CN201946990U - Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter - Google Patents
Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter Download PDFInfo
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- CN201946990U CN201946990U CN201020679395XU CN201020679395U CN201946990U CN 201946990 U CN201946990 U CN 201946990U CN 201020679395X U CN201020679395X U CN 201020679395XU CN 201020679395 U CN201020679395 U CN 201020679395U CN 201946990 U CN201946990 U CN 201946990U
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- inverter
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- inductor
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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
Abstract
The utility model discloses a schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter. The schedulable three-phase photovoltaic grid-connected inverter consists of an inverter, an isolating transformer, three filter reactors and three filter capacitors, wherein the three filter reactors and the three filter capacitors are connected into a three-phase LC (inductor-capacitor) filter; a direct current input end of the inverter is connected with an output end of a photovoltaic battery; and an alternate current output end of the inverter is connected with a power grid by the three-phase LC filter formed by connecting the three filter reactors and the three filter capacitors and the isolating transformer in sequence. In the utility model, high quality grid-connected current can be obtained under the lower switch frequency; the three-phase LCL filter if formed by a transformer leakage inductor, the three filter reactors and the filter capacitors, therefore, three reactors are saved, and the manufacturing cost is low; and the active power sent to the power grid can be changed by changing the phase-angle difference between the output voltage of the inverter and the voltage of the power grid, thereby realizing the scheduling function of the power grid to a photovoltaic system.
Description
Technical field
The utility model relates to a kind of device of the electric energy feed-in electrical network with photovoltaic generation equipment output, belongs to technical field of power generation.
Background technology
Along with the continuous enhancing of the day by day exhausted and human environmental consciousness of global fossil energy, be that the solar power generation cause of core has had development at full speed in recent years with the photovoltaic.Photovoltaic generation equipment mainly contains independently-powered and the two kinds of working methods of generating electricity by way of merging two or more grid systems.The conventional photovoltaic generating equipment adopts independently-powered mode mostly, and in the majority with family usefulness and middle mini system, is vulnerable to the influence in time and season.Along with the progress of power electronic technology and the development of control theory, generating electricity by way of merging two or more grid systems becomes the development trend of photovoltaic generation.
Combining inverter is the core component of photovoltaic parallel in system, and its performance directly affects the stability of the power supply quality of power supply and grid-connected system, and therefore, parallel network reverse technology and key equipment become the emphasis and the focus of research.At present, the major defect that the three-phase photovoltaic grid-connected inverting device exists is that output current wave is poor, the equipment cost height, and photovoltaic generating system power output instability, causes very difficulty of electric network coordination scheduling.
The utility model content
The utility model be used to overcome prior art defective, provide a kind of three-phase photovoltaic grid-connected inverting dispatched device, to reduce equipment cost, improve the grid-connected current quality and to realize the scheduling feature of electrical network to photovoltaic system based on LCL filtering.
The alleged problem of the utility model realizes with following technical proposals:
A kind of three-phase photovoltaic grid-connected inverting dispatched device based on LCL filtering, form by inverter, isolating transformer, three filter reactors and three filter capacitors, described three filter reactors and three filter capacitors are connected into three-phase LC filter, the direct-flow input end of described inverter connects the output of photovoltaic cell, and ac output end is connected with electrical network with isolating transformer via the three-phase LC filter that three filter reactors and three filter capacitors are connected into successively.
The above-mentioned three-phase photovoltaic grid-connected inverting dispatched device based on LCL filtering, the leakage inductance of described three-phase LC filter and isolating transformer constitute three-phase LCL filter.
The above-mentioned three-phase photovoltaic grid-connected inverting dispatched device based on LCL filtering, the phase angle difference control end of described inverter DC/AC output voltage and line voltage is connected the signal output part of inverter trigger circuit.
The above-mentioned three-phase photovoltaic grid-connected inverting dispatched device based on LCL filtering all is serially connected with anti-resonant resistance on the branch road of described three filter capacitors; The direct-flow input end of described inverter also is connected to DC voltage-stabilizing electric capacity.
The utility model utilizes three filter reactors and three filter capacitors of isolating transformer leakage inductance and front to constitute three-phase LCL filter, has saved three reactors, has reduced the manufacturing cost of inverter.This LCL filter can make inverter than obtaining high-quality grid-connected current under the low switching frequency, and then can reduce switching frequency, reduces the inverter switching device loss.In addition, when photovoltaic generation equipment utilization the utility model is incorporated into the power networks, can change the active power of sending into electrical network, realize the scheduling feature of electrical network photovoltaic system by the phase angle difference that changes inverter output voltage and line voltage.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present utility model;
Fig. 2 is the equivalent schematic diagram of LCL filter;
Fig. 3 is the photovoltaic parallel in system equivalent schematic diagram;
Fig. 4 is a control flow chart of the present utility model.
Each symbol is among the figure: GV, photovoltaic cell; D, diode; DC/AC, inverter; B, batteries; N, electrical network; T, isolating transformer; CF, inverter trigger circuit; L1, L2, L3, filter reactor; C0, DC voltage-stabilizing electric capacity; C1, C2, C3, filter capacitor; R, anti-resonant resistance;
, filter inductance;
, filter capacitor;
, isolating transformer the primary side leakage inductance;
, anti-resonant resistance;
,
Winding resistance;
, through the fundametal compoment of LCL filtered inverter output voltage;
, line voltage;
, inverter output voltage and line voltage phase angle difference;
, isolating transformer the secondary side reactance; P, send into the active power of electrical network.
Embodiment
The utility model proposes a kind of three-phase photovoltaic grid-connected inverting dispatched device, utilize this device can realize flowing into the coordination control of electric network active power, high-quality grid-connected current is provided based on LCL filtering.The utility model utilizes the leakage inductance of isolating transformer T to combine with prime LC filter to realize the function of LCL filter, has saved three filter reactors, and isolating transformer and core of reactor can adopt the low frequency made, so cost is not high.This novel three-phase photovoltaic grid-connected inverting device adopts isolating transformer T to insulate and transformation, has the function of good anti-thunderbolt and elimination sharp wave, and the stability of system is strong.
Referring to Fig. 1, the utility model mainly comprises DC voltage-stabilizing capacitor C 0, inverter DC/AC, filter reactor L1, L2, L3, filter capacitor C1, C2, C3, isolating transformer T, AC network N and controller, and the leakage inductance of filter reactor L1, L2, L3, filter capacitor C1, C2, C3 and isolating transformer T has been formed the LCL filter jointly.Like this, the direct current energy that photovoltaic cell GV produces is an alternating current by inverter DC/AC inversion, is fed to electrical network by isolating transformer T after LCL filtering.The LCL filter has guaranteed that inverter can obtain high-quality grid-connected current and good dynamic and static state performance than low switching frequency the time.In addition, the utility model is regulated the phase angle difference of control inverter DC/AC output voltage and line voltage by inverter trigger circuit CF, realized the dispatched characteristic of active power, can the power delivery that photovoltaic array produces be arrived electrical network according to the needs of electrical network, unnecessary electric energy can adopt energy storage device to store.
Shown in Figure 2 is the equivalent schematic diagram of one group of LCL filter, and it is by filter inductance
(L1 in the corresponding diagram 1, L2, L3), filter capacitor
The primary side leakage inductance of (C1 in the corresponding diagram 1, C2, C3), isolating transformer
Combine, wherein filter inductance
With transformer leakage inductance all with corresponding windings resistance (
,
).In order to suppress resonance, the resistive element of on the filter capacitor branch road, connecting among the design
(three resistance R in the corresponding diagram 1).This leakage inductance and the common LCL filter of forming of prime LC that utilizes isolating transformer saved three reactors, when reducing cost and reducing the inverter volume, realized high-quality grid-connected current, demonstrated fully the advantage of LCL filter.
Switching frequency adopts 9600Hz in the utility model, under this high switching frequency, adds the filtering of LCL filter, and the inverter output voltage waveform is very near sinusoidal wave.Therefore can equivalence be that unit is to Infinite bus system, as shown in Figure 3 with three-phase photovoltaic grid-connected system.Among the figure
Be fundametal compoment through the filtered inverter output voltage of LCL,
Be line voltage,
Be the phase angle difference of inverter output voltage and line voltage,
Secondary side reactance for isolating transformer.According to the power equation of one machine infinity bus system as can be known:
The phase angle difference that changes inverter output voltage and line voltage can change the active power of sending into electrical network, realizes the scheduling feature of electrical network to photovoltaic system.
Photovoltaic cell GV of the present utility model adopts 50 (17) P660*630 polycrystalline silicon solar photovoltaic cell components, and the nominal parameters of single component is: maximum power 50W, open circuit voltage 22V, short circuit current 3.2A, maximum power point voltage 17V, maximum power point electric current 2.94A.0 main certain filtering and pressure stabilization function of DC voltage-stabilizing capacitor C.Inverter DC/AC is the transformation of electrical energy device.
Fig. 4 is the control flow chart of controller, and at first the singlechip chip of controller is analyzed according to sampled result, detects warning messages such as whether overvoltage, overcurrent are arranged; After definite grid-connected system operate as normal, carry out closed-loop control.If AC network need be carried out the scheduling of power, then increase phase angle correction link, control according to the dispatching requirement of electrical network.
Claims (4)
1. the three-phase photovoltaic grid-connected inverting dispatched device based on LCL filtering, it is characterized in that, form by inverter (DC/AC), isolating transformer (T), three filter reactors and three filter capacitors, described three filter reactors and three filter capacitors are connected into three-phase LC filter, the direct-flow input end of described inverter connects the output of photovoltaic cell (GV), and ac output end is connected with electrical network (N) with isolating transformer (T) via the three-phase LC filter that three filter reactors and three filter capacitors are connected into successively.
2. according to the described three-phase photovoltaic grid-connected inverting the dispatched device of claim 1, it is characterized in that the leakage inductance (L of described three-phase LC filter and isolating transformer based on LCL filtering
T1) formation three-phase LCL filter.
3. according to claim 1 or the 2 described three-phase photovoltaic grid-connected inverting dispatched devices, it is characterized in that the phase angle difference control end of described inverter (DC/AC) output voltage and line voltage is connected the signal output part of inverter trigger circuit (CF) based on LCL filtering.
4. according to the described three-phase photovoltaic grid-connected inverting the dispatched device of claim 3, it is characterized in that, all be serially connected with anti-resonant resistance on the branch road of described three filter capacitors based on LCL filtering; The direct-flow input end of described inverter (DC/AC) also is connected to DC voltage-stabilizing electric capacity (C0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020679395XU CN201946990U (en) | 2010-12-24 | 2010-12-24 | Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020679395XU CN201946990U (en) | 2010-12-24 | 2010-12-24 | Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter |
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| Publication Number | Publication Date |
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| CN201946990U true CN201946990U (en) | 2011-08-24 |
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| CN201020679395XU Expired - Fee Related CN201946990U (en) | 2010-12-24 | 2010-12-24 | Schedulable three-phase photovoltaic grid-connected inverter based on inductor-capacitor-inductor (LCL) filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326402A (en) * | 2013-07-08 | 2013-09-25 | 苏州市职业大学 | Dual mode inverter for solar photovoltaic power generation |
| CN105140955A (en) * | 2015-08-14 | 2015-12-09 | 国网天津市电力公司 | Double-full-bridge grid-connected photovoltaic inversion device |
| CN113765346A (en) * | 2021-08-30 | 2021-12-07 | 河北科技大学 | Current source grid-connected inverter based on transformer filtering and double-carrier modulation method thereof |
-
2010
- 2010-12-24 CN CN201020679395XU patent/CN201946990U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326402A (en) * | 2013-07-08 | 2013-09-25 | 苏州市职业大学 | Dual mode inverter for solar photovoltaic power generation |
| CN103326402B (en) * | 2013-07-08 | 2016-03-02 | 苏州市职业大学 | A kind of solar energy power generating dual mode inverter |
| CN105140955A (en) * | 2015-08-14 | 2015-12-09 | 国网天津市电力公司 | Double-full-bridge grid-connected photovoltaic inversion device |
| CN113765346A (en) * | 2021-08-30 | 2021-12-07 | 河北科技大学 | Current source grid-connected inverter based on transformer filtering and double-carrier modulation method thereof |
| CN113765346B (en) * | 2021-08-30 | 2024-03-26 | 河北科技大学 | Current source grid-connected inverter based on transformer filtering and dual-carrier modulation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20131224 |