CN205160095U - Isolated form photovoltaic grid -connected inverter of two branch road structures - Google Patents
Isolated form photovoltaic grid -connected inverter of two branch road structures Download PDFInfo
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- CN205160095U CN205160095U CN201520933954.8U CN201520933954U CN205160095U CN 205160095 U CN205160095 U CN 205160095U CN 201520933954 U CN201520933954 U CN 201520933954U CN 205160095 U CN205160095 U CN 205160095U
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- 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
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- 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
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Abstract
The utility model discloses an isolated form photovoltaic grid -connected inverter of two branch road structures, this dc -to -ac converter include main circuit, double -core DSP master control circuit, auxiliary switch power supply circuit, and the main circuit includes consecutive preceding stage boost module, full -bridge topology inverter circuit, output filter module, and preceding stage boost module includes two branch roads, and boost circuit is kept apart including input filter module, high frequency to each branch road, double -core DSP master control circuit includes a DSP controller, the 2nd DSP controller, and a DSP controller is used for driving the high frequency and keeps apart boost circuit to carry out preceding stage double - circuit solar cell panel output maximum power point tracking control, the 2nd DSP controller is used for the full -bridge contravariant control and the electric current contravariant control of being incorporated into the power networks, is connected through the GPIO module between a DSP controller and the 2nd DSP controller. The utility model discloses a two DSP can carry out the timesharing independent control, improve system security response speed. Preceding stage boost module includes two branch roads simultaneously, has efficient advantage.
Description
Technical field
The utility model relates to photovoltaic combining inverter research field, particularly the isolated form photovoltaic combining inverter of a kind of pair of branch structure.
Background technology
The development of change each time of human society, all be unable to do without the use of new forms of energy, the growth in the living standard of the energy to development in science and technology and people plays an important role.In traditional energy, with coal, oil.The fossil energies such as natural gas are main, although the use of traditional energy facilitates industrial development, have also caused a series of deterioration of the ecological environment simultaneously.The resource-constrained of fossil energy, under irrational use, can exhaust eventually.Therefore, for meeting the sustainable development of energy demand, the research of new forms of energy has been caused to the attention of height.
Solar energy have sustainable, safe, reliable, environmental pollution is little and not by the feature such as region restriction, therefore photovoltaic generation is significant to human kind sustainable development.Wherein photovoltaic DC-to-AC converter is the core component of photovoltaic generation application system, has the enterprises such as SMA, KACO, Fronius, Satcom at present and carries out corresponding research.
Grid-connected photovoltaic system is divided into family grid-connected photovoltaic system and power station formula grid-connected photovoltaic system, the two difference is the different of power level, but family grid-connected photovoltaic system can overcome dispersed shortcoming at sunshine, all has more advantage than power station formula grid-connected photovoltaic system in flexibility and economy.But mostly the photovoltaic DC-to-AC converter of research is at present to be applied to power station formula grid-connected photovoltaic system, and be not suitable for large-scale popularization, flexibility is inadequate.Even if there is the photovoltaic DC-to-AC converter designed for family grid-connected photovoltaic system, also exist the shortcomings such as volume is large, efficiency is low more.
Therefore, along with the high speed development of distributed photovoltaic power generation and mobile Internet, need to study a kind of applicable large-scale promotion, high efficiency, the photovoltaic combining inverter with data transport functions, there is important practical value.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, the isolated form photovoltaic combining inverter of a kind of pair of branch structure is provided, this inverter, based on two CSTR core, adopts prime two-way boost module, has the advantage that efficiency is high, cost is low, volume is little.
The purpose of this utility model is realized by following technical scheme: the isolated form photovoltaic combining inverter of a kind of pair of branch structure, comprise main circuit, double-core DSP governor circuit, auxiliary switching power supply circuit, described main circuit comprises the prime boost module be connected successively, full-bridge topology inverter circuit, output filtering module, the output of output filtering module is connected with electrical network, described prime boost module comprises two branch roads, each branch road comprises the input filter module be connected successively, high-frequency isolation boost circuit, the input of described input filter module is connected with solar panel, described double-core DSP governor circuit comprises the first dsp controller, second dsp controller, described first dsp controller is for driving high-frequency isolation boost circuit, and carry out prime two-way solar panel Maximum Power Output point tracing control, described second dsp controller is connected with a grid-connected output detections module, the input of grid-connected output detections module respectively with electrical network, the output of full-bridge topology inverter circuit connects, described second dsp controller is used for full-bridge inverting and controls and grid-connected current inversion control, be connected by GPIO module between first dsp controller and the second dsp controller, described auxiliary switching power supply circuit is used for for inverter provides the ± direct voltage of 15V and 5V.The utility model adopts two CSTR to control, and can carry out timesharing and independently control, and improves the security response speed of system.Prime boost module comprises two branch roads simultaneously, has the advantage that efficiency is high.
Preferably, described inverter also comprises photovoltaic cell current sample module, photovoltaic cell voltage sample module, over-and under-voltage protection module, overtemperature protection module, overcurrent protection module, and described photovoltaic cell current sample module, photovoltaic cell voltage sample module are connected with the first dsp controller by ADC module; Described over-and under-voltage protection module, overtemperature protection module, overcurrent protection module are connected with the first dsp controller by GPIO module; Described grid-connected output detections module comprises grid-connected current sampling feedback module, grid-connected voltage sample detection module, grid-connected frequency sampling detection module, and grid-connected current sampling feedback module, grid-connected voltage sample detection module are connected with the second dsp controller by ADC module; Described grid-connected frequency sampling detection module is connected with the second dsp controller by ECAP module.By above-mentioned module, two dsp controllers can be monitored in real time to the detection of whole inverter, protective circuit.
Preferably, described inverter also comprises WIFI232 wireless communication module, and this module is connected with the first dsp controller by UART module.By adopting WIFI232 wireless communication module, the communication networking of inverter can be carried out, and then carry out centralized monitoring.Adopt UART module, UART serial communication function can be utilized, applicable industry Modbus communication protocol, and use cyclic redundancy check (CRC) code (CyclicRedundancyCheck, CRC) data stream is corrected, improve the stability of communication function, and the credibility of data.
Preferably, described auxiliary switching power supply circuit is ICE3BR2280JZ inverse-excitation type accessory power supply.
Preferably, described first dsp controller is also connected by GPIO module with a display unit, for carrying out the display of monitoring parameter.
Preferably, described input filter module adopts electromagnetic interface filter, and described output filtering module adopts EMC filter.
Preferably, described main circuit adopts modular designs, comprise INPUT-OUTPUT module and POWERCHANGE module two integration modules, described INPUT-OUTPUT module integration has input filter module, output filtering module, island effect protection module, auxiliary switching power supply circuit, wherein input filter module is connected with solar panel by the input of INPUT-OUTPUT module, the output of auxiliary switching power supply circuit by the output of INPUT-OUTPUT module for inverter provides stable each step voltage;
Described POWERCHANGE module comprises high-frequency isolation boost circuit, high-frequency isolation switching tube driver module, switching tube driving protection module, full-bridge topology inverter circuit, full-bridge switch pipe driver module; wherein full-bridge switch pipe driver module adopts two-way transformer to realize powering to the three level of full-bridge switch pipe in full-bridge topology inverter circuit, uses optocoupler to carry out light-coupled isolation driving.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the demand that controls for existing photovoltaic synchronization inverter system of the utility model, devises the master board adopting two panels dsp controller, proposes timesharing independence control model, makes photovoltaic combining inverter prime and rear class control module further.When not increasing cost, several GPIO modules of the general employing of two panels DSP carry out cooperation control, while separate work, can monitoring communications in real time, and improve the security response speed of system.
2, the utility model adopts modular designs, using prime input circuit and the rear class output loop INPUT-OUTPUT module as main circuit, using preceding stage high frequency isolating switch pipe circuit and the rear class full bridge inverter POWERCHANGE module as main circuit.Do not increasing in design difficulty and system cost situation, the utility model have be easy to design realize, function modoularization, external equipment access complexity low, cost is low, is applicable to the advantage applied.
Accompanying drawing explanation
Fig. 1 is the theory diagram of inverter described in the utility model.
Fig. 2 is the circuit diagram of converter main circuit described in the utility model.
Fig. 3 is the present embodiment inverter course of work schematic diagram.
Fig. 4 is two CSTR core control strategy block diagram in the present embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1
As shown in Figure 1, the isolated form photovoltaic combining inverter of the present embodiment a kind of pair of branch structure, comprises main circuit, double-core DSP governor circuit, auxiliary switching power supply circuit, WIFI232 wireless communication module.Main circuit is made up of prime boost module, full bridge inverter, EMC filter, grid-connected output detections module, and wherein prime boost module comprises electromagnetic interface filter, high-frequency isolation boost circuit, high-frequency isolation switching tube driver module, the switching tube driving protection module of two branch roads.Auxiliary switching power supply circuit adopts ICE3BR2280JZ inverse-excitation type accessory power supply, for providing stable ± 15V and 5V direct voltage for each chip of system.Adopt WIFI232 wireless communication module can carry out the communication networking of inverter.Meanwhile, the present embodiment also comprises a LCD1602 liquid crystal display screen, carries out system man-machine interaction display by this device, adds and adopts WIFI232 wireless communication module, can realize computer monitor terminal and carry out centralized monitoring to inverter.
Two CSTR core governor circuit comprises the first dsp controller and the second dsp controller, and two controllers all adopt TMS320F28035 digital signal processor.First dsp controller also by ADC module and photovoltaic cell current sample module, photovoltaic cell voltage sample model calling, is connected with over-and under-voltage protection module, overtemperature protection module, overcurrent protection module by GPIO module.Second dsp controller is connected with grid-connected current sampling feedback module, grid-connected voltage sample detection module by ADC module, is connected with grid-connected frequency sampling detection module by ECAP module.Also by GPIO model calling between two dsp controllers, can monitor in real time the detection of whole inverter, protective circuit.
See Fig. 2, the main circuit of the present embodiment adopts high-frequency isolation type+full-bridge topology inversion, realize PV DC terminal and exchange the isolation of holding, prime adopts the high-frequency isolation boost circuit of two-way 20KHz as DC/DC circuit, rear class have selected the inverter circuit of full-bridge topology, wherein the first dsp controller controls prime dual path type booster circuit, and the operational mode state machine being responsible for system controls, comprise prime boost mode, prime two-way solar panels Maximum Power Output point tracking module, system man-machine display; Second dsp controller controls rear class full bridge inverter, is responsible for the control of system inversion grid connection and controls, comprise digital servo-control ring function, island protect function, sine-converter function.
In the present embodiment, described main circuit adopts modular designs, using prime input circuit and the rear class output loop INPUT-OUTPUT module as main circuit, using preceding stage high frequency isolating switch pipe circuit and the rear class full bridge inverter POWERCHANGE module as main circuit.Described INPUT-OUTPUT module comprises electromagnetic interface filter, EMC filter, island effect protection module; and auxiliary switching power supply circuit; the input of INPUT-OUTPUT module is connected with solar panel, and output provides stable ± 15V and 5V direct voltage to various control chip and driving chip.Described POWERCHANGE module comprises high-frequency isolation boost circuit, prime switching tube driver module (high-frequency isolation switching tube driver module, switching tube drive protection module), full-bridge topology inverter circuit, full-bridge switch pipe driver module; wherein full-bridge switch pipe driver module adopts two-way transformer to realize powering to the three level of full-bridge switch pipe in full-bridge topology inverter circuit, uses optocoupler to carry out light-coupled isolation driving.
Below by the working state of system of the high-frequency isolation type photovoltaic combining inverter of two branch structure, and double-core DSP timesharing works alone flow process two parts illustrative system operation principle.
Photovoltaic combining inverter course of work schematic diagram as shown in Figure 3.Inverter has five mode states, is respectively standby mode, checking mode, normal mode of operation, error pattern, reconnects pattern.When inverter initial start-up, system is in standby mode, first dsp controller starts to detect each parameter, if after busbar voltage is greater than 150V, then the first dsp controller enters checking mode, detect fault-free and just can carry out maximal power tracing and phase-locked grid-connected function, enter normal mode of operation, when a failure occurs, system enters error pattern at once, close driver output, disconnect with electrical network.Under error pattern, if system detected normally in one minute, enter the pattern of reconnecting, after reconnecting 60 seconds, fault-free again enters normal mode of operation and normally works.
