CN103501020A - Hybrid power supply system consisting of mains supply network and photovoltaic assembly and control method thereof - Google Patents

Hybrid power supply system consisting of mains supply network and photovoltaic assembly and control method thereof Download PDF

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Publication number
CN103501020A
CN103501020A CN201310475953.9A CN201310475953A CN103501020A CN 103501020 A CN103501020 A CN 103501020A CN 201310475953 A CN201310475953 A CN 201310475953A CN 103501020 A CN103501020 A CN 103501020A
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load
output
power
phase
electricity network
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龙波
胡天友
李迅波
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention provides a hybrid power supply system consisting of a mains supply network and a photovoltaic assembly. The hybrid power supply system comprises a photovoltaic array and a mains supply network, wherein the output of the photovoltaic array is connected with a single-phase DC/AC (Direct Current to Alternating Current) converter, a high-frequency transformer and a rectifier bridge in sequence; the mains supply network is connected with a single-phase AC/DCPWM (Alternating Current to Direct Current Pulse Width Modulation) rectifier and a bilateral DC/DC (Direct Current to Direct Current) chopper in sequence; the output end of the rectifier bridge is connected in parallel with the output end of the bilateral DC/DC chopper. The hybrid power supply system has the beneficial effects that best matching of a solar photovoltaic assembly and four working ways of the mains supply is realized, and the aim of fully utilizing solar energy resources is fulfilled. Moreover, via the direct-current power supply output provided by the invention, the system is more reliable, and solar energy is utilized more efficiently.

Description

Hybrid power system and control method thereof that electricity network and photovoltaic module form
Technical field
The invention belongs to the solar-photovoltaic technology field, relate to solar energy power generating and civil power composite power supply technology, relate in particular to a kind of electricity network and the hybrid power system of solar photovoltaic assembly composition and the control method of this system.
Background technology
Along with socioeconomic development, people are increasing to the demand of the energy, and the non-renewable energy resources such as fossil energy are just day by day exhausted, and the environmental pollution that caused in use is day by day serious.Meanwhile, as the clean also solar energy of regenerative resource, progressively become focus, its low cost, the high efficiency technology of utilizing also become the technical research focus in field.Solar energy utilize mode a lot, wherein too can photovoltaic generation be a main and mature technology, core is that by solar-energy photo-voltaic cell, solar energy being converted to electric energy directly is used.To be external characteristic curve change with the variation of light intensity and temperature the maximum characteristic of solar-energy photo-voltaic cell, in order to maximally utilise solar energy (raising photoelectric conversion efficiency), the DC converter that need to be attached thereto can be controlled the output of solar-energy photo-voltaic cell constantly, and it is operated near maximum power point.
But, due to exist (such as south and the north, daytime and the night etc.) of the destabilizing factors such as the uneven also temporal evolution of intensity of illumination spatial distribution, the independent electric power system of solar energy proposed at present can't be worked sustainedly and stably in proof load, directly has influence on applying of photovoltaic technology.In order to use fully solar energy under the prerequisite at the proof load steady operation, someone has proposed to increase the scheme (being that solar energy is combined electric power system with civil power) of accessory power supply, and wherein accessory power supply for supplementing the electric energy of this part deficiency when photovoltaic can't meet the load supplying needs.
Solar energy is combined electric power system and is selected the civil power energy as a supplement with civil power, by photovoltaic, with civil power, combined for load supplying, can be referring to patent (patent No. 201010263033.7).This system is comprised of photovoltaic cell, mains supply, DC-DC converter and power factor correcting converter usually, for there being two power supply problems, formulate the energy management control program and guarantee the co-ordination of two power supply energy, operating state according to solar cell and load, determine the working method that control system is suitable, with this, carry out the energy flow of control system.The disclosed a kind of photovoltaic of the patent of invention that for example patent No. is 201010263033.7 is combined electric power system and control method thereof with civil power.The associating electric power system of this scheme realized solar-energy photo-voltaic cell array generation deficiency so that the required electric energy of load to be provided again mains supply automatically supplement the function with proof load work.But in actual applications, usually can be because intensity of illumination increase or be responsible for power to reduce and the photovoltaic battery array superfluous situation of generating electricity occurs, if adopt above-mentioned associating electric power system, this part superfluous electric energy will be wasted.
Summary of the invention
The present invention can not effectively utilize the deficiency of the dump energy that photovoltaic array sends out in order to solve existing solar energy and civil power associating electric power system, has proposed a kind of civil power and the hybrid power system of solar photovoltaic assembly composition and the control method of this hybrid power system.
To achieve these goals, technical scheme of the present invention is: the hybrid power system that electricity network and photovoltaic module form, comprise photovoltaic array and electricity network, it is characterized in that, photovoltaic array output connects single-phase DC/AC converter, high frequency transformer and rectifier bridge successively, electricity network connects single-phase AC/DC PWM rectifier and two-way DC/DC chopper successively, and the output of rectifier bridge is in parallel with the output of two-way DC/DC chopper.
Further, the output of described photovoltaic array is connected with filtering capacitor.Described output is serially connected with the protection diode.
Further, the output of described two-way DC/DC chopper and rectifier bridge is connected with filter circuit, and described filter circuit is specially the LC filter.
Further, described rectifier bridge is specially single-phase uncontrollable diode rectifier bridge.
Further, described single-phase AC/DC PWM rectifier is two-way unity power factor AC/DC PWM controlled rectification/inverter.
A kind of method of controlling above-mentioned hybrid power system, is characterized in that, comprises step:
A, computational load power P loadwith photovoltaic array peak power output P pV;
B, monitor-type P load-P pVvalue, if value is greater than 0 execution step c, equal 0 execution step d, be less than 0 execution step e;
C, control photovoltaic array power to the load with peak power output, and electricity network is output power value P simultaneously load-P pVsupplement, then return to step b;
D, control photovoltaic array power to the load with peak power output, cut off the electricity network current supply circuit simultaneously, then return to step b;
E, control photovoltaic array are with performance number P loadpower to the load, simultaneously with performance number P pV-P loadto the electricity network feed, then return to step b.
Wherein, the control procedure of step c is as follows:
C1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop electricity network is with performance number P simultaneously load-P pVoutput is to load;
The output signal of c2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
The control procedure of steps d is as follows:
D1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize the electricity network no-output by the two-way DC/DC chopper of controlling the electricity network loop simultaneously;
The output signal of d2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
The control procedure of step e is as follows:
E1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop rectification bridge output end is with performance number P simultaneously pV-P loadto the electricity network feed;
The output signal of e2, single-phase DC/AC converter is exported successively after high frequency transformer isolation boosting and rectifier bridge rectification, wherein performance number P pV-P loadsignal successively through two-way DC/DC chopper boost and single-phase AC/DC PWM rectifier inversion rear feed to electricity network.
Especially, when night or illumination condition when too poor, the peak power output P of photovoltaic array pVbe 0, now perform step c, by electricity network, provide load required whole electric energy.
Beneficial effect of the present invention: hybrid power system of the present invention is by adopting the parts such as two-way DC/DC chopper, two-way unity power factor AC/DC PWM controlled rectification/inverter to connect the electricity network loop, and in conjunction with corresponding control method, realized the optimum Match of four kinds of working methods of solar photovoltaic assembly and civil power having reached the purpose that takes full advantage of solar energy resources.Wherein four kinds of mode of operations and advantage are as follows: 1, when in the solar energy abundance, and when MPPT controls power output and is greater than the required power of load, can be grid-connected by two-way DC/DC chopper and single-phase AC/DC PWM rectifier, realize the recycling of energy; 2, when MPPT control power output is less than the load power demand, can start again civil power (electricity network) work, by powering to the load after Single-phase PWM Rectifier (two-way unity power factor AC/DC PWM controlled rectification/inverter) and two-way DC/DC converter (two-way DC/DC chopper) control output.3, when MPPT control power output equals the load power demand, electricity network stops load supplying, by solar energy, is supplied with fully; 4,, when photovoltaic cell group inverter section fault or night and illumination condition when too poor, the work of automatically starting civil power, independently power to the load.And DC power supply output provided by the invention, make system more reliable, and more effectively utilized solar energy.
The accompanying drawing explanation
Fig. 1 is the hybrid power system control method flow chart of the embodiment of the present invention;
Fig. 2 is the concrete grammar that in Fig. 1 method, PV array and civil power power to the load jointly;
Fig. 3 is the concrete grammar that in Fig. 1 method, the PV array powers to the load separately;
Fig. 4 is that in Fig. 1 method, the PV array powers to the load separately simultaneously to a concrete grammar of electricity network feed;
Fig. 5 is a preferred embodiment of hybrid power system control method of the present invention;
Fig. 6 is hybrid power system block diagram of the present invention;
Fig. 7 is hybrid power system circuit diagram of the present invention, and wherein A is hardware circuit part, and B is central control board;
Fig. 8 is the independently-powered mode schematic diagram of hybrid power system electricity network of the present invention;
Fig. 9 is hybrid power system photovoltaic array of the present invention and electricity network composite power supply mode schematic diagram;
Figure 10 is hybrid power system photovoltaic array supply power mode schematic diagram of the present invention;
Figure 11 is that hybrid power system photovoltaic array of the present invention powers to the load simultaneously to electricity network feeding classification schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Be illustrated in figure 6 a specific embodiment of hybrid power system of the present invention, the hybrid power system that the electricity network of the present embodiment and photovoltaic module form, comprise photovoltaic array and electricity network.Here alleged electricity network refers to 220V AC single phase utility grid.Described photovoltaic array output connects single-phase DC/AC converter, high frequency transformer and rectifier bridge successively, sunlight after the photovoltaic array opto-electronic conversion at output with the direct current formal output, this direct current signal is transformed to interchange through single-phase DC/AC converter (being inverter), and form and export through the rectifier bridge rectification again after the high frequency transformer transformation, this output connects DC load, for it provides electric energy.The uncontrollable diode rectifier bridge of the preferred individual event of the rectifier bridge here.Electricity network connects single-phase AC/DC PWM rectifier and two-way DC/DC chopper successively, the output of rectifier bridge is in parallel with the output of two-way DC/DC chopper, and wherein single-phase AC/DC PWM rectifier is two-way unity power factor AC/DC PWM controlled rectification/inverter.For preventing current reflux, regulated output voltage, filtering circuit clutter damage the situation generations such as circuit, following preferred implementation has further been proposed on the basis of above-described embodiment: 1, at the output of photovoltaic array and connect filtering capacitor, and be serially connected with the protection diode at its output; 2, the output of two-way DC/DC chopper and rectifier bridge is connected filter circuit, and described filter circuit is preferably the LC filter; 3, described rectifier bridge is specially single-phase uncontrollable diode rectifier bridge.Specifically referring to circuit shown in A in Fig. 7.In addition, in Fig. 7, B is depicted as the central control board of circuit shown in A, for controlling the wherein mode of operation of single-phase DC/AC converter, single-phase AC/DC PWM rectifier and two-way DC/DC chopper, realizes the switching controls of this hybrid power system mode of operation.
Fig. 1 shows the method for the above-mentioned hybrid power system of control of the present invention, specifically comprises the following steps:
A, computational load power P loadwith photovoltaic array peak power output P pV;
B, monitor-type P load-P pVvalue, if value is greater than 0 execution step c, equal 0 execution step d, be less than 0 execution step e;
C, control photovoltaic array power to the load with peak power output, and electricity network is output power value P simultaneously load-P pVsupplement, then return to step b;
D, control photovoltaic array power to the load with peak power output, cut off the electricity network current supply circuit simultaneously, then return to step b;
E, control photovoltaic array are with performance number P loadpower to the load, simultaneously with performance number P pV-P loadto the electricity network feed, then return to step b.
Wherein, as shown in Figure 2, concrete steps are as follows for the preferred control procedure of step c:
C1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop electricity network is with performance number P simultaneously load-P pVoutput is to load; The control procedure of its power division is the P according to calculating by central control board loadand P pVqr1, Qr2, Qr3, Qr4 and Qs1, Qs2, Qs3, Qs4, Qs5 that value is adjusted single-phase DC/AC converter, single-phase AC/DC PWM rectifier and two-way DC/DC chopper realize, wherein the adjustment mode of single-phase DC/AC converter are preferably to SPWM adjustment.
The output signal of c2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
Be illustrated in figure 3 a preferred control procedure of steps d, concrete steps are as follows:
D1, employing SPWM mode are controlled the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize the electricity network no-output by the two-way DC/DC chopper of controlling the electricity network loop simultaneously;
The output signal of d2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
The preferred implementation that flow process shown in Fig. 4 is step e in control method of the present invention, its control procedure is as follows:
E1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop rectification bridge output end is with performance number P simultaneously pV-P loadto the electricity network feed;
The output signal of e2, single-phase DC/AC converter is exported successively after high frequency transformer isolation boosting and rectifier bridge rectification, wherein performance number P pV-P loadsignal successively through two-way DC/DC chopper boost and single-phase AC/DC PWM rectifier inversion rear feed to electricity network.
Especially, when night or illumination condition when too poor, the peak power output P of photovoltaic array pVbe 0, now perform step c, by electricity network, provide load required whole electric energy.
In order clearerly to show principle of the present invention, below in conjunction with specific embodiment and accompanying drawing, the course of work of the present invention, principle are comprised to technical scheme is further described.
As shown in Fig. 1, Fig. 5 and Fig. 8 to Figure 11, the output of described photovoltaic array connects by single-phase full control DC/AC converter, single-phase DC/AC converter is connected with high-frequency isolation transformer, by the high-frequency isolation transformer isolation boosting, high-frequency isolation transformer is connected with the uncontrollable diode rectifier of AC/DC, carries out rectification and exports to DC load by the LC filter filtering.Civil power is by single-phase AC/DC BOOST-PFC PWM rectifier output, and this single-phase AC/DC BOOST-PFC PWM rectifier is connected with the DC/DC chopper, and the DC/DC chopper is connected with the LC filter, and the LC filter connects DC load; Civil power Vg carries out the unity power factor rectification of boosting by the single-phase BOOST-PFC rectifier of AC/DC, after two-way DC/DC Chopper Regulators, is attempted by DC power supply output.As concrete mode, single-phase full control DC/AC converter comprises QR1, QR2, and QR3, QR4 high-frequency inversion switching tube, the control utmost point of described switching tube connects central control board.The uncontrollable diode rectifier of AC/DC comprises DR1, DR2, and DR3, the uncontrollable diode of DR4, four uncontrollable diodes form bridge rectifier; Single-phase AC/DCBOOST-PFC PWM rectifier comprises QS1, QS2, QS3, QS4 commutation inversion switching tube, the control utmost point of this switching tube connects central control board, realize the rectification control of unity power factor, 220VAC is boosted to 390-400VDC, wherein 220VAC boosts to the conventional parameter that 390-400VDC belongs to this area.The DC/DC chopper comprises QS5 and the QS6 that is respectively step-down and boost chopper control use switching tube, two connectionist's central control boards.Above-mentioned concrete annexation can be with reference to Fig. 7.
The hybrid power system of the embodiment of the present invention can realize following four kinds of working methods in conjunction with its control method:
Mode 1. ,You city net is as shown in Figure 8 powered separately to load through compensation circuit:
Single-phase electricity network provides the 220V power supply, through H bridge PWM rectifier (by QS1, QS2, QS3, QS4) control, realize the rectification control of unity power factor, 220VAC is boosted to 390-400VDC, then, control via QS5, realize buck chopper control, output voltage (the 0-390V gamut is adjustable);
Mode 2. as shown in Figure 9, is combined load supplying by civil power and photovoltaic module:
The photovoltaic cell group through single-phase full-bridge inverter (by power device QR1, QR2, QR3, QR4) control, when realizing that MPPT maximum power point tracking (MPPT) is controlled, boost by interior High Frequency Link transformer isolation, through uncontrollable diode rectification (DR1, DR2, DR3, DR4) load is powered after filtering;
Single-phase civil power 220V, through H bridge PWM rectifier (by QS1, QS2, QS3, QS4) control, realize that the rectification of unity power factor is controlled, and 220VAC is boosted to 390-400VDC, then, control via QS5, realize buck chopper control, (the 0-390V gamut is adjustable for output voltage, regulate according to the photovoltaic array peak power output and the bearing power value that detect for central control unit, concrete basis principle is algebraic expression P load-P pVsymbol).
As shown in figure 10, photovoltaic module is independent of load supplying for mode 3.:
The photovoltaic cell group through single-phase full-bridge inverter (by power device QR1, QR2, QR3, QR4) control, when realizing that MPPT maximum power point tracking (MPPT) is controlled, boost by interior High Frequency Link transformer isolation, through uncontrollable diode rectification (DR1, DR2, DR3, DR4) load is powered after filtering;
As shown in figure 11, photovoltaic module is independent to be realized to the electrical network feed to load supplying the time mode 4.:
The photovoltaic cell group through single-phase full-bridge inverter (by power device QR1, QR2, QR3, QR4) control, when realizing that MPPT maximum power point tracking (MPPT) is controlled, boost by interior High Frequency Link transformer isolation, through uncontrollable diode rectification (DR1, DR2, DR3, DR4) load is powered after filtering.Now, because the power output after photovoltaic module MPPT control is greater than the required power of load, Qs6 carries out the PWM modulation, this portion of energy is carried out to boost chopper control, then pass through (QS1, QS2, QS3, QS4) control, realize that the inversion grid connection of unity power factor is controlled, thereby saved this portion of energy.
Operation principle of the present invention is:
At first by city's net (electricity network), through compensation circuit (electricity network current supply circuit), all power to load, and make the load both end voltage stable, then the photovoltaic array current supply circuit is incorporated to load, constantly gather output voltage and the electric current of solar panel, by calculating instantaneous power, realized again the maximal power tracing of phase shifting full bridge soft switch by method of perturbation, due to adding of solar energy, make load voltage raise, because major loop is comprised of uncontrollable diode, so energy can not pour in down a chimney, load voltage rises, voltage stabilization closed loop by compensation circuit, change the duty ratio of commutation circuit, just can reduce the access electric current of city's net, the voltage effective value that is deducted the power Zai Chuyu city net of solar energy by bearing power is exactly city's current on line side effective value now, when this value is greater than 0, illustrate that city's net is providing energy, and be less than at 0 o'clock, illustrate that solar energy is at energy feeding.This electric current just can be used as the basis for estimation of energy flow direction.
When the solar energy power output is less than the required rate of load merit, now powering load is simultaneously netted in solar energy and city, in order to realize the maximum power factor of PWM rectifier, need to use current inner loop to follow the tracks of phase-locked city net phase place, so just formed the outer voltage voltage stabilizing, the control loop that current inner loop is phase-locked, the voltage stabilizing of outer voltage can realize by controlling the DC chopper circuit duty ratio.
When the photo-voltaic power supply power output equals, now turn-off DC chopper circuit, even duty ratio is 0; Now be equivalent to only have solar energy to cut off at power supply ,Jiang city net.
When the photo-voltaic power supply power output is greater than, cut off net loop, city owing to equating before, so load voltage rises, control by outer voltage, make the half-bridge chopper circuit work in the BOOST form, now by single-phase full bridge full-control type inverter, start grid-connected, owing to will realizing the grid-connected DC-side Voltage Stabilization that just must allow the PWM rectifier and being greater than the peak value of city's net, (so can set the half-bridge chopper circuit is fixing duty ratio, thereby is equivalent to commutator transformer); Interior ring is still used Direct Current Control, realizes phase-locked and realizes grid-connected maximum power factor.
The composite power supply system of the embodiment of the present invention is compared and is had following different and advantage from the associating electric power system in background technology:
(1), be output as AC load in background technology, be 220V, its output voltage is AC signal.In the present embodiment, be output as DC load, and output voltage lower (0-390V).
(2), in background technology, working method is three kinds: be specially; Photovoltaic module powers to the load separately, and photovoltaic module and civil power power to the load jointly, and civil power independently powers to the load.And the working method of the present embodiment has four kinds, except above-mentioned three kinds, this patent can also be realized when output power of photovoltaic module is greater than the load power demand, to the generating of civil power energy regenerative, reaches single-phase grid-connected generating, and this function is completed by the DC/DC chopper.
The present embodiment has taken into full account the various working methods (four kinds) of solar photovoltaic assembly and civil power, has reached the optimum Match of two kinds of energy.When in the solar energy abundance, when MPPT controls power output and is greater than the required power of load, can be grid-connected by BOOST converter and Single-phase PWM Inverter, realized the recycling of energy; When MPPT control power output is less than the load power demand, can start civil power work again, by powering to the load after Single-phase PWM Rectifier and the output of two-way DC/DC convertor controls; When MPPT control power output equals the load power demand, civil power quits work, and by solar energy, is supplied with fully; When photovoltaic cell group inverter section fault, the work of automatically starting civil power, independently power to the load.
