CN103647470A - Three-phase NPC grid-connected inverter based on repeated control - Google Patents
Three-phase NPC grid-connected inverter based on repeated control Download PDFInfo
- Publication number
- CN103647470A CN103647470A CN201310684101.0A CN201310684101A CN103647470A CN 103647470 A CN103647470 A CN 103647470A CN 201310684101 A CN201310684101 A CN 201310684101A CN 103647470 A CN103647470 A CN 103647470A
- Authority
- CN
- China
- Prior art keywords
- phase
- module
- inverter
- npc
- controller
- 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.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses a three-phase NPC photovoltaic grid-connected inverter based on repeated control. The inverter is based on an NPC topology structure. A system is composed of an LC filter module, a Clark/Park transformation module, a d-axis current regulator, a q-axis current regulator, a composite controller, a Clark/Park inverse transformation module and an SVPWM space vector module, wherein the composite controller is formed by connecting a PI controller and a repetition controller in parallel. Since system grid connection is needed, the reference signal of the q-axis current regulator is zero. Compared to the prior art, the inverter provided by the invention can realize inverter unit power factor grid-connected operation, can effectively inhibit periodical interference in a photovoltaic system at the same time, and can improve the system stability and reliability.
Description
Technical field
The invention belongs to power electronics and use field, relate to a kind of inverter, relate in particular to a kind of three-phase NPC photovoltaic combining inverter based on repeating to control.
Background technology
Along with social development, the progress of science and technology, the resource that the mankind consume is more and more, and global energy crisis and problem of environmental pollution are day by day serious.Solar energy cleaning, practical, the advantage such as be easy to large-scale develop and utilize and be more and more subject to everybody and pay attention to.In photovoltaic system, inverter is the key factor that determines output waveform quality, and three level diode clamp types (Neutral Point Clamped, NPC) inverter has with respect to two-level inverter, switching frequency is high, device bears the advantages such as voltage is low, output voltage waveforms good, output harmonic wave is little.
The combining inverter based on repeating to control that the present invention proposes is mainly to expand based on three level NPC topological structures; And the control strategy most crucial technology that is inverter.Although traditional PI controls the response speed that can improve system, guarantee to a certain extent the stable of output current; But the impact that is subject to the periodic disturbances such as dead time effect, nonlinear load due to photovoltaic system, causes system output current wave second-rate.
Summary of the invention
For above-mentioned reasons, reduced the quality of inverter output waveforms, so the present invention proposes a kind of three-phase NPC combining inverter based on repeating to control.The inverter that the inverter that the present invention proposes only adopts PI to control than tradition has better stability, and output waveform quality is higher.
The present invention is by the following technical solutions:
A three-phase NPC combining inverter based on repeating to control, for photovoltaic system.Inverter control circuit comprises Clark/Park conversion, composite controller, decoupling zero module, feed-forward module, Clark/Park inverse transformation, the phase-locked module of PLL and SVPWM space vector modulation module, wherein, composite controller consists of PI controller and repetitive controller parallel connection.During combining inverter operation, the voltage of sampling three-phase electrical network is undertaken phase-locked by the phase-locked module of PLL, obtains voltage-phase and frequency signal given as phase place and the frequency of grid-connected current; The electric current of sampling three-phase electrical network, is converted and is obtained d axle and q shaft current by Clark/Park, with given grid-connected current benchmark simultaneously
i d * ,
i q * through composite controller, do compound adjusting, result after adjusting is through decoupling zero module and feed-forward module, by Clark/Park inverse transformation and SVPWM space vector modulation module, obtain duty cycle signals again and drive three-phase NPC inverter, the output of three-phase NPC inverter after filtering device is connected with three phase network.In inverter whole service process, the Repetitive Control Technique based on internal model principle can suppress PERIODIC INTERFERENCE effectively.
The invention has the beneficial effects as follows:
By emulation, find, only use PI to control, grid-connected current harmonic wave is larger, and total percent harmonic distortion is greater than 5%, and effect is poor; Only use while repeating to control, some disturbing as aperiodicity, can make harmonic wave become large on the contrary; When using PI and repeating the composite control method of control, grid-connected current harmonic wave is little, and total percent harmonic distortion is less than 3%, and from grid-connected effect, inverter power factor is 96.5%, and the quality of power supply meets the grid-connected standard that requires of country completely.
Comprehensively above-mentioned, a kind of NPC combining inverter based on repeating to control that the present invention proposes is compared with the combining inverter that tradition only adopts PI to control, and system is more stable, and waveform quality is higher.
Accompanying drawing explanation
The systematic schematic diagram of the three-phase NPC combining inverter based on repeating to control that Fig. 1 the present invention proposes;
The three level NPC topological structures that Fig. 2 the present invention proposes;
The repetitive controller schematic diagram that Fig. 3 the present invention proposes;
The compound control structure figure that Fig. 4 the present invention proposes.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Of low quality in order to solve traditional combining inverter output waveform, the problem that stability is bad, the present invention proposes a kind of three-phase NPC combining inverter based on repeating to control, whole system principle as shown in Figure 1, in Fig. 1, during combining inverter operation, the voltage of sampling three-phase electrical network is undertaken phase-locked by the phase-locked module of PLL, obtains voltage-phase and frequency signal given as phase place and the frequency of grid-connected current; The electric current of sampling three-phase electrical network, is converted and is obtained d axle and q shaft current by Clark/Park, with given grid-connected current benchmark simultaneously
i d * ,
i q * through composite controller, do compound adjusting, result after adjusting is through decoupling zero module and feed-forward module, by Clark/Park inverse transformation and SVPWM space vector modulation module, obtain duty cycle signals again and drive three-phase NPC inverter, the output of three-phase NPC inverter after filtering device is connected with three phase network.
Main circuit topological structure of the present invention as shown in Figure 2.In Fig. 2, have 12 IGBT switching tubes, form respectively three-phase brachium pontis, inverter output is connected with electrical network after LC filtering.
Be the schematic diagram of repetitive controller as shown in Figure 3, in figure, r is sinusoidal reference signal, and y is inverter output voltage, and e is error signal, and d is equivalent periodic disturbance, and P (z) is control object.Repetitive controller is by internal mold, and compensator C (z) forms, and N is the sampling number of a primitive period, and in figure, square frame is partly repeating signal generator internal mold.Desirable repetitive controller Q (z)=1, when the angular frequency d of disturbance is the integral multiple of input signal angular frequency r, during ω d=n ω r, can obtain z-N=1.Therefore, desirable repetitive controller can be eliminated any subharmonic, can carry out indifference tracking to being less than any subharmonic of 1/2 of sample frequency.
Fig. 4 is the repetitive controller schematic diagram that the present invention proposes, in Fig. 4, pi regulator is in parallel with repetitive controller, adding the not impact of the parameter of pi regulator of repetitive controller, repeat to control and can effectively suppress PERIODIC INTERFERENCE, but because repetitive controller exists delay link, cause dynamic response slow; And PI control dynamic response is fast, but can not control well output waveform stability; Therefore by the composite control method of both combinations, not only dynamic response is fast, and output waveform quality is improved.
By emulation, find: grid-connected current harmonic wave is little, total percent harmonic distortion is less than 3%, from grid-connected effect, and inverter power factor 96.5%, the quality of power supply meets the grid-connected standard that requires of country completely.
Claims (3)
1. the three-phase NPC photovoltaic combining inverter based on repeating to control, comprise three-phase NPC inverter 10, filter 11, inverter control module and three phase network 12, it is characterized in that: described inverter control module comprises Clark/Park conversion 1, composite controller 2, decoupling zero module 3, feed-forward module 4, Clark/Park inverse transformation 5, the phase-locked module 6 of PLL and SVPWM space vector modulation module 7; Described composite controller 2 consists of PI controller 8 and repetitive controller 9 parallel connections; During combining inverter operation, the voltage of sampling three-phase electrical network 12 is undertaken phase-locked by the phase-locked module 6 of PLL, obtains voltage-phase and frequency signal given as phase place and the frequency of grid-connected current; The electric current of sampling three-phase electrical network 12, converts 1 by Clark/Park and obtains d axle and q shaft current, with given grid-connected current benchmark simultaneously
i d * ,
i q * through composite controller 2, do compound adjusting, result after adjusting is through decoupling zero module 3 and feed-forward module 4, by Clark/Park inverse transformation 5 and SVPWM space vector modulation module 7, obtain duty cycle signals again and drive three-phase NPC inverter 10, the output of three-phase NPC inverter 10 after filtering device 11 is connected with three phase network 12.
