CN106786797A - A kind of control method of the microgrid inverter for improving microgrid busbar voltage quality - Google Patents
A kind of control method of the microgrid inverter for improving microgrid busbar voltage quality Download PDFInfo
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- CN106786797A CN106786797A CN201611225599.4A CN201611225599A CN106786797A CN 106786797 A CN106786797 A CN 106786797A CN 201611225599 A CN201611225599 A CN 201611225599A CN 106786797 A CN106786797 A CN 106786797A
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses a kind of control method of the microgrid inverter for improving microgrid busbar voltage quality, it is characterized in that：The microgrid inverter is to realize that microgrid busbar voltage quality improves by itself controlling autonomous working, and power distribution between unit；And upper strata center management system scheduling can be received, the dispatch command adjustment microgrid inverter output voltage according to tension management system realizes that busbar voltage control improves with quality of voltage.The present invention participates in microgrid busbar voltage quality control using microgrid inverter, by controlling inverter output impedance absorbing load harmonic current, microgrid can not only be reduced improves the input of power electronic equipment dedicated for the quality of power supply, and because the dispersiveness that microgrid inverter is installed causes that control is more flexible.
Description
Technical field
The present invention relates to a kind of control method of the microgrid inverter for improving microgrid busbar voltage quality.
Background technology
Microgrid as one can both be incorporated into the power networks also can off-grid independent operating compact electrical generating systems, its net internal loading form
With very big randomness and diversity.And a large amount of civilian and commercial plants carry power electronic devices interface in netting, make
Obtain load and be characterized primarily by nonlinear characteristic.The harmonic current that nonlinear load causes is in line impedance and inverter output impedance
Upper generation harmonic wave pressure drop, can cause the distortion of busbar voltage, influence bus load supplying quality, possibly even cause when serious and be
System unstability.To improve microgrid power supply quality, a kind of common method is to install the quality of power supply additional to improve device, such as active filter.So
And, power load type and capacity on micro-capacitance sensor median generatrix have very big uncertainty, and this gives power quality controlling device
On-position selection bring difficulty.Ensure that load power quality is accomplished by substantial amounts of power quality adjusting device, this
Micro-grid system construction and operating cost can be undoubtedly significantly greatly increased.Utility power quality control function is increased by microgrid inverter, can
The local compensation for being easily carried out harmonic wave is administered.Therefore, control to make inverter possess harmonics restraint work(by microgrid inverter
Can, to improving the input of power electronic equipment dedicated for the quality of power supply in reduction microgrid, and improve micro-capacitance sensor busbar voltage
Quality advance system reliability, with important theory and realistic meaning.Microgrid busbar voltage control under the conditions of nonlinear load,
Using the control mode of multi-resonant controller mainly under rest frame.Harmonic component for each frequency is controlled
System, often increases a control for frequency harmonic component, just needs to increase a resonant controller, and all inverters are both participated in
The control of quality of voltage.This control program, all inverters both participate in the control of harmonic voltage, and inverter participates in quality of voltage
Control is without selectivity.However, simultaneously not all inverter is suitable for participating in quality of voltage regulation in micro-capacitance sensor, work as combining inverter
When itself full capacity is exported, then it is difficult to participate in the control of quality of voltage.In addition, often increasing the control of first harmonic voltage, just need to increase
Plus a resonant controller, contravarianter voltage controller complexity.
The content of the invention
The present invention is to avoid the deficiency existing for above-mentioned prior art, there is provided a kind of system control is flexible, control method
Improve the control method of the microgrid inverter of microgrid busbar voltage quality under succinct nonlinear load.
The present invention is adopted the following technical scheme that to solve technical problem：
The present invention improve microgrid busbar voltage quality microgrid inverter control method the characteristics of be：The microgrid inversion
Device is to realize that microgrid busbar voltage quality improves by itself controlling autonomous working, and power distribution between unit；And can
Receive upper strata center management system scheduling, the dispatch command adjustment microgrid inverter output voltage according to tension management system is real
Existing busbar voltage control improves with quality of voltage.
The characteristics of present invention improves the control method of the microgrid inverter of microgrid busbar voltage quality lies also in：It is inverse in microgrid
The voltage control loop for becoming device increases harmonic impedance control, by simulating harmonic wave negative impedance absorbing load harmonic current, improves microgrid
Busbar voltage quality.
