CN107508316A - 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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- CN107508316A CN107508316A CN201710736283.XA CN201710736283A CN107508316A CN 107508316 A CN107508316 A CN 107508316A CN 201710736283 A CN201710736283 A CN 201710736283A CN 107508316 A CN107508316 A CN 107508316A
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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
-
- 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
-
- 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
-
- 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 method, including central global synchronization unit, several global synchronization units and the photovoltaic combining inverter being connected with each photovoltaic battery panel, combining inverter is divided into some 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 operational factor of this group of inverter, and calculates and allow all inverter common mode currents to meet desired phase difference, 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 calculate and allow public grid entry point to inject the phase difference that higher harmonic content is minimum in power network current, and the optimum phase difference that each photovoltaic combining inverter needs perform.
Description
Technical field
The present invention relates to a kind of dual-layer optimization global synchronization variable duration impulse system and method.
Background technology
With the development of Power Electronic Technique, combining inverter is widely used in new energy grid-connected power system.Tradition
Three-phase inverter use sine wave modulation (SPMW) technology more, SPWM can make the output voltage electric current of three-phase inverter for just
String ripple, it ensure that new energy grid-connected power system safety and stability accesses power network, be the important skill in new energy grid-connected power system
Art, but simultaneously, SPWM technologies can make to contain substantial amounts 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 ensures that combining inverter injects electric energy to power network, and common-mode voltage is then
Stray parameter of earth point, grid-connected system with power network etc. forms common mode loop.SPWM can make in common-mode voltage containing big
Radio-frequency component is measured, and larger common mode current is formed in common mode loop, the presence of common mode current does not interfere with combining inverter
To power network Implantation Energy, but the loss of inverter can be increased, have a strong impact on the electric energy conversion efficiency of grid-connected system, also simultaneously
Serious electromagnetic interference can be produced to peripheral equipment.According to the new energy grid connection system standard in China, the maximum of common mode current
400mA is must not exceed, therefore the common-mode voltage of combining inverter, common mode current need to obtain strict control.
The method of traditional suppression common mode voltage mainly has active suppression and passive suppression.It is passive to suppress 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
Dynamic suppression is mainly started with suppression common mode voltage from the control algolithm of inverter, but can increase the control difficulty of combining inverter.It is anxious
Need a kind of method of inexpensive suppression common mode electric current.
Chinese invention patent《Distributed grid-connected inversion system global synchronization variable duration impulse system and method》Disclose 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 combining inverters positioned at diverse geographic location, each combining inverter
It is connected with distributed power source, each combining inverter is connected by public grid entry point with power network, the main control unit and institute
Some combining inverter communication, the main control unit receives the information of each combining inverter, will after determining global synchronization strategy
Global synchronizing signal comprising global synchronization strategy is sent respectively to each combining inverter, and each combining inverter utilizes the overall situation
Synchronizing signal adjusts the pulsewidth modulation wave phase of oneself, with reach disclosure satisfy that between each combining inverter pulse width modulated wave it is humorous
The phase difference that ripple is offset, so as to offset the harmonic current of each combining inverter injection power network.
Chinese invention patent《Distributed grid-connected inversion system global synchronization pulse width phase, frequency dynamic method of adjustment》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 on the premise of grid-connected current harmonic requirement is met, can
Improve the operational efficiency of whole system.
Chinese invention patent《A kind of global synchronization pulsewidth modulation motor synchronizing method under communication failure state》It is proposed a kind of
Global synchronization pulsewidth modulation motor synchronizing method under communication failure state.Inverter can be allowed still to be protected in the case of communication failure
Global synchronization running 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
The common mode current become in device system.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that 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 these goals, the present invention adopts the following technical scheme that：
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, combining inverter are divided into some groups, and every group inverse
Become device by isolating transformer with public grid entry point to be connected, wherein containing a global synchronization unit in each inverter group；
The global synchronization unit, is configured as receiving the operational factor of this group of inverter, and calculates and allow all inversions
Device common mode current meets desired phase difference, the higher hamonic wave under this phase difference in each transformer injection power network current；
The central 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 allows public grid entry point to inject the phase difference that higher harmonic content is minimum in power network current, and
Each photovoltaic combining inverter needs the optimum phase difference performed.
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 said system, comprises the following steps：
Receive the parameter that each inverter is sent, including the power output of inverter, filtering parameter and photovoltaic panel with it is big
Equivalent capacity parameter between ground；
The mathematical modeling of common mode leakage current is calculated according to the parameter of reception, being calculated using intelligent optimization algorithm to allow
Common mode leakage current meets desired phase difference；
Calculate each harmonic value that each transformer injects public grid entry point total current；
The mathematical modeling of total current ripple is calculated according to each harmonic value of total current, and makes total grid-connected current high order humorous
The minimum phase difference of ripple content, the optimum phase difference of each inverter simultaneously feed back to each inverter, carry out each inverter
It is synchronous.
Further, the power output of inverter can be measured by the controller of inverter and obtained, and filter parameter is thought
It is fixed value, has previously been stored in the controller of inverter, equivalent capacity parameter obtains beforehand through measurement, and is stored in inversion
In the controller of device.
Further, the step of calculating common mode current mathematical modeling includes：
Calculate inverter output ripple common-mode voltage, by ripple common-mode voltage represent 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
Become the ripple current of device, obtain the common mode current virtual value of each inverter.
Further, the mathematical modeling progress that the common mode current virtual value of each inverter is calculated using particle cluster algorithm is excellent
Change, to calculate common mode leakage current can be allowed to meet desired phase difference.
Further, the output current of each transformer is expressed as to the harmonic current sum of each frequency, by total current
The harmonic current of each frequency is expressed as multiple transformer output response frequency harmonic current sums, by the harmonic current of total current
The superposition of multiple frequency harmonics electric currents is expressed as, and then obtains the harmonic current virtual value of total current.
The optimum phase difference of each inverter is the phase difference that total grid-connected current higher harmonic content can be allowed minimum with allowing
Common mode leakage current meets desired phase difference sum.
Compared with prior art, beneficial effects of the present invention are：
(1) institute's extracting 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 can effectively to reduce photovoltaic plant output while common mode circulation problem is avoided for institute's extracting method of the present invention
Harmonic content in grid-connected current, improve the output quality of power supply of photovoltaic plant.
(3) common mode loop is eliminated by installing isolating transformer or additional semiconductor device additional compared to traditional combining inverter
The method of stream, on the premise of institute's extracting method of the present invention can meet to require ensureing inverter common mode circulation, reduce inverter
Cost, increase the competitive advantage of inverter.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 dual-layer optimization global synchronization variable duration impulse systems；
Fig. 2 common mode current counting circuit schematic diagrames；
Fig. 3 dual-layer optimization global synchronization pulse-width modulation method flow charts.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with 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 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 singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
In the present invention, term as " on ", " under ", "left", "right", "front", "rear", " vertical ", " level ", " side ",
The orientation or position relationship of instructions such as " bottoms " are based on orientation shown in the drawings or position relationship, only to facilitate describing this hair
Bright each part or component structure relation and the relative determined, not refer in particular to either component or element in the present invention, it is impossible to understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " should be interpreted broadly, and expression can be fixedly connected,
Can also be integrally connected or be detachably connected；Can be joined directly together, can also be indirectly connected by intermediary.For
The related scientific research of this area or technical staff, the concrete meaning of above-mentioned term in the present invention can be determined as the case may be,
It is not considered as limiting the invention.
