Energy storage aging system and method

Abstract

The application provides a kind of energy storage aging system and method, only need to input a voltage source, can realize the aging of simulating photovoltaic module and battery two parts design, can economically and efficiently reach the aging goal of energy storage equipment;System includes: for power supply DC voltage source, connect in the DC input end of energy storage inverter;Energy storage inverter includes BOOST boost module, BUCK / BOOST module, inverter module, the input of the BOOST boost module is connected with the DC voltage source, the output is connected after inverter module and connected to power grid, the BUCK / BOOST module is connected in parallel between the BOOST boost module;The BUCK / BOOST module includes BUCK step-down mode and BOOST boost mode;Drive module is connected with the energy storage inverter, for providing drive signal to complete the enable and prohibit operation of the BOOST boost module, BUCK / BOOST module, inverter module.

Description

Technical Field

[0001] This invention relates to the field of energy storage inverter aging technology, specifically to an energy storage aging system and method. Background Technology

[0002] Currently, the new energy industry is developing rapidly. In order to make rational use of energy and improve energy efficiency, energy storage systems are often installed. The working principle is that during the day, the energy storage inverter receives DC power generated by photovoltaic modules, converts it through the energy storage inverter, and supplies it to the load. Excess energy can also be stored in batteries through the energy storage inverter or fed into the grid through the energy storage inverter. At night, the energy storage inverter converts the energy stored in the battery and outputs it to supply the load, thus ensuring the user's use of green energy. For enterprise production, after the energy storage equipment is assembled, it needs to undergo automated testing and aging verification, which is an important part of production quality.

[0003] Generally, residential energy storage needs to consider the DC side of photovoltaics, the DC side of batteries, and the AC side. In the aging test, manufacturers of energy storage equipment usually need to purchase not only a DC voltage source to simulate photovoltaic modules, but also a bidirectional charging and discharging power supply to simulate battery charging and discharging. The AC side is usually fed into the grid for processing. In this way, the mutual conversion of energy from the DC side of photovoltaics, the battery side, and AC energy can complete the reliable aging verification of components in the energy storage equipment, including power devices, electronic circuits, inductors, capacitors, relays, etc. However, the above aging scheme requires the purchase of more than one type of power supply equipment, resulting in relatively high investment costs. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an energy storage aging system and method that requires only one voltage source input to simulate the aging of both photovoltaic modules and batteries, thus achieving the aging target of energy storage equipment economically and efficiently.

[0005] The technical solution is as follows: an energy storage aging system, characterized in that it includes:

[0006] The DC voltage source used for power supply is connected to the DC input terminal of the energy storage inverter;

[0007] An energy storage inverter includes a BOOST boost module, a BUCK / BOOST module, and an inverter module. The input terminal of the BOOST boost module is connected to the DC voltage source, and the output terminal is connected to the power grid via the inverter module. The BUCK / BOOST module is connected in parallel with the BOOST boost module.

[0008] The BUCK / BOOST module includes BUCK buck mode and BOOST boost mode;

[0009] The drive module, connected to the energy storage inverter, is used to provide drive signals to enable and disable the BOOST boost module, BUCK / BOOST module, and inverter module.

[0010] Furthermore, the BOOST boost module includes an inductor L1, a diode D1, a capacitor C1, and a switching transistor S_pv; the BUCK / BOOST module includes an inductor L2, a capacitor C2, a switching transistor S_buck, and a switching transistor S_boost; the inverter module includes switching transistors S1 to S6.

[0011] Furthermore, the drive module includes an ADC interrupt sampling processing unit, an interrupt loop control unit, and an interrupt modulation control unit connected in sequence, wherein the ADC interrupt sampling processing unit is connected to the energy storage inverter.

[0012] Used for real-time voltage and current sampling of the energy storage inverter;

[0013] The interrupt loop control unit is used to receive the sampled data from the ADC interrupt sampling processing module, process it, and then send real-time instructions to the interrupt modulation control module.

[0014] The interrupt modulation control unit is used to generate drive signals to drive the switching devices in the BOOST boost module, BUCK / BOOST module, and inverter module.

[0015] An energy storage aging method, characterized in that it includes:

[0016] The BOOST boost module, BUCK / BOOST module, and inverter module are enabled and disabled based on the input drive signal.

[0017] / or disable operation to simulate different power supply operating modes;

[0018] The different power supply operating modes include a mode that simulates photovoltaic modules charging batteries, a mode that simulates batteries discharging to the grid, and a mode that simulates photovoltaic modules discharging to the grid.

[0019] Specifically, when simulating the charging mode of a photovoltaic module to a battery, the BUCK / BOOST module operates in BUCK mode.

[0020] In buck mode, and when the inverter module is disabled, the BOOST boost module and the BUCK / BOOST module work in a closed loop to achieve the combined aging of the BOOST boost module and the BUCK / BOOST module in the energy storage inverter.

[0021] When simulating the battery discharging to the grid, the BUCK / BOOST module operates in BOOST boost mode, the inverter module operates, and the BOOST boost module is disabled, thereby realizing the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter;

[0022] When simulating the discharge mode of photovoltaic modules to the grid, both the BOOST boost module and the inverter module work, while the BUCK / BOOST module is disabled, thereby achieving the combined aging of the BOOST boost module and the inverter module in the energy storage inverter.

[0023] Furthermore, the energy storage aging method further includes the following steps:

[0024] S1. The energy storage inverter is powered on and starts up, receiving the aging command;

[0025] S2. Enter the simulated photovoltaic module charging mode for the battery, and then control the drive through the drive module to realize the combined aging of the BOOST boost module and BUCK / BOOST module in the energy storage inverter;

[0026] S3. After a set time, exit the combined aging mode of step S2 and enter the simulated battery discharge mode to the grid. Then, the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter is achieved by controlling the drive module.

[0027] S4. After a set time, exit the combined aging mode of step S3 and enter the simulated photovoltaic module discharge mode to the grid. Then, the combined aging of the BOOST boost module and the inverter module in the energy storage inverter is achieved by controlling the drive module.

[0028] S5, Aging complete and exit;

[0029] Further, in step S2, the interrupt modulation control unit in the drive module controls the output drive signal to turn off the switching transistors S1 to S6. The BUCK / BOOST module operates in BUCK buck mode to simulate battery charging, and at the same time enables the BOOST boost module 2 switching transistor S_pv. Then the BOOST boost module and the BUCK / BOOST module operate in a closed loop to realize the combined aging of the BOOST boost module and the BUCK / BOOST module in the energy storage inverter.

[0030] Furthermore, in step S3, after a set 3 hours of operation, the drive module exits the combined aging mode drive of step S2 and enters the simulated battery discharge mode to the grid. Then, the interrupt modulation control unit controls the output drive signal to turn on the switching transistors S1 to S6 and turn off the switching transistors S_pv and S_buck. The BUCK / BOOST module operates in BOOST boost mode, while simultaneously disabling the BOOST boost module 2 switching transistor S_pv. This achieves the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter.

[0031] Furthermore, in step S4, after a set 3 hours of operation, the drive module exits the combined aging mode drive of step S3 and enters the simulated photovoltaic module discharge mode to the grid. Then, the interrupt modulation control unit controls the output drive signal to turn on the switching transistors S1 to S6 and the switching transistor S_pv and turn off the switching transistors S_buck and S_boost. At the same time, the BOOST boost module 2 switching transistor S_pv is enabled, thus realizing the combined aging of the BOOST boost module and the inverter module in the energy storage inverter.

[0032] The beneficial effects of this invention are that, when the energy storage aging system is in operation, it only requires one DC voltage source to simulate both photovoltaic modules and batteries, achieving the aging test target economically and efficiently. Specifically, it realizes the combined aging of the BOOST boost module, BUCK / BOOST module, and inverter module in pairs, making full use of the energy storage inverter's own module circuit. There is no need to invest in additional hardware costs or design special wave generation logic for the drive module. Different combination aging can be achieved simply by enabling and disabling the relevant modules, which has good economic value. Attached Figure Description

[0033] Figure 1 This is a structural block diagram of the present invention;

[0034] Figure 2 This is the circuit schematic diagram of the present invention;

[0035] Figure 3 This is a structural block diagram of the driving module in this invention;

[0036] Figure 4 This is the aging logic flowchart of the present invention;

[0037] Figure 5 This is the structural circuit diagram of the first combined aging mode in this invention.

[0038] Figure 6 This is the circuit diagram of the first combined aging mode in this invention;

[0039] Figure 7 This is the structural circuit diagram of the second combined aging mode in this invention.

[0040] Figure 8 This is the circuit diagram of the second combined aging mode in this invention;

[0041] Figure 9 This is the structural circuit diagram of the third combined aging mode in this invention.

[0042] Figure 10 This is the circuit diagram of the third combined aging mode in this invention. Detailed Implementation

[0043] like Figures 1-10 As shown, an energy storage aging system includes:

[0044] DC voltage source 1, used for power supply, is connected to the DC input terminal of the energy storage inverter;

[0045] The energy storage inverter includes a BOOST boost module 2, a BUCK / BOOST module 3, and an inverter module 4. The input terminal of the BOOST boost module 2 is connected to the DC voltage source 1, and the output terminal is connected to the power grid 5 after being connected to the inverter module 4. The BUCK / BOOST module 3 and the BOOST boost module 2 are connected in parallel.

[0046] BUCK / BOOST module 3 includes BUCK buck mode and BOOST boost mode;

[0047] The drive module, connected to the energy storage inverter, is used to provide drive signals to enable and disable the BOOST boost module 2, BUCK / BOOST module 3, and inverter module 4.

[0048] The BOOST boost module 2 includes an inductor L1, a diode D1, a capacitor C1, and a switching transistor S_pv; the BUCK / BOOST module 3 includes an inductor L2, a capacitor C2, and switching transistors S_buck and S_boost; the inverter module 4 includes switching transistors S1 to S6.

[0049] The drive module includes an ADC interrupt sampling processing unit 6, an interrupt loop control unit 7, and an interrupt modulation control unit 8 connected in sequence. The ADC interrupt sampling processing unit 6 is connected to the energy storage inverter and is used to sample the voltage and current of the energy storage inverter in real time, specifically the voltage and current on the DC side of the energy storage inverter, the voltage and current on the inverter output side, the bus voltage, and the voltage and current of the DC voltage source 1.

[0050] Interrupt loop control unit 7 is used to receive the sampled data from the ADC interrupt sampling processing module, process it, and then send the real-time command to the interrupt modulation control module.

[0051] Interrupt modulation control unit 8 is used to generate drive signals to drive the switching devices in BOOST boost module 2, BUCK / BOOST module 3 and inverter module 4; specifically, it can generate PWM drive signals for driving switching transistors S_pv, S_buck and S_boost and SPWM drive signals for driving switching transistors S1 to S6 respectively.

[0052] like Figure 4 As shown, an energy storage aging method enables and / or disables the BOOST boost module 2, BUCK / BOOST module 3, and inverter module 4 based on the input drive signal to simulate different power supply operating modes.

[0053] Different power supply operating modes include simulating photovoltaic module charging the battery, simulating battery discharging to the grid, and simulating photovoltaic module discharging to the grid.

[0054] Specifically, it includes the following steps:

[0055] S1. The energy storage inverter is powered on and starts aging after receiving the aging command.

[0056] S2. The drive module starts the combined aging of BOOST boost module 2 and BUCK / BOOST module 3 by default, that is, it enters the mode of simulating photovoltaic modules charging batteries, and then controls the drive through the drive to realize the combined aging of BOOST boost module 2 and BUCK / BOOST module 3 in the energy storage inverter.

[0057] Specifically, such as Figure 5 , Figure 6 As shown, the interrupt modulation control unit 8 in the drive module controls the output drive signal to turn off the switching transistors S1 to S6 to disable the inverter module 4 from working. The BUCK / BOOST module 3 works in BUCK buck mode to realize simulated battery charging. At the same time, the switching transistor S_pv in the BOOST boost module 2 is enabled. Then the BOOST boost module 2 and BUCK / BOOST module 3 work in a closed loop to realize the combined aging of the BOOST boost module 2 and BUCK / BOOST module 3 in the energy storage inverter.

[0058] Figure 6 The switching transistor S_boost can be set to work or not according to the actual situation. In this embodiment, when the BUCK / BOOST module 3 works in BUCK buck mode, both the switching transistor S_buck and the switching transistor S_boost are turned on.

[0059] S3. After 3 hours, exit the combined aging mode of step S2 and enter the simulated battery discharge mode to the grid 5. Then, the combined aging of the BUCK / BOOST module 3 and the inverter module 4 in the energy storage inverter is achieved by controlling the drive module.

[0060] Specifically, such as Figure 7 , Figure 8 As shown, after a set 3 hours of operation, the drive module exits the combined aging mode drive in step S2 and enters the simulated battery discharge mode to the grid 5. Then, the interrupted modulation control unit 8 controls the output drive signal to turn on the switching transistors S1 to S6 and turn off the switching transistors S_pv and S_buck. The inverter module 4 works, the BOOST boost module 2 is disabled, the BUCK / BOOST module 3 works in BOOST boost mode, and the switching transistor S_pv in the BOOST boost module 2 is disabled. Thus, the combined aging of the BUCK / BOOST module 3 and the inverter module 4 in the energy storage inverter is realized.

[0061] S4. After 3 hours, exit the combined aging mode of step S3 and enter the simulated photovoltaic module to discharge to the grid 5 mode. Then, the combined aging of BOOST boost module 2 and inverter module 4 in the energy storage inverter is realized by controlling the drive module.

[0062] Specifically, such as Figure 9 , Figure 10 As shown, after a set 3 hours of operation, the drive module exits the combined aging mode drive of step S3 and enters the simulated photovoltaic module discharge mode to the grid 5. Then, the interrupt modulation control unit 8 controls the output drive signal to turn on the switching transistors S1 to S6 and the switching transistor S_pv and turn off the switching transistors S_buck and S_boost. Both the BOOST boost module 2 and the inverter module 4 work, the BUCK / BOOST module 3 is disabled, and the switching transistor S_pv in the BOOST boost module 2 is enabled. Thus, the combined aging of the BOOST boost module 2 and the inverter module 4 in the energy storage inverter is realized.

[0063] S5, Aging complete and exit.

[0064] This invention can simulate the aging of both photovoltaic and battery designs when only one DC voltage source 1 is input. It also achieves energy conversion through the combination of BOOST boost module 2 and BUCK / BOOST module 3, the combination of BUCK / BOOST module 3 and inverter module 4, and the combination of BOOST boost module 2 and inverter module 4. Specifically, the combination of BOOST boost module 2 and BUCK / BOOST module 3 simulates the charging of the battery by the photovoltaic module; the combination of BUCK / BOOST module 3 and inverter module 4 simulates the discharging of the battery to the grid 5; and the combination of BOOST boost module 2 and inverter module 4 simulates the discharging of the photovoltaic module to the grid 5.

[0065] The advantages of this invention are:

[0066] (1) The operation is very simple: Connect the positive and negative terminals of BOOST boost module 2 and BUCK / BOOST module 3 to the positive and negative terminals of DC voltage source 1 respectively on the DC side of the energy storage inverter, and connect the AC side directly to the power grid 5. No other wiring operations are required for the system to complete the system aging wiring operation.

[0067] (2) No additional hardware cost: Fully utilizes the circuit modules of the energy storage inverter itself, without the need to add additional circuit costs;

[0068] (3) Simple software control: No special wave generation logic is required for the drive module design. All mode combinations make full use of the existing normal loop control of the functional module itself. Only the enable and disable operations of the relevant functional modules are required to realize the aging of different combinations. It can ensure the consistency of the aging method and the actual application of the energy storage inverter. The aging verification results are true and reliable.

[0069] In summary, the unique aging method of the energy storage system of the present invention can achieve full-load aging of multiple circuit modules, and the present invention can be applied in the energy field of energy storage inverters.

[0070] Figure 2 In this circuit, capacitors C3 and C4, and inductors L3 and L4 are all connected as output filters.

[0071] "load" refers to the load; "Vac" refers to the inverter output voltage; and "DC source" is the English description of a DC voltage source.

[0072] Figures 5-10 In the text, the gray text indicates that it is not working.

[0073] The embodiments of this invention use BUCK / BOOST as an example, but this also applies to LLC topologies;

[0074] Inverter module 4 (i.e., DC-AC conversion module) takes Heric as an example, including but not limited to other circuit topologies such as H5, H6, and T-NPC.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy storage aging method, characterized in that: One type of energy storage aging system it employs includes: The DC voltage source used for power supply is connected to the DC input terminal of the energy storage inverter; An energy storage inverter includes a BOOST boost module, a BUCK / BOOST module, and an inverter module. The input terminal of the BOOST boost module is connected to the DC voltage source, and the output terminal is connected to the power grid via the inverter module. The BUCK / BOOST module is connected in parallel with the BOOST boost module. The BUCK / BOOST module includes BUCK buck mode and BOOST boost mode; The drive module, connected to the energy storage inverter, is used to provide drive signals to enable and disable the BOOST boost module, BUCK / BOOST module, and inverter module. The aging method includes: The BOOST boost module, BUCK / BOOST module, and inverter module are enabled and / or disabled based on the input drive signal to simulate different power supply operating modes. The different power supply operating modes include a mode that simulates photovoltaic modules charging batteries, a mode that simulates batteries discharging to the grid, and a mode that simulates photovoltaic modules discharging to the grid. When simulating the charging mode of the photovoltaic module to the battery, the BUCK / BOOST module works in BUCK step-down mode and the inverter module is prohibited from working. Then, the BOOST boost module and the BUCK / BOOST module work in a closed loop to realize the combined aging of the BOOST boost module and the BUCK / BOOST module in the energy storage inverter. When simulating the battery discharging to the grid, the BUCK / BOOST module operates in BOOST boost mode, the inverter module operates, and the BOOST boost module is disabled, thereby realizing the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter; When simulating the discharge mode of photovoltaic modules to the grid, both the BOOST boost module and the inverter module work, while the BUCK / BOOST module is disabled, thereby achieving the combined aging of the BOOST boost module and the inverter module in the energy storage inverter.

2. The energy storage aging method according to claim 1, characterized in that, The BOOST boost module includes an inductor L1, a diode D1, a capacitor C1, and a switching transistor S_pv; the BUCK / BOOST module includes an inductor L2, a capacitor C2, and switching transistors S_buck and S_boost; the inverter module includes switching transistors S1 to S6.

3. The energy storage aging method according to claim 2, characterized in that, The drive module includes an ADC interrupt sampling processing unit, an interrupt loop control unit, and an interrupt modulation control unit connected in sequence. The ADC interrupt sampling processing unit is connected to the energy storage inverter and is used to sample the voltage and current of the energy storage inverter in real time. The interrupt loop control unit is used to receive the sampled data from the ADC interrupt sampling processing unit, process it, and then send real-time instructions to the interrupt modulation control unit. The interrupt modulation control unit is used to generate drive signals to drive the switching devices in the BOOST boost module, BUCK / BOOST module, and inverter module.

4. The energy storage aging method according to claim 1, characterized in that: The energy storage aging method further includes the following steps: S1. The energy storage inverter is powered on and starts up, receiving the aging command; S2. Enter the simulated photovoltaic module charging mode for the battery, and then control the drive through the drive module to realize the combined aging of the BOOST boost module and BUCK / BOOST module in the energy storage inverter; S3. After a set time, exit the combined aging mode of step S2 and enter the simulated battery discharge mode to the grid. Then, the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter is achieved by controlling the drive module. S4. After a set time, exit the combined aging mode of step S3 and enter the simulated photovoltaic module discharge mode to the grid. Then, the combined aging of the BOOST boost module and the inverter module in the energy storage inverter is achieved by controlling the drive module. S5, Aging complete and exit.

5. The energy storage aging method according to claim 3, characterized in that: In step S2, the interrupt modulation control unit in the drive module controls the output drive signal to turn off the switching transistors S1~S6. The BUCK / BOOST module operates in BUCK buck mode to simulate battery charging. At the same time, the switching transistor S_pv in the BOOST boost module is enabled. Then, the BOOST boost module and the BUCK / BOOST module operate in a closed loop to realize the combined aging of the BOOST boost module and the BUCK / BOOST module in the energy storage inverter.

6. The energy storage aging method according to claim 3, characterized in that: In step S3, after a set 3 hours of operation, the drive module exits the combined aging mode drive of step S2 and enters the simulated battery discharge mode to the grid. Then, the interrupt modulation control unit controls the output drive signal to turn on the switching transistors S1~S6 and turn off the switching transistors S_pv and S_buck. The BUCK / BOOST module operates in BOOST boost mode, while the switching transistor S_pv in the BOOST boost module is disabled, thus realizing the combined aging of the BUCK / BOOST module and the inverter module in the energy storage inverter.

7. The energy storage aging method according to claim 3, characterized in that: In step S4, after a set 3 hours of operation, the drive module exits the combined aging mode drive of step S3 and enters the simulated photovoltaic module discharge mode to the grid. Then, the interrupt modulation control unit controls the output drive signal to turn on the switching transistors S1~S6 and S_pv and turn off the switching transistors S_buck and S_boost. At the same time, the switch S_pv in the BOOST boost module is enabled, thus realizing the combined aging of the BOOST boost module and the inverter module in the energy storage inverter.

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