CN109546684B - Micro-grid power supply system - Google Patents

Micro-grid power supply system Download PDF

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Publication number
CN109546684B
CN109546684B CN201811546934.XA CN201811546934A CN109546684B CN 109546684 B CN109546684 B CN 109546684B CN 201811546934 A CN201811546934 A CN 201811546934A CN 109546684 B CN109546684 B CN 109546684B
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switch
module
port
voltage
micro
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CN109546684A (en
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鲍明
马英
谭钧升
谭清远
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Liaoning Hengshun New Energy Technology Co ltd
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Liaoning Hengshun New Energy Technology Co ltd
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    • H02J3/383—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/386—
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

A micro-grid power supply system belongs to the technical field of power supply systems, and particularly relates to a micro-grid power supply system. The invention provides a reliable micro-grid power supply system. The photovoltaic power generation system comprises a main switch, a step-up transformer, a first switch, a photovoltaic inverter, a photovoltaic module, a second switch, a fan inverter, a wind driven generator, a third switch, an energy storage inverter, an energy storage battery, a fourth switch and an active power filter, wherein one end of the main switch is connected with a secondary bus, the other end of the main switch is connected with the output end of the step-up transformer, the input end of the step-up transformer is respectively connected with one end of the first switch, one end of the second switch, one end of the third switch and one end of the fourth switch, one end of the first switch is connected with the output end of the photovoltaic inverter, and the input end of the photovoltaic inverter is connected with the output end of the photovoltaic module.

Description

Micro-grid power supply system
Technical Field
The invention belongs to the technical field of power supply systems, and particularly relates to a micro-grid power supply system.
Background
With the rapid development of new energy automobiles, people pay more attention to the charging technology of new energy automobiles, so that it is necessary to develop a safe and reliable charging device, and the safe and reliable charging device needs a reliable micro-grid power supply system.
Disclosure of Invention
The invention aims at the problems and provides a reliable micro-grid power supply system.
In order to achieve the purpose, the invention adopts the following technical scheme that the device comprises a main switch, a step-up transformer, a first switch, a photovoltaic inverter, a photovoltaic module, a second switch, a fan inverter, a wind driven generator, a third switch, an energy storage inverter, an energy storage battery, a fourth switch and an active power filter, wherein one end of the main switch is connected with a secondary bus, the other end of the main switch is connected with the output end of the step-up transformer, the input end of the step-up transformer is respectively connected with one end of the first switch, one end of the second switch, one end of the third switch and one end of the fourth switch, one end of the first switch is connected with the output end of the photovoltaic inverter, and the input end of the photovoltaic inverter is connected with the output end of the photovoltaic module;
the other end of one end of the second switch is connected with the output end of the fan inverter, and the input end of the fan inverter is connected with the output end of the wind driven generator;
the other end of one end of the third switch is connected with the output end of the energy storage inverter, and the input end of the energy storage inverter is connected with the energy storage battery;
the other end of the fourth switch Guan Yiduan is connected with an active power filter.
As a preferable scheme, the invention further comprises a micro-grid controller, wherein the signal transmission port of the micro-grid controller is respectively connected with the signal transmission port of the photovoltaic inverter, the signal transmission port of the active power filter, the signal transmission port of the energy storage inverter, the signal transmission port of the fan inverter and the signal transmission port of the micro-grid energy power system.
As another preferable scheme, the micro-grid energy power system adopts a computer.
As another preferable scheme, the micro-grid controller comprises an MCU and a DSP, wherein a signal transmission port of the MCU is connected with a signal transmission port of the DSP, a control signal output port of the MCU is connected with an input port of a first IPM module, an output port of the first IPM module is connected with a control port of a DC/DC module, an input port of the DC/DC module is connected with a photovoltaic module, and an output port of the DC/DC module is connected with an input port of the first AC/DC module;
the control signal input port of the first AC/DC module is connected with the output port of the second IPM module, the input port of the second IPM module is connected with the DSP control signal output port, the DSP control signal output port is connected with the control signal input port of the bidirectional AC/DC module, the bidirectional AC/DC module is respectively connected with the storage battery pack, the output port of the first AC/DC module and one end of the first contactor, and the signal input port of the DSP is connected with the signal output port of the photovoltaic power generation and wind power generation load state sampling module;
the control signal input port of the first contactor is connected with the control signal output port of the DSP through the relay, the other end of the first contactor is respectively connected with an alternating current load and the input end of the second AC/DC module, the output end of the second AC/DC module is connected with a direct current load, the alternating current load is connected with the wind driven generator through the second contactor, and the control signal input port of the second contactor is connected with the control signal output port of the DSP through the relay.
As another preferable scheme, the micro-grid energy power system comprises a data layer, a management layer and a scheduling layer, wherein the data layer dynamically collects the change of the generated power and the load real-time power of each power generation unit in real time, the collected data is sent to the management layer for data analysis and optimization, and then the scheduling layer is used for distributing each unit.
Secondly, the data layer comprises an information acquisition part, a data management part, a state prediction part, an energy rate prediction part and a network topology analysis part; the management layer comprises a load switching part, a system management part, an energy storage management part, a tide calculation part, a reactive power optimization part and an economic optimization part; the dispatching layer comprises a generator set dispatching part, an energy storage charge and discharge management part and a load management and dispatching part.
In addition, the invention also comprises a micro-grid battery management system, wherein the micro-grid battery management system comprises a host module, a slave module, a protection board module and a display module;
the slave module and the host module measure the voltage and the temperature of the battery and balance the energy of the battery; the protection board module performs SOC calculation, SOH calculation and generates alarm data; the host module controls charging and discharging of the protection board, counts battery pack information, detects system state and controls the system state; the display module displays the data of the battery, gives out audible and visual alarm and records the data.
The invention has the beneficial effects that.
The invention can provide stable and reliable electric energy for subsequent equipment through mutual matching of the parts.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
Fig. 1 is a system block diagram of a centralized high-voltage rectifying current distribution charging stack of the present invention.
Fig. 2 is a block diagram of the high voltage protection system of the present invention.
Fig. 3 is a block diagram of a rectifier transformer of the present invention.
Fig. 4 is a block diagram of a high voltage rectifying system of the present invention.
Fig. 5 is a diagram of a commutating overvoltage absorbing fast melting fuse circuit of the present invention.
Fig. 6 is a diagram of a PLC CPU control unit of the present invention.
Fig. 7 is a diagram of a touch screen, ethernet module unit of the present invention.
Fig. 8 is a diagram of a dc-dc voltage sampling unit according to the present invention.
Fig. 9 is a diagram of an operating overvoltage absorbing unit according to the present invention.
Fig. 10 is a PLC unit diagram of the present invention.
Fig. 11 is a diagram of a bridge arm overheat alarm, bridge arm overheat trip unit of the present invention.
Fig. 12 is a diagram of a fast melt fuse alarm and trip unit of the present invention.
FIG. 13 is a block diagram of a meter isolator system according to the present invention.
Fig. 14 is a diagram of a power supply unit of the high-voltage rectifying pile control system of the present invention.
Fig. 15 is a block diagram of a control system for a charging pile according to the present invention.
Fig. 16 is a schematic block diagram of a charging pile control system according to the present invention.
Fig. 17 is a flowchart of a charging pile control system according to the present invention.
FIG. 18 is a schematic diagram of a half-bridge dual-channel interleaved parallel charging chopper circuit unit for an intelligent charging pile according to the present invention.
Fig. 19 is a circuit diagram of a regulating loop of the intelligent charging pile dynamic distribution system according to the present invention.
Fig. 20 is a block diagram of a high voltage rectifier transformer (diode) system of the present invention.
Fig. 21 is a block diagram of a high voltage rectifier transformer (thyristor) system of the invention.
Fig. 22 is a block diagram of a 12-pulse rectification system according to the present invention.
Fig. 23 is a block diagram of a micro-grid power supply system of the present invention.
Fig. 24 is a microgrid controller of the present invention.
Fig. 25 is a microgrid energy power system of the present invention.
Fig. 26 is a micro-grid battery management system of the present invention.
Fig. 27 is a schematic diagram of a voltage regulating switch according to the present invention.
Detailed Description
As shown in the figure, the invention can be applied to a centralized high-voltage rectifying current distribution charging pile, wherein the centralized high-voltage rectifying current distribution charging pile comprises a high-voltage protection unit, a high-voltage rectifying transformer unit, a high-voltage rectifying unit and a charging pile group current distribution unit, an output port of the high-voltage protection unit is connected with an input port of the high-voltage rectifying transformer unit, an output port of the high-voltage rectifying transformer unit is connected with an input port of the high-voltage rectifying unit, and an output port of the high-voltage rectifying unit is connected with an input port of the charging pile group current distribution unit.
The centralized high-voltage rectifying current distribution charging pile is mutually matched through the units, so that the safety and reliability of the charging pile can be improved, and the distribution of charging current is facilitated.
The output port of the high-voltage rectifier transformer unit outputs 12 pulse waves 840V/1500A pulse voltage.
And the output port of the high-voltage rectifying unit outputs 750V/1500A medium-voltage direct current.
The charging pile group current distribution unit comprises a plurality of charging piles, each charging pile is connected in parallel, and the electric energy input end of each charging pile is connected with the output port of the high-voltage rectifying unit.
And an output port of the high-voltage rectifying unit is connected with an electric energy input end of the charging pile through the closed busbar.
The high-voltage protection unit comprises a wire inlet cabinet, a metering cabinet, a PT cabinet, a transformer and a wire outlet cabinet, wherein the output end of the wire inlet cabinet and the input end of the metering cabinet are connected with a primary bus, the output end of the metering cabinet is connected with the input end of the PT cabinet, the output end of the PT cabinet is connected with a secondary bus, the secondary bus is respectively connected with the input end of the transformer and the input end of the wire outlet cabinet, and the output end of the wire outlet cabinet is connected with the input end of the high-voltage rectification transformer unit. The transformer can supply power for the control power supply of all devices and the lighting and communication devices of the whole charging field.
The invention further comprises that the electric energy output end of the micro-grid power supply system is connected with the secondary bus.
Under the condition of insufficient load of a local power grid, a 500KW micro-grid system matched with the system can be selected for load supplement.
And the secondary side of the rectifier transformer of the high-voltage rectifier transformer unit adopts a star-delta output parallel structure. The secondary windings of the rectifier transformer of the high-voltage rectifier transformer unit are respectively connected into a T1 high-voltage rectifier bridge and a T2 high-voltage rectifier bridge, so that the two groups of direct current outputs are connected in parallel and then output.
The turns ratio of the primary winding and the secondary winding of the rectifier transformer is 1:1:3, wherein the star-shaped structure of the secondary winding is 1, and the triangular connection structure is 3.
The iron core of the rectifier transformer adopts a silicon steel sheet 30Q130 and adopts a 45-degree full-oblique-seam weft-free glass ribbon binding structure. The modulation magnetic density of the structure is less than 1.58T, so that the iron core is ensured to be over-excited when the voltage fluctuation of the power grid is +5%; the voltage regulating range still outputs rated voltage when the voltage fluctuation of the power grid is considered to be-5%; the density of the whole transformation is less than 1.65T.
The micro-grid power supply system comprises a main switch, a step-up transformer, a first switch, a photovoltaic inverter, a photovoltaic module, a second switch, a fan inverter, a wind driven generator, a third switch, an energy storage inverter, an energy storage battery, a fourth switch and an active power filter, wherein one end of the main switch is connected with a secondary bus, the other end of the main switch is connected with the output end of the step-up transformer, the input end of the step-up transformer is respectively connected with one end of the first switch, one end of the second switch, one end of the third switch and one end of the fourth switch, one end of the first switch is connected with the output end of the photovoltaic inverter, and the input end of the photovoltaic inverter is connected with the output end of the photovoltaic module;
the other end of one end of the second switch is connected with the output end of the fan inverter, and the input end of the fan inverter is connected with the output end of the wind driven generator;
the other end of one end of the third switch is connected with the output end of the energy storage inverter, and the input end of the energy storage inverter is connected with the energy storage battery;
the other end of the fourth switch Guan Yiduan is connected with an active power filter.
The high-voltage rectifier transformer unit comprises a high-voltage side winding, a low-voltage side star-shaped parallel winding and a low-voltage side triangle-shaped parallel winding.
The high-voltage rectifying transformer unit further comprises a voltage sensor for detecting low-voltage side voltage, a signal output port of the voltage sensor is connected with a detection signal input port of the controller, and a control signal output port of the controller is connected with a control signal input port of a voltage regulating switch for regulating the number of turns of the high-voltage side winding.
The invention adopts the 7-section voltage regulating switch, the alternating current energy of the power grid enters the voltage regulating switch after passing through the high-voltage switch, and the voltage regulating switch can be operated in a load way through the tapping switch. The gear display signal of the voltage regulating switch is transmitted to the control cabinet of the rectifying system and can receive the on-load boosting, on-load reducing and on-load emergency stopping operation signals of the control cabinet. The primary side of the transformer is tapped to regulate the voltage, so that the secondary side is ensured to output a stable voltage value. When the system detects that the direct-current primary voltage is lower than the rated voltage by 10%, the control system adjusts the voltage regulating switch, and the purpose of improving the output voltage of the secondary winding is achieved by reducing the number of turns of the primary winding.
And when the controller detects that the low-voltage side voltage is lower than the rated voltage by 10%, the controller controls the voltage regulating switch to reduce the number of turns of the high-voltage side winding.
The high-voltage side winding comprises a U-phase winding, a V-phase winding and a W-phase winding, the voltage regulating switch group comprises a U-phase first voltage regulating switch, a U-phase second voltage regulating switch, a V-phase first voltage regulating switch, a V-phase second voltage regulating switch, a W-phase first voltage regulating switch and a W-phase second voltage regulating switch,
the U-phase winding center tap is a U-phase input end and is respectively connected with the first wiring end of the W-phase first voltage regulating switch and the first wiring end of the W-phase second voltage regulating switch;
The center tap of the V-phase winding is a V-phase input end and is respectively connected with the first wiring end of the U-phase first voltage regulating switch and the first wiring end of the U-phase second voltage regulating switch;
the W-phase winding center tap is a W-phase input end and is respectively connected with the first wiring end of the V-phase first voltage regulating switch and the first wiring end of the V-phase second voltage regulating switch;
the second wiring of the U-phase first voltage regulating switch is connected with one end of the U-phase winding, and the other end of the U-phase winding is connected with the second wiring of the U-phase second voltage regulating switch;
the second wiring of the V-phase first voltage regulating switch is connected with one end of a V-phase winding, and the other end of the V-phase winding is connected with the second wiring of the V-phase second voltage regulating switch;
the second wiring of the W-phase first voltage regulating switch is connected with one end of the W-phase winding, and the other end of the W-phase winding is connected with the second wiring of the W-phase second voltage regulating switch.
The low-voltage side star-shaped parallel winding comprises a 2a winding, a 2b winding and a 2c winding, the low-voltage side triangle-shaped parallel winding comprises a 3a winding, a 3b winding and a 3c winding, one end of the 2a winding, one end of the 2b winding and one end of the 2c winding are connected, and the other end of the 2a winding, the other end of the 2b winding and the other end of the 2c winding are electric energy output ends;
one end of the 3a winding is an electric energy output end and is connected with one end of the 3c winding, the other end of the 3c winding is an electric energy output end and is connected with one end of the 3b winding, and the other end of the 3b winding is an electric energy output end and is connected with the other end of the 3a winding.
The high-voltage rectifying unit adopts a T1 high-voltage rectifying bridge (1) and a T2 high-voltage rectifying bridge (2), and the input ends of the T1 high-voltage rectifying bridge (1) and the T2 high-voltage rectifying bridge (2) are connected with the output end of the high-voltage rectifying transformer unit;
or a pulse wave rectifying circuit is adopted, and the input end of the pulse wave rectifying circuit is connected with the output end of the high-voltage rectifying transformer unit.
The pulse wave rectifying circuit comprises diodes V7-V12, diodes V1-V6, wherein the anode of the diode V7 is respectively connected with the electric energy output end of the 2a winding and the cathode of the diode V8, and the cathode of the diode V7 is respectively connected with the cathode of the diode V9, the cathode of the diode V12, the output anode of the pulse wave rectifying circuit, the cathode of the diode V1, the cathode of the diode V3 and the cathode of the diode V5;
the anode of the diode V8 is respectively connected with the anode of the diode V10, the anode of the diode V11, the anode of the diode V2, the anode of the diode V4, the anode of the diode V6 and the output cathode of the pulse wave rectifying circuit;
the cathode of the diode V10 is respectively connected with the electric energy output end of the 2b winding and the anode of the diode V9, and the cathode of the diode V11 is respectively connected with the electric energy output end of the 2c winding and the anode of the diode V12;
the anode of the diode V1 is respectively connected with the electric energy output end of the 3a winding and the cathode of the diode V2, the anode of the diode V3 is respectively connected with the electric energy output end of the 3b winding and the cathode of the diode V4, and the anode of the diode V5 is respectively connected with the electric energy output end of the 3c winding and the cathode of the diode V6.
In the pulse wave rectifying circuit shown in fig. 22, two three-phase full-control bridge rectifying circuits are connected in parallel with each other with a phase shift of 30 ° to form a pulse wave rectifying circuit, so that the phases of two groups of three-phase alternating current power supplies are staggered by 30 °, and the output rectifying voltage is pulsed 12 times in one power supply period. T1 and T2 are two groups of rectifier bridges connected in parallel.
The T1 high-voltage rectifier bridge (1) and the T2 high-voltage rectifier bridge (2), wherein the T1 high-voltage rectifier bridge (1) comprises a L, K, J, I, H, G arm, and the T2 high-voltage rectifier bridge (2) comprises a F, E, D, C, B, A arm; one end of the L, K arm is connected with the electric energy output end of the 2a winding, the other end of the L arm is connected with the negative electrode of the output end, and the other end of the K arm is connected with the positive electrode of the output end;
J. one end of the I arm is connected with the electric energy output end of the 2b winding, the other end of the J arm is connected with the negative electrode of the output end, and the other end of the I arm is connected with the positive electrode of the output end;
H. one end of the G arm is connected with the electric energy output end of the 2c winding, the other end of the H arm is connected with the negative electrode of the output end, and the other end of the G arm is connected with the positive electrode of the output end;
F. one end of the E arm is connected with the electric energy output end of the 3a winding, the other end of the F arm is connected with the negative electrode of the output end, and the other end of the E arm is connected with the positive electrode of the output end;
D. one end of the C arm is connected with the electric energy output end of the 3b winding, the other end of the D arm is connected with the negative electrode of the output end, and the other end of the C arm is connected with the positive electrode of the output end;
B. one end of the arm A is connected with the electric energy output end of the 3c winding, the other end of the arm B is connected with the negative electrode of the output end, and the other end of the arm A is connected with the positive electrode of the output end.
The L arm is formed by connecting diodes V12-1-2 and fuses FU 12-1-2 in series;
the K arm is formed by connecting diodes V11-1-2 and fuses FU 11-1-2 in series;
the J arm is formed by connecting diodes V10-1-2 and fuses FU 10-1-2 in series;
the I arm is formed by connecting diodes V9-1-2 and fuses FU 19-1-2 in series;
the H arm is formed by connecting diodes V8-1-2 and fuses FU 8-1-2 in series;
the G arm is formed by connecting diodes V7-1-2 and fuses FU 7-1-2 in series;
the F arm is formed by connecting diodes V6-1-2 and fuses FU 6-1-2 in series;
the E arm is formed by connecting diodes V5-1-2 and fuses FU 5-1-2 in series;
the D arm is formed by connecting diodes V4-1-2 and fuses FU 4-1-2 in series;
the C arm is formed by connecting diodes V3-1-2 and fuses FU 13-1-2 in series;
the B arm is formed by connecting diodes V2-1-2 and fuses FU 2-1-2 in series;
the A arm is formed by connecting diodes V11-1-2 and fuses FU 1-2 in series.
The high-voltage rectifying unit further comprises a reversing overvoltage absorbing fusing circuit, and the reversing overvoltage absorbing fusing circuit is connected with the arm of the high-voltage rectifying bridge.
The commutation overvoltage absorbing fusing circuit connected with the K arm comprises a resistor R11, one end of the resistor R11 is respectively connected with the K arm, the anode of a diode V11-3, the anode of a diode V11-2 and the anode of a diode V11-1, the other end of the resistor R11 is connected with the L+ end through a capacitor C11 and a fuse FU21 in sequence, and the signal output end of the fuse FU21 is connected with the detection signal input port of the PLC CPU control unit;
The cathode of the diode V11-3 is connected with the L+ end through the fuse FU11-3, the cathode of the diode V11-2 is connected with the L+ end through the fuse FU11-2, and the cathode of the diode V11-31 is connected with the L+ end through the fuse FU 11-1;
the signal output end of the fuse FU11-3 is respectively connected with one end of a resistor R81-3 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R81-3 is connected with the detection signal input port of the fast-melting alarm tripping unit;
the signal output end of the fuse FU11-2 is respectively connected with one end of a resistor R81-2 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R81-2 is connected with the detection signal input port of the fast-melting alarm tripping unit;
the signal output end of the fuse FU11-1 is respectively connected with one end of a resistor R81-1 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R81-1 is connected with the detection signal input port of the fast-melting alarm tripping unit.
The commutation overvoltage absorbing fusing circuit connected with the arm A comprises a resistor R1, one end of the resistor R1 is respectively connected with the arm A, the anode of a diode V1-3, the anode of a diode V1-2 and the anode of a diode V1-1, the other end of the resistor R1 is connected with the end L+ through a capacitor C1 and a fuse FU21 in sequence, and the signal output end of the fuse FU21 is connected with the detection signal input port of the PLC CPU control unit;
The cathode of the diode V1-3 is connected with the L+ end through the fuse FU1-3, the cathode of the diode V1-2 is connected with the L+ end through the fuse FU1-2, and the cathode of the diode V1-31 is connected with the L+ end through the fuse FU 1-1;
the signal output end of the fuse FU1-3 is respectively connected with one end of a resistor R71-3 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R71-3 is connected with the detection signal input port of the fast-melting alarm tripping unit;
the signal output end of the fuse FU1-2 is respectively connected with one end of a resistor R71-2 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R71-2 is connected with the detection signal input port of the fast-melting alarm tripping unit;
the signal output end of the fuse FU1-1 is respectively connected with one end of the resistor R71-1 and the detection signal input port of the fast-melting alarm tripping unit, and one end of the resistor R71-1 is connected with the detection signal input port of the fast-melting alarm tripping unit.
The PLC CPU control unit includes CPU226 A1, terminals 0 and 1.4 of a CPU226 A1 terminating the signal output terminal of fuse FU 21.
The high-voltage rectification unit further comprises a touch screen Ethernet module unit.
The high-voltage rectifying unit further comprises an operation overvoltage absorbing unit, the operation overvoltage absorbing unit comprises piezoresistors RV 1-6, the piezoresistor RV1 is connected with a 2a winding electric energy output end through a fuse FU41, the piezoresistor RV2 is connected with a 2b winding electric energy output end through a fuse FU42, the piezoresistor RV3 is connected with a 2c winding electric energy output end through a fuse FU43, and signal output ends of the fuses 41-43 are respectively connected with a detection signal input port of a fast melting fusing alarm tripping unit, a detection signal input port of a bridge arm overheat alarm bridge arm overheat tripping unit and a detection signal input port of a PLC CPU control unit;
The voltage dependent resistor RV4 is connected with the electric energy output end of the 3a winding through the fuse FU44, the voltage dependent resistor RV5 is connected with the electric energy output end of the 3b winding through the fuse FU45, the voltage dependent resistor RV6 is connected with the electric energy output end of the 3c winding through the fuse FU46, and the signal output ends of the fuses 44-46 are respectively connected with the detection signal input port of the fast-melting alarm tripping unit, the detection signal input port of the bridge arm overheat alarm bridge arm overheat tripping unit and the detection signal input port of the PLC CPU control unit.
The high-voltage rectifying unit further comprises a direct-current overvoltage absorbing unit, the direct-current overvoltage absorbing unit comprises resistors R31 and R32 and a direct-current voltage sampling module which are connected in parallel, one end of a parallel circuit of the resistors R31 and R32 is connected with one end of a fuse FU53 respectively, the other end of the fuse FU53 is connected with one end of a piezoresistor RV13 and one end of a parallel circuit of the resistors R91 and R92 respectively, the other end of the parallel circuit of the resistors R91 and R92 is connected with one end of a parallel circuit of capacitors C41-45, the other end of the parallel circuit of the capacitors C41-45 is connected with the other end of the piezoresistor RV13 and one end of a fuse FU54 respectively, and the other end of the fuse FU54 is connected with the other end of the parallel circuit of the resistors R31 and R32 and the other end of the L-end respectively; the signal output ports of the fuses FU53 and FU54 are respectively connected with the detection signal input port of the fast fusing alarm tripping unit, the detection signal input port of the bridge arm overheat alarm bridge arm overheat tripping unit and the detection signal input port of the PLC CPU control unit;
The high-voltage rectifying unit further comprises a direct-current voltage sampling unit, the direct-current voltage sampling unit comprises a direct-current voltage sampling module, a detection input first port of the direct-current voltage sampling module is connected with the L+ end and the L-end through fuses FU55 and FU56, a detection input second port of the direct-current voltage sampling module is connected with the L2+ end and the L2-end, and a detection signal output port of the direct-current voltage sampling module is connected with a detection signal input port of the PLC unit.
The PLC unit employs an EM231 A3, A3 A+ and A-pin are connected with the detecting signal output port of the DC voltage sampling module.
The bridge arm overheat alarm bridge arm overheat tripping unit comprises 19 pins QBJ 04P 2 and P2 which are respectively connected with L arm, J arm, H arm, F arm, D arm, B arm, one end of a switch L105, one end of a switch J105, one end of a switch H105, one end of a switch F105, one end of a switch D105 and one end of a switch B105, and the other end of the switch L105, the other end of the switch J105, the other end of the switch H105, the other end of the switch F105, the other end of the switch D105 and the other end of the switch B105 are respectively correspondingly connected with 18-13 pins P2;
pins 1 to 6 of P2 are respectively and correspondingly connected with one end of a switch A105, one end of a switch C105, one end of a switch E105, one end of a switch G105, one end of a switch I105 and one end of a switch K105, and the other end of the switch A105, the other end of the switch C105, the other end of the switch E105, the other end of the switch G105, the other end of the switch I105 and the other end of the switch K105 are respectively and correspondingly connected with a A, C, E, G, I, K arm, and a A, C, E, G, I, K arm is connected with pin 7 of P2; the 8 pin of P2 is connected with the 3 end of A1.
The bridge arm overheat alarm bridge arm overheat tripping unit comprises QBJ 04P 3, and pins 11 and 12 of P3 are correspondingly connected with pins 11 and 12 of P2 respectively;
the pin 19 of the P3 is respectively connected with the pins 18-13 of the P3, namely, an L arm, a J arm, an H arm, an F arm, a D arm, a B arm, one end of a switch L115, one end of a switch J115, one end of a switch H115, one end of a switch F115, one end of a switch D115 and one end of a switch B115;
the pins 1 to 6 of P3 are respectively and correspondingly connected with one end of a switch A115, one end of a switch C115, one end of a switch E115, one end of a switch G115, one end of a switch I115 and one end of a switch K115, and the other ends of the switch A115, the switch C115, the switch E115 and the A, C, E, G, I, K are respectively and correspondingly connected with the arms A, C, E, G, I, K; the 8 pin of P3 is connected with the 2 end of A1.
The fast fusing alarm tripping unit comprises KRBJO 4P 1, the 5 pins of P1 are connected with an instrument isolator system unit through a relay K14 for controlling the alarm tripping of a fuse, the 6 pins of P1 are connected with the instrument isolator system unit, and the 3 pins and the 4 pins of P1 are connected with a PLC CPU control unit.
The instrument isolator system unit comprises a direct-current voltage part PV1, a direct-current part PA1, an intra-cabinet temperature acquisition part, a direct-current part E1, an intra-cabinet temperature part E2 and a fan part, wherein the input end of the PV1 is connected with a direct-current voltage sampling unit.
In fig. 6, the outputs of the various pins of the PLC control various signals through a plurality of intermediate relays K, the contacts of each intermediate relay K are labeled with terminal numbers, and each terminal is connected to external hardware (e.g., each button, indicator lamp, exhaust fan, etc.) by number.
The self-saturating reactor includes a control winding, a shift winding (offset winding), a backup winding, fig. 20. The direct current power is transmitted to one winding, the magnetic density of the self-saturation reactor is changed, and the alternating current power is indirectly regulated, so that the purpose of steady-state regulation is achieved.
The on-load tap changer controls the input alternating voltage at the primary side of the rectifier transformer and controls the output direct current value within a certain range. The on-load tap-changer is used in combination with a saturable reactor connected in series in the rectifier output circuit. By introducing a direct current in the reactor, a variable impedance is created in the line. By controlling the voltage drop across the reactor, the output value can be controlled within a relatively narrow range.
The high-voltage rectifying unit further comprises a high-voltage rectifying pile control system power supply unit, wherein the high-voltage rectifying pile control system power supply unit comprises a PLC touch screen working power supply part, a PLC DI power supply part, an isolator instrument power supply part, a sensor power supply part, an alarm instrument power supply part, a voltage sampling isolator power supply part and a control power failure part, and the input ends of the PLC touch screen working power supply part, the PLC DI power supply part, the isolator instrument power supply part, the sensor power supply part, the alarm instrument power supply part and the voltage sampling isolator power supply part are connected with the L1+ and L1-ends.
The charging pile comprises a charging pile control system, wherein the charging pile control system comprises a controller, a half-bridge chopper circuit, a sensing module, an optical coupling isolation circuit, a photoelectric coupler and a charging gun electronic lock, a detection signal input port of the controller is respectively connected with an input power supply, and a signal transmission port of the controller is respectively connected with a control signal input port of an electric energy output contactor, a control signal input port of an indicator light, a control signal input port of the charging gun electronic lock, a user communication port of the charging gun and a signal transmission port of a touch screen through the optical coupling isolation circuit;
The detection signal input port of the controller is respectively connected with the signal output port of a temperature sensor for detecting the temperature of a switching tube in the half-bridge chopper circuit, the signal output port of a temperature sensor for detecting the temperature of the charging gun and the detection signal output port of the CC1 control voltage detection circuit through a photoelectric coupler;
the control signal output port of the controller is connected with the control signal input port of the half-bridge chopper circuit.
The charging pile control system also comprises a logic combination circuit, wherein the input end of the logic combination circuit is used for collecting control system power failure information, charging gun electronic lock feedback information, contactor contact information, electric leakage information, scram information, insulation detection circuit information, panel switch information, indicator lamp information and door lock feedback information, and controlling each information safety alarm signal according to failure priority.
The logic combination circuit adopts an STM32F03 singlechip.
The controller is connected with a control signal input port of the half-bridge chopper circuit through the SG3525 chip and the optical fiber isolation circuit in sequence.
The charging pile control system further comprises a half-bridge chopper circuit short-circuit alarm circuit.
The half-bridge chopper circuit short-circuit alarm circuit adopts an insulation monitor connected to the output end of the half-bridge chopper circuit.
The half-bridge chopper circuit comprises IGBTs S1-S4, gates of the IGBTs S1-S4 are respectively connected with a control signal output port of the controller, a source electrode of the S1 is respectively connected with a drain electrode of the S2 and one end of an inductor L2, a drain electrode of the S1 is respectively connected with an anode of an electric energy input end of the half-bridge chopper circuit, one end of a capacitor C1 and a drain electrode of the S3, the other end of the capacitor C1 is respectively connected with a cathode of the electric energy input end of the half-bridge chopper circuit, a source electrode of the S2, one end of the capacitor C2 and a cathode of the electric energy output end of the half-bridge chopper circuit, the other end of the capacitor C2 is respectively connected with the other end of the inductor L2, the anode of the electric energy output end of the half-bridge chopper circuit and one end of the inductor L1, and the other end of the inductor L1 is respectively connected with a source electrode of the S3 and the drain electrode of the S4.
FIG. 18 shows that the switching tube driving signals of the bridge arms in each multi-channel chopper module are generated by a double closed-loop control circuit for limiting the output current by constant output voltage, the double closed-loop control circuit comprises a voltage PI regulator, a current PI regulator, a phase shifter and m carrier cross comparators, the m carrier cross comparators are in one-to-one correspondence with the m bridge arms in the multi-channel chopper module, the positive input end of the voltage PI regulator inputs the reference voltage, the negative input end of the voltage PI regulator inputs the output voltage of the multi-channel chopper module, the output end of the voltage PI regulator is connected with the positive input end of the current PI regulator, the negative input end of the current PI regulator inputs the output current of the multi-channel chopper module, the output end of the current PI regulator is connected with the positive input ends of the m carrier cross comparators, the phase shifter outputs m carrier signals with phase staggered sequentially by 2 PI/m to the negative input ends of the m carrier cross comparators, and each carrier cross comparator outputs the switching tube driving signals of the corresponding bridge arms.
The Uin is the direct current voltage provided by the rectifying part of the transformer, C1 is an input filter capacitor, S1, S2 and L2 form a half-bridge power topology, S3, S4 and L2 form another half-bridge power topology, C2 is an output filter capacitor, IL is an inductance current sampling (average value is equivalent to charging current), and Uo is a charging output voltage. g1-g4 correspond to the driving signals of S1-S4, and constant-current voltage limiting control of the charging power supply is realized through pulse width modulation of g1-g 4.
Fig. 19, including intelligent charging pile dynamic distribution system regulation loop, charging voltage given Uref and charging current given Iref are the reference values of charging voltage and current set, output voltage sample Uo and inductance current sample IL are the controlled amounts of charging power supply. The modulated wave obtained through the voltage regulator and the current regulator is intersected with two triangular carriers which are staggered by 180 degrees to generate driving signals g1-g4, and finally, the stable control of the charging power supply is realized. Wherein g1/g2 and g3/g4 work complementarily respectively.
The sensing module comprises a voltage sensor for detecting input voltage, a voltage sensor for detecting output voltage, a current sensor for detecting input current, a current sensor for detecting output current and a voltage sensor for detecting vehicle battery voltage.
The controller adopts an STM32F103 chip, and the ADC end of the STM32F103 chip is respectively connected with a detection signal output port of a voltage sensor for detecting input voltage, a detection signal output port of a voltage sensor for detecting output voltage, a detection signal output port of a current sensor for detecting input current, a detection signal output port of a current sensor for detecting output current and a detection signal output port of a voltage sensor for detecting vehicle battery voltage.
The charging pile control system further comprises a temperature compensation circuit
The photoelectric coupler adopts an HCNR201 module.
The charging pile control system further comprises an auxiliary power supply, wherein a signal transmission port of the auxiliary power supply is connected with a signal transmission port of the controller, an electric energy output port of the auxiliary power supply is connected with an auxiliary electric energy input port of the charger through a contactor KM5, and a control signal input port of the contactor KM5 is connected with a control signal output port of the controller.
The auxiliary power supply adopts a digital switching power supply.
The auxiliary power supply is connected with the AC/380V through the residual current protector sequentially through the discharging module and the air switch QF 2.
The positive electrode of the electric energy input end of the half-bridge chopper circuit is respectively connected with one end of a resistor R1 and one end of a first normally-open switch of a contactor KM2, the other end of the first normally-open switch of the contactor KM2 is respectively connected with one end of the first normally-open switch of the contactor KM1 and one end of a fuse FU1, and the other end of the first normally-open switch of the contactor KM1 is connected with the other end of the resistor R1; the other end of the fuse FU1 is respectively connected with one end of the rheostat RV1, one end of a first switch of the air switch QF1 and one end of the surge protector SPD1, the other end of the first switch of the air switch QF1 is connected with DC/840V, and the other end of the surge protector SPD1 is grounded; the other end of the rheostat RV1 is respectively connected with one end of the fuse FU2, one end of the second switch of the air switch QF1 and one end of the surge protector SPD2, the other end of the surge protector SPD2 is grounded, and the other end of the second switch of the air switch QF1 is connected with DC/840V; the other end of the fuse FU2 is connected with one end of a second normally open switch of the contactor KM1 and one end of a second normally open switch of the contactor KM2 respectively, and the other end of the second normally open switch of the contactor KM1 is connected with the other end of the second normally open switch of the contactor KM2 and the negative electrode of the electric energy input end of the half-bridge chopper circuit.
The invention also comprises a contact switch KV and a charging gun return detection contact switch Kl, which are arranged on the machine box door in the state of the monitoring equipment door, and detection signal output ports of KV and Kl are connected with a detection signal input port of the controller.
The positive electrode of the electric energy output end of the half-bridge chopper circuit is respectively connected with one end of a normally open switch of a contactor KM3, one end of a piezoresistor RV2, the positive electrode of an insulation monitor LMD and one end of a first normally open switch of a contactor KM4, the other end of the normally open switch of the contactor KM3 is respectively connected with the negative electrode of the electric energy output end of the half-bridge chopper circuit, the other end of the piezoresistor RV2, the negative electrode of the insulation monitor LMD and one end of a second normally open switch of the contactor KM4 through a resistor R3, and a control signal input port of the contactor KM4 is connected with a control signal input port of a controller;
the other end of the first normally open switch of the contactor KM4 is respectively connected with the positive electrode end of the voltmeter and the positive electrode end of the charging gun, the other end of the second normally open switch of the contactor KM4 is respectively connected with the negative electrode end of the voltmeter and the negative electrode end of the charging gun, and the detection signal output port of the voltmeter is connected with the detection signal input port of the controller.
The charging steps of the charging pile are as follows: precharge, connection validation, self-test phase, configuration phase, charge phase, and end phase.
The connection confirmation steps are as follows: the controller supplies power to the pre-charging gun electronic lock, the controller detects a feedback signal of the pre-charging gun electronic lock, and the controller detects a CC1 signal;
the self-checking stage comprises the following steps in sequence: closing a contactor KM3, detecting an insulation monitoring signal and a bleeder circuit;
the configuration stage comprises the following steps in sequence: the charging pile controller and the vehicle controller carry out handshake messages and close the contactor KM4;
the charging stage comprises the following steps in sequence: the charging pile controller is communicated with the vehicle controller; the charging pile controller regulates the voltage and current output by the electric energy of the half-bridge chopper circuit; judging whether charging is stopped or not, if not, repeating the charging stage step, and if so, entering an ending stage;
the ending stage comprises the following steps in sequence: the charging pile controller and the vehicle controller carry out charging suspension message, disconnect the contactor KM4, release the circuit, disconnect the contactor KM3, unlock the charging gun electronic lock and detect whether the charging gun returns or not.
The bleeder circuit is to discharge the electric charge stored on the filter capacitor of the output of the half-bridge chopper circuit quickly, so that the voltage on the capacitor is reduced immediately, and the electric charge stored on the filter capacitor is discharged quickly through the piezoresistor RV 2.
The mode for detecting whether the charging gun returns or not is as follows: through the K1 detection point, when the charging gun is pulled out for charging, the K1 normally-closed state is changed into the normally-open state, and when the charging gun returns, the K1 normally-open state is changed into the normally-closed state.
The method for judging whether charging is stopped is as follows: and charging by the charging mode preset by a user according to the electric quantity, the amount or the full charge, and stopping charging by the charging pile when the set condition is reached.
The charging pile controller stores the model, the characteristic and the mathematical model of the charging curve of the vehicle battery, when the vehicle controller is communicated with the charging pile controller, the charging pile controller reads the battery information of the vehicle, and the charging pile controller calls out the mathematical model matched with the characteristic of the vehicle battery according to the battery information of the vehicle to give charging current and voltage.
The switching tube driving signals of all bridge arms of the half-bridge chopper circuit are generated by a double closed-loop control circuit for limiting output current by constant output voltage, the double closed-loop control circuit comprises a voltage PI regulator, a current PI regulator, a phase shifter and m carrier cross comparators, the m carrier cross comparators are in one-to-one correspondence with the m bridge arms in the multi-channel chopper module, the positive input end of the voltage PI regulator inputs reference voltage, the negative input end of the voltage PI regulator inputs output voltage of the multi-channel chopper module, the output end of the voltage PI regulator is connected with the positive input end of the current PI regulator, the negative input end of the current PI regulator inputs output current of the multi-channel chopper module, the output end of the current PI regulator is connected with the positive input end of the m carrier cross comparators, the phase shifter outputs m carrier signals with 2 PI/m phase positions in sequence to the negative input end of the m carrier cross comparators, and each carrier cross comparator outputs corresponding switching tube driving signals.
The control signal output port of the controller is respectively connected with the positive input end of the first carrier cross comparator and the positive input end of the second carrier cross comparator sequentially through the low-voltage adjusting part, the constant-current limiting part and the current regulator, the negative input end of the first carrier cross comparator and the negative input end of the second carrier cross comparator are respectively connected with the output end of the carrier phase shifting part, the input end of the carrier phase shifting part is connected with the output end of the carrier generating part, and the control signal input end of the carrier generating part is connected with the control signal output port of the controller;
the output end of the first carrier cross comparator is respectively connected with the gate electrode of the S1 and the input end of the first inverting circuit, and the output end of the first inverting circuit is connected with the gate electrode of the S2; the output end of the second carrier cross comparator is respectively connected with the gate electrode of the S3 and the input end of the second inverting circuit, and the output end of the second inverting circuit is connected with the gate electrode of the S4;
the detection signal input port of the controller is respectively connected with the detection signal output port of the sensor for detecting the output voltage of the half-bridge chopper circuit and the signal output port of the sensor for detecting the output voltage of the half-bridge chopper circuit.
The invention also comprises a microcomputer protection monitoring part of the unit, a transformer cooling system, a rectification cooling system, a direct current sensor for detecting the output current and voltage of the rectification transformer, direct current gates S1-S4 and signal transmission ports of the PLC, wherein the signal transmission ports of the direct current gates are respectively connected with the signal transmission ports of the microcomputer protection monitoring part of the unit, the signal transmission ports of the transformer cooling system, the signal transmission ports of the rectification cooling system, the signal transmission ports of the direct current sensor and the signal transmission ports of the direct current gates.
The invention also comprises a PWM driving part, wherein a control signal input port of the PWM driving part is connected with a control signal output port of the PLC, and the control signal output port of the PWM driving part is respectively connected with a control signal input port of the A control part and a control signal input port of the B control part.
The control part A and the control part B comprise a control winding to the reactor and a displacement winding to the reactor, and a direct current power supply is transmitted to one of the windings, so that the magnetic density of the self-saturation reactor is changed, and the alternating current power is indirectly regulated; a controls TA1, B controls TA2; TA1 and TA2 correspond to the star-shaped structure part and the triangular connection structure part of the secondary winding respectively.
The control part A is connected with the reactor at the output end of the transformer TA1, and the control part B is connected with the reactor at the output end of the transformer TA 2.
The invention also comprises an A phase-shifting diode and a B phase-shifting diode, wherein the A phase-shifting diode is connected with a displacement winding port of the TA1 reactor, and the B phase-shifting diode is connected with a displacement winding port of the TA2 reactor of the transformer.
The invention also comprises a control conversion part, the control conversion part detects whether the working voltage of the direct current main loop is normal or not through the direct current sensor, if the working voltage exceeds the rated value by +/-10%, the control system can send out an instruction to the voltage regulating switch to regulate.
The rectification cooling system comprises a temperature sensor for detecting the rectification component and a cooling fan of the rectification component, wherein a detection signal output port of the temperature sensor is connected with a detection signal input port of the PLC, and a control signal output port of the PLC is connected with a control signal input port of the cooling fan of the rectification component.
The transformer cooling system comprises a temperature sensor for detecting the working temperature of the transformer and a transformer cooling fan, wherein a detection signal output port of the temperature sensor is connected with a detection signal input port of the PLC, and a control signal output port of the PLC is connected with a control signal input port of the transformer cooling fan.
The microcomputer protection monitoring part adopts a singlechip, and a detection signal input port of the singlechip is respectively connected with a detection signal output port of the high-voltage switch cabinet detection part, a detection signal output port of the on-load voltage regulating switch detection part, a detection signal output port of the transformer temperature detection part, a detection signal output port of the rectification system temperature detection part and a detection signal output port of the direct current loop detection part.
The invention also comprises an alternating current intelligent collector, a signal input port of the alternating current intelligent collector is connected with the TA1, a detection signal output port of the TA2 is connected with a signal input port of the alternating current conversion part,
The signal output port of the alternating current intelligent collector is respectively connected with the signal input port of the first synchronous detection part and the signal input port of the second synchronous detection part, the signal output port of the first synchronous detection part is connected with the signal input port of the first MCU, the signal output port of the second synchronous detection part is connected with the signal input port of the second MCU, the control signal output port of the first MCU is connected with the control signal input port of the first pulse power amplification part, and the control signal output port of the first pulse power amplification part is connected with the gate electrode of the first thyristor for controlling the voltage regulating switch;
the control signal output port of the second MCU is connected with the control signal input port of the second pulse power amplifier part, and the control signal output port of the second pulse power amplifier part is connected with the gate electrode of the second thyristor for controlling the voltage regulating switch; the cathode of the first thyristor is connected with the L+ end through a switch QS2, the anode of the first thyristor is connected with the cathode of the second thyristor, and the anode of the second thyristor is connected with the L-end through a switch QS 3.
The invention also comprises a first channel monitoring part, a second channel monitoring part, a first LCD display keyboard part, a second LCD display keyboard part, a first communication interface part, a second communication interface part, a first A/D variable part, a second A/D variable part, a first switching value I/O part and a second switching value I/O part, wherein the first MCU is respectively connected with the first channel monitoring part, the first LCD display keyboard part, the first communication interface part, the first A/D variable part and the first switching value I/O part;
The second MCU is respectively connected with the second channel monitoring part, the second LCD display keyboard part, the second communication interface part, the second A/D variable part and the second switching value I/O part;
the first communication interface part and the second communication interface part are respectively connected with the unit PLC monitoring part; the first A/D variable part and the second A/D variable part are respectively connected with the alternating current conversion part and the thyristor conductivity control part on the cathode of the first thyristor;
TA1 and TA2 correspond to the star-shaped structure part and the triangular connection structure part of the secondary winding respectively.
The first pulse power amplifier part and the second pulse power amplifier part adopt signal amplifiers.
The alternating current conversion part adopts an A/D variable module. The alternating current conversion part collects alternating current signals and direct current main loop signals.
The synchronization detecting section detects the synchronicity of the rectification system.
In fig. 21, TV is a voltage transformer, and detects a bus voltage. The channel monitoring comprises external switching value, analog quantity detection, strong power supply voltage detection, pulse detection monitoring and dual-machine hot standby channel monitoring.
The controller is a system composed of digital processors, the synchronous signals are transformed into the processor (MCU), the pulse signals are output by the processor, and the phase sequence of the trigger pulse can be set on the LCD touch display screen.
And (3) synchronous detection: and detecting the PT three-phase synchronous signal of the power grid, and starting a digital trigger pulse under the condition that the distortion degree of the synchronous frequency signal is ensured when the digital controller starts working, otherwise, sending out a desynchronized signal.
Pulse power amplifier: and outputting a high-power pulse wave signal in a bandwidth range, and performing power setting, gain adjustment and timing test.
Channel monitoring: the pulse transmission process and the state of the pulse power amplifier tube are monitored. And monitoring the working state of the controller, and sending out a signal of normal working state of the channel. And when the working channel numerical controller works abnormally or has internal faults, sending out a channel fault signal, and starting a standby channel.
Triggering a power supply: and monitoring the output of the pulse power amplifier, and when the voltage fluctuates or is lower than a magnitude, sending out a failure triggering power supply state fault alarm, blocking the pulse and stopping working a normal state signal.
Alternating current conversion: the voltage and current signals of the power grid are acquired by the transformer and are converted into signal formats required by the A/D variable module and then input into the A/D variable module.
When the secondary voltage of the transformer is lower than the rated value, the load is adjusted to the upper end, and the primary winding of the transformer is reduced, so that the purpose of improving the voltage is achieved. When the secondary voltage of the transformer is higher than the rated value, the load is adjusted to the lower end, and the primary winding of the transformer is increased, so that the purpose of reducing the voltage is achieved.
The micro-grid power supply system comprises a micro-grid controller, wherein the signal transmission port of the micro-grid controller is respectively connected with the signal transmission port of the photovoltaic inverter, the signal transmission port of the active power filter, the signal transmission port of the energy storage inverter, the signal transmission port of the fan inverter and the signal transmission port of the micro-grid energy power system,
the micro-grid energy power system adopts a computer.
The micro-grid controller comprises an MCU and a DSP, wherein a signal transmission port of the MCU is connected with a signal transmission port of the DSP, a control signal output port of the MCU is connected with an input port of a first IPM module, an output port of the first IPM module is connected with a control port of a DC/DC module, an input port of the DC/DC module is connected with a photovoltaic module, and an output port of the DC/DC module is connected with an input port of the first AC/DC module;
the control signal input port of the first AC/DC module is connected with the output port of the second IPM module, the input port of the second IPM module is connected with the DSP control signal output port, the DSP control signal output port is connected with the control signal input port of the bidirectional AC/DC module, the bidirectional AC/DC module is respectively connected with the storage battery pack, the output port of the first AC/DC module and one end of the first contactor, and the signal input port of the DSP is connected with the signal output port of the photovoltaic power generation and wind power generation load state sampling module;
The control signal input port of the first contactor is connected with the control signal output port of the DSP through the relay, the other end of the first contactor is respectively connected with an alternating current load and the input end of the second AC/DC module, the output end of the second AC/DC module is connected with a direct current load, the alternating current load is connected with the wind driven generator through the second contactor, and the control signal input port of the second contactor is connected with the control signal output port of the DSP through the relay.
The micro-grid energy power system comprises a data layer, a management layer and a scheduling layer, wherein the data layer dynamically collects the change of the generated power and the load real-time power of each power generation unit in real time, the collected data is sent to the management layer for data analysis and optimization, and then the scheduling layer is used for distributing each unit.
The data layer comprises an information acquisition part, a data management part, a state prediction part, an energy rate prediction part and a network topology analysis part; the management layer comprises a load switching part, a system management part, an energy storage management part, a tide calculation part, a reactive power optimization part and an economic optimization part; the dispatching layer comprises a generator set dispatching part, an energy storage charge and discharge management part and a load management and dispatching part.
The micro-grid energy power unit diagram 25 is characterized in that the energy power system is composed of data acquisition, system management and power utilization scheduling. The data acquisition mainly realizes real-time dynamic acquisition on the change of the power generation power and the load real-time power of each power generation unit, the acquired data is sent to a system management layer for data analysis and optimization, and then the distribution of each unit is carried out through a system scheduling layer, so that the micro-grid system is ensured to be in the best economic operation to the greatest extent
In fig. 24, the sampling module samples the photovoltaic power generation, wind power generation and load conditions, sends the samples to the DSP, and performs photovoltaic and wind power switching according to preset priorities, and the DSP drives the contactor by controlling the relay due to larger power generation and load power. MCU and DSP embedded singlechip mutually control through IPM module (intelligent power module) control photovoltaic power generation direct current output.
The invention also comprises a micro-grid battery management system, wherein the micro-grid battery management system comprises a host module, a slave module, a protection board module and a display module;
the slave module and the host module measure the voltage and the temperature of the battery and balance the energy of the battery; the protection board module performs SOC calculation, SOH calculation and generates alarm data; the host module controls charging and discharging of the protection board, counts battery pack information, detects system state and controls the system state; the display module displays the data of the battery, gives out audible and visual alarm and records the data.
The battery management system provides battery voltage monitoring and alarming, battery pack temperature monitoring and alarming and battery electric quantity balancing. The battery management system is responsible for monitoring each group of series battery units, and the monitored battery units can be one large-capacity battery unit or a combination of a plurality of small-capacity batteries connected in parallel according to different battery composition modes. In fig. 26, the main control module communicates with the acquisition module through a 485 bus interface, and the BMS dynamically formulates a battery management policy by collecting and analyzing data of the battery pack in real time and controls the battery to work under a proper working condition through means of balanced management, charge management, discharge management, boundary management and the like. The system has rich external interfaces, can meet the application requirements of various occasions, and the interfaces comprise: the system comprises a voltage acquisition input interface, a temperature acquisition input interface, a host communication interface, a slave communication and a slave host address selection switch; the protection board is provided with a current sensor interface, a temperature sensor interface, a battery pack cathode interface and a communication interface.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.

Claims (2)

1. The micro-grid power supply system comprises a main switch, a step-up transformer, a first switch, a photovoltaic inverter, a photovoltaic module, a second switch, a fan inverter, a wind driven generator, a third switch, an energy storage inverter, an energy storage battery, a fourth switch and an active power filter, and is characterized in that one end of the main switch is connected with a secondary bus, the other end of the main switch is connected with the output end of the step-up transformer, the input end of the step-up transformer is respectively connected with one end of the first switch, one end of the second switch, one end of the third switch and one end of the fourth switch, one end of the first switch is connected with the output end of the photovoltaic inverter, and the input end of the photovoltaic inverter is connected with the output end of the photovoltaic module;
the other end of one end of the second switch is connected with the output end of the fan inverter, and the input end of the fan inverter is connected with the output end of the wind driven generator;
the other end of one end of the third switch is connected with the output end of the energy storage inverter, and the input end of the energy storage inverter is connected with the energy storage battery;
the other end of the fourth switch Guan Yiduan is connected with an active power filter;
the micro-grid power supply system further comprises a micro-grid controller, wherein a signal transmission port of the micro-grid controller is respectively connected with a signal transmission port of the photovoltaic inverter, a signal transmission port of the active power filter, a signal transmission port of the energy storage inverter, a signal transmission port of the fan inverter and a signal transmission port of the micro-grid energy power system;
The micro-grid controller comprises an MCU and a DSP, wherein a signal transmission port of the MCU is connected with a signal transmission port of the DSP, a control signal output port of the MCU is connected with an input port of a first IPM module, an output port of the first IPM module is connected with a control port of a DC/DC module, an input port of the DC/DC module is connected with a photovoltaic module, and an output port of the DC/DC module is connected with an input port of the first AC/DC module;
the control signal input port of the first AC/DC module is connected with the output port of the second IPM module, the input port of the second IPM module is connected with the DSP control signal output port, the DSP control signal output port is connected with the control signal input port of the bidirectional AC/DC module, the bidirectional AC/DC module is respectively connected with the storage battery pack, the output port of the first AC/DC module and one end of the first contactor, and the signal input port of the DSP is connected with the signal output port of the photovoltaic power generation and wind power generation load state sampling module;
the control signal input port of the first contactor is connected with the control signal output port of the DSP through a relay, the other end of the first contactor is respectively connected with an alternating current load and the input end of the second AC/DC module, the output end of the second AC/DC module is connected with a direct current load, the alternating current load is connected with a wind driven generator through the second contactor, and the control signal input port of the second contactor is connected with the control signal output port of the DSP through the relay;
The micro-grid energy power system comprises a data layer, a management layer and a scheduling layer, wherein the data layer dynamically collects the change of the power generation power and the load real-time power of each power generation unit in real time, the collected data is sent to the management layer for data analysis and optimization, and then the scheduling layer is used for distributing each unit;
the data layer comprises an information acquisition part, a data management part, a state prediction part, an energy rate prediction part and a network topology analysis part; the management layer comprises a load switching part, a system management part, an energy storage management part, a tide calculation part, a reactive power optimization part and an economic optimization part; the dispatching layer comprises a generator set dispatching part, an energy storage charge and discharge management part and a load management and dispatching part;
the micro-grid power supply system further comprises a micro-grid battery management system, wherein the micro-grid battery management system comprises a host module, a slave module, a protection board module and a display module;
the slave module and the host module measure the voltage and the temperature of the battery and balance the energy of the battery; the protection board module performs SOC calculation, SOH calculation and generates alarm data; the host module controls charging and discharging of the protection board, counts battery pack information, detects system state and controls the system state; the display module displays the data of the battery, gives out audible and visual alarm and records the data.
2. The microgrid power supply system according to claim 1, characterized in that said microgrid energy power system employs a computer.
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