As background technology is introduced, exist in the prior art the method for suppression common mode voltage mainly have active suppression and
It is passive to suppress.It is passive to suppress 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 is mainly started with suppression common mode voltage from the control algolithm of inverter, but
The deficiency of the control difficulty of combining inverter can be increased, in order to solve technical problem as above, present applicant proposes a kind of double-deck
Optimize global synchronization variable duration impulse system and method.In photovoltaic plant, combining inverter is divided into some 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 operational factor of this group of inverter, and calculate and allow all inverter common mode currents to meet desired phase differenceAnd 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 minimum phase difference of higher harmonic content in site injection power network current For single inverter
Speech, its optimum phase difference for needing to perform areThis method can ensure the common mode current in each inverter group
Meet to require, while allow public grid entry point to inject in the electric current of power network and contain minimum higher hamonic wave.
As shown in figure 1, dual-layer optimization global synchronization variable duration impulse system, including：
Central global synchronization unit Central-GSU, several global synchronization units GSU, substantial amounts of photovoltaic grid-connected inversion
Device.Each photovoltaic combining inverter is connected with photovoltaic battery panel.Substantial amounts of photovoltaic combining inverter is divided into multiple groups, such as Fig. 1
It is shown, if the quantity Q of groupmax, the numbering each organized is designated as Q, wherein Q=1 ..., Qmax.It is multiple grid-connected inverse in each group
It is in parallel and public grid entry point is accessed by isolation boosting transformer to become device, the quantity of photovoltaic combining inverter is set to N in each group,
The numbering 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 single controller or 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 common mode loop of device.
As shown in figure 3, dual-layer optimization global synchronization pulse-width modulation method, comprises the following steps：
Step (1)：GSU receives the parameter that each inverter is sent, including the power output of inverter, filtering parameter, light
Lie prostrate equivalent capacity parameter between plate and the earth etc..
Step (2)：The parameter that GSU receives according to step (1) calculates the mathematical modeling of common mode leakage current.
Step (3)：GSU is calculated using intelligent optimization algorithm can allow common mode leakage current to meet desired phase difference
Step (4)：Calculate each transformer and inject 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)：Calculate the phase difference that total grid-connected current THD can be allowed minimum
Step (7)：The optimum phase difference for calculating each inverter isAnd it is sent to each inverter.
Step (8)：Central-GSU sends synchronizing signal to each GSU, and synchronizing signal is transmitted in this group by GSU
Each inverter.
The power output of inverter can be measured by the controller of inverter and 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 obtain beforehand through measurement, and store
In the controller of inverter.
The step of common mode current mathematical modeling is calculated in step (2) is as follows：
(2-1) calculates the ripple common-mode voltage of inverter output：
Wherein, uM0hFor inverter M output common mode harmonic voltage.uMah、uMbh、uMchRespectively inverter a, b, c three-phases
Harmonic wave of output voltage.
(2-2) by ripple common-mode voltage represent different frequency ripple voltage and：
Wherein, uM0hfThe component for being f for the frequency in inverter M output common mode harmonic voltage.
(2-3) is electric according to the common mode equivalent of Fig. 2 multi-inverter parallel systems under different frequency ripple voltage independent role
Road calculates the ripple current for flowing through each inverter：
Wherein,For the phasor representation form of the M of inverter common mode leakage current virtual value.It is defeated for inverter M
Go out the voltage phasor that frequency in harmonic voltage is f.Represent when frequency is f, inverter i common mode leakage current and inverter j
Output common mode voltage between admittance relation.
(2-4) obtains the common mode current virtual value expression formula of each inverter：
Wherein, IMLRMSRepresent inverter M common mode leakage current virtual value.
GSU, which is calculated using intelligent optimization algorithm, in step (3) can allow common mode leakage current to meet desired phase difference
Step is as follows：
Following mathematical modeling is calculated using particle cluster algorithm to optimize, Optimized model is mathematically represented as：
Step (4) calculates iTQhSpecific formula be：
Wherein iTQH represents inverter group Q total output harmonic wave electric current.