In sum, the output of DC power supply that this patent provides can be so that system be more reliable, and has more effectively utilized solar energy.
The foregoing is only the specific embodiment of the present invention, one skilled in the art will appreciate that and can carry out various modifications, replacement and change to the present invention in the disclosed technical scope of the present invention.Therefore the present invention should not limited by above-mentioned example, and should limit with the protection range of claims.

Claims (10)

1. the hybrid power system that electricity network and photovoltaic module form, comprise photovoltaic array and electricity network, it is characterized in that, photovoltaic array output connects single-phase DC/AC converter, high frequency transformer and rectifier bridge successively, electricity network connects single-phase AC/DC PWM rectifier and two-way DC/DC chopper successively, and the output of rectifier bridge is in parallel with the output of two-way DC/DC chopper.
2. hybrid power system according to claim 1, is characterized in that, the output of described photovoltaic array is connected with filtering capacitor.
3. hybrid power system according to claim 1 and 2, is characterized in that, the output of described photovoltaic array is serially connected with the protection diode.
4. hybrid power system according to claim 1, is characterized in that, the output of described two-way DC/DC chopper and rectifier bridge is connected with filter circuit, and described filter circuit is specially the LC filter.
5. hybrid power system according to claim 1, is characterized in that, described rectifier bridge is specially single-phase uncontrollable diode rectifier bridge.
6. according to the described hybrid power system of any one claim of claim 1 to 5, it is characterized in that, described single-phase AC/DC PWM rectifier is two-way unity power factor AC/DC PWM controlled rectification/inverter.
7. the control method of the hybrid power system of a claim 1 to 6, is characterized in that, comprises step:
A, computational load power P loadwith photovoltaic array peak power output P pV;
B, monitor-type P load-P pVvalue, if value is greater than 0 execution step c, equal 0 execution step d, be less than 0 execution step e;
C, control photovoltaic array power to the load with peak power output, and electricity network is output power value P simultaneously load-P pVsupplement, then return to step b;
D, control photovoltaic array power to the load with peak power output, cut off the electricity network current supply circuit simultaneously, then return to step b;
E, control photovoltaic array are with performance number P loadpower to the load, simultaneously with performance number P pV-P loadto the electricity network feed, then return to step b.
8. method according to claim 7, is characterized in that, the control procedure of step c is as follows:
C1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop electricity network is with performance number P simultaneously load-P pVoutput is to load;
The output signal of c2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
9. according to the described method of claim 7 or 8, it is characterized in that, the control procedure of steps d is as follows:
D1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize the electricity network no-output by the two-way DC/DC chopper of controlling the electricity network loop simultaneously;
The output signal of d2, single-phase DC/AC converter is exported to load successively after high frequency transformer isolation boosting and rectifier bridge rectification.
10. according to the described method of any one claim of claim 7 to 9, it is characterized in that, the control procedure of step e is as follows:
E1, employing SPWM control the maximum power point of single-phase DC/AC converter with tracking photovoltaic array, realize that by the two-way DC/DC chopper of controlling the electricity network loop rectification bridge output end is with performance number P simultaneously pV-P loadto the electricity network feed;
The output signal of e2, single-phase DC/AC converter is exported successively after high frequency transformer isolation boosting and rectifier bridge rectification, wherein performance number P pV-P loadsignal successively through two-way DC/DC chopper boost and single-phase AC/DC PWM rectifier inversion rear feed to electricity network.
CN201310475953.9A 2013-10-12 2013-10-12 Hybrid power supply system consisting of mains supply network and photovoltaic assembly and control method thereof Pending CN103501020A (en)

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CN103929087A (en) * 2014-04-01 2014-07-16 陕西科技大学 High-efficiency high-power-factor two-way AC/DC converter
CN104283302A (en) * 2014-09-30 2015-01-14 广东美的制冷设备有限公司 Air conditioner and power supply system of air conditioner
CN106374608A (en) * 2016-09-21 2017-02-01 成都启立辰智科技有限公司 Photovoltaic charging system for electric vehicle
CN111969876A (en) * 2020-08-25 2020-11-20 辽宁鑫知界科技有限公司 High-frequency inverter power supply networking control method and system

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