CN1312820C - Parallel single-phase DC-to-AC converter systems - Google Patents
Parallel single-phase DC-to-AC converter systems Download PDFInfo
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- CN1312820C CN1312820C CNB021350019A CN02135001A CN1312820C CN 1312820 C CN1312820 C CN 1312820C CN B021350019 A CNB021350019 A CN B021350019A CN 02135001 A CN02135001 A CN 02135001A CN 1312820 C CN1312820 C CN 1312820C
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Abstract
The present invention relates to a single-phase parallel inverter system. Aiming at the defect that the existing single-phase parallel inverter system can not directly carry out feedback control by the instantaneous power component of the circulating current, a circulating current decomposition device in the system is corrected. The present invention comprises a phase separation device for carrying out phase separation to the single phase circulating current Ic to obtain an orthogonal two-phase or symmetric three-phase virtual current signal, and a coordinate conversion device for carrying out d-q conversion to the orthogonal two-phase or symmetric three-phase virtual current signal to obtain a first correction signal corresponding to a frequency control signal and a second correction signal corresponding to an amplitude value control signal. The present invention obtains instantaneous active and reactive component of the circulating current from the single phase circulating current Ic. The present invention can maintain the load equipartition of each inverter module, even if the system is in instantaneous state, for example, a load jumps. Consequently, each inverter module can work stably.
Description
Technical field
The present invention relates to a kind of inverter system of forming by the single-phase inversion module of a plurality of parallel operations.
Background technology
Under the situation of using the inverter powering load, when the load desired volume is that single inverter module can not ensure, or need to strengthen when reliability, need to use a plurality of modules composition parallelly connected reverse converter systems come work.For system is had and the corresponding capacity of number of modules in parallel, require each inverter to bear load current (abbreviation current-sharing) equably, only just to reduce as far as possible between each inverter and flow, and not flow through the circulation of load.
In order to realize current-sharing, can adopt impedance droop method, centralized control (control of parallel operation plate) method, principal and subordinate to control methods such as method and common-battery throttle regulator.Wherein, the efficient of impedance method is low, characteristic is poor; And centralized control method and principal and subordinate's control method have reasons such as fault bottleneck, so all seldom use now.Relatively more commonly used is common-battery throttle regulator method, and its method is that inputing or outputing with holding wire of current regulator is communicated with, and to reach the purpose of current-sharing, generally is used for analogue system.The common feature of common-battery throttle regulator method is can be consistent substantially with the electric current that guarantees each inverter by the given of common current ring.Because each inversion module has discreteness, output voltage amplitude and phase place still may have small difference, because the output impedance of inverter is very little, minute differences also can cause bigger circulation.
For a plurality of three-phase inverter module parallel connections, enough little for guaranteeing each module circulation, introduce the circulation FEEDBACK CONTROL, in Chinese patent ' inverter system ' (patent No. is a Granted publication on January 5th, 92102212.3,1994), disclose the device that adopts this control.Its operation principle as shown in Figure 1, the inverter module of two parallel connections has only drawn among the figure.Be example with inverter module 1 below, operation principle is described.Wherein, detect the electric current I of the three-phase output of this module by current sensing means
Oa, I
Ob, I
Oc(brief note is I
o, as follows), calculate I by the circulation checkout gear again
oModule three-phase average output current I in parallel with all
aPoor, be the three phase circulation I of this inverter module
c, this is the alternating signal under the three phase static coordinate system, inconvenience is directly used in FEEDBACK CONTROL, adopts the d-q coordinate transform for this reason, and they are delivered to circulation decomposer (while three-phase output voltage V
oAlso be sent to decomposer, produce and decompose necessary synchronizing signal), be transformed into the direct current signal I under the rotating coordinate system
Cd, I
Cq, so that control also is easy to the control effect that obtains.I
CdBe the instantaneous real component of circulation ,-I
CqInstantaneous reactive component for circulation.With I
Cd, I
CqBe feedback quantity, make these two signals enough little (hope is zero) just can reach the purpose of current-sharing by control.Because the two is enough little, just mean that also circulation is enough little.
Said method is used for the current-sharing of three-phase module, and is very effective.Yet in single-phase alternating current, circulation is single-phase, only knows the instantaneous value of voltage and current, can't obtain the instantaneous power component of circulation, and directly doing FEEDBACK CONTROL with circulation has following shortcoming: 1) circulation is alternating quantity, is not easy the control effect that reaches good; 2) can only adopt conventional method, need a power frequency period just can detect meritorious, idle component, the dynamic characteristic of current-sharing is poor.
Summary of the invention
The technical problem to be solved in the present invention is, above-mentioned defective at prior art, a kind of parallel single-phase DC-to-AC converter systems is provided, even when making this system in instantaneous state, as load changing, also can keep impartial distribution of load of each inverter module, thereby each inverter module can stably be worked.
The scheme that the present invention solves its technical problem is, a kind of parallel single-phase DC-to-AC converter systems is provided, and has the inverter module of two parallel connections in the described system at least, comprises inverter main circuit and control circuit in each inverter module, and described control circuit comprises:
Be used to detect the output circulation I of described converter main circuit
cThe circulation checkout gear;
According to described circulation I
cGeneration is corresponding to first correction signal of frequency control signal and corresponding to the circulation decomposer of second correction signal of amplitude control signal;
Produce the frequency control apparatus of the frequency control signal of output voltage according to described first correction signal;
Produce the amplitude control device of output voltage amplitude control signal according to described second correction signal;
According to described amplitude control signal and frequency control signal, produce the control signal generator of the control signal be used to control described inverter main circuit;
It is characterized in that described circulation decomposer comprises:
Be used for described single-phase circulation I
cCarry out phase-splitting, obtain the neutral section of the different virtual current signal of at least two phase places; And,
Be used for described virtual current signal is carried out the conversion of d-q axle orthogonal coordinate system, obtain the coordinate transformation device of described first correction signal and second correction signal.
Wherein, described neutral section can adopt delay circuit or integrating circuit with described single-phase circulation I
cCarry out obtaining quadrature two-phase virtual current signal after phase-splitting is handled, or adopt delay circuit described single-phase circulation I
cCarry out obtaining symmetrical three-phase virtual current signal after phase-splitting is handled; And then described quadrature two-phase or symmetrical three-phase virtual current signal are carried out the d-q conversion by described coordinate transformation device, obtain the d-q component of circulation, i.e. I
CdAnd I
CqAvailable then I
CdAnd I
CqIn any as described first correction signal, another is then as the described second correction signal I
Cq
In parallel single-phase DC-to-AC converter systems of the present invention, described frequency control apparatus comprises: thus be used for described first correction signal carried out that P regulates or PI regulates the first adjuster G1 that obtains frequency correction amount Δ f, according to frequency correction amount Δ f to reference frequency f
oThe frequency correcting apparatus of proofreading and correct, and phase-locked loop 15.
In parallel single-phase DC-to-AC converter systems of the present invention, described amplitude control device comprises: thus be used for described second correction signal carried out that P regulates or PI regulates the second adjuster G2 that obtains amplitude rectification amount Δ v, according to amplitude rectification amount Δ v to reference amplitude V
rThe amplitude rectification device of proofreading and correct, and the amplitude compensation adjusting device G3 that the amplitude after proofreading and correct is carried out P adjusting or PI adjusting.
The present invention is single-phase circulation signal I
cSend into neutral section, become the virtual multiphase current signal that has two-phase or three-phase at least, and then use coordinate transformation device, get the meritorious and idle component of circulation, thereby be convenient to control, even when making system, also can keep impartial distribution of load of each inverter module, thereby each inverter module can stably be worked in instantaneous state, as load changing.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the flow equalize technology principle schematic of existing parallel three phase inverter system, can be used as the current-sharing principle schematic of single-phase inverter parallel system of the present invention simultaneously;
Fig. 2 is the schematic diagram of quadrature two-phase type phase-splitting in the single-phase inverter parallel system of the present invention;
Fig. 3 is the schematic diagram of three-phase symmetrical expression phase-splitting in the single-phase inverter parallel system of the present invention.
Embodiment
Operation principle of the present invention is still by Fig. 1 explanation, but the I among the figure
o, I
a, I
c, V
oNo longer be three-phase signal, but single-phase signal.Be example with single-phase inversion module 1 below, operation principle be described, as can be seen from the figure, comprise in the single-phase inversion module 1:
The frequency control apparatus of being formed by the first adjuster G1, frequency correcting apparatus 14 and phase-locked loop 15; The amplitude control device of forming by the second adjuster G2, amplitude rectification device 11 and amplitude compensation adjusting device G3; Converter main circuit 13; Circulation decomposer 18 and circulation checkout gear 19.Wherein, the control signal generator is contained in the converter main circuit 13, does not draw in Fig. 1.
During work, detect I by circulation checkout gear 19
oModule average output current I in parallel with all
aPoor, be the circulation I of this module
c=I
o-I
aCirculation I
cBe the alternating signal under the rest frame, it is admitted to circulation decomposer 18, gets the d-q component I of circulation
Cd, I
Cq(the V of this module
oAlso be sent to circulation decomposer 18, be used for producing the necessary sine of decomposition, cosine synchronizing datum signal).I
CdBe the instantaneous real component of circulation ,-I
CqInstantaneous reactive component for circulation.In the present embodiment with I
CdAs first correction signal, this signal obtains frequency correction amount Δ f behind the first adjuster G1; I
CqBehind the second adjuster G2, obtain amplitude rectification amount Δ v as second correction signal.The first adjuster G1, the second adjuster G2 can be P (ratio) adjuster, also can be PI (proportional integral) adjuster.Frequency correction amount Δ f is input to frequency correcting apparatus 14, to reference frequency f
oProofread and correct, its result outputs to phase-locked loop (PPL), obtains being used for the frequency control signal f of control inverter output voltage frequency at last
*, the phase place of its final decision module; Amplitude rectification amount Δ v input amplitude rectification device 11 is to reference amplitude V
rProofread and correct, its result outputs to amplitude compensation adjusting device G3, and G3 can be P (ratio) adjuster, also can be PI (proportional integral) adjuster, obtains being used for the amplitude control signal V of control inverter output voltage amplitude at last
*Frequency control signal f
*With amplitude control signal V
*Be imported into the control signal generator of inversion module, produce the switching device control signal of the switching device that is used for control inverter main circuit 13 again.
During concrete enforcement, also can be with I
CqBehind the first adjuster G1, obtain frequency correction amount Δ f as first correction signal; With I
CdObtain amplitude rectification amount Δ v as second correction signal behind the second adjuster G2, all the other processes remain unchanged.
Among the present invention, the circulation decomposer comprises neutral section and coordinate transformation device.Neutral section wherein is used for circulation I
cThe certain angle of phase shift gets current signal I
y, sometimes also circulation I
cAnother angle of phase shift gets current signal I
z, then I
cAs I
xAnd I
y(or together with I
z) send into coordinate transformation device together, the circulation of coordinate transformation device after phase-splitting transforms to two cordic phase rotators from rest frame, promptly carries out the d-q conversion, the d-q component I of circulation
Cd, I
CqDecompose about circulation, available below two class methods: (1), from single-phase signal I
cThe two-phase virtual current signal I that is orthogonal after the phase-splitting
x, I
y, what coordinate transformation device adopted is the conversion of two-phase static coordinate to two cordic phase rotators; (2), from single-phase signal I
cBecome the three-phase virtual current signal I of symmetry after the phase-splitting
x, I
y, I
z, what coordinate transformation device adopted is the conversion of three phase static coordinate to two cordic phase rotators.
The common feature of two class methods is: single-phase signal I
cFinally become the signal I of the rotating coordinate system of two-phase quadrature
Cd, I
Cq, concrete coordinate transformation method see the relevant books that alternating current machine learns (such as " automatic electric drive control system " by the Chen Baishi chief editor, China Machine Press published in 92 years, § 7-7, P242-247).
One, quadrature two-phase type phase-splitting
Neutral section is circulation I
cAs virtual current signal I
x, I
c90 ° of phase shifts or integration must with I
cThe virtual current signal I of quadrature
y
1, related method thereof
As shown in Figure 2, I wherein
yIt is the circulation instantaneous value before 1/4 cycle, consider the inversion output tracking bypass civil power of on line type UPS, reverse frequency can have among a small circle variation with civil power, a signal is arranged in program,, (for example be used to reflect the total sampling number of previous power frequency period for PWM (pulse-width modulation) warble rate m, sample frequency is 20kHz, local frequency is decided to be 50Hz, and then each power frequency period has 400 samplings, thus warble rate m=400).Therefore, I
yAvailable z map table is shown:
I
y(z)＝I
c(z)·z
-m/4
Be I
cGet I after postponing m/4 the sampling period (promptly 90 °)
y
2, integration method
For sinusoidal quantity, integration is equivalent to 90 ° of phase shifts, therefore available I
cIntegration obtains the I with its quadrature
y, that is:
Related method thereof need be opened up the FIFO that length is m/4 (first in first out) formation in order to realize time-delay in internal memory, be used to preserve current bat all circulation values to m/4 bat in the past.After sample frequency improved, m will scale up, can the too much committed memory variable space.And the employing integration, only many variablees, and integration has filter effect, helps anti-interference.
Two, three-phase symmetrical expression phase-splitting
Neutral section is circulation I
cAs virtual current signal I
x, obtain three virtual current signal I of 120 ° of mutual deviations by following method
x, I
y, I
z
1, I
xGet I after postponing m/3 the sampling period (promptly 120 °)
y, I
xGet I after postponing 2m/3 the sampling period (promptly 240 °)
z
I
y(z)＝I
x(z)·z
-m/3
I
z(z)＝I
x(z)·z
-2m/3
2, I
xGet I after postponing m/3 the sampling period (promptly 120 °)
yUtilize I
x+ I
y+ I
z=0 gets Iz
I
y(z)＝I
x(z)·z
-m/3
I
z(z)＝-I
x(z)·-I
y(z)
3, I
xAfter postponing m/6 the sampling period (promptly 60 °)-I
zUtilize I
x+ I
y+ I
z=0 gets Iy
I
z(z)＝-I
x(z)·z
-m/6
I
y(z)＝-I
x(z)·-I
z(z)。
Claims (8)
1, a kind of parallel single-phase DC-to-AC converter systems has the inverter module of two parallel connections at least in the described system, comprise inverter main circuit and control circuit in each inverter module, and described control circuit comprises:
Be used to detect the single-phase circulation (I of described converter main circuit
c) single-phase circulation checkout gear;
According to described single-phase circulation (I
c) generate corresponding to first correction signal of frequency control signal and corresponding to the single-phase circulation decomposer of second correction signal of amplitude control signal;
Produce the frequency control apparatus of the frequency control signal of output voltage according to described first correction signal;
Produce the amplitude control device of output voltage amplitude control signal according to described second correction signal;
According to described amplitude control signal and frequency control signal, produce the control signal generator of the control signal be used to control described inverter main circuit;
It is characterized in that described single-phase circulation decomposer comprises:
Be used for described single-phase circulation (I
c) carry out phase-splitting, obtain the neutral section of the different virtual current signal of at least two phase places; And,
Be used for described virtual current signal is carried out the conversion of d-q axle orthogonal coordinate system, obtain the coordinate transformation device of described first correction signal and second correction signal.
2, parallel single-phase DC-to-AC converter systems according to claim 1 is characterized in that, described neutral section is to described single-phase circulation (I
c) carry out the phase-splitting of quadrature two-phase type, obtain quadrature two-phase virtual current signal (I
x, I
y); Described coordinate transformation device carries out the d-q conversion to described quadrature two-phase virtual current signal, obtains described first correction signal and second correction signal.
3, parallel single-phase DC-to-AC converter systems according to claim 2 is characterized in that, described neutral section is with single-phase circulation (I
c) as virtual current signal (I
x), adopt delay circuit to described single-phase circulation (I
c) handle, obtain four/one-period single-phase circulation instantaneous value (I in the past
y).
4, parallel single-phase DC-to-AC converter systems according to claim 2 is characterized in that, described neutral section is with single-phase circulation (I
c) as virtual current signal (I
x), adopt integrating circuit to described single-phase circulation (I
c) handle, obtain the integration (I of single-phase circulation instantaneous value
y).
5, parallel single-phase DC-to-AC converter systems according to claim 1 is characterized in that, described neutral section is to described single-phase circulation (I
c) carry out the phase-splitting of three-phase symmetrical expression, obtain symmetrical three-phase virtual current signal (I
x, I
y, I
z); Described coordinate transformation device carries out the d-q conversion to described symmetrical three-phase virtual current signal, obtains described first correction signal and second correction signal.
6, parallel single-phase DC-to-AC converter systems according to claim 5 is characterized in that, described neutral section is with single-phase circulation (I
c) as virtual current signal (I
x), adopt delay circuit to described single-phase circulation (I
c) handle, obtain three/one-period single-phase circulation instantaneous value (I in the past
y) and three/two cycles single-phase circulation instantaneous value (I in the past
z).
7, according to each described parallel single-phase DC-to-AC converter systems among the claim 1-6, it is characterized in that, described frequency control apparatus comprises: thus be used for described first correction signal carried out that ratio is regulated or proportional integral is regulated first adjuster (G1) that obtains frequency correction amount (Δ f), according to frequency correction amount (Δ f) to reference frequency (f
o) frequency correcting apparatus (14) proofreaied and correct, and phase-locked loop (15).
8, according to each described parallel single-phase DC-to-AC converter systems among the claim 1-6, it is characterized in that, described amplitude control device comprises: thus be used for described second correction signal is carried out that ratio is regulated or proportional integral is regulated and obtained the amplitude rectification amount (Δ second adjuster (G2) v), (Δ is v) to reference amplitude (V according to the amplitude rectification amount
r) the amplitude rectification device (11) proofreaied and correct, and the amplitude after proofreading and correct carried out the amplitude compensation adjusting device (G3) that ratio is regulated or proportional integral is regulated.
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|---|---|---|---|
| CNB021350019A CN1312820C (en) | 2002-10-18 | 2002-10-18 | Parallel single-phase DC-to-AC converter systems |
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|---|---|---|---|
| CNB021350019A CN1312820C (en) | 2002-10-18 | 2002-10-18 | Parallel single-phase DC-to-AC converter systems |
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| CN1312820C true CN1312820C (en) | 2007-04-25 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100448134C (en) * | 2005-01-21 | 2008-12-31 | 广西新未来信息产业股份有限公司 | Parellel inversion power system for railway |
| CN101202453B (en) * | 2006-12-15 | 2010-09-01 | 中兴通讯股份有限公司 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
| CN101123352B (en) * | 2007-08-30 | 2010-09-29 | 中国科学院电工研究所 | Rear change converter of wind power generation system and its loop current control method |
| CN102244411B (en) * | 2010-05-11 | 2013-12-18 | 力博特公司 | UPS parallel machine system and parallel machine method thereof |
| CN102480246B (en) * | 2010-11-25 | 2014-12-31 | 比亚迪股份有限公司 | Vector control method and system of single-phase inverter as well as uninterruptible power supply |
| CN102255541B (en) * | 2011-07-19 | 2014-01-22 | 中国船舶重工集团公司第七一九研究所 | Single-phase inverter capable of performing instantaneous control under dq coordinate system and control method |
| CN102684313B (en) * | 2012-05-25 | 2015-03-04 | 许继电气股份有限公司 | Coordination control method of large-scale energy storage device |
| CN104467159B (en) * | 2013-09-22 | 2017-01-04 | 艾默生网络能源有限公司 | Determine the method for phase angle compensation amount, device, inverter and parallel UPS system |
| CN104410312A (en) * | 2014-11-26 | 2015-03-11 | 无锡上能新能源有限公司 | Paralleled current sharing control method of photovoltaic inverter |
| CN104967443B (en) * | 2015-06-08 | 2018-01-05 | 天津大学 | A kind of single phase frequency adaptive synchronicity phase-locked system with pre-flock wave energy |
| CN105425078B (en) * | 2015-12-12 | 2018-02-02 | 常州大学 | A kind of single-phase inverter auxiliary test unit |
| CN108011387B (en) * | 2017-12-05 | 2020-12-01 | 中国科学院广州能源研究所 | Voltage control method for energy storage converter in independent operation mode |
| CN109547016B (en) * | 2018-11-30 | 2022-10-28 | 中国科学院广州能源研究所 | Frequency self-adaptive single-phase-locked loop based on virtual three-phase algorithm |
| CN110768546B (en) * | 2019-10-31 | 2020-08-04 | 北京建筑大学 | Single-phase rectifier and control method thereof |
| CN111030285B (en) * | 2019-12-20 | 2021-11-05 | 漳州科华技术有限责任公司 | Uninterrupted power supply phase-locking implementation method and terminal equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1023437C (en) * | 1991-03-27 | 1994-01-05 | 株式会社东芝 | Inverter system |
| US5327336A (en) * | 1992-01-08 | 1994-07-05 | Fuji Electric Co., Ltd. | Constant voltage constant frequency inverter and method for controlling the same |
-
2002
- 2002-10-18 CN CNB021350019A patent/CN1312820C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1023437C (en) * | 1991-03-27 | 1994-01-05 | 株式会社东芝 | Inverter system |
| US5327336A (en) * | 1992-01-08 | 1994-07-05 | Fuji Electric Co., Ltd. | Constant voltage constant frequency inverter and method for controlling the same |
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