The characteristics of present invention improves the control method of the microgrid inverter of microgrid busbar voltage quality lies also in：Real-time monitoring
Microgrid inverter output current, extracts the harmonic components of microgrid inverter output current, according to virtual impedance and line impedance meter
Calculate and obtain harmonic reference voltage, by the harmonic reference voltage superposition to fundamental wave reference voltage, and then control inverter output electricity
Pressure, makes inverter possess negative harmonic impedance characteristic, and busbar voltage quality is improved with this；Meanwhile, in the microgrid inverter receiving
The size of the scheduling of layer managing system, real time modifying virtual impedance and line impedance is with adaptive system difference operating condition.
The characteristics of present invention improves the control method of the microgrid inverter of microgrid busbar voltage quality lies also in：The inversion
The control algolithm of device output voltage is：
Calculated using droop control and obtain inverter fundamental wave reference voltage ureff；
By feeder current ioLow-pass filtered device LPF extracts fundamental current io1, by the fundamental current io1It is multiplied by virtual
Impedance ZvObtain virtual impedance voltage uv；
By feeder current ioExtracted through harmonic wave and obtain harmonic current components iom, m=6n ± 1, n=1,2,3 ..., will be described humorous
Ripple current component iomWith m subharmonic reactance XmIt is multiplied and obtains m subharmonic voltage reference values urefm, m=6n ± 1；
By feeder current ioFundametal compoment is filtered through high-pass filter HPF obtain harmonic current ih, by the harmonic current ih
It is multiplied by harmonic wave resistance RhObtain harmonic wave resistive reference magnitude of voltage urefR；
Then, harmonic impedance voltage reference value urefhFor：
Wherein, virtual impedance Zv, harmonic compensation number of times m, harmonic wave reactance XmAnd harmonic wave resistance RhReceive upper strata central management
The scheduling of system, being capable of online modification.
The characteristics of present invention improves the control method of the microgrid inverter of microgrid busbar voltage quality lies also in：
Calculated by formula (1) and obtain microgrid inverter with reference to given voltage uref：
uref=ureff+uv+urefh (1)
By the microgrid inverter with reference to given voltage urefReference voltage ac-dc axis point under rotation transformation to rotating coordinate system
AmountBy microgrid inverter output voltage uoRotation transformation is voltage ac-dc axis component u under rotating coordinate systemodq, then voltage error
ΔudqFor：
By the voltage error Δ udqFundamental current reference value is obtained using the fundamental wave controller characterized by formula (2)
(ifdq)k：
(ifdq)k=a0(Δudq)k+a1(Δudq)k-1-b1(ifdq)k-1 (2)
In formula (2), k is kth time sampling instant, and k-1 is -1 sampling instant of kth, b1=-1, kvPIt is fundamental wave controller proportionality coefficient, kvIIt is fundamental wave controller integral coefficient, TsIt is the sampling period.
The voltage error Δ udqThe m subharmonic controllers characterized via formula (3) obtain m subharmonic current reference values
(imd,q)k：
(imd,q)k=c1(Δudq)k+c2(Δudq)k-2-d1(imdq)k-1-d2(imdq)k-2 (3)
In formula (3)：
Wherein, m is corresponding each overtone order, kRhIt is harmonic controller proportionality coefficient, ωcIt is harmonic controller cutoff frequency
Rate, ω0It is fundamental voltage frequency；
Based on individual harmonic current reference value (imdq)kCalculate and obtain harmonic current reference value (imd,q)kFor：
Then have：Current reference valueFor：
By inverter current iLElectric current ac-dc axis electric current i under rotation transformation to rotating coordinate systemLdq, by current reference value
With electric current ac-dc axis electric current i under rotating coordinate systemLdqDiffer from, then through current controller output voltage reference value Udq, by the voltage
Reference value UdqIt is rotated to be converted into u under rest frameabc, with the uabcSPWM modulation is participated in, microgrid inverter power is controlled
The break-make of switching tube.
The present invention gives whether inverter participates in voltage matter for microgrid busbar voltage control under the conditions of nonlinear load
Amount control is controllable, participate in harmonic voltage number of times improves optional system control method, and harmonic controling is calculated under single coordinate transform
Method；Its microgrid inverter can both receive the control of tension management system call, and top level control independent operating can be departed from again.Based on list
Coordinate transform resonance is controlled, and resonant controller can realize the control to two order harmonic components, and can receive upper strata
Scheduling, participates in specifying subharmonic voltage control；Compared with the prior art, the present invention has the beneficial effect that：
1st, present system can reduce the input of special microgrid electric energy governing device；
2nd, present system is more flexible in terms of busbar voltage quality control；
3rd, the micro-grid inverter voltage control algolithm of present system is more succinct.
