CN107508316B - Dual-layer optimization global synchronization variable duration impulse system and method - Google Patents
Dual-layer optimization global synchronization variable duration impulse system and method Download PDFInfo
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- CN107508316B CN107508316B CN201710736283.XA CN201710736283A CN107508316B CN 107508316 B CN107508316 B CN 107508316B CN 201710736283 A CN201710736283 A CN 201710736283A CN 107508316 B CN107508316 B CN 107508316B
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
-
- 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
Abstract
The invention discloses a kind of dual-layer optimization global synchronization variable duration impulse system and methods, including central global synchronization unit, several global synchronization units and the photovoltaic combining inverter being connected with each photovoltaic battery panel, gird-connected inverter is divided into several groups, every group of inverter is connected by isolating transformer with public grid entry point, wherein containing a global synchronization unit in each inverter group；Global synchronization unit is configured as receiving the operating parameter of this group of inverter, and calculates the phase difference for allowing all inverter common mode currents to meet the requirements, the higher hamonic wave under this phase difference in each transformer injection power network current；Central global synchronization unit, it is configured as receiving this inverter group total current higher hamonic wave information of each global synchronization unit transmission, and it calculates and public grid entry point is allowed to inject the optimum phase difference that the smallest phase difference of higher harmonic content and each photovoltaic combining inverter need to be implemented in power network current.
Description
Technical field
The present invention relates to a kind of dual-layer optimization global synchronization variable duration impulse system and methods.
Background technique
With the development of power electronics technology, gird-connected inverter is widely used in new energy grid-connected power system.Tradition
Three-phase inverter mostly use sine wave modulation (SPMW) technology, SPWM can make the output voltage electric current of three-phase inverter be positive
String wave ensure that new energy grid-connected power system safety and stability accesses power grid, be the important skill in new energy grid-connected power system
Art, but simultaneously, SPWM technology can make to contain a large amount of radio-frequency component in the output voltage of inverter.The output voltage of inverter can
To be divided into differential mode voltage and common-mode voltage part, differential mode voltage guarantees that gird-connected inverter injects electric energy to power grid, and common-mode voltage is then
Common mode circuit is formed with the grounding point of power grid, the stray parameter of grid-connected system etc..SPWM can make in common-mode voltage containing big
Radio-frequency component is measured, and forms biggish common mode current in common mode circuit, the presence of common mode current will not influence gird-connected inverter
It to power grid Implantation Energy, but will increase the loss of inverter, seriously affect the electric energy conversion efficiency of grid-connected system, simultaneously also
Serious electromagnetic interference can be generated to peripheral equipment.According to the new energy grid connection system standard in China, the maximum value of common mode current
It must not exceed 400mA, therefore the common-mode voltage of gird-connected inverter, common mode current need to obtain stringent control.
The method of traditional inhibition common-mode voltage mainly has active suppression and passive inhibition.It is passive to inhibit to include using common mode
Inductance, common mode inhibition transformer, common-mode filter and common mode choke coil etc., these methods are required to increase hardware cost；It is main
It is dynamic to inhibit the control difficulty for inhibiting common-mode voltage, but will increase gird-connected inverter of mainly starting with from the control algolithm of inverter.It is anxious
The method for needing a kind of inhibition common mode current of low cost.
Chinese invention patent " distributed grid-connected inversion system global synchronization variable duration impulse system and method " discloses one kind
Distributed grid-connected inversion system global synchronization variable duration impulse system, it is determined that the basic structure of global variable duration impulse system, including
Main control unit (global synchronization unit) and several gird-connected inverters positioned at diverse geographic location, each gird-connected inverter
It is connect with distributed generation resource, each gird-connected inverter is connect by public grid entry point with power grid, the main control unit and institute
Some gird-connected inverter communication, the main control unit receives the information of each gird-connected inverter, will after determining global synchronization strategy
Global synchronizing signal comprising global synchronization strategy is sent respectively to each gird-connected inverter, and each gird-connected inverter utilizes the overall situation
Synchronization signal adjusts the pulsewidth modulation wave phase of oneself, with reach can satisfy between each gird-connected inverter pulse width modulated wave it is humorous
The phase difference that wave is offset, to offset the harmonic current of each gird-connected inverter injection power grid.
