CN106505581B - The compensation method of photovoltaic combining inverter and device - Google Patents
The compensation method of photovoltaic combining inverter and device Download PDFInfo
- Publication number
- CN106505581B CN106505581B CN201611103776.1A CN201611103776A CN106505581B CN 106505581 B CN106505581 B CN 106505581B CN 201611103776 A CN201611103776 A CN 201611103776A CN 106505581 B CN106505581 B CN 106505581B
- Authority
- CN
- China
- Prior art keywords
- power
- reactive
- compensation
- indicate
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 241000208340 Araliaceae Species 0.000 claims 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 2
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 2
- 235000008434 ginseng Nutrition 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- SJWPTBFNZAZFSH-UHFFFAOYSA-N pmpp Chemical compound C1CCSC2=NC=NC3=C2N=CN3CCCN2C(=O)N(C)C(=O)C1=C2 SJWPTBFNZAZFSH-UHFFFAOYSA-N 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H02J3/383—
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention provides a kind of compensation method of photovoltaic combining inverter and devices, wherein this method comprises: determining whether network voltage falls；If the network voltage falls, active power and reactive power are determined by reactive compensation；According to the active power and the reactive power, active compensation and reactive compensation are carried out to the power grid.Single-phase photovoltaic inverter acts on excessively single technical problem caused by the present invention solves existing single-phase photovoltaic inverter only and may be implemented active output, has haved the function that the technical effect of effective extension single-phase photovoltaic inverter.
Description
Technical field
The present invention relates to electric power network technique fields, compensation method and dress in particular to a kind of photovoltaic combining inverter
It sets.
Background technique
Since the 1990s, solar energy generation technology is grown continuously and fast, and parallel network power generation is
One of form is mainly utilized as current solar energy.Core link of the gird-connected inverter as grid-connected system, has become
The research hotspot in the field.
Currently, the control of single-phase photovoltaic inverting system be generally concentrated at make inverter can with output unit power factor, from
And amplitude peak improve grid connection efficiency.That is, the function of single-phase photovoltaic inverter is relatively single.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of compensation methodes of photovoltaic combining inverter, effectively to extend single-phase photovoltaic inversion
The effect of device, this method comprises:
Determine whether network voltage falls；
If the network voltage falls, active power and reactive power are determined by reactive compensation；
According to the active power and the reactive power, active compensation and reactive compensation are carried out to the power grid.
In one embodiment, active power and reactive power are calculated according to the following formula:
Wherein, P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d shaft voltage under rotational coordinates, VqTable
Show the corresponding q shaft voltage under rotational coordinates, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIndicate that mark is instantaneous
Network voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and reactive compensation electric current close
It is formula, k >=2.
In one embodiment, reactive compensation is carried out to the power grid, comprising: current inner loop control is carried out to the power grid
System and outer voltage control.
In one embodiment, current inner loop control is carried out according to following formula:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor the increasing of benchmark resonance
Benefit, krhGain coefficient (h=3,5,7) is controlled for resonance, w0For power grid reference frequency, s indicates the Laplace transform factor.
In one embodiment, outer voltage control is carried out according to following formula:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) wattful power is indicated
PI controller, the G of rateQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*It is represented to
Surely active power, Q are referred to*It indicates given and refers to reactive power.
The embodiment of the invention also provides a kind of compensation devices of photovoltaic combining inverter, inverse effectively to extend single-phase photovoltaic
Become the effect of device, which includes:
Judgment module, for determining whether network voltage falls；
Determining module, for determining that the network voltage there is a situation where falling, determines wattful power by reactive compensation
Rate and reactive power；
Compensating module, for according to the active power and the reactive power, to the power grid carry out active compensation and
Reactive compensation.
In one embodiment, the determining module is specifically used for calculating active power and idle according to the following formula
Power:
Wherein, P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d shaft voltage under rotational coordinates, VqTable
Show the corresponding q shaft voltage under rotational coordinates, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIndicate that mark is instantaneous
Network voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and reactive compensation electric current close
It is formula, k >=2.
