And
One switches switching device, and it is electrically connected this a triggering drive signal generation circuit and an input power supply, switches output one ac output voltage should import power supply.
7. parallel power sources as claimed in claim 6 is characterized in that, the numerical value of this virtual impedance makes this virtual impedance become the main output impedance of this power supply unit greater than the original output impedance of this power supply unit itself.
8. parallel power sources as claimed in claim 7 is characterized in that, this virtual impedance is a load impedance.
9. parallel power sources as claimed in claim 8 is characterized in that, this DC reference voltage signal is the real power output size that is used to control this power supply unit.
10. parallel power sources as claimed in claim 8 is characterized in that, the phase value of this string ripple signal is the fictitious power output size that is used to control this power supply unit.
11. parallel power sources as claimed in claim 9 is characterized in that, controls the size of this DC reference voltage signal, makes this power supply unit have this identical real power output.
12. parallel power sources as claimed in claim 6 is characterized in that, this power supply unit also comprises a choke-condenser filter, and it is electrically connected this converting switch device, with to this output voltage filtering.
13. parallel power sources as claimed in claim 6 is characterized in that, this rectifier filter is a peak value counting circuit.
14. parallel power sources as claimed in claim 6 is characterized in that, this rectifier filter is a root-mean-square value counting circuit.
15. parallel power sources, comprise at least two power supply units, this power supply unit provides a virtual impedance, the output impedance of this power supply unit when increasing parallel connection, make this power supply unit directly in parallel, to provide an ac output voltage and an ac output current, it is characterized in that any power supply unit comprises to a load:
One reference voltage generator provides a direct current reference voltage signal;
One voltage feedback controller, it is electrically connected this ac output voltage, feeding back this ac output voltage, and produces one and exchanges feedback voltage signal;
One string wave generator, it provides a string ripple signal;
One multiplier, it is electrically connected this reference voltage generator and this string wave generator, with this DC reference voltage signal and this string ripple signal multiplication, and produces one first alternating voltage command signal;
One current sensor, it is electrically connected this ac output current, detecting this ac output current, and produces an ac output current command signal;
One virtual impedance generator, it is electrically connected this current sensor, so that a virtual impedance to be provided, this virtual impedance and this ac output current command signal multiply each other, to produce one second alternating voltage command signal, this virtual impedance generator is to be used to provide this virtual impedance, increases the output impedance of this power supply unit;
One first subtracter, it is electrically connected this multiplier and this virtual impedance generator, so that this first alternating voltage command signal and this second alternating voltage command signal are subtracted each other, and produces one the 3rd alternating voltage command signal;
One second subtracter, it is electrically connected this first subtracter and this voltage feedback controller, the 3rd alternating voltage command signal is exchanged feedback voltage signal with this subtract each other, and produce one the 4th alternating voltage command signal;
One feedforward compensation device, it is electrically connected this first subtracter, so that the 3rd alternating voltage command signal compensation conversion is produced one first alternating current command signal;
One alternating voltage order compensator, it is electrically connected this second subtracter, produces one second alternating current command signal the 4th alternating voltage command signal is compensated conversion;
One adder, it is electrically connected this alternating voltage order compensator and this feedforward compensation device, so that this first alternating current command signal and this second alternating current command signal are synthesized generation one capacitance current command signal;
One alternating current calculates device, and it is electrically connected this voltage feedback controller, produces a capacitance current command signal so that this interchange feedback voltage signal is changed;
One the 3rd subtracter, it is electrically connected this adder and this alternating current and calculates device, so that this capacitance current command signal and this capacitance current command signal are subtracted each other, and produces one the 3rd alternating current command signal;
One alternating current order compensator, it is electrically connected the 3rd subtracter, so that the 3rd alternating current command signal is compensated, and produces one the 4th alternating current command signal;
One triggers drive signal generation circuit, and it is electrically connected this alternating current order compensator, triggers drive signal so that the conversion of the 4th alternating current command signal is produced one; And
One switches switching device, and it is electrically connected this a triggering drive signal generation circuit and an input power supply, and should import power supply switching output one ac output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02106082 CN1286240C (en) | 2002-04-10 | 2002-04-10 | Method and device for controlling parallel power sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02106082 CN1286240C (en) | 2002-04-10 | 2002-04-10 | Method and device for controlling parallel power sources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450705A true CN1450705A (en) | 2003-10-22 |
| CN1286240C CN1286240C (en) | 2006-11-22 |
Family
ID=28680149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02106082 Expired - Lifetime CN1286240C (en) | 2002-04-10 | 2002-04-10 | Method and device for controlling parallel power sources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1286240C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372205C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN100372204C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN100372206C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN102646976A (en) * | 2011-02-22 | 2012-08-22 | 台达电子工业股份有限公司 | Multiple-power-supply parallel feed system |
| CN103475246A (en) * | 2013-09-16 | 2013-12-25 | 佛山市新光宏锐电源设备有限公司 | Control method and control system of single-phase inverter |
| US9071079B2 (en) | 2011-02-22 | 2015-06-30 | Delta Electronics, Inc. | Power supply system with multiple power sources in parallel |
| CN108574302A (en) * | 2018-04-13 | 2018-09-25 | 燕山大学 | Grid-connected control method based on feedforward compensation and virtual impedance |
| CN108879782A (en) * | 2018-08-01 | 2018-11-23 | 国网重庆市电力公司电力科学研究院 | Gird-connected inverter optimal control method based on double-smoothing voltage feed-forward control |
-
2002
- 2002-04-10 CN CN 02106082 patent/CN1286240C/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372205C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN100372204C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN100372206C (en) * | 2004-08-18 | 2008-02-27 | 台达电子工业股份有限公司 | Master-slave current distributing circuit |
| CN104967110A (en) * | 2011-02-22 | 2015-10-07 | 台达电子工业股份有限公司 | Multi-power parallel supply system |
| US9071079B2 (en) | 2011-02-22 | 2015-06-30 | Delta Electronics, Inc. | Power supply system with multiple power sources in parallel |
| CN102646976A (en) * | 2011-02-22 | 2012-08-22 | 台达电子工业股份有限公司 | Multiple-power-supply parallel feed system |
| CN104967110B (en) * | 2011-02-22 | 2018-03-23 | 台达电子工业股份有限公司 | More power sources in parallel electric power systems |
| CN103475246A (en) * | 2013-09-16 | 2013-12-25 | 佛山市新光宏锐电源设备有限公司 | Control method and control system of single-phase inverter |
| CN103475246B (en) * | 2013-09-16 | 2016-08-17 | 佛山市新光宏锐电源设备有限公司 | The control method of a kind of single-phase inverter and control system |
| CN108574302A (en) * | 2018-04-13 | 2018-09-25 | 燕山大学 | Grid-connected control method based on feedforward compensation and virtual impedance |
| CN108574302B (en) * | 2018-04-13 | 2021-05-28 | 燕山大学 | Grid-connected control method based on feedforward compensation and virtual impedance |
| CN108879782A (en) * | 2018-08-01 | 2018-11-23 | 国网重庆市电力公司电力科学研究院 | Gird-connected inverter optimal control method based on double-smoothing voltage feed-forward control |
| CN108879782B (en) * | 2018-08-01 | 2021-11-30 | 国网重庆市电力公司电力科学研究院 | Grid-connected inverter optimization control method based on dual-filtering power grid voltage feedforward |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1286240C (en) | 2006-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1144349C (en) | Mains connection set | |
| CN1041679C (en) | Induction motor control apparatus providing high efficiency with rapid response to changes in load torque | |
| CN101814825B (en) | Linear-regulated PFC (Power Factor Correction) control circuit and control method | |
| CN200956303Y (en) | Contactless stepless on-load voltage-regulating transformer | |
| CN106329969B (en) | Output voltage dynamic response optimal control suitable for Vienna rectifiers | |
| CN1847865A (en) | Energy feedback type AC/DC electronic load simulator | |
| CN1286240C (en) | Method and device for controlling parallel power sources | |
| CN110198130A (en) | More vector optimization control systems and method under the conditions of a kind of unbalanced power grid | |
| CN1812234A (en) | Method for controlling power-factor correct circuit | |
| RU2354025C1 (en) | Method for high harmonics compensation and system power factor correction | |
| CN1658485A (en) | Counter control current tracking control method based on average current compensation | |
| CN2791657Y (en) | Electric load general simulation device | |
| RU2413350C1 (en) | Method to compensate high harmonics and correction of grid power ratio | |
| CN1603849A (en) | General simulator for electrical load | |
| CN1489271A (en) | Electronic stepless regulating AC voltage-regulating and stabilizing apparatus | |
| CN107634657B (en) | Predictive control method and device for matrix converter | |
| CN111342480B (en) | Three-phase line mutual feedback power balance control method | |
| CN1452806A (en) | Active power factor correction | |
| CN1564415A (en) | Unified constant frequency integral controlled 3-phase 4-line active power filter control method | |
| Kantaria et al. | A novel hysteresis control technique of VSI based STATCOM | |
| CN1960108A (en) | Active mode adjustment device for AC load characteristic | |
| CN1086615A (en) | Be applicable to the module parallel power factor correcting method and the device of arbitrary load | |
| Pahlevaninezhad et al. | An optimal Lyapunov-based control strategy for power factor correction AC/DC converters applicable to electric vehicles | |
| Praba et al. | Design and implementation of bridgeless AC/DC PFC sepic converter with valley-fill circuit | |
| CN2834002Y (en) | Improved passive electric power filter circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061122 |
|
| CX01 | Expiry of patent term |