Chinese invention patent " distributed grid-connected inversion system global synchronization pulse width phase, frequency dynamic method of adjustment " is upper
On the basis of stating patent, a kind of distributed grid-connected inversion system global synchronization pulse width phase, frequency dynamic method of adjustment are disclosed, it is inverse
Become in device normal course of operation, each inverter switching frequency is reduced under the premise of meeting grid-connected current harmonic requirement, it can
Improve the operational efficiency of whole system.
Chinese invention patent " a kind of communication failure state under global synchronization pulsewidth modulation motor synchronizing method " proposes one kind
Global synchronization pulsewidth modulation motor synchronizing method under communication failure state.Inverter can be allowed still to protect in the case where communication failure
Global synchronization operating status is held, the state of each inverter gives full play to the excellent of global synchronization pulse duration modulation method without change
Gesture.
But existing patent and document do not propose how inverse using global synchronization pulse-width modulation method reduction multi-parallel
Become the common mode current in device system.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of dual-layer optimization global synchronization variable duration impulse system and side
Method, the present invention can effectively avoid common mode circulation problem in large-scale photovoltaic power station, improve the transformation efficiency of photovoltaic combining inverter.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of dual-layer optimization global synchronization variable duration impulse system, including central global synchronization unit, several overall situations
Synchronization unit and the photovoltaic combining inverter being connected with each photovoltaic battery panel, gird-connected inverter are divided into several groups, and every group inverse
Become device to be connected by isolating transformer with public grid entry point, wherein containing a global synchronization unit in each inverter group；
The global synchronization unit is configured as receiving the operating parameter of this group of inverter, and calculates and allow all inversions
The phase difference that device common mode current is met the requirements, the higher hamonic wave under this phase difference in each transformer injection power network current；
The center global synchronization unit, this inverter group for being configured as receiving each global synchronization unit transmission are always electric
Higher hamonic wave information is flowed, and calculates and public grid entry point is allowed to inject the smallest phase difference of higher harmonic content in power network current, and
The optimum phase difference that each photovoltaic combining inverter needs to be implemented.
Further, the central global synchronization unit is configured with total current ripple Optimization Calculation Program.
Further, the global synchronization unit is configured with the flow-optimized calculation procedure of common mode loop for this group of inverter.
Dual-layer optimization global synchronization pulse-width modulation method based on above system, comprising the following steps:
The parameter that each inverter is sent is received, output power, filtering parameter and photovoltaic panel including inverter and big
Equivalent capacity parameter between ground；
Parameter calculates the mathematical model of common mode leakage current based on the received, and being calculated using intelligent optimization algorithm can allow
The phase difference that common mode leakage current is met the requirements；
Calculate each harmonic value that each transformer injects public grid entry point total current；
The mathematical model of total current ripple is calculated according to each harmonic value of total current, and makes total grid-connected current high order humorous
The smallest phase difference of wave content, the optimum phase difference of each inverter simultaneously feed back to each inverter, carry out each inverter
It is synchronous.
Further, the output power of inverter can be measured by the controller of inverter and be obtained, and filter parameter is thought
It is fixed value, has previously been stored in the controller of inverter, equivalent capacity parameter first passes through measurement in advance and obtains, and is stored in inversion
In the controller of device.
Further, the step of calculating common mode current mathematical model includes:
Calculate inverter output ripple common-mode voltage, by ripple common-mode voltage indicate different frequency ripple voltage and,
Under different frequency ripple voltage independent role, flowed through according to the calculating of the common mode equivalent circuit of multi-inverter parallel system each inverse
The ripple current for becoming device, obtains the common mode current virtual value of each inverter.
Further, the mathematical model progress that the common mode current virtual value of each inverter is calculated using particle swarm algorithm is excellent
Change, to calculate the phase difference that common mode leakage current can be allowed to meet the requirements.
Further, the output electric current of each transformer is expressed as to the sum of the harmonic current of each frequency, by total current
The harmonic current of each frequency is expressed as the sum of multiple transformer output response frequency harmonics electric currents, by the harmonic current of total current
It is expressed as the superposition of multiple frequency harmonics electric currents, and then obtains the harmonic current virtual value of total current.
The optimum phase difference of each inverter be can allow total the smallest phase difference of grid-connected current higher harmonic content with allow
The sum of the phase difference that common mode leakage current is met the requirements.
Compared with prior art, the invention has the benefit that
(1) the mentioned method of the present invention can effectively avoid common mode circulation problem in large-scale photovoltaic power station, improve grid-connected
The transformation efficiency of inverter.
(2) it is total to can be effectively reduced photovoltaic plant output while avoiding common mode circulation problem for the mentioned method of the present invention
Harmonic content in grid-connected current improves the output power quality of photovoltaic plant.
(3) common mode loop is eliminated by installing isolating transformer or additional semiconductor device additional compared to traditional gird-connected inverter
The method of stream, the mentioned method of the present invention can reduce inverter under the premise of guaranteeing that inverter common mode circulation is met the requirements
Cost increases the competitive advantage of inverter.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 dual-layer optimization global synchronization variable duration impulse system；
Fig. 2 common mode current counting circuit schematic diagram；
Fig. 3 dual-layer optimization global synchronization pulse-width modulation method flow chart.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
As background technique is introduced, exist in the prior art inhibit the method for common-mode voltage mainly have active suppression and
It is passive to inhibit.It is passive to inhibit to include using common mode inductance, common mode inhibition transformer, common-mode filter and common mode choke coil etc.,
These methods are required to increase hardware cost；Active suppression mainly starts with from the control algolithm of inverter and inhibits common-mode voltage, but
It will increase the deficiency of the control difficulty of gird-connected inverter, in order to solve technical problem as above, present applicant proposes a kind of bilayers
Optimize global synchronization variable duration impulse system and method.In photovoltaic plant, gird-connected inverter is divided into several groups, every group
Inverter is connected by isolating transformer with public grid entry point, wherein containing a global synchronization unit in each inverter group
GSU, GSU receive the operating parameter of this group of inverter, and calculate the phase difference for allowing all inverter common mode currents to meet the requirementsAnd the higher hamonic wave under this phase difference in each transformer injection power network current.It is central global
Synchronization unit Central-GSU receive GSU transmission this inverter group total current higher hamonic wave information, and calculate allow it is public simultaneously
The smallest phase difference of higher harmonic content in power network current is injected in site For single inverter
Speech, the optimum phase difference needed to be implemented areThis method can guarantee the common mode current in each inverter group
It meets the requirements, while allowing public grid entry point to inject and containing least higher hamonic wave in the electric current of power grid.
As shown in Figure 1, dual-layer optimization global synchronization variable duration impulse system, comprising:
Central global synchronization unit Central-GSU, several global synchronization units GSU, a large amount of photovoltaic grid-connected inversion
Device.Each photovoltaic combining inverter is connected with photovoltaic battery panel.A large amount of photovoltaic combining inverter is divided into multiple groups, such as Fig. 1
It is shown, if the quantity Q of groupmax, each group of number is denoted as Q, wherein Q=1 ..., Qmax.It is multiple grid-connected inverse in each group
Becoming device parallel connection and public grid entry point is accessed by isolation boosting transformer, the quantity of photovoltaic combining inverter is set to N in each group,
The number of inverter is set to M (M=1 ..., N).Central-GSU is communicated with all GSU, GSU with it is all inverse in this group
Become device to be communicated.Central-GSU and GSU can be individual controller, be also possible to be present in some inverter control
Partial function in device.Total current ripple Optimization Calculation Program is added in Central-GSU, is added in GSU and is directed to this group of inversion
The flow-optimized calculation procedure of the common mode loop of device.
As shown in figure 3, dual-layer optimization global synchronization pulse-width modulation method, comprising the following steps:
Step (1): GSU receives the parameter that each inverter is sent, output power, filtering parameter, light including inverter
Lie prostrate the equivalent capacity parameter etc. between plate and the earth.
Step (2): GSU calculates the mathematical model of common mode leakage current according to step (1) received parameter.
Step (3): GSU calculates the phase difference that common mode leakage current can be allowed to meet the requirements using intelligent optimization algorithm
Step (4): it calculates each transformer and injects public grid entry point total current iTQEach harmonic value iTQhAnd it is sent to
Central-GSU。
Step (5): Central-GSU receives the i that each GSU is sentTQhAnd calculate the mathematical modulo of total current ripple
Type.
Step (6): total the smallest phase difference of grid-connected current THD can be allowed by calculating
Step (7): the optimum phase difference for calculating each inverter isAnd it is sent to each inverter.
Step (8): Central-GSU sends synchronization signal to each GSU, and synchronization signal is transmitted in this group by GSU
Each inverter.
The output power of inverter can be measured by the controller of inverter and be obtained in step (1).Filter parameter is thought
It is fixed value, can has previously been stored in the controller of inverter.Equivalent capacity parameter can first pass through measurement in advance and obtain, and store
In the controller of inverter.
The step of common mode current mathematical model is calculated in step (2) is as follows:
(2-1) calculates the ripple common-mode voltage of inverter output:
Wherein, uM0hFor the output common mode harmonic voltage of inverter M.uMah、uMbh、uMchRespectively inverter a, b, c three-phase
Harmonic wave of output voltage.
(2-2) by ripple common-mode voltage indicate different frequency ripple voltage and:
Wherein, uM0hfThe component for being f for the frequency in the output common mode harmonic voltage of inverter M.
(2-3) under different frequency ripple voltage independent role, the common mode equivalent of multi-inverter parallel system is electric according to fig. 2
Road calculates the ripple current for flowing through each inverter:
Wherein,For the phasor representation form of the common mode leakage current virtual value of the M of inverter.It is defeated for inverter M
The voltage phasor that frequency is f in harmonic voltage out.It indicates when frequency is f, the common mode leakage current and inverter j of inverter i
Output common mode voltage between admittance relationship.
(2-4) obtains the common mode current virtual value expression formula of each inverter:
Wherein, IMLRMSIndicate the common mode leakage current virtual value of inverter M.
GSU calculates the phase difference that common mode leakage current can be allowed to meet the requirements using intelligent optimization algorithm in step (3)
Steps are as follows:
It calculates following mathematical model using particle swarm algorithm to optimize, the mathematical expression of Optimized model are as follows:
Step (4) calculates iTQhSpecific formula are as follows:
Wherein iTQTotal output harmonic wave electric current of h expression inverter group Q.
The step (5) calculates the step of total current harmonic wave virtual value are as follows:
Step (5-1): the output electric current of each transformer is expressed as to the sum of the harmonic current of each frequency:
Wherein, iTQhfIndicate the ingredient that the frequency in total output harmonic wave current effective value of inverter group Q is f.
Step (5-2): the harmonic current of each frequency of total current is expressed as multiple transformer output response frequency harmonics
The sum of electric current:
Wherein, isumhfIndicate that entire photovoltaic plant output harmonic wave current intermediate frequency rate is the ingredient of f.
Step (5-3): the harmonic current of total current is expressed as to the superposition of multiple frequency harmonics electric currents:
Wherein, isumhIndicate entire photovoltaic plant output harmonic wave electric current.
Step (5-4): the harmonic current virtual value of total current is represented:
Wherein, IsumhIndicate the virtual value of total harmonic current.
Step (6) calculatesMathematical model are as follows:
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (8)
1. a kind of dual-layer optimization global synchronization variable duration impulse system, it is characterized in that: including central global synchronization unit, several
A global synchronization unit and the photovoltaic combining inverter being connected with each photovoltaic battery panel, gird-connected inverter are divided into several groups,
Every group of inverter is connected by isolating transformer with public grid entry point, wherein containing a global synchronization list in each inverter group
Member；
The global synchronization unit is configured as receiving the operating parameter of this group of inverter, and calculates and make all inverters total
The phase difference that mould electric current is met the requirements, the higher hamonic wave under this phase difference in each isolating transformer injection power network current；
The center global synchronization unit, this inverter group total current for being configured as receiving each global synchronization unit transmission are high
Subharmonic information, and calculate and allow in public grid entry point injection power network current the smallest phase difference of higher harmonic content and each
The optimum phase difference that photovoltaic combining inverter needs to be implemented；
Wherein, the optimum phase difference of each inverter be can allow total the smallest phase difference of grid-connected current higher harmonic content with allow
The sum of the phase difference that common mode leakage current is met the requirements.
2. a kind of dual-layer optimization global synchronization variable duration impulse system as described in claim 1, it is characterized in that: center is global
Synchronization unit is configured with total current ripple Optimization Calculation Program.
3. a kind of dual-layer optimization global synchronization variable duration impulse system as described in claim 1, it is characterized in that: the overall situation
Synchronization unit is configured with the flow-optimized calculation procedure of common mode loop for this group of inverter.
4. the dual-layer optimization global synchronization pulse-width modulation method based on system as claimed in any one of claims 1-3,
It is characterized in that: the following steps are included:
The parameter that each inverter is sent is received, output power, filtering parameter and photovoltaic battery panel including inverter and big
Equivalent capacity parameter between ground；
Parameter calculates the mathematical model of common mode leakage current based on the received, and common mode can be allowed by being calculated using intelligent optimization algorithm
The phase difference that leakage current is met the requirements；
Calculate each harmonic value that each isolating transformer injects public grid entry point total current；
The mathematical model of total current ripple is calculated according to each harmonic value of total current, and total grid-connected current higher hamonic wave is allowed to contain
The smallest phase difference is measured, the optimum phase difference of each inverter simultaneously feeds back to each inverter, carries out the synchronization of each inverter.
5. modulator approach as claimed in claim 4, it is characterized in that: the output power of inverter is surveyed by the controller of inverter
Amount obtains, and filter parameter is considered fixed value, has previously been stored in the controller of inverter that equivalent capacity parameter first passes through in advance
Measurement obtains, and is stored in the controller of inverter.
6. modulator approach as claimed in claim 4, it is characterized in that: the step of calculating common mode current mathematical model includes:
Calculate inverter output ripple common-mode voltage, by ripple common-mode voltage indicate different frequency ripple voltage and, not
Under same frequency ripple voltage independent role, each inverter is flowed through according to the calculating of the common mode equivalent circuit of multi-inverter parallel system
Ripple current, obtain the common mode current virtual value of each inverter.
7. modulator approach as claimed in claim 4, it is characterized in that: calculating the common mode electricity of each inverter using particle swarm algorithm
The mathematical model of stream virtual value optimizes, to calculate the phase difference that common mode leakage current can be allowed to meet the requirements.
8. modulator approach as claimed in claim 4, it is characterized in that: the output electric current of each isolating transformer is expressed as each
The harmonic current of each frequency of total current is expressed as multiple isolating transformer output response frequencies by the sum of harmonic current of frequency
The harmonic current of total current, is expressed as the superposition of multiple frequency harmonics electric currents by the sum of harmonic current, and then obtains total current
Harmonic current virtual value.
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