Direct current side coupling energy storage system of inverter

Abstract

The utility model discloses a direct current side coupling energy storage system of an inverter. Comprising a direct current side circuit used for providing or storing direct current, an inverter circuit used for converting the direct current into alternating current, a filter circuit used for filtering alternating current signals output by a filter, a charging and discharging control circuit used for managing the charging and discharging process of energy storage equipment, and a power distribution circuit used for adjusting the flow direction of the current. The constant-current charging circuit can dynamically adjust output voltage, maintain constant charging current, better adapt to requirements of the battery in different charging states, effectively avoid over-charging or under-charging and prolong the service life of the battery, and the power distribution circuit can distribute electric energy to occasions of a plurality of parts or systems so as to realize effective management and distribution of energy. The flow direction of the electric energy is adjusted, so that the electric energy can flexibly flow and be distributed among different parts or systems, the energy utilization efficiency of the system is optimized, the energy loss is reduced, and the performance of the whole system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, in particular to an inverter DC side coupled energy storage system. Background Art

[0002] An energy storage system is a device that can convert electrical energy into other forms of energy for storage, and convert the energy back into electrical energy for output when needed. Energy storage systems play an important role in power systems, improving energy efficiency, balancing power supply and demand, and providing backup power. The inverter DC-side coupled energy storage system is a system that converts DC power into AC power through an inverter and is combined with an energy storage system. It usually includes components such as inverters, energy storage devices (such as batteries), and control systems.

[0003] After searching, the patent with application number CN202122869458.9 discloses an inverter DC side coupled energy storage system, including a photovoltaic inverter, several groups of photovoltaic modules, a DC converter and an energy storage battery cluster, a DC junction box, an auxiliary transformer, and a distribution system. One end of the photovoltaic inverter is connected to the grid through a busbar, and the other end is respectively connected to the photovoltaic modules and the DC converter. The distribution system is connected to the busbar through an auxiliary transformer to supply power to the photovoltaic inverter and the DC converter. At least two groups of photovoltaic modules are connected to the photovoltaic inverter through the same DC junction box, and each DC converter is connected to a group of energy storage battery clusters. Since the DC side coupled energy storage system is connected to the grid through the DC side of the photovoltaic inverter, it only needs to configure a DC converter of the corresponding voltage level on the DC side of the photovoltaic inverter. Compared with the AC side coupled energy storage system, the transformer can be omitted, and the overall efficiency is significantly improved. For high capacity ratio photovoltaic systems, the number of photovoltaic inverter configurations can be reduced, which greatly reduces the system cost.

[0004] The current inverter DC-side coupled energy storage system mostly uses a non-constant current method when charging, which can easily lead to overcharging or undercharging, and requires the addition of a charging protection circuit, which increases the system cost. In addition, the current energy storage system cannot achieve accurate and reasonable distribution and management of electric energy, and the electric energy loss is large and the utilization rate is low. Therefore, we need to propose an inverter DC-side coupled energy storage system. Utility Model Content

[0005] The purpose of the utility model is to provide an inverter DC side coupled energy storage system. Through the design of the charge and discharge control circuit and the power distribution circuit, the constant current charging circuit can dynamically adjust the output voltage and maintain a constant charging current, which can better adapt to the needs of the battery under different charging states, effectively avoid overcharging or undercharging, and extend the service life of the battery. The power distribution circuit can distribute electric energy to multiple components or systems to achieve effective management and distribution of energy, adjust the flow of electric energy, so that electric energy can flow and distribute flexibly between different components or systems, optimize the energy utilization efficiency of the system, reduce energy loss, and improve the performance of the entire system to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an inverter DC side coupled energy storage system, comprising a DC side circuit for providing or storing DC power, an inverter circuit for converting DC power into AC power, a filter circuit for filtering the AC power signal output by the filter, a charge and discharge control circuit for managing the charging and discharging process of the energy storage device, and a power distribution circuit for adjusting the current flow direction;

[0007] The DC side circuit includes a solar photovoltaic panel that can convert solar energy into DC electric energy and a lithium battery for storing electric energy. The charge and discharge control circuit includes a constant current charging circuit and a discharge circuit.

[0008] Preferably, the DC side circuit also includes a chip IC1, resistors R1 and R2 are connected between pin 1 and pin 2 of the chip IC1, capacitor C1 is connected between pin 3 and pin 5 of the chip IC1, a diode D1 and a transistor Q1 are connected to the solar photovoltaic panel, the diode D1 is connected to the resistor R1, and both ends of the resistor R2 are respectively connected to the emitter and collector of the transistor Q1.

[0009] Preferably, a light emitting diode LED and a diode D2 are connected between pins 1 and 5 of the chip IC1, an inductor L and a capacitor C2 are connected between pins 3 and 4 of the chip IC1, and the diode D2 and the inductor L are respectively connected to two ends of the lithium battery.

[0010] Preferably, the inverter circuit includes an amplifier U9A, an amplifier U9B and an amplifier U22 connected in sequence, a capacitor C41 is connected between pins 3 and 8 of the amplifier U9A, and pin 2 of the amplifier U9A is respectively connected to resistors R31 and R27 connected in series, resistors R30 and R28 connected in series, and capacitors C22 and R29 connected in series, the resistor R28 is connected to resistor R29, and grounded capacitors C20 and C21 are connected in series between the wiring terminals of the resistors R31 and R27 and the wiring terminals of the resistors R30 and R28.

[0011] Preferably, resistor R32 and resistor R34 are connected between pin 1 of the amplifier U9A and pin 6 of the amplifier U9B, an adjustable resistor RW4 is connected between pin 1 and pin 2 of the amplifier U9A, an adjustable resistor RW5 is connected between pin 6 and pin 7 of the amplifier U9B, a resistor R36 is connected between pin 7 of the amplifier U9B and pin 2 of the amplifier U22, a capacitor C25 is connected to pin 3 of the amplifier U22, a resistor R37 and a capacitor C44 are connected between pin 3 and pin 4 of the amplifier U22, and a resistor R38 is connected to pin 7 of the amplifier U22.

[0012] Preferably, the filtering circuit includes an amplifier U221A, a capacitor C2123 is connected between pin 1 and pin 5 of the amplifier U221A, a resistor R2146, a resistor R2147 and a resistor R2154 are sequentially connected to pin 5 of the amplifier U221A, a capacitor C2124 and a capacitor C2135 are respectively connected to pin 3 of the amplifier U221A, the capacitor C2124 is connected between the resistor R2146 and the resistor R2147, and the capacitor C2135 is connected between the resistor R2147 and the resistor R2154.

[0013] Preferably, the charge and discharge control circuit includes a constant current charging circuit and a discharge circuit, the constant current charging circuit includes a voltage stabilizing chip IC2, a terminal JP1 and a terminal JP2, a rectifier D10 is connected between pins 1 and 2 of the terminal JP1, a transistor Q10 is connected to pin 3 of the voltage stabilizing chip IC2, a diode D20 and a resistor R10 are connected between the base and emitter of the transistor Q10, the resistor R10 is connected to pin 4 of the rectifier D10, and both ends of the diode D20 are respectively connected to a grounded resistor R20 and a capacitor C10;

[0014] A diode D30 is connected between pin 2 of the voltage regulator chip IC2 and pin 1 of the terminal JP2, a resistor R40 is connected between pin 1 and pin 2 of the voltage regulator chip IC2, one end of the resistor R40 is connected to a resistor R50, one end of the resistor R50 is connected to a resistor R30 and a resistor R60 arranged in parallel, and one end of the resistor R30 and the resistor R60 are respectively connected to the resistor R20 and pin 2 of the terminal JP2.

[0015] Preferably, the discharge circuit includes a transistor Q111, a transistor Q222 and a transistor Q333, a resistor R111 is connected between the base and the collector of the transistor Q111, a voltage-stabilizing diode D222 is connected between the base of the transistor Q111 and the base of the transistor Q333, a diode D111 and a resistor R222 are connected to the collector of the transistor Q222, and a resistor R333 connected to the collector of the transistor Q111 is connected to the base of the transistor Q222.

[0016] Preferably, the power distribution circuit includes an inductor L1, a coil T1 and a coil T2, a capacitor C27 is connected between the coil T1 and the coil T2, a capacitor C77 is connected in parallel to the inductor L1, a resistor R17 and a capacitor C37 are connected in series to one end of the inductor L1, a resistor R27 and a capacitor C57 are connected in series to the other end of the inductor L1, one end of the capacitor C37 is connected to a capacitor C87, one end of the capacitor C57 is connected to a capacitor C67, the two ends of the coil T2 are respectively connected to the capacitor C37 and the capacitor C57, and one end of the coil T1 is connected to the capacitor C17.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model adopts the design of the charge and discharge control circuit and the power distribution circuit. The constant current charging circuit can dynamically adjust the output voltage and maintain a constant charging current, which can better adapt to the needs of the battery under different charging states, effectively avoid overcharging or undercharging, and extend the service life of the battery. The power distribution circuit can distribute electric energy to multiple components or systems to achieve effective management and distribution of energy, adjust the flow of electric energy, so that the electric energy can flow and be distributed flexibly between different components or systems, optimize the energy utilization efficiency of the system, reduce energy loss, and improve the performance of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a circuit diagram of the DC side circuit of the utility model;

[0020] Figure 2 The circuit diagram of the inverter circuit of the utility model;

[0021] Figure 3 The circuit diagram of the filter circuit of the utility model;

[0022] Figure 4 It is a circuit diagram of the constant current charging circuit of the utility model;

[0023] Figure 5 The circuit diagram of the discharge circuit of the utility model;

[0024] Figure 6The utility model is a circuit diagram of a power distribution circuit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-6 The utility model provides a technical solution: an inverter DC side coupled energy storage system, including a DC side circuit for providing or storing DC power, an inverter circuit for converting DC power into AC power, a filter circuit for filtering the AC power signal output by the filter, a charge and discharge control circuit for managing the charging and discharging process of the energy storage device, and a power distribution circuit for adjusting the current flow direction; the filter circuit can also eliminate electromagnetic interference and improve the quality of output electric energy. The power distribution circuit automatically adjusts the energy flow to different components and distributes the input electric energy to different output channels to meet the needs of each component for electric energy, so that the electric energy can flow and be distributed flexibly between different components or systems. When a component or system needs to limit the input of electric energy, the power distributor can adjust the electric energy distribution according to the demand to ensure the safe and stable operation of the system.

[0027] The DC side circuit includes a solar photovoltaic panel that can convert solar energy into DC power, a lithium battery for storing electrical energy, and the charge and discharge control circuit includes a constant current charging circuit and a discharge circuit. In the constant current charging circuit, by real-time monitoring of the battery's voltage, temperature, charging rate and other parameters, the output voltage can be dynamically adjusted to maintain a constant charging current. Specifically, when the battery's charging voltage increases, the system will automatically reduce the output voltage to maintain a constant charging current; conversely, when the battery's charging voltage decreases, the system will increase the output voltage and also maintain a constant charging current. In this way, the constant current charging circuit can better adapt to the needs of the battery under different charging states, effectively avoid overcharging or undercharging, and extend the battery's service life.

[0028] The DC side circuit also includes a chip IC1, resistors R1 and R2 are connected between pin 1 and pin 2 of the chip IC1, capacitor C1 is connected between pin 3 and pin 5 of the chip IC1, a diode D1 and a transistor Q1 are connected to the solar photovoltaic panel, the diode D1 is connected to the resistor R1, and both ends of the resistor R2 are respectively connected to the emitter and collector of the transistor Q1.

[0029] A light emitting diode LED and a diode D2 are connected between pins 1 and 5 of the chip IC1, an inductor L and a capacitor C2 are connected between pins 3 and 4 of the chip IC1, and the diode D2 and the inductor L are connected to two ends of the lithium battery, respectively.

[0030] The inverter circuit includes an amplifier U9A, an amplifier U9B and an amplifier U22 connected in sequence, a capacitor C41 is connected between pins 3 and 8 of the amplifier U9A, and pin 2 of the amplifier U9A is respectively connected with resistors R31 and R27 connected in series, resistors R30 and R28 connected in series, and capacitors C22 and R29 connected in series, the resistor R28 is connected to resistor R29, and grounded capacitors C20 and C21 are connected in series between the connection terminals of the resistors R31 and R27 and the connection terminals of the resistors R30 and R28.

[0031] Resistors R32 and R34 are connected between pin 1 of the amplifier U9A and pin 6 of the amplifier U9B, an adjustable resistor RW4 is connected between pin 1 and pin 2 of the amplifier U9A, an adjustable resistor RW5 is connected between pin 6 and pin 7 of the amplifier U9B, a resistor R36 is connected between pin 7 of the amplifier U9B and pin 2 of the amplifier U22, a capacitor C25 is connected to pin 3 of the amplifier U22, a resistor R37 and a capacitor C44 are connected between pin 3 and pin 4 of the amplifier U22, and a resistor R38 is connected to pin 7 of the amplifier U22.

[0032] Resistors R35 and R33 are also connected to pin 6 of amplifier U9B, grounded capacitors C24 and C23 are connected between the connection terminals of resistors R32 and R34 and the connection terminals of resistors R35 and R33, and one end of resistor R33 is connected to oil well resistor R339.

[0033] The filter circuit includes an amplifier U221A, a capacitor C2123 is connected between pin 1 and pin 5 of the amplifier U221A, a resistor R2146, a resistor R2147 and a resistor R2154 are sequentially connected to pin 5 of the amplifier U221A, a capacitor C2124 and a capacitor C2135 are respectively connected to pin 3 of the amplifier U221A, the capacitor C2124 is connected between the resistor R2146 and the resistor R2147, and the capacitor C2135 is connected between the resistor R2147 and the resistor R2154. One end of the capacitor C2123 is connected to the resistor R2145, and one end of the resistor R2145 is connected to the connection terminals of the resistor R2146, the resistor R2147 and the capacitor C2124.

[0034] The charge and discharge control circuit includes a constant current charging circuit and a discharge circuit, the constant current charging circuit includes a voltage stabilizing chip IC2, a terminal JP1 and a terminal JP2, a rectifier D10 is connected between pins 1 and 2 of the terminal JP1, a transistor Q10 is connected to pin 3 of the voltage stabilizing chip IC2, a diode D20 and a resistor R10 are connected between the base and emitter of the transistor Q10, the resistor R10 is connected to pin 4 of the rectifier D10, and both ends of the diode D20 are respectively connected to a grounded resistor R20 and a capacitor C10;

[0035] A diode D30 is connected between pin 2 of the voltage regulator chip IC2 and pin 1 of the terminal JP2, a resistor R40 is connected between pin 1 and pin 2 of the voltage regulator chip IC2, one end of the resistor R40 is connected to a resistor R50, one end of the resistor R50 is connected to a resistor R30 and a resistor R60 arranged in parallel, and one end of the resistor R30 and the resistor R60 are respectively connected to the resistor R20 and pin 2 of the terminal JP2.

[0036] The discharge circuit includes a transistor Q111, a transistor Q222 and a transistor Q333, a resistor R111 is connected between the base and the collector of the transistor Q111, a voltage-stabilizing diode D222 is connected between the base of the transistor Q111 and the base of the transistor Q333, a diode D111 and a resistor R222 are connected to the collector of the transistor Q222, and a resistor R333 connected to the collector of the transistor Q111 is connected to the base of the transistor Q222.

[0037] The power distribution circuit includes an inductor L1, a coil T1 and a coil T2, a capacitor C27 is connected between the coil T1 and the coil T2, a capacitor C77 is connected in parallel to the inductor L1, a resistor R17 and a capacitor C37 are connected in series to one end of the inductor L1, a resistor R27 and a capacitor C57 are connected in series to the other end of the inductor L1, one end of the capacitor C37 is connected to a capacitor C87, one end of the capacitor C57 is connected to a capacitor C67, two ends of the coil T2 are respectively connected to the capacitor C37 and the capacitor C57, and one end of the coil T1 is connected to the capacitor C17.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An inverter DC side coupled energy storage system, characterized in that: It includes a DC side circuit for providing or storing DC power, an inverter circuit for converting DC power into AC power, a filter circuit for filtering the AC power signal output by the filter, a charge and discharge control circuit for managing the charging and discharging process of the energy storage device, and a power distribution circuit for adjusting the direction of current flow; The DC side circuit includes a solar photovoltaic panel that can convert solar energy into DC electric energy and a lithium battery for storing electric energy. The charge and discharge control circuit includes a constant current charging circuit and a discharge circuit.

2. The inverter DC-side coupled energy storage system according to claim 1, characterized in that: The DC side circuit also includes a chip IC1, resistors R1 and R2 are connected between pin 1 and pin 2 of the chip IC1, capacitor C1 is connected between pin 3 and pin 5 of the chip IC1, a diode D1 and a transistor Q1 are connected to the solar photovoltaic panel, the diode D1 is connected to the resistor R1, and both ends of the resistor R2 are respectively connected to the emitter and collector of the transistor Q1.

3. The inverter DC-side coupled energy storage system according to claim 2, characterized in that: A light emitting diode LED and a diode D2 are connected between pins 1 and 5 of the chip IC1, an inductor L and a capacitor C2 are connected between pins 3 and 4 of the chip IC1, and the diode D2 and the inductor L are connected to two ends of the lithium battery, respectively.

4. The inverter DC-side coupled energy storage system according to claim 1, characterized in that: The inverter circuit includes an amplifier U9A, an amplifier U9B and an amplifier U22 connected in sequence, a capacitor C41 is connected between pins 3 and 8 of the amplifier U9A, and pin 2 of the amplifier U9A is respectively connected with resistors R31 and R27 connected in series, resistors R30 and R28 connected in series, and capacitors C22 and R29 connected in series, the resistor R28 is connected to resistor R29, and grounded capacitors C20 and C21 are connected in series between the connection terminals of the resistors R31 and R27 and the connection terminals of the resistors R30 and R28.

5. The inverter DC-side coupled energy storage system according to claim 4, characterized in that: Resistors R32 and R34 are connected between pin 1 of the amplifier U9A and pin 6 of the amplifier U9B, an adjustable resistor RW4 is connected between pin 1 and pin 2 of the amplifier U9A, an adjustable resistor RW5 is connected between pin 6 and pin 7 of the amplifier U9B, a resistor R36 is connected between pin 7 of the amplifier U9B and pin 2 of the amplifier U22, a capacitor C25 is connected to pin 3 of the amplifier U22, a resistor R37 and a capacitor C44 are connected between pin 3 and pin 4 of the amplifier U22, and a resistor R38 is connected to pin 7 of the amplifier U22.

6. The inverter DC-side coupled energy storage system according to claim 1, characterized in that: The filtering circuit includes an amplifier U221A, a capacitor C2123 is connected between pin 1 and pin 5 of the amplifier U221A, a resistor R2146, a resistor R2147 and a resistor R2154 are connected to pin 5 of the amplifier U221A in sequence, a capacitor C2124 and a capacitor C2135 are connected to pin 3 of the amplifier U221A respectively, the capacitor C2124 is connected between the resistor R2146 and the resistor R2147, and the capacitor C2135 is connected between the resistor R2147 and the resistor R2154.

7. The inverter DC-side coupled energy storage system according to claim 1, characterized in that: The charge and discharge control circuit includes a constant current charging circuit and a discharge circuit, the constant current charging circuit includes a voltage stabilizing chip IC2, a terminal JP1 and a terminal JP2, a rectifier D10 is connected between pins 1 and 2 of the terminal JP1, a transistor Q10 is connected to pin 3 of the voltage stabilizing chip IC2, a diode D20 and a resistor R10 are connected between the base and emitter of the transistor Q10, the resistor R10 is connected to pin 4 of the rectifier D10, and both ends of the diode D20 are respectively connected to a grounded resistor R20 and a capacitor C10; A diode D30 is connected between pin 2 of the voltage regulator chip IC2 and pin 1 of the terminal JP2, a resistor R40 is connected between pin 1 and pin 2 of the voltage regulator chip IC2, one end of the resistor R40 is connected to a resistor R50, one end of the resistor R50 is connected to a resistor R30 and a resistor R60 arranged in parallel, and one end of the resistor R30 and the resistor R60 are respectively connected to the resistor R20 and pin 2 of the terminal JP2.

8. The inverter DC-side coupled energy storage system according to claim 7, characterized in that: The discharge circuit includes a transistor Q111, a transistor Q222 and a transistor Q333, a resistor R111 is connected between the base and the collector of the transistor Q111, a voltage-stabilizing diode D222 is connected between the base of the transistor Q111 and the base of the transistor Q333, a diode D111 and a resistor R222 are connected to the collector of the transistor Q222, and a resistor R333 connected to the collector of the transistor Q111 is connected to the base of the transistor Q222.

9. The inverter DC-side coupled energy storage system according to claim 1, characterized in that: The power distribution circuit includes an inductor L1, a coil T1 and a coil T2, a capacitor C27 is connected between the coil T1 and the coil T2, a capacitor C77 is connected in parallel to the inductor L1, a resistor R17 and a capacitor C37 are connected in series to one end of the inductor L1, a resistor R27 and a capacitor C57 are connected in series to the other end of the inductor L1, one end of the capacitor C37 is connected to a capacitor C87, one end of the capacitor C57 is connected to a capacitor C67, two ends of the coil T2 are respectively connected to the capacitor C37 and the capacitor C57, and one end of the coil T1 is connected to the capacitor C17.

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