CN115378105B - Energy management system of energy storage power station - Google Patents

Energy management system of energy storage power station Download PDF

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Publication number
CN115378105B
CN115378105B CN202211292420.2A CN202211292420A CN115378105B CN 115378105 B CN115378105 B CN 115378105B CN 202211292420 A CN202211292420 A CN 202211292420A CN 115378105 B CN115378105 B CN 115378105B
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triode
diode
capacitor
transformer
resistor
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CN115378105A (en
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张威
薛海涛
徐沛
李光正
樊崇
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Nanyang Jinguan Intelligent Switch Co ltd
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Nanyang Jinguan Intelligent Switch Co ltd
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    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • 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
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of power supplies, and provides an energy management system of an energy storage power station, wherein a storage battery charging circuit comprises a transformer T1, the primary side of the transformer T1 is used for being connected with the voltage of a power grid, the secondary side of the transformer T1 comprises a plurality of isolated single battery charging circuits, as shown in figure 1, any single battery charging circuit comprises a diode D1, an MOS tube Q1, a diode D2, an inductor L2 and a capacitor C1, the anode of the diode D1 is connected with the first path secondary side output homonymous end of the transformer T1, the cathode of the diode D1 is connected with the drain electrode of the MOS tube Q1, the grid of the MOS tube Q1 is connected with a single battery controller, the source electrode of the MOS tube Q1 is connected with the first end of the inductor L2, the second end of the inductor L2 is connected with the first path secondary side output homonymous end of the transformer T1 through the capacitor C1, and two ends of the capacitor C1 are used for being connected with single batteries. Through above-mentioned technical scheme, the problem that energy storage power station monomer battery charges unevenly among the correlation technique, leads to energy storage power station regulating power to reduce has been solved.

Description

Energy management system of energy storage power station
Technical Field
The invention relates to the technical field of power supplies, in particular to an energy management system of an energy storage power station.
Background
The battery energy storage system of the energy storage power station is used for peak clipping and valley filling of general power grid power distribution users, electric energy of the electricity price at the valley time is stored in the battery pack in a direct current mode, the electricity price is output to each electric equipment at the peak time in the power frequency period, and the problem of insufficient electric power at the peak time of electricity utilization is solved, so that the battery energy storage system is widely popularized.
The storage battery pack is used as an energy storage unit of the energy storage power station, and the working performance of the storage battery pack directly influences the adjusting capacity of the whole energy storage power station. Because the monomer batteries in the storage battery pack have unavoidable inconsistency, the inconsistency can cause the monomer batteries to be unevenly charged, and the phenomenon that the battery with low capacity in the storage battery pack is easier to be overcharged, the service performance of the battery is reduced, and the regulation capability of the whole energy storage power station is further influenced is shown.
Disclosure of Invention
The invention provides an energy management system of an energy storage power station, which solves the problem that the adjustment capacity of the energy storage power station is reduced due to uneven charging of single batteries of the energy storage power station in the related technology.
The technical scheme of the invention is as follows: comprises a storage battery charging circuit, the storage battery charging circuit comprises a transformer T1, the primary side of the transformer T1 is used for being connected with the voltage of a power grid, the secondary side of the transformer T1 comprises a multi-path isolated single battery charging circuit,
any single battery charging circuit comprises a diode D1, an MOS tube Q1, a diode D2, an inductor L2 and a capacitor C1, wherein the anode of the diode D1 is connected with the first path of secondary output homonymous end of the transformer T1, the cathode of the diode D1 is connected with the drain of the MOS tube Q1, the grid of the MOS tube Q1 is connected with a single battery controller, the source of the MOS tube Q1 is connected with the first end of the inductor L2, the second end of the inductor L2 is connected with the first path of secondary output heteronymous end of the transformer T1 through the capacitor C1, and the two ends of the capacitor C1 are used for connecting single batteries,
the source electrode of the MOS tube Q1 is connected with the cathode of the diode D2, and the anode of the diode D2 is connected to the first path of secondary side output synonym end of the transformer T1.
Furthermore, the secondary side of the transformer T1 also comprises a plurality of isolated voltage conversion circuits, any one of the voltage conversion circuits comprises a diode D3, a diode D4, an inductor L3 and a capacitor C4, the anode of the diode D3 is connected with the second secondary side output homonymous end of the transformer T1, the cathode of the diode D3 is connected with the first end of the inductor L3, the second end of the inductor L3 is connected with the second secondary side output heteronymous end of the transformer T1 through the capacitor C4, the two ends of the capacitor C4 are used for supplying power to the single battery controller,
the cathode of the diode D3 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected to the second secondary side output synonym end of the transformer T1.
Further, still include temperature detection module U1, temperature detection module U1 is used for detecting ambient temperature, temperature detection module U1's output connection the monomer battery controller.
Further comprises a storage battery discharging circuit, the storage battery discharging circuit comprises a booster circuit and an inverter which are sequentially connected, the input end of the booster circuit is connected with the voltage output end of the storage battery pack, the output end of the inverter is used for being connected with the voltage of a power grid,
the booster circuit comprises an inductor L1, an MOS tube Q10, an MOS tube Q11 and a capacitor C5, wherein the first end of the inductor L1 is connected with the positive end output of the storage battery pack, the second end of the inductor L1 is connected with the drain electrode of the MOS tube Q10, the source electrode of the MOS tube Q10 is grounded,
the second end of the inductor L1 is connected with the first end of a capacitor C5, the second end of the capacitor C5 is connected with the source electrode of the MOS transistor Q11, the drain electrode of the MOS transistor Q11 is grounded,
and the grid electrode of the MOS tube Q10 and the grid electrode of the MOS tube Q11 are both connected with the single battery controller.
Further, the solar cell module comprises an MOS tube driving circuit, wherein the MOS tube driving circuit comprises a triode Q13, a triode Q12 and a triode Q14, the base electrode of the triode Q13 is connected with the monomer battery controller, the emitting electrode of the triode Q13 is grounded, the collecting electrode of the triode Q13 is connected with a power supply VCC through a resistor R3, the collecting electrode of the triode Q13 is connected with the base electrode of the triode Q12, the emitting electrode of the triode Q12 is connected with the power supply VCC, the collecting electrode of the triode Q13 is grounded through a resistor R4, the collecting electrode of the triode Q13 is connected with the grid electrode of the MOS tube Q10,
triode Q14's base with monomer battery controller connects, power VCC is connected to triode Q14's projecting pole, triode Q14's collecting electrode is connected with resistance R6's first end, resistance R6's second end inserts MOS pipe Q11's source electrode, resistance R6's first end inserts MOS pipe Q11's grid.
Further, the inverter comprises a power grid voltage zero-crossing detection circuit connected with the inverter controller, the power grid voltage zero-crossing detection circuit comprises a voltage sampling circuit, a comparator U3, a resistor R8, a capacitor C6 and a triode Q20 which are connected in sequence,
the voltage sampling circuit is used for collecting the power grid voltage, the output end of the voltage sampling circuit is connected to the non-inverting input end of the comparator U3, the inverting input end of the comparator U3 is grounded, the output end of the comparator U3 is connected with the first end of the capacitor C6, the second end of the capacitor C6 is grounded through a resistor R8, the second end of the capacitor C6 is connected to the base electrode of the triode Q20, the emitting electrode of the triode Q20 is grounded, the collecting electrode of the triode Q20 is connected with a power supply 5V, the collecting electrode of the triode Q20 is grounded through a resistor R16, and the collecting electrode of the triode Q20 is used as the output of the power grid voltage zero-crossing circuit and is connected to the inverter controller.
Further, voltage sampling circuit is including resistance R12, resistance R11, resistance R9, resistance R14 and the resistance R13 of establishing ties, resistance R12's one end and electric wire netting L line connection, resistance R13's one end and electric wire netting N line connection, the homophase input of U2 is put in fortune to resistance R9's first end access, resistance R9's second end access U2's inverting input is put to fortune, U2's output is put through resistance R17 feedback connection to U2's homophase input is put to fortune, U2's output is put to fortune as voltage sampling circuit's output is inserted comparator U3's homophase input.
The working principle and the beneficial effects of the invention are as follows:
according to the invention, the secondary side of the transformer T1 is provided with multi-path isolated output, so that the single battery is independently charged, and the problem of uneven charging of a plurality of single batteries in the storage battery pack is avoided.
Taking one path of single battery charging circuit as an example, when the MOS transistor Q1 is turned on, the output of the first path of secondary side of the transformer T1 charges the inductor L2 and the capacitor C1, and the inductor L2 stores energy; when the MOS transistor Q1 is cut off, the inductor L2 charges the capacitor C1 through the diode D2; the voltage across the capacitor C1 charges the cell. The on and off of the MOS tube Q1 are controlled by a single battery controller, and the single battery controller outputs PWM signals with different duty ratios to a grid electrode of the MOS tube Q1, so that the charging voltage of the single battery is adjusted.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a single battery charging circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of a temperature detection module U1 according to the present invention;
FIG. 3 is a schematic diagram of a battery discharge circuit of the present invention;
FIG. 4 is a schematic diagram of a grid voltage zero crossing detection circuit of the present invention;
in the figure: the system comprises a single battery charging circuit 1, a temperature detection module U1, a storage battery discharging circuit 3 and a power grid voltage zero-crossing detection circuit 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
The energy management system of the energy storage power station in the embodiment comprises a storage battery charging circuit, the storage battery charging circuit comprises a transformer T1, the primary side of the transformer T1 is used for being connected with the voltage of a power grid, the secondary side of the transformer T1 comprises a plurality of isolated single battery charging circuits, as shown in figure 1, any single battery charging circuit comprises a diode D1, a MOS tube Q1, a diode D2, an inductor L2 and a capacitor C1, the anode of the diode D1 is connected with the same-name output end of the first secondary side of the transformer T1, the cathode of the diode D1 is connected with the drain electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a single battery controller, the source electrode of the MOS tube Q1 is connected with the first end of the inductor L2, the second end of the inductor L2 is connected with the different-name output end of the first secondary side of the transformer T1 through the capacitor C1, and two ends of the capacitor C1 are used for being connected with single batteries,
the source electrode of the MOS tube Q1 is connected with the cathode electrode of the diode D2, and the anode electrode of the diode D2 is connected to the first path of secondary side output synonym end of the transformer T1.
According to the invention, the secondary side of the transformer T1 is provided with the multi-path isolated output, so that the single battery is independently charged, and the problem of uneven charging of a plurality of single batteries in the storage battery pack is avoided.
Taking one path of single battery charging circuit as an example, when the MOS transistor Q1 is turned on, the output of the first path of secondary side of the transformer T1 charges the inductor L2 and the capacitor C1, and the inductor L2 stores energy; when the MOS transistor Q1 is cut off, the inductor L2 charges the capacitor C1 through the diode D2; the voltage across the capacitor C1 charges the cell. The on and off of the MOS tube Q1 are controlled by a single battery controller, and the single battery controller outputs PWM signals with different duty ratios to a grid electrode of the MOS tube Q1, so that the charging voltage of the single battery is adjusted.
Further, the secondary side of the transformer T1 further includes a plurality of isolated voltage conversion circuits, as shown in fig. 1, any one of the voltage conversion circuits includes a diode D3, a diode D4, an inductor L3, and a capacitor C4, an anode of the diode D3 is connected to the second secondary side output homonymous terminal of the transformer T1, a cathode of the diode D3 is connected to the first terminal of the inductor L3, the second terminal of the inductor L3 is connected to the second secondary side output heteronymous terminal of the transformer T1 through the capacitor C4, two ends of the capacitor C4 are used for supplying power to the cell controller,
the cathode of the diode D3 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected to the second secondary side output synonym end of the transformer T1.
The present embodiment is further provided with a multi-way isolated voltage conversion circuit for providing power to each cell controller. Taking one of the voltage conversion circuits as an example, the secondary side output of the second circuit of the transformer T1 is rectified by the diode D2 and the diode D4, and then filtered by the inductor L3 and the capacitor C4 to obtain a stable 12V voltage, which is used to supply power to the cell controller.
Further, the battery pack further comprises a temperature detection module U1, as shown in fig. 2, the temperature detection module U1 is used for detecting the ambient temperature, and the output of the temperature detection module U1 is connected to the cell controller.
According to the correlation between the service life of the storage battery and the float charging voltage and temperature, when the environmental temperature is low, the storage battery can not be fully charged only by constant voltage charging; when the ambient temperature is high, the constant voltage charging can cause the battery to be overcharged, which affects the service life of the battery. This embodiment detects ambient temperature through setting up temperature detection module U1, adjusts battery cell's charging voltage according to ambient temperature, and the chemical reaction activity of compensation battery cell under the different temperature condition is favorable to improving battery cell's life.
Further comprises a storage battery discharge circuit, the storage battery discharge circuit comprises a booster circuit and an inverter which are connected in sequence, the input end of the booster circuit is connected with the voltage output end of the storage battery pack, the output end of the inverter is used for being connected with the voltage of a power grid,
as shown in fig. 3, the boost circuit includes an inductor L1, a MOS transistor Q10, a MOS transistor Q11 and a capacitor C5, a first end of the inductor L1 is connected to the positive terminal output of the battery pack, a second end of the inductor L1 is connected to the drain of the MOS transistor Q10, the source of the MOS transistor Q10 is grounded,
the second end of the inductor L1 is connected with the first end of the capacitor C5, the second end of the capacitor C5 is connected with the source electrode of the MOS transistor Q11, the drain electrode of the MOS transistor Q11 is grounded,
the grid electrode of the MOS tube Q10 and the grid electrode of the MOS tube Q11 are both connected with the single battery controller.
When the MOS tube Q10 is switched on and the MOS tube Q11 is switched off, the voltage of the storage battery pack charges the inductor L1 through the MOS tube Q10, and the inductor L1 stores energy; when the MOS tube Q10 is cut off and the MOS tube Q11 is conducted, the voltage of the storage battery pack and the inductor L1 charge the capacitor C1 together, and the function of the booster circuit is realized. In the embodiment, the MOS transistor Q11 is used to replace a diode in the conventional BOOST circuit, and the conduction loss of the MOS transistor is much smaller than that of the diode, so that the efficiency of the BOOST circuit is improved.
Further, the device also comprises an MOS tube driving circuit, as shown in fig. 3, the MOS tube driving circuit comprises a triode Q13, a triode Q12 and a triode Q14, the base of the triode Q13 is connected with the monomer battery controller, the emitter of the triode Q13 is grounded, the collector of the triode Q13 is connected with a power VCC through a resistor R3, the collector of the triode Q13 is connected with the base of the triode Q12, the emitter of the triode Q12 is connected with the power VCC, the collector of the triode Q13 is grounded through a resistor R4, the collector of the triode Q13 is connected with the grid of the MOS tube Q10,
the base of triode Q14 is connected with monomer battery controller, and power VCC is connected to triode Q14's projecting pole, and triode Q14's collecting electrode is connected with resistance R6's first end, and resistance R6's second end inserts MOS pipe Q11's source electrode, and resistance R6's first end inserts MOS pipe Q11's grid.
And the triode Q12, the triode Q13 and the triode Q14 form an inverter to realize the synchronous control of the MOS tube Q10 and the MOS tube Q11. The specific process is as follows: when a PWM1 signal output by the monomer battery controller is at a high level, the triode Q13 is conducted, the collector of the triode Q13 is grounded, the base of the triode Q12 is at a low level, the triode Q12 is conducted, the collector of the triode Q12 is connected with a power supply VCC, the power supply VCC is added to the grid of the MOS tube Q10, the MOS tube Q10 is conducted, meanwhile, the triode Q4 is cut off, the collector of the triode Q4 is at a low level, and the MOS tube Q11 is cut off; on the contrary, when the PWM1 signal of monomer battery controller output is the low level, triode Q13 ends, and the collecting electrode of triode Q13 connects the power VCC, and the base of triode Q12 is the high level, and triode Q12 ends, and triode Q12's collecting electrode ground connection, MOS pipe Q10 ends, and simultaneously, triode Q4 switches on, and the collecting electrode of triode Q4 connects the power VCC, and the power VCC adds the grid at MOS pipe Q11, and MOS pipe Q11 switches on.
Further, the inverter includes a grid voltage zero crossing detection circuit connected to the inverter controller, as shown in fig. 4, the grid voltage zero crossing detection circuit includes a voltage sampling circuit, a comparator U3, a resistor R8, a capacitor C6 and a transistor Q20 connected in sequence,
the voltage sampling circuit is used for collecting the voltage of a power grid, the output end of the voltage sampling circuit is connected to the in-phase input end of the comparator U3, the inverting input end of the comparator U3 is grounded, the output end of the comparator U3 is connected with the first end of the capacitor C6, the second end of the capacitor C6 is grounded through the resistor R8, the second end of the capacitor C6 is connected to the base of the triode Q20, the emitting electrode of the triode Q20 is grounded, the collecting electrode of the triode Q20 is connected with the power supply 5V, the collecting electrode of the triode Q20 is grounded through the resistor R16, and the collecting electrode of the triode Q20 is used as the output of the zero-crossing circuit of the voltage of the power grid and is connected to the inverter controller.
After the voltage of the storage battery pack is boosted by the booster circuit, the voltage is converted into alternating current voltage by the inverter and is merged into a power grid, and the flow of electric energy from the storage battery pack to the power grid is realized. The grid voltage zero-crossing detection circuit is used for detecting the positive zero-crossing point of the grid voltage, so that the output voltage of the inverter is kept in the same phase with the grid voltage. The working principle is as follows: the output of the voltage sampling circuit is connected to the non-inverting input end of a comparator U3, the inverting input end of the comparator U3 is grounded, the output voltage of the voltage sampling circuit is positive in the positive half cycle of the power grid voltage, the comparator U3 outputs high level, the output voltage of the voltage sampling circuit is negative in the negative half cycle of the power grid voltage, and the comparator U3 outputs low level; the output end of the comparator U3 is a step signal at the positive zero crossing point of the power grid voltage, the capacitor C6 and the resistor R8 form a differential circuit, a pulse signal is output at the second end of the capacitor C6, the triode Q20 is conducted by the pulse signal, the collector of the triode Q20 outputs the pulse signal, the inversion controller captures the falling edge of the pulse signal, and the fast and accurate detection of the zero crossing point of the power grid voltage is realized.
Because the triode Q20 needs a certain time to be conducted, if the time of the step signal at the output end of the comparator U3 is too short, the triode Q20 cannot be conducted, so that narrow pulses caused by interference signals are filtered, and accurate detection of zero crossing points is realized.
Further, as shown in fig. 4, the voltage sampling circuit includes a resistor R12, a resistor R11, a resistor R9, a resistor R14, and a resistor R13 connected in series, one end of the resistor R12 is connected to the L line of the power grid, one end of the resistor R13 is connected to the N line of the power grid, the first end of the resistor R9 is connected to the non-inverting input terminal of the operational amplifier U2, the second end of the resistor R9 is connected to the inverting input terminal of the operational amplifier U2, the output terminal of the operational amplifier U2 is connected to the non-inverting input terminal of the operational amplifier U2 through a resistor R17 in a feedback manner, and the output terminal of the operational amplifier U2 is used as the output of the voltage sampling circuit and is connected to the non-inverting input terminal of the comparator U3.
The resistor R12, the resistor R11, the resistor R9, the resistor R14 and the resistor R13 form a series voltage division circuit, the voltage at two ends of the resistor R9 and the power grid voltage change in proportion, and the power grid voltage can be obtained by detecting the voltage at two ends of the resistor R9. The voltages at the two ends of the resistor R9 are respectively connected to the inverting input end and the non-inverting input end of the operational amplifier U2, the operational amplifier U2 forms a subtraction operation circuit, the output voltage of the operational amplifier U2 and the voltages at the two ends of the resistor R9 are changed in proportion, and therefore the power grid voltage can be obtained by detecting the output voltage of the operational amplifier U2. The circuit has simple structure and low cost.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. An energy management system of an energy storage power station comprises a storage battery and is characterized by comprising a storage battery charging circuit, wherein the storage battery charging circuit comprises a transformer T1, the primary side of the transformer T1 is used for being connected with the voltage of a power grid, the secondary side of the transformer T1 comprises a plurality of isolated single battery charging circuits (1),
any one single battery charging circuit (1) comprises a diode D1, an MOS tube Q1, a diode D2, an inductor L2 and a capacitor C1, wherein the anode of the diode D1 is connected with the first path of secondary side output homonymy end of the transformer T1, the cathode of the diode D1 is connected with the drain electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a single battery controller, the source electrode of the MOS tube Q1 is connected with the first end of the inductor L2, the second end of the inductor L2 is connected with the first path of secondary side output heteronymy end of the transformer T1 through the capacitor C1, the two ends of the capacitor C1 are used for connecting single batteries,
the source electrode of the MOS tube Q1 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the first path of secondary side output synonym end of the transformer T1,
the storage battery charging system further comprises a storage battery discharging circuit (3), the storage battery discharging circuit (3) comprises a booster circuit and an inverter which are sequentially connected, the input end of the booster circuit is connected with the voltage output end of the storage battery pack, the output end of the inverter is used for being connected with the voltage of a power grid,
the booster circuit comprises an inductor L1, an MOS tube Q10, an MOS tube Q11 and a capacitor C5, wherein the first end of the inductor L1 is connected with the positive end output of the storage battery pack, the second end of the inductor L1 is connected with the drain electrode of the MOS tube Q10, the source electrode of the MOS tube Q10 is grounded,
the second end of the inductor L1 is connected with the first end of a capacitor C5, the second end of the capacitor C5 is connected with the source electrode of the MOS transistor Q11, the drain electrode of the MOS transistor Q11 is grounded,
the grid electrode of the MOS tube Q10 and the grid electrode of the MOS tube Q11 are both connected with the single battery controller,
still include MOS pipe drive circuit, MOS pipe drive circuit includes triode Q13, triode Q12 and triode Q14, triode Q13's base with monomer battery controller connects, triode Q13's projecting pole ground connection, triode Q13's collecting electrode passes through resistance R3 and connects the power VCC, triode Q13's collecting electrode inserts triode Q12's base, triode Q12's projecting pole VCC that connects, triode Q13's collecting electrode passes through resistance R4 ground connection, triode Q13's collecting electrode inserts MOS pipe Q10's grid,
triode Q14's base with monomer battery controller connects, power VCC is connected to triode Q14's projecting pole, triode Q14's collecting electrode is connected with resistance R6's first end, resistance R6's second end inserts MOS pipe Q11's source electrode, resistance R6's first end inserts MOS pipe Q11's grid.
2. The energy management system of the energy storage power station of claim 1, wherein the secondary side of the transformer T1 further comprises multiple isolated voltage conversion circuits, each voltage conversion circuit comprises a diode D3, a diode D4, an inductor L3 and a capacitor C4, the anode of the diode D3 is connected with the same-name output end of the second secondary side of the transformer T1, the cathode of the diode D3 is connected with the first end of the inductor L3, the second end of the inductor L3 is connected with the different-name output end of the second secondary side of the transformer T1 through the capacitor C4, and two ends of the capacitor C4 are used for supplying power to the single battery controller,
the cathode of the diode D3 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected to the second secondary side output synonym end of the transformer T1.
3. The energy storage power station energy management system of claim 1, further comprising a temperature detection module U1 (2), wherein the temperature detection module U1 (2) is used for detecting the ambient temperature, and the output of the temperature detection module U1 (2) is connected to the single cell controller.
4. The energy storage power station energy management system of claim 1, characterized in that the inverter comprises a grid voltage zero-crossing detection circuit (4) connected with the inverter controller, the grid voltage zero-crossing detection circuit (4) comprises a voltage sampling circuit, a comparator U3, a resistor R8, a capacitor C6 and a triode Q20 which are connected in sequence,
the voltage sampling circuit is used for collecting the power grid voltage, the output end of the voltage sampling circuit is connected to the non-inverting input end of the comparator U3, the inverting input end of the comparator U3 is grounded, the output end of the comparator U3 is connected with the first end of the capacitor C6, the second end of the capacitor C6 is grounded through a resistor R8, the second end of the capacitor C6 is connected to the base electrode of the triode Q20, the emitting electrode of the triode Q20 is grounded, the collecting electrode of the triode Q20 is connected with a power supply 5V, the collecting electrode of the triode Q20 is grounded through a resistor R16, and the collecting electrode of the triode Q20 is used as the output of the power grid voltage zero-crossing circuit and is connected to the inverter controller.
5. The energy storage power station energy management system of claim 4, characterized in that the voltage sampling circuit comprises a resistor R12, a resistor R11, a resistor R9, a resistor R14 and a resistor R13 which are connected in series, wherein one end of the resistor R12 is connected with an L line of a power grid, one end of the resistor R13 is connected with an N line of the power grid, a first end of the resistor R9 is connected to a non-inverting input end of an operational amplifier U2, a second end of the resistor R9 is connected to an inverting input end of the operational amplifier U2, an output end of the operational amplifier U2 is connected to the non-inverting input end of the operational amplifier U2 through a resistor R17 in a feedback manner, and an output end of the operational amplifier U2 is used as an output of the voltage sampling circuit and is connected to the non-inverting input end of the comparator U3.
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