A hybrid inverter, charging pile and power supply system

Abstract

The utility model discloses a kind of hybrid inverter, charging pile and power supply system, by integrating switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module and control module in same topology, the unified energy channel of photovoltaic-dc bus-battery-ac side is constructed, control module drives switching switch according to demand between grid-connected and off-grid two kinds of working conditions fast, reliable switching: support photovoltaic grid-connected / charge battery when normal power supply, seamlessly transfer to battery and off-grid load power supply when abnormal power supply.The structure makes each port function boundary clear, power flow programmable, avoid external switching and multi-machine cascade, reduce system complexity and wiring cost;While it is convenient to implement photovoltaic MPPT and battery bidirectional energy management, improve energy utilization and power supply continuity, and lay system architecture foundation for subsequent improvement power density, reduce filter / heat dissipation scale.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a hybrid inverter, charging pile and power supply system. Background Technology

[0002] Hybrid inverters serve as energy hubs between photovoltaic arrays, energy storage batteries, AC grids, and off-grid loads. They typically have both DC-side interfaces (connecting photovoltaics and batteries) and AC-side interfaces (connecting grids and off-grid loads). Through control strategies, they enable multi-energy flow operation scenarios such as grid-connected photovoltaic power generation, photovoltaic charging of batteries, grid charging of batteries, battery discharging to the grid, and battery power supply to off-grid loads.

[0003] However, most related technologies use IGBTs as the main power devices, which have limited switching frequencies. Under high-voltage, high-current applications, this inevitably leads to significant output current ripple, necessitating the use of higher-inductance filter inductors and larger-capacity filter capacitors to meet grid-connected / off-grid power quality requirements, thus increasing the overall size and weight of the system. Simultaneously, the increased power output significantly raises device conduction and switching losses, increasing heat dissipation pressure and impacting operational continuity and stability. Furthermore, the additional heat dissipation structure increases system complexity and wiring costs.

[0004] Therefore, the relevant technologies need to be improved. Utility Model Content

[0005] The main objective of this invention is to provide a hybrid inverter, charging pile, and power supply system to at least solve the technical problems mentioned in the related technologies.

[0006] To achieve the above objectives, a first aspect of this utility model provides a hybrid inverter, the hybrid inverter comprising a switching switch, an AC / DC conversion module, a DC / DC conversion module, a BOOST module, and a control module;

[0007] The first terminal of the AC / DC conversion module is used to be electrically connected to the power grid and the AC load respectively through the switching switch; the second terminal of the AC / DC conversion module is used to be electrically connected to the energy storage battery through the DC / DC conversion module; the third terminal of the AC / DC conversion module is used to be electrically connected to the photovoltaic module through the BOOST module; and the control module is electrically connected to the switching switch, the AC / DC conversion module, the DC / DC conversion module and the BOOST module respectively.

[0008] The control module is used to control the switching switch so that the hybrid inverter switches between grid-connected operation mode and off-grid operation mode.

[0009] A second aspect of this utility model provides a charging pile, including a charging pile body and a hybrid inverter as described in the first aspect, wherein the hybrid inverter is built into the charging pile body.

[0010] A third aspect of this utility model provides a power supply system, including a power grid, an AC load, an energy storage battery, a photovoltaic module, and a hybrid inverter as described in the first aspect; the hybrid inverter is electrically connected to the power grid, the AC load, the energy storage battery, and the photovoltaic module respectively.

[0011] This invention relates to a hybrid inverter, charging pile, and power supply system. By integrating a switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module, and control module within the same topology, it constructs a unified energy channel from photovoltaic power to the DC bus, battery, and AC side. The control module drives the switching switch on demand to quickly and reliably switch between grid-connected and off-grid operating conditions: when the mains power is normal, it supports grid-connected photovoltaic power / battery charging; when the mains power is abnormal, it seamlessly switches to battery power supply for off-grid loads. This structure makes the functional boundaries of each port clear and the power flow programmable, avoiding external switching and multi-machine cascading, reducing system complexity and wiring costs. It also facilitates the implementation of photovoltaic MPPT and bidirectional battery energy management, improving energy utilization and power supply continuity, and laying the system architecture foundation for subsequent increases in power density and reduction in filtering / heat dissipation scale. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram illustrating the application scenario of the hybrid inverter provided in the embodiments of this application;

[0014] Figure 2 A schematic block diagram of a hybrid inverter provided in an embodiment of this application;

[0015] Figure 3 This is a circuit connection diagram of a hybrid inverter provided in an embodiment of this application. Detailed Implementation

[0016] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0018] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "multiple" means two or more, unless otherwise explicitly specified. The term "comprising" indicates the presence of the described feature, whole, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. The term "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may include three cases: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0019] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art; the terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0020] Furthermore, terms such as "exemplary," "for example," and "optional" are used to indicate illustrative purposes. Any technical solution described by the above terms in the embodiments of this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, these terms are intended to present the relevant technical concepts in terms of specific implementation methods.

[0021] Please refer to them in order. Figures 1 to 3This application provides a hybrid inverter, which mainly serves as an energy hub between photovoltaic modules, energy storage batteries, AC loads (DC loads), and the power grid. It is equipped with both DC and AC ports: the DC port is used to connect the energy storage battery and photovoltaic modules, while the AC port is used to connect to a single-phase power grid and off-grid loads. Through a control module, the power flow is uniformly managed, enabling various energy conversion methods under different operating conditions, such as photovoltaic power generation to the grid, photovoltaic charging of the battery, grid charging of the battery, battery discharging to the grid, and battery power supply to off-grid loads, thereby completing hybrid energy conversion in both grid-connected and off-grid scenarios.

[0022] The hybrid inverter includes a switching switch 10, an AC / DC conversion module 20, a DC / DC conversion module 30, a BOOST module 40, and a control module 50. The components are described below:

[0023] The first terminal of the AC / DC converter module 20 is used for ( Figure 2 The "1" terminal of the AC / DC converter module 20 can be electrically connected to the mains or AC load via the switch 10; the second terminal of the AC / DC converter module 20 ( Figure 3 Terminal "2" is used for electrical connection between the DC / DC converter module 30 and the energy storage battery; the third terminal of the AC / DC converter module 20 ( Figure 3 The control module 50 is electrically connected to the photovoltaic module via the BOOST module 40 (terminal "3"). The control module 50 is also electrically connected to the switching switch 10, AC / DC conversion module 20, DC / DC conversion module 30 and BOOST module 40, outputting drive and control commands and collecting necessary operating parameters such as voltage, current and temperature.

[0024] When the hybrid inverter is running, the control module 50 controls the switching switch 10 to be turned on or off, thereby controlling the AC / DC conversion module 20 to be electrically connected to the grid or AC load, so that the hybrid inverter can switch between grid-connected operation mode and off-grid operation mode.

[0025] Therefore, the hybrid inverter of this application embodiment has two operating modes:

[0026] When the hybrid inverter is in grid-connected operation mode, the control module 50 transmits corresponding Relay Control signals (switch control signals), INV PWM signals (AC / DC control signals), DC PWM signals (DC / DC control signals), and Boost PWM signals (BOOST control signals) to the switching switch 10, AC / DC conversion module 20, DC / DC conversion module 30, and BOOST module 40. This controls the switching switch 10 to connect the grid-connected port and disconnect the off-grid port (i.e., the AC / DC conversion module 20 is connected to the grid). This causes the AC / DC conversion module 20 to operate in grid-connected current control mode, injecting / absorbing current into the grid according to the grid voltage phase and maintaining the DC bus voltage. The BOOST module 40 performs maximum power point tracking to send photovoltaic power into the DC bus, and the DC / DC conversion module 30 charges and discharges the battery according to the battery state of charge to achieve power balance.

[0027] When the hybrid inverter is in off-grid operation mode, the control module 50 also transmits corresponding Relay Control signals (switching switch control signals), INV PWM signals (AC / DC control signals), DC PWM signals (DC / DC control signals), and Boost PWM signals (BOOST control signals) to the switching switch 10, AC / DC conversion module 20, DC / DC conversion module 30, and BOOST module 40. This controls the switching switch 10 to connect the off-grid port and disconnect the grid-connected port (i.e., the AC / DC conversion module 20 is connected to the AC load), so that the AC / DC conversion module operates in inverter voltage control mode, outputting AC power of a set frequency and amplitude to the AC load and maintaining the DC bus voltage. The BOOST module and the DC / DC conversion module work together to regulate the DC bus voltage and supply power to the AC load.

[0028] As can be seen, the hybrid inverter in this embodiment integrates a switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module, and control module within the same topology, constructing a unified energy channel from photovoltaics to the DC bus, battery, and AC side. The control module drives the switching switch on demand to quickly and reliably switch between grid-connected and off-grid operating conditions: when the mains power is normal, it supports photovoltaic grid connection / battery charging; when the mains power is abnormal, it seamlessly switches to battery power supply for off-grid loads. This structure makes the functional boundaries of each port clear and the power flow programmable, avoiding external switching and multi-machine cascading, reducing system complexity and wiring costs; at the same time, it facilitates the implementation of photovoltaic MPPT and bidirectional energy management of the battery, improving energy utilization and power supply continuity, and laying the system architecture foundation for subsequent increases in power density and reduction of filtering / heat dissipation scale.

[0029] It should be noted that the embodiments of this application focus on the circuit connection relationship of each functional unit and the systematic configuration of the energy channel (including the connection and cooperation of the switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module and the connected ports / buses / filter units). Regarding the driving and scheduling strategies of the control module for the above-mentioned power units (such as grid-connected / off-grid switching logic, MPPT control, DC bus voltage regulation, battery charge / discharge limiting / current limiting, etc.), these are all conventional technical means that can be directly selected or equivalently replaced by those skilled in the art based on existing control theories and mature algorithms (such as PI / PR control, SVPWM / SPWM, disturbance observation / admittance incremental MPPT, SOC management, etc.). This application is not limited to specific control algorithms or parameters, but focuses on the unit connection relationship and energy flow organization method as the main protection content; the hardware and software implementation of the controller, algorithm details, and parameter tuning can all be equivalently modified without departing from the technical concept of this application.

[0030] It should be understood that the switching switch 10 can be an AC-side selector (e.g., a silicon carbide (SiC) MOSFET) that switches between the "grid-connected port (grid)" and the "off-grid port (AC load)" on the line, enabling the inverter to switch between grid-connected and off-grid operating modes. The AC / DC conversion module 20 can be an AC-DC bidirectional power conversion unit that, when grid-connected, controls current supply / delivery to / from the grid according to the grid phase; when off-grid, it outputs a set frequency and voltage to supply power to the load and participates in maintaining the DC bus voltage. The DC / DC conversion module 30 can be a bidirectional DC-DC conversion unit connected to the energy storage battery, realizing battery charging / discharging and power direction and magnitude adjustment, working together to maintain DC bus stability. The BOOST module 40 can be a photovoltaic-side boost and MPPT unit (one or more channels) that boosts the photovoltaic DC energy and connects it to the DC bus, tracking the maximum power point under control. The control module 50 can be the system coordination and drive core (e.g., CPU), responsible for collecting signals such as voltage / current / temperature, controlling the grid connection / off-grid selection of the switching switch 10, and sending PWM / control commands to the AC / DC, DC / DC and BOOST modules to realize energy management and protection linkage between the ports.

[0031] In an optional embodiment of this application, the hybrid inverter further includes a capacitor C1.

[0032] Specifically, one end of capacitor C1 is electrically connected to the third terminal of AC / DC conversion module 20 and BOOST module 40, while the other end of capacitor C1 is electrically connected to the second terminal of AC / DC conversion module 20 and DC / DC conversion module 30.

[0033] This embodiment uses capacitor C1 to construct a DC bus and serve as an energy buffer and coupling node for each power unit, thereby providing a common DC bus between the photovoltaic module, energy storage battery and AC side, achieving energy aggregation and bus voltage stability.

[0034] In an optional embodiment of this application, the BOOST module includes a first BOOST submodule ( Figure 3 The first module is "boost1") and the second BOOST submodule ( Figure 3 (in "boost2").

[0035] Specifically, the first end of the first BOOST submodule is electrically connected to one end of the capacitor C1, the third end of the AC / DC conversion module 20, the first end of the second BOOST submodule, and the first end of the DC / DC conversion module 30. The second end of the first BOOST submodule is electrically connected to the second end of the second BOOST submodule and the second end of the DC / DC conversion module 30. The third end of the first BOOST submodule is used to be electrically connected to the photovoltaic module, and the third end of the second BOOST submodule is used to be electrically connected to the photovoltaic module.

[0036] This implementation uses two BOOST sub-modules to enable the two photovoltaic systems to be boosted by their respective voltages and then connected to the DC bus with capacitor C1 as the common coupling point. This facilitates the control module to perform MPPT on the two photovoltaic systems and supply power to the bus.

[0037] In an optional embodiment of this application, the hybrid inverter further includes an AC-side filter module, and the first terminal of the AC / DC conversion module 20 includes a first AC terminal ( Figure 3 (1A) and the second AC terminal ( Figure 3 (1B)

[0038] Specifically, the AC-side filter module is electrically connected between the first AC terminal, the second AC terminal, and the switching switch. That is, the AC-side filter module is electrically connected between the AC / DC conversion module 20 and the switching switch 10, and is used to filter and suppress harmonics of the AC-side current / voltage.

[0039] In an optional embodiment of this application, the AC side filtering module includes a first inductor L1, a second inductor L2, and a parallel capacitor C2.

[0040] Specifically, one end of the first inductor L1 is connected to the first AC terminal of the AC / DC conversion module 20. Figure 3The first inductor L1 is electrically connected to one end of the parallel capacitor C2 and the first terminal of the switch 10. The other end of the parallel capacitor C2 is electrically connected to one end of the second inductor L2 and the second terminal of the switch 10. The other end of the second inductor L2 is connected to the second AC terminal of the AC / DC converter module 20. Figure 3 The AC side filter module ("1B") is electrically connected. This means that the AC side filter module constitutes an LCL-type output filter network, which is used to suppress switching harmonics, reduce current ripple, and improve power quality and stability during grid-connected / off-grid operation.

[0041] In an optional embodiment of this application, the hybrid inverter further includes a first filter module 60 and a second filter module 70.

[0042] Specifically, the first terminal of the first filter module 60 is electrically connected to both the third terminal of the switch 10 and the first terminal of the second filter module 70, and the second terminal of the first filter module 60 is electrically connected to both the fourth terminal of the switch 10 and the second terminal of the second filter module 70. Thus, the two filter modules are located between the switch and the external port, enabling electromagnetic interference suppression and common-mode / differential-mode noise filtering on the output side under both grid-connected and off-grid operating conditions, ensuring power quality and electromagnetic compatibility at both the grid-connected and off-grid ends.

[0043] In an optional embodiment of this application, the hybrid inverter further includes a third filter module 80 and a fourth filter module 90.

[0044] Specifically, the DC / DC conversion module 30 is provided with a third terminal, which is electrically connected to the energy storage battery via the third filter module 80 to suppress ripple current and high-frequency interference on the battery side and improve electromagnetic compatibility; the first BOOST submodule and the second BOOST submodule are respectively electrically connected to the corresponding photovoltaic modules via the fourth filter module 90 to filter out common-mode / differential-mode noise on the photovoltaic side, reduce return ripple and stabilize the photovoltaic side operating point to cooperate with MPPT control.

[0045] In optional embodiments of this application, a host computer is also included. Figure 3 The host computer (CPU2) is connected to the control module 50 via CAN, RS485, or Ethernet for parameter configuration and distribution (grid / off-grid strategy, power / voltage / current limits, MPPT and battery management parameters), real-time monitoring and display (voltage, current, power, temperature and event status of each port), data recording and export (operating curves, alarms and fault codes), remote maintenance (program / parameter upgrades, log feedback), and alarm linkage and historical tracing, thereby realizing centralized management and remote operation and maintenance of the hybrid inverter.

[0046] This application also provides a charging pile, including a charging pile body and a hybrid inverter as described in the above embodiments, wherein the hybrid inverter is built into the charging pile body.

[0047] This application also provides a power supply system, including a power grid, an AC load, an energy storage battery, a photovoltaic module, and a hybrid inverter as described in the above embodiments; the hybrid inverter is electrically connected to the power grid, the AC load, the energy storage battery, and the photovoltaic module respectively.

[0048] This invention relates to a hybrid inverter, charging pile, and power supply system. By integrating a switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module, and control module within the same topology, it constructs a unified energy channel from photovoltaic power to the DC bus, battery, and AC side. The control module drives the switching switch on demand to quickly and reliably switch between grid-connected and off-grid operating conditions: when the mains power is normal, it supports grid-connected photovoltaic power / battery charging; when the mains power is abnormal, it seamlessly switches to battery power supply for off-grid loads. This structure makes the functional boundaries of each port clear and the power flow programmable, avoiding external switching and multi-machine cascading, reducing system complexity and wiring costs. It also facilitates the implementation of photovoltaic MPPT and bidirectional battery energy management, improving energy utilization and power supply continuity, and laying the system architecture foundation for subsequent increases in power density and reduction in filtering / heat dissipation scale.

[0049] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A hybrid inverter, characterized in that, The hybrid inverter includes a switching switch, an AC / DC conversion module, a DC / DC conversion module, a BOOST module, and a control module; The first terminal of the AC / DC conversion module is used to be electrically connected to the power grid and the AC load respectively through the switching switch; the second terminal of the AC / DC conversion module is used to be electrically connected to the energy storage battery through the DC / DC conversion module; the third terminal of the AC / DC conversion module is used to be electrically connected to the photovoltaic module through the BOOST module; and the control module is electrically connected to the switching switch, the AC / DC conversion module, the DC / DC conversion module and the BOOST module respectively. The control module is used to control the switching switch so that the hybrid inverter switches between grid-connected operation mode and off-grid operation mode.

2. The hybrid inverter as described in claim 1, characterized in that, The hybrid inverter also includes capacitors; One end of the capacitor is electrically connected to the third terminal of the AC / DC conversion module and the BOOST module, and the other end of the capacitor is electrically connected to the second terminal of the AC / DC conversion module and the DC / DC conversion module.

3. The hybrid inverter as described in claim 2, characterized in that, The BOOST module includes a first BOOST submodule and a second BOOST submodule; The first terminal of the first BOOST submodule is electrically connected to one terminal of the capacitor, the third terminal of the AC / DC conversion module, the first terminal of the second BOOST submodule, and the first terminal of the DC / DC conversion module. The second terminal of the first BOOST submodule is electrically connected to the second terminal of the second BOOST submodule and the second terminal of the DC / DC conversion module. The third terminal of the first BOOST submodule is used to be electrically connected to the photovoltaic module, and the third terminal of the second BOOST submodule is used to be electrically connected to the photovoltaic module.

4. The hybrid inverter as described in claim 3, characterized in that, The hybrid inverter also includes an AC-side filter module, and the first end of the AC / DC conversion module includes a first AC end and a second AC end; The AC side filter module is electrically connected between the first AC terminal, the second AC terminal, and the switching switch.

5. The hybrid inverter as described in claim 4, characterized in that, The AC side filtering module includes a first inductor, a second inductor, and a parallel capacitor; One end of the first inductor is electrically connected to the first AC terminal of the AC / DC conversion module, and the other end of the first inductor is simultaneously electrically connected to one end of the parallel capacitor and the first terminal of the switching switch. The other end of the parallel capacitor is simultaneously electrically connected to one end of the second inductor and the second terminal of the switching switch. The other end of the second inductor is electrically connected to the second AC terminal of the AC / DC conversion module.

6. The hybrid inverter as described in claim 5, characterized in that, The hybrid inverter also includes a first filter module and a second filter module; The first end of the first filtering module is electrically connected to the third end of the switching switch and the first end of the second filtering module, and the second end of the first filtering module is electrically connected to the fourth end of the switching switch and the second end of the second filtering module.

7. The hybrid inverter as described in claim 6, characterized in that, The hybrid inverter also includes a third filter module and a fourth filter module; The third terminal of the DC / DC converter module is used to be electrically connected to the energy storage battery through the third filter module, and the first BOOST submodule and the second BOOST submodule are used to be electrically connected to the photovoltaic module through the fourth filter module.

8. The hybrid inverter as claimed in any one of claims 1 to 7, characterized in that, When the hybrid inverter is in grid-connected operation mode, the control module controls the switching switch to connect the grid-connected port and disconnect the off-grid port, so that the AC / DC conversion module operates in grid-connected current control mode, injecting / absorbing current into the grid according to the grid voltage phase and maintaining the DC bus voltage; the BOOST module performs maximum power point tracking to send photovoltaic power into the DC bus, and the DC / DC conversion module charges and discharges the battery according to the battery state of charge to achieve power balance; When the hybrid inverter is in off-grid operation mode, the control module controls the switching switch to connect the off-grid port and disconnect the grid-connected port, so that the AC / DC conversion module works in inverter voltage control mode, outputting AC power of set frequency and amplitude to the AC load and maintaining the DC bus voltage; the BOOST module and the DC / DC conversion module work together to stabilize the DC bus voltage and supply power to the AC load.

9. A charging pile, characterized in that, It includes a charging pile body and a hybrid inverter as described in any one of claims 1 to 8, wherein the hybrid inverter is built into the charging pile body.

10. A power supply system, characterized in that, Includes the power grid, AC load, energy storage battery, photovoltaic module, and hybrid inverter as described in any one of claims 1 to 8; The hybrid inverter is electrically connected to the power grid, AC load, energy storage battery, and photovoltaic module, respectively.

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