The step (5) calculates the step of total current harmonic wave virtual value and is：
Step (5-1)：The output current of each transformer is expressed as to the harmonic current sum of each frequency：
Wherein, iTQhfRepresent the composition that the frequency in inverter group Q total output harmonic wave current effective value is f.
Step (5-2)：The harmonic current of each frequency of total current is expressed as multiple transformer output response frequency harmonic waves
Electric current sum：
Wherein, isumhfRepresent the composition that whole photovoltaic plant output harmonic wave current intermediate frequency rate is f.
Step (5-3)：The harmonic current of total current is expressed as to the superposition of multiple frequency harmonics electric currents：
Wherein, isumhRepresent whole photovoltaic plant output harmonic wave electric current.
Step (5-4)：Represent the harmonic current virtual value of total current：
Wherein, IsumhRepresent the virtual value of total harmonic current.
Step (6) calculatesMathematical modeling be：
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (9)
1. a kind of dual-layer optimization global synchronization variable duration impulse system, it is characterized in that：Including central global synchronization unit, some
Individual global synchronization unit and the photovoltaic combining inverter being connected with each photovoltaic battery panel, combining inverter are divided into some 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 operational factor of this group of inverter, and calculates and allow all inverters to be total to
Mould electric current meets desired phase difference, the higher hamonic wave under this phase difference in each transformer injection power network current；
The central 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 public grid entry point to inject the phase difference that higher harmonic content is minimum in power network current, and it is each
Photovoltaic combining inverter needs the optimum phase difference performed.
2. a kind of dual-layer optimization global synchronization variable duration impulse system as claimed in claim 1, it is characterized in that：It is central 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 claimed 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 the system as any one of claim 1-3,
It is characterized in that：Comprise the following steps：
The parameter that each inverter is sent is received, including between the power output of inverter, filtering parameter and photovoltaic panel and the earth
Equivalent capacity parameter；
The mathematical modeling of common mode leakage current is calculated according to the parameter of reception, common mode can be allowed by being calculated using intelligent optimization algorithm
Leakage current meets desired phase difference；
Calculate each harmonic value that each transformer injects public grid entry point total current；
The mathematical modeling of total current ripple is calculated according to each harmonic value of total current, and allows total grid-connected current higher hamonic wave to contain
Minimum 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 power output of inverter can pass through the controller of inverter
Measurement obtains, and filter parameter is considered fixed value, had previously been stored in the controller of inverter that equivalent capacity parameter is led in advance
Cross measurement to obtain, and be 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 modeling includes：
Calculate inverter output ripple common-mode voltage, by ripple common-mode voltage represent different frequency ripple voltage and, not
Under same frequency ripple voltage independent role, calculated according to the common mode equivalent circuit of multi-inverter parallel system and flow through each inverter
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：The common mode electricity of each inverter is calculated using particle cluster algorithm
The mathematical modeling of stream virtual value optimizes, and to calculate common mode leakage current can be allowed to meet desired phase difference.
8. modulator approach as claimed in claim 4, it is characterized in that：The output current of each transformer is expressed as each frequency
Harmonic current sum, the harmonic current of each frequency of total current is expressed as multiple transformers and exports response frequency harmonic currents
Sum, the harmonic current of total current is expressed as the superposition of multiple frequency harmonics electric currents, and then obtains the harmonic current of total current
Virtual value.
9. modulator approach as claimed in claim 4, it is characterized in that：The optimum phase difference of each inverter is total grid-connected for that can allow
The minimum phase difference of electric current higher harmonic content and the phase difference sum for allowing common mode leakage current satisfaction to require.
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| PCT/CN2018/081368 WO2019037428A1 (en) | 2017-08-24 | 2018-03-30 | Double-layer optimization global synchronous pulse width modulation system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019037428A1 (en) * | 2017-08-24 | 2019-02-28 | 山东大学 | Double-layer optimization global synchronous pulse width modulation system and method |
| CN111244958A (en) * | 2020-03-12 | 2020-06-05 | 山东大学 | Closed-loop global synchronous pulse width modulation method based on cyclic disturbance observation |
| CN114050597A (en) * | 2021-11-19 | 2022-02-15 | 山东大学 | Cooperative active heat control system and method for multiple grid-connected inverters |
| CN114050597B (en) * | 2021-11-19 | 2024-05-14 | 山东大学 | Cooperative active heat control system and method for multiple grid-connected inverters |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840485A (en) * | 2014-02-28 | 2014-06-04 | 山东大学 | Global synchronization pulse width modulation system and method of distributed grid-connected inverter system |
| CN105610343A (en) * | 2016-03-07 | 2016-05-25 | 合肥工业大学 | Modulation method for inhibiting leakage current of H-bridge cascade inverters |
| CN105871239A (en) * | 2016-04-29 | 2016-08-17 | 阳光电源股份有限公司 | Method for suppressing leakage current of cascade multi-level inverter and inverter |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5255851B2 (en) * | 2008-01-21 | 2013-08-07 | 山洋電気株式会社 | Parallel operation inverter |
| CN102638038B (en) * | 2012-03-20 | 2014-03-05 | 华中科技大学 | Parallel charging and discharging power conversion system |
| CN102882206B (en) * | 2012-08-28 | 2015-12-16 | 中国电力科学研究院 | A kind of multistage grid control method based on four-dimensional energy management space |
| JP6421494B2 (en) * | 2014-08-22 | 2018-11-14 | オムロン株式会社 | Control device, power conversion device, power system, and control method |
| CN105515045A (en) * | 2015-12-25 | 2016-04-20 | 国家电网公司 | Multi agent-based power transmission and distribution network and distributed type supply source coordinated control system and method |
| CN106505603B (en) * | 2016-11-23 | 2019-11-22 | 国网辽宁省电力有限公司电力科学研究院 | A kind of layering energy storage micro-capacitance sensor comprising multiple energy-storage units |
| CN107508316B (en) * | 2017-08-24 | 2019-04-16 | 山东大学 | Dual-layer optimization global synchronization variable duration impulse system and method |
-
2017
- 2017-08-24 CN CN201710736283.XA patent/CN107508316B/en active Active
-
2018
- 2018-03-30 WO PCT/CN2018/081368 patent/WO2019037428A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840485A (en) * | 2014-02-28 | 2014-06-04 | 山东大学 | Global synchronization pulse width modulation system and method of distributed grid-connected inverter system |
| CN105610343A (en) * | 2016-03-07 | 2016-05-25 | 合肥工业大学 | Modulation method for inhibiting leakage current of H-bridge cascade inverters |
| CN105871239A (en) * | 2016-04-29 | 2016-08-17 | 阳光电源股份有限公司 | Method for suppressing leakage current of cascade multi-level inverter and inverter |
Non-Patent Citations (2)
| Title |
|---|
| 赵涛: "级联H桥光伏逆变器关键技术研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
| 闫海云等: "级联非隔离光伏发电系统漏电流抑制方法", 《电气传动》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019037428A1 (en) * | 2017-08-24 | 2019-02-28 | 山东大学 | Double-layer optimization global synchronous pulse width modulation system and method |
| CN111244958A (en) * | 2020-03-12 | 2020-06-05 | 山东大学 | Closed-loop global synchronous pulse width modulation method based on cyclic disturbance observation |
| CN114050597A (en) * | 2021-11-19 | 2022-02-15 | 山东大学 | Cooperative active heat control system and method for multiple grid-connected inverters |
| CN114050597B (en) * | 2021-11-19 | 2024-05-14 | 山东大学 | Cooperative active heat control system and method for multiple grid-connected inverters |
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| WO2019037428A1 (en) | 2019-02-28 |
| CN107508316B (en) | 2019-04-16 |
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