CN104578142A - Multi-way MPPT (Maximum Power Point Tracking) photovoltaic inversion control circuit system - Google Patents
Multi-way MPPT (Maximum Power Point Tracking) photovoltaic inversion control circuit system Download PDFInfo
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- CN104578142A CN104578142A CN201410737888.7A CN201410737888A CN104578142A CN 104578142 A CN104578142 A CN 104578142A CN 201410737888 A CN201410737888 A CN 201410737888A CN 104578142 A CN104578142 A CN 104578142A
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- H02J3/385—
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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
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- 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 relates to a multi-way MPPT (Maximum Power Point Tracking) photovoltaic inversion control circuit system which is technically characterized by being formed by connecting a main station control device and a plurality of slave station control devices, wherein the main station control device is formed by sequentially connecting a main station high-voltage acquisition board, a high-speed communication board, a main station control board and a main station motherboard; the slave station control devices comprise slave station high-voltage acquisition boards, slave station PWM (Pulse-width Modulation) boards, slave station motherboards, power supply boards and driving boards; the slave station high-voltage acquisition boards, the slave station PWM boards and the slave station motherboards are sequentially connected; and the power supply boards and the driving boards are connected with the slave station motherboards. The system employs a high-speed communication manner between the main station control device and the slave station control devices to achieve an inversion output carrier function, and reduces common mode voltage between inverters, the stability and reliability of the system are improved, and slave station PWM board cards are mutually independent and can be replaced mutually in the system, thereby facilitating maintenance.
Description
Technical field
The invention belongs to photovoltaic inversion technical field, especially a kind of multichannel MPPT photovoltaic inversion control loop system.
Background technology
Photovoltaic generating system is made up of panel array and power conversion (inverter) part usually, usually requires between inverter and electrical network, to place low-frequency transformer for electrical network and PV array electrical isolation.Non-isolated inverter is more and more subject to the attention of producer due to advantages such as efficiency are high, cost is low, volume is little, but PV array and electrical network will be made to have had electrical connection if remove transformer, common mode current can significantly increase, bring potential safety hazard, and also can exert an adverse impact to cell panel.At present, use many MPPT (Maximum Power PointTracking, MPPT maximum power point tracking) for improving the focus that inverter energy output is the research of each producer, therefore, eliminating the common mode current flowing through PV array under many MPPT structure and also having become grid-connected study hotspot.Document " Transformerless single-phase multilevel-based photovoltaicinverter " sets up common mode equivalent model for single-phase bridge-type three-level combining inverter, draw the constant conclusion of common-mode voltage, thus reduction common mode current, but this conclusion is in three-phase system and be false.Document " research of NPC three level combining inverter common mode current suppression technology " analyzes three-level photovoltaic inverter common mode characteristic, propose the indemnifying measure strengthening three-level photovoltaic inverter common mode rejection performance, but the method poor practicability, is difficult to use in engineering practice.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of stability strong, easy to maintenance and the multichannel MPPT photovoltaic inversion control loop system of systems generate electricity amount can be improved.
The present invention solves existing technical problem and takes following technical scheme to realize:
A kind of multichannel MPPT photovoltaic inversion control loop system, connected and composed by a main website control device and multiple slave station control device, described main website control device is by main website high-voltage acquisition plate, high speed communication plate, main website control board, main website motherboard connects and composes successively, described main website high-voltage acquisition plate is connected with inverter major loop collection three-phase power grid voltage, contactor electric current also sends to high speed communication plate, described high speed communication plate is connected with slave station control device and main website control board and by three-phase power grid voltage, contactor electric current sends to slave station control device and main website control board, main website motherboard gathers grid side alternating current and sends to main website control board, the PWM carrier signal of main website control board to slave station carries out high-speed synchronous, makes the PWM often organizing slave station generate carrier phase and is consistent, described slave station control device comprises slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard, power panel and drive plate composition, described slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard are connected successively, and described power panel is connected with slave station motherboard with drive plate, this slave station PWM plate is connected with high speed communication plate and carries out data transmission, this slave station high-voltage acquisition plate is connected with inverter major loop for gathering direct voltage and direct current, this power panel and inverter major loop are used for gathering direct voltage also for slave station motherboard is powered, this drive plate is connected with device for power switching for the action of driving power switching device.
And described main website control board comprises CPLD and ARM, this CPLD is responsible for start and stop logic, high speed communication process carry out high-speed synchronous to slave station PWM carrier signal, makes the PWM often organizing slave station generate carrier phase and is consistent; This ARM is responsible for man-machine interface, communication and data processing.
And; described slave station PWM plate comprises DSP and FPGA; this DSP is responsible for photovoltaic DC-to-AC converter related algorithm and calculates, and this FPGA is responsible for gathering alternating voltage, alternating current and direct voltage, direct current is for Systematical control and protection and carry out transfer of data with main website, realizes controlling pwm pulse given.
And described high speed communication plate adopts 100M optical fiber to be connected with main website control board and slave station control device.
And described main website control board also connects a touch-screen.
And, described from station control system be two, three, four, six or eight.
Advantage of the present invention and good effect are:
The present invention adopts high-speed communication means to realize inversion outgoing carrier function by main website control device and slave station control device, reduces the common-mode voltage between each group of inverter, improves stability and the reliability of system; Each power cell in native system and slave station PWM board separate, alternative mutually, maintain easily.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
The circuit block diagram of Tu2Shi main website control device;
Fig. 3 is the circuit block diagram of slave station control device;
Fig. 4 is the relation schematic diagram of the present invention and inverter major loop;
Fig. 5 is the circuit diagram of inverter major loop;
Fig. 6 is the common mode principle isoboles in inverter major loop.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described.
A kind of multichannel MPPT photovoltaic inversion control loop system, as shown in Figure 1, comprise a main website control device and multiple slave station control device, can be two, three, four, six or eight etc. from the quantity of station control system, the present embodiment be described from station control system for four.Main website control device is connected and composed successively by main website high-voltage acquisition plate, high speed communication plate, main website control board, main website motherboard, slave station control device comprises slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard, power panel and drive plate composition, slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard are connected successively, power panel is connected with slave station motherboard with drive plate, high speed communication between master station and follow station adopts 100M Fiber connection, to meet the real-time of system communication.The board of four slave station control device is just the same, can phase trans-substitution and separate, is conducive to reducing maintenance cost.
Below main website control device and slave station control device are described respectively:
As shown in Figure 2, main website high-voltage acquisition plate: be mainly used to the signal such as Sample AC voltage, contactor electric current, wherein X1 port input three-phase voltage on line side u
aBC, X5 terminal input contactor K1 current i
12with contactor K2 current i
34, the voltage and current signal of main website high-voltage acquisition plate collection is sent to high speed communication plate by X3 terminal.
Main website motherboard: the input of X3 terminal is through the grid side alternating current I of Hall current sensor sampling
aBC, and signal transacting is carried out on main website motherboard, send to main website control board by X9 terminal.
High speed communication plate: pass through 100M Fiber connection with the slave station PWM plate of slave station control device, realize the high-speed data communications between main website and slave station; 1,2 ports of X3 terminal are used for sending data to slave station PWM plate, adopt serial communication mode, send data and comprise alternating voltage, carrier synchronization signal, start and stop logical signal etc.; 3,4 ports of X3 terminal are used for receiving the data of slave station PWM plate, comprise fault-signal, logic control signal etc.
Main website control board: main control chip is made up of CPLD and ARM, CPLD is responsible for the aspects such as start and stop logic, high speed communication, carries out high-speed synchronous to the PWM carrier signal of slave station simultaneously, makes the PWM often organizing slave station generate carrier phase and is consistent; The man-machine interface of ARM primary responsibility, upper machine communication and correlation computations.The external scram button of port 5 of X5 terminal, in order to emergency cutoff.The port 6 of X5 terminal connects insulation failure detection, with check system insulation situation.
As shown in Figure 3, slave station control device slave station high-voltage acquisition plate, slave station motherboard, power panel, drive plate and slave station PWM plate composition.
Slave station high-voltage acquisition plate is mainly used to direct current of sampling, and judges earth fault.X5 terminal input direct-current electric current i
dc; The electromotive force of DC side both positive and negative polarity relative to the earth PE compares, to have judged whether earth fault by X2 port; The DC current signal of slave station high-voltage acquisition plate collection and earth-fault signal are sent to PWM plate by X3 terminal.
Slave station motherboard: the input of X3 terminal is through the grid side alternating current I of Hall current sensor sampling
aBC, and signal transacting is carried out on slave station motherboard; X4 terminal input heat-sink temperature signal; X9 terminal is connected with slave station PWM plate, sends current signal and heat-sink temperature signal to slave station PWM plate, and receives the pwm pulse signal of slave station PWM transmission; X5 terminal is connected with the X1 terminal of drive plate, in order to pwm pulse signal is sent to drive plate.
Drive plate: drive plate is used for the action of driving power switching device, the 2SP0115T2Ax selecting CONCEPT company to produce series driver module.
Power panel: power panel is mainly used to gather direct voltage and be responsible for powering to motherboard.
Slave station PWM plate: main control chip is made up of DSP and FPGA; wherein DSP is responsible for photovoltaic DC-to-AC converter related algorithm; FPGA is responsible for gathering alternating voltage, alternating current and direct voltage, direct current for Systematical control and protection; carry out transfer of data by high speed fibre communication module and main website, and it is given to control pwm pulse simultaneously.
The present invention and inverter major loop link together and can form multichannel MPPT photovoltaic inverting system, and in the present embodiment, the inversion unit in inverter major loop also adopts four.The formation of this system as shown in Figure 4.Electric current (idc, i1 that inverter major loop produces
aBC~ i4
aBC) signal, voltage (udc, u
aBC) signal is sampled in this kind of multichannel MPPT photovoltaic inversion control loop system, through calculation process, produce the switching signal of pwm pulse Setting signal and contactor K1, K2, then remove control inverter major loop.
As shown in Figure 5, inverter major loop comprises four independently photovoltaic inversion unit, four photovoltaic modulies PV1, PV2, PV3, PV4 are connected in four photovoltaic inversion unit respectively by photovoltaic inversion unit D.C. contactor, EMI filter circuit, and four photovoltaic inversion unit are connected on three phase network through LCL filter circuit respectively.Between the 1st photovoltaic inversion unit and the 2nd photovoltaic inversion unit, be connected with the first contactor K1, between the 3rd photovoltaic inversion unit and the 4th photovoltaic inversion unit, be connected with the second contactor K2.Each photovoltaic inversion unit collection interchange inlet wire current i1 separately
aBC~ i4
aBCas system protection and dead time compensate use, gather respective direct voltage u
dc, direct current i
dcfollow the tracks of as MPPT and use, line voltage u
aBCby the control board collection of inverter control loop main website and by high speed communication plate for each slave station PWM plate jointly.
In inverter control loop, as direct voltage u
dcafter meeting entry condition, first closed photovoltaic inversion unit D.C. contactor, and contactor K1, K2 are closure states when every subsystem startup, make photovoltaic module PV1, PV2 and photovoltaic module PV3, PV4 in parallel respectively by contactor K1, K2, then enable 1st photovoltaic inversion unit and the 3rd photovoltaic inversion unit are generated electricity by way of merging two or more grid systems, and make photovoltaic module PV1, PV2 merge into one group for the 1st photovoltaic inversion unit work; Photovoltaic module PV3, PV4 merge into one group for the 3rd photovoltaic inversion unit work; This mode of operation is equivalent to add cell panel capacity, grid-connected time advance in morning can be made, make evening from netting time lag, add photovoltaic module service time, system gross generation is increased, and under cloudy cloudy weather, adopt this mode of operation, only has the 1st photovoltaic inversion unit and the 3rd photovoltaic inversion unit work, because the 2nd photovoltaic inversion unit and the 4th photovoltaic inversion unit do not work, therefore eliminate the loss of LCL filter inside the 2nd photovoltaic inversion unit and the 4th photovoltaic inversion unit, improve systems generate electricity efficiency.
When contactor K1 being detected, after the power that K2 flows through is greater than certain value, start the 2nd, 4th photovoltaic inversion unit is generated electricity by way of merging two or more grid systems, because contactor K1 and the 2nd photovoltaic inversion unit power output sum equal the 2nd output power of photovoltaic module, contactor K2 and the 4th photovoltaic inversion unit power output sum equal the 4th output power of photovoltaic module, therefore along with the 2nd, power output is increased gradually after 4th photovoltaic inversion unit is grid-connected, K1, the electric current that K2 flows through can decline gradually, until K1, K1 is disconnected after electric current reduces to zero on K2 contactor, K2 contactor, time now owing to disconnecting, electric current is almost nil, therefore phenomenon of arc discharge can not be produced, K1, K2 often organizes photovoltaic inversion unit by respective MPPT independent operating after disconnecting.
Because photovoltaic panel energy during contactor K1, K2 Operating In Persistent Current Mode is relatively not high, the maximum current flowing through contactor K1, K2 is less than rated value, so the contactor capacity selected can be less than rated power herein.
