CN100346552C - Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage - Google Patents
Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage Download PDFInfo
- Publication number
- CN100346552C CN100346552C CNB2005100507619A CN200510050761A CN100346552C CN 100346552 C CN100346552 C CN 100346552C CN B2005100507619 A CNB2005100507619 A CN B2005100507619A CN 200510050761 A CN200510050761 A CN 200510050761A CN 100346552 C CN100346552 C CN 100346552C
- Authority
- CN
- China
- Prior art keywords
- inverter
- output voltage
- output
- incorporated
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The present invention discloses grid connected seamless switching technique for a PWM inverter based on the amplitude adjustment of output voltage. An inverter connected with a power network by a static changeover switch is in an output current control mode in grid connected operation and in an output voltage control mode in independent loading operation disengaged from a power network. In the changeover process from the grid connected operation to the independent operation, the output control of the inverter is converted into voltage control from current control, and driving signals of the static changeover switch is blocked; simultaneously, the amplitude of the inversion output voltage is controlled to force the current of the static changeover switch to rapidly fall to zero, the output of the inverter is disengaged from the power network, and thereby, the operation of the inverter is stably switched to the independent loading operation. The present invention has the advantages of simple and feasible method and rapid changeover, restrains the wave motion of loading voltage in the changeover process and ensures the continuity of loading power supply. The grid connected seamless switching technique is suitable for three-phrase or one-phrase inversion power supplies controlled by various PWM methods and can be used for various multifunctional power supply systems with the grid connected operation or the independent operation for power generation by using solar energy, wind, fuel cells, etc.
Description
Technical field
The present invention relates to the operational mode switching method of parallel network reverse power supply, especially the PWM inverter of regulating based on the output voltage amplitude seamless handover method that is incorporated into the power networks.
Background technology
Have and generate electricity by way of merging two or more grid systems and the inverter of independent run with load, its circuit structure generally includes that the single-phase or three-phase inverter PCU of pulse width modulation (PWM) control based on HF switch, voltage control loop, current regulator, PWM waveform generate link, the LCL low pass filter that is made of inductance capacitance and the static state switching anti-parallel thyristor switch S TS that connects electrical network and inverter.Inverter is the control of output current control ring when being incorporated into the power networks, be the control of output voltage control ring when breaking away from electrical network independence run with load.The fluctuation of output voltage and electric current will influence the power supply quality of inverter load in the handoff procedure of two kinds of operational modes, and especially when the electrical network catastrophic failure, inverter is from the handoff procedure of the independent operating that is incorporated into the power networks.Traditional method for handover control is that the driving of earlier static state being switched anti-parallel thyristor switch S TS when switching is removed, and treats to turn-off when electric current drops to zero naturally that inverter forwards voltage control free band carrying row mode to then.This method makes output voltage have long out-of-control time, easily causes the big disturbance of load voltage.
Summary of the invention
The purpose of this invention is to provide a kind of PWM inverter of regulating based on output voltage amplitude seamless handover method that is incorporated into the power networks, to shorten output voltage out-of-control time, reduce the load voltage disturbance, realize the seamless switching of combining inverter from the independent run with load that is incorporated into the power networks.
The PWM inverter of regulating based on the output voltage amplitude of the present invention seamless handover method that is incorporated into the power networks, the inverter that switches anti-parallel thyristor switch connection electrical network by static state is the output current control model when being incorporated into the power networks, when breaking away from electrical network independence run with load is output voltage control mode, it is characterized in that from the handoff procedure of the independent operating that is incorporated into the power networks, earlier inverter output control is converted to voltage control from Current Control, and the drive signal of blocking static switching anti-parallel thyristor switch, controlling the inverter output voltage amplitude simultaneously forces the static electric current that switches the anti-parallel thyristor switch to quickly fall to zero, inverter output breaks away from electrical network, thereby switches to independent run with load reposefully.
Above-mentioned PWM inverter is from the switching controls of the independent operating that is incorporated into the power networks, can realize by microprocessor and software thereof with voltage control link, Current Control link and switching controls command switch SW, when SW was 1, invertor operation was in the output current control mode; When SW was 0, invertor operation was in the output voltage control mode.Also can realize by analog-digital hybrid circuit with voltage control link, Current Control link and above-mentioned switch control logic.
