CN103904654A - Combined three-phase inverter circuit parallel operation control method - Google Patents

Combined three-phase inverter circuit parallel operation control method Download PDF

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CN103904654A
CN103904654A CN201410086865.4A CN201410086865A CN103904654A CN 103904654 A CN103904654 A CN 103904654A CN 201410086865 A CN201410086865 A CN 201410086865A CN 103904654 A CN103904654 A CN 103904654A
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inverter
power
voltage
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CN103904654B (en
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任碧莹
白恒
孙向东
张琦
安少亮
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Xian University of Technology
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Abstract

The invention discloses a combined three-phase inverter circuit parallel operation control method. Three-phase voltages and current signals output by an inverter are sampled and are then processed through an average power calculation module to obtain average active power and average reactive power output by the inverter. Power information of the inverter is imported into a droop controller to obtain a reference signal of the three-phase voltages output by the inverter, the reference signal is compared with a phase voltage output by the inverter and subtracted from the phase voltage, then the voltage error is output, a current reference signal is output after an error signal is regulated by a voltage regulator, the reference signal is subtracted from a current output by the inverter, then the current error is output, the error signal is processed by a current controller, a modulation signal is output and processed through a modulation module, and finally a switch control signal is output. The method achieves symmetry of voltages output by an inverter under the three-phase unbalanced load condition.

Description

Three-phase combined inverter bridge circuit parallel Operation Control method
Technical field
The invention belongs to micro-electrical network from distributed power source technical field of power generation under net pattern, relate to a kind of three-phase combined inverter bridge circuit parallel Operation Control method.
Background technology
The today going from bad to worse at energy scarcity and environment, the micro-grid system forming based on distributed power generation more and more receives publicity.Become one of target of national energy-saving reduction of discharging, strategic planning for sustainable development due to its outstanding feature.Power supply in micro-electrical network mostly is micro-power supply, contains the small unit of power electronics interface inversion grid connection, and it comprises the energy storage devices such as gas turbine, fuel cell, photovoltaic cell, wind power generation and super capacitor, storage battery.They are connected on user's side, have the features such as low cost, low-voltage, low pollution.Micro-electrical network both can with the operation of large grid network, also can or need at electric network fault time, carry out from network operation separately with major network disconnection.
Micro-electrical network is during from network operation, multiple micro-power-supply controller of electric parallel running based on inverter, and each micro-power acquisition droop characteristic control, realizes distributed power source sharing load power.Droop control is a kind of inverter control mode based on reciprocity control thought, and each inverter is only realized load sharing according to local information, and can suppress circulation and produce, control simple, between inverter without communication.
Droop control is studied for three-phase balancing load or single-phase load substantially at present, but under low pressure microgrid, public exchange bus adopts three-phase four-wire system, and load exists uneven situation often.When adopting conventional droop control, and three single-phase between independent control, if threephase load imbalance, so under this control method, voltage reference signal frequency and the amplitude of the output of three single-phase inverters will produce deviation, and this deviation finally causes in load three-phase voltage amplitude and phase place all asymmetric.
Three-phase four-wire system multi-inverter parallel based on droop control is in service, and how controlling the symmetry of inverter output voltage under three-phase imbalance load is a difficult point, and it is necessary therefore adopting suitable topological circuit and control method reasonable in design.Based on this, employing Combined three phase inversion topological circuit and improved inversion parallel connection droop control method are proposed.
Summary of the invention
The object of this invention is to provide a kind of three-phase combined inverter bridge circuit parallel Operation Control method, solved prior art at micro-electrical network under network operation pattern, in the time that threephase load is uneven, can not ensure the symmetric problem of inverter output three-phase voltage.
The technical solution adopted in the present invention is, a kind of three-phase combined inverter bridge circuit parallel Operation Control method, and its control procedure is:
First, sampling inverter output three-phase voltage u xwith current signal i x, the computing of calculating module through average power, obtains respectively inverter output average active power P xand reactive power Q x, x is respectively a, b and c;
Then, by the power information P of inverter xand Q ximporting improves in droop control device, thereby obtains the reference signal u of inverter output three-phase voltage refx, this reference signal u refxwith inverter output phase voltage u xrelatively subtract each other rear output voltage error Δ ux, this error signal Δ uxregulate output current reference signal i through voltage regulator refx, this reference signal i refxwith inverter output current i xrelatively subtract each other rear output current error delta i x, this error signal Δ i xprocess and export modulation signal through current controller, this modulation signal is processed final output switch control signal through modulation module.
The invention has the beneficial effects as follows, for three-phase combined inverter bridge circuit structure, adopt improved droop control outer shroud to coordinate ring in electric current and voltage, both ensured in low pressure microgrid the symmetry of each phase inverter output voltage under three-phase imbalance load, realized again many three-phase inverters time in parallel load power automatically divide equally.Be applied to and in the micro-electrical network of low pressure, ensure in microgrid that single-phase load or three-phase imbalance load all can normally work, can stable operation while making micro-electrical network from net.
Brief description of the drawings
Fig. 1 is the three-phase combined inverter bridge circuit block diagram that the inventive method relies on;
Fig. 2 is the control principle block diagram of the inventive method;
Fig. 3 be the inventive method in improved droop control principle, each phase frequency-active power droop control schematic diagram;
Fig. 4 be the inventive method in improved droop control principle, each phase voltage amplitude-reactive power droop control schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Three-phase combined inverter bridge circuit is the typical forms of three-phase inverting circuit, and its version can simply be equivalent to three single-phase full-bridge inverter parallel connections, each separate between single-phase, have control simple, can connect the advantages such as unbalanced load.
The present invention adopts three-phase combined inverter bridge circuit, a kind of improved droop control method is proposed, adopt three-phase combined inverter bridge circuit to carry out unit or multimachine band threephase load operation as main circuit, the control mode of every Three-Phase Inverter adopts three ring control modes of ring in droop control outer shroud, voltage-to-current control, and the principle of control procedure is:
Judge peak load phase according to the each power of output mutually of Three-Phase Inverter, this phase droop control adopts fixing sagging coefficient, the voltage that other two-phases are exported mutually according to peak load and frequency be as self output voltage and frequency, and then adjust in real time the sagging coefficient of each phase; Under the sagging coefficient of other two-phases after adjusting, change each output mutually according to sagging principle and gain merit and reactive power, the voltage magnitude of other two-phases and frequency are consistent with peak load phase frequency, amplitude, realize the symmetry of inverter output three-phase voltage.
Whether balance of each phase load adopts above-mentioned droop control mode, no matter can realize inverter output three-phase voltage strictly symmetrical, and can ensure that each phase inverter power output can not exceed inverter rated capacity.In addition when the parallel running of many this Three-Phase Inverter power supplys, automatically divide equally according to inverter capacity if adopt this droop control can also realize load power.
Voltage loop can adopt conventional proportional plus integral control, ratio resonance (PR) to control or repeat and control, and electric current loop can adoption rate control.
Fig. 1 is the three-phase combined inverter bridge circuit block diagram that the inventive method relies on, and in Fig. 1, U, V, W, N represent respectively the output line of the three-phase and four-line way of output, and N is center line; E represents DC voltage; L xwith C x(x is a, b, c) correspondence forms filter; X x(x is a, b, c, N) represents the impedance between inverter and common bus; Tetra-switch composition a phase full-bridge inverter circuit of Sa1～Sa4, tetra-switch composition b phase full-bridge inverter circuit of Sb1～Sb4, tetra-switch composition c phase full-bridge inverter circuit of Sc1～Sc4, are three single-phase full-bridge inverter circuit altogether;
Above-mentioned three single-phase full-bridge inverter circuit parallel connection, three single-phase full-bridge inverter circuit input ends (left end) are all connected with DC side, DC side can be the DC power supply such as photovoltaic array, wind power generation, three single-phase full-bridge inverter circuit output ends (right-hand member) L that respectively hangs oneself xand C x(x=a, b, c) after the filter circuit of composition, export according to three-phase and four-line through transformer again, each through X xafter (x=a, b, c, N) line impedance, be connected with low voltage three-phase four-wire system electrical network; Each single-phase load or threephase load are connected on public exchange bus, the mode such as that load is is resistive, perceptual, capacitive or nonlinear load.
