CN104218610A - Novel photovoltaic grid-connected inverter capable of achieving self-adaptive adjustment of electric energy qualities - Google Patents
Novel photovoltaic grid-connected inverter capable of achieving self-adaptive adjustment of electric energy qualities Download PDFInfo
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- CN104218610A CN104218610A CN201410500605.7A CN201410500605A CN104218610A CN 104218610 A CN104218610 A CN 104218610A CN 201410500605 A CN201410500605 A CN 201410500605A CN 104218610 A CN104218610 A CN 104218610A
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
Abstract
Disclosed is a novel photovoltaic grid-connected inverter capable of achieving self-adaptive adjustment of electric energy qualities. The function of photovoltaic inverter grid connection, high converting efficiency, automatic maximum power point tracking (MPPT) and countercurrent prevention can be achieved, power grid parameters can be dynamically detected, harmonic suppression and reactive power compensation can be performed, and self-adaptive adjustment of the electric energy qualities can be achieved. The photovoltaic grid-connected inverter comprises a radiator, a temperature detecting portion, a main control panel, an insulated gate bipolar translator (IGBT) driving portion, an AD sampling circuit, an inverter bridge and a grid-connected main circuit. When a power grid is free of fluctuation, a three-phase current signal is detected and decoupled to perform active power filtering (APF), power grid harmonic components are filtered out, particular harmonic orders can be specifically eliminated, and thereby, the power grid voltage distortion rate can be well changed. When power grid fault or disturbance causes an inverter grid-connected point to generate low voltage ride through, the inverter works in a static var compensation (SVG) mode in order to avoid grid voltage drop, reactive power of a power grid system can be automatically rapidly compensated, and grid-connected operation of a photovoltaic generator set can be continuously guaranteed within the range of voltage drop of the power grid.
Description
Technical field
The present invention relates to quality of power supply field, be specifically related to grid-connected inverters link the self adaptation of the quality of power supply is regulated, be embodied in especially inverter and can be used as active filter and reactive power compensation device, eliminate mains by harmonics, prevent low voltage crossing.
Background technology
Along with the reinforcement of environmental consciousness and for the demand of regenerative resource, photovoltaic power generation technology comes into one's own day by day.Because solar energy has unsteadiness and randomness, must take electric energy can be sent into electrical network after effective power converter measure.Through years of researches and practice; grid-connected link technology is relatively mature and stable; there is strict specification requirement various countries for grid-connected equipment, protection when protection while comprising grid-connected current harmonic wave, injection electrical network DC component, electrical network overvoltage/undervoltage, electrical network are crossed under-frequency, island protect etc.Along with the access of a large amount of distributed power generation equipment, the operation of electrical network, scheduling have been proposed to new challenge, electrical network has proposed as new demands such as low voltage crossing, reactive power compensation, energy storage.
Traditional photovoltaic combining inverter generally has the features such as high, the automatic MPPT of conversion efficiency, anti-backflow device, isolated island detection.Along with the universal and popularization of China to distributed power generation and intelligent grid concept, photovoltaic combining inverter is being brought into schedule aspect quality of power supply adjusting function.Comprise inhibition and the elimination of mains by harmonics component, whether the compensation of reactive power, possess ability of low voltage crossing etc.
Summary of the invention
The invention provides the photovoltaic combining inverter that a kind of new electric energy quality adaptation regulates, its objective is the function that can not only realize photovoltaic inverter grid-connected, high conversion efficiency, automatic MPPT, counterflow-preventing, can also to electrical network parameter, detect dynamically, carry out harmonic wave inhibition and reactive power compensation, the quality of power supply is carried out to self adaptation adjusting.
technical scheme
The present invention implements according to following technical scheme: utilize Hall element to gather electrical network three-phase voltage and current signal, decoupling zero conversion through the laggard row current signal of phase-locked link, obtain first-harmonic and harmonic component and meritorious and the idle component of electric current, according to given reference current computing, carry out PI again and regulate generation instruction current signal, through Hysteresis Current link, produce PWM and drive signal to send into photovoltaic combining inverter, finally by crossing idle inductance and filter capacitor as required or set point compensation network reactive power, suppressing mains by harmonics.
advantage and effect
By enforcement of the present invention, photovoltaic combining inverter can be followed the tracks of current operation of power networks state fast and accurately, effectively suppresses filtering mains by harmonics component, can also eliminate targetedly particular harmonic number of times, improves line voltage aberration rate.When electric network fault or disturbance cause that grid-connected inverters point produces low voltage crossing, inverter can fast repairing fills the reactive power of network system, improve low voltage ride-through capability, guarantee that in scope that electrical network falls at voltage, photovoltaic generation unit can continually be incorporated into the power networks.A novel like this combining inverter, can the adaptive adjusting electrical network quality of power supply.
accompanying drawing explanation
Fig. 1 is Novel photovoltaic grid-connected inverter systematic schematic diagram;
Fig. 2 is APF active power filtering program flow diagram;
Fig. 3 is SVG reactive power compensation program flow diagram.
In figure, 1-power network signal Acquisition Circuit; 2-voltage-phase latch cicuit; 3-Current Decoupling tracking circuit; 4-instruction current computing circuit; 5-drive signal generation circuit; 6-three phase inverter bridge; 7-idle inductance; 8-filter capacitor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The photovoltaic synchronization inverter system structure that this new electric energy quality adaptation regulates as shown in Figure 1.Comprise power network signal Acquisition Circuit 1, voltage-phase latch cicuit 2, Current Decoupling tracking circuit 3, instruction current computing circuit 4, drive signal generation circuit 5, three phase inverter bridge 6, idle inductance 7, filter capacitor 8.Power network signal Acquisition Circuit 1 is used for gathering electrical network three-phase current voltage, access master control borad.
Master control borad carries out four processing.First, the power network signal of collection is carried out to phase place and latch, for the electric power system of three-phase equilibrium, only to wherein one latching mutually and obtain phase angle, the anglec of rotation of synchronous rotation transformation while following the tracks of as Current Decoupling; Current signal decoupling zero is obtained to fundametal compoment and harmonic component and real component and idle component; According to given reference current computing, carry out PI again and regulate generation instruction current signal; Finally by the raw circuit of the signal movable property of overdriving, PWM ripple letter is sent into photovoltaic combining inverter.
The program flow diagram of active power filtering part as shown in Figure 2.First carry out DSP initialization and data initialization, by interrupt routine, judge whether to enter APF program, call in after start-up routine and wait for that sampling starts, and reads AD switching signal, the control algolithm of carrying out master control borad, finally outputs to PWM module by driving signal and sends into inverter.
The program flow diagram of reactive power compensation part as shown in Figure 3, first carry out the initialization of dsp system variable, gather electrical network three-phase signal, through digital phase-locked loop joint, detect harmonic current, through DC voltage PI, control and calculate target current, by interrupt routine, judge whether to enter SVG program, call in after start-up routine and wait for that sampling starts, and reads AD switching signal, the control algolithm of carrying out master control borad, finally outputs to PWM module by driving signal and sends into inverter.
Claims (4)
1. the photovoltaic combining inverter that a new electric energy quality adaptation regulates, it is characterized in that, except conventional photovoltaic combining inverter, also comprise active power filtering (APF) and reactive power compensation (SVG) part, wherein, algorithm is partly unified by controller complete independently, automatically regulates the driving signal of inverter according to the signal of real-time detection, by capacitor or inductor, to electrical network harmonic component or reactive current component, play the automatic function of improving the electrical network quality of power supply.
2. the photovoltaic combining inverter that a new electric energy quality adaptation regulates, it is characterized in that, whole inverter comprises a plurality of working cells, and hardware components has rectifier, relay and radiator portion, power supply and temperature detection part, IGBT drive part, AD sample circuit, inverter bridge, filter, master control borad.
3. the photovoltaic combining inverter regulating according to a kind of new electric energy quality adaptation described in claim 1 and 2, is characterized in that, the DC side of inverter is by the three-phase alternating current point process rectifier gained of grid side, without the DC voltage of additional configuration inverter; Relay is by ULQ2003 high-voltage great-current darlington transistor array chip controls coil;
Control board power supply by provide ± 5V of MAX8215 power supply microcontroller and ± 12V voltage, temperature detection part relatively produces temperature feedback signal by the two voltage comparators of LM393 and reference signal;
IGBT drive part drives signal by A3120 photoelectrical coupler for inverter bridge Liu road IGBT gate pole provides the PWM of 2 amperes of output currents, and 6 output switch power sources that wherein power supply of A3120 consists of UC3845 provide;
AD sample circuit is divided into 5 parts, it is respectively the RS-485 transceiver of being isolated by ADM2582 integrated power supply, the threephase load current sampling circuit being formed by TL074 two-stage cascade JFET input operational amplifier, direct voltage sample circuit, line voltage sample circuit and the DSP control board internal current sample circuit with parameter ratio, adjusted that by TL074 cascade and two voltage comparator LM393, are formed;
The filter of having chance with adopts LCL structure access grid side, and radiator portion adopts air-cooled form;
Main control chip adopts digital signal processing chip TMS320C6747, and outside spread F LASH memory K9F4G08U0A, adopts 32 floating-point operations to complete APF and SVG algorithm, AD sample, interruption processing and the subprogram of all kinds of feedback signals.
4. the photovoltaic combining inverter regulating according to a kind of new electric energy quality adaptation described in claim 1,2 and 3, it is characterized in that the output of control inverter intelligently of running status that inverter can dynamically monitor current power system is to improve the quality of power supply, when current grid side harmonic content is larger, inverter makes main circuit capacitor and inductor produce resonance bypass harmonic component according to detecting to control to export, can also set in advance the number of times of harmonic wave, carry out specific subharmonic elimination; When having large-scale reactive load, load-side changes the power factor of electric power system, or while causing power network fluctuation, in order to make the combining inverter automatic off-grid of avoiding tripping, need to give power network compensation reactive power, avoid causing more serious power network fluctuation even to paralyse because voltage falls, make photovoltaic combining inverter possess the ability of certain low voltage crossing simultaneously;
In detection method, APF and SVG have similarity, current detecting all adopts first-harmonic and the Harmonic detection based on instantaneous reactive power theory, through coordinate transform processing, active current ip and reactive current component iq can be obtained respectively, through a series of inverse transformations, corresponding current command signal Ica, Icb, Icc can be obtained;
The summation for reactive current and harmonic component obtaining when only ip being carried out to inverse transformation is harmonic signal if ip and iq are changed to what obtain simultaneously, if only need reactive current signal only need carry out inverse transformation and needn't electric current be done and be differed from iq;
On control strategy, by stagnant ring comparison method, obtain rectangular pulse as the control signal of each switch element of current transformer, for stagnant ring comparison strategy, within the single cycle because ring width relatively can cause switching frequency non-constant, thereby increase the harmonic components of system, in this cover photovoltaic combining inverter, in order to overcome this problem, adopt the stagnant ring comparison method of fixed frequency, after stagnant ring process, add zero-order holder link, constant with this maintained switch frequency.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785174A (en) * | 2016-03-11 | 2016-07-20 | 深圳茂硕电气有限公司 | Intelligent fault detection and data storage system for photovoltaic inverter |
| TWI560968B (en) * | 2015-10-13 | 2016-12-01 | Ind Tech Res Inst | Polyphase power dispatching system and method |
| CN106340900A (en) * | 2016-09-26 | 2017-01-18 | 国网上海市电力公司 | Distributed energy grid-connected and reactive power compensation compound control system |
| CN106526479A (en) * | 2016-11-07 | 2017-03-22 | 武汉科技大学 | Grid-harmonic-characteristic-based fault diagnosis method for electric system of electric shovel |
| CN106953538A (en) * | 2016-11-29 | 2017-07-14 | 湘潭大学 | It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay |
| CN107179694A (en) * | 2017-07-04 | 2017-09-19 | 福州大学 | A kind of combining inverter Narendra adaptive control algorithms |
| CN107251358A (en) * | 2015-01-06 | 2017-10-13 | 逸节电子有限公司 | The active reactive power of quick response（KVAR）Compensator |
| CN108599166A (en) * | 2018-05-29 | 2018-09-28 | 国网山东省电力公司聊城供电公司 | A kind of dynamic passive compensation harmonic suppression apparatus and control method |
| CN108847683A (en) * | 2018-06-26 | 2018-11-20 | 沈阳工业大学 | Asymmetrical component detection and cancellation element and the method for more level photovoltaic inverters |
| CN110212560A (en) * | 2019-06-27 | 2019-09-06 | 上海电机学院 | Based on the hot energy storage control device of long-range control photovoltaic power generation common network counterflow-preventing and method |
| CN110957755A (en) * | 2019-10-29 | 2020-04-03 | 国网江苏省电力有限公司盐城供电分公司 | Photovoltaic power generation inverter control system and method based on current control |
| CN114094545A (en) * | 2021-11-24 | 2022-02-25 | 江苏莱提电气股份有限公司 | APF/SVG driving circuit fault rapid protection system and method |
| CN114200231A (en) * | 2021-12-03 | 2022-03-18 | 国网青海省电力公司电力科学研究院 | Test method for SVG low voltage ride through characteristic |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251358A (en) * | 2015-01-06 | 2017-10-13 | 逸节电子有限公司 | The active reactive power of quick response（KVAR）Compensator |
| TWI560968B (en) * | 2015-10-13 | 2016-12-01 | Ind Tech Res Inst | Polyphase power dispatching system and method |
| US9935491B2 (en) | 2015-10-13 | 2018-04-03 | Industrial Technology Research Institute | Polyphase power dispatching system and method |
| CN105785174A (en) * | 2016-03-11 | 2016-07-20 | 深圳茂硕电气有限公司 | Intelligent fault detection and data storage system for photovoltaic inverter |
| CN106340900A (en) * | 2016-09-26 | 2017-01-18 | 国网上海市电力公司 | Distributed energy grid-connected and reactive power compensation compound control system |
| CN106526479B (en) * | 2016-11-07 | 2019-03-26 | 武汉科技大学 | Power shovel electrical malfunction diagnostic method based on mains by harmonics feature |
| CN106526479A (en) * | 2016-11-07 | 2017-03-22 | 武汉科技大学 | Grid-harmonic-characteristic-based fault diagnosis method for electric system of electric shovel |
| CN106953538A (en) * | 2016-11-29 | 2017-07-14 | 湘潭大学 | It is a kind of that the method for improving photovoltaic combining inverter conversion efficiency is bypassed based on relay |
| CN107179694A (en) * | 2017-07-04 | 2017-09-19 | 福州大学 | A kind of combining inverter Narendra adaptive control algorithms |
| CN108599166A (en) * | 2018-05-29 | 2018-09-28 | 国网山东省电力公司聊城供电公司 | A kind of dynamic passive compensation harmonic suppression apparatus and control method |
| CN108847683A (en) * | 2018-06-26 | 2018-11-20 | 沈阳工业大学 | Asymmetrical component detection and cancellation element and the method for more level photovoltaic inverters |
| CN108847683B (en) * | 2018-06-26 | 2023-10-27 | 沈阳工业大学 | Asymmetric component detection and elimination device and method for multi-level photovoltaic inverter |
| CN110212560A (en) * | 2019-06-27 | 2019-09-06 | 上海电机学院 | Based on the hot energy storage control device of long-range control photovoltaic power generation common network counterflow-preventing and method |
| CN110212560B (en) * | 2019-06-27 | 2023-05-02 | 上海电机学院 | Remote control photovoltaic power generation-based common-network countercurrent-preventing thermal energy storage control device and method |
| CN110957755A (en) * | 2019-10-29 | 2020-04-03 | 国网江苏省电力有限公司盐城供电分公司 | Photovoltaic power generation inverter control system and method based on current control |
| CN114094545A (en) * | 2021-11-24 | 2022-02-25 | 江苏莱提电气股份有限公司 | APF/SVG driving circuit fault rapid protection system and method |
| CN114094545B (en) * | 2021-11-24 | 2024-04-09 | 江苏莱提电气股份有限公司 | APF/SVG driving loop fault rapid protection system and method |
| CN114200231A (en) * | 2021-12-03 | 2022-03-18 | 国网青海省电力公司电力科学研究院 | Test method for SVG low voltage ride through characteristic |
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