2. a kind of three-phase NPC photovoltaic combining inverter based on repeating to control according to claim 1, is characterized in that: described SVPWM space vector modulation module 7 adopts nine sections of method SVPWM modulation.
3. a kind of three-phase NPC photovoltaic combining inverter based on repeating to control according to claim 1, is characterized in that: the angular frequency in described decoupling zero module 3 equates with the angular frequency in three phase network 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310684101.0A CN103647470B (en) | 2013-12-09 | 2013-12-09 | A kind of three-phase NPC photovoltaic combining inverter based on Repetitive controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310684101.0A CN103647470B (en) | 2013-12-09 | 2013-12-09 | A kind of three-phase NPC photovoltaic combining inverter based on Repetitive controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103647470A true CN103647470A (en) | 2014-03-19 |
| CN103647470B CN103647470B (en) | 2016-01-20 |
Family
ID=50252647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310684101.0A Expired - Fee Related CN103647470B (en) | 2013-12-09 | 2013-12-09 | A kind of three-phase NPC photovoltaic combining inverter based on Repetitive controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103647470B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986458A (en) * | 2014-04-16 | 2014-08-13 | 国家电网公司 | Micro-grid single-phase grid-connection phase-locked loop control method based on repetition control |
| CN104201922A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Clamping-type three-phase voltage-source type inverter and control method thereof |
| CN105610311A (en) * | 2016-01-21 | 2016-05-25 | 北京京仪绿能电力系统工程有限公司 | Method and device for harmonic suppression of photovoltaic inverter |
| CN107204630A (en) * | 2017-06-09 | 2017-09-26 | 湖南大学 | Have the island NPC type power supply high-accuracy control methods of fast dynamic response concurrently |
| CN108512250A (en) * | 2018-04-24 | 2018-09-07 | 安徽工业大学 | A kind of Three-phase high-power photovoltaic combining inverter and the repetitive control for reducing its output current THD |
| CN108631361A (en) * | 2018-05-07 | 2018-10-09 | 上海电力学院 | A kind of LC types three-phase grid-connected inverter control method |
| CN109150048A (en) * | 2018-09-17 | 2019-01-04 | 哈尔滨理工大学 | A kind of permanent magnet synchronous motor multiplex control system of position-sensor-free |
| CN113300613A (en) * | 2021-05-25 | 2021-08-24 | 武汉大学 | Switch type power amplifier based on parallel interleaved multi-level converter and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950983A (en) * | 2010-10-08 | 2011-01-19 | 天津理工大学 | Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN103337875A (en) * | 2013-06-17 | 2013-10-02 | 合肥工业大学 | Composite control method for grid-connected inverter based on repetitive control and disturbance observer |
| CN103346688A (en) * | 2013-06-24 | 2013-10-09 | 合肥工业大学 | Controlling method of improving current quality of grid-connected inverter during low-load operation |
-
2013
- 2013-12-09 CN CN201310684101.0A patent/CN103647470B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950983A (en) * | 2010-10-08 | 2011-01-19 | 天津理工大学 | Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN103337875A (en) * | 2013-06-17 | 2013-10-02 | 合肥工业大学 | Composite control method for grid-connected inverter based on repetitive control and disturbance observer |
| CN103346688A (en) * | 2013-06-24 | 2013-10-09 | 合肥工业大学 | Controlling method of improving current quality of grid-connected inverter during low-load operation |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986458A (en) * | 2014-04-16 | 2014-08-13 | 国家电网公司 | Micro-grid single-phase grid-connection phase-locked loop control method based on repetition control |
| CN103986458B (en) * | 2014-04-16 | 2017-03-08 | 国家电网公司 | A kind of single-phase grid-connected phase locking loop controlling method of the micro-capacitance sensor based on Repetitive controller |
| CN104201922A (en) * | 2014-09-12 | 2014-12-10 | 东南大学 | Clamping-type three-phase voltage-source type inverter and control method thereof |
