CN1286240C - Method and device for controlling parallel power sources - Google Patents
Method and device for controlling parallel power sources Download PDFInfo
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- CN1286240C CN1286240C CN 02106082 CN02106082A CN1286240C CN 1286240 C CN1286240 C CN 1286240C CN 02106082 CN02106082 CN 02106082 CN 02106082 A CN02106082 A CN 02106082A CN 1286240 C CN1286240 C CN 1286240C
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Abstract
The present invention provides a control method and a device of a parallel power supply. The parallel power supply comprises at least two power supplies, the control method provides virtual impedance for the power supply to increase the output impedance of the power supply when the power supply is connected in parallel so that the power supply can be directly connected in parallel without a connecting reactor, and each power supply is controlled to have the same real power output by regulating the output voltage reference value of the power supply.
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 desire to impel its steady running, 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 transmission and distribution networks 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 effective power output of every generator of Poi representative, the reactance capacity output of every generator of Qoi representative, δ
IRepresent 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 effective power output valve Poi is and this power angle δ
IRelevant, and this reactance capacity is defeated, and to be worth Qoi be relevant with this output voltage V oi, therefore desire is controlled this effective power output valve of every generator, can realize by an operating frequency value that changes this generator, this reactance capacity output valve of every generator of desire control, can utilize the output-voltage levels 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 a connection 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, an output impedance when increasing parallel connection, this parallel power sources can directly be connected in parallel, and need not to use a connection reactor, and control every power supply unit by the output voltage reference level of adjusting this power supply unit and have identical effective power output.
According to conception of the present invention, a kind of control method of parallel power sources is provided on the one hand, this parallel power sources comprises at least two power supply units, this control method provides virtual impedance of each power supply unit in this parallel power sources, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current to a load; It is characterized in that this control method of the arbitrary power supply unit in this parallel power sources 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 an effective power output and a reactance capacity 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.
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 transformation size and a phase place, by controlling this voltage swing controlling the output of this effective power, and by controlling this phase place to control the output of this reactance capacity.
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 effective power output.
According to a further aspect of the invention, a kind of parallel power sources is provided, comprise at least two power supply units, each power supply unit in this parallel power sources provides a virtual impedance, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current to a load, it is characterized in that, any one power supply unit in the parallel power sources comprises: a reference voltage generator provides a DC reference voltage signal; A voltage feedback controller, it is electrically connected this ac output voltage, feeds back this ac output voltage, exchanges feedback voltage signal to produce one; A rectifier filter, it is electrically connected this voltage feedback controller, should exchanging the feedback voltage signal rectifying and wave-filtering, and produces a DC 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; A direct voltage order compensator, it is electrically connected this first comparator, this first direct voltage command signal is compensated, to produce one second direct voltage command signal; A string wave generator, it provides a string ripple signal; A 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; A current sensor, it is electrically connected this ac output current, detecting this ac output current, and produces an ac output current command signal; A virtual impedance generator, it is electrically connected this current sensor, a 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; An 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 is triggered 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 a converting switch device, it is electrically connected this triggering drive signal generation circuit and an input power supply, switches ac output voltage of output should import power supply.
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 resistive impedance.
According to above-mentioned conception, wherein this DC reference voltage signal is the effective 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 a reactance capacity 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 effective 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, comprise at least two power supply units, each power supply unit in this parallel power sources provides a virtual impedance, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current to a load, it is characterized in that, any one power supply unit in the parallel power sources comprises: a reference voltage generator provides a DC reference voltage signal; A 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; A string wave generator, it provides a string ripple signal; A 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; A 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; A 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; An 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; An 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 one first capacitance current command signal of generation; An alternating current calculates device, and it is electrically connected this voltage feedback controller, produces one second 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 first capacitance current command signal and this second capacitance current command signal are subtracted each other, and produces one the 3rd alternating current command signal; An 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 is triggered 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 a converting switch device, it is electrically connected this triggering drive signal generation circuit and an input power supply, and should import ac output voltage of power supply switching output.
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 effective power-dropping voltage characteristic of the present invention and reactance capacity-frequency falling characteristic.
Fig. 3 is the circuit diagram of the power supply unit with virtual resistance characteristic of the present invention's first preferred embodiment.
Fig. 4 is the circuit diagram of the power supply unit with virtual resistance characteristic of the present invention's second preferred embodiment.
(5) embodiment
Seeing also Fig. 1 (a) ~ (b), is the circuit diagram with parallel power sources of 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, and need not to add a connection reactor.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
ocosδ
i-V
o 2)/R (3)
Q
oi＝(V
oiV
o/R)sinδi (4)
Wherein, Poi is the effective power output of every power supply unit, Qoi is the reactance capacity output of every power supply unit, 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 effective power output valve Poi is relevant with this output voltage V oi, and this reactance capacity output valve Qoi is relevant with this power angle δ i, therefore this effective power output valve of every power supply unit of desire control can be finished by the output voltage reference level of adjusting this power supply unit, and this reactance capacity 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 effective power-dropping voltage characteristic of the present invention (P-V droopcharacteristics) and reactance capacity-frequency falling characteristic (Q-f droopcharacteristics).Be depicted as the schematic diagram of effective 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), are respectively m1, m2 at this mi shown in Fig. 2 (a).And should determine its size by a predefined virtual resistance R by decline Coefficient m i.This effective 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 reactance capacity of the present invention-frequency falling characteristic.This reactance capacity output of old friend Qoi then can reach by an operating frequency value fi who adjusts this power supply unit, and this k is respectively k1, k2 in Fig. 2 (b).