Two CSTR core control flow chart as shown in Figure 4, on the basis of workflow described in Fig. 3, the flow process that the timesharing of two CSTR core works alone is as follows: when system is in standby mode, and the first dsp controller, the second dsp controller are all in standby mode, then enter checking mode.Judge that whether current state is normal; if normal; then the first dsp controller first calls soft start boosting; call PI algorithm again and carry out voltage stabilizing 400V; second dsp controller then waits for the switching of prime DSP mode of operation; after prime has been boosted; first dsp controller closes rear class relay by synchronous GPIO input/output terminal notice rear class second dsp controller; now system enters normal mode of operation; prime first dsp controller enters maximal power tracing mode of operation, and rear class second dsp controller enters the grid-connected and island protect pattern of dead beat.Two panels DSP, by the interface of GPIO module, carries out the notice of pattern switching.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (7)
1. the isolated form photovoltaic combining inverter of a two branch structure, it is characterized in that, comprise main circuit, double-core DSP governor circuit, auxiliary switching power supply circuit, described main circuit comprises the prime boost module, full-bridge topology inverter circuit, the output filtering module that are connected successively, the output of output filtering module is connected with electrical network, described prime boost module comprises two branch roads, each branch road comprises the input filter module, the high-frequency isolation boost circuit that are connected successively, and the input of described input filter module is connected with solar panel, described double-core DSP governor circuit comprises the first dsp controller, second dsp controller, described first dsp controller is for driving high-frequency isolation boost circuit, and carry out prime two-way solar panel Maximum Power Output point tracing control, described second dsp controller is connected with a grid-connected output detections module, the input of grid-connected output detections module respectively with electrical network, the output of full-bridge topology inverter circuit connects, described second dsp controller is used for full-bridge inverting and controls and grid-connected current inversion control, be connected by GPIO module between first dsp controller and the second dsp controller, described auxiliary switching power supply circuit is used for for inverter provides the ± direct voltage of 15V and 5V.
2. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, it is characterized in that, described inverter also comprises photovoltaic cell current sample module, photovoltaic cell voltage sample module, over-and under-voltage protection module, overtemperature protection module, overcurrent protection module, and described photovoltaic cell current sample module, photovoltaic cell voltage sample module are connected with the first dsp controller by ADC module; Described over-and under-voltage protection module, overtemperature protection module, overcurrent protection module are connected with the first dsp controller by GPIO module; Described grid-connected output detections module comprises grid-connected current sampling feedback module, grid-connected voltage sample detection module, grid-connected frequency sampling detection module, and grid-connected current sampling feedback module, grid-connected voltage sample detection module are connected with the second dsp controller by ADC module; Described grid-connected frequency sampling detection module is connected with the second dsp controller by ECAP module.
3. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, is characterized in that, described inverter also comprises WIFI232 wireless communication module, and this module is connected with the first dsp controller by UART module.
4. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, is characterized in that, described auxiliary switching power supply circuit is ICE3BR2280JZ inverse-excitation type accessory power supply.
5. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, is characterized in that, described first dsp controller is also connected by GPIO module with a display unit, for carrying out the display of monitoring parameter.
6. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, is characterized in that, described input filter module adopts electromagnetic interface filter, and described output filtering module adopts EMC filter.
7. the isolated form photovoltaic combining inverter of according to claim 1 pair of branch structure, it is characterized in that, described main circuit adopts modular designs, comprise INPUT-OUTPUT module and POWERCHANGE module two integration modules, described INPUT-OUTPUT module integration has input filter module, output filtering module, island effect protection module, auxiliary switching power supply circuit, wherein input filter module is connected with solar panel by the input of INPUT-OUTPUT module, the output of auxiliary switching power supply circuit by the output of INPUT-OUTPUT module for inverter provides stable each step voltage,
Described POWERCHANGE module comprises high-frequency isolation boost circuit, high-frequency isolation switching tube driver module, switching tube driving protection module, full-bridge topology inverter circuit, full-bridge switch pipe driver module; wherein full-bridge switch pipe driver module adopts two-way transformer to realize powering to the three level of full-bridge switch pipe in full-bridge topology inverter circuit, uses optocoupler to carry out light-coupled isolation driving.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305496A (en) * | 2015-11-19 | 2016-02-03 | 保力新能源科技(东莞)有限公司 | Isolated-type photovoltaic grid-connected inverter with dual-branch structure and working method of same |
| CN107040148A (en) * | 2017-05-02 | 2017-08-11 | 北京群菱能源科技有限公司 | A kind of photovoltaic DC-to-AC converter |
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- 2015-11-19 CN CN201520933954.8U patent/CN205160095U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305496A (en) * | 2015-11-19 | 2016-02-03 | 保力新能源科技(东莞)有限公司 | Isolated-type photovoltaic grid-connected inverter with dual-branch structure and working method of same |
| CN105305496B (en) * | 2015-11-19 | 2017-08-08 | 保力新能源科技(东莞)有限公司 | The isolated form photovoltaic combining inverter and its method of work of a kind of pair of branch structure |
| CN107040148A (en) * | 2017-05-02 | 2017-08-11 | 北京群菱能源科技有限公司 | A kind of photovoltaic DC-to-AC converter |
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