In one embodiment, the compensating module to the power grid carry out reactive compensation, comprising: to the power grid into
Row current inner loop control and outer voltage control.
In one embodiment, the compensating module is specifically used for carrying out current inner loop control according to following formula:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor the increasing of benchmark resonance
Benefit, krhGain coefficient (h=3,5,7) is controlled for resonance, w0For power grid reference frequency, s indicates the Laplace transform factor.
In one embodiment, the compensating module is specifically used for carrying out outer voltage control according to following formula:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) wattful power is indicated
PI controller, the G of rateQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*It is represented to
Surely active power, Q are referred to*It indicates given and refers to reactive power.
In the above-described embodiments, a kind of compensation method of photovoltaic combining inverter is provided, voltage occurs in photovoltaic power grid
In the case where falling, carry out reactive compensation, thus solve existing single-phase photovoltaic inverter only and may be implemented active output and
Caused single-phase photovoltaic inverter acts on excessively single technical problem, has haved the function that effective extension single-phase photovoltaic inverter
Technical effect.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is photovoltaic grid-connected inverting system power and control structure block diagram；
Fig. 2 is the method flow diagram of the compensation method of photovoltaic combining inverter according to an embodiment of the present invention；
Fig. 3 is the control block diagram of Photovoltaic Grid Connected Power Conditioner System according to an embodiment of the present invention；
Fig. 4 is the control block diagram of photovoltaic grid-connected inverting system according to an embodiment of the present invention；
Fig. 5 is the structural block diagram of the compensation device of photovoltaic combining inverter according to an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
The function that inventor considers to extend single-phase photovoltaic inverter, so that power grid receives photovoltaic inverse to a greater extent
Become device, can be realized by single-phase photovoltaic inverter for example: low voltage crossing, the miscellaneous functions such as reactive compensation, that is, expand single-phase
Grid-connected no-power compensation function is realized the accurate detection and compensation of the idle and harmonic current of single-phase grid-connected system, is made single-phase
Photovoltaic parallel in system has both idle and harmonic compensation function simultaneously.Three phase reactive power theoretical algorithm is expanded into monophase system
In, realize the reactive compensation of single-phase photovoltaic grid-connected inversion system.
As shown in Figure 1, the control of single-phase photovoltaic inverting system concentrates on making inverter output unit power factor at present, from
And amplitude peak improve grid connection efficiency.In order to enable power grid receives photovoltaic DC-to-AC converter to a greater extent, photovoltaic can be made inverse
Become utensil just like low voltage crossing, the miscellaneous functions such as reactive compensation.Wherein, the reactive compensation of single-phase photovoltaic grid-connected inversion system
Theory is expanded by three phase reactive power theory, and three-phase detection algorithm is mainly used in three-phase equilibrium circuit, single-phase detection
Algorithm both can be applied to single-phase circuit, can also be applied to three-phase equilibrium or unbalanced circuit, thus the scope of application is wider.
For this purpose, in this example, provide a kind of compensation method of photovoltaic combining inverter, as shown in Fig. 2, may include with
Lower step:
Step 201: determining whether network voltage falls；
Step 202: if the network voltage falls, active power and reactive power being determined by reactive compensation；
For photovoltaic combining inverter, control target is that maximum active power is injected to power grid, in the Voltage Drop phase
Between, the power that inverter is output to power grid strongly reduces, and inverter input power will be more than output power at this time, and energy is straight
It is gathered on stream bus, it will increase DC bus-bar voltage, damage electrical component.
It to solve the above-mentioned problems, can be by the way of reactive compensation.As shown in figure 3, under normal circumstances, inverter
For the work of BOOST circuit in MPPT mode, photovoltaic array issues maximum power after BOOST circuit raises voltage, is passed through by inverter
Power grid is arrived after filtering, main control target at this time is that maximum active power is injected to power grid, i.e. control power factor is 1 or nothing
It limits close to 1.When grid voltage sags, active power output valve can be calculated to determine whether BOOST circuit abandons MPPT function
Energy.
It is active and idle can be carried out by control photovoltaic electric current and voltage swing for power regulation output by power-balance
Command voltage.Voltage adjusts output order electric current, by the electric current on detection power grid, carries out reactive compensation and harmonic compensation current
Adjusting obtains grid-connected reference voltage, and reactive compensation can be realized and generate electricity by way of merging two or more grid systems.
Specifically, active power and reactive power can be calculated by the following formula:
Wherein, wherein P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d axis electricity under rotational coordinates
Pressure, VqIndicate the corresponding q shaft voltage under rotational coordinates, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIt indicates
Mark instantaneous network voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and idle benefit
Current relation formula is repaid, i.e., determines reactive compensation size of current, establishing criteria, usual k >=2 by judging network voltage.
Step 103: according to the active power and the reactive power, active compensation and idle benefit being carried out to the power grid
It repays.
Wherein, the control of reactive power compensating may include current inner loop and outer voltage control, wherein current inner loop is used for electric energy
Quality and current protection control, outer voltage is for providing needed for inner ring to constant current.
Specifically, current inner loop control can be carried out according to following formula:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor the increasing of benchmark resonance
Benefit, krhGain coefficient (h=3,5,7) is controlled for resonance, w0For power grid reference frequency, s indicates the Laplace transform factor.
Outer voltage control can be carried out according to following formula:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) wattful power is indicated
PI controller, the G of rateQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*It is represented to
Surely active power, Q are referred to*It indicates given and refers to reactive power.
The compensation method of above-mentioned photovoltaic combining inverter is illustrated below with reference to a specific embodiment, however is worth note
Meaning, the specific embodiment do not constitute improper limitations of the present invention merely to the present invention is better described
The control target of photovoltaic combining inverter is that maximum active power, during Voltage Drop, inversion are injected to power grid
The power that device is output to power grid strongly reduces, and inverter input power will be more than output power at this time, and energy is in DC bus
Upper accumulation, it will increase DC bus-bar voltage, damage electrical component, solve the problems, such as that the most straightforward approach is using idle benefit
Repay strategy.
As shown in figure 3, under normal circumstances, the work of inverter BOOST circuit issues maximum work in MPPT mode, photovoltaic array
Rate is after BOOST circuit raises voltage, and by inverter to power grid after filtering, main control target at this time is to inject to power grid
Maximum active power, i.e. control power factor are 1 or infinite approach 1.When grid voltage sags, active power output valve is calculated
To determine whether BOOST circuit abandons MPPT function.
It is active and idle can be carried out by control photovoltaic electric current and voltage swing for power regulation output by power-balance
Command voltage.Voltage adjusts output order electric current, by the electric current on detection power grid, carries out reactive compensation and harmonic compensation current
Adjusting obtains grid-connected reference voltage, and reactive compensation can be realized and generate electricity by way of merging two or more grid systems.
Photovoltaic Grid Connected Power Conditioner System control block diagram can be as shown in Figure 3 and Figure 4, in order to obtain electric network reactive-load electric current,
Instantaneous reactive power theory is applied into monophase system, orthogonal biphase current and voltage, V can be constructedgα、VgβAnd igα、igβ.Figure
Middle LVRT (Low Voltage Ride-Through) is low voltage crossing, OSG (Orthogonal Signal
It Generation) is orthogonal algorithm, RPC (Reactive Power Compensator) is reactive compensation, Sag Detection
For Voltage Drop detection.Wherein, the control of reactive power compensating includes that current inner loop and outer voltage control, and current inner loop is used for electric energy matter
Amount and current protection control, and outer voltage is for providing needed for inner ring to constant current.
When the grid voltage is normal, active-power P is given*And reactive power Q*Respectively PMPP(maximal power tracing) and 0,
When voltage falls, P is calculated by reactive compensation*And Q*。
In this example, the reactive compensation strategy that constant active power controller can be used, according to orthogonal algorithm, active power
Are as follows:
P=VgId/2
Wherein, VgFor network voltage, IdFor d axis watt current, the I when power grid is normald=In, Vgn、InRespectively power grid is being just
Voltage and current when often, active power is P=P at this timen=VgnIn/2。
By reactive-current compensation it follows that
Wherein, (1-1/k) p.u≤Vg≤ 0.9p.u, p.u are per unit value.In order to normal grid-connected during low voltage crossing,
Following relationship need to be met:
Wherein, ImaxFor the maximum current that inverter allows, active power and reactive power are respectively as follows:
Outer ring voltage control loop section are as follows:
Wherein, vgα、vgβThe respectively quadrature component of network voltage, GP(s)、GQIt (s) is respectively active power and idle function
The PI controller of rate.
Inner ring current control link are as follows:
Inner ring is controlled using ratio resonance and harmonic compensation control, wherein kpFor proportional gain, krFor benchmark resonance gain,
krhGain coefficient (wherein, h=3,5,7) is controlled for resonance, w0For power grid reference frequency.
The control plan of the constant active power of photovoltaic DC-to-AC converter can be used in Voltage Drop for photovoltaic combining inverter
Slightly to realize reactive compensation and harmonic compensation, reduces and waste MPPT output electric current during this period, and MPPT and maximum current output
Coordinated control can be reached, voltage fluctuation can be effectively reduced at the voltage recovery moment.
Based on the same inventive concept, a kind of compensation device of photovoltaic combining inverter is additionally provided in the embodiment of the present invention,
As described in the following examples.The principle and photovoltaic combining inverter solved the problems, such as due to the compensation device of photovoltaic combining inverter
Compensation method it is similar, therefore the implementation of the compensation device of photovoltaic combining inverter may refer to the compensation of photovoltaic combining inverter
The implementation of method, overlaps will not be repeated.Used below, predetermined function may be implemented in term " unit " or " module "
Software and/or hardware combination.Although device described in following embodiment is preferably realized with software, hardware,
Or the realization of the combination of software and hardware is also that may and be contemplated.Fig. 5 is the photovoltaic grid-connected inversion of the embodiment of the present invention
A kind of structural block diagram of the compensation device of device, as shown in figure 5, may include: judgment module 501, determining module 502 and compensation mould
Block 503 is below illustrated the structure.
Judgment module 501, for determining whether network voltage falls；
Determining module 502, for determining that the network voltage there is a situation where falling, determined active by reactive compensation
Power and reactive power；
Compensating module 503, for carrying out active compensation to the power grid according to the active power and the reactive power
And reactive compensation.
In one embodiment, determining module 502 specifically can be used for calculating active power and nothing according to the following formula
Function power:
Wherein, P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d shaft voltage under rotational coordinates, VqTable
Show the corresponding q shaft voltage under rotational coordinates, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIndicate that mark is instantaneous
Network voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and reactive compensation electric current close
It is formula, k >=2.
In one embodiment, compensating module 503 can carry out reactive compensation to the power grid, comprising: to the electricity
Net carries out current inner loop control and outer voltage control.
In one embodiment, compensating module 503 specifically can be used for carrying out current inner loop control according to following formula:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor the increasing of benchmark resonance
Benefit, krhGain coefficient (h=3,5,7) is controlled for resonance, w0For power grid reference frequency, s indicates the Laplace transform factor.
In one embodiment, compensating module 503 specifically can be used for carrying out outer voltage control according to following formula:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) wattful power is indicated
PI controller, the G of rateQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*It is represented to
Surely active power, Q are referred to*It indicates given and refers to reactive power.
It can be seen from the above description that the embodiment of the present invention realizes following technical effect: providing a kind of photovoltaic
The compensation method of gird-connected inverter carries out reactive compensation in the case where Voltage Drop occurs for photovoltaic power grid, to solve existing
Single-phase photovoltaic inverter acts on excessively single technology caused by active output only may be implemented in some single-phase photovoltaic inverters
Problem has reached the technical effect of effective extension single-phase photovoltaic inverter.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of compensation method of photovoltaic combining inverter characterized by comprising
Determine whether network voltage falls；
If the network voltage falls, active power and reactive power are determined by reactive compensation；
According to the active power and the reactive power, active compensation and reactive compensation are carried out to the power grid；
Wherein, active power and reactive power are calculated according to the following formula:
Wherein, P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d shaft voltage under rotational coordinates, VqIndicate rotation
Turn the corresponding q shaft voltage under coordinate, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIt indicates to mark instantaneous power grid
Voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and reactive compensation current relation formula,
k≥2。
2. the method according to claim 1, wherein carrying out reactive compensation to the power grid, comprising:
Current inner loop control and outer voltage control are carried out to the power grid.
3. according to the method described in claim 2, it is characterized in that, carrying out current inner loop control according to following formula:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor benchmark resonance gain,
krhGain coefficient, w are controlled for resonance0For power grid reference frequency, s indicates the Laplace transform factor.
4. according to the method described in claim 2, it is characterized in that, carrying out outer voltage control according to following formula:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) active power is indicated
PI controller, GQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*Indicate given ginseng
Examine active power, Q*It indicates given and refers to reactive power.
5. a kind of compensation device of photovoltaic combining inverter characterized by comprising
Judgment module, for determining whether network voltage falls；
Determining module, for determine the network voltage there is a situation where falling, by reactive compensation determine active power and
Reactive power；
Compensating module carries out active compensation and idle to the power grid for according to the active power and the reactive power
Compensation；
Wherein, the determining module is specifically used for calculating active power and reactive power according to the following formula:
Wherein, P indicates active power, and Q indicates reactive power, VdIndicate the corresponding d shaft voltage under rotational coordinates, VqIndicate rotation
Turn the corresponding q shaft voltage under coordinate, IdIndicate d axis watt current, Iq=k (1-Vg)In, wherein VgIt indicates to mark instantaneous power grid
Voltage, InIndicate that electric current when power grid is normal, k are indicated in low voltage crossing, network voltage and reactive compensation current relation formula,
k≥2。
6. device according to claim 5, which is characterized in that the compensating module carries out reactive compensation to the power grid,
It include: that current inner loop control and outer voltage control are carried out to the power grid.
7. device according to claim 6, which is characterized in that the compensating module is specifically used for carrying out according to following formula
Current inner loop control:
Wherein, Gi(s) control of ratio resonance and harmonic compensation controller, k are indicatedpFor proportional gain, krFor benchmark resonance gain,
krhGain coefficient, w are controlled for resonance0For power grid reference frequency, s indicates the Laplace transform factor.
8. device according to claim 6, which is characterized in that the compensating module is specifically used for carrying out according to following formula
Outer voltage control:
Wherein,Indicate power grid reference current, vgα、vgβThe respectively quadrature component of network voltage, GP(s) active power is indicated
PI controller, GQ(s) indicate that the PI controller of reactive power, P indicate active power, Q indicates reactive power, P*Indicate given ginseng
Examine active power, Q*It indicates given and refers to reactive power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611103776.1A CN106505581B (en) | 2016-12-05 | 2016-12-05 | The compensation method of photovoltaic combining inverter and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611103776.1A CN106505581B (en) | 2016-12-05 | 2016-12-05 | The compensation method of photovoltaic combining inverter and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106505581A CN106505581A (en) | 2017-03-15 |
| CN106505581B true CN106505581B (en) | 2019-01-01 |
Family
ID=58330427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611103776.1A Active CN106505581B (en) | 2016-12-05 | 2016-12-05 | The compensation method of photovoltaic combining inverter and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106505581B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829469B (en) * | 2019-11-29 | 2021-05-04 | 重庆涪陵电力实业股份有限公司 | Power distribution network voltage quality improvement method based on single-phase photovoltaic inverter |
| CN111510009B (en) * | 2020-05-20 | 2021-07-30 | 上海海事大学 | Photovoltaic inverter without leakage current and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013163760A1 (en) * | 2012-05-01 | 2013-11-07 | Rajiv Kumar Varma | Enhanced utilization of real power generating capacity of distributed generator (dg) inverters as statcom |
| CN104269878A (en) * | 2014-07-29 | 2015-01-07 | 西安交通大学 | Low-voltage ride through control method for grid-connected photovoltaic power generation system capable of providing reactive support |
| US20150022006A1 (en) * | 2011-11-25 | 2015-01-22 | Enecsys Limited | Renewable energy power generation systems |
| CN105978042A (en) * | 2016-06-14 | 2016-09-28 | 东南大学 | Fault protection and ride-through control system and method for virtual synchronous machine |
-
2016
- 2016-12-05 CN CN201611103776.1A patent/CN106505581B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150022006A1 (en) * | 2011-11-25 | 2015-01-22 | Enecsys Limited | Renewable energy power generation systems |
| WO2013163760A1 (en) * | 2012-05-01 | 2013-11-07 | Rajiv Kumar Varma | Enhanced utilization of real power generating capacity of distributed generator (dg) inverters as statcom |
| CN104269878A (en) * | 2014-07-29 | 2015-01-07 | 西安交通大学 | Low-voltage ride through control method for grid-connected photovoltaic power generation system capable of providing reactive support |
| CN105978042A (en) * | 2016-06-14 | 2016-09-28 | 东南大学 | Fault protection and ride-through control system and method for virtual synchronous machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106505581A (en) | 2017-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106549417B (en) | A kind of the virtual synchronous generator control method and device of photovoltaic-energy-storage system | |
| CN106410849A (en) | Virtual synchronous generator-based microgrid inverter balance control method | |
| CN104659802B (en) | A kind of VSC-HVDC alternating voltage-frequency coordination control method improving AC system transient stability | |
| CN104377727B (en) | A kind of combining inverter multiple target works in coordination with the unbalance control method of optimization | |
| CN107069809A (en) | A kind of directly driven wind-powered current transformer high voltage crossing control method | |
| JP6043543B2 (en) | Control circuit for controlling inverter circuit and inverter device provided with the control circuit | |
| CN103475029A (en) | Three-phase LCL type grid-connected inverter control system and method based on pole assignment | |
| CN103368191A (en) | Micro-grid multi-inverter parallel voltage unbalanced compensation method | |
| CN104037777B (en) | Distribution Static Compensator suppresses the method for voltage pulsation and harmonic distortion | |
| CN105429166B (en) | A kind of PMSG low voltage ride through system based on idle control | |
| CN110266056A (en) | Based on the independent grid-connected virtual synchronous electricity-generating control method of light storage | |
| CN103904654A (en) | Combined three-phase inverter circuit parallel operation control method | |
| CN108418226A (en) | Open the power-less compensation control method of winding twin inverter photovoltaic generating system | |
| CN109873458A (en) | A kind of method of adjustment and device of reactive current reference value and watt current reference value | |
| CN104950202A (en) | Island detection method and system based on reactive power-frequency positive feedback | |
| CN110112792A (en) | A kind of virtual synchronous machine low voltage crossing control strategy of fast reactive support | |
| CN106505581B (en) | The compensation method of photovoltaic combining inverter and device | |
| CN105186545A (en) | Current balance control method of inverter, and inverter | |
| Sundarabalan et al. | Unified Power Quality Conditioner for Enhancement of Power Quality and Hybrid Power Generation Injection to Grid | |
| CN110429647A (en) | Control method, device and the equipment of photo-voltaic power supply based on positive-negative sequence decoupling control | |
| JP6759972B2 (en) | Resonance suppression device | |
| CN109687745A (en) | A kind of single-phase inverter control method | |
| Sevostyanov et al. | Resonant controllers design for frequency-selective impedance controlled DC microgrids | |
| CN110518624A (en) | A kind of low voltage traversing control method based on photovoltaic combining inverter | |
| CN108123441A (en) | A kind of three-level photovoltaic grid-connected control methods of new NPC |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |