Power conversion system having wide direct-current voltage range, control method and apparatuses therefor, and medium

Abstract

The present application relates to the technical field of converter control. Provided are a power conversion system having a wide direct-current voltage range, a control method and apparatuses therefor, and a medium. The power conversion system having a wide direct-current voltage range comprises a first connecting end and a second connecting end, the first connecting end being connected to a direct-current power supply, and the second connecting end being connected to an alternating-current power supply; a semiconductor assembly, the semiconductor assembly being connected to the first connecting end, and the semiconductor assembly being used for adjusting a voltage transformation ratio between the direct-current power supply and the alternating-current power supply; an inductance assembly, the inductance assembly being connected to the semiconductor assembly, and the inductance assembly being used for storing the electric energy of the direct-current power supply and the alternating-current power supply; and a converter circuit, one end of the converter circuit being connected to the inductance assembly, the other end of the converter circuit being connected to the second connecting end, and the converter circuit being used for converting direct-current electricity into alternating-current electricity or converting alternating-current electricity into direct-current electricity.

Description

Wide DC voltage range energy storage converter and control method, device and medium thereof

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 16, 2023, with application number "202311031066.2" and application name "Wide DC voltage range energy storage converter and its control method, device and medium", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of converter control technology, and in particular to a wide DC voltage range energy storage converter and a control method, device, and medium thereof. Background Art

[0003] An energy storage system is a system that stores electrical energy through a power supply. The energy storage system includes multiple DC power supplies and stores the batteries of the AC power grid in the DC power supply. Therefore, an inverter is required inside the energy storage system to convert the current between the DC power supply and the AC power grid. However, the current inverters have problems such as a small voltage range and low conversion efficiency.

[0004] Summary of the Invention

[0005] The present application aims to at least solve the technical problems existing in the prior art or related art, such as the small voltage range of the converter and the low conversion efficiency.

[0006] To this end, a first aspect of the present application is to propose a wide DC voltage range energy storage converter.

[0007] A second aspect of the present application is to propose a control method for a wide DC voltage range energy storage converter.

[0008] The third aspect of the present application is to provide a control device for an energy storage converter with a wide DC voltage range.

[0009] The fourth aspect of the present application is to propose another control device for a wide DC voltage range energy storage converter.

[0010] A fifth aspect of the present application is to provide a readable storage medium.

[0011] In view of this, according to the first aspect of the present application, a wide DC voltage range energy storage converter is proposed, which is used to convert current between a DC power supply and an AC power supply. The wide DC voltage range energy storage converter includes: a first connection end and a second connection end, the first connection end is used to connect a DC power supply, and the second connection end is used to connect an AC power supply; a semiconductor component, the semiconductor component is connected to the first connection end, and the semiconductor component is used to adjust the transformation coefficient between the DC power supply and the AC power supply; an inductor component, the inductor component is connected to the semiconductor component, and the inductor component is used to store electrical energy of the DC power supply and the AC power supply; a converter circuit, one end of the converter circuit is connected to the inductor component, and the other end of the converter circuit is connected to the second connection end, and the converter circuit is used to convert DC power into AC power or convert AC power into DC power.

[0012] The wide DC voltage range energy storage converter in this technical solution includes a semiconductor component, which is used to adjust the transformation coefficient between the DC power supply and the AC power supply. It also includes a conversion circuit, which is used to convert DC power into AC power or convert AC power into DC power. The voltage range of the wide DC voltage range energy storage converter is expanded by the semiconductor component, the application scope of the wide DC voltage range energy storage converter is expanded, and the state conversion efficiency of the wide DC voltage range energy storage converter is improved.

[0013] According to the second aspect of the present application, a control method for a wide DC voltage range energy storage converter is proposed. The wide DC voltage range energy storage converter is the wide DC voltage range energy storage converter in any of the above technical solutions. The wide DC voltage range energy storage converter is used in an energy storage system. The energy storage system includes a DC power supply, an AC power supply and a wide DC voltage range energy storage converter. The wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply, respectively. The control method for the wide DC voltage range energy storage converter includes: obtaining a first transformation coefficient between the DC power supply and the AC power supply; obtaining a component temperature of a semiconductor component in the wide DC voltage range energy storage converter, and adjusting the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature.

[0014] The control method of the wide DC voltage range energy storage converter in the present technical solution adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature of the semiconductor component, thereby ensuring the operating performance of the wide DC voltage range energy storage converter and expanding the application range of the wide DC voltage range energy storage converter.

[0015] According to the third aspect of the present application, a control device for a wide DC voltage range energy storage converter is proposed. The wide DC voltage range energy storage converter is the wide DC voltage range energy storage converter in any of the above-mentioned technical solutions. The wide DC voltage range energy storage converter is used for an energy storage system. The energy storage system includes a DC power supply, an AC power supply and a wide DC voltage range energy storage converter. The wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply, respectively. The control device for the wide DC voltage range energy storage converter includes: an acquisition module for acquiring a first transformation coefficient between the DC power supply and the AC power supply; a control module for acquiring a component temperature of a semiconductor component in the wide DC voltage range energy storage converter, and adjusting the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature.

[0016] The control device of the wide DC voltage range energy storage converter in the present technical solution adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature of the semiconductor component, thereby ensuring the operating performance of the wide DC voltage range energy storage converter and expanding the application range of the wide DC voltage range energy storage converter.

[0017] According to a fourth aspect of the present application, a control device for a wide DC voltage range energy storage converter is provided, comprising a processor and a memory, wherein the memory stores a program or instruction. When executed by the processor, the program or instruction implements the steps of the control method for a wide DC voltage range energy storage converter as described in any of the above technical solutions. Therefore, the control device for a wide DC voltage range energy storage converter has all the beneficial effects of the control method for a wide DC voltage range energy storage converter as described in any of the above technical solutions, and no further details are given here.

[0018] According to a fifth aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored. When executed by a processor, the program or instruction implements the control method for a wide DC voltage range energy storage converter as described in any of the above technical solutions. Therefore, the readable storage medium has all the beneficial effects of the control method for a wide DC voltage range energy storage converter as described in any of the above technical solutions, and no further description is given here.

[0019] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] FIG1 shows one of the circuit diagrams of a wide DC voltage range energy storage converter in an embodiment of the present application;

[0022] FIG2 shows a second circuit diagram of a wide DC voltage range energy storage converter in an embodiment of the present application;

[0023] FIG3 shows one of the flow charts of a control method for a wide DC voltage range energy storage converter in an embodiment of the present application;

[0024] FIG4 shows a second flow chart of a control method for a wide DC voltage range energy storage converter in an embodiment of the present application;

[0025] FIG5 shows a third flow chart of a control method for a wide DC voltage range energy storage converter in an embodiment of the present application;

[0026] FIG6 shows one of the structural block diagrams of the control device for the wide DC voltage range energy storage converter in an embodiment of the present application;

[0027] FIG7 shows one of the schematic diagrams of the control device of the wide DC voltage range energy storage converter in the embodiment of the present application;

[0028] FIG8 shows a second schematic diagram of the control device for the energy storage converter with a wide DC voltage range in an embodiment of the present application;

[0029] FIG9 shows a second structural block diagram of the control device for the wide DC voltage range energy storage converter in an embodiment of the present application;

[0030] 1 and 2 , the correspondence between the reference numerals and component names is as follows: 100 wide DC voltage range energy storage converter, 101 first connection terminal, 102 second connection terminal, 103 semiconductor component, 104 inductor component, 105 converter circuit, 1031 first semiconductor device, 1032 second semiconductor device, 1033 first insulated gate transistor, 1034 second insulated gate transistor, 1035 first diode, 1036 second diode, 1037 third insulated gate transistor, 1038 fourth insulated gate transistor, 1039 third diode, 1040 fourth diode, 1041 first inductor, 1042 second inductor, 106 capacitor component, 1061 first capacitor, 1062 second capacitor, 1063 third capacitor, 1064 fourth capacitor. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0033] 1 to 9 , the wide DC voltage range energy storage converter and its control method, device, and medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0034] As shown in FIG1 , an embodiment of the present application provides a wide DC voltage range energy storage converter 100 , which includes:

[0035] A first connection terminal 101 and a second connection terminal 102, wherein the first connection terminal 101 is used to connect to a DC power source, and the second connection terminal 102 is used to connect to an AC power source;

[0036] A semiconductor component 103, connected to the first connection terminal 101, and used to adjust the transformation coefficient between the DC power supply and the AC power supply;

[0037] The inductor component 104 is connected to the semiconductor component 103 and is used to store electrical energy from the DC power supply and the AC power supply;

[0038] The converter circuit 105 has one end connected to the inductor component 104 and the other end connected to the second connection end 102. The converter circuit 105 is used to convert direct current into alternating current or convert alternating current into direct current.

[0039] In this embodiment, a wide DC voltage range energy storage converter 100 is provided, wherein the wide DC voltage range energy storage converter 100 is used to convert current between a DC power supply and an AC power supply, where the DC power supply is a power supply that uses direct current, and the AC power supply is a power supply that uses alternating current.

[0040] Exemplarily, the AC power source may be an AC power grid.

[0041] The wide DC voltage range energy storage converter 100 includes a first connection terminal 101 and a second connection terminal 102 . The first connection terminal 101 is used to connect to a port of a DC power source, and the second connection terminal 102 is used to connect to a port of an AC power source.

[0042] Exemplarily, when the first connection terminal 101 serves as an input terminal and the second connection terminal 102 serves as an output terminal, the DC power supply discharges to the AC power supply.

[0043] Exemplarily, when the first connection terminal 101 serves as an output terminal and the second connection terminal 102 serves as an input terminal, the AC power supply charges the DC power supply.

[0044] The wide DC voltage range energy storage converter 100 includes a semiconductor component 103, which is connected to the first connection terminal 101. The semiconductor component 103 is used to adjust the transformation coefficient between the DC power supply and the AC power supply. The transformation coefficient is used to adjust the voltage difference between the DC power supply and the AC power supply.

[0045] For example, the semiconductor component 103 may include a plurality of IGBTs (Insulated Gate Bipolar Transistors), and the transformation coefficient between the DC power supply and the AC power supply may be adjusted by changing the conduction time of the IGBTs.

[0046] It should be noted that the semiconductor component 103 is a device that can be controlled to be on and off, and the state switching time of the semiconductor component 103 is relatively fast, thereby ensuring the state switching speed of the energy storage converter 100 with a wide DC voltage range. For example, the state switching time of the semiconductor component 103 can be specifically 5ms to 10ms.

[0047] The wide DC voltage range energy storage converter 100 includes an inductor component 104 . The inductor component 104 is connected to a semiconductor component 103 . The inductor component 104 is used to store electrical energy from a DC power source and an AC power source.

[0048] Exemplarily, the inductor assembly 104 may include two inductors.

[0049] The wide DC voltage range energy storage converter 100 further includes a converter circuit 105 , one end of which is connected to the inductor component 104 , and the other end of the converter circuit 105 is connected to the second connection end 102 . The converter circuit 105 is used to convert DC power into AC power or convert AC power into DC power.

[0050] Exemplarily, when the first connection terminal 101 serves as an input terminal and the second connection terminal 102 serves as an output terminal, the converter circuit 105 is used to convert direct current into alternating current.

[0051] Exemplarily, when the first connection terminal 101 serves as an output terminal and the second connection terminal 102 serves as an input terminal, the converter circuit 105 is used to convert alternating current into direct current.

[0052] Exemplarily, the circuit structure of the current conversion circuit 105 may be as shown in FIG. 2 .

[0053] The wide DC voltage range energy storage converter 100 in this embodiment includes a semiconductor component 103, which is used to adjust the transformation coefficient between the DC power supply and the AC power supply, and also includes a converter circuit 105, which is used to convert DC power into AC power or convert AC power into DC power. The voltage range of the wide DC voltage range energy storage converter 100 is expanded by the semiconductor component 103, the application scope of the wide DC voltage range energy storage converter 100 is expanded, and the state conversion efficiency of the wide DC voltage range energy storage converter 100 is improved.

[0054] In some embodiments, optionally, the semiconductor component 103 includes a first semiconductor device 1031 and a second semiconductor device 1032 ;

[0055] In the case where the transformation coefficient is a step-down coefficient, when the first semiconductor device 1031 is in the on state, the semiconductor component 103 is used to conduct electricity between the first connection terminal 101 and the converter circuit 105; when the first semiconductor device 1031 is in the off state, the semiconductor component 103 is used to conduct electricity between the second semiconductor device 1032 and the converter circuit 105. The step-down coefficient is a coefficient determined according to the ratio of the time lengths that the first semiconductor device 1031 is in the on state and the time lengths that the first semiconductor device 1031 is in the off state.

[0056] When the transformation coefficient is a boost coefficient, when the second semiconductor device 1032 is in the on state, the semiconductor component 103 is used to turn on the conversion circuit 105 and the second semiconductor device 1032; when the second semiconductor device 1032 is in the off state, the semiconductor component 103 is used to turn on the conversion circuit 105 and the first connection terminal 101; the boost coefficient is a coefficient determined according to the ratio of the time length that the second semiconductor device 1032 is in the on state and the off state.

[0057] In this embodiment, the semiconductor component 103 includes a first semiconductor device 1031 and a second semiconductor device 1032 , wherein the first semiconductor device 1031 and the second semiconductor device 1032 are semiconductor devices capable of being controlled to be on or off.

[0058] When the transformation coefficient is the step-down coefficient, it means that the voltage of the first connection terminal 101 is greater than the voltage of the second connection terminal 102. When the first semiconductor device 1031 is in the on state, the semiconductor component 103 is used to connect the first connection terminal 101 and the conversion circuit 105. When the first semiconductor device 1031 is in the off state, the semiconductor component 103 is used to connect the second semiconductor device 1032 and the conversion circuit 105. The step-down coefficient is a coefficient determined according to the ratio of the time length when the first semiconductor device 1031 is in the on state and the off state.

[0059] For example, during the process of discharging the DC power supply to the AC power supply, the voltage of the DC power supply continues to decrease, and the wide DC voltage range energy storage converter 100 continues to adjust the voltage reduction coefficient according to the voltage of the DC power supply.

[0060] When the transformation coefficient is the boost coefficient, it means that the voltage of the first connection terminal 101 is less than the voltage of the second connection terminal 102. When the second semiconductor device 1032 is in the on state, the semiconductor component 103 is used to turn on the converter circuit 105 and the second semiconductor device 1032. When the second semiconductor device 1032 is in the off state, the semiconductor component 103 is used to turn on the converter circuit 105 and the first connection terminal 101. The boost coefficient is a coefficient determined according to the ratio of the time length when the second semiconductor device 1032 is in the on state and the off state.

[0061] For example, during the process of charging the DC power supply from the AC power supply, the voltage of the DC power supply continues to increase, and the wide DC voltage range energy storage converter 100 continues to adjust the boost coefficient according to the voltage of the DC power supply.

[0062] The semiconductor component 103 in the wide DC voltage range energy storage converter 100 in this embodiment includes a first semiconductor device 1031 and a second semiconductor device 1032. The step-down coefficient is determined based on the ratio of the time lengths when the first semiconductor device 1031 is in the on state and the off state, and the step-up coefficient is determined based on the ratio of the time lengths when the second semiconductor device 1032 is in the on state and the off state. This expands the application scope of the wide DC voltage range energy storage converter 100 and improves the state conversion efficiency of the wide DC voltage range energy storage converter 100.

[0063] In some embodiments, optionally, the first semiconductor device 1031 includes a first insulated gate transistor 1033, a second insulated gate transistor 1034, a first diode 1035, and a second diode 1036, wherein the collector of the first insulated gate transistor 1033 is connected to the anode of the first connection terminal 101, the emitter of the second insulated gate transistor 1034 is connected to the cathode of the first connection terminal 101, the first diode 1035 and the first insulated gate transistor 1033 are connected in anti-parallel, and the second diode 1036 and the second insulated gate transistor 1034 are connected in anti-parallel.

[0064] The second semiconductor device 1032 includes a third insulated gate transistor 1037, a fourth insulated gate transistor 1038, a third diode 1039 and a fourth diode 1040, the collector of the third insulated gate transistor 1037 is connected to the emitter of the first insulated gate transistor 1033, the emitter of the fourth insulated gate transistor 1038 is connected to the collector of the second insulated gate transistor 1034, the emitter of the third insulated gate transistor 1037 is connected to the collector of the fourth insulated gate transistor 1038, the third diode 1039 and the third insulated gate transistor 1037 are connected in anti-parallel, and the fourth diode 1040 and the fourth insulated gate transistor 1038 are connected in anti-parallel.

[0065] In this embodiment, the first semiconductor device 1031 includes a first insulated gate transistor 1033, a second insulated gate transistor 1034, a first diode 1035 and a second diode 1036, the collector of the first insulated gate transistor 1033 is connected to the anode of the first connection terminal 101, the emitter of the second insulated gate transistor 1034 is connected to the cathode of the first connection terminal 101, the anode of the first diode 1035 is connected to the emitter of the first insulated gate transistor 1033, the cathode of the first diode 1035 is connected to the collector of the first insulated gate transistor 1033, the anode of the second diode 1036 is connected to the emitter of the second insulated gate transistor 1034, and the cathode of the second diode 1036 is connected to the collector of the second insulated gate transistor 1034.

[0066] For example, the first insulated gate transistor 1033 and the second insulated gate transistor 1034 may be specifically IGBTs.

[0067] The second semiconductor device 1032 includes a third insulated gate transistor 1037, a fourth insulated gate transistor 1038, a third diode 1039 and a fourth diode 1040. The collector of the third insulated gate transistor 1037 is connected to the emitter of the first insulated gate transistor 1033, the emitter of the fourth insulated gate transistor 1038 is connected to the collector of the second insulated gate transistor 1034, the emitter of the third insulated gate transistor 1037 is connected to the collector of the fourth insulated gate transistor 1038, the anode of the third diode 1039 is connected to the emitter of the third insulated gate transistor 1037, the cathode of the third diode 1039 is connected to the collector of the third insulated gate transistor 1037, the anode of the fourth diode 1040 is connected to the emitter of the fourth insulated gate transistor 1038, and the cathode of the fourth diode 1040 is connected to the collector of the fourth insulated gate transistor 1038.

[0068] For example, the third insulated gate transistor 1037 and the fourth insulated gate transistor 1038 may be specifically IGBTs.

[0069] In the wide DC voltage range energy storage converter 100 in this embodiment, the first semiconductor device 1031 includes a first insulated gate transistor 1033, a second insulated gate transistor 1034, a first diode 1035 and a second diode 1036, and the second semiconductor device 1032 includes a third insulated gate transistor 1037, a fourth insulated gate transistor 1038, a third diode 1039 and a fourth diode 1040, thereby improving the state conversion efficiency of the wide DC voltage range energy storage converter 100, simplifying the circuit structure of the wide DC voltage range energy storage converter 100, and reducing the cost of the wide DC voltage range energy storage converter 100.

[0070] In some embodiments, optionally, the wide DC voltage range energy storage converter 100 further includes:

[0071] Capacitor assembly 106 , which is connected to inductor assembly 104 . Capacitor assembly 106 is used to filter and reduce noise on the DC power supply. Capacitor assembly 106 includes a first capacitor 1061 and a second capacitor 1062 .

[0072] The inductor component 104 includes a first inductor 1041 and a second inductor 1042;

[0073] One end of the first inductor 1041 is connected to the semiconductor component 103, the other end of the first inductor 1041 is connected to one end of the first capacitor 1061, the other end of the first capacitor 1061 is connected to one end of the second capacitor 1062, the other end of the second capacitor 1062 is connected to one end of the second inductor 1042, and the other end of the second inductor 1042 is connected to the semiconductor component 103.

[0074] In this embodiment, the wide DC voltage range energy storage converter 100 further includes a capacitor component 106, which is connected to the inductor component 104. The capacitor component 106 is used to filter and reduce noise on the DC power supply. The capacitor component 106 includes a first capacitor 1061 and a second capacitor 1062, and the inductor component 104 includes a first inductor 1041 and a second inductor 1042.

[0075] Specifically, one end of the first inductor 1041 is connected to the semiconductor component 103, the other end of the first inductor 1041 is connected to one end of the first capacitor 1061, the other end of the first capacitor 1061 is connected to one end of the second capacitor 1062, the other end of the second capacitor 1062 is connected to one end of the second inductor 1042, and the other end of the second inductor 1042 is connected to the semiconductor component 103.

[0076] Exemplarily, the wide DC voltage range energy storage converter 100 also includes a third capacitor 1063 and a fourth capacitor 1064, one end of the third capacitor 1063 is connected to the anode of the first connection terminal 101, the other end of the third capacitor 1063 is connected to one end of the fourth capacitor 1064, and the other end of the fourth capacitor 1064 is connected to the cathode of the first connection terminal 101.

[0077] Exemplarily, when the DC power supply discharges the AC power supply, when the first insulated gate transistor 1033 and the second insulated gate transistor 1034 are turned on and the third insulated gate transistor 1037 and the fourth insulated gate transistor 1038 are turned off, the first insulated gate transistor 1033, the second insulated gate transistor 1034, the first inductor 1041, the second inductor 1042 and the converter circuit 105 form a loop; when the first insulated gate transistor 1033 and the second insulated gate transistor 1034 are turned off and the third insulated gate transistor 1037 and the fourth insulated gate transistor 1038 are turned on, the third insulated gate transistor 1037, the fourth insulated gate transistor 1038, the first inductor 1041, the second inductor 1042 and the converter circuit 105 can form a loop.

[0078] Illustratively, when the AC power supply charges the DC power supply, the second connection terminal 102 is an input terminal, and the first capacitor 1061 , the second capacitor 1062 and the converter circuit 105 may form a loop.

[0079] It should be noted that the converter circuit 105 in the wide DC voltage range energy storage converter 100 does not need to be provided with a reactance device, which simplifies the circuit structure of the converter circuit 105 and further simplifies the structure of the wide DC voltage range energy storage converter 100.

[0080] The wide DC voltage range energy storage converter 100 in this embodiment further includes a capacitor component 106 , which includes a first capacitor 1061 and a second capacitor 1062 , and an inductor component 104 includes a first inductor 1041 and a second inductor 1042 , thereby simplifying the circuit structure of the converter circuit 105 and further simplifying the structure of the wide DC voltage range energy storage converter 100 .

[0081] The technical solution for the control method for a wide DC voltage range energy storage converter provided in this application can be implemented by a control device, which can also be determined based on actual usage requirements and is not specifically limited here. To more clearly describe the control method for a wide DC voltage range energy storage converter provided in this application, the following description uses the control device as the implementation entity.

[0082] As shown in FIG3 , an embodiment of the present application provides a control method for a wide DC voltage range energy storage converter. The control method for a wide DC voltage range energy storage converter includes:

[0083] Step 302: Obtain a first transformation coefficient between the DC power supply and the AC power supply;

[0084] Step 304 : Acquire the component temperature of the semiconductor component in the wide DC voltage range energy storage converter, and adjust the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature.

[0085] In this embodiment, a control method for a wide DC voltage range energy storage converter is provided, wherein the wide DC voltage range energy storage converter is the wide DC voltage range energy storage converter in the above embodiment, the wide DC voltage range energy storage converter is used in an energy storage system, the energy storage system is an electric energy system including a DC power supply, an AC power supply and a wide DC voltage range energy storage converter, and the wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply, respectively.

[0086] The control device obtains a first transformation coefficient between the DC power supply and the AC power supply, and obtains a component temperature of a semiconductor component in the wide DC voltage range energy storage converter, wherein the first transformation coefficient is a coefficient used to represent the voltage ratio between the DC power supply and the AC power supply, and the component temperature is the real-time temperature of the semiconductor component.

[0087] For example, the energy storage system may be a new energy power energy storage system.

[0088] Exemplarily, the voltage of the DC power supply is 1000 volts, the voltage of the AC power supply is 1200 volts, and the first transformation coefficient is 1.2.

[0089] The control device adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature, wherein the second transformation coefficient is the transformation coefficient of the wide DC voltage range energy storage converter.

[0090] It should be noted that semiconductor components will generate heat during operation, thereby increasing the temperature. However, excessively high temperature will affect the operating performance of the wide DC voltage range energy storage inverter. By adjusting the conduction time of the semiconductor components, the component temperature of the semiconductor components can be reduced, thereby ensuring the operating performance of the wide DC voltage range energy storage inverter.

[0091] The control method of the wide DC voltage range energy storage converter in this embodiment adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature of the semiconductor component, thereby ensuring the operating performance of the wide DC voltage range energy storage converter and expanding the application scope of the wide DC voltage range energy storage converter.

[0092] In some embodiments, optionally, as shown in FIG4 , a control method for a wide DC voltage range energy storage converter is proposed. The control method for a wide DC voltage range energy storage converter includes:

[0093] Step 402: Obtain a first transformation coefficient between the DC power supply and the AC power supply;

[0094] Step 404: Obtain the component temperature of the semiconductor component in the wide DC voltage range energy storage converter. When the DC power supply is in a charging state and the component temperature is greater than a temperature threshold of the semiconductor component, reduce the second transformation coefficient of the wide DC voltage range energy storage converter so that the second transformation coefficient is equal to the first transformation coefficient.

[0095] In this embodiment, when the DC power supply is in a charging state and the component temperature is greater than the temperature threshold of the semiconductor component, the control device reduces the second transformation coefficient of the wide DC voltage range energy storage converter by reducing the conduction time ratio of the semiconductor component so that the second transformation coefficient is equal to the first transformation coefficient, wherein the temperature threshold is a preset temperature for the semiconductor component.

[0096] For example, the temperature threshold may be 100 degrees Celsius.

[0097] Exemplarily, when the DC power supply is in a charging state and the component temperature is equal to the temperature threshold of the semiconductor component, it indicates that the second transformation coefficient of the wide DC voltage range energy storage converter is equal to the first transformation coefficient.

[0098] In the control method of the energy storage converter with a wide DC voltage range in this embodiment, when the DC power supply is in a charging state and the component temperature is greater than the temperature threshold of the semiconductor component, the second transformation coefficient is a step-down coefficient. By reducing the conduction time ratio of the semiconductor component, the second transformation coefficient of the energy storage converter with a wide DC voltage range is reduced so that the second transformation coefficient is equal to the first transformation coefficient, thereby ensuring the operating performance of the energy storage converter with a wide DC voltage range, and further ensuring the operating performance of the energy storage system.

[0099] In some embodiments, optionally, as shown in FIG5 , a control method for a wide DC voltage range energy storage converter is proposed. The control method for a wide DC voltage range energy storage converter includes:

[0100] Step 502: Obtain a first transformation coefficient between the DC power supply and the AC power supply;

[0101] Step 504: Obtain the component temperature of the semiconductor component in the wide DC voltage range energy storage converter. When the DC power supply is in a discharging state and the component temperature is greater than a temperature threshold of the semiconductor component, reduce the second transformation coefficient of the wide DC voltage range energy storage converter so that the second transformation coefficient is equal to the first transformation coefficient.

[0102] In this embodiment, when the DC power supply is in a discharging state and the component temperature is greater than the temperature threshold of the semiconductor component, the second transformation coefficient is the boost coefficient. The control device reduces the second transformation coefficient of the wide DC voltage range energy storage converter by reducing the conduction time ratio of the semiconductor component so that the second transformation coefficient is equal to the first transformation coefficient.

[0103] Exemplarily, when the DC power supply is in a discharging state and the component temperature is equal to the temperature threshold of the semiconductor component, it indicates that the second transformation coefficient of the wide DC voltage range energy storage converter is equal to the first transformation coefficient.

[0104] The control method for the energy storage converter with a wide DC voltage range in this embodiment reduces the second transformation coefficient of the energy storage converter with a wide DC voltage range by reducing the conduction time ratio of the semiconductor component when the DC power supply is in a discharging state and the component temperature is greater than the temperature threshold of the semiconductor component, so that the second transformation coefficient is equal to the first transformation coefficient, thereby ensuring the operating performance of the energy storage converter with a wide DC voltage range, and further ensuring the operating performance of the energy storage system.

[0105] As shown in FIG6 , an embodiment of the present application provides a control device 600 for a wide DC voltage range energy storage converter. The control device 600 for a wide DC voltage range energy storage converter includes:

[0106] An acquisition module 602 is configured to acquire a first transformation coefficient between a DC power supply and an AC power supply;

[0107] The control module 604 is configured to obtain the component temperature of the semiconductor component in the wide DC voltage range energy storage converter, and adjust the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature.

[0108] In this embodiment, a control device 600 for a wide DC voltage range energy storage converter is provided, wherein the wide DC voltage range energy storage converter is the wide DC voltage range energy storage converter in the above embodiment, and the wide DC voltage range energy storage converter is used in an energy storage system. The energy storage system is an electric energy system including a DC power supply, an AC power supply and a wide DC voltage range energy storage converter, and the wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply, respectively.

[0109] The acquisition module 602 obtains a first transformation coefficient between the DC power supply and the AC power supply, and obtains the component temperature of the semiconductor component in the wide DC voltage range energy storage converter, wherein the first transformation coefficient is a coefficient used to represent the voltage ratio between the DC power supply and the AC power supply, and the component temperature is the real-time temperature of the semiconductor component.

[0110] For example, the energy storage system may be a new energy power energy storage system.

[0111] Exemplarily, the voltage of the DC power supply is 1000 volts, the voltage of the AC power supply is 1200 volts, and the first transformation coefficient is 1.2.

[0112] The control module 604 adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature, wherein the second transformation coefficient is the transformation coefficient of the wide DC voltage range energy storage converter.

[0113] It should be noted that semiconductor components will generate heat during operation, thereby increasing the temperature. However, excessively high temperature will affect the operating performance of the wide DC voltage range energy storage inverter. By adjusting the conduction time of the semiconductor components, the component temperature of the semiconductor components can be reduced, thereby ensuring the operating performance of the wide DC voltage range energy storage inverter.

[0114] The control device 600 of the wide DC voltage range energy storage converter in this embodiment adjusts the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature of the semiconductor component, thereby ensuring the operating performance of the wide DC voltage range energy storage converter and expanding the application scope of the wide DC voltage range energy storage converter.

[0115] In some embodiments, optionally, the control device 600 for the wide DC voltage range energy storage converter further includes:

[0116] The control module 604 is further configured to reduce the second transformation coefficient of the wide DC voltage range energy storage converter so that the second transformation coefficient is equal to the first transformation coefficient when the DC power supply is in a charging state and the component temperature is greater than the temperature threshold of the semiconductor component.

[0117] In the control device 600 of the wide DC voltage range energy storage converter in this embodiment, when the DC power supply is in a charging state and the component temperature is greater than the temperature threshold of the semiconductor component, the second transformation coefficient is a step-down coefficient. By reducing the conduction time ratio of the semiconductor component, the second transformation coefficient of the wide DC voltage range energy storage converter is reduced so that the second transformation coefficient is equal to the first transformation coefficient, thereby ensuring the operating performance of the wide DC voltage range energy storage converter, and further ensuring the operating performance of the energy storage system.

[0118] In some embodiments, optionally, the control device 600 for the wide DC voltage range energy storage converter further includes:

[0119] The control module 604 is further configured to reduce the second transformation coefficient of the wide DC voltage range energy storage converter so that the second transformation coefficient is equal to the first transformation coefficient when the DC power supply is in a discharging state and the component temperature is greater than the temperature threshold of the semiconductor component.

[0120] For example, as shown in FIG7 , the wide DC voltage range energy storage converter includes a DC circuit inside. The DC power supply can be specifically an energy storage battery. When the energy storage battery is discharging, the energy storage battery voltage is initialized, and then the voltage reduction coefficient of the DC circuit is calculated, and then the voltage reduction coefficient of the DC circuit is adjusted. Then, it is determined whether the temperature rise of the IGBT in the DC circuit is too high. If the temperature rise of the IGBT in the DC circuit is too high, the voltage reduction coefficient of the DC circuit is adjusted. If the temperature rise of the IGBT in the DC circuit is not high, the battery is allowed to continue discharging.

[0121] For example, as shown in FIG8 , the DC wide voltage range energy storage converter includes a DC circuit inside, and the DC power source can be specifically an energy storage battery. When the energy storage battery is charging, the energy storage battery voltage is initialized, and then the voltage boost coefficient of the DC circuit is calculated, and then the voltage boost coefficient of the DC circuit is adjusted, and then it is judged whether the temperature rise of the IGBT in the DC circuit is too high. If the temperature rise of the IGBT in the DC circuit is too high, the voltage boost coefficient of the DC circuit is adjusted. If the temperature rise of the IGBT in the DC circuit is not high, the battery is allowed to continue charging.

[0122] In the present embodiment, when the DC power supply is in a discharging state and the component temperature is greater than the temperature threshold of the semiconductor component, the control device 600 of the wide DC voltage range energy storage converter reduces the second transformation coefficient of the wide DC voltage range energy storage converter by reducing the conduction time ratio of the semiconductor component so that the second transformation coefficient is equal to the first transformation coefficient, thereby ensuring the operating performance of the wide DC voltage range energy storage converter and, in turn, the operating performance of the energy storage system.

[0123] In some embodiments, optionally, as shown in FIG9 , a control device 900 for a wide DC voltage range energy storage converter is proposed. The control device 900 for a wide DC voltage range energy storage converter includes a processor 902 and a memory 904. The memory 904 stores a program or instruction. When the program or instruction is executed by the processor 902, the steps of the control method for a wide DC voltage range energy storage converter are implemented as described in any of the above technical solutions. Therefore, the control device 900 for a wide DC voltage range energy storage converter has all the beneficial effects of the control method for a wide DC voltage range energy storage converter described in any of the above technical solutions, and will not be further described here.

[0124] In some embodiments, optionally, a readable storage medium is provided on which a program is stored. When the program is executed by a processor, the control method of the wide DC voltage range energy storage converter in any of the above embodiments is implemented, thereby having all the beneficial technical effects of the control method of the wide DC voltage range energy storage converter in any of the above embodiments.

[0125] The readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0126] It should be clarified that in the claims, specification and drawings of this application, the term "plurality" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of more conveniently describing this application and making the description process simpler, and is not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limitations on this application. The terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0127] In the claims, specification, and drawings of this application, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In the claims, specification, and drawings of this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0128] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A wide DC voltage range energy storage converter, wherein: The wide DC voltage range energy storage converter is used to convert current between a DC power supply and an AC power supply, and the wide DC voltage range energy storage converter comprises: a first connection end and a second connection end, the first connection end being used to connect the DC power supply, and the second connection end being used to connect the AC power supply; A semiconductor component, the semiconductor component is connected to the first connection end, and the semiconductor component is used to adjust the transformation coefficient between the DC power supply and the AC power supply; an inductor component, the inductor component being connected to the semiconductor component, and the inductor component being used to store electrical energy of the DC power supply and the AC power supply; A converter circuit, one end of the converter circuit is connected to the inductor component, and the other end of the converter circuit is connected to the second connection end, and the converter circuit is used to convert direct current into alternating current or convert alternating current into direct current.

2. The wide DC voltage range energy storage converter according to claim 1, wherein: The semiconductor assembly includes a first semiconductor device and a second semiconductor device; In the case where the transformation coefficient is a step-down coefficient, when the first semiconductor device is in an on state, the semiconductor component is used to conduct the first connection terminal and the converter circuit, and when the first semiconductor device is in an off state, the semiconductor component is used to conduct the second semiconductor device and the converter circuit, and the step-down coefficient is a coefficient determined according to the ratio of the duration of the on state and the duration of the off state of the first semiconductor device; In the case where the transformation coefficient is a boost coefficient, when the second semiconductor device is in the on state, the semiconductor component is used to conduct the conversion circuit and the second semiconductor device, and when the second semiconductor device is in the off state, the semiconductor component is used to conduct the conversion circuit and the first connection end, and the boost coefficient is a coefficient determined according to the ratio of the time length when the second semiconductor device is in the on state and the off state.

3. The wide DC voltage range energy storage converter according to claim 2, wherein: The first semiconductor device includes a first insulated gate transistor, a second insulated gate transistor, a first diode and a second diode, the collector of the first insulated gate transistor and the anode of the first connection terminal The emitter of the second insulated gate transistor is connected to the cathode of the first connection end, the first diode and the first insulated gate transistor are connected in anti-parallel, and the second diode and the second insulated gate transistor are connected in anti-parallel; The second semiconductor device includes a third insulated gate transistor, a fourth insulated gate transistor, a third diode and a fourth diode, the collector of the third insulated gate transistor is connected to the emitter of the first insulated gate transistor, the emitter of the fourth insulated gate transistor is connected to the collector of the second insulated gate transistor, the emitter of the third insulated gate transistor is connected to the collector of the fourth insulated gate transistor, the third diode and the third insulated gate transistor are connected in anti-parallel, and the fourth diode and the fourth insulated gate transistor are connected in anti-parallel.

4. The wide DC voltage range energy storage converter according to any one of claims 1 to 3, wherein: The wide DC voltage range energy storage converter also includes: A capacitor component, the capacitor component is connected to the inductor component, the capacitor component is used to filter and reduce noise of the DC power supply, and the capacitor component includes a first capacitor and a second capacitor; The inductor assembly includes a first inductor and a second inductor; One end of the first inductor is connected to the semiconductor component, the other end of the first inductor is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the second inductor, and the other end of the second inductor is connected to the semiconductor component.

5. A control method for a wide DC voltage range energy storage converter, wherein: The wide DC voltage range energy storage converter is a wide DC voltage range energy storage converter according to any one of claims 1 to 4, and the wide DC voltage range energy storage converter is used in an energy storage system, and the energy storage system includes a DC power supply, an AC power supply and the wide DC voltage range energy storage converter, and the wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply respectively, and the control method of the wide DC voltage range energy storage converter includes: Acquire a first transformation coefficient between the DC power supply and the AC power supply; The component temperature of the semiconductor component in the wide DC voltage range energy storage converter is obtained, and according to the component temperature, the second transformation coefficient of the wide DC voltage range energy storage converter is adjusted to the first transformation coefficient.

6. The control method of the wide DC voltage range energy storage converter according to claim 5, wherein: The step of adjusting the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature includes: When the DC power supply is in a charging state and the component temperature is greater than a temperature threshold of the semiconductor component, the second transformation factor of the wide DC voltage range energy storage converter is reduced so that the second transformation factor is equal to the first transformation factor.

7. The control method of the wide DC voltage range energy storage converter according to claim 5, wherein: The step of adjusting the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature includes: When the DC power supply is in a discharging state and the component temperature is greater than a temperature threshold of the semiconductor component, the second transformation factor of the wide DC voltage range energy storage converter is reduced so that the second transformation factor is equal to the first transformation factor.

8. A control device for a wide DC voltage range energy storage converter, wherein: The wide DC voltage range energy storage converter is a wide DC voltage range energy storage converter according to any one of claims 1 to 4, and the wide DC voltage range energy storage converter is used in an energy storage system, and the energy storage system includes a DC power supply, an AC power supply and the wide DC voltage range energy storage converter, and the wide DC voltage range energy storage converter is connected to the DC power supply and the AC power supply respectively, and the control device of the wide DC voltage range energy storage converter includes: An acquisition module, used for acquiring a first transformation coefficient between the DC power supply and the AC power supply; The control module is used to obtain the component temperature of the semiconductor component in the wide DC voltage range energy storage converter, and adjust the second transformation coefficient of the wide DC voltage range energy storage converter to the first transformation coefficient according to the component temperature.

9. A control device for a wide DC voltage range energy storage converter, wherein: include: processor; A memory, wherein a program or instruction is stored in the memory, and when the processor executes the program or instruction in the memory, the steps of the control method of the wide DC voltage range energy storage converter as described in any one of claims 5 to 7 are implemented.

10. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the control method of the wide DC voltage range energy storage converter according to any one of claims 5 to 7 are implemented.

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