Brief description of the drawings
Fig. 1 is micro-grid system structured flowchart involved in the present invention
Fig. 2 is busbar voltage System control structures schematic diagram of the present invention；
Fig. 3 is control method flow chart of the present invention；
Specific embodiment
Referring to Fig. 1, micro-grid system includes several distributed generation units, linear and non-linear negative in the present embodiment
Load, drive circuit, over-sampling modulate circuit and protection circuit, are connected in parallel between several distributed generation units, including
Main circuit, local controller, common bus is connected to by feeder line；Main circuit includes that micro- source for being sequentially connected with, three phase full bridge are inverse
Become device, filter inductance L, filter capacitor C, feeder line, three-phase full-bridge inverter circuit includes six power switch pipes, and common bus is also
Connect linear and nonlinear load；Several distributed generation units, the linear processes load independent micro-capacitance sensor of composition, system
Also include the communication system of connection local controller and microgrid central controller.
Improving the control method of the microgrid inverter of microgrid busbar voltage quality in the present embodiment is：Microgrid inverter is logical
Cross itself control autonomous working and realize that microgrid busbar voltage quality improves, and power distribution between unit；And on can receiving
Layer center management system scheduling, the dispatch command adjustment microgrid inverter output voltage according to tension management system, realizes bus
Voltage controls to improve with quality of voltage.
Increase harmonic impedance control in the voltage control loop of microgrid inverter, it is humorous by simulating harmonic wave negative impedance absorbing load
Ripple electric current, improves microgrid busbar voltage quality.By extracting harmonic current on feeder line, it is considered to line impedance and virtual impedance, meter
Corresponding subharmonic voltage reference value is asked in calculation, and control microgrid inverter output voltage realizes changing for microgrid busbar voltage quality indirectly
It is kind.
Implement by real-time monitoring microgrid inverter output current, extract the harmonic wave of microgrid inverter output current into
Point, calculated according to virtual impedance and line impedance and obtain harmonic reference voltage, by harmonic reference voltage superposition to fundamental wave with reference to electricity
Pressure, and then inverter output voltage is controlled, inverter is possessed negative harmonic impedance characteristic, busbar voltage quality is improved with this；Together
When, microgrid inverter can receive the management and dispatching of upper strata central controller, real time modifying virtual impedance and line impedance it is big
It is small with adaptive system difference operating condition.Upper strata central controller can be online to determine modification according to system busbar voltage condition
Microgrid inverter participates in the variables such as harmonic voltage coefficient, each frequency harmonic impedance size, virtual impedance size, and this causes system control
System is more flexible, is suitable for the micro-grid system of different networking structures and without operating condition.The control flow of microgrid inverter
As shown in Figure 3.
For the control of harmonic current, realized typically under rest frame, a controller is used for every subharmonic.
By will be realized under harmonic conversion to rotating coordinate system in the present invention, because adjacent subharmonic is characterized as together under rotating coordinate system
One frequency AC amount a, controller can be realized to two controls of frequency harmonic component.Compared with being controlled under rest frame,
The use of half harmonic controller can be reduced, controller is more succinct, operand is small.
The control algolithm of inverter output voltage is：
Calculated using droop control and obtain inverter fundamental wave reference voltage ureff；
By feeder current ioLow-pass filtered device LPF extracts fundamental current io1, by fundamental current io1It is multiplied by virtual impedance
ZvObtain virtual impedance voltage uv；
By feeder current ioExtracted through harmonic wave and obtain harmonic current components iom, m=6n ± 1, n=1,2,3 ..., will be described humorous
Ripple current component iomWith m subharmonic reactance XmIt is multiplied and obtains m subharmonic voltage reference values urefm, m=6n ± 1；
By feeder current ioFundametal compoment is filtered through high-pass filter obtain harmonic current ih, by harmonic current ihIt is multiplied by humorous
Ripple resistance RhObtain harmonic wave resistive reference magnitude of voltage urefR；
Then, harmonic impedance voltage reference value urefhFor：
Wherein, virtual impedance Zv, harmonic compensation number of times m, harmonic wave reactance XmAnd harmonic wave resistance RhReceive upper strata central management
The scheduling of system, being capable of online modification.