See also Fig. 3, Fig. 3 is the circuit diagram of the power supply unit with virtual impedance characteristic of the present invention's first preferred embodiment.A power supply unit comprises: reference voltage generator 3, voltage feedback controller 4, rectifier filter 5, one first comparator 6, direct voltage order compensator 7, string wave generator 8, multiplier 9, current sensor 10, virtual impedance generator 11, one first subtracter 12, one second subtracter 13, alternating voltage order compensator 14, one trigger drive signal generation circuit 15, a converting switch device 16.This reference voltage generator 3 provides a DC 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 DC 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 triggering drive signal generation circuit 15 and an input power supply (not shown), switches ac output voltage Vo of output 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, this is exported electric Vo filtering.
Yet this rectifier filter can be a peak value counting circuit or a root-mean-square value counting circuit.
By adjusting the effective power output size that this DC reference voltage signal V*oset can control this power supply unit, make this power supply unit have identical effective power output.And can control the reactance capacity 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.A power supply unit comprises: a reference voltage takes place 17, a voltage feedback controller 18, a string wave generator 19, a multiplier 20, a current sensor 21, a virtual impedance generator 22, one first subtracter 23, one second subtracter 24, a feedforward compensation device 25, an alternating voltage order compensator 26, an adder 27, an alternating current calculates device 28, one the 3rd subtracter 29, an alternating current order compensator 30, one is triggered drive signal generation circuit 31 and a converting switch device 32.This reference voltage generator 17 provides a DC 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 first 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 one second 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 first capacitance current command signal ic* and this second 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 triggering drive signal generation circuit 31 and an input power supply (not being shown on the figure), switches ac output voltage of output 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 (13)
1. the control method of a parallel power sources, this parallel power sources comprises at least two power supply units, this control method provides virtual impedance of each power supply unit in this parallel power sources, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current to a load; It is characterized in that this control method of the arbitrary power supply unit in this parallel power sources 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 an effective power output and a reactance capacity 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 is characterized in that, this virtual impedance is a resistive impedance.
3. the control method of parallel power sources as claimed in claim 2, it is characterized in that, this first alternating voltage command signal comprises a voltage swing and a phase place, by controlling this voltage swing controlling the output of this effective power, and by controlling this phase place to control the output of this reactance capacity.
4. the control method of parallel power sources as claimed in claim 3, it is characterized in that, the voltage swing that also comprises this first alternating voltage command signal of each power supply unit of controlling respectively in this parallel power sources is so that this parallel power sources has identical effective power output.
5. parallel power sources, comprise at least two power supply units, each power supply unit in this parallel power sources provides a virtual impedance, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current, it is characterized in that any one power supply unit in the parallel power sources comprises to a load:
A reference voltage generator provides a DC reference voltage signal;
A voltage feedback controller, it is electrically connected this ac output voltage, feeds back this ac output voltage, exchanges feedback voltage signal to produce one;
A rectifier filter, it is electrically connected this voltage feedback controller, should exchanging the feedback voltage signal rectifying and wave-filtering, and produces a DC 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;
A direct voltage order compensator, it is electrically connected this first comparator, this first direct voltage command signal is compensated, to produce one second direct voltage command signal;
A string wave generator, it provides a string ripple signal;
A 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;
A current sensor, it is electrically connected this ac output current, detecting this ac output current, and produces an ac output current command signal;
A virtual impedance generator, it is electrically connected this current sensor, a 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;
An 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 is triggered 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
A converting switch device, it is electrically connected this triggering drive signal generation circuit and an input power supply, switches ac output voltage of output should import power supply.
6. parallel power sources as claimed in claim 5 is characterized in that, this virtual impedance is a resistive impedance.
7. parallel power sources as claimed in claim 6 is characterized in that, this DC reference voltage signal is an effective power output size that is used to control this power supply unit.
8. parallel power sources as claimed in claim 6 is characterized in that, the phase value of this string ripple signal is the reactance capacity output size that is used to control this power supply unit.
9. parallel power sources as claimed in claim 7 is characterized in that, controls the size of this DC reference voltage signal, makes each power supply unit in this parallel power sources have this identical effective power output.
10. parallel power sources as claimed in claim 5 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.
11. parallel power sources as claimed in claim 5 is characterized in that, this rectifier filter is a peak value counting circuit.
12. parallel power sources as claimed in claim 5 is characterized in that, this rectifier filter is a root-mean-square value counting circuit.
13. parallel power sources, comprise at least two power supply units, each power supply unit in this parallel power sources provides a virtual impedance, the numerical value of setting this virtual impedance is greater than the original output impedance of this power supply unit itself, make this virtual impedance become the main output impedance of this power supply unit, to provide an ac output voltage and an ac output current to a load, it is characterized in that any one power supply unit in the parallel power sources comprises:
A reference voltage generator provides a DC reference voltage signal;
A 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;
A string wave generator, it provides a string ripple signal;
A 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;
A 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;
A 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;
An 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;
An 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 one first capacitance current command signal of generation;
An alternating current calculates device, and it is electrically connected this voltage feedback controller, produces one second 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 first capacitance current command signal and this second capacitance current command signal are subtracted each other, and produces one the 3rd alternating current command signal;
An 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 is triggered 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
A converting switch device, it is electrically connected this triggering drive signal generation circuit and an input power supply, and should import ac output voltage of power supply switching output.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| TWI429162B (en) | 2011-02-22 | 2014-03-01 | Delta Electronics Inc | A power supply system with multiple power sources in parallel |
| 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 |
| CN108574302B (en) * | 2018-04-13 | 2021-05-28 | 燕山大学 | Grid-connected control method based on feedforward compensation and virtual impedance |
| 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 |
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2002
- 2002-04-10 CN CN 02106082 patent/CN1286240C/en not_active Expired - Lifetime
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| CN1450705A (en) | 2003-10-22 |
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