CN104779828A - High-efficiency photovoltaic grid connected inverter - Google Patents
High-efficiency photovoltaic grid connected inverter Download PDFInfo
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- CN104779828A CN104779828A CN201510182032.2A CN201510182032A CN104779828A CN 104779828 A CN104779828 A CN 104779828A CN 201510182032 A CN201510182032 A CN 201510182032A CN 104779828 A CN104779828 A CN 104779828A
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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 invention discloses a high-efficiency photovoltaic grid connected inverter, and belongs to the technical field of power electronic converters. The high-efficiency photovoltaic grid connected inverter comprises a DSP controller, a first MOS pipe, a second MOS pipe, a transformer, a driving circuit, sampling circuits, an inductor, capacitors and a load, wherein the transformer comprises a primary winding and two secondary windings. In the field of photovoltaic power generation, a DC-DC conversion part is a key part of the inverter; at present, a DC-DC conversion part adopts a hard switching technology generally, so that the electric energy conversion efficiency is too low, and meanwhile, since voltage stress and current stress in a circuit are too high, relatively strong electromagnetic interference is caused. Therefore, an LLC resonant conversion technology is adopted, self parasitic parameters of components are fully used, the voltage stress and the current stress are reduced, a switching frequency can be equal to a resonant frequency, and the conversion efficiency is improved. The high-efficiency photovoltaic grid connected inverter is especially suitable for being used on occasions where requirements on the efficiency of the inverter are relatively high.
Description
Technical field
The invention belongs to converters technical field, particularly relate to a kind of high efficiency photovoltaic combining inverter.
Background technology
Along with the consumption of the resource such as oil, coal, energy starved phenomenon is more and more serious, and the pollution simultaneously caused by it is more and more serious, and create larger impact to the life of the people, health, therefore developing new forms of energy, clean energy resource has been trend of the times.In recent years, solar power generation obtains a large amount of application, and achieves certain benefit.The core component of the photovoltaic inverting system of photovoltaic combining inverter, conventional method adopts power frequency isolation transformer T, thus causes that inverter volume is large, heavy, cost is high, efficiency is low.
Simultaneously existing photovoltaic combining inverter adopts analog element, analog control mode mostly, and advantage is that response is fast, but Shortcomings in many aspects.Such as switching loss is excessive causes the problems such as transducer effciency is low, simultaneously, traditional simulation phase shifted full bridge ZVS converter needs a large amount of discrete components, bring higher cost thus, and connect complicated between analogue device, bring larger difficulty to fault detect and maintenance, and analogue enlargement is subject to environment (as noise, ambient temperature, humidity, vibrations etc.) impact, less stable.
Summary of the invention
The object of the invention is to solve the defects such as existing photovoltaic combining inverter loading range is narrow, cost is high, efficiency is low in above-mentioned prior art, propose a kind of high efficiency photovoltaic combining inverter.
To achieve these goals, the present invention is achieved by the following technical solutions:
A kind of high efficiency photovoltaic combining inverter, comprise DC voltage input end, dsp controller, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, transformer and the load as output, transformer comprises a former limit winding and two vice-side winding; First metal-oxide-semiconductor is connected with the former limit winding of transformer by LLC resonant circuit with the second metal-oxide-semiconductor, and two vice-side winding of transformer are connected with load by current rectifying and wave filtering circuit; The two-way PWM of dsp controller is exported and is connected with the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor respectively by drive circuit, and dsp controller completes the collection of input voltage, output voltage and output current simultaneously.
The drain electrode of described first metal-oxide-semiconductor connects voltage input anode, and the source electrode of the first metal-oxide-semiconductor is connected with the drain electrode of the second metal-oxide-semiconductor, the second metal-oxide-semiconductor source ground; On the both positive and negative polarity of voltage input end after the first electric capacity and the second capacitances in series, and at the two ends of voltage input end; LLC resonant circuit is connected on the tie point of the drain electrode of the tie point of the first electric capacity and the second electric capacity and the source electrode of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor respectively.
Described first metal-oxide-semiconductor and the second metal-oxide-semiconductor are parallel with the first body diode and the second body diode respectively, and the first body diode is connected with the source electrode of the first metal-oxide-semiconductor with the second metal-oxide-semiconductor respectively with the anode of the second body diode, the first body diode is connected with the drain electrode of the first metal-oxide-semiconductor with the second metal-oxide-semiconductor respectively with the negative electrode of the second body diode.
Described LLC resonant circuit comprises resonant inductance and the resonant capacitance of series connection, resonant inductance is connected on the tie point of the first metal-oxide-semiconductor source electrode and the drain electrode of the second metal-oxide-semiconductor, resonant capacitance is connected on the Same Name of Ends of transformer primary side winding, and the different name end of transformer primary side winding is connected on the tie point of the first electric capacity and the second electric capacity.
Described current rectifying and wave filtering circuit comprises the first rectifier diode, the second rectifier diode, filter inductance and output filter capacitor; Transformer secondary first Motor Winding Same Name of Ends is connected with the anode of the first rectifier diode, the first winding different name end and secondary second Motor Winding Same Name of Ends ground connection, and the second winding different name end is connected with the anode of the second rectifier diode; Filter inductance one end is connected with the second rectifier diode negative electrode with the first rectifier diode, as the positive pole of output after the other end is connected with one end of output filter capacitor; The other end ground connection of filter capacitor, load is connected in parallel on the two ends of filter capacitor.
First via mould/number the end of described dsp controller inputs anode by the first voltage sampling circuit and voltage and is connected, second road mould/number end is connected with output plus terminal by the second voltage sampling circuit, and the 3rd road mould/number end is connected to by current sampling circuit between the tie point on transformer secondary first winding different name end and ground.
Compared with prior art, the present invention has following beneficial effect:
The present invention adopts LLC resonant circuit to carry out isolating the volume greatly reducing inversion system, improves efficiency and power density simultaneously.LLC resonant circuit is on traditional series resonant circuit basis, transformer and magnetizing inductance is connected in LLC resonant circuit, forms a LLC resonant circuit.Compare traditional series resonant circuit, owing to adding a resonant inductance, circuit resonant frequencies is reduced, the switch tube zero voltage switch that just can realize in full-load range without the need to using extra auxiliary network; Secondly, transformer secondary rectifier diode with good conditionsily can be operated in zero voltage turn-off, reduces the loss that diode reverse recovery produces.Loading range of the present invention is wide, efficiency is high, and when loading range can reach 10%-100%, 10% load, efficiency reaches 70%, reaches more than 90% during more than 60% load; Cost of the present invention is low, samples digital controlly to decrease a large amount of analogue devices, and circuit reliability is high simultaneously, controls the voltage overshoot in circuit, ensures circuit reliably working; When circuit generation overcurrent, overvoltage, under-voltage time, protection to circuit can be realized by lockout switch pipe.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention;
Fig. 2 is the oscillogram of boost mode circuit work of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is described in detail.
See Fig. 1, the present invention includes: dsp controller, the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, transformer TT, drive circuit, sample circuit, inductance, electric capacity, load, transformer T comprises a former limit winding and two vice-side winding.
First metal-oxide-semiconductor Q1 drain electrode connects input anode, and the source electrode of the first metal-oxide-semiconductor Q1 is connected with the drain electrode of the second metal-oxide-semiconductor Q2, the second metal-oxide-semiconductor Q2 source ground; The two-way PWM of dsp controller is exported and is connected with the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 grid respectively by drive circuit, first via mould/number the end of dsp controller is connected with input anode by the first voltage sampling circuit, second road mould/number end is connected with output plus terminal by the second voltage sampling circuit, and the 3rd road mould/number end is connected to by current sampling circuit between the tie point on transformer T secondary first winding different name end and ground.The Same Name of Ends of the former limit winding of transformer T is connected by the source electrode of leakage inductance with the first metal-oxide-semiconductor Q1, and different name end is connected with the tie point of the first electric capacity C1 and the second electric capacity C2; Transformer T secondary first Motor Winding Same Name of Ends is connected with the anode of the first rectifier diode D3, and different name end is connected with secondary ground with transformer T secondary second Motor Winding Same Name of Ends; Transformer T secondary second winding different name end is connected with the second rectifier diode D4 anode.Filter inductance Lf one end is connected with the negative electrode of the first rectifier diode D3 negative electrode, the second rectifier diode D4, and the other end is connected with low-pressure end, and output filter capacitor Cf one end is connected with output cathode, and the other end is connected to ground, and load R is connected between positive negative output.The switching frequency of switching tube of the present invention equals resonance frequency, and resonance current is pure sine wave, the output current critical continuous mode of secondary side rectification circuit, and root-mean-square value is minimum, and switching tube conduction loss is minimum, and circuit efficiency is the highest.
Principle of the present invention and the course of work:
The present invention takes full advantage of element self parasitic parameter, reduce voltage, current stress, Sofe Switch can be realized in the loading range of non-constant width, increase conversion efficiency, the isolation of low-pressure end and high-pressure side is achieved by transformer T, achieve DC-isolation by sample circuit and drive circuit, be specially adapted to the occasion higher to transducer effciency requirement.
As shown in Figure 1, be described in detail to operation principle of the present invention, two switching tubes, 180 ° of complementary conductings and centre exists dead band, to prevent from leading directly to, regulate the size of duty ratio can regulate output voltage.LLC resonant circuit has two resonance frequencys, and one is the resonance frequency fr of resonant inductance Lr and resonant capacitance Cr, and another is the resonance frequency fm that magnetizing inductance Lm adds resonant inductance Lr and resonant capacitance Cr.LLC circuit can be divided into four kinds of patterns according to switching frequency range, operation principle under fr>fs>fm pattern is only discussed herein, in a switch periods, the whole course of work is as described below, circuit working waveform as shown in Figure 2:
During t1-t2:t=t0, resonance current is negative, the body diode conducting of the first metal-oxide-semiconductor Q1, and the first metal-oxide-semiconductor Q1 both end voltage is zero, and now the first metal-oxide-semiconductor Q1 is no-voltage conducting.Energy flows to the first electric capacity C1, the second electric capacity C2 mid point from positive source, resonant inductance Lr and resonant capacitance Cr resonance, resonance current ILr is through the first metal-oxide-semiconductor Q1 and rise gradually with sinusoidal form, the electric current I T flowing through the former limit of transformer T is the difference of resonance current ILr and exciting current ILm, just lower negative in transformer T original edge voltage polarity, secondary polarity is also upper just lower negative, therefore the first rectifier diode D3 nature conducting, and transformer T original edge voltage is clamped at nV0.(n is transformer T no-load voltage ratio), exciting current linearly rises.
During t2-t3:t=t2, the first metal-oxide-semiconductor Q1 turns off, and now the second metal-oxide-semiconductor Q2 is also in off state, and circuit enters Dead Time.Resonance current ILr discharges to the junction capacitance of the second metal-oxide-semiconductor Q2, when its voltage drops to zero, and body diode conducting, transformer T former limit winding polarity become upper negative under just, the conducting of secondary second rectifier diode D4 nature, magnetizing inductance Lm voltage is output voltage clamping, no longer participates in resonance.Resonance current starts to reduce, and exciting current linearly reduces.T3 moment second metal-oxide-semiconductor Q2 no-voltage is open-minded.
T3-t4: when t=t4, the second metal-oxide-semiconductor Q2 no-voltage is open-minded, similar with the first stage, and resonant inductance Lr and resonant capacitance Cr resonance, resonance current reduces with sinusoidal form, and exciting current linearly reduces.T4 moment resonance current equals exciting current;
T4-t5: when t=t4, transformer T original edge voltage is zero, and secondary rectifier diode all ends, and former limit no longer provides energy to secondary, and magnetizing inductance is no longer output voltage clamping, starts to participate in resonance.LLC resonance current is substantially constant;
T5-t6: similar with t2-t3 stage, circuit enters Dead Time, first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 all turn off, resonance current ILr charges to the junction capacitance of the first metal-oxide-semiconductor Q1, when its voltage equals supply voltage, and body diode conducting, just lower negative on the winding polarity of transformer T former limit, the conducting of secondary first rectifier diode D3 nature, magnetizing inductance Lm voltage is output voltage clamping, no longer participates in resonance.
In t1-t2 stage and t4-t5 stage, suppose that resonance current is constant, be set to Im, then output voltage U0 can be expressed as:
In formula: Uin is input voltage; T is switch periods; Harmonic period when Ts is Lr and Cr resonance.As can be seen from formula, as T=Ts and fr=fs, t1-t2 stage and t4-t5 stage will not exist in this case, and resonance current is pure sine wave, secondary side rectification circuit output current critical continuous mode, root-mean-square value is minimum, and switching tube conduction loss is minimum, and circuit efficiency is the highest.So, when LLC circuit working is in resonance frequency, most effective.The Main Function of LLC circuit is isolated exactly herein, and the basis ensureing isolation will make most effective, therefore the present invention makes the switching frequency of switching tube equal resonance frequency.
System adopts high performance dsp controller chip to carry out detecting, controlling; sample circuit is sampled to voltage, electric current; sampled data carries out analog-to-digital conversion, and dsp controller chip processes data, thus regulates the duty of PWM; PWM switch tube after drive circuit controls; output is regulated, if sampled data is abnormal, illustrates that circuit there occurs fault; now can block all switching tubes, realize the protection to circuit.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (6)
1. a high efficiency photovoltaic combining inverter, it is characterized in that: comprise DC voltage input end (Vin), dsp controller, the first metal-oxide-semiconductor (Q1), the second metal-oxide-semiconductor (Q2), transformer (T) and the load (R) as output, transformer (T) comprises a former limit winding and two vice-side winding; First metal-oxide-semiconductor (Q1) is connected with the former limit winding of transformer (T) by LLC resonant circuit with the second metal-oxide-semiconductor (Q2), and two vice-side winding of transformer (T) are connected with load (R) by current rectifying and wave filtering circuit; The two-way PWM of dsp controller is exported and is connected with the grid of the first metal-oxide-semiconductor (Q1) and the second metal-oxide-semiconductor (Q2) respectively by drive circuit, and dsp controller completes the collection of input voltage, output voltage and output current simultaneously.
2. high efficiency photovoltaic combining inverter according to claim 1, it is characterized in that: the drain electrode of described first metal-oxide-semiconductor (Q1) connects voltage input anode, the source electrode of the first metal-oxide-semiconductor (Q1) is connected with the drain electrode of the second metal-oxide-semiconductor (Q2), the second metal-oxide-semiconductor (Q2) source ground; After on the both positive and negative polarity of voltage input end (Vin), the first electric capacity (C1) and the second electric capacity (C2) are connected, and at the two ends of voltage input end (Vin); LLC resonant circuit is connected on the tie point of the drain electrode of the first electric capacity (C1) and the tie point of the second electric capacity (C2) and the source electrode of the first metal-oxide-semiconductor (Q1) and the second metal-oxide-semiconductor (Q2) respectively.
3. high efficiency photovoltaic combining inverter according to claim 1 and 2, it is characterized in that: described first metal-oxide-semiconductor (Q1) and the second metal-oxide-semiconductor (Q2) are parallel with the first body diode (D1) and the second body diode (D2) respectively, and the first body diode (D1) is connected with the source electrode of the first metal-oxide-semiconductor (Q1) with the second metal-oxide-semiconductor (Q2) respectively with the anode of the second body diode (D2), first body diode (D1) is connected with the drain electrode of the first metal-oxide-semiconductor (Q1) with the second metal-oxide-semiconductor (Q2) respectively with the negative electrode of the second body diode (D2).
4. high efficiency photovoltaic combining inverter according to claim 2, it is characterized in that: described LLC resonant circuit comprises resonant inductance (Lr) and the resonant capacitance (Cr) of series connection, resonant inductance (Lr) is connected on the tie point that the first metal-oxide-semiconductor (Q1) source electrode and the second metal-oxide-semiconductor (Q2) drain, resonant capacitance (Cr) is connected on the Same Name of Ends of transformer (T) former limit winding, and the different name end of transformer (T) former limit winding is connected on the tie point of the first electric capacity (C1) and the second electric capacity (C2).
5. high efficiency photovoltaic combining inverter according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises the first rectifier diode (D3), the second rectifier diode (D4), filter inductance (Lf) and output filter capacitor (Cf); Transformer (T) secondary first Motor Winding Same Name of Ends is connected with the anode of the first rectifier diode (D3), first winding different name end and secondary second Motor Winding Same Name of Ends ground connection, the second winding different name end is connected with the anode of the second rectifier diode (D4); Filter inductance (Lf) one end is connected with the second rectifier diode (D4) negative electrode with the first rectifier diode (D3), as the positive pole of output after the other end is connected with one end of output filter capacitor (Cf); The other end ground connection of filter capacitor (Cf), load (R) is connected in parallel on the two ends of filter capacitor (Cf).
6. the high efficiency photovoltaic combining inverter according to claim 1 any one, it is characterized in that: the first via mould/number end of described dsp controller inputs anode by the first voltage sampling circuit and voltage and is connected, second road mould/number end is connected with output plus terminal by the second voltage sampling circuit, and the 3rd road mould/number end is connected to by current sampling circuit between the tie point on transformer (T) secondary first winding different name end and ground.
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Cited By (11)
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| CN107332444A (en) * | 2017-09-01 | 2017-11-07 | 深圳市英威腾电气股份有限公司 | A kind of LLC converters and its control circuit |
| CN107612160A (en) * | 2017-10-27 | 2018-01-19 | 西北工业大学 | A kind of magnetic coupling parallel resonance formula wireless electric energy transmission device |
| CN107733234A (en) * | 2017-09-19 | 2018-02-23 | 昆明理工大学 | A kind of asymmetric control circuit and its control method suitable for the synchronous rectifier of resonant network half |
| CN107834816A (en) * | 2017-11-07 | 2018-03-23 | 深圳威迈斯电源有限公司 | Two-stage multi-channel parallel flow equalizing circuit, current equalizing method, storage device and mobile terminal |
| CN109361238A (en) * | 2018-12-04 | 2019-02-19 | 哈尔滨理工大学 | Photovoltaic array structure based on LLC resonant converter voltage compensation |
| CN109842302A (en) * | 2019-02-15 | 2019-06-04 | 矽力杰半导体技术(杭州)有限公司 | Series resonant converter and its primary side feedback control circuit and control method |
| CN110896211A (en) * | 2019-11-29 | 2020-03-20 | 深圳市科华恒盛科技有限公司 | Resonant circuit abnormality control circuit, control method and resonant device |
| CN111146949A (en) * | 2019-12-25 | 2020-05-12 | 中国长城科技集团股份有限公司 | Control method and system of LLC resonant circuit |
| CN113708627A (en) * | 2021-07-26 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Resonant converter |
| CN114244136A (en) * | 2021-12-20 | 2022-03-25 | 上海北漠景观幕墙科技股份有限公司 | Photovoltaic curtain wall system based on photovoltaic building integration |
| CN114342239A (en) * | 2020-08-17 | 2022-04-12 | 华为技术有限公司 | Energy recovery auxiliary circuit for DC/DC resonant power converter topology |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332444A (en) * | 2017-09-01 | 2017-11-07 | 深圳市英威腾电气股份有限公司 | A kind of LLC converters and its control circuit |
| CN107733234A (en) * | 2017-09-19 | 2018-02-23 | 昆明理工大学 | A kind of asymmetric control circuit and its control method suitable for the synchronous rectifier of resonant network half |
| CN107612160B (en) * | 2017-10-27 | 2023-08-18 | 西北工业大学 | Magnetic coupling parallel resonance type wireless power transmission device |
| CN107612160A (en) * | 2017-10-27 | 2018-01-19 | 西北工业大学 | A kind of magnetic coupling parallel resonance formula wireless electric energy transmission device |
| CN107834816A (en) * | 2017-11-07 | 2018-03-23 | 深圳威迈斯电源有限公司 | Two-stage multi-channel parallel flow equalizing circuit, current equalizing method, storage device and mobile terminal |
| CN109361238A (en) * | 2018-12-04 | 2019-02-19 | 哈尔滨理工大学 | Photovoltaic array structure based on LLC resonant converter voltage compensation |
| CN109842302A (en) * | 2019-02-15 | 2019-06-04 | 矽力杰半导体技术(杭州)有限公司 | Series resonant converter and its primary side feedback control circuit and control method |
| CN110896211A (en) * | 2019-11-29 | 2020-03-20 | 深圳市科华恒盛科技有限公司 | Resonant circuit abnormality control circuit, control method and resonant device |
| CN110896211B (en) * | 2019-11-29 | 2022-05-24 | 深圳市科华恒盛科技有限公司 | Resonant circuit abnormality control circuit, control method and resonant device |
| CN111146949A (en) * | 2019-12-25 | 2020-05-12 | 中国长城科技集团股份有限公司 | Control method and system of LLC resonant circuit |
| CN114342239A (en) * | 2020-08-17 | 2022-04-12 | 华为技术有限公司 | Energy recovery auxiliary circuit for DC/DC resonant power converter topology |
| CN113708627A (en) * | 2021-07-26 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Resonant converter |
| CN114244136A (en) * | 2021-12-20 | 2022-03-25 | 上海北漠景观幕墙科技股份有限公司 | Photovoltaic curtain wall system based on photovoltaic building integration |
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