It is to carry out as follows in specific implementation：
Calculated by formula (1) and obtain microgrid inverter with reference to given voltage uref：
uref=ureff+uv+urefh (1)
By microgrid inverter with reference to given voltage urefReference voltage ac-dc axis component under rotation transformation to rotating coordinate systemBy microgrid inverter output voltage uoRotation transformation is voltage ac-dc axis component u under rotating coordinate systemodq, then voltage error Δ
udqFor：
By the voltage error Δ udqFundamental current reference value is obtained using the fundamental wave controller characterized by formula (2)
(ifdq)k：
(ifdq)k=a0(Δudq)k+a1(Δudq)k-1-b1(ifdq)k-1 (2)
In formula (2), k is kth time sampling instant, and k-1 is -1 sampling instant of kth, b1=-1, kvPIt is fundamental wave controller proportionality coefficient, kvIIt is fundamental wave controller integral coefficient, TsIt is the sampling period.
Voltage error Δ udqThe m subharmonic controllers characterized via formula (3) obtain m subharmonic current reference values (imd,q)k：
(imd,q)k=c1(Δudq)k+c2(Δudq)k-2-d1(imdq)k-1-d2(imdq)k-2 (3)
In formula (3)：
Wherein, m is corresponding each overtone order, kRhIt is harmonic controller proportionality coefficient, ωcIt is harmonic controller cutoff frequency
Rate, ω0It is fundamental voltage frequency；
Based on individual harmonic current reference value (imdq)kCalculate and obtain harmonic current reference value (ihdq)kFor：
Then have：Current reference valueFor：
By inverter current iLElectric current ac-dc axis electric current i under rotation transformation to rotating coordinate systemLdq, by current reference value
With electric current ac-dc axis electric current i under rotating coordinate systemLdqDiffer from, then through current controller output voltage reference value Udq, by Voltage Reference
Value UdqIt is rotated to be converted into u under rest frameabc, with uabcSPWM modulation is participated in, control microgrid inverter power switch pipe
Break-make.
Claims (5)
1. it is a kind of improve microgrid busbar voltage quality microgrid inverter control method, it is characterized in that：The microgrid inverter
It is to realize that microgrid busbar voltage quality improves by itself controlling autonomous working, and power distribution between unit；And can connect
By the scheduling of upper strata center management system, the dispatch command adjustment microgrid inverter output voltage according to tension management system is realized
Busbar voltage controls to improve with quality of voltage.
2. it is according to claim 1 improve microgrid busbar voltage quality microgrid inverter control method, it is characterized in that：
Increase harmonic impedance control in the voltage control loop of microgrid inverter, by simulating harmonic wave negative impedance absorbing load harmonic current,
Improve microgrid busbar voltage quality.
3. it is according to claim 2 improve microgrid busbar voltage quality microgrid inverter control method, it is characterized in that：
Real-time monitoring microgrid inverter output current, extracts the harmonic components of microgrid inverter output current, according to virtual impedance and line
Road impedance computation obtains harmonic reference voltage, by the harmonic reference voltage superposition to fundamental wave reference voltage, and then controls inversion
Device output voltage, makes inverter possess negative harmonic impedance characteristic, and busbar voltage quality is improved with this；Meanwhile, the microgrid inversion
Device receives the scheduling of tension management system, and the size of real time modifying virtual impedance and line impedance is with the different operation works of adaptive system
Condition.
4. it is according to claim 2 improve microgrid busbar voltage quality microgrid inverter control method, it is characterized in that：
The control algolithm of the inverter output voltage is：
Calculated using droop control and obtain inverter fundamental wave reference voltage ureff；
By feeder current ioLow-pass filtered device LPF extracts fundamental current io1, by the fundamental current io1It is multiplied by virtual impedance
ZvObtain virtual impedance voltage uv；
By feeder current ioExtracted through harmonic wave and obtain harmonic current components iom, m=6n ± 1, n=1,2,3 ..., by harmonic wave electricity
Flow component iomWith m subharmonic reactance XmIt is multiplied and obtains m subharmonic voltage reference values urefm, m=6n ± 1；
By feeder current ioFundametal compoment is filtered through high-pass filter HPF obtain harmonic current ih, by the harmonic current ihIt is multiplied by
Harmonic wave resistance RhObtain harmonic wave resistive reference magnitude of voltage urefR；
Then, harmonic impedance voltage reference value urefhFor：
Wherein, virtual impedance Zv, harmonic compensation number of times m, harmonic wave reactance XmAnd harmonic wave resistance RhReceive upper strata center management system
Scheduling, being capable of online modification.