The PWM inverter of regulating based on the output voltage amplitude of the present invention seamless switching technique simple possible that is incorporated into the power networks, realized the quick switching of inverter output from the independent operating that is incorporated into the power networks, and in handoff procedure, suppressed the fluctuation of load voltage, only be about 1ms, to have guaranteed the continuity of electric switching time.The present invention is applicable to that with MOSFET, IGBT and other semiconductor power device be switch, adopt the three-phase or the single-phase inversion power supply of the control of various forms PWM method, be used for various being incorporated into the power networks and independent operating multifunction electric origin system such as solar energy, wind-force, fuel cell power generation.
Description of drawings
Fig. 1 is a kind of specific implementation method of the present invention circuit theory diagrams;
Fig. 2 is an operational mode switching controls flow chart of the present invention;
Fig. 3 adopts inverter of the present invention to switch the output current and the voltage oscillogram of front and back from the independent operating that is incorporated into the power networks;
Fig. 4 is b each electric current and voltage of the phase (t in handoff procedure among Fig. 3
0To t
4The expanded view of waveform constantly).
Embodiment
Example shown in Figure 1, the PWM inverter is exported the seamless switching that is incorporated into the power networks and is adopted the switch control logic of microprocessor and switching controls command switch SW to realize, power-supply system comprises based on the PWM of HF switch control single-phase or three-phase inverter PCU, by low pass filter, the static anti-parallel thyristor switch S TS of switching and DSP microprocessor that inductance L 1, L2, capacitor C constitute, include the voltage control loop of independent operating, the current regulator that is incorporated into the power networks, PWM waveform in the DSP microprocessor and generate link and switching command switch SW.The DSP microprocessor adopts the TMS320LF2407A of TI company in this example.Inverter output is connected to the static anti-parallel thyristor switch S TS that switches through the LCL low pass filter, and the other end of STS is connected to electrical network points of common connection PCC.The voltage Vg of filter capacitor C voltage Vo and points of common connection PCC, and the grid-connected current i of the inductance L 2 of flowing through
gBe connected to the DSP microprocessor by feedback circuit, the output pwm switching signal drives the output of amplification back to inverter by inverter after the DSP microprocessor is made signal processing.Vs is a line voltage among the figure, and Lg is the power network line inductance, i
1It is the inverter output current.
The given signal V of the voltage of inverter independent operating (amplitude)
*Be input to the voltage control link,, generate the given v of alternating voltage at first with electrical network feedback signal Vg synchronous waveform
*, after the output voltage feedback signal of calculus of differences and reality subtracted each other, error signal obtained voltage control PWM through PI (proportional integral) adjusting and generates given signal u again
M1, this signal is connected to 0 end of switching command switch SW; The given signal I of the electric current that inverter is incorporated into the power networks (amplitude)
2 *Be input to the Current Control link,, generate the given i of alternating current at first with electrical network feedback signal Vg synchronous waveform
2 *, after calculus of differences and actual output current feedback signal were subtracted each other, error signal obtained Current Control PWM through the PI adjusting and generates given signal u again
M2, this signal is connected to 1 end of switching command switch SW.The switching command switch is selected two-way to import one of them and is generated link to the PWM waveform, produces pwm switching signal, outputs to inverter again.When SW was 1, invertor operation was in the output current control mode; When SW was 0, invertor operation was in the output voltage control mode.
The inverter that switches anti-parallel thyristor switch S TS connection electrical network by static state is the output current control model when being incorporated into the power networks, when breaking away from electrical network independence run with load is output voltage control mode, the operational mode method for handover control is referring to Fig. 2, at first power-supply system runs on the pattern of being incorporated into the power networks, control logic is checked the operational mode switching condition, in case satisfy (Y) then enter next step operational mode handoff procedure, otherwise (N) then continue to be incorporated into the power networks.Feature of the present invention is when satisfying switching condition, during from the handoff procedure of the independent operating that is incorporated into the power networks, earlier inverter output control is converted to voltage control (SW forwards " 0 " position to by " 1 " position) from Current Control, and blocks the static drive signal of switching anti-parallel thyristor switch S TS.According to inverter operation pattern control inverter output voltage, promptly when the inverter generator operation, reduce output voltage simultaneously, when the inverter rectification moves, improve output voltage, make inductance L
2Terminal voltage V
LWith current i
gOppositely, force the static electric current that switches the anti-parallel thyristor switch to quickly fall to zero, inversion output and electrical network break away from, and after time-delay, inversion output pulls back to rated voltage amplitude, thereby switches to run with load independently slightly.
The independent operating handoff procedure output voltage that is incorporated into the power networks that with the three-phase is example (is capacitance voltage V
o), power network current, inductance L
2Voltage V
LWaveform as shown in Figure 3 and Figure 4.Among Fig. 3, I
Ga, I
Gb, I
GcBe respectively a phase, b phase and c power network current mutually, V
Oa, V
Ob, V
OcBe respectively a phase, b phase and c inverter output voltage mutually.Fig. 4 is b each electric current and voltage of the phase (t in handoff procedure among Fig. 3
0To t
4The expansion of waveform constantly).V among the figure
o, i
gB phase inversion output voltage V in the difference corresponding diagram 3
ObWith power network current I
Gb
The inverter output voltage of handoff procedure and power network current waveform are described as follows stage by stage:
Stage 1 (t
0-t
1):
Before switching beginning, satisfy the synchronous requirement of line voltage and power network current, when inverter generates electricity by way of merging two or more grid systems, power network current Ig and voltage Vs homophase.At t
0Constantly begin to switch, SW forwards " 0 " position to by " 1 " position, and inversion control forwards voltage mode control to by current control mode, and the given output voltage V that makes of regulation voltage amplitude
oDesired value descends, and impels inductance L
2Terminal voltage and inductive current oppositely and substantially constant.
Stages 2 (t
1-t
2):
Inductance L
2Electric current (power network current i
g) at voltage V
LEffect descends down fast, to t
2Static constantly switching anti-parallel thyristor switch S TS electric current is zero.
Stages 3 (t
2-t
3):
After static switching anti-parallel thyristor switch S TS electric current drops to zero, in a period of time, continue control inverter output voltage amplitude less than line voltage, the duration is switched the time-delay that ends of anti-parallel thyristor switch S TS greater than static state.
Stages 4 (t
3-t
4):
At t
3Constantly, the static cutout time of switching anti-parallel thyristor switch S TS is enough to guarantee that it bears reverse voltage, and inverter control output voltage desired value is got back to the standard set-point, to t
4Constantly, load voltage is replied normal.
Claims (2)
1. the PWM inverter of regulating based on the output voltage amplitude seamless handover method that is incorporated into the power networks, the inverter that switches anti-parallel thyristor switch connection electrical network by static state is the output current control model when being incorporated into the power networks, when breaking away from electrical network independence run with load is output voltage control mode, it is characterized in that from the handoff procedure of the independent operating that is incorporated into the power networks, earlier inverter output control is converted to voltage control from Current Control, and the drive signal of blocking static switching anti-parallel thyristor switch, reducing the inverter output voltage amplitude simultaneously forces the static electric current that switches the anti-parallel thyristor switch to quickly fall to zero, inverter output breaks away from electrical network, thereby switches to independent run with load reposefully.
2. the PWM inverter of regulating based on the output voltage amplitude according to claim 1 seamless handover method that is incorporated into the power networks, it is characterized in that the switching controls of said PWM inverter from the independent operating that is incorporated into the power networks, can realize by microprocessor with voltage control link, Current Control link and switching controls command switch (SW), when switching controls command switch (SW) was 1, invertor operation was in the output current control mode; When switching controls command switch (SW) was 0, invertor operation was in the output voltage control mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100507619A CN100346552C (en) | 2005-07-19 | 2005-07-19 | Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100507619A CN100346552C (en) | 2005-07-19 | 2005-07-19 | Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728496A CN1728496A (en) | 2006-02-01 |
| CN100346552C true CN100346552C (en) | 2007-10-31 |
Family
ID=35927587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100507619A Expired - Fee Related CN100346552C (en) | 2005-07-19 | 2005-07-19 | Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100346552C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008103946A2 (en) | 2007-02-22 | 2008-08-28 | Virginia Tech Intellectual Properties, Inc. | Control method for a universal power condition system |
| CN101694944B (en) * | 2009-10-28 | 2012-01-11 | 盐城工学院 | Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof |
| US8310214B2 (en) * | 2010-06-28 | 2012-11-13 | General Electric Company | System and method for control of multiphase power converters |
| CN103401266B (en) * | 2013-07-11 | 2015-07-15 | 广东志成冠军集团有限公司 | Device and method for realizing seamless switching between grid-connected mode and off-grid mode of inverter |
| CN112803462A (en) * | 2021-03-05 | 2021-05-14 | 上海电气集团股份有限公司 | Forced turn-off method of static transfer switch based on energy storage converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0865899A (en) * | 1994-08-18 | 1996-03-08 | Nissin Electric Co Ltd | Operation control method for dispersed interlocking system |
| JPH11332104A (en) * | 1998-05-13 | 1999-11-30 | Toshiba Corp | Inverter controller for system interconnection |
| JP2000184602A (en) * | 1998-12-11 | 2000-06-30 | Nissin Electric Co Ltd | Distributed power source unit |
-
2005
- 2005-07-19 CN CNB2005100507619A patent/CN100346552C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0865899A (en) * | 1994-08-18 | 1996-03-08 | Nissin Electric Co Ltd | Operation control method for dispersed interlocking system |
| JPH11332104A (en) * | 1998-05-13 | 1999-11-30 | Toshiba Corp | Inverter controller for system interconnection |
| JP2000184602A (en) * | 1998-12-11 | 2000-06-30 | Nissin Electric Co Ltd | Distributed power source unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1728496A (en) | 2006-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2416480B1 (en) | Photovoltaic inverter system and method of starting same at high open-circuit voltage | |
| EP3550692A1 (en) | Medium and high voltage energy conversion system | |
| EP2395644B1 (en) | Method and system to allow for high dc source voltage with lower dc voltage in a two stage power converter | |
| CN102570492B (en) | Power inverter system and method of starting same at high DC voltage | |
| CN102222937B (en) | Photovoltaic grid-connected inverter and grid-connected control method thereof | |
| JP6880234B2 (en) | How to start a flexible DC power transmission system on a remote island | |
| CN101976965B (en) | Direct-current tracing control high-power photovoltaic grid-connected inverter | |
| Lei et al. | Multi-loop control algorithms for seamless transition of grid-connected inverter | |
| CN101694944B (en) | Grid-connected seamless switching controller based on capacitive current inner ring and control method thereof | |
| CN107800298B (en) | Modularized solid-state transformer based on distributed high-frequency transformation and control method thereof | |
| CN100346552C (en) | Seamless switching technique for incorporation PWM inverter into power network based on amplitude adjustment of output voltage | |
| Zhang et al. | Two-stage transformerless dual-buck PV grid-connected inverters with high efficiency | |
| CN110198026A (en) | A kind of the voltage dip governing system and its control method of impedance isolated form | |
| Yao et al. | A novel control strategy for grid-interactive inverter in grid-connected and stand-alone modes | |
| CN109245137B (en) | Control method of energy storage converter | |
| CN102044986B (en) | Unit inverter system | |
| CN111600488A (en) | Method for improving efficiency of power electronic transformer by using zero-crossing detection technology | |
| CN107482671A (en) | Current mode photovoltaic combining inverter low voltage ride through control system and method | |
| Senjyu et al. | Operation strategies for stability of gearless wind power generation systems | |
| Wang et al. | Weighted control research on seamless transfer for dual-mode three phase inverter in micro-grid | |
| Jahan et al. | A grid feeding voltage source inverter with an advanced control scheme for solar PV system | |
| CN104104104A (en) | Method of automatic switching between power generation mode and SVG mode for photovoltaic inverter | |
| Gu et al. | Research on control method of double-mode inverter with grid-connection and stand-alone | |
| US9325273B2 (en) | Method and system for driving electric machines | |
| Huang et al. | Control algorithm research on seamless transfer for distributed resource with a LCL filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071031 Termination date: 20200719 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |