Energy storage converter and energy storage system

Abstract

This application discloses an energy storage converter and an energy storage system. The energy storage converter includes a converter circuit, a bus capacitor, a pre-charge power supply, and a first switching power supply. The converter circuit includes a DC side and an AC side. The bus capacitor is connected to the DC side, the pre-charge power supply is connected to the bus capacitor, the DC input terminal of the first switching power supply is connected to the DC side, the AC input terminal of the first switching power supply is connected to the AC side, and the output terminal of the first switching power supply is connected to the input terminal of the pre-charge power supply. In the embodiment of this application, the energy storage converter converts the input DC voltage or AC voltage into a suitable DC voltage through the setting of the second switching power supply to power the pre-charge power supply, thereby providing a pre-charge voltage to the bus capacitor. This achieves a soft start-up of the energy storage converter and avoids damage to the energy storage converter due to inrush current when it is powered on.

Description

Technical Field

[0001] This application relates to the field of energy storage converter technology, and more specifically, to an energy storage converter and an energy storage system. Background Technology

[0002] In current related technologies, when the energy storage converter is turned on, the voltage of the DC side bus capacitor is 0. However, the initial current when the energy storage converter is turned on may cause the voltage of the bus capacitor to rise suddenly, which may lead to inrush current and damage to the energy storage converter. Utility Model Content

[0003] This application provides an energy storage converter and an energy storage system.

[0004] The energy storage converter provided in this application includes a converter circuit, including a DC side and an AC side;

[0005] A bus capacitor is connected to the DC side; a pre-charge power supply is connected to the bus capacitor; a first switching power supply has its DC input terminal connected to the DC side, its AC input terminal connected to the AC side, and its output terminal connected to the input terminal of the pre-charge power supply.

[0006] Thus, in this embodiment of the application, the energy storage converter converts the input DC voltage or AC voltage into a suitable DC voltage through the setting of the first switching power supply to power the pre-charge source, thereby providing a pre-charge voltage to the bus capacitor, thereby achieving a slow start of the energy storage converter and avoiding damage to the energy storage converter due to inrush current when it is powered on.

[0007] In some embodiments, the first switching power supply includes:

[0008] A DC switching power supply, wherein the input terminal of the DC switching power supply is connected to the DC side, and the output terminal of the DC switching power supply is connected to the input terminal of the pre-charge power supply;

[0009] An AC switching power supply, wherein the input terminal of the AC switching power supply is connected to the AC side, and the output terminal of the AC switching power supply is connected to the input terminal of the pre-charge power supply.

[0010] In some embodiments, the second switching power supply further includes:

[0011] A first diode, the anode of which is connected to the output terminal of the DC switching power supply, and the cathode of which is connected to the input terminal of the pre-charge power supply;

[0012] The second diode has its anode connected to the output terminal of the AC switching power supply and its cathode connected to the input terminal of the pre-charge power supply.

[0013] In some embodiments, the energy storage converter further includes:

[0014] Power supply module;

[0015] The second switching power supply is used, and the output terminal of the pre-charge power supply is connected to the power consumption module through the second switching power supply. The bus capacitor is also connected to the power consumption module through the second switching power supply.

[0016] In some embodiments, the power module includes a control submodule, the power port of which is connected to the output terminal of the first switching power supply and the output terminal of the second switching power supply.

[0017] In some embodiments, the power module further includes:

[0018] The third diode has its anode connected to the output terminal of the second switching power supply and its cathode connected to the power port of the control submodule.

[0019] The fourth diode has its anode connected to the output terminal of the first switching power supply, and its cathode connected to the power port of the control submodule.

[0020] In some embodiments, the power module further includes a device submodule and a heat dissipation submodule, wherein the device submodule and the heat dissipation submodule are connected to the output terminal of the second switching power supply.

[0021] In some implementations, the control port of the pre-charge power source is connected to the control port of the control submodule.

[0022] In some embodiments, the energy storage converter further includes a positive contactor and a negative contactor, the positive contactor being connected to the positive terminal of the DC side and the negative contactor being connected to the negative terminal of the DC side.

[0023] This application also provides an energy storage system, which includes the energy storage converter of any of the above embodiments.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0026] Figure 1 This is one of the structural schematic diagrams of the energy storage converter in the embodiments of this application;

[0027] Figure 2 This is the second schematic diagram of the energy storage converter in the embodiments of this application.

[0028] The components include: energy storage converter 100, converter circuit 110, DC side 111, AC side 112, bus capacitor 113, DC connection terminal 114, AC connection terminal 115, power consumption module 120, control submodule 121, device submodule 122, heat dissipation submodule 123, pre-charge power supply 130, first switching power supply 150, second switching power supply 140, DC switching power supply 151, AC switching power supply 152, third diode 161, fourth diode 162, first diode 163, and second diode 164. Detailed Implementation

[0029] The embodiments of this application are described in detail below. These embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] This application provides an energy storage converter and an energy storage system, relating to the field of energy storage converter technology.

[0031] First, the technical field involved in the embodiments of this application will be explained as follows:

[0032] This application relates to the field of power storage converter technology. A power storage converter (PCS) is a core power electronic device in an energy storage system that enables bidirectional power conversion and intelligent control. Its main function is to achieve efficient energy interaction between energy storage devices (such as batteries, supercapacitors, flywheels, etc.) and the grid or load through precise control of current form, voltage level, power flow direction, and power quality. In terms of technical architecture, power storage converters are typically composed of modules, using power semiconductor devices such as IGBTs and MOSFETs as core switching elements, enabling stable operation. Its operating modes cover seamless switching between grid-connected and off-grid modes: in charging mode, the PCS converts AC power from the grid or renewable energy generation into DC power for storage in the energy storage unit; in discharging mode, it inverts the DC power from the energy storage unit into AC power with the same frequency and phase as the grid, feeding it back into the grid or directly supplying the load, employing multiple control strategies.

[0033] In energy storage converters, the initial current at startup has a significant negative impact, especially on the bus capacitor. The initial current can cause the bus capacitor voltage to rise, resulting in a large inrush current. This inrush current can easily cause battery over-discharge, component overheating and burnout, or grid voltage fluctuations.

[0034] Considering the above issues, please refer to Figure 1 The energy storage converter 100 in this application embodiment includes:

[0035] The converter circuit 110 includes a DC side 111 and an AC side 112;

[0036] Bus capacitor 113 is connected in parallel to DC side 111;

[0037] Pre-charge power supply 130, the output terminal of pre-charge power supply 130 is connected to bus capacitor 113;

[0038] The first switching power supply 150 has its DC input terminal connected to the DC side 111, its AC input terminal connected to the AC side 112, and its output terminal connected to the input terminal of the pre-charge power supply 130.

[0039] Specifically, Figure 1 This is a schematic diagram of the energy storage converter 100 provided in the first embodiment of this application, as shown below. Figure 1 As shown, the energy storage converter 100 provided in this embodiment includes a converter circuit 110, a bus capacitor 113, a power module 120, a pre-charge power supply 130, and a first switching power supply 150. The converter circuit 110 includes a DC side 111 and an AC side 112. The bus capacitor 113 is connected to the DC side 111, and the pre-charge power supply 130 is connected to the bus capacitor 113.

[0040] Specifically, the converter circuit 110 may include a DC side 111 and an AC side 112. The converter circuit 110 can realize efficient bidirectional energy conversion between the DC power on the DC side 111 and the AC power on the AC side 112, and ensure the safe and stable operation of the system through precise power electronic control.

[0041] For example, the energy storage converter 100 includes a DC connection terminal 114 and an AC connection terminal 115. The DC side 111 of the converter circuit 110 can be connected to the energy storage battery through the DC connection terminal 114, and the AC side 112 of the converter circuit 110 can be connected to the power grid through the AC connection terminal 115. When the energy storage battery needs to be charged, the converter circuit 110 can convert the AC power generated by the grid or renewable energy into controllable DC power to charge the energy storage battery. When the energy storage battery needs to be discharged, the converter circuit 110 can invert the DC power from the energy storage battery into sinusoidal AC power with the same frequency and phase as the grid, realizing grid-connected power supply or off-grid independent operation.

[0042] The first switching power supply 150 is a power supply device that converts electrical energy through switching devices. It has the advantages of high efficiency, small size and stable output. In the energy storage converter 100, the DC input terminal of the first switching power supply 150 is connected to the DC side 111, its AC input terminal is connected to the AC side 112, and its output terminal is connected to the input terminal of the pre-charge power supply 130.

[0043] Based on the aforementioned connection relationships, the first switching power supply 150 can convert the DC voltage from the DC side 111 or the AC voltage from the AC side 112 into a suitable DC voltage to supply power to the pre-charge source 130, thereby providing a pre-charge voltage to the bus capacitor 113. If the energy storage converter 100 operates in off-grid mode, the first switching power supply 150 can convert the DC voltage from the DC side 111 into a suitable DC voltage to supply power to the pre-charge source 130. If the energy storage converter 100 operates in grid-connected mode, the first switching power supply 150 can convert the AC voltage from the AC side 112 into a suitable DC voltage to supply power to the pre-charge source 130. Furthermore, when voltage is simultaneously introduced from both the DC side 111 and the AC side 112, the first switching power supply can also utilize the mutual top effect between the two to select a suitable DC voltage from the converted DC voltages to supply power to the pre-charge source 130.

[0044] In this way, when the energy storage converter 100 starts up, the AC and DC power of the first switching power supply 150 is used to charge the pre-charge source 130, and the pre-charge source 130 further charges the bus capacitor 113, thereby providing a pre-charge voltage to the bus capacitor 113, thus realizing the slow start of the energy storage converter 100 and avoiding damage to components caused by sudden changes in current and voltage during startup.

[0045] Thus, in this embodiment of the application, the energy storage converter 100 converts the input DC voltage or AC voltage into a suitable DC voltage through the setting of the first switching power supply 150 to supply power to the pre-charge power supply 130, thereby providing a pre-charge voltage to the bus capacitor 113, thereby realizing the slow start of the energy storage converter 100 and avoiding damage to the energy storage converter 100 due to the inrush current when it is powered on.

[0046] In some embodiments, the first switching power supply 150 includes:

[0047] DC switching power supply 151, the input terminal of DC switching power supply 151 is connected to DC side 111, and the output terminal of DC switching power supply 151 is connected to the input terminal of pre-charge power supply 130.

[0048] AC switching power supply 152, the input terminal of AC switching power supply 152 is connected to AC side 112, and the output terminal of AC switching power supply 152 is connected to the input terminal of pre-charge power supply 130.

[0049] Figure 2 This is a schematic diagram of the energy storage converter 100 provided in the second embodiment of this application, as shown below. Figure 2 As shown, in some embodiments, the first switching power supply 150 is configured to convert the DC power connected to the DC connection terminal 114 or the AC power connected to the AC connection terminal 115 into a corresponding pre-charge voltage and provide it to the pre-charge power supply 130. The input terminals of the first switching power supply 150 include a DC input terminal and an AC input terminal. A DC switching power supply 151 is provided on the DC input terminal side, and the input terminal of the DC switching power supply 151 is the DC input terminal of the first switching power supply 150. An AC switching power supply 152 is provided on the AC input terminal side, and the input terminal of the AC switching power supply 152 is the AC input terminal of the first switching power supply 150.

[0050] Furthermore, in the energy storage converter 100, the DC side 111 is provided with a DC connection terminal 114, and the DC input terminal of the first switching power supply 150 is connected to the DC connection terminal 114. The AC side 112 is provided with an AC connection terminal 115, and the AC input terminal of the first switching power supply 150 is connected to the AC connection terminal 115.

[0051] like Figure 2 As shown, a storage battery is also installed at the DC connection terminal 114. The BAT1+ terminal can be the positive terminal of storage battery BAT1, the BAT2+ terminal can be the positive terminal of storage battery BAT2, the BAT1- terminal can be the negative terminal of storage battery BAT1, and the BAT2- terminal can be the negative terminal of storage battery BAT2. The AC connection terminal 115 includes three-phase connection terminals for the external power grid, namely the R-phase connection terminal, the S-phase connection terminal, and the T-phase connection terminal, primarily for connecting three phases of AC voltage.

[0052] Based on this, in the first switching power supply 150, the positive terminal of the input of the DC switching power supply 151 can be connected to the BAT1+ and BAT2+ terminals through the DC connection terminal 114, and the negative terminal of the input of the DC switching power supply 151 can be connected to the BAT1- and BAT2- terminals through the DC connection terminal 114, thereby realizing the DC side connection. Similarly, in the first switching power supply 150, the first phase connection terminal of the input of the AC switching power supply 152 is connected to the R phase connection terminal of the AC connection terminal 115, the second phase connection terminal is connected to the S phase connection terminal, and the third phase connection terminal is connected to the T phase connection terminal.

[0053] Based on the above connection relationship, DC switching power supply 151 can convert the voltage of the energy storage battery into a suitable DC voltage to supply power to the pre-charging power supply 130, and AC switching power supply 152 can convert the voltage connected to the grid into a suitable DC voltage to supply power to the pre-charging power supply 130. When both are connected simultaneously, a mutual offset effect can occur. Particularly noteworthy is that when the energy storage converter 100 is operating, if both the DC voltage converted by DC switching power supply 151 and the DC voltage converted by AC switching power supply 152 are present, the DC voltage converted by AC switching power supply 152, being drawn from the grid side, is prone to power loss and has a poorer power supply effect compared to the DC voltage converted by DC switching power supply 151. Therefore, in this case, the DC voltage converted by DC switching power supply 151 is generally prioritized for mutual offset output to the pre-charging power supply.

[0054] In this way, by using the DC switching power supply 151 and AC switching power supply 152 in the first switching power supply 150 to introduce DC voltage and AC voltage respectively, through the mutual top effect of the two voltages, the first switching power supply 150 can convert the input DC voltage or AC voltage into a suitable DC voltage to supply power to the pre-charge power supply 130, so as to provide pre-charge voltage to the bus capacitor 113.

[0055] In some embodiments, the first switching power supply 150 further includes:

[0056] The first diode 163 has its anode connected to the output terminal of the DC switching power supply 151 and its cathode connected to the input terminal of the pre-charge power supply 130.

[0057] The second diode 164 has its anode connected to the output terminal of the AC switching power supply 152 and its cathode connected to the input terminal of the pre-charge power supply 130.

[0058] Specifically, please refer to Figure 2The first switching power supply 150 is provided with a first diode 163 and a second diode 164. The anode of the first diode 163 is connected to the output terminal of the DC switching power supply 151, and the cathode is connected to the input terminal of the pre-charge power supply 130 as the output terminal of the first switching power supply 150. The anode of the second diode 164 is connected to the output terminal of the AC switching power supply 152, and the cathode is also connected to the input terminal of the pre-charge power supply 130 as the output terminal of the first switching power supply 150.

[0059] The arrangement of the first diode 163 and the second diode 164 ensures that at any given time, only one of the DC switching power supply 151 and the AC switching power supply 152 supplies power to the pre-charge source 130, while the other does not supply power to the pre-charge source 130, thus avoiding reverse current conflicts.

[0060] For example, in some cases, when the difference between the voltage output by the DC switching power supply 151 and the forward conduction voltage of the first diode 163 is less than the difference between the voltage output by the AC switching power supply 152 and the forward conduction voltage of the second diode 164, the DC switching power supply 151 has a higher priority in supplying power to the pre-charge power supply 130 than the AC switching power supply 152.

[0061] Specifically, let the output voltage of the DC switching power supply be V3, the forward voltage of the first diode 163 be Vd3, the output voltage of the AC switching power supply be V4, and the forward voltage of the second diode 164 be Vd4. If the DC connection terminal 114 is connected to the energy storage battery and the AC connection terminal 115 is connected to the power grid, the DC switching power supply 151 can provide a voltage of V3-Vd3, and the AC power supply can provide a voltage of V4-Vd4. Since V3-Vd3 is greater than V4-Vd4, the first diode 163 is turned on, and the second diode 164 is turned off. The priority of the DC switching power supply 151 in supplying power to the pre-charge power supply 130 is higher than that of the AC switching power supply 152.

[0062] In some embodiments, the energy storage converter 100 further includes:

[0063] Power module 120;

[0064] The output terminal of the second switching power supply 140 and the pre-charging power supply 130 is also connected to the power consumption module 120 through the second switching power supply 140.

[0065] Furthermore, in some embodiments, the power module 120 includes a control submodule 121, the power port of which is connected to the output terminal of the first switching power supply 150 and the output terminal of the second switching power supply 150.

[0066] Specifically, please refer to Figure 1 as well as Figure 2The second switching power supply 140 is a power supply device that converts electrical energy using high-frequency switching devices, offering advantages such as high efficiency, small size, and stable output. The power consumption module 120 includes functional devices or components in the energy storage converter 100 that require electrical energy, such as control chips, sensors, and communication circuits. In the energy storage converter 100, the input terminal of the second switching power supply 140 is connected to the bus capacitor 113, and the output terminal of the second switching power supply 140 is connected to the power consumption module 120. The second switching power supply 140 can convert the input DC voltage into a DC voltage suitable for its internal circuitry to power the power consumption module 120, thereby providing a stable power supply to functional devices or components such as control chips, sensors, and communication circuits.

[0067] Furthermore, the power module 120 includes a control submodule 121. Generally, the control submodule 121 is a control chip. The function of the control submodule 121 is to perform logical control on the working status of functional devices or components such as sensors and communication circuits in the energy storage converter 100, so as to ensure that the working logic of each functional device or component of the energy storage converter 100 is correct, thereby ensuring the normal operation of the energy storage converter 100.

[0068] In some embodiments, the power module 120 further includes:

[0069] The anode of the third diode 161 is connected to the output terminal of the second switching power supply 140, and the cathode of the third diode 161 is connected to the power port of the control submodule 121.

[0070] The anode of the fourth diode 162 and the fourth diode 161 is connected to the output terminal of the first switching power supply 150, and the cathode of the fourth diode 161 is connected to the power port of the control submodule 121.

[0071] Specifically, the third diode 161 and the fourth diode 162 can ensure that one of the second switching power supply 140 and the first switching power supply 150 supplies power to the control submodule 121, preventing logic conflicts and avoiding reverse current conflicts.

[0072] For example, the voltage output by the second switching power supply 140 is less than the voltage output by the first switching power supply 150. Specifically, assuming that both the third diode 161 and the fourth diode 162 are ideal diodes, and assuming the voltage output by the second switching power supply 140 is V1 and the voltage output by the first switching power supply 150 is V2, after the pre-charging power supply 130 and the second switching power supply 140 are started, since V1 is less than V2, the third diode 161 is turned off and the fourth diode 162 is turned on. Therefore, the first switching power supply 150 has a higher priority in supplying power to the pre-charging power supply 130 than the second switching power supply 140.

[0073] When there is a forward voltage drop between the third diode 161 and the fourth diode 162, let the forward voltage of the third diode 161 be Vd1 and the forward voltage of the fourth diode 162 be Vd2. After the pre-charge power supply 130 and the second switching power supply 140 are started, the voltage supplied by the second switching power supply 140 to the control submodule 121 is V1-Vd1, and the voltage supplied by the first switching power supply 150 to the control submodule 121 is V2-Vd2. Since V1-Vd1 is less than V2-Vd2, the third diode 161 is cut off, and the fourth diode 162 is turned on. The first switching power supply 150 has a higher priority to supply power to the pre-charge power supply 130 than the second switching power supply 140.

[0074] In some embodiments, the power module 120 further includes a device submodule 123 and a heat dissipation submodule 122, which are connected to the output terminal of the second switching power supply 140.

[0075] Specifically, based on the above implementation, the power module 120 further includes a device submodule 123 and a heat dissipation submodule 122. The device submodule 123 generally includes functional devices or components of the energy storage converter 100, such as sensors and communication devices, as described in the above example. Figure 2 Power is supplied to the power semiconductor devices (such as IGBT devices, not shown). During the operation of the energy storage converter 100, the device submodule 123 generally draws power from the second switching power supply 140 to ensure the normal power supply of the aforementioned devices and components, thereby ensuring the normal operation of the energy storage converter 100. In addition, the heat dissipation submodule 122 provides... Figure 2 The cooling equipment, such as fans and water pumps (not shown), is powered to ensure that the equipment operates within a safe temperature range. During the operation of the energy storage converter 100, the heat dissipation submodule 122 typically draws power from the second switching power supply 140. The control submodule 121, heat dissipation submodule 122, and device submodule 123 work together to ensure that the energy storage converter 100 performs energy conversion efficiently and stably.

[0076] In some implementations, the control port of the precharge power supply 130 is connected to the control output port of the control submodule 121.

[0077] Specifically, based on the above implementation method, during the operation of the energy storage converter 100, the operating logic of the pre-charge power source 130 is controlled by the control submodule 121 in the power consumption module 120. Generally, the control port of the pre-charge power source 130 is connected to the control output port of the control submodule 121. The control submodule 121 uses the above connection relationship to control the operating logic of the pre-charge power source 130 by sending control signals to the pre-charge power source 130, so as to ensure that the charging process of the pre-charge power source 130 and the power supply process to the bus capacitor 113 operate correctly.

[0078] For example, when the energy storage converter 100 is powered on, the DC connection terminal 114 is connected to the energy storage battery or the AC connection terminal 115 is connected to the power grid. The first switching power supply 150 is connected to the control submodule 121 to ensure that the control chip of the pre-charging power supply 130 is powered on. At this time, the control port of the pre-charging power supply 130 is kept connected to the control port of the control submodule 121 so that the control submodule 121 provides a control signal to the pre-charging power supply 130 to start the pre-charging power supply 130. After the pre-charging power supply 130 is started, the first switching power supply 150 can charge the bus capacitor 113 through the pre-charging power supply 130.

[0079] In some embodiments, the energy storage converter 100 further includes a positive contactor and a negative contactor, the positive contactor being connected to the positive terminal of the DC side 111 and the negative contactor being connected to the negative terminal of the DC side 111.

[0080] In some implementations, please refer to [the relevant documentation]. Figure 2 The energy storage converter 100 also includes positive contactor 1, positive contactor 2, negative contactor 1, and negative contactor 2. The BAT1+ terminal can be connected to the positive terminal of the DC side 111 via positive contactor 1, and the BAT2+ terminal can be connected to the positive terminal of the DC side 111 via positive contactor 2. The BAT1- terminal can be connected to the negative terminal of the DC side 111 via positive contactor 1, and the BAT2- terminal can be connected to the negative terminal of the DC side 111 via positive contactor 2. The main function of the positive and negative contactors is to control whether the energy storage battery on the DC side 111 is connected, thereby enabling the energy storage converter 100 to start slowly based on the charging state of the bus capacitor 113, in conjunction with the first switching power supply 150 and the pre-charge power supply 130. When the charging state of the bus capacitor 113 meets the requirements, it switches to normal operation, allowing the energy storage battery on the DC side 111 to directly supply power to the bus capacitor 113.

[0081] For example, when the voltage of the bus capacitor 113 is less than the sum of the voltages of the energy storage batteries BAT1 and BAT2, the positive contactors 1, 2, 1, and 2 are disconnected. At this time, the first switching power supply 150 and the pre-charge power supply 130 perform a soft start of the energy storage converter 100 to prevent the energy storage batteries from directly supplying power to the bus capacitor 113. When the voltage of the bus capacitor 113 reaches the sum of the voltages of the energy storage batteries BAT1 and BAT2, the positive contactors 1, 2, 1, and 2 are closed, and the energy storage converter 100 enters its normal operating state.

[0082] In addition, in some embodiments, the energy storage converter 100 may include a filter circuit, and the AC side 112 of the converter can be connected to the power grid through the filter circuit.

[0083] The filter circuit can include a resonant network composed of inductors (L) and capacitors (C), which can significantly reduce the switching losses of power devices and improve overall efficiency under high-frequency switching by utilizing soft-switching technology. Simultaneously, the filter circuit can suppress high-frequency harmonics in voltage or current waveforms, reduce electromagnetic interference, ensure that the output power quality meets grid connection standards, and adapt to a wide input voltage range. This enhances the converter's compatibility with battery charging and discharging voltage fluctuations, thereby achieving a stable bidirectional energy flow with high power density and low losses in the energy storage system.

[0084] This application also provides an energy storage system, which includes the energy storage converter 100 of any of the above embodiments, and will not be described again here.

[0085] In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples.

[0086] Furthermore, the term "connection" should be interpreted broadly. For example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium; and it can also include internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0087] Furthermore, 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0089] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An energy storage converter, characterized by, The energy storage converter includes: Converter circuit, including DC side and AC side; The bus capacitor is connected in parallel to the DC side; A pre-charging power source, the output terminal of which is connected to the bus capacitor; A first switching power supply, wherein the DC input terminal of the first switching power supply is connected to the DC side, the AC input terminal of the first switching power supply is connected to the AC side, and the output terminal of the first switching power supply is connected to the input terminal of the pre-charge power supply.

2. The energy storage converter of claim 1, wherein, The first switching power supply includes: A DC switching power supply, wherein the input terminal of the DC switching power supply is connected to the DC side, and the output terminal of the DC switching power supply is connected to the input terminal of the pre-charge power supply; An AC switching power supply, wherein the input terminal of the AC switching power supply is connected to the AC side, and the output terminal of the AC switching power supply is connected to the input terminal of the pre-charge power supply.

3. The energy storage converter of claim 2, wherein, The first switching power supply further includes: A first diode, the anode of which is connected to the output terminal of the DC switching power supply, and the cathode of which is connected to the input terminal of the pre-charge power supply; The second diode has its anode connected to the output terminal of the AC switching power supply and its cathode connected to the input terminal of the pre-charge power supply.

4. The energy storage converter of any one of claims 1-3, wherein, The energy storage converter also includes: Power supply module; The output terminal of the pre-charge power supply is also connected to the power consumption module through the second switching power supply.

5. The energy storage converter of claim 4, wherein, The power module includes a control submodule, and the power port of the control submodule is connected to the output terminal of the first switching power supply and the output terminal of the second switching power supply.

6. The energy storage converter according to claim 5, characterized in that, The power module also includes: The third diode has its anode connected to the output terminal of the second switching power supply and its cathode connected to the power port of the control submodule. The fourth diode has its anode connected to the output terminal of the first switching power supply, and its cathode connected to the power port of the control submodule.

7. The energy storage converter of claim 5, wherein, The power module also includes a device submodule and a heat dissipation submodule, which are connected to the output terminal of the second switching power supply.

8. The energy storage converter of claim 5 or 6, wherein, The control port of the pre-charge power supply is connected to the control output port of the control submodule.

9. The energy storage converter of any one of claims 1-3, wherein, The energy storage converter also includes a positive contactor and a negative contactor, wherein the positive contactor is connected to the positive terminal of the DC side and the negative contactor is connected to the negative terminal of the DC side.

10. An energy storage system characterized by, The energy storage system includes the energy storage converter as described in any one of claims 1-9.

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