CN109494785A - The phase of no phase-locked loop tracks grid connection presynchronization control method certainly - Google Patents
The phase of no phase-locked loop tracks grid connection presynchronization control method certainly Download PDFInfo
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- CN109494785A CN109494785A CN201811266634.6A CN201811266634A CN109494785A CN 109494785 A CN109494785 A CN 109494785A CN 201811266634 A CN201811266634 A CN 201811266634A CN 109494785 A CN109494785 A CN 109494785A
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- presynchronization
- inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Abstract
The invention discloses a kind of phases of no phase-locked loop from tracking grid connection presynchronization control method, and step includes: that step 1) obtains the electrical angle θ of modulating wave by active power ring in virtual synchronous generator or sagging control；Step 2) compensates the electrical angle of modulating wave, gird-connected inverter output voltage phase, amplitude is adjusted in step 3), keep it identical as electric network voltage phase, amplitude, step 4) is closed three-phase grid contactor, step 5) disconnects phase, amplitude presynchronization controls the adjusting to gird-connected inverter,.Method of the invention, it is controlled using the phase of no phase-locked loop from grid connection presynchronization is tracked, it is that virtual synchronous generator or sagging control active power ring export phase angle theta by θ used in dq axis rotating coordinate system, locking phase is carried out to network voltage to eliminate, simplifies algorithm.
Description
Technical field
The invention belongs to grid connection presynchronization control technology field, the phase for being related to a kind of no phase-locked loop is grid-connected pre- same from tracking
Walk control method.
Background technique
In recent years, energy and environmental problem becomes the huge challenge that human social development faces, and new energy obtains widely
It uses, more and more distributed generation resources start to access power grid.These new energy access power grid by gird-connected inverter, in power grid
It, can be steadily to power grid transmission power in the normal situation of voltage.In electric network fault or power failure, inverter and power grid are disconnected
It opens, continues with independent operation mode as neighbouring critical load uninterrupted power supply, and can also grid-connected fortune again in power system restoration
Row.So grid-connected smoothly switch the research hotspot problem that technology is always distributed grid-connected inverter, and grid-connected smoothly switch skill
The key point of art is then phase presynchronization.Therefore, it continuously improves to phase pre-synchronization method, makes gird-connected inverter even running,
Guarantee its reliability, has a very important significance.
" the microgrid fortune based on virtual synchronous generator that " Automation of Electric Systems " is delivered in June, 2016 such as Shi Rongliang
Double PLL presynchronization control strategies are proposed in a row mode seamless switching control strategy " text, the strategy is by using two second orders
The phaselocked loop of Generalized Integrator respectively obtains the electrical angle of gird-connected inverter output voltage and network voltage, by the electricity of network voltage
As reference value, then the electrical angle of gird-connected inverter output voltage obtains simultaneously angle as value of feedback by integral controller
The compensation electrical angle of net inverter is compensated the output angular frequency of active ring.Overregulated gird-connected inverter output voltage
Electrical angle gird-connected inverter output voltage can be made consistent with the electrical angle of network voltage.The phase presynchronization control algolithm is multiple
It is miscellaneous, and the presynchronization time is longer.
" three-phase four-arm virtual synchronous generator is pre- same " electrotechnics journal " is delivered in July, 2017 by Gu Binshi etc.
It is proposed in a step, multi-loop control and laod unbalance control method " text and power grid is tracked using inverter end voltage-phase certainly
The presynchronization control method of voltage-phase.The control algolithm presynchronization time is short, but it needs to carry out locking phase to network voltage,
Increase the complexity of control algolithm.
Referring to Fig. 3, the presynchronization control method of inverter end voltage-phase from tracking electric network voltage phase was specifically controlled
Cheng Wei, network voltage uga、ugb、ugcNetwork voltage electrical angle θ is obtained by phase-locked loop pllg, inverter output voltage u latera、
ub、ucWith network voltage electrical angle θg3s/2r is inputted simultaneously to convert to obtain uq, ud.Then to output uqPI control is carried out, is finally made
uqIt is 0, contravarianter voltage phase can be made identical as electric network voltage phase.
Both the above method requires to carry out locking phase, therefore control algolithm to network voltage and gird-connected inverter output voltage
It is relatively cumbersome, increase system unstable factor.
Summary of the invention
The object of the present invention is to provide a kind of phases of no phase-locked loop from tracking grid connection presynchronization control method, solves inverse
When change device switches to grid-connected operating mode from off-network operating mode, inverter output voltage is inconsistent with electric network voltage phase, passes
The problem of control algolithm of uniting is relatively cumbersome, increases system unstable factor.
The technical scheme adopted by the invention is that a kind of phase of no phase-locked loop tracks grid connection presynchronization control method certainly,
It follows the steps below to implement:
Step 1) obtains the electrical angle θ of modulating wave by active power ring in virtual synchronous generator or sagging control；
Step 2) compensates the electrical angle of modulating wave；
Gird-connected inverter output voltage phase, amplitude is adjusted in step 3), makes itself and electric network voltage phase, amplitude phase
Together；
Step 4) is closed three-phase grid contactor；
Step 5) disconnects phase, amplitude presynchronization controls the adjusting to gird-connected inverter,.
The invention has the advantages that being realized simultaneously when grid connection presynchronization using the grid connection presynchronization technology of no phase-locked loop
Net inverter smoothly switches, and effectively simplifies phase presynchronization control algolithm, and it is available with conventional phase from chasing after
Track presynchronization controls identical control effect.
Detailed description of the invention
Fig. 1 is the hardware configuration embodiment schematic diagram that the method for the present invention is relied on；
Fig. 2 is the grid-connected timing diagram of the inverter in the method for the present invention；
Fig. 3 is conventional phase tracking grid connection presynchronization control block diagram certainly；
Fig. 4 is that the phase based on virtual synchronous generator control no phase-locked loop of the method for the present invention tracks grid connection presynchronization certainly
Control block diagram；
Fig. 5 is the voltage magnitude grid connection presynchronization control based on virtual synchronous generator control no phase-locked loop of the method for the present invention
Block diagram processed；
Fig. 6 is that the phase of the no phase-locked loop of the method for the present invention tracks grid connection presynchronization procedure chart certainly；
Fig. 7 is double PLL presynchronization control inverter output voltage angle, θs and line voltage angle θg；
Fig. 8 is conventional phase tracking presynchronization control inverter output voltage angle, θ and line voltage angle θ certainlyg；
Fig. 9 is that the phase of the no phase-locked loop of the method for the present invention controls inverter output voltage angle from tracking grid connection presynchronization
θ and line voltage angle θg；
Figure 10 is double PLL presynchronization control inverter output A phase voltage uaWith power grid A phase voltage uga；
Figure 11 is conventional phase tracking presynchronization control inverter output A phase voltage u certainlyaWith power grid A phase voltage uga；
Figure 12 is that the phase of the no phase-locked loop of the method for the present invention exports A phase voltage from tracking grid connection presynchronization control inverter
uaWith power grid A phase voltage uga；
Figure 13 is double PLL presynchronization control inverter output A phase voltage uaWith power grid A phase voltage ugaDifference；
Figure 14 is conventional phase tracking presynchronization control inverter output A phase voltage u certainlyaWith power grid A phase voltage ugaDifference；
Figure 15 is that the phase of the no phase-locked loop of the method for the present invention exports A phase voltage from tracking grid connection presynchronization control inverter
uaWith power grid A phase voltage ugaDifference；
Figure 16 is double PLL presynchronization control inverter output currents；
Figure 17 is conventional phase tracking presynchronization control inverter output current certainly；
Figure 18 is that the phase of the no phase-locked loop of the method for the present invention controls inverter output current from tracking grid connection presynchronization；
It is 100uF that Figure 19, which is capacitor, Phase delay figure when inductance changes；
Figure 20 is that inductance is 10mH, Phase delay figure when capacitance variations.
In figure, 10. DC power supplies, 20. power inverters, 30. inductance, 31. capacitors, 40. loads, 50. inductive currents biography
Sensor, 51. capacitance voltage sensors, 52. output current sensors, 60. three-phase grid contactors, the output of 61. grid connection presynchronizations
Voltage magnitude regulating switch, 62. grid connection presynchronization output voltage phase adjusteds switch, 70. power network line impedances, 71. three-phase electricities
Net, 80. the oneth 3s/2s conversion modules, 81. the 2nd 3s/2s conversion modules, 82. instantaneous power computing modules, 83. resultant vectors
Module, 90. voltage magnitude computing modules, 91. virtual governors, 100. virtual magnetizing exciters, 101. rotor mechanical equation modules,
102.LC filter phases compensating module, 110. synthesis three-phase voltages, the electrical equation module of 120. stators, 130. output voltage meters
Calculate module, 140. the 3rd 3s/2s conversion modules, 150. gird-connected inverter Voltage loop modules, 160. gird-connected inverter electric current ring moulds
Block, 170.2s/3s conversion module, 180.SPWM modulation module, 190. grid-connected smooth sliding control modules.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
When gird-connected inverter switches to grid-connected operating mode from off-network operating mode, existing presynchronization control method is required
Phaselocked loop is used to network voltage and gird-connected inverter output voltage, to obtain inverter output voltage electrical angle and network voltage
Electrical angle, therefore in grid connection presynchronization, the phase presynchronization of no phase-locked loop is designed to simplified control algorithm and increases system
Ballast is of great significance.In order to solve the problems, such as that the grid-connected phase presynchronization of tradition requires phaselocked loop, the present invention is proposed
The phase of following no phase-locked loop is from tracking grid connection presynchronization control method, wherein " 3s " in each conversion module represents three-phase
Rest frame, " 2s " represent two-phase stationary coordinate system, and " 2r " represents two-phase rotating coordinate system, "/" indicates coordinate transformation.
Referring to Fig.1, the gird-connected inverter structure based on virtual synchronous generator control that the method for the present invention is relied on is (i.e. hard
Part structure) it is that DC power supply 10 is connect (in inductance 30 i.e. Fig. 1 by power inverter 20 with the inductance 30 of three-phase LC filter
Three pole reactor Lf)；The inductive current sensor 50 of three-phase LC filter is also connected between inductance 30 and power inverter 20
(inductive current sensor 50 includes three current sensor i in Fig. 1La、iLb、iLc)；Inductance 30 passes through three-phase LC filter
Capacitor 31 and output current sensor 52 are correspondingly connected with (the three phase capacitance C in capacitor 31 i.e. Fig. 1f, the output packet of current sensor 52
Include three current sensor I in Fig. 1a、Ib、Ic), wherein the capacitor 31 of three-phase LC filter uses wye connection, and capacitor 31
(capacitance voltage sensor 51 includes three voltage sensors in Fig. 1 to the two capacitance voltage sensors 51 for being terminated with LC filter
ua、ub、uc)；Output current sensor 52 connect that (three-phase grid contactor 60 is i.e. with three-phase grid contactor 60 by load 40
Three-phase contactor PCC in Fig. 1), three-phase grid contactor 60 is connected (power grid by power network line impedance 70 with three phase network 71
Line impedance 70 includes the three-phase resistance R in Fig. 1g, three-phase reactor Lg)；
Instantaneous power of 51 output end of capacitance voltage sensor of LC filter simultaneously with gird-connected inverter output calculates mould
The input terminal of 82 input terminal of block and the 2nd 3s/2s conversion module 81 connection, output 52 output end of current sensor simultaneously with it is instantaneous
82 input terminal of power computation module is connected with 83 input terminal of resultant vector module of gird-connected inverter output electric current；
The output signal P of instantaneous power computing module 82eIt accesses in rotor mechanical equation module 101, instantaneous power calculates
The Feedback of Power input terminal of the output signal Q access of virtual magnetizing exciter 100 of module 82；
Two output signal u of the 2nd 3s/2s conversion module 81α、uβWith the voltage magnitude computing module 90 of inverter output
Input terminal connection, meanwhile, two output u of the 2nd 3s/2s conversion module 81α、uβSignal and gird-connected inverter Voltage loop module
The connection of 150 feedback ends；
The output signal u of the voltage magnitude computing module 90 of inverter outputmThe voltage magnitude of access of virtual magnetizing exciter 100
The amplitude of feedback end, grid connection presynchronization output voltage amplitude regulating switch 61 (i.e. KA in Fig. 1) and virtual magnetizing exciter 100 is pre- same
It walks compensating end to be connected, gird-connected inverter exports the output signal of the resultant vector module 83 of electric currentAccess the electrical equation mould of stator
120 input terminal of block；
The output signal P of virtual governor 91mAccess the power given side of rotor mechanical equation module 101, and rotor machine
(i.e. f in Fig. 1) takes back the frequency feedback of virtual governor 91 after signal ω in tool equation module 101 is multiplied with 1/2 π
End；The input terminal of the output signal θ access LC filter phases compensating module 102 of rotor mechanical equation module 101；
The output signal θ of LC filter phases compensating module 102IIt is accessed simultaneously with the output signal E of virtual magnetizing exciter 100
Synthesize the input terminal of three-phase voltage 110；Synthesize output signal (the i.e. E in Fig. 1 of three-phase voltage 110a、Eb、Ec) and stator it is electrical
Output signal (the i.e. Δ u in Fig. 1 of equation module 120a、Δub、Δuc) simultaneously access of virtual synchronous generator output voltage
The input terminal of computing module 130；
Output signal (the i.e. u in Fig. 1 of output voltage computing module 130a*、ub*、uc*) the 3rd 3s/2s of access converts mould
The input terminal of block 140；Output signal (the i.e. u in Fig. 1 of 3rd 3s/2s conversion module 140α*、uβ*) access grid-connected inverter electricity
The given side of pressure ring module 150；
Output signal (the i.e. i in Fig. 1 of gird-connected inverter Voltage loop module 150Lα*、iLβ*) access grid-connected inverter electricity
Flow the given side of ring moulds block 160；
Inductive current sensor 50 is connect with the input terminal of the first 3s/2s conversion module 80, the first 3s/2s conversion module 80
Output signal (i.e. i in Fig. 1Lα、iLβ) access grid-connected inverter electric current loop module 160 feedback end；
Output signal (the i.e. u in Fig. 1 of gird-connected inverter electric current loop module 160α1、uβ1) access 2s/3s conversion module
170 input terminal, the input of output signal (i.e. U in Fig. 1) the access SPWM modulation module 180 of 2s/3s conversion module 170
End, driving signal of the output signal of SPWM modulation module 180 as power inverter 20, control power device switch motion from
And realize transformation of electrical energy；
In addition three-phase grid contactor 60 is also connect with grid-connected smooth sliding control module 190, rotor mechanical equation module
101 output signal θ also access grid-connected smooth sliding control module 190, the output signal of grid-connected smooth sliding control module 190
△ ω passes through grid connection presynchronization output voltage phase adjusted switch 62 (i.e. being known as switch 2 in KB in Fig. 1, Fig. 2) access rotor
The feedback end of mechanical equation module 101.
Referring to Fig. 2, the phase of no phase-locked loop of the present invention is based on above-mentioned parallel network reverse from tracking grid connection presynchronization control method
The virtual synchronous generator hardware configuration of device, follows the steps below to implement:
Step 1) obtains the electrical angle θ of modulating wave by active power ring in virtual synchronous generator or sagging control；
Referring to Fig.1, grid connection presynchronization output voltage amplitude regulating switch 61 (in KA, Fig. 2 be known as switch 1) and it is grid-connected it is pre- together
Step output voltage phase adjusted switch 62 (being known as switch 2 in KB, Fig. 2) all closes at 0, i.e., to gird-connected inverter output voltage
Amplitude and phase all without adjusting, and three-phase grid contactor 60 (i.e. PCC in Fig. 1) is in an off state；It is grid-connected inverse
Become device and operate in island state, the active power ring of virtual synchronous generator or sagging control obtains voltage-phase θ, and unit is
Degree；
Step 2) compensates the electrical angle of modulating wave,
Due to the influence of LC filter, the electrical angle and virtual synchronous generator of inverter output voltage or sagging control are passed through
Crossing the electrical angle θ that active power ring obtains modulating wave has a fixed angle Δ θLC；Then by electrical angle θ and gird-connected inverter
The electrical angle Δ θ that filter phases move backLCAddition obtains θI, the as actual modulated wave electrical angle θ of gird-connected inverterI。
From Figure 19 and Figure 20 as it can be seen that working as inductance in 50% variation of rated value 10mH and capacitor 100 μ F's of rated value
Δ θ when 25% variationLCAmplitude of variation very little, so using fixed value to Δ θLCIt compensates, then gird-connected inverter exports at this time
The electrical angle of voltage is θ, unit ° (degree)；
Gird-connected inverter output voltage phase, amplitude is adjusted in step 3), makes itself and electric network voltage phase, amplitude phase
Together,
To realize that inverter smoothing is connected to the grid operation, it is necessary to make inverter output voltage and network voltage frequency, amplitude,
Phase is consistent, so grid-connected smooth sliding control includes that the control of voltage-phase presynchronization and amplitude presynchronization control two parts；When
When inverter prepares grid-connected, grid connection presynchronization output voltage amplitude regulating switch 61 (in KA, Fig. 2 be known as switch 1) and grid-connected pre-
Synchronism output voltage-phase regulating switch 62 (being known as switch 2 in KB, Fig. 2) is respectively closed at Δ u, Δ ω, that is, is started grid-connected
Smooth sliding control,
3.1) gird-connected inverter output voltage phase is adjusted, detailed process is,
Referring to Fig. 6, wherein virtual synchronous generator or the electrical angle of sagging control active power ring output are θ, with angle speed
ω rotation is spent, unit is radian per second (rad/s)；
At this point, network voltage ug, unit V (volt), phase θg, unit ° (degree), with angular velocity omegagRotation, unit rad/s
(radian per second)；
Inverter modulates wave voltage uM, unit V (volt), phase θM, unit ° (degree) rotates, unit with angular velocity omega
Rad/s (radian per second)；
Inverter output end voltage u, unit V (volt), phase θ, unit ° (degree) are rotated, unit rad/ with angular velocity omega
S (radian per second)；
Network voltage ugUnder virtual synchronous generator or the dq axis coordinate system of sagging control active power ring output θ rotation
Q axis component be ugq, unit V (volt)；
Network voltage ugUnder virtual synchronous generator or the dq axis coordinate system of sagging control active power ring output θ rotation
D axis component be ugd, unit V (volt)；
Referring to Fig.1, Fig. 4 and Fig. 6, as network voltage ugAnd holding equal with the angular speed of inverter output end voltage u is permanent
Periodically, an initial phase difference θ can be always existed between the twoerror；When inverter is switched to grid-connected mould from island mode preparation
When formula is run, grid connection presynchronization output voltage phase adjusted switch 62 (being known as switch 2 in KB, Fig. 2) is closed at Δ ω, is started
Frequency plot presynchronization, i.e., the angular velocity omega of adjustable inverter output voltage u, makes inverter output voltage u phase and power grid
Voltage ugIt is consistent with electric network voltage phase that inverter output voltage can be realized in phase coincidence.
By network voltage ug, unit V (volt), transform to virtual synchronous generator or sagging control active power ring output
θ, unit ° (degree), under the dq axis coordinate system of rotation, expression formula is as follows:
Wherein θerror, unit ° (degree) is grid voltage phase-angle and virtual synchronous generator or sagging control active power ring
Export the initial phase difference of phase angle.
Due to the influence of filter in gird-connected inverter, the phase angle of inverter output voltage u falls behind inverter modulating wave phase
Angle Δ θLC, unit ° (degree), so the phase of no phase-locked loop of the present invention sends out virtual synchronous from tracking grid connection presynchronization control method
Motor or the θ of sagging control active power ring output compensate Δ θLC, obtain the modulating wave electrical angle Δ θ of gird-connected inverterI, single
Position ° (degree), the phase angle of inverter output voltage u is θ at this time, and unit ° (degree) is active with virtual synchronous generator or sagging control
Power ring output phase angle theta is identical, i.e., identical as the d axis phase angle of dq axis, as shown in Figure 6.
The target of the phase of no phase-locked loop from tracking grid connection presynchronization control method is the rotation angular frequency for adjusting dq axis, is made
Phase difference θ between the d axis and network voltage of dq axis gradually goes to zero, wherein d axis phase angle be virtual synchronous generator or under
It hangs down control active power ring output phase angle theta and equal with the phase angle of inverter output voltage u；It, can from Fig. 6 when Δ θ is zero
To find out that network voltage is projected as zero, and the d axis of dq axis and network voltage u in q axis componentgPhase coincidence, at this time inversion
Device output voltage u phase angle and network voltage ugPhase angle is consistent, therefore can be by controlling ugqTend to 0 to realize the same of the two phase
Step.
Its specific control process is, referring to Fig. 4, network voltage is converted to obtain u by 3s/2sgα、ugβ, unit V (volt),
Then ugα、ugβ2s/2r is inputted simultaneously and converts to obtain with virtual synchronous generator or sagging control active power ring output phase angle theta
ugq、ugd, unit V (volt), with reference value Uq* after=0 being compared, obtained difference carries out PI adjusting, and pi regulator is exported
Δ ωg, unit rad/s (radian per second), compensation is to virtual synchronous generator or sagging control active power ring output angular velocity
The phase and frequency of ω, unit rad/s (radian per second), i.e., adjustable inverter output voltage make it gradually realize that inverter is defeated
Voltage is synchronous with electric network voltage phase out.The Δ θ of the sample point of θ and compensation in Fig. 4LCFor innovative point of the present invention.
As it can be seen that θ used in the dq axis rotating coordinate system of the method for the present invention is that virtual synchronous generator or sagging control are active
Power ring exports phase angle theta, eliminates and carries out locking phase to network voltage, simplifies algorithm.
3.2) gird-connected inverter output voltage amplitude is adjusted, detailed process is,
Since output voltage amplitude may be not identical as grid voltage amplitude in off-grid operation for inverter, if when grid-connected
Both sides difference in magnitude is larger to also result in excessive rush of current, so must adjust inverter output voltage width when grid-connected
Value.
When inverter, which is switched to grid-connect mode from island mode preparation, to be run, grid connection presynchronization output voltage amplitude is adjusted
Switch 61 (being known as switch 1 in KA, Fig. 2) closes at Δ u, unit V (volt), starts voltage magnitude presynchronization, that is, is adjusted inverse
Become the output voltage amplitude u of devicem, make inverter output voltage amplitude um, unit V (volt), with grid voltage amplitude ugm, unit V
(volt), it is identical；
Its specific control process is, referring to Fig. 5, network voltage uga, unit V (volt), ugb, unit V (volt), ugc, unit V
(volt) converts to obtain u by 3s/2sgα, unit V (volt), ugβ, unit V (volt), then ugα、ugβMould is calculated through Overvoltage Amplitude
Block obtains ugm, unit V (volt).With grid voltage amplitude ugmIt is given, inverter output voltage amplitude umTo feed back, to what is obtained
Difference carries out PI adjusting, and output the Δ u, unit V (volt) of pi regulator are compensated to virtual synchronous generator or sagging control nothing
The voltage of function power ring is given, i.e., the output voltage amplitude of adjustable inverter finally makes inverter output voltage amplitude tracking
Grid voltage amplitude.
Step 4) is closed three-phase grid contactor,
When network voltage is with gird-connected inverter output voltage frequency, electrical angle and consistent amplitude, closure three-phase grid is connect
Tentaculum 60 (PCC)；
Step 5) disconnects phase, amplitude presynchronization controls the adjusting to gird-connected inverter,
After grid-connected inverters success, grid connection presynchronization output voltage amplitude regulating switch 61 (is known as switching in KA, Fig. 2
1) it closes at 0, that is, closes grid-connected pre- with grid connection presynchronization output voltage phase adjusted switch 62 (being known as switch 2 in KB, Fig. 2)
Synchronously control；So far, inverter is incorporated into the power networks,.
Simulating, verifying
In order to illustrate the validity of the method for the present invention, simulating, verifying, verification result and data point have been carried out in MATLAB
It analyses as follows:
The operating condition of emulation are as follows: the rated active power of inverter is 2500W, reactive power 0W.The inversion in 0~0.7s
Device off-network band 1000W load running, starts presynchronization control in 0.4s, and grid-connected switch, system grid connection fortune are closed in 0.7s
When row, grid-connected switch is disconnected in 1.8s, inverter switchs to off-grid operation；Emulation terminates when t=2.5s.
Fig. 7 is that double PLL presynchronization control contravarianter voltage angle and line voltage angle, and as can be seen from Figure 7 its is inverse
Become device output voltage electrical angle and network voltage electrical angle is finally identical.
Fig. 8 is that conventional phase from tracking presynchronization controls contravarianter voltage angle and line voltage angle, can be with from Fig. 8
Find out that its inverter output voltage electrical angle and network voltage electrical angle are finally identical.
Fig. 9 is that the phase of the no phase-locked loop of the method for the present invention controls contravarianter voltage angle and electricity from tracking grid connection presynchronization
Net level angle, as can be seen from Figure 9 its inverter output voltage electrical angle and network voltage electrical angle are finally identical.
It can be seen that double PLL presynchronization control synchronization times control the time from tracking presynchronization than phase from Fig. 7~Fig. 9
Slightly longer, the method for the present invention is identical from tracking presynchronization performance as traditional phase.
Figure 10 is that double PLL presynchronization control inverter output A phase voltage and power grid A phase voltage, as can be seen from Figure 10
Its inverter exports A phase voltage and power grid A phase voltage is finally identical.
Figure 11 is conventional phase from tracking presynchronization control inverter output A phase voltage and power grid A phase voltage, from Figure 11
It can be seen that inverter output A phase voltage and power grid A phase voltage are finally identical.
Figure 12 is that the phase of the no phase-locked loop of the method for the present invention controls inverter output A phase voltage from tracking grid connection presynchronization
With power grid A phase voltage, as can be seen from Figure 12 inverter output A phase voltage and power grid A phase voltage are finally identical.
It can be seen that three kinds of control methods can all be such that inverter output voltage is overlapped with network voltage from Figure 10~Figure 12.It is double
The tracking presynchronization control time is slightly longer certainly than phase for the control of PLL presynchronization, and traditional phase controls and this hair from tracking presynchronization
The performance of bright method is identical.
Figure 13 is that double PLL presynchronization control inverters and export A phase voltages and power grid A phase voltage difference, can be with from Figure 13
Find out inverter output A phase voltage and power grid A phase voltage difference is finally 0.
Figure 14 is conventional phase from tracking presynchronization control inverter output A phase voltage and power grid A phase voltage difference, from figure
It can be seen that inverter output A phase voltage and power grid A phase voltage difference are finally 0 in 14.
Figure 15 is that the phase of the no phase-locked loop of the method for the present invention exports A phase voltage from tracking grid connection presynchronization control inverter
With power grid A phase voltage difference, as can be seen from Figure 15 inverter output A phase voltage and power grid A phase voltage difference are finally 0.
It can be seen that double PLL presynchronization controls inverter output A phase voltage and power grid in 45.3ms from Figure 13~Figure 15
A phase voltage difference is almost 0.Conventional phase is controlled from tracking presynchronization and the method for the present invention is all 43.5ms.
Figure 16 is that double PLL presynchronization control inverter output current, and as can be seen from Figure 16 inverter output current exists
There is no rush of current when grid-connected, smooth can be connected to the grid.
Figure 17 is conventional phase from tracking presynchronization control inverter output current, and as can be seen from Figure 17 inverter is defeated
Electric current does not have rush of current when grid-connected out, smooth can be connected to the grid.
Figure 18 is that the phase of the no phase-locked loop of the method for the present invention controls inverter output current from tracking grid connection presynchronization, from
It can be seen that inverter output current does not have rush of current when grid-connected in Figure 18, smooth can be connected to the grid.
The inverter that can be seen that three kinds of presynchronization control methods from Figure 16~Figure 18 impacts all very in grid-connected immediate current
Small, in inverter off-network, inverter can be very good to be transitioned into off-grid operation.
By above-mentioned simulating, verifying and comparison, control method of the present invention is available grid-connected pre- from tracking with conventional phase
The identical control effect of synchronisation control means.
Claims (6)
1. a kind of phase of no phase-locked loop tracks grid connection presynchronization control method certainly, which is characterized in that follow the steps below to implement:
Step 1) obtains the electrical angle θ of modulating wave by active power ring in virtual synchronous generator or sagging control；
Step 2) compensates the electrical angle of modulating wave；
Gird-connected inverter output voltage phase, amplitude is adjusted in step 3), keeps it identical as electric network voltage phase, amplitude；
Step 4) is closed three-phase grid contactor；
Step 5) disconnects phase, amplitude presynchronization controls the adjusting to gird-connected inverter,.
2. the phase of no phase-locked loop tracks grid connection presynchronization control method certainly according to claim 1, which is characterized in that described
Step 1) in, detailed process is:
Grid connection presynchronization output voltage amplitude regulating switch (61) and grid connection presynchronization output voltage phase adjusted switch (62) are all
It closes at 0, and three-phase grid contactor (60) is in an off state；Gird-connected inverter operates in island state, virtual synchronous
Generator or the active power ring of sagging control obtain voltage-phase θ, and unit is degree.
3. the phase of no phase-locked loop tracks grid connection presynchronization control method certainly according to claim 2, which is characterized in that described
Step 2) in, detailed process is:
The electrical angle and virtual synchronous generator of inverter output voltage or sagging control pass through active power ring and obtain modulating wave
Electrical angle θ have a fixed angle Δ θLC；Then the electrical angle moved back electrical angle θ and gird-connected inverter filter phases
ΔθLCAddition obtains θI, the as actual modulated wave electrical angle θ of gird-connected inverterI；Using fixed value to Δ θLCIt compensates, then
The electrical angle of gird-connected inverter output voltage is θ at this time.
4. the phase of no phase-locked loop tracks grid connection presynchronization control method certainly according to claim 3, which is characterized in that described
Step 3) in, grid-connected smooth sliding control include voltage-phase presynchronization control with amplitude presynchronization control two parts；When inverse
When change device prepares grid-connected, grid connection presynchronization output voltage amplitude regulating switch (61) and grid connection presynchronization output voltage phase adjusted
Switch (62) is respectively closed at Δ u, Δ ω, that is, starts grid-connected smooth sliding control,
3.1) gird-connected inverter output voltage phase is adjusted, detailed process is,
Wherein virtual synchronous generator or the electrical angle of sagging control active power ring output are θ, are rotated with angular velocity omega, unit
For radian per second；
At this point, network voltage ug, phase θg, with angular velocity omegagRotation；
Inverter modulates wave voltage uM, phase θM, rotated with angular velocity omega；
Inverter output end voltage u, phase θ are rotated with angular velocity omega；
Network voltage ugWith the q axis under virtual synchronous generator or the dq axis coordinate system of sagging control active power ring output θ rotation
Component is ugq；
Network voltage ugWith the d axis under virtual synchronous generator or the dq axis coordinate system of sagging control active power ring output θ rotation
Component is ugd；
As network voltage ugIt is equal with the angular speed of inverter output end voltage u and when keeping constant, it can always exist between the two
One initial phase difference θerror；When inverter, which is switched to grid-connect mode from island mode preparation, to be run, grid connection presynchronization output
Voltage-phase regulating switch (62) closes at Δ ω, initiation culture phase presynchronization, adjusts the angle speed of inverter output voltage u
ω is spent, inverter output voltage u phase and network voltage u are madegPhase coincidence realizes inverter output voltage and network voltage phase
Position is consistent,
By network voltage ug, transform to and sat with virtual synchronous generator or sagging control active power ring output θ, the dq axis of rotation
Under mark system, expression formula is as follows:
Wherein θerror, the initial of phase angle is exported for grid voltage phase-angle and virtual synchronous generator or sagging control active power ring
Phase difference,
The rotation angular frequency for adjusting dq axis, makes the phase difference θ between the d axis of dq axis and network voltage gradually go to zero, wherein d
Axis phase angle is that virtual synchronous generator or sagging control active power ring export phase angle theta and the phase with inverter output voltage u
Angle is equal；
3.2) gird-connected inverter output voltage amplitude is adjusted, detailed process is,
When inverter, which is switched to grid-connect mode from island mode preparation, to be run, grid connection presynchronization output voltage amplitude regulating switch
(61) it closes at Δ u, starts voltage magnitude presynchronization, adjust the output voltage amplitude u of inverterm, make inverter output electricity
Pressure amplitude value umWith grid voltage amplitude ugmIt is identical；
Its control method is, with grid voltage amplitude ugmIt is given, inverter output voltage amplitude umTo feed back, to obtained difference
Value carries out PI adjusting, and the output Δ u of pi regulator is compensated to the electricity to virtual synchronous generator or sagging control reactive power ring
Pressure is given, adjusts the output voltage amplitude of inverter, finally makes inverter output voltage amplitude tracking grid voltage amplitude.
5. the phase of no phase-locked loop tracks grid connection presynchronization control method certainly according to claim 4, which is characterized in that described
Step 4) in, detailed process is: when network voltage is with gird-connected inverter output voltage frequency, electrical angle and consistent amplitude,
It is closed three-phase grid contactor (60).
6. the phase of no phase-locked loop tracks grid connection presynchronization control method certainly according to claim 5, which is characterized in that described
Step 5) in, detailed process is: when grid-connected inverters success after, grid connection presynchronization output voltage amplitude regulating switch (61) and
Grid connection presynchronization output voltage phase adjusted switch (62) closes at 0, i.e. the control of closing grid connection presynchronization；So far, inverter
It is incorporated into the power networks,.
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