CN203387198U - SOPC based photovoltaic grid-connected device - Google Patents
SOPC based photovoltaic grid-connected device Download PDFInfo
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- CN203387198U CN203387198U CN201320463380.3U CN201320463380U CN203387198U CN 203387198 U CN203387198 U CN 203387198U CN 201320463380 U CN201320463380 U CN 201320463380U CN 203387198 U CN203387198 U CN 203387198U
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- photovoltaic grid
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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
- 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
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Abstract
The utility model discloses an SOPC based photovoltaic grid-connected device, which is mainly formed by connecting a main circuit, a Hall sensor, a signal conditioning circuit, an analog-to-digital converter, a detection circuit, an FPGA control module and a driving circuit in sequence. The SOPC based photovoltaic grid-connected device disclosed by the utility model effectively solves problems of slow system response speed, low tracking precision, poor dynamic characteristic, incapability or difficulty in realizing on-line system programming, poor operational stability and anti-interference ability, low work efficiency, large size and heavy weight of an existing photovoltaic grid-connected device through carrying out structural improvement on the existing photovoltaic grid-connected device.
Description
Technical field
The utility model belongs to the solar photovoltaic technology field, relates to a kind of photovoltaic grid-connected device based on SOPC.
Background technology
Solar energy is clean, environmental protection, inexhaustible, nexhaustible, is the important directions of future source of energy development.For better, more convenient, the more effective solar energy that utilizes, the electric energy that solar energy need to be sent is incorporated to shared electrical network, has produced photovoltaic grid-connected device.Up to now, in order to realize the grid-connected of photovoltaic generation electric energy, the solution of often selecting is to adopt special-purpose ASIC, single-chip microcomputer and digital signal processor DSP etc.
There is following defect mostly in prior art: system response time is slow, tracking accuracy is low, poor dynamic, can not or be difficult for realizing in-system programming, system works stability and poor anti jamming capability, and system works efficiency is low, the large heaviness of body.
The utility model content
In order to solve, existing photovoltaic grid-connected device system response time is slow, tracking accuracy is low, poor dynamic, can not or be difficult for realizing in-system programming, system works stability and poor anti jamming capability, system works efficiency is low, the problem of the large heaviness of body, and the utility model provides a kind of photovoltaic grid-connected device based on SOPC.Its technical scheme is as follows:
A kind of photovoltaic grid-connected device based on SOPC, mainly be connected in sequence by main circuit, Hall element, signal conditioning circuit, analog to digital converter, testing circuit, FPGA control module, drive circuit.
Compared with prior art, the beneficial effects of the utility model: the utility model is by carrying out structural improvement to existing photovoltaic grid-connected device, efficiently solve that existing photovoltaic grid-connected device system response time is slow, tracking accuracy is low, poor dynamic, can not or be difficult for realizing in-system programming, system works stability and poor anti jamming capability, system works efficiency is low, the problem of the large heaviness of body.
The accompanying drawing explanation
The structural representation that Fig. 1 is the photovoltaic grid-connected device of the utility model based on SOPC.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with drawings and Examples.
With reference to Fig. 1, a kind of photovoltaic grid-connected device based on SOPC mainly is connected in sequence by main circuit 1, Hall element 2, signal conditioning circuit 3, analog to digital converter 4, testing circuit 5, FPGA control module 6, drive circuit 7:
The core of described main circuit 1 is a full-bridge inverter, and mainly completing the wide region DC inverter of photovoltaic array output is sinusoidal ac, and realization connects with electrical network, grid-connected;
Described Hall element 2 is for the alternating current of the direct voltage that gathers photovoltaic array output and DC side reference instruction voltage, inverter output, line voltage etc. and send into signal conditioning circuit and processed;
Described signal conditioning circuit 3 mainly completes the conditioning to sampled signal, i.e. the processing of amplification, filtering etc.;
Described analog to digital converter 4 realizes gathering and the analog signal conversion through nursing one's health is that digital signal is sent into the FPGA control module;
Described testing circuit 5 is for catching the zero crossing of mains voltage signal, and guarantees that through phase-locked loop circuit the inverter output current synchronizes with its tracking electric network voltage phase;
Described FPGA control module 6 is control centres of whole device, completes following control work:
Complete the control of outside A/D converter sequential and the storage of translation data, guarantee that A/D converter is changed external analog signal according to certain work schedule;
Complete all-digital phase-locked loop control work, guarantee that electric current and line voltage that photovoltaic parallel in system is exported remain the same frequency same-phase;
Produce and be used for the current waveform that builds the waveform of grid-connected current or protect required Active frequency drift detection method for building island effect;
Complete the pwm signal generator work with Dead Time, guarantee the work of carrying out that outside full-bridge circuit can be orderly, and upper and lower bridge arm shoot through phenomenon can not occur;
Complete the realization of control algolithm, guarantee that whole system works in order under set control strategy;
Complete the clock distribution work of each module of whole system, control the SOPC system based on NiosII embedded software core processor, guarantee that each sub-module of system all works in an orderly manner under the control of clock;
Described drive circuit 7, for receiving the output of FPGA pwm signal generating unit, is controlled the turn-on and turn-off of power MOSFET in the main circuit inverter.
Further preferably, described photovoltaic grid-connected device adopts full bridge inverter as system capacity conversion and control core, and adopt a kind of PI of the Direct Current with electrical network voltage feedforward control control strategy, eliminated the impact of grid disturbances on the grid-connected current quality, improved the tracking accuracy of system, can synchronously follow the tracks of line voltage for assurance inverter output current, design the all-digital phase-locked loop control circuit of realizing based on FPGA, improve the antijamming capability of system.
Further preferably, the FPGA control module of described photovoltaic grid-connected device adopts the VHDL language programming, completes following work in fpga chip:
Complete the control of outside A/D converter sequential and the storage of translation data, guarantee that A/D converter is changed external analog signal according to certain work schedule;
Complete all-digital phase-locked loop control work, guarantee that electric current and line voltage that photovoltaic parallel in system is exported remain the same frequency same-phase;
Complete waveform generator work, produce and be used for the current waveform that builds grid-connected current waveform or protect required Active frequency drift detection method for building island effect;
Complete the pwm signal generator work with Dead Time, guarantee the work of carrying out that outside full-bridge circuit can be orderly, and upper and lower bridge arm shoot through phenomenon can not occur;
Complete the realization of control algolithm, guarantee that whole system works in order under set control strategy;
Complete the clock distribution work of each module of whole system, control the SOPC system based on NiosII embedded software core processor, guarantee that each sub-module of system all works in an orderly manner under the control of clock.
Further preferably, described photovoltaic grid-connected device has been realized ADPLL, AD control store, modified model AFD, pwm circuit module in FPGA, builds the photovoltaic parallel in system IP stone based on SOPC; Build the Nios II Embedded Soft Core processor system of completion system, and design and debugged main program and interrupt routine and corresponding control and driver and carry out each module of coordinated control system in the NiosII development environment, by the system hardware and software collaborative work, the realization of high efficient and reliable the expection the control target.
In main circuit, the wide region direct current of photovoltaic array output, after DC bus capacitor filtering and voltage stabilizing, is sent into the input of full-bridge inverter, by inverter bridge, is exported after it is transformed to alternating current, be connected with electrical network through filter inductance L again, also with each, form the intermodule physical connection simultaneously.
In control circuit, on the one hand, system adopts Hall element respectively to inverter output current i
l, electrical network both end voltage U
g, DC bus capacitor both end voltage U
dcand DC side reference instruction voltage U
dc *this four roads signal is sampled, after sampling, the signal of gained is amplified, is sent into after filtering the input end of analog signal of modulus converter A/D through signal conditioning circuit, modulus converter A/D is changed under the work schedule of FPGA is controlled, digital signal after changing is the most at last sent into FPGA and is stored and process, and FPGA exports the four road pwm signals that the two-way pwm signal is sent into drive circuit generation driving full-bridge inverting after a series of processing, complete the control to main circuit.On the other hand, the line voltage U after signal conditioning circuit is processed
gcatch voltage zero-crossing point of power grid through zero cross detection circuit, and can obtain the line voltage phase angle theta after sending into the ADPLL resume module in FPGA, search sinusoidal wave table by the gained phase angle theta, after the output multiplication of acquired results and direct current pressure ring PI controller jointly as the instruction current of interior circular current ring, thereby guaranteed that the inverter output current can synchronously follow the tracks of the variation of line voltage all the time.Local load when wherein, net side Parallel RLC Circuit is mainly used in the analogue system islet operation.
The above; it is only the utility model preferred forms; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses, the simple change of the technical scheme that can obtain apparently or equivalence are replaced and are all fallen in protection range of the present utility model.
Claims (1)
1. the photovoltaic grid-connected device based on SOPC, is characterized in that, mainly by main circuit, Hall element, signal conditioning circuit, analog to digital converter, testing circuit, FPGA control module, drive circuit, is connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320463380.3U CN203387198U (en) | 2013-07-31 | 2013-07-31 | SOPC based photovoltaic grid-connected device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320463380.3U CN203387198U (en) | 2013-07-31 | 2013-07-31 | SOPC based photovoltaic grid-connected device |
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| CN203387198U true CN203387198U (en) | 2014-01-08 |
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| CN201320463380.3U Expired - Fee Related CN203387198U (en) | 2013-07-31 | 2013-07-31 | SOPC based photovoltaic grid-connected device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414210A (en) * | 2013-07-31 | 2013-11-27 | 广西大学 | Photovoltaic grid-connected device based on SOPC |
| CN106130387A (en) * | 2016-06-27 | 2016-11-16 | 国网江苏省电力公司常州供电公司 | Grid-connected inverters control method containing LCL filter |
| CN111900885A (en) * | 2020-07-15 | 2020-11-06 | 国网北京市电力公司 | Control method and device for power supply of transformer area identification testing device |
-
2013
- 2013-07-31 CN CN201320463380.3U patent/CN203387198U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414210A (en) * | 2013-07-31 | 2013-11-27 | 广西大学 | Photovoltaic grid-connected device based on SOPC |
| CN103414210B (en) * | 2013-07-31 | 2016-12-28 | 广西大学 | A kind of photovoltaic grid-connected device based on SOPC |
| CN106130387A (en) * | 2016-06-27 | 2016-11-16 | 国网江苏省电力公司常州供电公司 | Grid-connected inverters control method containing LCL filter |
| CN106130387B (en) * | 2016-06-27 | 2018-10-30 | 国网江苏省电力公司常州供电公司 | Grid-connected inverters control method containing LCL filter |
| CN109378988A (en) * | 2016-06-27 | 2019-02-22 | 国网江苏省电力公司常州供电公司 | A kind of grid-connected inverters control method containing LCL filter |
| CN109378988B (en) * | 2016-06-27 | 2020-05-19 | 国网江苏省电力公司常州供电公司 | Inverter grid-connected control method containing LCL filter |
| CN111900885A (en) * | 2020-07-15 | 2020-11-06 | 国网北京市电力公司 | Control method and device for power supply of transformer area identification testing device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20140731 |
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| EXPY | Termination of patent right or utility model |