5. according to claim 4 improvement microgrid busbar voltage quality microgrid inverter control method, it is characterized in that：
Calculated by formula (1) and obtain microgrid inverter with reference to given voltage uref：
uref=ureff+uv+urefh (1)
By the microgrid inverter with reference to given voltage urefReference voltage ac-dc axis component under rotation transformation to rotating coordinate systemBy microgrid inverter output voltage uoRotation transformation is voltage ac-dc axis component u under rotating coordinate systemodq, then voltage error Δ
udqFor：
By the voltage error Δ udqFundamental current reference value (i is obtained using the fundamental wave controller characterized by formula (2)fdq)k：
(ifdq)k=a0(Δudq)k+a1(Δudq)k-1-b1(ifdq)k-1 (2)
In formula (2), k is kth time sampling instant, and k-1 is -1 sampling instant of kth, b1=-1, kvPIt is fundamental wave controller proportionality coefficient, kvIIt is fundamental wave controller integral coefficient, TsIt is the sampling period.
The voltage error Δ udqThe m subharmonic controllers characterized via formula (3) obtain m subharmonic current reference values (imd,q)k：
(imd,q)k=c1(Δudq)k+c2(Δudq)k-2-d1(imdq)k-1-d2(imdq)k-2 (3)
In formula (3)：
Wherein, m is corresponding each overtone order, kRhIt is harmonic controller proportionality coefficient, ωcFor harmonic controller cut-off frequency,
ω0It is fundamental voltage frequency；
Based on individual harmonic current reference value (imdq)kCalculate and obtain harmonic current reference value (imd,q)kFor：
Then have：Current reference valueFor：
By inverter current iLElectric current ac-dc axis electric current i under rotation transformation to rotating coordinate systemLdq, by current reference valueWith rotation
Turn electric current ac-dc axis electric current i under coordinate systemLdqDiffer from, then through current controller output voltage reference value Udq, by the Voltage Reference
Value UdqIt is rotated to be converted into u under rest frameabc, with the uabcSPWM modulation is participated in, microgrid inverter power switch is controlled
The break-make of pipe.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108414838A (en) * | 2018-02-06 | 2018-08-17 | 西安交通大学 | A kind of inverter parallel system line impedance measurement method |
| CN109638890A (en) * | 2019-01-22 | 2019-04-16 | 电子科技大学 | A kind of direct-current micro-grid group system and its Novel layered control method |
| CN110323783A (en) * | 2019-07-24 | 2019-10-11 | 阳光电源股份有限公司 | Photovoltaic combining inverter and its control method |
| CN112701720A (en) * | 2020-12-17 | 2021-04-23 | 电子科技大学 | Hybrid control strategy for constant power load of alternating-current micro-mesh belt |
| CN113162045A (en) * | 2021-03-08 | 2021-07-23 | 南京工程学院 | Inverter control method and device containing nonlinear load island microgrid harmonic suppression |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414838A (en) * | 2018-02-06 | 2018-08-17 | 西安交通大学 | A kind of inverter parallel system line impedance measurement method |
| CN108414838B (en) * | 2018-02-06 | 2020-03-17 | 西安交通大学 | Method for measuring line impedance of inverter parallel system |
| CN109638890A (en) * | 2019-01-22 | 2019-04-16 | 电子科技大学 | A kind of direct-current micro-grid group system and its Novel layered control method |
| CN109638890B (en) * | 2019-01-22 | 2022-08-30 | 电子科技大学 | Direct-current micro-grid group system and hierarchical control method thereof |
| CN110323783A (en) * | 2019-07-24 | 2019-10-11 | 阳光电源股份有限公司 | Photovoltaic combining inverter and its control method |
| CN112701720A (en) * | 2020-12-17 | 2021-04-23 | 电子科技大学 | Hybrid control strategy for constant power load of alternating-current micro-mesh belt |
| CN112701720B (en) * | 2020-12-17 | 2022-11-01 | 电子科技大学 | Hybrid control method for constant power load of alternating-current micro-mesh belt |
| CN113162045A (en) * | 2021-03-08 | 2021-07-23 | 南京工程学院 | Inverter control method and device containing nonlinear load island microgrid harmonic suppression |
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