| CN105610311A (en) * | 2016-01-21 | 2016-05-25 | 北京京仪绿能电力系统工程有限公司 | Method and device for harmonic suppression of photovoltaic inverter |
| CN107204630A (en) * | 2017-06-09 | 2017-09-26 | 湖南大学 | Have the island NPC type power supply high-accuracy control methods of fast dynamic response concurrently |
| CN107204630B (en) * | 2017-06-09 | 2018-04-17 | 湖南大学 | Have the island NPC type power supply high-accuracy control methods of fast dynamic response concurrently |
| CN108512250A (en) * | 2018-04-24 | 2018-09-07 | 安徽工业大学 | A kind of Three-phase high-power photovoltaic combining inverter and the repetitive control for reducing its output current THD |
| CN108512250B (en) * | 2018-04-24 | 2020-05-05 | 安徽工业大学 | Repetitive control method for reducing output current THD of high-power photovoltaic grid-connected inverter |
| CN108631361A (en) * | 2018-05-07 | 2018-10-09 | 上海电力学院 | A kind of LC types three-phase grid-connected inverter control method |
| CN109150048A (en) * | 2018-09-17 | 2019-01-04 | 哈尔滨理工大学 | A kind of permanent magnet synchronous motor multiplex control system of position-sensor-free |
| CN113300613A (en) * | 2021-05-25 | 2021-08-24 | 武汉大学 | Switch type power amplifier based on parallel interleaved multi-level converter and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103647470B (en) | 2016-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103647470B (en) | A kind of three-phase NPC photovoltaic combining inverter based on Repetitive controller | |
| CN111769591B (en) | Double-mode combined control method for multi-inverter system based on double split transformers | |
| CN101345423B (en) | 5-power level H-bridge cascade connection back-to-back current transformer used for wind power generation system | |
| CN102969877B (en) | LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter | |
| CN103580032B (en) | Power network compensation system and control method thereof | |
| CN103560690A (en) | Harmonic wave damping control method for one-phase LCL type grid-connected inverter | |
| CN104467005A (en) | T-type three-level three-phase four-bridge-arm grid-connected photovoltaic power generation system and control method thereof | |
| CN102832840A (en) | Compound control method of photovoltaic grid-connected inverter | |
| CN108599609B (en) | A kind of improvement phase-shifting carrier wave modulator approach based on three module-cascade H bridges | |
| CN103457275B (en) | Based on the modeling method of the reactive power compensation device model of controlled AC current source | |
| CN105356778A (en) | Modularized multi-level inverter and dead-beat control method therefor | |
| CN102916438A (en) | Photovoltaic power generation control system and photovoltaic power generation control method based on three-level inverter | |
| CN103326606A (en) | One-phase five-level inverter | |
| CN105490297A (en) | Microgrid supply voltage and grid current harmonics synchronous compensation method based on dual inverter group coordinated control | |
| CN105006841A (en) | Three-phase grid-connected inverter seamless grid-connected controller and control method thereof | |
| CN103944186A (en) | Control device of three-phase photovoltaic grid-connected inverter | |
| CN107404249B (en) | Low-leakage-current grid-connected inverter circuit and control method thereof | |
| CN103366053B (en) | A kind of improvement of Voltage-oriented control strategy and Mathematical Modeling Methods | |
| CN113078829A (en) | MMC topology with interconnected upper bridge arm sub-modules and high-frequency chain and control method | |
| CN108448630A (en) | The Z-source inverter grid-connected control method controlled based on monocycle and double-current ring | |
| CN104300820A (en) | Digital control method of two-stage three-phase three-level photovoltaic grid-connected inverter | |
| CN202563019U (en) | Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter | |
| CN202121518U (en) | Flying capacitor type five-level photovoltaic inverter | |
| CN107332271B (en) | Photovoltaic power generation operation control method based on virtual terminal voltage | |
| CN202172367U (en) | Single phase inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20161209 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |