System suitable for power management in energy storage converter

Abstract

The utility model provides a system suitable for power management in an energy storage converter. The system comprises an AC power supply unit, an energy storage power supply unit and the energy storage converter. The energy storage converter at least comprises an energy storage alternating current control switch, an energy storage electric energy conversion unit, a converter internal power supply unit and an energy storage alternating current control module, the alternating current power supply unit is connected with the energy storage electric energy conversion unit through the energy storage alternating current control switch, and the energy storage electric energy conversion unit is connected with the energy storage power supply unit. The converter internal power supply unit comprises an independent power supply module and an isolation power supply module which are different in power supply power, the independent power supply module at least supplies power to the energy storage alternating current control switch, and the isolation power supply module is used for supplying power to the energy storage alternating current control module and the energy storage electric energy conversion unit. The independent power supply module and the isolation power supply module take power from the AC power supply unit and / or the energy storage power supply unit. The energy storage AC control module is connected with the energy storage AC control switch and the energy storage electric energy conversion unit to control the working states of the two. The system is stable and reliable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power electronics, and relates to a system suitable for power management in a power conversion system. BACKGROUND

[0002] A power conversion system (PCS) is a bidirectional conversion power electronic device that can convert electric energy from one form to another, and is usually located between a power storage battery system and a power grid to realize bidirectional current controllable conversion of the power storage battery system and the power grid, and can accurately and quickly adjust voltage, frequency and power supply power between the power grid and the power storage system, realize constant power supply power constant current charging and discharging, and smooth fluctuating power output.

[0003] Electronic elements such as DC fuses, contactors and current Hall sensors, and functional modules such as driving modules and control modules are usually configured in the power conversion system module, and working state monitoring, control processing, communication and other functional circuits are also provided to improve the safety and stability of the power storage system. The internal structure of the power conversion system module is numerous, and how to realize the conversion of high-voltage wide input of the power conversion system module into the voltage required by each structure inside the power conversion system module is crucial to ensure the stable and reliable work of the large power supply power conversion system module.

[0004] Therefore, how to provide a system suitable for power management in a power conversion system to realize stable and reliable work of the power conversion system has become an important technical problem to be solved by the person skilled in the art.

[0005] It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the application, and to facilitate the understanding of the person skilled in the art. The above technical scheme cannot be considered as known to the person skilled in the art only because it is described in the background section of the application. CONTENT OF THE INVENTION

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a system suitable for power management in a power conversion system to realize stable and reliable work of the system suitable for power management in a power conversion system.

[0007] To achieve the above object and other related objects, the present application provides a system suitable for power management in a power conversion system, comprising an alternating current power supply unit, a power storage power supply unit and a power conversion system, wherein,

[0008] The energy storage converter comprises at least an energy storage AC control switch, an energy storage power conversion unit, an internal power supply unit of the converter, and an energy storage AC control module, the AC power supply unit is adaptively connected with the energy storage power conversion unit through the energy storage AC control switch, and the energy storage power conversion unit is adaptively connected with the energy storage power supply unit;

[0009] The internal power supply unit of the converter comprises independent power supply modules with different power supply powers and an isolation power supply module, wherein the independent power supply modules at least supply power to the energy storage AC control switch, and the isolation power supply module at least supplies power to the energy storage AC control module and the energy storage power conversion unit;

[0010] The independent power supply modules and the isolation power supply module take power from the AC power supply unit and / or the energy storage power supply unit;

[0011] The energy storage AC control module is adaptively connected with the energy storage AC control switch and the energy storage power conversion unit to control the working states of the energy storage AC control switch and the energy storage power conversion unit.

[0012] Optionally, the energy storage converter further comprises a power supply conversion module, the power supply conversion module comprises a rectifier circuit and a filter circuit, wherein the AC power supply unit, the rectifier circuit and the filter circuit are sequentially connected, and the energy storage power supply unit is also connected with the filter circuit, the rectifier circuit is used to convert AC input by the AC power supply unit into DC and then output, and the filter circuit is used to filter DC voltage input by the rectifier circuit and / or the energy storage power supply unit and then output.

[0013] Optionally, the voltage output by the power supply conversion module is less than or equal to 1500V, the AC power supply unit comprises a three-phase AC power supply unit, and the rectifier circuit comprises a three-phase rectifier bridge.

[0014] Optionally, the system suitable for power management in the energy storage converter further comprises a power taking fuse and an output end common mode filter inductor, the power taking fuse and the output end common mode filter inductor are located between the power supply conversion module and the isolation power supply module.

[0015] Optionally, the system suitable for power management in the energy storage converter further comprises a power supply selection module, the power supply selection module is located between the power supply conversion module and the AC power supply unit, and the power supply selection module is also located between the power supply conversion module and the energy storage power supply unit, and the power supply conversion module takes power from the AC power supply unit and / or the energy storage power supply unit based on the power supply selection module.

[0016] Optionally, the isolated power module is configured to have a plurality of output circuits, at least one of the output circuits is configured with a power conversion chip, and the output circuit comprises an output circuit between the isolated power module and the energy storage power conversion unit.

[0017] Optionally, the power conversion chip comprises an input decoupling capacitor, a power voltage input pin, a first resistor, a first capacitor, and an enable pin; wherein,

[0018] The input decoupling capacitor is connected to the power voltage input pin to smooth the input voltage of the power conversion chip and output the smoothed voltage to the power voltage input pin.

[0019] The first resistor and the first capacitor are connected to form a delay control circuit, the delay control circuit is connected to the enable pin, and the delay control circuit is used to control the switching state of the power conversion chip.

[0020] Optionally, the power conversion chip further comprises a second capacitor and a second resistor, a first inductor, a third capacitor, a third resistor, a fourth resistor, and a feedback pin; wherein,

[0021] The second capacitor and the second resistor are located between the input decoupling capacitor and the first inductor to form an isolation circuit.

[0022] The first inductor and the third capacitor are connected to form an output filter circuit, and the output filter circuit is used to smooth the output voltage.

[0023] The third resistor and the fourth resistor are connected to form an output voltage dividing circuit, the output voltage dividing circuit is connected to the feedback pin of the power conversion chip, and the output voltage dividing circuit is used to adjust the output voltage of the power conversion chip.

[0024] Optionally, the energy storage power conversion unit comprises an IGBT power conversion module, the system suitable for power management in an energy storage inverter further comprises an IGBT driving module, and the isolated power module supplies power to the IGBT driving module to drive the IGBT driving module to perform power conversion on the IGBT power conversion module.

[0025] Optionally, the energy storage AC control switch comprises a relay module, and the relay module is used to control the switching state of the circuit between the AC power unit and the energy storage power conversion unit.

[0026] As described above, the system suitable for power management in the energy storage converter provided by the present application firstly, the energy storage converter can obtain electric energy from two different types of power supply (AC power supply unit and energy storage current unit), realize double-end power taking, increase the application flexibility and adaptability of the energy storage converter, and help the stability and reliability of the energy storage converter in the running process, so that the system is suitable for various application scenarios, especially in the occasion where the power supply type is variable or high reliability is required. Secondly, by setting the independent power supply module and the isolation power supply module, good electrical isolation is provided between the power supply lines of different structures to be powered (for example, energy storage AC control switch, energy storage power conversion unit and energy storage AC control module, etc.), which can effectively reduce electromagnetic interference and signal transmission noise. Thirdly, by configuring the energy storage AC control module, the working state control of the energy storage AC control switch and the energy storage power conversion unit can be realized, which helps to ensure the reliability and safety of the system. Finally, the internal circuit structure of the system is simple and has strong applicability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structural schematic diagram of the system suitable for power management in the energy storage converter provided by the embodiment of the present application is provided;

[0028] Figure 2 The partial structural schematic diagram of the system suitable for power management in the energy storage converter provided by the embodiment of the present application is provided;

[0029] Figure 3 The structural schematic diagram of a power conversion chip in the system suitable for power management in the energy storage converter provided by the embodiment of the present application is provided;

[0030] Figure 4 The power-on and power-off sequence diagram of part of the structure in the system suitable for power management in the energy storage converter provided by the embodiment of the present application is provided.

[0031] Explanation of reference signs:

[0032] 100-AC power supply unit, 11-three-phase AC power supply; 200-energy storage power supply unit; 300-energy storage converter;

[0033] 31-energy storage AC control switch, 32-energy storage power conversion unit, 321-IGBT drive module, 33-internal power supply unit of the converter, 331-independent power supply module, 332-isolation power supply module, 34-energy storage AC control module, 35-power supply conversion module, 351-rectifier circuit, 352-filter circuit, 36-power conversion chip, 37-fan; 38-common end.

[0034] VD1~VD6-diode, C11~C14-capacitor, R11~R14-resistor, Cin-input decoupling capacitor, Vin-power voltage input pin, R1-first resistor, C1-first capacitor, EN-enable pin, C2-second capacitor, R2-second resistor, L1-first inductor, C3-third capacitor, R3-third resistor, R4-fourth resistor, Vsence-feedback pin, R5-fifth resistor, C4-fourth capacitor, R6-sixth resistor; Cout-output decoupling capacitor; F1-take electricity fuse, L2-output common mode filter inductor. DETAILED DESCRIPTION

[0035] The present application is described in detail by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. The present application can also be implemented or applied by other different embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application.

[0036] Please refer to Figures 1 to 4 . It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concepts of the present application, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be randomly changed in terms of shape, number and proportion, and the layout pattern of the components may be more complex.

[0037] The embodiments of the present application provide a system suitable for power management in an energy storage converter (hereinafter referred to as "system"). Please refer to Figure 1 , which shows a structural schematic diagram of the system suitable for power management in an energy storage converter. The system includes an alternating current power supply unit 100, an energy storage power supply unit 200 and an energy storage converter 300.

[0038] Specifically, the energy storage converter 300 at least includes an energy storage AC control switch 31, an energy storage power conversion unit 32, an internal power supply unit 33 of the converter, and an energy storage AC control module 34. The AC power supply unit 100 is adaptively connected with the energy storage power conversion unit 32 through the energy storage AC control switch 31. The energy storage power conversion unit 32 is adaptively connected with the energy storage power supply unit 200. The internal power supply unit 33 of the converter includes independent power supply modules 331 with different power supply powers and an isolation power supply module 332. Among them, the independent power supply module 331 at least supplies power to the energy storage AC control switch 31, and the isolation power supply module 332 at least supplies power to the energy storage AC control module 34 and the energy storage power conversion unit 32. The independent power supply module 331 and the isolation power supply module 332 take power from the AC power supply unit 100 and / or the energy storage power supply unit 200. The energy storage AC control module 34 is adaptively connected with the energy storage AC control switch 31 and the energy storage power conversion unit 32 to control the working state of the energy storage AC control switch 31 and the energy storage power conversion unit 32.

[0039] In the embodiments of the present application, first, through the setting of the AC power supply unit 100 and the energy storage power supply unit 200, the energy storage converter 300 can obtain power from two different types of power supplies, realize double-end power taking of the DC end and the AC end, increase the flexibility and adaptability of the system, and help the stability and reliability of the system during operation. For example, if one end of the power supply has a problem, the system can quickly switch to the other end of the power supply to ensure continuous power supply. Further, the system is suitable for a variety of application scenarios, especially in the case of multiple types of power supplies or high reliability requirements. Second, through the setting of the isolation power supply module 332 and the independent power supply module 331, good electrical isolation can be generated between the power supply lines of different structures to be powered (for example, the energy storage AC control switch 31, the energy storage power conversion unit 32, and the energy storage AC control module 34), which can effectively reduce electromagnetic interference and signal transmission noise. Third, through the connection relationship configuration of the energy storage AC control module 34, the working state (for example, the power-on sequence or the switch sequence) of the structure to be powered can be accurately controlled, which is suitable for the stable operation of the internal circuit logic of the energy storage converter 300, so as to avoid abnormal operation caused by unstable power supply or improper timing, such as LED light flickering, fan abnormal noise, and drive module cracking, and ensure that the control logic is not abnormally locked, which helps to ensure the reliability and safety of the system. Finally, the internal circuit structure of the system is simple and has strong applicability.

[0040] In an optional embodiment, the energy storage converter 300 further comprises a power supply conversion module 35, the power supply conversion module 35 comprising a rectifier circuit 351 and a filter circuit 352, wherein the AC power supply unit 100, the rectifier circuit 351 and the filter circuit 352 are connected in sequence, and the energy storage power supply unit 200 is also connected with the filter circuit 352, the rectifier circuit 351 is used to convert the AC input by the AC power supply unit 100 into DC and then output, and the filter circuit 352 is used to filter the DC voltage input by the rectifier circuit 351 and / or the energy storage power supply unit 200 and then output.

[0041] In an optional embodiment, the voltage V1 output by the power supply conversion module 35 is less than or equal to 1500V (i.e. high-voltage input). Please refer to Figure 2 , Figure 2 The local structure (from the AC power supply unit 100 to the isolated power supply module 332) in the system is shown in the schematic diagram. The AC power supply unit 100 comprises a three-phase AC power supply 11 unit 100, and the rectifier circuit 351 comprises a three-phase rectifier bridge. The three-phase AC power supply 11 comprises a power grid, and the energy storage power supply unit 200 comprises an energy storage battery. The independent power supply conversion module is used to convert the first DC output by the power supply conversion module 35 into second DC, and the isolated power supply module is used to convert the first DC output by the power supply conversion module 35 into third DC, the voltage V2 of the second DC and the voltage V3 of the third DC are both less than the voltage V1 of the first DC, and the voltage V2 of the second DC (for example, the voltage V2 of the second DC is 24V) can be equal to or different from the voltage V3 of the third DC.

[0042] In an optional embodiment, the filter circuit 352 is composed of four capacitors (C11 to C14) and four resistors (R11 to R14), the filter circuit 352 constitutes an RC filter, and is connected in parallel with the output end of the rectifier circuit 351, which helps to reduce the voltage fluctuation after rectification.

[0043] In an optional embodiment, the system suitable for power management in the energy storage converter 300 further comprises a power taking fuse F1 and an output end common mode filter inductance L2, and the power taking fuse and the output end common mode filter inductance are located between the power supply conversion module 35 and the isolated power supply module 332. Among them, the power taking fuse F1 is used as an overcurrent protection device to fuse in the case of excessive current, so as to protect the circuit from being damaged, and the output end common mode filter inductance L2 can improve the impedance to common mode noise (noise generated in the circuit due to external magnetic field or power supply itself). It should be noted that the power taking fuse F1 is also located between the power supply conversion module 35 and the independent power supply module 331.

[0044] In an optional embodiment, the isolation power module 332 is configured to have multiple output circuits, at least one of which is configured with a power conversion chip 36. The output circuit includes an output circuit between the isolation power module 332 and the energy storage power conversion unit 32.

[0045] It should be noted that, Figure 1 In the above embodiment, only the power conversion chip 36 (for example, UMD30-B4815 model power chip) is arranged between the isolation power module 332 and the energy storage power conversion unit 32 to convert the third direct current (for example, the voltage V3 of the third direct current is 24V) output by the isolation power module 332 into a fourth direct current (for example, the voltage V4 of the fourth direct current is 15V) and then input the energy storage power conversion unit 32. Among them, the isolation power module 332 can use the gold ascension PV40 series to convert wide and high voltage input into low voltage stable output. In fact, when the isolation power module 332 supplies power to other structures inside the energy storage converter 300, and the required power supply voltage of the other structure does not match the voltage output by the isolation power module 332, the power supply voltage between the other structure and the isolation power module 332 is also adjusted and converted through the corresponding power conversion chip 36. That is, a power conversion chip 36 is arranged on each output circuit of the isolation power module 332, which helps to increase the stability of the circuit and avoid the influence of power fluctuations on the power supply circuit inside the energy storage converter 300.

[0046] In an optional embodiment, the energy storage alternating current control module 34 includes an MCU module. The MCU module includes a Hall sensor, an MCU core power supply, and an MCU peripheral power supply. Among them, the MCU core power supply refers to the working power supply (i.e. the power supply necessary for normal operation) of the internal core of the MCU module, which usually requires stable voltage and current to ensure that the logic circuit and internal processing unit of the MCU module can work. The MCU peripheral power supply refers to the circuit that provides power to the peripheral devices (for example, sensors) or interfaces (for example, communication interfaces) of the MCU module. The voltage and current requirements of the MCU peripheral power supply may be different from those of the MCU core power supply.

[0047] For example, when the isolation power module 332 supplies power to the Hall sensor, a corresponding power conversion chip 36 (for example, TPS5450DDAR model power chip) needs to be arranged between the isolation power module 332 and the Hall sensor (i.e. the output circuit from the isolation power module 332 to the Hall sensor). After the direct current output by the isolation power module 332 flows through the power conversion chip 36, it is input to the Hall sensor, realizing the isolated power supply of the Hall sensor and fully ensuring the safety isolation between high and low voltage.

[0048] For example, when the isolated power module 332 supplies power to the MCU core power supply, a corresponding power conversion chip 36 (for example, a power chip of model MP2122GJ-Z) is arranged between the isolated power module 332 and the MCU core power supply (i.e., the output circuit of the isolated power module 332 to the Hall sensor). The power conversion chip 36 isolates and converts the voltage output by the isolated power module 332 into the required supply voltage (for example, 3.3V) of the MCU core power supply, and then inputs the voltage to the MCU core power supply, so as to ensure that the MCU core power supply works stably and safely.

[0049] In the embodiment of the present application, the isolated power module 332 is configured to have multiple output circuits, and a power conversion chip 36 is arranged on at least one of the output circuits, so as to provide appropriate voltage for the structure supplied by the isolated power module 332, meet the voltage requirement of the structure, and help to optimize the performance, efficiency and safety of the whole system (realize safe isolation between high voltage and low voltage).

[0050] In optional embodiments, please refer to Figure 3 , Figure 3 a structure schematic diagram of a power conversion chip is shown. Each power conversion chip 36 includes an input decoupling capacitor Cin, a power voltage input pin Vin, a first resistor R1, a first capacitor C1 and an enable pin EN. It should be noted that in the embodiment of the present application, the structure of the power conversion chip 36 is exemplarily described by using a power chip of model TPS5450DDAR. In actual application, each power conversion chip 36 can use a power chip of other structure, but the power chip should at least have the structures of the elements introduced below.

[0051] Specifically, the input decoupling capacitor Cin is connected with the power voltage input pin Vin. The input decoupling capacitor Cin is used to output the input voltage V in smoothed to the power voltage input pin Vin. That is, the input decoupling capacitor Cin is used to filter high-frequency noise in the voltage, so as to provide stable voltage to the power conversion chip 36, and the input decoupling capacitor Cin is also connected with the ground.

[0052] Specifically, the first resistor R1 and the first capacitor C1 are connected to form a delay control circuit, the delay control circuit is connected with the enable pin EN, and the enable pin EN can serve as a power supply switch of the power conversion chip 36. The delay control circuit can control the switching state of the power conversion chip 36. More specifically, the delay control circuit can control the power-on time of the enable pin EN, thereby realizing the delay start of the power supply of the power conversion chip 36. In the case that the plurality of output circuits of the isolated power supply module 332 are provided with the power conversion chip 36, the energy storage alternating current control module 34 is connected with the delay control circuit in the plurality of power conversion chips 36 to realize the control of the working state of the structure supplied by the isolated power supply module 332. That is, based on the first resistor R1 and the first capacitor C1, the delay time t of the power conversion chip 36 can be determined, and the delay time t satisfies: ), wherein R is the resistance value of the first resistor R1, C is the capacitance value of the first capacitor C1, E is the high-level voltage value of the enable pin EN, and V is the voltage value of the enable pin EN during the delay period. Of course, the energy storage alternating current control module 34 is also connected with the power-on control circuit of the structure supplied by the independent power supply module 331, for example, the power-on control circuit of the structure supplied by the independent power supply module 331 can be located in a power supply monitoring chip (not shown) between the structure and the independent power supply module 331. Alternatively, in the case that the power-on sequences of a plurality of structures supplied by the independent power supply are not distinguished, the power-on control circuits of the plurality of structures can also be arranged in the independent power supply module 331.

[0053] In an optional embodiment, the power conversion chip 36 further comprises a second capacitor C2 and a second resistor R2, a first inductor L1, a third capacitor C3, a third resistor R3, a fourth resistor R4, and a feedback pin Vsence.

[0054] Specifically, the second capacitor C2 and the second resistor R2 are located between the input decoupling capacitor Cin and the first inductor L1 to form an isolation circuit, and the isolation circuit is used to realize the isolation of the internal circuit of the power conversion chip 36. For example, the isolation between the input circuit and the output circuit in the power conversion chip 36.

[0055] Specifically, the first inductor L1 and the third capacitor C3 are connected to form an output filter circuit 352, and the output filter circuit 352 is used to smooth the output voltage to reduce the ripple of the output voltage.

[0056] Specifically, the third resistor R3 and the fourth resistor R4 are connected to form an output voltage dividing circuit, which is connected to a feedback pin Vsence of the power conversion chip 36, and is used to adjust the output voltage of the power conversion chip 36. Specifically, the output voltage V out of the power conversion chip 36 is fed back to the feedback pin Vsence of the power conversion chip 36 through the voltage dividing circuit, and the power conversion chip 36 adjusts the output voltage V out based on the voltage of the feedback pin Vsence, so that the output voltage V out meets the power supply voltage requirement of the structure to which the power conversion chip 36 is connected.

[0057] In an optional embodiment, the power conversion chip 36 further comprises a fifth resistor R5, a fourth capacitor C4, a sixth resistor R6, and an output decoupling capacitor Cout. The fifth resistor R5 is connected to the first resistor R1 to form an input voltage dividing circuit, which is used to limit the power flowing into the power conversion chip 36. The fourth capacitor C4 is connected to the sixth resistor R6 to form a filter circuit 352, which is used to further filter the output signal of the power conversion chip 36. The fourth capacitor C4 is also connected to a first inductor L1, and the sixth resistor R6 is grounded. The output decoupling capacitor Cout is connected to the first inductor L1 and grounded, and is used to smooth the output ripple, thereby stabilizing the output voltage V out .

[0058] In an optional embodiment, the power conversion chip 36 further comprises a high-side power MOSFET, a number of NC pins, a PH pin, a BOOT pin and a GND pin. The high-side power MOSFET (not shown) is located inside the power conversion chip 36 and serves as a control switch for the power conversion chip 36 at the high voltage side. The NC pin is not connected to the circuit inside the power conversion chip 36 and can be used for expanding applications or testing, etc. The PH pin is usually connected to the source of the high-side MOSFET and can be used for monitoring and controlling the power voltage inside the power conversion chip 36. The BOOT pin is usually a capacitor pin, and the third capacitor C3 is connected between the BOOT pin and the PH pin. The third capacitor C3 can be used to raise the gate drive voltage of the high-side power MOSFET inside the power conversion chip 36, so that the high-side MOSFET can be turned on smoothly and the power conversion chip 36 can work normally. The GND pin serves as a common reference point for the circuit inside the power conversion chip 36 to ensure the stability and reliability of the power supply.

[0059] In an optional embodiment, the energy storage power conversion unit 32 comprises an IGBT power conversion module (not shown), and the system suitable for power management in the energy storage inverter further comprises an IGBT drive module 321. The isolated power supply module 332 supplies power to the IGBT drive module 321, so that the IGBT drive module 321 drives the IGBT power conversion module to perform power conversion.

[0060] In an optional embodiment, the energy storage AC control switch 31 comprises a relay module (not shown), which is used to control the switching state of the circuit between the AC power supply unit 100 and the energy storage power conversion unit 32. Specifically, the relay module controls the switching state of the circuit between the AC power supply unit 100 and the energy storage inverter 300 based on the control signal input by the energy storage AC control module, thereby achieving control of the AC back-through. The control signal can be high or low, depending on the triggering mode of the relay module. When the control signal changes, the contact state of the relay module changes accordingly.

[0061] In an optional embodiment, the system suitable for power management in the energy storage converter further comprises a power supply selection module (not shown) located between the power supply conversion module 35 and the AC power supply unit 100 and between the power supply conversion module 35 and the energy storage power supply unit 200, and the power supply conversion module 35 selects power from the AC power supply unit 100 and / or the energy storage power supply unit 200 based on the power supply selection module. That is, the power supply conversion unit can take power from either of the AC power supply unit 100 and the energy storage power supply unit 200 or take power from both of the AC power supply unit 100 and the energy storage power supply unit 200. In the former case, one of the AC power supply unit 100 and the energy storage power supply unit 200 is selected as the power supply unit and the other as the redundant power supply, and in this case, the power supply conversion module 35 is connected to the selected power supply unit and the energy storage converter 300 is temporarily disconnected from the redundant power supply, so that the flexible switching and adjustment of the power supply unit can be realized by the power supply selection module.

[0062] In an optional embodiment, the inside of the energy storage converter 300 is further configured with a digital / analog circuit, the inside power supply unit 33 of the converter also supplies power to the digital / analog circuit, and the energy storage AC control module 34 is also adaptively connected to the digital / analog circuit to control the working state of the digital / analog circuit. The digital / analog circuit refers to an analog circuit (for example, a current sampling loop, a voltage sampling loop) and a digital circuit (for example, an input / output signal loop).

[0063] In an optional embodiment, please refer to Figure 4 , Figure 4 the power supply sequence diagram of part of the structure of the energy storage converter. The energy storage AC control module 34 is configured to control the MCU kernel power supply, the MCU peripheral power supply, the digital / analog circuit and the energy storage AC control switch 31 to be powered on in sequence. The energy storage AC control switch 31, the digital / analog circuit, the MCU peripheral power supply and the MCU kernel power supply are controlled to be powered off in sequence.

[0064] In an optional embodiment, as Figure 1 shown, the energy storage converter 300 is further configured with a fan 37 for heat dissipation and cooling to prolong the service life of the energy storage converter 300. The power-on and power-off time of the fan 37 can be the same as or different from that of the energy storage AC control switch 31. In addition, the energy storage converter 300 is further configured with a common terminal 38, which is also powered by the isolation power supply module 332.

[0065] In the embodiment of the present application, asFigure 4 As shown, the power-on sequence of each structure requiring power supply is exemplarily illustrated by taking the MCU module as an example. The MCU core power supply is powered on first, so that the core logic circuit of the MCU module can work normally. After the MCU module core power supply is powered on and stabilized, the MCU peripheral power supply is powered on to provide power for the peripheral devices and interfaces of the MCU module, so as to ensure that the I / O pins will not generate unstable unknown states, and to ensure that each circuit control logic can output correct control signals to avoid circuit damage or initialization errors caused by unstable power supply. Then, after the MCU peripheral power supply is powered on and stabilized, the power-on of the digital / analog circuit is continued, and after the digital / analog circuit is powered on and stabilized, the power-on of the energy storage AC control switch 31 (and the fan 37) is finally performed. During the above power-on process, the reset signal of the MCU module always remains at a low level (in order to ensure that the MCU will not start to execute the program before all circuits are stabilized), and becomes high only after all structures are powered off. Since the reset signal of the MCU is usually used to initialize the state of the MCU module, for example, to clear the registers and memory, so as to ensure that the MCU module starts to work from a known and clean state. After the reset signal of the MCU becomes high, the program starts to execute, and the initialization actions of the program include setting registers, configuring peripherals, initializing memory, etc., so as to ensure that the program can start to execute from a correct starting point. After the program initialization is completed, the system enters the normal running logic. At this time, all power supplies and circuits have been stabilized, and the MCU module can start to execute its main functions, such as processing input signals, controlling output devices, etc. The above power-on logic can minimize errors and unstable factors during system startup, and ensure the reliability and performance of the system.

[0066] The power-off sequence of each structure requiring power supply is opposite to the power-on sequence, which can ensure that the electronic system can safely and orderly shut down each component when the system is turned off, and avoid data loss, hardware damage or system instability. For example, the MCU peripheral power supply should be turned off before the MCU core power supply is turned off, which can prevent the peripheral devices from continuing to attempt to communicate or operate with the MCU module after the MCU core power supply is turned off. For example, the power supply of the digital circuit is turned off first, and then the power supply of the analog circuit is turned off. The digital circuit is usually more sensitive to power supply changes, and needs to be turned off first to prevent data damage.

[0067] In summary, the system suitable for power management in the energy storage converter of the present application, firstly, the energy storage converter can obtain power from two different types of power supply (AC power supply unit and energy storage current unit), realize double-end power taking, increase the application flexibility and adaptability of the energy storage converter, and help the stability and reliability of the operation process of the energy storage converter, so that the system is suitable for a variety of application scenarios, especially in the occasion of variable power supply type or high reliability. Secondly, by setting up independent power supply module and isolation power supply module, good electrical isolation is provided between the power supply lines of different structures to be powered (for example, energy storage AC control switch, energy storage power conversion unit and energy storage AC control module, etc.), which can effectively reduce electromagnetic interference and signal transmission noise. Thirdly, by configuring the energy storage AC control module to realize the control of the working state of the energy storage AC control switch and the energy storage power conversion unit, the reliability and safety of the system can be ensured. Finally, the internal circuit structure of the system is simple and has strong applicability. Therefore, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0068] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A system suitable for power management in an energy storage inverter, characterized by: The energy storage converter includes an AC power unit, an energy storage power unit and an energy storage converter; wherein, The energy storage converter includes at least an energy storage AC control switch, an energy storage power conversion unit, an internal power supply unit of the converter and an energy storage AC control module, the AC power unit is connected to the energy storage power conversion unit through the energy storage AC control switch, and the energy storage power conversion unit is connected to the energy storage power unit; The internal power supply unit of the converter includes independent power supply modules with different power supply powers and an isolation power supply module, wherein the independent power supply modules supply power to at least the energy storage AC control switch, and the isolation power supply module supplies power to at least the energy storage AC control module and the energy storage power conversion unit; The independent power supply modules and the isolation power supply module take power from the AC power unit and / or the energy storage power unit; The energy storage AC control module is connected to the energy storage AC control switch and the energy storage power conversion unit to control the working state of the energy storage AC control switch and the energy storage power conversion unit.

2. The system suitable for power management in an energy storage inverter according to claim 1, characterized in that: The energy storage converter further includes a power supply conversion module, the power supply conversion module includes a rectifier circuit and a filter circuit, wherein the AC power unit, the rectifier circuit and the filter circuit are connected in sequence, and the energy storage power unit is also connected to the filter circuit, the rectifier circuit is used to convert AC input by the AC power unit into DC and output, and the filter circuit is used to filter DC voltage input by the rectifier circuit and / or the energy storage power unit and output.

3. The system suitable for power management in an energy storage inverter according to claim 2, characterized in that: The voltage output by the power supply conversion module is less than or equal to 1500V, the AC power unit includes a three-phase AC power unit, and the rectifier circuit includes a three-phase rectifier bridge.

4. The system suitable for power management in an energy storage inverter according to claim 2, characterized in that: The system suitable for power management in the energy storage converter further includes a power taking fuse and an output end common mode filter inductor, the power taking fuse and the output end common mode filter inductor are located between the power supply conversion module and the isolation power supply module.

5. The system suitable for power management in an energy storage inverter according to claim 2, characterized in that: The system suitable for power management in the energy storage converter further includes a power supply selection module, the power supply selection module is located between the power supply conversion module and the AC power unit, and the power supply selection module is also located between the power supply conversion module and the energy storage power unit, the power supply conversion module takes power from the AC power unit and / or the energy storage power unit based on the power supply selection module.

6. The system suitable for power management in an energy storage inverter according to claim 1, characterized in that: The isolation power supply module is configured to have a plurality of output circuits, at least one of the output circuits is configured with a power conversion chip, and the output circuit includes an output circuit between the isolation power supply module and the energy storage power conversion unit.

7. The system suitable for power management in an energy storage inverter according to claim 6, characterized in that, The power conversion chip includes an input decoupling capacitor, a power voltage input pin, a first resistor, a first capacitor and an enable pin; wherein, The input decoupling capacitor is connected to the power voltage input pin to smooth the input voltage input into the power conversion chip and output to the power voltage input pin; The first resistance is connected with the first capacitor to form a delay control circuit, the delay control circuit is connected with the enable pin, and the delay control circuit is used for controlling the switching state of the power conversion chip.

8. The system suitable for power management in an energy storage inverter according to claim 7, characterized in that, The power conversion chip further comprises a second capacitor and a second resistance, a first inductor, a third capacitor, a third resistance, a fourth resistance and a feedback pin; wherein, The second capacitor and the second resistance are located between the input decoupling capacitor and the first inductor to form an isolation circuit; The first inductor is connected with the third capacitor to form an output filter circuit, and the output filter circuit is used for smoothing the output voltage; The third resistance and the fourth resistance are connected to form an output voltage dividing circuit, the output voltage dividing circuit is connected with the feedback pin of the power conversion chip, and the output voltage dividing circuit is used for adjusting the output voltage of the power conversion chip.

9. The system suitable for power management in an energy storage inverter according to claim 1, wherein, The energy storage power conversion unit comprises an IGBT power conversion module, the system suitable for power management in the energy storage inverter further comprises an IGBT driving module, the isolation power module supplies power for the IGBT driving module, so that the IGBT driving module drives the IGBT power conversion module to perform power conversion.

10. The system suitable for power management in an energy storage inverter according to claim 1, wherein, The energy storage alternating current control switch comprises a relay module, and the relay module is used for controlling the switching state of the circuit between the alternating current power unit and the energy storage power conversion unit.

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