On the basis using LCL filter circuit, ac filter circuit electric capacity mid point is led back DC capacitor mid point, and by the DC capacitor mid point short circuit of each inverter, each group of inverter direct-flow side midpoint potential is consistent.Wherein DC capacitor mid point short circuit can be described by the principle of equal effects shown in Fig. 4:
Shown in Fig. 6, the common-mode voltage produced by 4 groups of photovoltaic inversion unit IGBT module can be equivalent to Ucm1 ~ Ucm4.For Ucm1, the common mode current path that it produces has 2, and 1 is through L1->C1, and 1 is L1->L2->PCC common point-> the earth->Cpv1.First, utilize high speed communication synchronous the triangular carrier of 4 groups of photovoltaic inversion unit, phase lock voltage due to 4 groups of photovoltaic inversion unit is derived from same line voltage, so their output voltage is given also relatively, therefore with through synchronous triangular carrier generation pwm pulse is compared, their switching time also can be relatively close, so produce common-mode voltage also closer to, between such Ucm1 ~ Ucm4, most of common-mode voltage can be cancelled out each other; Compare triangular carrier asynchronous modulation method, considerably reduce the common-mode voltage between each photovoltaic inversion unit.Then, each DC capacitor mid point wire R short circuit, so two groups of inverter DC capacitor mid-point voltages are by wire clamper, make the common-mode voltage between PV array almost nil, thus further reduce the common mode current on PV array.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other execution modes drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (6)
1. a multichannel MPPT photovoltaic inversion control loop system, it is characterized in that: connected and composed by a main website control device and multiple slave station control device, described main website control device is by main website high-voltage acquisition plate, high speed communication plate, main website control board, main website motherboard connects and composes successively, described main website high-voltage acquisition plate is connected with inverter major loop collection three-phase power grid voltage, contactor electric current also sends to high speed communication plate, described high speed communication plate is connected with slave station control device and main website control board and by three-phase power grid voltage, contactor electric current sends to slave station control device and main website control board, main website motherboard gathers grid side alternating current and sends to main website control board, the PWM carrier signal of main website control board to slave station carries out high-speed synchronous, makes the PWM often organizing slave station generate carrier phase and is consistent, described slave station control device comprises slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard, power panel and drive plate composition, described slave station high-voltage acquisition plate, slave station PWM plate, slave station motherboard are connected successively, and described power panel is connected with slave station motherboard with drive plate, this slave station PWM plate is connected with high speed communication plate and carries out data transmission, this slave station high-voltage acquisition plate is connected with inverter major loop for gathering direct voltage and direct current, this power panel and inverter major loop are used for gathering direct voltage also for slave station motherboard is powered, this drive plate is connected with device for power switching for the action of driving power switching device.
2. a kind of multichannel MPPT photovoltaic inversion control loop system according to claim 1, it is characterized in that: described main website control board comprises CPLD and ARM, this CPLD is responsible for start and stop logic, high speed communication process carry out high-speed synchronous to slave station PWM carrier signal, makes the PWM often organizing slave station generate carrier phase and is consistent; This ARM is responsible for man-machine interface, communication and data processing.
3. a kind of multichannel MPPT photovoltaic inversion control loop system according to claim 1; it is characterized in that: described slave station PWM plate comprises DSP and FPGA; this DSP is responsible for photovoltaic DC-to-AC converter related algorithm and calculates; this FPGA is responsible for gathering alternating voltage, alternating current, direct voltage and direct current and carries out transfer of data for Systematical control and protection with main website, realizes controlling pwm pulse given.
4. a kind of multichannel MPPT photovoltaic inversion control loop system according to any one of claims 1 to 3, is characterized in that: described high speed communication plate adopts 100M optical fiber to be connected with main website control board and slave station control device.
5. a kind of multichannel MPPT photovoltaic inversion control loop system according to any one of claims 1 to 3, is characterized in that: described main website control board also connects a touch-screen.
6. a kind of multichannel MPPT photovoltaic inversion control loop system according to any one of claims 1 to 3, is characterized in that: described from station control system be two, three, four, six or eight.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003299252A (en) * | 2002-03-29 | 2003-10-17 | Mitsubishi Heavy Ind Ltd | Parallel operation control method for photovoltaic power generating system |
| CN103368182A (en) * | 2013-08-08 | 2013-10-23 | 东南大学 | Modularized multi-machine parallel-connection large-power APF (active power filter) control system and realization method |
| CN103986182A (en) * | 2014-01-21 | 2014-08-13 | 云南师范大学 | Photovoltaic grid connected system based on power line carrier communication |
| CN204316099U (en) * | 2014-12-05 | 2015-05-06 | 天津电气科学研究院有限公司 | Multichannel MPPT photovoltaic inversion control loop system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003299252A (en) * | 2002-03-29 | 2003-10-17 | Mitsubishi Heavy Ind Ltd | Parallel operation control method for photovoltaic power generating system |
| CN103368182A (en) * | 2013-08-08 | 2013-10-23 | 东南大学 | Modularized multi-machine parallel-connection large-power APF (active power filter) control system and realization method |
| CN103986182A (en) * | 2014-01-21 | 2014-08-13 | 云南师范大学 | Photovoltaic grid connected system based on power line carrier communication |
| CN204316099U (en) * | 2014-12-05 | 2015-05-06 | 天津电气科学研究院有限公司 | Multichannel MPPT photovoltaic inversion control loop system |
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