The Overall Steps of the corresponding the inventive method of Fig. 2, " improving droop control device " is only a part for whole control mode in Fig. 2, but only have the droop control of improvement part to belong to core of the present invention, the first half of the whole control procedure of the inventive method is only the control mode of improving droop control device in Fig. 2 in control procedure, said process latter half is for Voltage loop, electric current loop, several concrete control methods are only introduced, also be conventional basic skills, but also essential, belong to the present invention for the supporting control section of inverter topology.
With reference to Fig. 2, be the overall control block diagram of the inventive method, this control mode is one three ring control structure, its control procedure is:
First, sampling inverter output three-phase voltage u x(x is respectively a, b, c) and current signal i x(x is respectively a, b, c), calculates the computing of module through average power, obtains respectively inverter output average active power P x(x is respectively a, b, c) and reactive power Q x(x is respectively a, b, c);
Then, by the power information (P of inverter xand Q x) import in improvement droop control device of the present invention, thereby obtain the reference signal u of inverter output three-phase voltage refx, this reference signal u refxwith inverter output phase voltage u xrelatively subtract each other rear output voltage error Δ ux, this error signal Δ uxregulate output current reference signal i through voltage regulator refx, this reference signal i refxwith inverter output current i xrelatively subtract each other rear output current error delta i x, this error signal Δ i xprocess and export modulation signal through current controller, this modulation signal is processed final output switch control signal through modulation module.
Average power is calculated module: preset power calculation method, adopt sampled voltage and electric current to multiply each other and calculate inverter output average power through the method for low-pass filtering again, or adopt instantaneous power integration to be averaging power.
Voltage regulator: adopt one of independent pure ratio (P) controller, proportional integral (PI) controller, ratio resonance (PR) controller, accurate ratio resonant controller or repetitive controller, or the compound mode of several controllers wherein.
Current controller: adopt pure ratio control mode.
Modulation module: adopt sinusoidal pulse width modulation (SPWM) or other modulation systems.
With reference to Fig. 3, Fig. 4, it is the control principle schematic diagram of the improvement droop control device that proposes of the present invention.In Fig. 3, Fig. 4, f x(x is a, b, the frequency that c) is respectively inverter and respectively exports mutually phase voltage; f 0for the each phase idling frequency of inverter; f minfor the each low-limit frequency that allows mutually output of inverter; P x(x is a, b, c) is respectively the each phase power output of inverter; P maxfor the each maximum power that allows mutually output of inverter; Letter A, B, C represent respectively respectively mutually a certain moment working point of inverter, and A ', B ' are inverter a, the working point in an other moment of b two-phase; M is the each phase no-load running point of inverter; N is that the each phase maximum power of inverter allows point;
The droop control that is pure perception taking distribution wire is example, i.e. the meritorious corresponding output voltage frequency of inverter output, idle corresponding output voltage amplitude.If adopt traditional droop control mode, each phase frequency-active power droop control is all controlled according to the sagging curve shown in l1 in Fig. 3, and its governing equation is suc as formula (1):
f x = f 0 - m x · P x m x = f 0 - f min P max , - - - ( 1 )
In formula (1): f x(subscript x is a, b, the frequency that c) is respectively inverter and respectively exports mutually phase voltage; f 0for the each phase idling frequency of inverter; f minfor the each low-limit frequency that allows mutually output of inverter; m x(subscript x is a, b, c) is meritorious sagging coefficient, the i.e. slope absolute value of sagging curve; P x(subscript x is a, b, c) is respectively the each phase power output of inverter; P maxfor the each maximum active power that allows mutually output of inverter.
Each phase voltage amplitude-reactive power droop control is all according to l in Fig. 4 4shown sagging curve is controlled, and its governing equation is suc as formula (2):
V x = V 0 - n x · Q x n x = V 0 - V min Q max , - - - ( 2 )
In formula (2): V x(subscript x is a, b, the amplitude that c) is respectively inverter and respectively exports mutually phase voltage; V 0for the each phase floating voltage of inverter amplitude; n x(subscript x is a, b, c) for idle sagging coefficient, the i.e. slope absolute value of sagging curve; V minfor the each minimum voltage amplitude that allows mutually output of inverter; Q maxfor the each maximum reactive power that allows mutually output of inverter;
When inverter band three-phase imbalance load, as P in Fig. 3 a< P b< P c, must cause so the asymmetric (f of inverter output three-phase voltage frequency a< f b< f c).In like manner the sagging relation of idle-amplitude (Q-V) also there will be three-phase voltage amplitude asymmetric.So must cause that according to traditional approach inverter output three-phase voltage frequency is asymmetric and three-phase voltage amplitude is asymmetric.
Improving droop control method is by real-time judge peak load phase, makes peak load according to sagging curve control, and this adopts fixing sagging coefficient to control mutually, and this fixing sagging coefficient calculates according to formula (1) and formula (2).Other two-phases are adjusted the sagging coefficient of self in real time according to the output frequency of load maximal phase and voltage magnitude, according to l in Fig. 3 2(l 3), l 5(l 6) control.Detailed process is as follows:
Relatively three phase power Pa, Pb, Pc, ask maximum load power phase.Suppose current P a< P b< P c, obtain current maximum load power phase C phase output frequency f according to formula (3) c, and make the output frequency of other two-phase equal f c, i.e. f a=f b=f c, further obtain the sagging Coefficient m of a, b two-phase according to formula (3) aand m b.When a, b two-phase can guarantee that according to this sagging curve operation threephase load is uneven so, the active power of loading when three-phase output frequency equates and many three-phase inverters are in parallel is divided equally.
f c = f 0 - m c &CenterDot; P c m a = f 0 - f c P a m b = f 0 - f c P b , - - - ( 3 )
In like manner, the sagging relation of idle-amplitude (Q-V) also there will be three-phase voltage amplitude asymmetric.Relatively three phase power Q a, Q b, Q c, ask maximum load power phase.Suppose current Q a< Q b< Q c, obtain current C phase output voltage amplitude V according to formula (4) c, the output voltage amplitude of this seasonal other two-phase equals V c, i.e. V a=V b=V c, further according to formula (4) obtain a, b two-phase is idle-the sagging coefficient n of voltage aand n b.
V c = V 0 - n c &CenterDot; Q c n a = V 0 - V c Q a n b = V 0 - V c Q b , - - - ( 4 )
When a, b two-phase can guarantee that threephase load is asymmetric according to this sagging curve operation so, three-phase output voltage amplitude equates and reactive load power-sharing when multi-inverter parallel.
Formula (3) and formula (4) are the mathematical expressions of improving one's methods that the present invention " improves droop control device ", belong to the core algorithm of the present invention's innovation.
In sum, adopt improvement droop control method of the present invention, no matter whether load balancing can ensure the symmetry of inverter output three-phase voltage.In the time that many three-phase inverters are in parallel, adopt above-mentioned improvement droop control method under the prerequisite of guarantee inverter output voltage symmetry, can also realize load power and strictly divide equally according to inverter capacity.
Essential meaning of the present invention is, for micro-electrical network from inverter parallel off the net and in the time that threephase load is uneven, Three-Phase Inverter topological structure has been proposed, and its droop control ring is proposed to corresponding corrective measure, the frequency drawing in droop control according to the meritorious phase load of maximum and the voltage magnitude drawing in droop control according to the idle phase load of maximum are as benchmark, the sagging coefficient that other adjusts self mutually, is consistent three-phase voltage frequency and amplitude.Adopt this improvement droop control method under three-phrase burden balance and imbalance and single-phase load operating mode, to move, and under many three-phase inverters condition in parallel, realize load power and divide equally by inverter capacity.

Claims (4)

1. a three-phase combined inverter bridge circuit parallel Operation Control method, is characterized in that, its control procedure is:
First, sampling inverter output three-phase voltage u xwith current signal i x, the computing of calculating module through average power, obtains respectively inverter output average active power P xand reactive power Q x, x is respectively a, b and c;
Then, by the power information P of inverter xand Q ximporting improves in droop control device, thereby obtains the reference signal u of inverter output three-phase voltage refx, this reference signal u refxwith inverter output phase voltage u xrelatively subtract each other rear output voltage error Δ ux, this error signal Δ uxregulate output current reference signal i through voltage regulator refx, this reference signal i refxwith inverter output current i xrelatively subtract each other rear output current error delta i x, this error signal Δ i xprocess and export modulation signal through current controller, this modulation signal is processed final output switch control signal through modulation module.
2. three-phase combined inverter bridge circuit parallel Operation Control method according to claim 1, is characterized in that, the structure of described improvement droop control device is:
U, V, W, N represent respectively the output line of the three-phase and four-line way of output, and N is center line; E represents DC voltage; L xwith C xcorresponding composition filter; X xrepresent the impedance between inverter and common bus; Tetra-switch composition a phase full-bridge inverter circuit of Sa1～Sa4, tetra-switch composition b phase full-bridge inverter circuit of Sb1～Sb4, tetra-switch composition c phase full-bridge inverter circuit of Sc1～Sc4, are three single-phase full-bridge inverter circuit altogether; X is a, b, c or N;
Above-mentioned three single-phase full-bridge inverter circuit parallel connection, three single-phase full-bridge inverter circuit input ends are all connected with DC side, three single-phase full-bridge inverter circuit output ends L that respectively hangs oneself xand C xafter the filter circuit of composition, export according to three-phase and four-line through transformer again, each through X xafter line impedance, be connected with low voltage three-phase four-wire system electrical network; Each single-phase load or threephase load are connected on public exchange bus, the mode such as that load is is resistive, perceptual, capacitive or nonlinear load.
3. three-phase combined inverter bridge circuit parallel Operation Control method according to claim 1, it is characterized in that: described average power is calculated module: preset power calculation method, adopt sampled voltage and electric current to multiply each other and calculate inverter output average power through the method for low-pass filtering again, or adopt instantaneous power integration to be averaging power;
Voltage regulator: adopt one of independent pure proportional controller, pi controller, ratio resonant controller, accurate ratio resonant controller or repetitive controller, or the compound mode of several controllers wherein;
Current controller: adopt pure ratio control mode;
Modulation module: adopt sinusoidal pulse width modulation or other modulation systems.
4. three-phase combined inverter bridge circuit parallel Operation Control method according to claim 1, is characterized in that, the control procedure of described improvement droop control device is:
Relatively three phase power Pa, Pb, Pc, ask maximum load power phase, supposes current P a< P b< P c, obtain current maximum load power phase C phase output frequency f according to formula (3) c, and make the output frequency of other two-phase equal f c, i.e. f a=f b=f c, further obtain the sagging Coefficient m of a, b two-phase according to formula (3) aand m b,
f c = f 0 - m c &CenterDot; P c m a = f 0 - f c P a m b = f 0 - f c P b , - - - ( 3 )
A, b two-phase can be guaranteed in the time that threephase load is uneven according to this sagging curve operation so, and the active power of loading when three-phase output frequency equates and many three-phase inverters are in parallel is divided equally;
In like manner, the sagging relation of idle-amplitude Q-V also there will be three-phase voltage amplitude asymmetric, relatively three phase power Q a, Q b, Q c, ask maximum load power phase, suppose current Q a< Q b< Q c, obtain current C phase output voltage amplitude V according to formula (4) c, the output voltage amplitude of this seasonal other two-phase equals Vc, i.e. V a=V b=V c, further according to formula (4) obtain a, b two-phase is idle-the sagging coefficient n of voltage aand n b:
V c = V 0 - n c &CenterDot; Q c n a = V 0 - V c Q a n b = V 0 - V c Q b , - - - ( 4 )
A, b two-phase can guarantee in the time that threephase load is asymmetric according to this sagging curve operation so, and three-phase output voltage amplitude equates and reactive load power-sharing when multi-inverter parallel.
CN201410086865.4A 2014-03-11 2014-03-11 Three-phase combined inverter bridge circuit parallel Operation Control method Expired - Fee Related CN103904654B (en)

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CN104795826A (en) * 2015-04-15 2015-07-22 西安理工大学 Operation control method for combined three-phase inverter
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CN113650628A (en) * 2021-09-03 2021-11-16 西安中车永电电气有限公司 Intelligent tourism electric motor train unit traction auxiliary power supply system capable of dispersing power

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CN104092397B (en) * 2014-07-15 2016-06-15 安徽启光能源科技研究院有限公司 A kind of Three-loop control method of the full-bridge inverter under photovoltaic energy storage system island mode
CN104092397A (en) * 2014-07-15 2014-10-08 安徽启光能源科技研究院有限公司 Three-closed-loop control method for full bridge inverter in island mode of photovoltaic energy storage system
CN104795826A (en) * 2015-04-15 2015-07-22 西安理工大学 Operation control method for combined three-phase inverter
CN107017784B (en) * 2017-05-05 2023-11-10 艾普斯电源（苏州）有限公司 Power mode control method, control device and three-phase variable frequency power supply
CN107017784A (en) * 2017-05-05 2017-08-04 艾普斯电源（苏州）有限公司 A kind of electric source modes control method, control device and three phase frequency changing power
CN109728741A (en) * 2017-10-26 2019-05-07 财团法人工业技术研究院 Voltage balancing control method and device applied to three-phase DC-AC converter
CN109728741B (en) * 2017-10-26 2020-07-03 财团法人工业技术研究院 Voltage balance control method and device applied to three-phase DC-AC converter
US10840825B2 (en) 2017-10-26 2020-11-17 Industrial Technology Research Institute Voltage balance control method and device for three-phase DC-AC inverter
CN110198136A (en) * 2019-01-30 2019-09-03 哈尔滨理工大学 Combined type controls full bridge inverse conversion power
CN110460113A (en) * 2019-07-18 2019-11-15 河海大学 A kind of machinery inertial analogy method of inverter power supply
CN110460113B (en) * 2019-07-18 2022-08-19 河海大学 Mechanical inertia simulation method of inverter power supply
CN113452305A (en) * 2021-05-12 2021-09-28 武汉华海通用电气有限公司 Frequency conversion speed regulation device with asynchronous motor and multiple common bus three-phase inverters connected in parallel
CN113650628A (en) * 2021-09-03 2021-11-16 西安中车永电电气有限公司 Intelligent tourism electric motor train unit traction auxiliary power supply system capable of dispersing power

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